2005-04-17 06:20:36 +08:00
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|
|
/*
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* misc.c
|
2008-01-30 20:33:38 +08:00
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*
|
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|
|
* This is a collection of several routines from gzip-1.0.3
|
2005-04-17 06:20:36 +08:00
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* adapted for Linux.
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*
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* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
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* puts by Nick Holloway 1993, better puts by Martin Mares 1995
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* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
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|
|
*/
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|
2010-08-03 07:21:22 +08:00
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#include "misc.h"
|
2006-12-07 09:14:04 +08:00
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|
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/* WARNING!!
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|
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* This code is compiled with -fPIC and it is relocated dynamically
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* at run time, but no relocation processing is performed.
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* This means that it is not safe to place pointers in static structures.
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*/
|
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|
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/*
|
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|
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* Getting to provable safe in place decompression is hard.
|
2007-10-20 07:13:56 +08:00
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* Worst case behaviours need to be analyzed.
|
2006-12-07 09:14:04 +08:00
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* Background information:
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*
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* The file layout is:
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|
|
* magic[2]
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|
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* method[1]
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* flags[1]
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* timestamp[4]
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* extraflags[1]
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|
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* os[1]
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|
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* compressed data blocks[N]
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* crc[4] orig_len[4]
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*
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* resulting in 18 bytes of non compressed data overhead.
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*
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* Files divided into blocks
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* 1 bit (last block flag)
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* 2 bits (block type)
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*
|
2008-02-21 12:03:48 +08:00
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* 1 block occurs every 32K -1 bytes or when there 50% compression
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|
* has been achieved. The smallest block type encoding is always used.
|
2006-12-07 09:14:04 +08:00
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*
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* stored:
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* 32 bits length in bytes.
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*
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* fixed:
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* magic fixed tree.
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* symbols.
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*
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* dynamic:
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* dynamic tree encoding.
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* symbols.
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*
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*
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* The buffer for decompression in place is the length of the
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|
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* uncompressed data, plus a small amount extra to keep the algorithm safe.
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|
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* The compressed data is placed at the end of the buffer. The output
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|
|
* pointer is placed at the start of the buffer and the input pointer
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|
|
* is placed where the compressed data starts. Problems will occur
|
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|
|
* when the output pointer overruns the input pointer.
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*
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|
|
* The output pointer can only overrun the input pointer if the input
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|
|
* pointer is moving faster than the output pointer. A condition only
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|
|
* triggered by data whose compressed form is larger than the uncompressed
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|
|
* form.
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*
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* The worst case at the block level is a growth of the compressed data
|
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|
|
* of 5 bytes per 32767 bytes.
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*
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|
|
* The worst case internal to a compressed block is very hard to figure.
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|
|
* The worst case can at least be boundined by having one bit that represents
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|
|
* 32764 bytes and then all of the rest of the bytes representing the very
|
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|
|
* very last byte.
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|
*
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|
* All of which is enough to compute an amount of extra data that is required
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|
|
* to be safe. To avoid problems at the block level allocating 5 extra bytes
|
2008-02-21 12:03:48 +08:00
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|
* per 32767 bytes of data is sufficient. To avoind problems internal to a
|
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|
|
* block adding an extra 32767 bytes (the worst case uncompressed block size)
|
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|
|
* is sufficient, to ensure that in the worst case the decompressed data for
|
2006-12-07 09:14:04 +08:00
|
|
|
* block will stop the byte before the compressed data for a block begins.
|
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|
|
* To avoid problems with the compressed data's meta information an extra 18
|
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|
|
* bytes are needed. Leading to the formula:
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|
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*
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|
|
* extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size.
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|
*
|
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|
|
* Adding 8 bytes per 32K is a bit excessive but much easier to calculate.
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|
|
* Adding 32768 instead of 32767 just makes for round numbers.
