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linux-sg2042/drivers/char/vt.c

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
* linux/drivers/char/vt.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
/*
* Hopefully this will be a rather complete VT102 implementation.
*
* Beeping thanks to John T Kohl.
*
* Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
* Chars, and VT100 enhancements by Peter MacDonald.
*
* Copy and paste function by Andrew Haylett,
* some enhancements by Alessandro Rubini.
*
* Code to check for different video-cards mostly by Galen Hunt,
* <g-hunt@ee.utah.edu>
*
* Rudimentary ISO 10646/Unicode/UTF-8 character set support by
* Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
*
* Dynamic allocation of consoles, aeb@cwi.nl, May 1994
* Resizing of consoles, aeb, 940926
*
* Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
* <poe@daimi.aau.dk>
*
* User-defined bell sound, new setterm control sequences and printk
* redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
*
* APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
*
* Merge with the abstract console driver by Geert Uytterhoeven
* <geert@linux-m68k.org>, Jan 1997.
*
* Original m68k console driver modifications by
*
* - Arno Griffioen <arno@usn.nl>
* - David Carter <carter@cs.bris.ac.uk>
*
* The abstract console driver provides a generic interface for a text
* console. It supports VGA text mode, frame buffer based graphical consoles
* and special graphics processors that are only accessible through some
* registers (e.g. a TMS340x0 GSP).
*
* The interface to the hardware is specified using a special structure
* (struct consw) which contains function pointers to console operations
* (see <linux/console.h> for more information).
*
* Support for changeable cursor shape
* by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
*
* Ported to i386 and con_scrolldelta fixed
* by Emmanuel Marty <core@ggi-project.org>, April 1998
*
* Resurrected character buffers in videoram plus lots of other trickery
* by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
*
* Removed old-style timers, introduced console_timer, made timer
* deletion SMP-safe. 17Jun00, Andrew Morton <andrewm@uow.edu.au>
*
* Removed console_lock, enabled interrupts across all console operations
* 13 March 2001, Andrew Morton
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/kd.h>
#include <linux/slab.h>
#include <linux/major.h>
#include <linux/mm.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/vt_kern.h>
#include <linux/selection.h>
#include <linux/tiocl.h>
#include <linux/kbd_kern.h>
#include <linux/consolemap.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/bootmem.h>
#include <linux/pm.h>
#include <linux/font.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/uaccess.h>
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
#define MAX_NR_CON_DRIVER 16
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
#define CON_DRIVER_FLAG_MODULE 1
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
#define CON_DRIVER_FLAG_INIT 2
struct con_driver {
const struct consw *con;
const char *desc;
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
struct class_device *class_dev;
int node;
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
int first;
int last;
int flag;
};
static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
const struct consw *conswitchp;
/* A bitmap for codes <32. A bit of 1 indicates that the code
* corresponding to that bit number invokes some special action
* (such as cursor movement) and should not be displayed as a
* glyph unless the disp_ctrl mode is explicitly enabled.
*/
#define CTRL_ACTION 0x0d00ff81
#define CTRL_ALWAYS 0x0800f501 /* Cannot be overridden by disp_ctrl */
/*
* Here is the default bell parameters: 750HZ, 1/8th of a second
*/
#define DEFAULT_BELL_PITCH 750
#define DEFAULT_BELL_DURATION (HZ/8)
extern void vcs_make_devfs(struct tty_struct *tty);
extern void vcs_remove_devfs(struct tty_struct *tty);
extern void console_map_init(void);
#ifdef CONFIG_PROM_CONSOLE
extern void prom_con_init(void);
#endif
#ifdef CONFIG_MDA_CONSOLE
extern int mda_console_init(void);
#endif
struct vc vc_cons [MAX_NR_CONSOLES];
#ifndef VT_SINGLE_DRIVER
static const struct consw *con_driver_map[MAX_NR_CONSOLES];
#endif
static int con_open(struct tty_struct *, struct file *);
static void vc_init(struct vc_data *vc, unsigned int rows,
unsigned int cols, int do_clear);
static void gotoxy(struct vc_data *vc, int new_x, int new_y);
static void save_cur(struct vc_data *vc);
static void reset_terminal(struct vc_data *vc, int do_clear);
static void con_flush_chars(struct tty_struct *tty);
static void set_vesa_blanking(char __user *p);
static void set_cursor(struct vc_data *vc);
static void hide_cursor(struct vc_data *vc);
static void console_callback(void *ignored);
static void blank_screen_t(unsigned long dummy);
static void set_palette(struct vc_data *vc);
static int printable; /* Is console ready for printing? */
/*
* ignore_poke: don't unblank the screen when things are typed. This is
* mainly for the privacy of braille terminal users.
*/
static int ignore_poke;
int do_poke_blanked_console;
int console_blanked;
static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
static int blankinterval = 10*60*HZ;
static int vesa_off_interval;
static DECLARE_WORK(console_work, console_callback, NULL);
/*
* fg_console is the current virtual console,
* last_console is the last used one,
* want_console is the console we want to switch to,
* kmsg_redirect is the console for kernel messages,
*/
int fg_console;
int last_console;
int want_console = -1;
int kmsg_redirect;
/*
* For each existing display, we have a pointer to console currently visible
* on that display, allowing consoles other than fg_console to be refreshed
* appropriately. Unless the low-level driver supplies its own display_fg
* variable, we use this one for the "master display".
*/
static struct vc_data *master_display_fg;
/*
* Unfortunately, we need to delay tty echo when we're currently writing to the
* console since the code is (and always was) not re-entrant, so we schedule
* all flip requests to process context with schedule-task() and run it from
* console_callback().
*/
/*
* For the same reason, we defer scrollback to the console callback.
*/
static int scrollback_delta;
/*
* Hook so that the power management routines can (un)blank
* the console on our behalf.
*/
int (*console_blank_hook)(int);
static struct timer_list console_timer;
static int blank_state;
static int blank_timer_expired;
enum {
blank_off = 0,
blank_normal_wait,
blank_vesa_wait,
};
/*
* Low-Level Functions
*/
#define IS_FG(vc) ((vc)->vc_num == fg_console)
#ifdef VT_BUF_VRAM_ONLY
#define DO_UPDATE(vc) 0
#else
#define DO_UPDATE(vc) CON_IS_VISIBLE(vc)
#endif
static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
{
unsigned short *p;
if (!viewed)
p = (unsigned short *)(vc->vc_origin + offset);
else if (!vc->vc_sw->con_screen_pos)
p = (unsigned short *)(vc->vc_visible_origin + offset);
else
p = vc->vc_sw->con_screen_pos(vc, offset);
return p;
}
static inline void scrolldelta(int lines)
{
scrollback_delta += lines;
schedule_console_callback();
}
void schedule_console_callback(void)
{
schedule_work(&console_work);
}
static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
{
unsigned short *d, *s;
if (t+nr >= b)
nr = b - t - 1;
if (b > vc->vc_rows || t >= b || nr < 1)
return;
if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
return;
d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
vc->vc_size_row * nr);
}
static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
{
unsigned short *s;
unsigned int step;
if (t+nr >= b)
nr = b - t - 1;
if (b > vc->vc_rows || t >= b || nr < 1)
return;
if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
return;
s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
step = vc->vc_cols * nr;
scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
}
static void do_update_region(struct vc_data *vc, unsigned long start, int count)
{
#ifndef VT_BUF_VRAM_ONLY
unsigned int xx, yy, offset;
u16 *p;
p = (u16 *) start;
if (!vc->vc_sw->con_getxy) {
offset = (start - vc->vc_origin) / 2;
xx = offset % vc->vc_cols;
yy = offset / vc->vc_cols;
} else {
int nxx, nyy;
start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
xx = nxx; yy = nyy;
}
for(;;) {
u16 attrib = scr_readw(p) & 0xff00;
int startx = xx;
u16 *q = p;
while (xx < vc->vc_cols && count) {
if (attrib != (scr_readw(p) & 0xff00)) {
if (p > q)
vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
startx = xx;
q = p;
attrib = scr_readw(p) & 0xff00;
}
p++;
xx++;
count--;
}
if (p > q)
vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
if (!count)
break;
xx = 0;
yy++;
if (vc->vc_sw->con_getxy) {
p = (u16 *)start;
start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
}
}
#endif
}
void update_region(struct vc_data *vc, unsigned long start, int count)
{
WARN_CONSOLE_UNLOCKED();
if (DO_UPDATE(vc)) {
hide_cursor(vc);
do_update_region(vc, start, count);
set_cursor(vc);
}
}
/* Structure of attributes is hardware-dependent */
static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink, u8 _underline, u8 _reverse)
{
if (vc->vc_sw->con_build_attr)
return vc->vc_sw->con_build_attr(vc, _color, _intensity, _blink, _underline, _reverse);
#ifndef VT_BUF_VRAM_ONLY
/*
* ++roman: I completely changed the attribute format for monochrome
* mode (!can_do_color). The formerly used MDA (monochrome display
* adapter) format didn't allow the combination of certain effects.
* Now the attribute is just a bit vector:
* Bit 0..1: intensity (0..2)
* Bit 2 : underline
* Bit 3 : reverse
* Bit 7 : blink
*/
{
u8 a = vc->vc_color;
if (!vc->vc_can_do_color)
return _intensity |
(_underline ? 4 : 0) |
(_reverse ? 8 : 0) |
(_blink ? 0x80 : 0);
if (_underline)
a = (a & 0xf0) | vc->vc_ulcolor;
else if (_intensity == 0)
a = (a & 0xf0) | vc->vc_ulcolor;
if (_reverse)
a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
if (_blink)
a ^= 0x80;
if (_intensity == 2)
a ^= 0x08;
if (vc->vc_hi_font_mask == 0x100)
a <<= 1;
return a;
}
#else
return 0;
#endif
}
static void update_attr(struct vc_data *vc)
{
vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity, vc->vc_blink, vc->vc_underline, vc->vc_reverse ^ vc->vc_decscnm);
vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm) << 8) | ' ';
}
/* Note: inverting the screen twice should revert to the original state */
void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
{
unsigned short *p;
WARN_CONSOLE_UNLOCKED();
count /= 2;
p = screenpos(vc, offset, viewed);
if (vc->vc_sw->con_invert_region)
vc->vc_sw->con_invert_region(vc, p, count);
#ifndef VT_BUF_VRAM_ONLY
else {
u16 *q = p;
int cnt = count;
u16 a;
if (!vc->vc_can_do_color) {
while (cnt--) {
a = scr_readw(q);
a ^= 0x0800;
scr_writew(a, q);
q++;
}
} else if (vc->vc_hi_font_mask == 0x100) {
while (cnt--) {
a = scr_readw(q);
a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
scr_writew(a, q);
q++;
}
} else {
while (cnt--) {
a = scr_readw(q);
a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
scr_writew(a, q);
q++;
}
}
}
#endif
if (DO_UPDATE(vc))
do_update_region(vc, (unsigned long) p, count);
}
/* used by selection: complement pointer position */
void complement_pos(struct vc_data *vc, int offset)
{
[PATCH] vt: fix possible memory corruption in complement_pos Based on a patch from Andr Pereira de Almeida <andre@cachola.com.br> It might be possible for the saved pointer (*p) to become invalid in between vc_resizes, so saving the screen offset instead of the screen pointer is saner. This bug is very hard to trigger though, but Andre probably did, if he's submitting this patch. Anyway, with Andre's patch, it's still possible for the offsets to be still illegal, if the new screen size is smaller than the old one. So I've also added checks if the offsets are still within the screenbuffer size. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 06:17:52 +08:00
static int old_offset = -1;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
static unsigned short old;
static unsigned short oldx, oldy;
WARN_CONSOLE_UNLOCKED();
[PATCH] vt: fix possible memory corruption in complement_pos Based on a patch from Andr Pereira de Almeida <andre@cachola.com.br> It might be possible for the saved pointer (*p) to become invalid in between vc_resizes, so saving the screen offset instead of the screen pointer is saner. This bug is very hard to trigger though, but Andre probably did, if he's submitting this patch. Anyway, with Andre's patch, it's still possible for the offsets to be still illegal, if the new screen size is smaller than the old one. So I've also added checks if the offsets are still within the screenbuffer size. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 06:17:52 +08:00
if (old_offset != -1 && old_offset >= 0 &&
old_offset < vc->vc_screenbuf_size) {
scr_writew(old, screenpos(vc, old_offset, 1));
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (DO_UPDATE(vc))
vc->vc_sw->con_putc(vc, old, oldy, oldx);
}
[PATCH] vt: fix possible memory corruption in complement_pos Based on a patch from Andr Pereira de Almeida <andre@cachola.com.br> It might be possible for the saved pointer (*p) to become invalid in between vc_resizes, so saving the screen offset instead of the screen pointer is saner. This bug is very hard to trigger though, but Andre probably did, if he's submitting this patch. Anyway, with Andre's patch, it's still possible for the offsets to be still illegal, if the new screen size is smaller than the old one. So I've also added checks if the offsets are still within the screenbuffer size. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 06:17:52 +08:00
old_offset = offset;
if (offset != -1 && offset >= 0 &&
offset < vc->vc_screenbuf_size) {
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
unsigned short new;
[PATCH] vt: fix possible memory corruption in complement_pos Based on a patch from Andr Pereira de Almeida <andre@cachola.com.br> It might be possible for the saved pointer (*p) to become invalid in between vc_resizes, so saving the screen offset instead of the screen pointer is saner. This bug is very hard to trigger though, but Andre probably did, if he's submitting this patch. Anyway, with Andre's patch, it's still possible for the offsets to be still illegal, if the new screen size is smaller than the old one. So I've also added checks if the offsets are still within the screenbuffer size. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 06:17:52 +08:00
unsigned short *p;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
p = screenpos(vc, offset, 1);
old = scr_readw(p);
new = old ^ vc->vc_complement_mask;
scr_writew(new, p);
if (DO_UPDATE(vc)) {
oldx = (offset >> 1) % vc->vc_cols;
oldy = (offset >> 1) / vc->vc_cols;
vc->vc_sw->con_putc(vc, new, oldy, oldx);
}
}
[PATCH] vt: fix possible memory corruption in complement_pos Based on a patch from Andr Pereira de Almeida <andre@cachola.com.br> It might be possible for the saved pointer (*p) to become invalid in between vc_resizes, so saving the screen offset instead of the screen pointer is saner. This bug is very hard to trigger though, but Andre probably did, if he's submitting this patch. Anyway, with Andre's patch, it's still possible for the offsets to be still illegal, if the new screen size is smaller than the old one. So I've also added checks if the offsets are still within the screenbuffer size. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 06:17:52 +08:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
static void insert_char(struct vc_data *vc, unsigned int nr)
{
unsigned short *p, *q = (unsigned short *)vc->vc_pos;
p = q + vc->vc_cols - nr - vc->vc_x;
while (--p >= q)
scr_writew(scr_readw(p), p + nr);
scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
vc->vc_need_wrap = 0;
if (DO_UPDATE(vc)) {
unsigned short oldattr = vc->vc_attr;
vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
vc->vc_cols - vc->vc_x - nr);
vc->vc_attr = vc->vc_video_erase_char >> 8;
while (nr--)
vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
vc->vc_attr = oldattr;
}
}
static void delete_char(struct vc_data *vc, unsigned int nr)
{
unsigned int i = vc->vc_x;
unsigned short *p = (unsigned short *)vc->vc_pos;
while (++i <= vc->vc_cols - nr) {
scr_writew(scr_readw(p+nr), p);
p++;
}
scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
vc->vc_need_wrap = 0;
if (DO_UPDATE(vc)) {
unsigned short oldattr = vc->vc_attr;
vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
vc->vc_cols - vc->vc_x - nr);
vc->vc_attr = vc->vc_video_erase_char >> 8;
while (nr--)
vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
vc->vc_cols - 1 - nr);
vc->vc_attr = oldattr;
}
}
static int softcursor_original;
static void add_softcursor(struct vc_data *vc)
{
int i = scr_readw((u16 *) vc->vc_pos);
u32 type = vc->vc_cursor_type;
if (! (type & 0x10)) return;
if (softcursor_original != -1) return;
softcursor_original = i;