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|
|
* Adding the decompressor_size is necessary as it musht live after all
|
|
|
|
* of the data as well. Last I measured the decompressor is about 14K.
|
2007-10-20 07:13:56 +08:00
|
|
|
* 10K of actual data and 4K of bss.
|
2006-12-07 09:14:04 +08:00
|
|
|
*
|
|
|
|
*/
|
2005-04-17 06:20:36 +08:00
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|
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|
|
/*
|
|
|
|
* gzip declarations
|
|
|
|
*/
|
2008-02-21 12:03:48 +08:00
|
|
|
#define STATIC static
|
2005-04-17 06:20:36 +08:00
|
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|
|
#undef memset
|
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|
|
#undef memcpy
|
2008-02-21 12:03:48 +08:00
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|
|
#define memzero(s, n) memset((s), 0, (n))
|
2005-04-17 06:20:36 +08:00
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|
static void error(char *m);
|
2008-02-21 07:19:10 +08:00
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|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
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|
|
* This is set up by the setup-routine at boot-time
|
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|
|
*/
|
2010-08-03 07:21:22 +08:00
|
|
|
struct boot_params *real_mode; /* Pointer to real-mode data */
|
2008-05-30 06:31:15 +08:00
|
|
|
static int quiet;
|
2010-08-03 07:21:22 +08:00
|
|
|
static int debug;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2010-02-05 22:37:07 +08:00
|
|
|
void *memset(void *s, int c, size_t n);
|
|
|
|
void *memcpy(void *dest, const void *src, size_t n);
|
2006-06-26 19:57:53 +08:00
|
|
|
|
2008-01-30 20:33:38 +08:00
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
#define memptr long
|
|
|
|
#else
|
|
|
|
#define memptr unsigned
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static memptr free_mem_ptr;
|
|
|
|
static memptr free_mem_end_ptr;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-04-06 20:47:00 +08:00
|
|
|
static char *vidmem;
|
2005-04-17 06:20:36 +08:00
|
|
|
static int vidport;
|
|
|
|
static int lines, cols;
|
|
|
|
|
2009-01-05 05:46:17 +08:00
|
|
|
#ifdef CONFIG_KERNEL_GZIP
|
|
|
|
#include "../../../../lib/decompress_inflate.c"
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_KERNEL_BZIP2
|
|
|
|
#include "../../../../lib/decompress_bunzip2.c"
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_KERNEL_LZMA
|
|
|
|
#include "../../../../lib/decompress_unlzma.c"
|
|
|
|
#endif
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2010-01-09 06:42:45 +08:00
|
|
|
#ifdef CONFIG_KERNEL_LZO
|
|
|
|
#include "../../../../lib/decompress_unlzo.c"
|
|
|
|
#endif
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
static void scroll(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
2008-02-21 07:19:10 +08:00
|
|
|
memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
|
|
|
|
for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
|
2005-04-17 06:20:36 +08:00
|
|
|
vidmem[i] = ' ';
|
|
|
|
}
|
|
|
|
|
2010-08-03 07:21:22 +08:00
|
|
|
#define XMTRDY 0x20
|
|
|
|
|
|
|
|
#define TXR 0 /* Transmit register (WRITE) */
|
|
|
|
#define LSR 5 /* Line Status */
|
|
|
|
static void serial_putchar(int ch)
|
|
|
|
{
|
|
|
|
unsigned timeout = 0xffff;
|
|
|
|
|
|
|
|
while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
|
|
|
|
cpu_relax();
|
|
|
|
|
|
|
|
outb(ch, early_serial_base + TXR);
|
|
|
|
}
|
|
|
|
|
|
|
|
void __putstr(int error, const char *s)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2008-02-21 07:19:10 +08:00
|
|
|
int x, y, pos;
|