i |= ((type >> 8) & 0xff00 );
i ^= ((type) & 0xff00 );
if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
scr_writew(i, (u16 *) vc->vc_pos);
if (DO_UPDATE(vc))
vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
}
static void hide_softcursor(struct vc_data *vc)
{
if (softcursor_original != -1) {
scr_writew(softcursor_original, (u16 *)vc->vc_pos);
if (DO_UPDATE(vc))
vc->vc_sw->con_putc(vc, softcursor_original,
vc->vc_y, vc->vc_x);
softcursor_original = -1;
}
}
static void hide_cursor(struct vc_data *vc)
{
if (vc == sel_cons)
clear_selection();
vc->vc_sw->con_cursor(vc, CM_ERASE);
hide_softcursor(vc);
}
static void set_cursor(struct vc_data *vc)
{
if (!IS_FG(vc) || console_blanked ||
vc->vc_mode == KD_GRAPHICS)
return;
if (vc->vc_deccm) {
if (vc == sel_cons)
clear_selection();
add_softcursor(vc);
if ((vc->vc_cursor_type & 0x0f) != 1)
vc->vc_sw->con_cursor(vc, CM_DRAW);
} else
hide_cursor(vc);
}
static void set_origin(struct vc_data *vc)
{
WARN_CONSOLE_UNLOCKED();
if (!CON_IS_VISIBLE(vc) ||
!vc->vc_sw->con_set_origin ||
!vc->vc_sw->con_set_origin(vc))
vc->vc_origin = (unsigned long)vc->vc_screenbuf;
vc->vc_visible_origin = vc->vc_origin;
vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
}
static inline void save_screen(struct vc_data *vc)
{
WARN_CONSOLE_UNLOCKED();
if (vc->vc_sw->con_save_screen)
vc->vc_sw->con_save_screen(vc);
}
/*
* Redrawing of screen
*/
static void clear_buffer_attributes(struct vc_data *vc)
{
unsigned short *p = (unsigned short *)vc->vc_origin;
int count = vc->vc_screenbuf_size / 2;
int mask = vc->vc_hi_font_mask | 0xff;
for (; count > 0; count--, p++) {
scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
}
}
void redraw_screen(struct vc_data *vc, int is_switch)
{
int redraw = 0;
WARN_CONSOLE_UNLOCKED();
if (!vc) {
/* strange ... */
/* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
return;
}
if (is_switch) {
struct vc_data *old_vc = vc_cons[fg_console].d;
if (old_vc == vc)
return;
if (!CON_IS_VISIBLE(vc))
redraw = 1;
*vc->vc_display_fg = vc;
fg_console = vc->vc_num;
hide_cursor(old_vc);
if (!CON_IS_VISIBLE(old_vc)) {
save_screen(old_vc);
set_origin(old_vc);
}
} else {
hide_cursor(vc);
redraw = 1;
}
if (redraw) {
int update;
int old_was_color = vc->vc_can_do_color;
set_origin(vc);
update = vc->vc_sw->con_switch(vc);
set_palette(vc);
/*
* If console changed from mono<->color, the best we can do
* is to clear the buffer attributes. As it currently stands,
* rebuilding new attributes from the old buffer is not doable
* without overly complex code.
*/
if (old_was_color != vc->vc_can_do_color) {
update_attr(vc);
clear_buffer_attributes(vc);
}
if (update && vc->vc_mode != KD_GRAPHICS)
do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
}
set_cursor(vc);
if (is_switch) {
set_leds();
compute_shiftstate();
}
}
/*
* Allocation, freeing and resizing of VTs.
*/
int vc_cons_allocated(unsigned int i)
{
return (i < MAX_NR_CONSOLES && vc_cons[i].d);
}
static void visual_init(struct vc_data *vc, int num, int init)
{
/* ++Geert: vc->vc_sw->con_init determines console size */
if (vc->vc_sw)
module_put(vc->vc_sw->owner);
vc->vc_sw = conswitchp;
#ifndef VT_SINGLE_DRIVER
if (con_driver_map[num])
vc->vc_sw = con_driver_map[num];
#endif
__module_get(vc->vc_sw->owner);
vc->vc_num = num;
vc->vc_display_fg = &master_display_fg;
vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
vc->vc_uni_pagedir = 0;
vc->vc_hi_font_mask = 0;
vc->vc_complement_mask = 0;
vc->vc_can_do_color = 0;
vc->vc_sw->con_init(vc, init);
if (!vc->vc_complement_mask)
vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
vc->vc_s_complement_mask = vc->vc_complement_mask;
vc->vc_size_row = vc->vc_cols << 1;
vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
}
int vc_allocate(unsigned int currcons) /* return 0 on success */
{
WARN_CONSOLE_UNLOCKED();
if (currcons >= MAX_NR_CONSOLES)
return -ENXIO;
if (!vc_cons[currcons].d) {
struct vc_data *vc;
/* prevent users from taking too much memory */
if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
return -EPERM;
/* due to the granularity of kmalloc, we waste some memory here */
/* the alloc is done in two steps, to optimize the common situation
of a 25x80 console (structsize=216, screenbuf_size=4000) */
/* although the numbers above are not valid since long ago, the
point is still up-to-date and the comment still has its value
even if only as a historical artifact. --mj, July 1998 */
vc = kmalloc(sizeof(struct vc_data), GFP_KERNEL);
if (!vc)
return -ENOMEM;
memset(vc, 0, sizeof(*vc));
vc_cons[currcons].d = vc;
visual_init(vc, currcons, 1);
if (!*vc->vc_uni_pagedir_loc)
con_set_default_unimap(vc);
vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
if (!vc->vc_screenbuf) {
kfree(vc);
vc_cons[currcons].d = NULL;
return -ENOMEM;
}
vc->vc_kmalloced = 1;
vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
}
return 0;
}
static inline int resize_screen(struct vc_data *vc, int width, int height)
{
/* Resizes the resolution of the display adapater */
int err = 0;
if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
err = vc->vc_sw->con_resize(vc, width, height);
return err;
}
/*
* Change # of rows and columns (0 means unchanged/the size of fg_console)
* [this is to be used together with some user program
* like resize that changes the hardware videomode]
*/
#define VC_RESIZE_MAXCOL (32767)
#define VC_RESIZE_MAXROW (32767)
int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
{
unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
unsigned int old_cols, old_rows, old_row_size, old_screen_size;
unsigned int new_cols, new_rows, new_row_size, new_screen_size;
[PATCH] console: Fix buffer copy on vc resize On a vc resize, the contents of the old screen buffer are transferred to the new screenbuffer. If the new screenbuffer is smaller than the old one, only the contents from the bottom are copied to new. If the contents of the old buffer are located at the top, then the contents will not be copied to the new buffer resulting in a blank screen. This bug will happen only if the vc in question is not in the foreground. Doing an fbset -a or con2fbmap will trigger this bug. To fix this problem, base the start of the copy from the location of the current cursor. If the cursor is near the top of the buffer, copy the contents at the top, and if the cursor is near the bottom of the buffer, then copy the contents at the bottom. In the unlikely case where the new row size is greater than 2x smaller than the old one, and the cursor is in the middle, copy 1/2 screenful from the top and bottom of the cursor position. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-10 04:04:39 +08:00
unsigned int end;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
unsigned short *newscreen;
WARN_CONSOLE_UNLOCKED();
if (!vc)
return -ENXIO;
if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
return -EINVAL;
new_cols = (cols ? cols : vc->vc_cols);
new_rows = (lines ? lines : vc->vc_rows);
new_row_size = new_cols << 1;
new_screen_size = new_row_size * new_rows;
if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
return 0;
newscreen = (unsigned short *) kmalloc(new_screen_size, GFP_USER);
if (!newscreen)
return -ENOMEM;
old_rows = vc->vc_rows;
old_cols = vc->vc_cols;
old_row_size = vc->vc_size_row;
old_screen_size = vc->vc_screenbuf_size;
err = resize_screen(vc, new_cols, new_rows);
if (err) {
kfree(newscreen);
return err;
}
vc->vc_rows = new_rows;
vc->vc_cols = new_cols;
vc->vc_size_row = new_row_size;
vc->vc_screenbuf_size = new_screen_size;
rlth = min(old_row_size, new_row_size);
rrem = new_row_size - rlth;
old_origin = vc->vc_origin;
new_origin = (long) newscreen;
new_scr_end = new_origin + new_screen_size;
[PATCH] console: Fix buffer copy on vc resize On a vc resize, the contents of the old screen buffer are transferred to the new screenbuffer. If the new screenbuffer is smaller than the old one, only the contents from the bottom are copied to new. If the contents of the old buffer are located at the top, then the contents will not be copied to the new buffer resulting in a blank screen. This bug will happen only if the vc in question is not in the foreground. Doing an fbset -a or con2fbmap will trigger this bug. To fix this problem, base the start of the copy from the location of the current cursor. If the cursor is near the top of the buffer, copy the contents at the top, and if the cursor is near the bottom of the buffer, then copy the contents at the bottom. In the unlikely case where the new row size is greater than 2x smaller than the old one, and the cursor is in the middle, copy 1/2 screenful from the top and bottom of the cursor position. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-10 04:04:39 +08:00
if (vc->vc_y > new_rows) {
if (old_rows - vc->vc_y < new_rows) {
/*
* Cursor near the bottom, copy contents from the
* bottom of buffer
*/
old_origin += (old_rows - new_rows) * old_row_size;
end = vc->vc_scr_end;
} else {
/*
* Cursor is in no man's land, copy 1/2 screenful
* from the top and bottom of cursor position
*/
old_origin += (vc->vc_y - new_rows/2) * old_row_size;
[PATCH] vc: Use correct size on buffer copy in vc_resize In the unlikely case of the new screen width much wider then the old, use (old_row_size * new_rows) instead of new_screen_size to prevent a buffer overrun during the copy. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-15 21:34:33 +08:00
end = old_origin + (old_row_size * new_rows);
[PATCH] console: Fix buffer copy on vc resize On a vc resize, the contents of the old screen buffer are transferred to the new screenbuffer. If the new screenbuffer is smaller than the old one, only the contents from the bottom are copied to new. If the contents of the old buffer are located at the top, then the contents will not be copied to the new buffer resulting in a blank screen. This bug will happen only if the vc in question is not in the foreground. Doing an fbset -a or con2fbmap will trigger this bug. To fix this problem, base the start of the copy from the location of the current cursor. If the cursor is near the top of the buffer, copy the contents at the top, and if the cursor is near the bottom of the buffer, then copy the contents at the bottom. In the unlikely case where the new row size is greater than 2x smaller than the old one, and the cursor is in the middle, copy 1/2 screenful from the top and bottom of the cursor position. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-10 04:04:39 +08:00
}
} else
/*
* Cursor near the top, copy contents from the top of buffer
*/
[PATCH] vc: Use correct size on buffer copy in vc_resize In the unlikely case of the new screen width much wider then the old, use (old_row_size * new_rows) instead of new_screen_size to prevent a buffer overrun during the copy. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-15 21:34:33 +08:00
end = (old_rows > new_rows) ? old_origin +
(old_row_size * new_rows) :
[PATCH] console: Fix buffer copy on vc resize On a vc resize, the contents of the old screen buffer are transferred to the new screenbuffer. If the new screenbuffer is smaller than the old one, only the contents from the bottom are copied to new. If the contents of the old buffer are located at the top, then the contents will not be copied to the new buffer resulting in a blank screen. This bug will happen only if the vc in question is not in the foreground. Doing an fbset -a or con2fbmap will trigger this bug. To fix this problem, base the start of the copy from the location of the current cursor. If the cursor is near the top of the buffer, copy the contents at the top, and if the cursor is near the bottom of the buffer, then copy the contents at the bottom. In the unlikely case where the new row size is greater than 2x smaller than the old one, and the cursor is in the middle, copy 1/2 screenful from the top and bottom of the cursor position. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-10 04:04:39 +08:00
vc->vc_scr_end;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
update_attr(vc);
[PATCH] console: Fix buffer copy on vc resize On a vc resize, the contents of the old screen buffer are transferred to the new screenbuffer. If the new screenbuffer is smaller than the old one, only the contents from the bottom are copied to new. If the contents of the old buffer are located at the top, then the contents will not be copied to the new buffer resulting in a blank screen. This bug will happen only if the vc in question is not in the foreground. Doing an fbset -a or con2fbmap will trigger this bug. To fix this problem, base the start of the copy from the location of the current cursor. If the cursor is near the top of the buffer, copy the contents at the top, and if the cursor is near the bottom of the buffer, then copy the contents at the bottom. In the unlikely case where the new row size is greater than 2x smaller than the old one, and the cursor is in the middle, copy 1/2 screenful from the top and bottom of the cursor position. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-10 04:04:39 +08:00
while (old_origin < end) {
scr_memcpyw((unsigned short *) new_origin,
(unsigned short *) old_origin, rlth);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (rrem)
[PATCH] console: Fix buffer copy on vc resize On a vc resize, the contents of the old screen buffer are transferred to the new screenbuffer. If the new screenbuffer is smaller than the old one, only the contents from the bottom are copied to new. If the contents of the old buffer are located at the top, then the contents will not be copied to the new buffer resulting in a blank screen. This bug will happen only if the vc in question is not in the foreground. Doing an fbset -a or con2fbmap will trigger this bug. To fix this problem, base the start of the copy from the location of the current cursor. If the cursor is near the top of the buffer, copy the contents at the top, and if the cursor is near the bottom of the buffer, then copy the contents at the bottom. In the unlikely case where the new row size is greater than 2x smaller than the old one, and the cursor is in the middle, copy 1/2 screenful from the top and bottom of the cursor position. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-10 04:04:39 +08:00
scr_memsetw((void *)(new_origin + rlth),
vc->vc_video_erase_char, rrem);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
old_origin += old_row_size;
new_origin += new_row_size;
}
if (new_scr_end > new_origin)
[PATCH] console: Fix buffer copy on vc resize On a vc resize, the contents of the old screen buffer are transferred to the new screenbuffer. If the new screenbuffer is smaller than the old one, only the contents from the bottom are copied to new. If the contents of the old buffer are located at the top, then the contents will not be copied to the new buffer resulting in a blank screen. This bug will happen only if the vc in question is not in the foreground. Doing an fbset -a or con2fbmap will trigger this bug. To fix this problem, base the start of the copy from the location of the current cursor. If the cursor is near the top of the buffer, copy the contents at the top, and if the cursor is near the bottom of the buffer, then copy the contents at the bottom. In the unlikely case where the new row size is greater than 2x smaller than the old one, and the cursor is in the middle, copy 1/2 screenful from the top and bottom of the cursor position. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-10 04:04:39 +08:00
scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
new_scr_end - new_origin);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (vc->vc_kmalloced)
kfree(vc->vc_screenbuf);
vc->vc_screenbuf = newscreen;
vc->vc_kmalloced = 1;
vc->vc_screenbuf_size = new_screen_size;
set_origin(vc);
/* do part of a reset_terminal() */
vc->vc_top = 0;
vc->vc_bottom = vc->vc_rows;
gotoxy(vc, vc->vc_x, vc->vc_y);
save_cur(vc);
if (vc->vc_tty) {
struct winsize ws, *cws = &vc->vc_tty->winsize;
memset(&ws, 0, sizeof(ws));
ws.ws_row = vc->vc_rows;
ws.ws_col = vc->vc_cols;
ws.ws_ypixel = vc->vc_scan_lines;
if ((ws.ws_row != cws->ws_row || ws.ws_col != cws->ws_col) &&
vc->vc_tty->pgrp > 0)
kill_pg(vc->vc_tty->pgrp, SIGWINCH, 1);
*cws = ws;
}
if (CON_IS_VISIBLE(vc))
update_screen(vc);
return err;
}
void vc_disallocate(unsigned int currcons)
{
WARN_CONSOLE_UNLOCKED();
if (vc_cons_allocated(currcons)) {
struct vc_data *vc = vc_cons[currcons].d;
vc->vc_sw->con_deinit(vc);
if (vc->vc_kmalloced)
kfree(vc->vc_screenbuf);
if (currcons >= MIN_NR_CONSOLES)
kfree(vc);
vc_cons[currcons].d = NULL;
}
}
/*
* VT102 emulator
*/
#define set_kbd(vc, x) set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
#define clr_kbd(vc, x) clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
#define is_kbd(vc, x) vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
#define decarm VC_REPEAT
#define decckm VC_CKMODE
#define kbdapplic VC_APPLIC
#define lnm VC_CRLF
/*
* this is what the terminal answers to a ESC-Z or csi0c query.
*/
#define VT100ID "\033[?1;2c"
#define VT102ID "\033[?6c"
unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
8,12,10,14, 9,13,11,15 };
/* the default colour table, for VGA+ colour systems */
int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
/*
* gotoxy() must verify all boundaries, because the arguments
* might also be negative. If the given position is out of
* bounds, the cursor is placed at the nearest margin.
*/
static void gotoxy(struct vc_data *vc, int new_x, int new_y)
{
int min_y, max_y;
if (new_x < 0)
vc->vc_x = 0;
else {
if (new_x >= vc->vc_cols)
vc->vc_x = vc->vc_cols - 1;
else
vc->vc_x = new_x;
}
if (vc->vc_decom) {
min_y = vc->vc_top;
max_y = vc->vc_bottom;
} else {
min_y = 0;
max_y = vc->vc_rows;
}
if (new_y < min_y)
vc->vc_y = min_y;
else if (new_y >= max_y)
vc->vc_y = max_y - 1;
else
vc->vc_y = new_y;
vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
vc->vc_need_wrap = 0;
}
/* for absolute user moves, when decom is set */
static void gotoxay(struct vc_data *vc, int new_x, int new_y)
{
gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
}
void scrollback(struct vc_data *vc, int lines)
{
if (!lines)
lines = vc->vc_rows / 2;
scrolldelta(-lines);
}
void scrollfront(struct vc_data *vc, int lines)
{
if (!lines)
lines = vc->vc_rows / 2;
scrolldelta(lines);
}
static void lf(struct vc_data *vc)
{
/* don't scroll if above bottom of scrolling region, or
* if below scrolling region
*/
if (vc->vc_y + 1 == vc->vc_bottom)
scrup(vc, vc->vc_top, vc->vc_bottom, 1);
else if (vc->vc_y < vc->vc_rows - 1) {
vc->vc_y++;
vc->vc_pos += vc->vc_size_row;
}
vc->vc_need_wrap = 0;
}
static void ri(struct vc_data *vc)
{
/* don't scroll if below top of scrolling region, or
* if above scrolling region
*/
if (vc->vc_y == vc->vc_top)
scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
else if (vc->vc_y > 0) {
vc->vc_y--;
vc->vc_pos -= vc->vc_size_row;
}
vc->vc_need_wrap = 0;
}
static inline void cr(struct vc_data *vc)
{
vc->vc_pos -= vc->vc_x << 1;
vc->vc_need_wrap = vc->vc_x = 0;
}
static inline void bs(struct vc_data *vc)
{
if (vc->vc_x) {
vc->vc_pos -= 2;
vc->vc_x--;
vc->vc_need_wrap = 0;
}
}
static inline void del(struct vc_data *vc)
{
/* ignored */
}
static void csi_J(struct vc_data *vc, int vpar)
{
unsigned int count;
unsigned short * start;
switch (vpar) {
case 0: /* erase from cursor to end of display */
count = (vc->vc_scr_end - vc->vc_pos) >> 1;
start = (unsigned short *)vc->vc_pos;
if (DO_UPDATE(vc)) {
/* do in two stages */
vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
vc->vc_cols - vc->vc_x);
vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
vc->vc_rows - vc->vc_y - 1,
vc->vc_cols);
}
break;
case 1: /* erase from start to cursor */
count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
start = (unsigned short *)vc->vc_origin;
if (DO_UPDATE(vc)) {
/* do in two stages */
vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
vc->vc_cols);
vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
vc->vc_x + 1);
}
break;
case 2: /* erase whole display */
count = vc->vc_cols * vc->vc_rows;
start = (unsigned short *)vc->vc_origin;
if (DO_UPDATE(vc))
vc->vc_sw->con_clear(vc, 0, 0,
vc->vc_rows,
vc->vc_cols);
break;
default:
return;
}
scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
vc->vc_need_wrap = 0;
}
static void csi_K(struct vc_data *vc, int vpar)
{
unsigned int count;
unsigned short * start;
switch (vpar) {
case 0: /* erase from cursor to end of line */
count = vc->vc_cols - vc->vc_x;
start = (unsigned short *)vc->vc_pos;
if (DO_UPDATE(vc))
vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
vc->vc_cols - vc->vc_x);
break;
case 1: /* erase from start of line to cursor */
start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
count = vc->vc_x + 1;
if (DO_UPDATE(vc))
vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
vc->vc_x + 1);
break;
case 2: /* erase whole line */
start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
count = vc->vc_cols;
if (DO_UPDATE(vc))
vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
vc->vc_cols);
break;
default:
return;
}
scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
vc->vc_need_wrap = 0;
}
static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
{ /* not vt100? */
int count;
if (!vpar)
vpar++;
count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
if (DO_UPDATE(vc))
vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
vc->vc_need_wrap = 0;
}
static void default_attr(struct vc_data *vc)
{
vc->vc_intensity = 1;
vc->vc_underline = 0;
vc->vc_reverse = 0;
vc->vc_blink = 0;
vc->vc_color = vc->vc_def_color;
}
/* console_sem is held */
static void csi_m(struct vc_data *vc)
{
int i;
for (i = 0; i <= vc->vc_npar; i++)
switch (vc->vc_par[i]) {
case 0: /* all attributes off */
default_attr(vc);
break;
case 1:
vc->vc_intensity = 2;
break;
case 2:
vc->vc_intensity = 0;
break;
case 4:
vc->vc_underline = 1;
break;
case 5:
vc->vc_blink = 1;
break;
case 7:
vc->vc_reverse = 1;
break;
case 10: /* ANSI X3.64-1979 (SCO-ish?)
* Select primary font, don't display
* control chars if defined, don't set
* bit 8 on output.
*/
vc->vc_translate = set_translate(vc->vc_charset == 0
? vc->vc_G0_charset
: vc->vc_G1_charset, vc);
vc->vc_disp_ctrl = 0;
vc->vc_toggle_meta = 0;
break;
case 11: /* ANSI X3.64-1979 (SCO-ish?)
* Select first alternate font, lets
* chars < 32 be displayed as ROM chars.
*/
vc->vc_translate = set_translate(IBMPC_MAP, vc);
vc->vc_disp_ctrl = 1;
vc->vc_toggle_meta = 0;
break;
case 12: /* ANSI X3.64-1979 (SCO-ish?)
* Select second alternate font, toggle
* high bit before displaying as ROM char.
*/
vc->vc_translate = set_translate(IBMPC_MAP, vc);
vc->vc_disp_ctrl = 1;
vc->vc_toggle_meta = 1;
break;
case 21:
case 22:
vc->vc_intensity = 1;
break;
case 24:
vc->vc_underline = 0;
break;
case 25:
vc->vc_blink = 0;
break;
case 27:
vc->vc_reverse = 0;
break;
case 38: /* ANSI X3.64-1979 (SCO-ish?)
* Enables underscore, white foreground
* with white underscore (Linux - use
* default foreground).
*/
vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
vc->vc_underline = 1;
break;
case 39: /* ANSI X3.64-1979 (SCO-ish?)
* Disable underline option.
* Reset colour to default? It did this
* before...