2005-04-17 06:20:36 +08:00
|
|
|
char c;
|
|
|
|
|
2008-06-19 02:04:35 +08:00
|
|
|
#ifndef CONFIG_X86_VERBOSE_BOOTUP
|
|
|
|
if (!error)
|
|
|
|
return;
|
|
|
|
#endif
|
2010-08-03 07:21:22 +08:00
|
|
|
if (early_serial_base) {
|
|
|
|
const char *str = s;
|
|
|
|
while (*str) {
|
|
|
|
if (*str == '\n')
|
|
|
|
serial_putchar('\r');
|
|
|
|
serial_putchar(*str++);
|
|
|
|
}
|
|
|
|
}
|
2008-06-19 02:04:35 +08:00
|
|
|
|
2008-05-30 06:31:14 +08:00
|
|
|
if (real_mode->screen_info.orig_video_mode == 0 &&
|
|
|
|
lines == 0 && cols == 0)
|
2007-10-22 07:41:35 +08:00
|
|
|
return;
|
|
|
|
|
2008-05-30 06:31:14 +08:00
|
|
|
x = real_mode->screen_info.orig_x;
|
|
|
|
y = real_mode->screen_info.orig_y;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-02-21 07:19:10 +08:00
|
|
|
while ((c = *s++) != '\0') {
|
|
|
|
if (c == '\n') {
|
2005-04-17 06:20:36 +08:00
|
|
|
x = 0;
|
2008-02-21 07:19:10 +08:00
|
|
|
if (++y >= lines) {
|
2005-04-17 06:20:36 +08:00
|
|
|
scroll();
|
|
|
|
y--;
|
|
|
|
}
|
|
|
|
} else {
|
2008-08-03 03:23:36 +08:00
|
|
|
vidmem[(x + cols * y) * 2] = c;
|
2008-02-21 07:19:10 +08:00
|
|
|
if (++x >= cols) {
|
2005-04-17 06:20:36 +08:00
|
|
|
x = 0;
|
2008-02-21 07:19:10 +08:00
|
|
|
if (++y >= lines) {
|
2005-04-17 06:20:36 +08:00
|
|
|
scroll();
|
|
|
|
y--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-05-30 06:31:14 +08:00
|
|
|
real_mode->screen_info.orig_x = x;
|
|
|
|
real_mode->screen_info.orig_y = y;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
pos = (x + cols * y) * 2; /* Update cursor position */
|
2008-01-30 20:30:05 +08:00
|
|
|
outb(14, vidport);
|
|
|
|
outb(0xff & (pos >> 9), vidport+1);
|
|
|
|
outb(15, vidport);
|
|
|
|
outb(0xff & (pos >> 1), vidport+1);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2010-02-05 22:37:07 +08:00
|
|
|
void *memset(void *s, int c, size_t n)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
int i;
|
2008-01-30 20:33:23 +08:00
|
|
|
char *ss = s;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-08-03 03:23:36 +08:00
|
|
|
for (i = 0; i < n; i++)
|
|
|
|
ss[i] = c;
|
2005-04-17 06:20:36 +08:00
|
|
|
return s;
|
|
|
|
}
|
|
|
|
|
2010-02-05 22:37:07 +08:00
|
|
|
void *memcpy(void *dest, const void *src, size_t n)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
int i;
|
2008-01-30 20:33:23 +08:00
|
|
|
const char *s = src;
|
|
|
|
char *d = dest;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-08-03 03:23:36 +08:00
|
|
|
for (i = 0; i < n; i++)
|
|
|
|
d[i] = s[i];
|
2006-06-26 19:57:53 +08:00
|
|
|
return dest;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void error(char *x)
|
|
|
|
{
|
2008-06-19 02:04:35 +08:00
|
|
|
__putstr(1, "\n\n");
|
|
|
|
__putstr(1, x);
|
|
|
|
__putstr(1, "\n\n -- System halted");
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-01-30 20:32:31 +08:00
|
|
|
while (1)
|
|
|
|
asm("hlt");
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2008-02-14 04:54:58 +08:00
|
|
|
static void parse_elf(void *output)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
Elf64_Ehdr ehdr;
|
|
|
|
Elf64_Phdr *phdrs, *phdr;
|
|
|
|
#else
|
|
|
|
Elf32_Ehdr ehdr;
|
|
|
|
Elf32_Phdr *phdrs, *phdr;
|
|
|
|
#endif
|
|
|
|
void *dest;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
memcpy(&ehdr, output, sizeof(ehdr));
|
2008-02-21 07:19:10 +08:00
|
|
|
if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
|
2008-02-14 04:54:58 +08:00
|
|
|
ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
|
|
|
|
ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
|
2008-02-21 07:19:10 +08:00
|
|
|
ehdr.e_ident[EI_MAG3] != ELFMAG3) {
|
2008-02-14 04:54:58 +08:00
|
|
|