*/
vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
vc->vc_underline = 0;
break;
case 49:
vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
break;
default:
if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
vc->vc_color = color_table[vc->vc_par[i] - 30]
| (vc->vc_color & 0xf0);
else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
| (vc->vc_color & 0x0f);
break;
}
update_attr(vc);
}
static void respond_string(const char *p, struct tty_struct *tty)
{
while (*p) {
tty_insert_flip_char(tty, *p, 0);
p++;
}
con_schedule_flip(tty);
}
static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
{
char buf[40];
sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
respond_string(buf, tty);
}
static inline void status_report(struct tty_struct *tty)
{
respond_string("\033[0n", tty); /* Terminal ok */
}
static inline void respond_ID(struct tty_struct * tty)
{
respond_string(VT102ID, tty);
}
void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
{
char buf[8];
sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
(char)('!' + mry));
respond_string(buf, tty);
}
/* invoked via ioctl(TIOCLINUX) and through set_selection */
int mouse_reporting(void)
{
return vc_cons[fg_console].d->vc_report_mouse;
}
/* console_sem is held */
static void set_mode(struct vc_data *vc, int on_off)
{
int i;
for (i = 0; i <= vc->vc_npar; i++)
if (vc->vc_ques) {
switch(vc->vc_par[i]) { /* DEC private modes set/reset */
case 1: /* Cursor keys send ^[Ox/^[[x */
if (on_off)
set_kbd(vc, decckm);
else
clr_kbd(vc, decckm);
break;
case 3: /* 80/132 mode switch unimplemented */
vc->vc_deccolm = on_off;
#if 0
vc_resize(deccolm ? 132 : 80, vc->vc_rows);
/* this alone does not suffice; some user mode
utility has to change the hardware regs */
#endif
break;
case 5: /* Inverted screen on/off */
if (vc->vc_decscnm != on_off) {
vc->vc_decscnm = on_off;
invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
update_attr(vc);
}
break;
case 6: /* Origin relative/absolute */
vc->vc_decom = on_off;
gotoxay(vc, 0, 0);
break;
case 7: /* Autowrap on/off */
vc->vc_decawm = on_off;
break;
case 8: /* Autorepeat on/off */
if (on_off)
set_kbd(vc, decarm);
else
clr_kbd(vc, decarm);
break;
case 9:
vc->vc_report_mouse = on_off ? 1 : 0;
break;
case 25: /* Cursor on/off */
vc->vc_deccm = on_off;
break;
case 1000:
vc->vc_report_mouse = on_off ? 2 : 0;
break;
}
} else {
switch(vc->vc_par[i]) { /* ANSI modes set/reset */
case 3: /* Monitor (display ctrls) */
vc->vc_disp_ctrl = on_off;
break;
case 4: /* Insert Mode on/off */
vc->vc_decim = on_off;
break;
case 20: /* Lf, Enter == CrLf/Lf */
if (on_off)
set_kbd(vc, lnm);
else
clr_kbd(vc, lnm);
break;
}
}
}
/* console_sem is held */
static void setterm_command(struct vc_data *vc)
{
switch(vc->vc_par[0]) {
case 1: /* set color for underline mode */
if (vc->vc_can_do_color &&
vc->vc_par[1] < 16) {
vc->vc_ulcolor = color_table[vc->vc_par[1]];
if (vc->vc_underline)
update_attr(vc);
}
break;
case 2: /* set color for half intensity mode */
if (vc->vc_can_do_color &&
vc->vc_par[1] < 16) {
vc->vc_halfcolor = color_table[vc->vc_par[1]];
if (vc->vc_intensity == 0)
update_attr(vc);
}
break;
case 8: /* store colors as defaults */
vc->vc_def_color = vc->vc_attr;
if (vc->vc_hi_font_mask == 0x100)
vc->vc_def_color >>= 1;
default_attr(vc);
update_attr(vc);
break;
case 9: /* set blanking interval */
blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
poke_blanked_console();
break;
case 10: /* set bell frequency in Hz */
if (vc->vc_npar >= 1)
vc->vc_bell_pitch = vc->vc_par[1];
else
vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
break;
case 11: /* set bell duration in msec */
if (vc->vc_npar >= 1)
vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
vc->vc_par[1] * HZ / 1000 : 0;
else
vc->vc_bell_duration = DEFAULT_BELL_DURATION;
break;
case 12: /* bring specified console to the front */
if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
set_console(vc->vc_par[1] - 1);
break;
case 13: /* unblank the screen */
poke_blanked_console();
break;
case 14: /* set vesa powerdown interval */
vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
break;
case 15: /* activate the previous console */
set_console(last_console);
break;
}
}
/* console_sem is held */
static void csi_at(struct vc_data *vc, unsigned int nr)
{
if (nr > vc->vc_cols - vc->vc_x)
nr = vc->vc_cols - vc->vc_x;
else if (!nr)
nr = 1;
insert_char(vc, nr);
}
/* console_sem is held */
static void csi_L(struct vc_data *vc, unsigned int nr)
{
if (nr > vc->vc_rows - vc->vc_y)
nr = vc->vc_rows - vc->vc_y;
else if (!nr)
nr = 1;
scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
vc->vc_need_wrap = 0;
}
/* console_sem is held */
static void csi_P(struct vc_data *vc, unsigned int nr)
{
if (nr > vc->vc_cols - vc->vc_x)
nr = vc->vc_cols - vc->vc_x;
else if (!nr)
nr = 1;
delete_char(vc, nr);
}
/* console_sem is held */
static void csi_M(struct vc_data *vc, unsigned int nr)
{
if (nr > vc->vc_rows - vc->vc_y)
nr = vc->vc_rows - vc->vc_y;
else if (!nr)
nr=1;
scrup(vc, vc->vc_y, vc->vc_bottom, nr);
vc->vc_need_wrap = 0;
}
/* console_sem is held (except via vc_init->reset_terminal */
static void save_cur(struct vc_data *vc)
{
vc->vc_saved_x = vc->vc_x;
vc->vc_saved_y = vc->vc_y;
vc->vc_s_intensity = vc->vc_intensity;
vc->vc_s_underline = vc->vc_underline;
vc->vc_s_blink = vc->vc_blink;
vc->vc_s_reverse = vc->vc_reverse;
vc->vc_s_charset = vc->vc_charset;
vc->vc_s_color = vc->vc_color;
vc->vc_saved_G0 = vc->vc_G0_charset;
vc->vc_saved_G1 = vc->vc_G1_charset;
}
/* console_sem is held */
static void restore_cur(struct vc_data *vc)
{
gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
vc->vc_intensity = vc->vc_s_intensity;
vc->vc_underline = vc->vc_s_underline;
vc->vc_blink = vc->vc_s_blink;
vc->vc_reverse = vc->vc_s_reverse;
vc->vc_charset = vc->vc_s_charset;
vc->vc_color = vc->vc_s_color;
vc->vc_G0_charset = vc->vc_saved_G0;
vc->vc_G1_charset = vc->vc_saved_G1;
vc->vc_translate = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
update_attr(vc);
vc->vc_need_wrap = 0;
}
enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
ESpalette };
/* console_sem is held (except via vc_init()) */
static void reset_terminal(struct vc_data *vc, int do_clear)
{
vc->vc_top = 0;
vc->vc_bottom = vc->vc_rows;
vc->vc_state = ESnormal;
vc->vc_ques = 0;
vc->vc_translate = set_translate(LAT1_MAP, vc);
vc->vc_G0_charset = LAT1_MAP;
vc->vc_G1_charset = GRAF_MAP;
vc->vc_charset = 0;
vc->vc_need_wrap = 0;
vc->vc_report_mouse = 0;
vc->vc_utf = 0;
vc->vc_utf_count = 0;
vc->vc_disp_ctrl = 0;
vc->vc_toggle_meta = 0;
vc->vc_decscnm = 0;
vc->vc_decom = 0;
vc->vc_decawm = 1;
vc->vc_deccm = 1;
vc->vc_decim = 0;
set_kbd(vc, decarm);
clr_kbd(vc, decckm);
clr_kbd(vc, kbdapplic);
clr_kbd(vc, lnm);
kbd_table[vc->vc_num].lockstate = 0;
kbd_table[vc->vc_num].slockstate = 0;
kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
/* do not do set_leds here because this causes an endless tasklet loop
when the keyboard hasn't been initialized yet */
vc->vc_cursor_type = CUR_DEFAULT;
vc->vc_complement_mask = vc->vc_s_complement_mask;
default_attr(vc);
update_attr(vc);
vc->vc_tab_stop[0] = 0x01010100;
vc->vc_tab_stop[1] =
vc->vc_tab_stop[2] =
vc->vc_tab_stop[3] =
vc->vc_tab_stop[4] = 0x01010101;
vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
vc->vc_bell_duration = DEFAULT_BELL_DURATION;
gotoxy(vc, 0, 0);
save_cur(vc);
if (do_clear)
csi_J(vc, 2);
}
/* console_sem is held */
static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
{
/*
* Control characters can be used in the _middle_
* of an escape sequence.
*/
switch (c) {
case 0:
return;
case 7:
if (vc->vc_bell_duration)
kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
return;
case 8:
bs(vc);
return;
case 9:
vc->vc_pos -= (vc->vc_x << 1);
while (vc->vc_x < vc->vc_cols - 1) {
vc->vc_x++;
if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
break;
}
vc->vc_pos += (vc->vc_x << 1);
return;
case 10: case 11: case 12:
lf(vc);
if (!is_kbd(vc, lnm))
return;
case 13:
cr(vc);
return;
case 14:
vc->vc_charset = 1;
vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
vc->vc_disp_ctrl = 1;
return;
case 15:
vc->vc_charset = 0;
vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
vc->vc_disp_ctrl = 0;
return;
case 24: case 26:
vc->vc_state = ESnormal;
return;
case 27:
vc->vc_state = ESesc;
return;
case 127:
del(vc);
return;
case 128+27:
vc->vc_state = ESsquare;
return;
}
switch(vc->vc_state) {
case ESesc:
vc->vc_state = ESnormal;
switch (c) {
case '[':
vc->vc_state = ESsquare;
return;
case ']':
vc->vc_state = ESnonstd;
return;
case '%':
vc->vc_state = ESpercent;
return;
case 'E':
cr(vc);
lf(vc);
return;
case 'M':
ri(vc);
return;
case 'D':
lf(vc);
return;
case 'H':
vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
return;
case 'Z':
respond_ID(tty);
return;
case '7':
save_cur(vc);
return;
case '8':
restore_cur(vc);
return;
case '(':
vc->vc_state = ESsetG0;
return;
case ')':
vc->vc_state = ESsetG1;
return;
case '#':
vc->vc_state = EShash;
return;
case 'c':
reset_terminal(vc, 1);
return;
case '>': /* Numeric keypad */
clr_kbd(vc, kbdapplic);
return;
case '=': /* Appl. keypad */
set_kbd(vc, kbdapplic);
return;
}
return;
case ESnonstd:
if (c=='P') { /* palette escape sequence */
for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
vc->vc_par[vc->vc_npar] = 0;
vc->vc_npar = 0;
vc->vc_state = ESpalette;
return;
} else if (c=='R') { /* reset palette */
reset_palette(vc);
vc->vc_state = ESnormal;
} else
vc->vc_state = ESnormal;
return;
case ESpalette:
if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
if (vc->vc_npar == 7) {
int i = vc->vc_par[0] * 3, j = 1;
vc->vc_palette[i] = 16 * vc->vc_par[j++];
vc->vc_palette[i++] += vc->vc_par[j++];
vc->vc_palette[i] = 16 * vc->vc_par[j++];
vc->vc_palette[i++] += vc->vc_par[j++];
vc->vc_palette[i] = 16 * vc->vc_par[j++];
vc->vc_palette[i] += vc->vc_par[j];
set_palette(vc);
vc->vc_state = ESnormal;
}
} else
vc->vc_state = ESnormal;
return;
case ESsquare:
for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
vc->vc_par[vc->vc_npar] = 0;
vc->vc_npar = 0;
vc->vc_state = ESgetpars;
if (c == '[') { /* Function key */
vc->vc_state=ESfunckey;
return;
}
vc->vc_ques = (c == '?');
if (vc->vc_ques)
return;
case ESgetpars:
if (c == ';' && vc->vc_npar < NPAR - 1) {
vc->vc_npar++;
return;
} else if (c>='0' && c<='9') {
vc->vc_par[vc->vc_npar] *= 10;
vc->vc_par[vc->vc_npar] += c - '0';
return;
} else
vc->vc_state = ESgotpars;
case ESgotpars:
vc->vc_state = ESnormal;
switch(c) {
case 'h':
set_mode(vc, 1);
return;
case 'l':
set_mode(vc, 0);
return;
case 'c':
if (vc->vc_ques) {
if (vc->vc_par[0])
vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
else
vc->vc_cursor_type = CUR_DEFAULT;
return;
}
break;
case 'm':
if (vc->vc_ques) {
clear_selection();
if (vc->vc_par[0])
vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
else
vc->vc_complement_mask = vc->vc_s_complement_mask;
return;
}
break;
case 'n':
if (!vc->vc_ques) {
if (vc->vc_par[0] == 5)
status_report(tty);
else if (vc->vc_par[0] == 6)
cursor_report(vc, tty);
}
return;
}
if (vc->vc_ques) {
vc->vc_ques = 0;
return;
}
switch(c) {
case 'G': case '`':
if (vc->vc_par[0])
vc->vc_par[0]--;
gotoxy(vc, vc->vc_par[0], vc->vc_y);
return;
case 'A':
if (!vc->vc_par[0])
vc->vc_par[0]++;
gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
return;
case 'B': case 'e':
if (!vc->vc_par[0])
vc->vc_par[0]++;
gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
return;
case 'C': case 'a':
if (!vc->vc_par[0])
vc->vc_par[0]++;
gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
return;
case 'D':
if (!vc->vc_par[0])
vc->vc_par[0]++;
gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
return;
case 'E':
if (!vc->vc_par[0])
vc->vc_par[0]++;
gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
return;
case 'F':
if (!vc->vc_par[0])
vc->vc_par[0]++;
gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
return;
case 'd':
if (vc->vc_par[0])
vc->vc_par[0]--;
gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
return;
case 'H': case 'f':
if (vc->vc_par[0])
vc->vc_par[0]--;
if (vc->vc_par[1])
vc->vc_par[1]--;
gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
return;
case 'J':
csi_J(vc, vc->vc_par[0]);
return;
case 'K':
csi_K(vc, vc->vc_par[0]);
return;
case 'L':
csi_L(vc, vc->vc_par[0]);
return;
case 'M':
csi_M(vc, vc->vc_par[0]);
return;
case 'P':
csi_P(vc, vc->vc_par[0]);
return;
case 'c':
if (!vc->vc_par[0])
respond_ID(tty);
return;
case 'g':
if (!vc->vc_par[0])
vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
else if (vc->vc_par[0] == 3) {
vc->vc_tab_stop[0] =
vc->vc_tab_stop[1] =
vc->vc_tab_stop[2] =
vc->vc_tab_stop[3] =
vc->vc_tab_stop[4] = 0;
}
return;
case 'm':
csi_m(vc);
return;
case 'q': /* DECLL - but only 3 leds */
/* map 0,1,2,3 to 0,1,2,4 */
if (vc->vc_par[0] < 4)
setledstate(kbd_table + vc->vc_num,
(vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
return;
case 'r':
if (!vc->vc_par[0])
vc->vc_par[0]++;
if (!vc->vc_par[1])
vc->vc_par[1] = vc->vc_rows;
/* Minimum allowed region is 2 lines */
if (vc->vc_par[0] < vc->vc_par[1] &&
vc->vc_par[1] <= vc->vc_rows) {
vc->vc_top = vc->vc_par[0] - 1;
vc->vc_bottom = vc->vc_par[1];
gotoxay(vc, 0, 0);
}
return;
case 's':
save_cur(vc);
return;
case 'u':
restore_cur(vc);
return;
case 'X':
csi_X(vc, vc->vc_par[0]);
return;
case '@':
csi_at(vc, vc->vc_par[0]);
return;
case ']': /* setterm functions */
setterm_command(vc);
return;
}
return;
case ESpercent:
vc->vc_state = ESnormal;
switch (c) {
case '@': /* defined in ISO 2022 */
vc->vc_utf = 0;
return;
case 'G': /* prelim official escape code */
case '8': /* retained for compatibility */
vc->vc_utf = 1;
return;
}
return;
case ESfunckey:
vc->vc_state = ESnormal;
return;
case EShash:
vc->vc_state = ESnormal;
if (c == '8') {
/* DEC screen alignment test. kludge :-) */
vc->vc_video_erase_char =
(vc->vc_video_erase_char & 0xff00) | 'E';
csi_J(vc, 2);
vc->vc_video_erase_char =
(vc->vc_video_erase_char & 0xff00) | ' ';
do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
}
return;
case ESsetG0:
if (c == '0')
vc->vc_G0_charset = GRAF_MAP;
else if (c == 'B')
vc->vc_G0_charset = LAT1_MAP;
else if (c == 'U')
vc->vc_G0_charset = IBMPC_MAP;
else if (c == 'K')
vc->vc_G0_charset = USER_MAP;
if (vc->vc_charset == 0)
vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
vc->vc_state = ESnormal;
return;
case ESsetG1:
if (c == '0')
vc->vc_G1_charset = GRAF_MAP;
else if (c == 'B')
vc->vc_G1_charset = LAT1_MAP;
else if (c == 'U')
vc->vc_G1_charset = IBMPC_MAP;
else if (c == 'K')
vc->vc_G1_charset = USER_MAP;
if (vc->vc_charset == 1)
vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
vc->vc_state = ESnormal;
return;
default:
vc->vc_state = ESnormal;
}
}
/* This is a temporary buffer used to prepare a tty console write
* so that we can easily avoid touching user space while holding the
* console spinlock. It is allocated in con_init and is shared by
* this code and the vc_screen read/write tty calls.
*
* We have to allocate this statically in the kernel data section
* since console_init (and thus con_init) are called before any
* kernel memory allocation is available.
*/
char con_buf[CON_BUF_SIZE];
DECLARE_MUTEX(con_buf_sem);
/* acquires console_sem */
static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
#ifdef VT_BUF_VRAM_ONLY
#define FLUSH do { } while(0);
#else
#define FLUSH if (draw_x >= 0) { \
vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
draw_x = -1; \
}
#endif
int c, tc, ok, n = 0, draw_x = -1;
unsigned int currcons;
unsigned long draw_from = 0, draw_to = 0;
struct vc_data *vc;
u16 himask, charmask;
const unsigned char *orig_buf = NULL;
int orig_count;
if (in_interrupt())
return count;
might_sleep();
acquire_console_sem();
vc = tty->driver_data;
if (vc == NULL) {
printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
release_console_sem();
return 0;
}
currcons = vc->vc_num;
if (!vc_cons_allocated(currcons)) {
/* could this happen? */
static int error = 0;
if (!error) {
error = 1;
printk("con_write: tty %d not allocated\n", currcons+1);
}
release_console_sem();
return 0;
}
release_console_sem();
orig_buf = buf;
orig_count = count;
/* At this point 'buf' is guaranteed to be a kernel buffer
* and therefore no access to userspace (and therefore sleeping)
* will be needed. The con_buf_sem serializes all tty based
* console rendering and vcs write/read operations. We hold
* the console spinlock during the entire write.
*/
acquire_console_sem();
vc = tty->driver_data;
if (vc == NULL) {
printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
release_console_sem();
goto out;
}
himask = vc->vc_hi_font_mask;
charmask = himask ? 0x1ff : 0xff;
/* undraw cursor first */
if (IS_FG(vc))
hide_cursor(vc);
while (!tty->stopped && count) {
int orig = *buf;
c = orig;
buf++;
n++;
count--;
/* Do no translation at all in control states */
if (vc->vc_state != ESnormal) {
tc = c;
} else if (vc->vc_utf) {
/* Combine UTF-8 into Unicode */
/* Incomplete characters silently ignored */
if(c > 0x7f) {
if (vc->vc_utf_count > 0 && (c & 0xc0) == 0x80) {
vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
vc->vc_utf_count--;
if (vc->vc_utf_count == 0)
tc = c = vc->vc_utf_char;
else continue;
} else {
if ((c & 0xe0) == 0xc0) {
vc->vc_utf_count = 1;
vc->vc_utf_char = (c & 0x1f);
} else if ((c & 0xf0) == 0xe0) {
vc->vc_utf_count = 2;
vc->vc_utf_char = (c & 0x0f);
} else if ((c & 0xf8) == 0xf0) {
vc->vc_utf_count = 3;
vc->vc_utf_char = (c & 0x07);
} else if ((c & 0xfc) == 0xf8) {
vc->vc_utf_count = 4;
vc->vc_utf_char = (c & 0x03);
} else if ((c & 0xfe) == 0xfc) {
vc->vc_utf_count = 5;
vc->vc_utf_char = (c & 0x01);
} else
vc->vc_utf_count = 0;
continue;
}
} else {
tc = c;
vc->vc_utf_count = 0;
}
} else { /* no utf */
tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c];
}
/* If the original code was a control character we
* only allow a glyph to be displayed if the code is
* not normally used (such as for cursor movement) or
* if the disp_ctrl mode has been explicitly enabled.
* Certain characters (as given by the CTRL_ALWAYS
* bitmap) are always displayed as control characters,
* as the console would be pretty useless without
* them; to display an arbitrary font position use the
* direct-to-font zone in UTF-8 mode.
*/
ok = tc && (c >= 32 ||
(!vc->vc_utf && !(((vc->vc_disp_ctrl ? CTRL_ALWAYS
: CTRL_ACTION) >> c) & 1)))
&& (c != 127 || vc->vc_disp_ctrl)
&& (c != 128+27);
if (vc->vc_state == ESnormal && ok) {
/* Now try to find out how to display it */
tc = conv_uni_to_pc(vc, tc);
if ( tc == -4 ) {
/* If we got -4 (not found) then see if we have
defined a replacement character (U+FFFD) */
tc = conv_uni_to_pc(vc, 0xfffd);
/* One reason for the -4 can be that we just
did a clear_unimap();
try at least to show something. */
if (tc == -4)
tc = c;
} else if ( tc == -3 ) {
/* Bad hash table -- hope for the best */
tc = c;
}
if (tc & ~charmask)
continue; /* Conversion failed */
if (vc->vc_need_wrap || vc->vc_decim)
FLUSH
if (vc->vc_need_wrap) {
cr(vc);
lf(vc);
}
if (vc->vc_decim)
insert_char(vc, 1);
scr_writew(himask ?
((vc->vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
(vc->vc_attr << 8) + tc,
(u16 *) vc->vc_pos);
if (DO_UPDATE(vc) && draw_x < 0) {
draw_x = vc->vc_x;
draw_from = vc->vc_pos;
}
if (vc->vc_x == vc->vc_cols - 1) {
vc->vc_need_wrap = vc->vc_decawm;
draw_to = vc->vc_pos + 2;
} else {
vc->vc_x++;
draw_to = (vc->vc_pos += 2);
}
continue;
}
FLUSH
do_con_trol(tty, vc, orig);
}
FLUSH
console_conditional_schedule();
release_console_sem();
out:
return n;
#undef FLUSH
}
/*
* This is the console switching callback.
*
* Doing console switching in a process context allows
* us to do the switches asynchronously (needed when we want
* to switch due to a keyboard interrupt). Synchronization
* with other console code and prevention of re-entrancy is
* ensured with console_sem.
*/
static void console_callback(void *ignored)
{
acquire_console_sem();
if (want_console >= 0) {
if (want_console != fg_console &&
vc_cons_allocated(want_console)) {
hide_cursor(vc_cons[fg_console].d);
change_console(vc_cons[want_console].d);
/* we only changed when the console had already
been allocated - a new console is not created
in an interrupt routine */
}
want_console = -1;
}
if (do_poke_blanked_console) { /* do not unblank for a LED change */
do_poke_blanked_console = 0;
poke_blanked_console();
}
if (scrollback_delta) {
struct vc_data *vc = vc_cons[fg_console].d;
clear_selection();
if (vc->vc_mode == KD_TEXT)
vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
scrollback_delta = 0;
}
if (blank_timer_expired) {
do_blank_screen(0);
blank_timer_expired = 0;
}
release_console_sem();
}
void set_console(int nr)
{
want_console = nr;
schedule_console_callback();
}
struct tty_driver *console_driver;
#ifdef CONFIG_VT_CONSOLE
/*
* Console on virtual terminal
*
* The console must be locked when we get here.
*/
static void vt_console_print(struct console *co, const char *b, unsigned count)
{
struct vc_data *vc = vc_cons[fg_console].d;
unsigned char c;
static unsigned long printing;
const ushort *start;
ushort cnt = 0;
ushort myx;
/* console busy or not yet initialized */
if (!printable || test_and_set_bit(0, &printing))
return;
if (kmsg_redirect && vc_cons_allocated(kmsg_redirect - 1))
vc = vc_cons[kmsg_redirect - 1].d;
/* read `x' only after setting currcons properly (otherwise
the `x' macro will read the x of the foreground console). */
myx = vc->vc_x;
if (!vc_cons_allocated(fg_console)) {
/* impossible */
/* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
goto quit;
}
if (vc->vc_mode != KD_TEXT)
goto quit;
/* undraw cursor first */
if (IS_FG(vc))
hide_cursor(vc);
start = (ushort *)vc->vc_pos;
/* Contrived structure to try to emulate original need_wrap behaviour
* Problems caused when we have need_wrap set on '\n' character */
while (count--) {
c = *b++;
if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
if (cnt > 0) {
if (CON_IS_VISIBLE(vc))
vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
vc->vc_x += cnt;
if (vc->vc_need_wrap)
vc->vc_x--;
cnt = 0;
}
if (c == 8) { /* backspace */
bs(vc);
start = (ushort *)vc->vc_pos;
myx = vc->vc_x;
continue;
}
if (c != 13)
lf(vc);
cr(vc);
start = (ushort *)vc->vc_pos;
myx = vc->vc_x;
if (c == 10 || c == 13)
continue;
}
scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
cnt++;
if (myx == vc->vc_cols - 1) {
vc->vc_need_wrap = 1;
continue;
}
vc->vc_pos += 2;
myx++;
}
if (cnt > 0) {
if (CON_IS_VISIBLE(vc))
vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
vc->vc_x += cnt;
if (vc->vc_x == vc->vc_cols) {
vc->vc_x--;
vc->vc_need_wrap = 1;
}
}
set_cursor(vc);
quit:
clear_bit(0, &printing);
}
static struct tty_driver *vt_console_device(struct console *c, int *index)
{
*index = c->index ? c->index-1 : fg_console;
return console_driver;
}
static struct console vt_console_driver = {
.name = "tty",
.write = vt_console_print,
.device = vt_console_device,
.unblank = unblank_screen,
.flags = CON_PRINTBUFFER,
.index = -1,
};
#endif
/*
* Handling of Linux-specific VC ioctls
*/
/*
* Generally a bit racy with respect to console_sem().
*
* There are some functions which don't need it.
*
* There are some functions which can sleep for arbitrary periods
* (paste_selection) but we don't need the lock there anyway.
*
* set_selection has locking, and definitely needs it
*/
int tioclinux(struct tty_struct *tty, unsigned long arg)
{
char type, data;
char __user *p = (char __user *)arg;
int lines;
int ret;
if (tty->driver->type != TTY_DRIVER_TYPE_CONSOLE)
return -EINVAL;
if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
return -EPERM;
if (get_user(type, p))
return -EFAULT;
ret = 0;
switch (type)
{
case TIOCL_SETSEL:
acquire_console_sem();
ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
release_console_sem();
break;
case TIOCL_PASTESEL:
ret = paste_selection(tty);
break;
case TIOCL_UNBLANKSCREEN:
[PATCH] Console blanking locking fix I've had WARN_CONSOLE_UNLOCKED warnings when calling TIOCLINUX TIOCL_BLANKSCREEN and TIOCL_UNBLANKSCREEN. (I'm blind and I use a braille display. I use those functions to blank my laptop's screen so people don't read it, and hopefully to conserve power.) The warnings are from these places: do_blank_screen at drivers/char/vt.c:2754 (Not tainted) save_screen at drivers/char/vt.c:575 (Not tainted) do_unblank_screen at drivers/char/vt.c:2822 (Not tainted) set_palette at drivers/char/vt.c:2908 (Not tainted) At a glance I would think the following patch ought to fix that. Tested on one machine. Could you please tell me if this is correct and/or forward the patch where appropriate... Signed-off-by: Stephane Doyon <s.doyon@videotron.ca> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 06:17:31 +08:00
acquire_console_sem();
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
unblank_screen();
[PATCH] Console blanking locking fix I've had WARN_CONSOLE_UNLOCKED warnings when calling TIOCLINUX TIOCL_BLANKSCREEN and TIOCL_UNBLANKSCREEN. (I'm blind and I use a braille display. I use those functions to blank my laptop's screen so people don't read it, and hopefully to conserve power.) The warnings are from these places: do_blank_screen at drivers/char/vt.c:2754 (Not tainted) save_screen at drivers/char/vt.c:575 (Not tainted) do_unblank_screen at drivers/char/vt.c:2822 (Not tainted) set_palette at drivers/char/vt.c:2908 (Not tainted) At a glance I would think the following patch ought to fix that. Tested on one machine. Could you please tell me if this is correct and/or forward the patch where appropriate... Signed-off-by: Stephane Doyon <s.doyon@videotron.ca> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 06:17:31 +08:00
release_console_sem();
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
break;
case TIOCL_SELLOADLUT:
ret = sel_loadlut(p);
break;
case TIOCL_GETSHIFTSTATE:
/*
* Make it possible to react to Shift+Mousebutton.
* Note that 'shift_state' is an undocumented
* kernel-internal variable; programs not closely
* related to the kernel should not use this.
*/
data = shift_state;
ret = __put_user(data, p);
break;
case TIOCL_GETMOUSEREPORTING:
data = mouse_reporting();
ret = __put_user(data, p);
break;
case TIOCL_SETVESABLANK:
set_vesa_blanking(p);
break;
[PATCH] vt: add TIOCL_GETKMSGREDIRECT Add TIOCL_GETKMSGREDIRECT needed by the userland suspend tool to get the current value of kmsg_redirect from the kernel so that it can save it and restore it after resume. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@suse.cz> Cc: Michael Kerrisk <mtk-manpages@gmx.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-31 18:30:58 +08:00
case TIOCL_GETKMSGREDIRECT:
data = kmsg_redirect;
ret = __put_user(data, p);
break;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
case TIOCL_SETKMSGREDIRECT:
if (!capable(CAP_SYS_ADMIN)) {
ret = -EPERM;
} else {
if (get_user(data, p+1))
ret = -EFAULT;
else
kmsg_redirect = data;
}
break;
case TIOCL_GETFGCONSOLE:
ret = fg_console;
break;
case TIOCL_SCROLLCONSOLE:
if (get_user(lines, (s32 __user *)(p+4))) {
ret = -EFAULT;
} else {
scrollfront(vc_cons[fg_console].d, lines);
ret = 0;
}
break;
case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
[PATCH] Console blanking locking fix I've had WARN_CONSOLE_UNLOCKED warnings when calling TIOCLINUX TIOCL_BLANKSCREEN and TIOCL_UNBLANKSCREEN. (I'm blind and I use a braille display. I use those functions to blank my laptop's screen so people don't read it, and hopefully to conserve power.) The warnings are from these places: do_blank_screen at drivers/char/vt.c:2754 (Not tainted) save_screen at drivers/char/vt.c:575 (Not tainted) do_unblank_screen at drivers/char/vt.c:2822 (Not tainted) set_palette at drivers/char/vt.c:2908 (Not tainted) At a glance I would think the following patch ought to fix that. Tested on one machine. Could you please tell me if this is correct and/or forward the patch where appropriate... Signed-off-by: Stephane Doyon <s.doyon@videotron.ca> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 06:17:31 +08:00
acquire_console_sem();
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
ignore_poke = 1;
do_blank_screen(0);
[PATCH] Console blanking locking fix I've had WARN_CONSOLE_UNLOCKED warnings when calling TIOCLINUX TIOCL_BLANKSCREEN and TIOCL_UNBLANKSCREEN. (I'm blind and I use a braille display. I use those functions to blank my laptop's screen so people don't read it, and hopefully to conserve power.) The warnings are from these places: do_blank_screen at drivers/char/vt.c:2754 (Not tainted) save_screen at drivers/char/vt.c:575 (Not tainted) do_unblank_screen at drivers/char/vt.c:2822 (Not tainted) set_palette at drivers/char/vt.c:2908 (Not tainted) At a glance I would think the following patch ought to fix that. Tested on one machine. Could you please tell me if this is correct and/or forward the patch where appropriate... Signed-off-by: Stephane Doyon <s.doyon@videotron.ca> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-07 06:17:31 +08:00
release_console_sem();
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
break;
case TIOCL_BLANKEDSCREEN:
ret = console_blanked;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
/*
* /dev/ttyN handling
*/
static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
int retval;
retval = do_con_write(tty, buf, count);
con_flush_chars(tty);
return retval;
}
static void con_put_char(struct tty_struct *tty, unsigned char ch)
{
if (in_interrupt())
return; /* n_r3964 calls put_char() from interrupt context */
do_con_write(tty, &ch, 1);
}
static int con_write_room(struct tty_struct *tty)
{
if (tty->stopped)
return 0;
return 4096; /* No limit, really; we're not buffering */
}
static int con_chars_in_buffer(struct tty_struct *tty)
{
return 0; /* we're not buffering */
}
/*
* con_throttle and con_unthrottle are only used for
* paste_selection(), which has to stuff in a large number of
* characters...