error("Kernel is not a valid ELF file");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2008-05-30 06:31:15 +08:00
|
|
|
if (!quiet)
|
|
|
|
putstr("Parsing ELF... ");
|
2008-02-14 04:54:58 +08:00
|
|
|
|
|
|
|
phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
|
|
|
|
if (!phdrs)
|
|
|
|
error("Failed to allocate space for phdrs");
|
|
|
|
|
|
|
|
memcpy(phdrs, output + ehdr.e_phoff, sizeof(*phdrs) * ehdr.e_phnum);
|
|
|
|
|
2008-02-21 07:19:10 +08:00
|
|
|
for (i = 0; i < ehdr.e_phnum; i++) {
|
2008-02-14 04:54:58 +08:00
|
|
|
phdr = &phdrs[i];
|
|
|
|
|
|
|
|
switch (phdr->p_type) {
|
|
|
|
case PT_LOAD:
|
|
|
|
#ifdef CONFIG_RELOCATABLE
|
|
|
|
dest = output;
|
|
|
|
dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
|
|
|
|
#else
|
2008-02-21 07:19:10 +08:00
|
|
|
dest = (void *)(phdr->p_paddr);
|
2008-02-14 04:54:58 +08:00
|
|
|
#endif
|
|
|
|
memcpy(dest,
|
|
|
|
output + phdr->p_offset,
|
|
|
|
phdr->p_filesz);
|
|
|
|
break;
|
|
|
|
default: /* Ignore other PT_* */ break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-01-30 20:33:38 +08:00
|
|
|
asmlinkage void decompress_kernel(void *rmode, memptr heap,
|
2008-02-21 12:03:48 +08:00
|
|
|
unsigned char *input_data,
|
|
|
|
unsigned long input_len,
|
|
|
|
unsigned char *output)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
real_mode = rmode;
|
|
|
|
|
2010-08-03 07:21:22 +08:00
|
|
|
if (cmdline_find_option_bool("quiet"))
|
2008-05-30 06:31:15 +08:00
|
|
|
quiet = 1;
|
2010-08-03 07:21:22 +08:00
|
|
|
if (cmdline_find_option_bool("debug"))
|
|
|
|
debug = 1;
|
2008-05-30 06:31:15 +08:00
|
|
|
|
2008-05-30 06:31:14 +08:00
|
|
|
if (real_mode->screen_info.orig_video_mode == 7) {
|
2005-04-17 06:20:36 +08:00
|
|
|
vidmem = (char *) 0xb0000;
|
|
|
|
vidport = 0x3b4;
|
|
|
|
} else {
|
|
|
|
vidmem = (char *) 0xb8000;
|
|
|
|
vidport = 0x3d4;
|
|
|
|
}
|
|
|
|
|
2008-05-30 06:31:14 +08:00
|
|
|
lines = real_mode->screen_info.orig_video_lines;
|
|
|
|
cols = real_mode->screen_info.orig_video_cols;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2010-08-03 07:21:22 +08:00
|
|
|
console_init();
|
|
|
|
if (debug)
|
|
|
|
putstr("early console in decompress_kernel\n");
|
|
|
|
|
2008-01-30 20:33:38 +08:00
|
|
|
free_mem_ptr = heap; /* Heap */
|
2008-04-08 18:54:30 +08:00
|
|
|
free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
|
2006-12-07 09:14:04 +08:00
|
|
|
|
2009-05-13 02:33:08 +08:00
|
|
|
if ((unsigned long)output & (MIN_KERNEL_ALIGN - 1))
|
|
|
|
error("Destination address inappropriately aligned");
|
2008-01-30 20:33:38 +08:00
|
|
|
#ifdef CONFIG_X86_64
|
2009-05-13 02:33:08 +08:00
|
|
|
if (heap > 0x3fffffffffffUL)
|
2008-01-30 20:33:38 +08:00
|
|
|
error("Destination address too large");
|
|
|
|
#else
|
2008-01-30 20:33:38 +08:00
|
|
|
if (heap > ((-__PAGE_OFFSET-(512<<20)-1) & 0x7fffffff))
|
2006-12-07 09:14:04 +08:00
|
|
|
error("Destination address too large");
|
2009-05-13 02:33:08 +08:00
|
|
|
#endif
|
2006-12-07 09:14:04 +08:00
|
|
|
#ifndef CONFIG_RELOCATABLE
|
2009-05-13 02:33:08 +08:00
|
|
|
if ((unsigned long)output != LOAD_PHYSICAL_ADDR)
|
2006-12-07 09:14:04 +08:00
|
|
|
error("Wrong destination address");
|
|
|
|
#endif
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-05-30 06:31:15 +08:00
|
|
|
if (!quiet)
|
|
|
|
putstr("\nDecompressing Linux... ");
|
2009-01-05 05:46:17 +08:00
|
|
|
decompress(input_data, input_len, NULL, NULL, output, NULL, error);
|
2008-02-14 04:54:58 +08:00
|
|
|
parse_elf(output);
|
2008-05-30 06:31:15 +08:00
|
|
|
if (!quiet)
|
|
|
|
putstr("done.\nBooting the kernel.\n");
|
2006-12-07 09:14:04 +08:00
|
|
|
return;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|