*/
static void con_throttle(struct tty_struct *tty)
{
}
static void con_unthrottle(struct tty_struct *tty)
{
struct vc_data *vc = tty->driver_data;
wake_up_interruptible(&vc->paste_wait);
}
/*
* Turn the Scroll-Lock LED on when the tty is stopped
*/
static void con_stop(struct tty_struct *tty)
{
int console_num;
if (!tty)
return;
console_num = tty->index;
if (!vc_cons_allocated(console_num))
return;
set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
set_leds();
}
/*
* Turn the Scroll-Lock LED off when the console is started
*/
static void con_start(struct tty_struct *tty)
{
int console_num;
if (!tty)
return;
console_num = tty->index;
if (!vc_cons_allocated(console_num))
return;
clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
set_leds();
}
static void con_flush_chars(struct tty_struct *tty)
{
struct vc_data *vc;
if (in_interrupt()) /* from flush_to_ldisc */
return;
/* if we race with con_close(), vt may be null */
acquire_console_sem();
vc = tty->driver_data;
if (vc)
set_cursor(vc);
release_console_sem();
}
/*
* Allocate the console screen memory.
*/
static int con_open(struct tty_struct *tty, struct file *filp)
{
unsigned int currcons = tty->index;
int ret = 0;
acquire_console_sem();
[PATCH] Remove race between con_open and con_close [ Same race and same patch also by Steven Rostedt <rostedt@goodmis.org> ] I have a laptop (G3 powerbook) which will pretty reliably hit a race between con_open and con_close late in the boot process and oops in vt_ioctl due to tty->driver_data being NULL. What happens is this: process A opens /dev/tty6; it comes into con_open() (drivers/char/vt.c) and assign a non-NULL value to tty->driver_data. Then process A closes that and concurrently process B opens /dev/tty6. Process A gets through con_close() and clears tty->driver_data, since tty->count == 1. However, before process A can decrement tty->count, we switch to process B (e.g. at the down(&tty_sem) call at drivers/char/tty_io.c line 1626). So process B gets to run and comes into con_open with tty->count == 2, as tty->count is incremented (in init_dev) before con_open is called. Because tty->count != 1, we don't set tty->driver_data. Then when the process tries to do anything with that fd, it oopses. The simple and effective fix for this is to test tty->driver_data rather than tty->count in con_open. The testing and setting of tty->driver_data is serialized with respect to the clearing of tty->driver_data in con_close by the console_sem. We can't get a situation where con_open sees tty->driver_data != NULL and then con_close on a different fd clears tty->driver_data, because tty->count is incremented before con_open is called. Thus this patch eliminates the race, and in fact with this patch my laptop doesn't oops. Signed-off-by: Paul Mackerras <paulus@samba.org> [ Same patch Signed-off-by: Steven Rostedt <rostedt@goodmis.org> in http://marc.theaimsgroup.com/?l=linux-kernel&m=112450820432121&w=2 ] Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-28 07:40:01 +08:00
if (tty->driver_data == NULL) {
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
ret = vc_allocate(currcons);
if (ret == 0) {
struct vc_data *vc = vc_cons[currcons].d;
tty->driver_data = vc;
vc->vc_tty = tty;
if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
}
release_console_sem();
vcs_make_devfs(tty);
return ret;
}
}
release_console_sem();
return ret;
}
/*
[PATCH] sem2mutex: tty Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-23 19:00:31 +08:00
* We take tty_mutex in here to prevent another thread from coming in via init_dev
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
* and taking a ref against the tty while we're in the process of forgetting
* about it and cleaning things up.
*
* This is because vcs_remove_devfs() can sleep and will drop the BKL.
*/
static void con_close(struct tty_struct *tty, struct file *filp)
{
[PATCH] sem2mutex: tty Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-23 19:00:31 +08:00
mutex_lock(&tty_mutex);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
acquire_console_sem();
if (tty && tty->count == 1) {
struct vc_data *vc = tty->driver_data;
if (vc)
vc->vc_tty = NULL;
tty->driver_data = NULL;
release_console_sem();
vcs_remove_devfs(tty);
[PATCH] sem2mutex: tty Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-23 19:00:31 +08:00
mutex_unlock(&tty_mutex);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
[PATCH] sem2mutex: tty Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-23 19:00:31 +08:00
* tty_mutex is released, but we still hold BKL, so there is
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
* still exclusion against init_dev()
*/
return;
}
release_console_sem();
[PATCH] sem2mutex: tty Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-23 19:00:31 +08:00
mutex_unlock(&tty_mutex);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
static void vc_init(struct vc_data *vc, unsigned int rows,
unsigned int cols, int do_clear)
{
int j, k ;
vc->vc_cols = cols;
vc->vc_rows = rows;
vc->vc_size_row = cols << 1;
vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
set_origin(vc);
vc->vc_pos = vc->vc_origin;
reset_vc(vc);
for (j=k=0; j<16; j++) {
vc->vc_palette[k++] = default_red[j] ;
vc->vc_palette[k++] = default_grn[j] ;
vc->vc_palette[k++] = default_blu[j] ;
}
vc->vc_def_color = 0x07; /* white */
vc->vc_ulcolor = 0x0f; /* bold white */
vc->vc_halfcolor = 0x08; /* grey */
init_waitqueue_head(&vc->paste_wait);
reset_terminal(vc, do_clear);
}
/*
* This routine initializes console interrupts, and does nothing
* else. If you want the screen to clear, call tty_write with
* the appropriate escape-sequence.
*/
static int __init con_init(void)
{
const char *display_desc = NULL;
struct vc_data *vc;
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
unsigned int currcons = 0, i;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
acquire_console_sem();
if (conswitchp)
display_desc = conswitchp->con_startup();
if (!display_desc) {
fg_console = 0;
release_console_sem();
return 0;
}
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
struct con_driver *con_driver = &registered_con_driver[i];
if (con_driver->con == NULL) {
con_driver->con = conswitchp;
con_driver->desc = display_desc;
con_driver->flag = CON_DRIVER_FLAG_INIT;
con_driver->first = 0;
con_driver->last = MAX_NR_CONSOLES - 1;
break;
}
}
for (i = 0; i < MAX_NR_CONSOLES; i++)
con_driver_map[i] = conswitchp;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
init_timer(&console_timer);
console_timer.function = blank_screen_t;
if (blankinterval) {
blank_state = blank_normal_wait;
mod_timer(&console_timer, jiffies + blankinterval);
}
/*
* kmalloc is not running yet - we use the bootmem allocator.
*/
for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
visual_init(vc, currcons, 1);
vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
vc->vc_kmalloced = 0;
vc_init(vc, vc->vc_rows, vc->vc_cols,
currcons || !vc->vc_sw->con_save_screen);
}
currcons = fg_console = 0;
master_display_fg = vc = vc_cons[currcons].d;
set_origin(vc);
save_screen(vc);
gotoxy(vc, vc->vc_x, vc->vc_y);
csi_J(vc, 0);
update_screen(vc);
printk("Console: %s %s %dx%d",
vc->vc_can_do_color ? "colour" : "mono",
display_desc, vc->vc_cols, vc->vc_rows);
printable = 1;
printk("\n");
release_console_sem();
#ifdef CONFIG_VT_CONSOLE
register_console(&vt_console_driver);
#endif
return 0;
}
console_initcall(con_init);
static struct tty_operations con_ops = {
.open = con_open,
.close = con_close,
.write = con_write,
.write_room = con_write_room,
.put_char = con_put_char,
.flush_chars = con_flush_chars,
.chars_in_buffer = con_chars_in_buffer,
.ioctl = vt_ioctl,
.stop = con_stop,
.start = con_start,
.throttle = con_throttle,
.unthrottle = con_unthrottle,
};
int __init vty_init(void)
{
vcs_init();
console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
if (!console_driver)
panic("Couldn't allocate console driver\n");
console_driver->owner = THIS_MODULE;
console_driver->name = "tty";
console_driver->name_base = 1;
console_driver->major = TTY_MAJOR;
console_driver->minor_start = 1;
console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
console_driver->init_termios = tty_std_termios;
console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
tty_set_operations(console_driver, &con_ops);
if (tty_register_driver(console_driver))
panic("Couldn't register console driver\n");
kbd_init();
console_map_init();
#ifdef CONFIG_PROM_CONSOLE
prom_con_init();
#endif
#ifdef CONFIG_MDA_CONSOLE
mda_console_init();
#endif
return 0;
}
#ifndef VT_SINGLE_DRIVER
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
#include <linux/device.h>
static struct class *vtconsole_class;
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
static int bind_con_driver(const struct consw *csw, int first, int last,
int deflt)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
{
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
struct module *owner = csw->owner;
const char *desc = NULL;
struct con_driver *con_driver;
int i, j = -1, k = -1, retval = -ENODEV;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (!try_module_get(owner))
return -ENODEV;
[PATCH] Detaching fbcon: fix give_up_console() To allow for detaching fbcon, it must be able to give up the console. However, the function give_up_console() is plain broken. It just sets the entries in the console driver map to NULL, it leaves the vt layer without a console driver, and does not decrement the module reference count. Calling give_up_console() is guaranteed to hang the machine.. To fix this problem, ensure that the virtual consoles are not left dangling without a driver. All systems have a default boot driver (either vgacon or dummycon) which is never unloaded. For those vt's that lost their driver, the default boot driver is reassigned back to them. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:03 +08:00
acquire_console_sem();
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
/* check if driver is registered */
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
con_driver = &registered_con_driver[i];
if (con_driver->con == csw) {
desc = con_driver->desc;
retval = 0;
break;
}
}
if (retval)
goto err;
if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
csw->con_startup();
con_driver->flag |= CON_DRIVER_FLAG_INIT;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
[PATCH] Detaching fbcon: fix give_up_console() To allow for detaching fbcon, it must be able to give up the console. However, the function give_up_console() is plain broken. It just sets the entries in the console driver map to NULL, it leaves the vt layer without a console driver, and does not decrement the module reference count. Calling give_up_console() is guaranteed to hang the machine.. To fix this problem, ensure that the virtual consoles are not left dangling without a driver. All systems have a default boot driver (either vgacon or dummycon) which is never unloaded. For those vt's that lost their driver, the default boot driver is reassigned back to them. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:03 +08:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (deflt) {
if (conswitchp)
module_put(conswitchp->owner);
[PATCH] Detaching fbcon: fix give_up_console() To allow for detaching fbcon, it must be able to give up the console. However, the function give_up_console() is plain broken. It just sets the entries in the console driver map to NULL, it leaves the vt layer without a console driver, and does not decrement the module reference count. Calling give_up_console() is guaranteed to hang the machine.. To fix this problem, ensure that the virtual consoles are not left dangling without a driver. All systems have a default boot driver (either vgacon or dummycon) which is never unloaded. For those vt's that lost their driver, the default boot driver is reassigned back to them. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:03 +08:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
__module_get(owner);
conswitchp = csw;
}
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
first = max(first, con_driver->first);
last = min(last, con_driver->last);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
for (i = first; i <= last; i++) {
int old_was_color;
struct vc_data *vc = vc_cons[i].d;
if (con_driver_map[i])
module_put(con_driver_map[i]->owner);
__module_get(owner);
con_driver_map[i] = csw;
if (!vc || !vc->vc_sw)
continue;
j = i;
[PATCH] Detaching fbcon: fix give_up_console() To allow for detaching fbcon, it must be able to give up the console. However, the function give_up_console() is plain broken. It just sets the entries in the console driver map to NULL, it leaves the vt layer without a console driver, and does not decrement the module reference count. Calling give_up_console() is guaranteed to hang the machine.. To fix this problem, ensure that the virtual consoles are not left dangling without a driver. All systems have a default boot driver (either vgacon or dummycon) which is never unloaded. For those vt's that lost their driver, the default boot driver is reassigned back to them. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:03 +08:00
[PATCH] vt: Delay the update of the visible console Delay the update of the visible framebuffer console until all other consoles have been initialized in order to avoid losing information. This only seems to be a problem with modules, not with built-in drivers. Signed-off-by: David Hollister <david.hollister@amd.com> Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:26:41 +08:00
if (CON_IS_VISIBLE(vc)) {
k = i;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
save_screen(vc);
[PATCH] vt: Delay the update of the visible console Delay the update of the visible framebuffer console until all other consoles have been initialized in order to avoid losing information. This only seems to be a problem with modules, not with built-in drivers. Signed-off-by: David Hollister <david.hollister@amd.com> Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:26:41 +08:00
}
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
old_was_color = vc->vc_can_do_color;
vc->vc_sw->con_deinit(vc);
vc->vc_origin = (unsigned long)vc->vc_screenbuf;
visual_init(vc, i, 0);
[PATCH] Detaching fbcon: fix give_up_console() To allow for detaching fbcon, it must be able to give up the console. However, the function give_up_console() is plain broken. It just sets the entries in the console driver map to NULL, it leaves the vt layer without a console driver, and does not decrement the module reference count. Calling give_up_console() is guaranteed to hang the machine.. To fix this problem, ensure that the virtual consoles are not left dangling without a driver. All systems have a default boot driver (either vgacon or dummycon) which is never unloaded. For those vt's that lost their driver, the default boot driver is reassigned back to them. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:03 +08:00
set_origin(vc);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
update_attr(vc);
/* If the console changed between mono <-> color, then
* the attributes in the screenbuf will be wrong. The
* following resets all attributes to something sane.
*/
if (old_was_color != vc->vc_can_do_color)
clear_buffer_attributes(vc);
}
[PATCH] vt: Delay the update of the visible console Delay the update of the visible framebuffer console until all other consoles have been initialized in order to avoid losing information. This only seems to be a problem with modules, not with built-in drivers. Signed-off-by: David Hollister <david.hollister@amd.com> Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:26:41 +08:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
printk("Console: switching ");
if (!deflt)
printk("consoles %d-%d ", first+1, last+1);
[PATCH] vt: Delay the update of the visible console Delay the update of the visible framebuffer console until all other consoles have been initialized in order to avoid losing information. This only seems to be a problem with modules, not with built-in drivers. Signed-off-by: David Hollister <david.hollister@amd.com> Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:26:41 +08:00
if (j >= 0) {
struct vc_data *vc = vc_cons[j].d;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
printk("to %s %s %dx%d\n",
[PATCH] vt: Delay the update of the visible console Delay the update of the visible framebuffer console until all other consoles have been initialized in order to avoid losing information. This only seems to be a problem with modules, not with built-in drivers. Signed-off-by: David Hollister <david.hollister@amd.com> Signed-off-by: Jordan Crouse <jordan.crouse@amd.com> Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:26:41 +08:00
vc->vc_can_do_color ? "colour" : "mono",
desc, vc->vc_cols, vc->vc_rows);
if (k >= 0) {
vc = vc_cons[k].d;
update_screen(vc);
}
} else
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
printk("to %s\n", desc);
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
retval = 0;
err:
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
release_console_sem();
module_put(owner);
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
return retval;
};
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
[PATCH] VT binding: Make VT binding a Kconfig option To enable this feature, CONFIG_VT_HW_CONSOLE_BINDING must be set to 'y'. This feature will default to 'n' to minimize users accidentally corrupting their virtual terminals. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
#ifdef CONFIG_VT_HW_CONSOLE_BINDING
static int con_is_graphics(const struct consw *csw, int first, int last)
{
int i, retval = 0;
for (i = first; i <= last; i++) {
struct vc_data *vc = vc_cons[i].d;
if (vc && vc->vc_mode == KD_GRAPHICS) {
retval = 1;
break;
}
}
return retval;
}
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
static int unbind_con_driver(const struct consw *csw, int first, int last,
int deflt)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
{
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
struct module *owner = csw->owner;
const struct consw *defcsw = NULL;
struct con_driver *con_driver = NULL, *con_back = NULL;
int i, retval = -ENODEV;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
if (!try_module_get(owner))
return -ENODEV;
acquire_console_sem();
/* check if driver is registered and if it is unbindable */
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
con_driver = &registered_con_driver[i];
if (con_driver->con == csw &&
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
con_driver->flag & CON_DRIVER_FLAG_MODULE) {
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
retval = 0;
break;
}
}
if (retval) {
release_console_sem();
goto err;
}
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
retval = -ENODEV;
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
/* check if backup driver exists */
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
con_back = &registered_con_driver[i];
if (con_back->con &&
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
!(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
defcsw = con_back->con;
retval = 0;
break;
}
}
if (retval) {
release_console_sem();
goto err;
}
if (!con_is_bound(csw)) {
release_console_sem();
goto err;
}
first = max(first, con_driver->first);
last = min(last, con_driver->last);
for (i = first; i <= last; i++) {
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (con_driver_map[i] == csw) {
module_put(csw->owner);
con_driver_map[i] = NULL;
}
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
}
if (!con_is_bound(defcsw)) {
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
const struct consw *defconsw = conswitchp;
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
defcsw->con_startup();
con_back->flag |= CON_DRIVER_FLAG_INIT;
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
/*
* vgacon may change the default driver to point
* to dummycon, we restore it here...
*/
conswitchp = defconsw;
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
}
if (!con_is_bound(csw))
con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
release_console_sem();
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
/* ignore return value, binding should not fail */
bind_con_driver(defcsw, first, last, deflt);
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
err:
module_put(owner);
return retval;
}
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
static int vt_bind(struct con_driver *con)
{
const struct consw *defcsw = NULL, *csw = NULL;
int i, more = 1, first = -1, last = -1, deflt = 0;
if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
con_is_graphics(con->con, con->first, con->last))
goto err;
csw = con->con;
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
struct con_driver *con = &registered_con_driver[i];
if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
defcsw = con->con;
break;
}
}
if (!defcsw)
goto err;
while (more) {
more = 0;
for (i = con->first; i <= con->last; i++) {
if (con_driver_map[i] == defcsw) {
if (first == -1)
first = i;
last = i;
more = 1;
} else if (first != -1)
break;
}
if (first == 0 && last == MAX_NR_CONSOLES -1)
deflt = 1;
if (first != -1)
bind_con_driver(csw, first, last, deflt);
first = -1;
last = -1;
deflt = 0;
}
err:
return 0;
}
static int vt_unbind(struct con_driver *con)
{
const struct consw *csw = NULL;
int i, more = 1, first = -1, last = -1, deflt = 0;
if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
con_is_graphics(con->con, con->first, con->last))
goto err;
csw = con->con;
while (more) {
more = 0;
for (i = con->first; i <= con->last; i++) {
if (con_driver_map[i] == csw) {
if (first == -1)
first = i;
last = i;
more = 1;
} else if (first != -1)
break;
}
if (first == 0 && last == MAX_NR_CONSOLES -1)
deflt = 1;
if (first != -1)
unbind_con_driver(csw, first, last, deflt);
first = -1;
last = -1;
deflt = 0;
}
err:
return 0;
}
[PATCH] VT binding: Make VT binding a Kconfig option To enable this feature, CONFIG_VT_HW_CONSOLE_BINDING must be set to 'y'. This feature will default to 'n' to minimize users accidentally corrupting their virtual terminals. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
#else
static inline int vt_bind(struct con_driver *con)
{
return 0;
}
static inline int vt_unbind(struct con_driver *con)
{
return 0;
}
#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
static ssize_t store_bind(struct class_device *class_device,
const char *buf, size_t count)
{
struct con_driver *con = class_get_devdata(class_device);
int bind = simple_strtoul(buf, NULL, 0);
if (bind)
vt_bind(con);
else
vt_unbind(con);
return count;
}
static ssize_t show_bind(struct class_device *class_device, char *buf)
{
struct con_driver *con = class_get_devdata(class_device);
int bind = con_is_bound(con->con);
return snprintf(buf, PAGE_SIZE, "%i\n", bind);
}
static ssize_t show_name(struct class_device *class_device, char *buf)
{
struct con_driver *con = class_get_devdata(class_device);
return snprintf(buf, PAGE_SIZE, "%s %s\n",
(con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
con->desc);
}
static struct class_device_attribute class_device_attrs[] = {
__ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
__ATTR(name, S_IRUGO, show_name, NULL),
};
static int vtconsole_init_class_device(struct con_driver *con)
{
int i;
class_set_devdata(con->class_dev, con);
for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
class_device_create_file(con->class_dev,
&class_device_attrs[i]);
return 0;
}
static void vtconsole_deinit_class_device(struct con_driver *con)
{
int i;
for (i = 0; i < ARRAY_SIZE(class_device_attrs); i++)
class_device_remove_file(con->class_dev,
&class_device_attrs[i]);
}
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
/**
* con_is_bound - checks if driver is bound to the console
* @csw: console driver
*
* RETURNS: zero if unbound, nonzero if bound
*
* Drivers can call this and if zero, they should release
* all resources allocated on con_startup()
*/
int con_is_bound(const struct consw *csw)
{
int i, bound = 0;
for (i = 0; i < MAX_NR_CONSOLES; i++) {
if (con_driver_map[i] == csw) {
bound = 1;
break;
}
}
return bound;
}
EXPORT_SYMBOL(con_is_bound);
/**
* register_con_driver - register console driver to console layer
* @csw: console driver
* @first: the first console to take over, minimum value is 0
* @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
*
* DESCRIPTION: This function registers a console driver which can later
* bind to a range of consoles specified by @first and @last. It will
* also initialize the console driver by calling con_startup().
*/
int register_con_driver(const struct consw *csw, int first, int last)
{
struct module *owner = csw->owner;
struct con_driver *con_driver;
const char *desc;
int i, retval = 0;
if (!try_module_get(owner))
return -ENODEV;
acquire_console_sem();
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
con_driver = &registered_con_driver[i];
/* already registered */
if (con_driver->con == csw)
retval = -EINVAL;
}
if (retval)
goto err;
desc = csw->con_startup();
if (!desc)
goto err;
retval = -EINVAL;
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
con_driver = &registered_con_driver[i];
if (con_driver->con == NULL) {
con_driver->con = csw;
con_driver->desc = desc;
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
con_driver->node = i;
con_driver->flag = CON_DRIVER_FLAG_MODULE |
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
CON_DRIVER_FLAG_INIT;
con_driver->first = first;
con_driver->last = last;
retval = 0;
break;
}
}
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
if (retval)
goto err;
con_driver->class_dev = class_device_create(vtconsole_class, NULL,
MKDEV(0, con_driver->node),
NULL, "vtcon%i",
con_driver->node);
if (IS_ERR(con_driver->class_dev)) {
printk(KERN_WARNING "Unable to create class_device for %s; "
"errno = %ld\n", con_driver->desc,
PTR_ERR(con_driver->class_dev));
con_driver->class_dev = NULL;
} else {
vtconsole_init_class_device(con_driver);
}
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
err:
release_console_sem();
module_put(owner);
return retval;
}
EXPORT_SYMBOL(register_con_driver);
/**
* unregister_con_driver - unregister console driver from console layer
* @csw: console driver
*
* DESCRIPTION: All drivers that registers to the console layer must
* call this function upon exit, or if the console driver is in a state
* where it won't be able to handle console services, such as the
* framebuffer console without loaded framebuffer drivers.
*
* The driver must unbind first prior to unregistration.
*/
int unregister_con_driver(const struct consw *csw)
{
int i, retval = -ENODEV;
acquire_console_sem();
/* cannot unregister a bound driver */
if (con_is_bound(csw))
goto err;
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
struct con_driver *con_driver = &registered_con_driver[i];
if (con_driver->con == csw &&
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
con_driver->flag & CON_DRIVER_FLAG_MODULE) {
vtconsole_deinit_class_device(con_driver);
class_device_destroy(vtconsole_class,
MKDEV(0, con_driver->node));
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
con_driver->con = NULL;
con_driver->desc = NULL;
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
con_driver->class_dev = NULL;
con_driver->node = 0;
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
con_driver->flag = 0;
con_driver->first = 0;
con_driver->last = 0;
retval = 0;
break;
}
}
err:
release_console_sem();
return retval;
}
EXPORT_SYMBOL(unregister_con_driver);
/*
* If we support more console drivers, this function is used
* when a driver wants to take over some existing consoles
* and become default driver for newly opened ones.
*
* take_over_console is basically a register followed by unbind
*/
int take_over_console(const struct consw *csw, int first, int last, int deflt)
{
int err;
err = register_con_driver(csw, first, last);
if (!err)
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
bind_con_driver(csw, first, last, deflt);
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
return err;
}
/*
* give_up_console is a wrapper to unregister_con_driver. It will only
* work if driver is fully unbound.
*/
void give_up_console(const struct consw *csw)
{
unregister_con_driver(csw);
}
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
static int __init vtconsole_class_init(void)
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
{
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
int i;
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
vtconsole_class = class_create(THIS_MODULE, "vtconsole");
if (IS_ERR(vtconsole_class)) {
printk(KERN_WARNING "Unable to create vt console class; "
"errno = %ld\n", PTR_ERR(vtconsole_class));
vtconsole_class = NULL;
}
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
/* Add system drivers to sysfs */
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
struct con_driver *con = &registered_con_driver[i];
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
if (con->con && !con->class_dev) {
con->class_dev =
class_device_create(vtconsole_class, NULL,
MKDEV(0, con->node), NULL,
"vtcon%i", con->node);
if (IS_ERR(con->class_dev)) {
printk(KERN_WARNING "Unable to create "
"class_device for %s; errno = %ld\n",
con->desc, PTR_ERR(con->class_dev));
con->class_dev = NULL;
} else {
vtconsole_init_class_device(con);
}
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
}
}
return 0;
}
[PATCH] VT binding: Add sysfs control to the VT layer Add sysfs control to the VT layer. A new sysfs class, 'vtconsole', and class devices 'vtcon[n]' are added. Each class device file has the following attributes: /sys/class/vtconsole/vtcon[n]/name - read-only attribute showing the name of the current backend /sys/class/vtconsole/vtcon[n]/bind - read/write attribute where: 0 - backend is unbound/unbind backend from the VT layer 1 - backend is bound/bind backend to the VT layer In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT. [akpm@osdl.org: warning fixes] Signed-off-by: Antonino Daplas <adaplas@pol.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:12 +08:00
postcore_initcall(vtconsole_class_init);
[PATCH] VT binding: Add binding/unbinding support for the VT console The framebuffer console is now able to dynamically bind and unbind from the VT console layer. Due to the way the VT console layer works, the drivers themselves decide when to bind or unbind. However, it was decided that binding must be controlled, not by the drivers themselves, but by the VT console layer. With this, dynamic binding is possible for all VT console drivers, not just fbcon. Thus, the VT console layer will impose the following to all VT console drivers: - all registered VT console drivers will be entered in a private list - drivers can register themselves to the VT console layer, but they cannot decide when to bind or unbind. (Exception: To maintain backwards compatibility, take_over_console() will automatically bind the driver after registration.) - drivers can remove themselves from the list by unregistering from the VT console layer. A prerequisite for unregistration is that the driver must not be bound. The following functions are new in the vt.c: register_con_driver() - public function, this function adds the VT console driver to an internal list maintained by the VT console bind_con_driver() - private function, it binds the driver to the console take_over_console() is changed to call register_con_driver() followed by a bind_con_driver(). This is the only time drivers can decide when to bind to the VT layer. This is to maintain backwards compatibility. unbind_con_driver() - private function, it unbinds the driver from its console. The vacated consoles will be taken over by the default boot console driver. unregister_con_driver() - public function, removes the driver from the internal list maintained by the VT console. It will only succeed if the driver is currently unbound. con_is_bound() checks if the driver is currently bound or not give_up_console() is just a wrapper to unregister_con_driver(). There are also 3 additional functions meant to be called only by the tty layer for sysfs control: vt_bind() - calls bind_con_driver() vt_unbind() - calls unbind_con_driver() vt_show_drivers() - shows the list of registered drivers Most VT console drivers will continue to work as is, but might have problems when unbinding or binding which should be fixable with minimal changes. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-26 15:27:08 +08:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
#endif
/*
* Screen blanking
*/
static void set_vesa_blanking(char __user *p)
{
unsigned int mode;
get_user(mode, p + 1);
vesa_blank_mode = (mode < 4) ? mode : 0;
}
void do_blank_screen(int entering_gfx)
{
struct vc_data *vc = vc_cons[fg_console].d;
int i;
WARN_CONSOLE_UNLOCKED();
if (console_blanked) {
if (blank_state == blank_vesa_wait) {
blank_state = blank_off;
[PATCH] Fix console blanking Current console blanking code is broken. It will first do a normal blank, then start the VESA blank timer if vesa_off_interval != 0, and then proceed to do the VESA blanking directly. After the timer expires it will do the VESA blanking a second time. Also the vesa_powerdown() function doesn't allow all VESA modes to be used. With this patch the behaviour is: 1. Blank: vesa_off_interval != 0 -> Do normal blank vesa_off_interval == 0 -> Do VESA blank 2. Start the VESA blank timer if vesa_off_interval != 0 and vesa_power_mode != 0. It also gets rid of the limiting vesa_powerdown() function. Signed-off-by: Ville Syrjala <syrjala@sci.fi> Cc: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:53:49 +08:00
vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
return;
}
if (blank_state != blank_normal_wait)
return;
blank_state = blank_off;
/* entering graphics mode? */
if (entering_gfx) {
hide_cursor(vc);
save_screen(vc);
vc->vc_sw->con_blank(vc, -1, 1);
console_blanked = fg_console + 1;
set_origin(vc);
return;
}
/* don't blank graphics */
if (vc->vc_mode != KD_TEXT) {
console_blanked = fg_console + 1;
return;
}
hide_cursor(vc);
del_timer_sync(&console_timer);
blank_timer_expired = 0;
save_screen(vc);
/* In case we need to reset origin, blanking hook returns 1 */
[PATCH] Fix console blanking Current console blanking code is broken. It will first do a normal blank, then start the VESA blank timer if vesa_off_interval != 0, and then proceed to do the VESA blanking directly. After the timer expires it will do the VESA blanking a second time. Also the vesa_powerdown() function doesn't allow all VESA modes to be used. With this patch the behaviour is: 1. Blank: vesa_off_interval != 0 -> Do normal blank vesa_off_interval == 0 -> Do VESA blank 2. Start the VESA blank timer if vesa_off_interval != 0 and vesa_power_mode != 0. It also gets rid of the limiting vesa_powerdown() function. Signed-off-by: Ville Syrjala <syrjala@sci.fi> Cc: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:53:49 +08:00
i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
console_blanked = fg_console + 1;
if (i)
set_origin(vc);
if (console_blank_hook && console_blank_hook(1))
return;
[PATCH] Fix console blanking Current console blanking code is broken. It will first do a normal blank, then start the VESA blank timer if vesa_off_interval != 0, and then proceed to do the VESA blanking directly. After the timer expires it will do the VESA blanking a second time. Also the vesa_powerdown() function doesn't allow all VESA modes to be used. With this patch the behaviour is: 1. Blank: vesa_off_interval != 0 -> Do normal blank vesa_off_interval == 0 -> Do VESA blank 2. Start the VESA blank timer if vesa_off_interval != 0 and vesa_power_mode != 0. It also gets rid of the limiting vesa_powerdown() function. Signed-off-by: Ville Syrjala <syrjala@sci.fi> Cc: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:53:49 +08:00
if (vesa_off_interval && vesa_blank_mode) {
[PATCH] vt.c build fix Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-07-15 18:56:25 +08:00
blank_state = blank_vesa_wait;
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
mod_timer(&console_timer, jiffies + vesa_off_interval);
}
}
EXPORT_SYMBOL(do_blank_screen);
/*
* Called by timer as well as from vt_console_driver
*/
void do_unblank_screen(int leaving_gfx)
{
struct vc_data *vc;
/* This should now always be called from a "sane" (read: can schedule)
* context for the sake of the low level drivers, except in the special
* case of oops_in_progress
*/
if (!oops_in_progress)
might_sleep();
WARN_CONSOLE_UNLOCKED();
ignore_poke = 0;
if (!console_blanked)
return;
if (!vc_cons_allocated(fg_console)) {
/* impossible */
printk("unblank_screen: tty %d not allocated ??\n", fg_console+1);
return;
}
vc = vc_cons[fg_console].d;
if (vc->vc_mode != KD_TEXT)
return; /* but leave console_blanked != 0 */
if (blankinterval) {
mod_timer(&console_timer, jiffies + blankinterval);
blank_state = blank_normal_wait;
}
console_blanked = 0;
if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
/* Low-level driver cannot restore -> do it ourselves */
update_screen(vc);
if (console_blank_hook)
console_blank_hook(0);
set_palette(vc);
set_cursor(vc);
}
EXPORT_SYMBOL(do_unblank_screen);
/*
* This is called by the outside world to cause a forced unblank, mostly for
* oopses. Currently, I just call do_unblank_screen(0), but we could eventually
* call it with 1 as an argument and so force a mode restore... that may kill
* X or at least garbage the screen but would also make the Oops visible...
*/
void unblank_screen(void)
{
do_unblank_screen(0);
}
/*
[PATCH] sem2mutex: tty Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-23 19:00:31 +08:00
* We defer the timer blanking to work queue so it can take the console mutex
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
* (console operations can still happen at irq time, but only from printk which
[PATCH] sem2mutex: tty Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-23 19:00:31 +08:00
* has the console mutex. Not perfect yet, but better than no locking
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
*/
static void blank_screen_t(unsigned long dummy)
{
[PATCH] console blanking oops fix When significant delays happen during boot (e.g. with a kernel debugger, but the problem has also seen in other cases) the timeout for blanking the console may trigger, but the work scheduler may not have been initialized, yet. schedule_work() will oops over the null keventd_wq. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-18 04:20:58 +08:00
if (unlikely(!keventd_up())) {
mod_timer(&console_timer, jiffies + blankinterval);
return;
}
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
blank_timer_expired = 1;
schedule_work(&console_work);
}
void poke_blanked_console(void)
{
WARN_CONSOLE_UNLOCKED();
/* Add this so we quickly catch whoever might call us in a non
* safe context. Nowadays, unblank_screen() isn't to be called in
* atomic contexts and is allowed to schedule (with the special case
* of oops_in_progress, but that isn't of any concern for this
* function. --BenH.
*/
might_sleep();
/* This isn't perfectly race free, but a race here would be mostly harmless,
* at worse, we'll do a spurrious blank and it's unlikely
*/
del_timer(&console_timer);
blank_timer_expired = 0;
if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
return;
if (console_blanked)
unblank_screen();
else if (blankinterval) {
mod_timer(&console_timer, jiffies + blankinterval);
blank_state = blank_normal_wait;
}
}
/*
* Palettes
*/
static void set_palette(struct vc_data *vc)
{
WARN_CONSOLE_UNLOCKED();
if (vc->vc_mode != KD_GRAPHICS)
vc->vc_sw->con_set_palette(vc, color_table);
}
static int set_get_cmap(unsigned char __user *arg, int set)
{
int i, j, k;
WARN_CONSOLE_UNLOCKED();
for (i = 0; i < 16; i++)
if (set) {
get_user(default_red[i], arg++);
get_user(default_grn[i], arg++);
get_user(default_blu[i], arg++);
} else {
put_user(default_red[i], arg++);
put_user(default_grn[i], arg++);
put_user(default_blu[i], arg++);
}
if (set) {
for (i = 0; i < MAX_NR_CONSOLES; i++)
if (vc_cons_allocated(i)) {
for (j = k = 0; j < 16; j++) {
vc_cons[i].d->vc_palette[k++] = default_red[j];
vc_cons[i].d->vc_palette[k++] = default_grn[j];
vc_cons[i].d->vc_palette[k++] = default_blu[j];
}
set_palette(vc_cons[i].d);
}
}
return 0;
}
/*
* Load palette into the DAC registers. arg points to a colour
* map, 3 bytes per colour, 16 colours, range from 0 to 255.
*/
int con_set_cmap(unsigned char __user *arg)
{
int rc;
acquire_console_sem();
rc = set_get_cmap (arg,1);
release_console_sem();
return rc;
}
int con_get_cmap(unsigned char __user *arg)
{
int rc;
acquire_console_sem();
rc = set_get_cmap (arg,0);
release_console_sem();
return rc;
}
void reset_palette(struct vc_data *vc)
{
int j, k;
for (j=k=0; j<16; j++) {
vc->vc_palette[k++] = default_red[j];
vc->vc_palette[k++] = default_grn[j];
vc->vc_palette[k++] = default_blu[j];
}
set_palette(vc);
}
/*
* Font switching
*
* Currently we only support fonts up to 32 pixels wide, at a maximum height
* of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
* depending on width) reserved for each character which is kinda wasty, but
* this is done in order to maintain compatibility with the EGA/VGA fonts. It
* is upto the actual low-level console-driver convert data into its favorite
* format (maybe we should add a `fontoffset' field to the `display'
* structure so we won't have to convert the fontdata all the time.
* /Jes
*/
#define max_font_size 65536
static int con_font_get(struct vc_data *vc, struct console_font_op *op)
{
struct console_font font;
int rc = -EINVAL;
int c;
if (vc->vc_mode != KD_TEXT)
return -EINVAL;
if (op->data) {
font.data = kmalloc(max_font_size, GFP_KERNEL);
if (!font.data)
return -ENOMEM;
} else
font.data = NULL;
acquire_console_sem();
if (vc->vc_sw->con_font_get)
rc = vc->vc_sw->con_font_get(vc, &font);
else
rc = -ENOSYS;
release_console_sem();
if (rc)
goto out;
c = (font.width+7)/8 * 32 * font.charcount;
if (op->data && font.charcount > op->charcount)
rc = -ENOSPC;
if (!(op->flags & KD_FONT_FLAG_OLD)) {
if (font.width > op->width || font.height > op->height)
rc = -ENOSPC;
} else {
if (font.width != 8)
rc = -EIO;
else if ((op->height && font.height > op->height) ||
font.height > 32)
rc = -ENOSPC;
}
if (rc)
goto out;
op->height = font.height;
op->width = font.width;
op->charcount = font.charcount;
if (op->data && copy_to_user(op->data, font.data, c))
rc = -EFAULT;
out:
kfree(font.data);
return rc;
}
static int con_font_set(struct vc_data *vc, struct console_font_op *op)
{
struct console_font font;
int rc = -EINVAL;
int size;
if (vc->vc_mode != KD_TEXT)
return -EINVAL;
if (!op->data)
return -EINVAL;
if (op->charcount > 512)
return -EINVAL;
if (!op->height) { /* Need to guess font height [compat] */
int h, i;
u8 __user *charmap = op->data;
u8 tmp;
/* If from KDFONTOP ioctl, don't allow things which can be done in userland,
so that we can get rid of this soon */
if (!(op->flags & KD_FONT_FLAG_OLD))
return -EINVAL;
for (h = 32; h > 0; h--)
for (i = 0; i < op->charcount; i++) {
if (get_user(tmp, &charmap[32*i+h-1]))
return -EFAULT;
if (tmp)
goto nonzero;
}
return -EINVAL;
nonzero:
op->height = h;
}
if (op->width <= 0 || op->width > 32 || op->height > 32)
return -EINVAL;
size = (op->width+7)/8 * 32 * op->charcount;
if (size > max_font_size)
return -ENOSPC;
font.charcount = op->charcount;
font.height = op->height;
font.width = op->width;
font.data = kmalloc(size, GFP_KERNEL);
if (!font.data)
return -ENOMEM;
if (copy_from_user(font.data, op->data, size)) {
kfree(font.data);
return -EFAULT;
}
acquire_console_sem();
if (vc->vc_sw->con_font_set)
rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
else
rc = -ENOSYS;
release_console_sem();
kfree(font.data);
return rc;
}
static int con_font_default(struct vc_data *vc, struct console_font_op *op)
{
struct console_font font = {.width = op->width, .height = op->height};
char name[MAX_FONT_NAME];
char *s = name;
int rc;
if (vc->vc_mode != KD_TEXT)
return -EINVAL;
if (!op->data)
s = NULL;
else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
return -EFAULT;
else
name[MAX_FONT_NAME - 1] = 0;
acquire_console_sem();
if (vc->vc_sw->con_font_default)
rc = vc->vc_sw->con_font_default(vc, &font, s);
else
rc = -ENOSYS;
release_console_sem();
if (!rc) {
op->width = font.width;
op->height = font.height;
}
return rc;
}
static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
{
int con = op->height;
int rc;
if (vc->vc_mode != KD_TEXT)
return -EINVAL;
acquire_console_sem();
if (!vc->vc_sw->con_font_copy)
rc = -ENOSYS;
else if (con < 0 || !vc_cons_allocated(con))
rc = -ENOTTY;
else if (con == vc->vc_num) /* nothing to do */
rc = 0;
else
rc = vc->vc_sw->con_font_copy(vc, con);
release_console_sem();
return rc;
}
int con_font_op(struct vc_data *vc, struct console_font_op *op)
{
switch (op->op) {
case KD_FONT_OP_SET:
return con_font_set(vc, op);
case KD_FONT_OP_GET:
return con_font_get(vc, op);
case KD_FONT_OP_SET_DEFAULT:
return con_font_default(vc, op);
case KD_FONT_OP_COPY:
return con_font_copy(vc, op);
}
return -ENOSYS;
}
/*
* Interface exported to selection and vcs.
*/
/* used by selection */
u16 screen_glyph(struct vc_data *vc, int offset)
{
u16 w = scr_readw(screenpos(vc, offset, 1));
u16 c = w & 0xff;
if (w & vc->vc_hi_font_mask)
c |= 0x100;
return c;
}
/* used by vcs - note the word offset */
unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
{
return screenpos(vc, 2 * w_offset, viewed);
}
void getconsxy(struct vc_data *vc, unsigned char *p)
{
p[0] = vc->vc_x;
p[1] = vc->vc_y;
}
void putconsxy(struct vc_data *vc, unsigned char *p)
{
[PATCH] fbcon: Fix screen artifacts when moving cursor When moving the cursor by writing to /dev/vcs*, the old cursor image is not erased. Fix by hiding the cursor first before moving the cursor to the new position. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-02-01 19:06:52 +08:00
hide_cursor(vc);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
gotoxy(vc, p[0], p[1]);
set_cursor(vc);
}
u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
{
if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
return softcursor_original;
return scr_readw(org);
}
void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
{
scr_writew(val, org);
if ((unsigned long)org == vc->vc_pos) {
softcursor_original = -1;
add_softcursor(vc);
}
}
/*
* Visible symbols for modules
*/
EXPORT_SYMBOL(color_table);
EXPORT_SYMBOL(default_red);
EXPORT_SYMBOL(default_grn);
EXPORT_SYMBOL(default_blu);
EXPORT_SYMBOL(update_region);
EXPORT_SYMBOL(redraw_screen);
EXPORT_SYMBOL(vc_resize);
EXPORT_SYMBOL(fg_console);
EXPORT_SYMBOL(console_blank_hook);
EXPORT_SYMBOL(console_blanked);
EXPORT_SYMBOL(vc_cons);
#ifndef VT_SINGLE_DRIVER
EXPORT_SYMBOL(take_over_console);
EXPORT_SYMBOL(give_up_console);
#endif