398 lines
10 KiB
C
398 lines
10 KiB
C
/*
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* PARISC Architecture-dependent parts of process handling
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* based on the work for i386
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*
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* Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
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* Copyright (C) 2000 Martin K Petersen <mkp at mkp.net>
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* Copyright (C) 2000 John Marvin <jsm at parisc-linux.org>
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* Copyright (C) 2000 David Huggins-Daines <dhd with pobox.org>
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* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
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* Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org>
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* Copyright (C) 2000 David Kennedy <dkennedy with linuxcare.com>
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* Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org>
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* Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org>
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* Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org>
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* Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org>
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* Copyright (C) 2001-2002 Helge Deller <deller at parisc-linux.org>
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* Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdarg.h>
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#include <linux/elf.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/personality.h>
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#include <linux/ptrace.h>
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#include <linux/sched.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/kallsyms.h>
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#include <asm/io.h>
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#include <asm/asm-offsets.h>
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#include <asm/pdc.h>
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#include <asm/pdc_chassis.h>
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#include <asm/pgalloc.h>
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#include <asm/uaccess.h>
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#include <asm/unwind.h>
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/*
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* The idle thread. There's no useful work to be
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* done, so just try to conserve power and have a
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* low exit latency (ie sit in a loop waiting for
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* somebody to say that they'd like to reschedule)
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*/
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void cpu_idle(void)
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{
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set_thread_flag(TIF_POLLING_NRFLAG);
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/* endless idle loop with no priority at all */
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while (1) {
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while (!need_resched())
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barrier();
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preempt_enable_no_resched();
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schedule();
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preempt_disable();
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check_pgt_cache();
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}
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}
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#define COMMAND_GLOBAL F_EXTEND(0xfffe0030)
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#define CMD_RESET 5 /* reset any module */
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/*
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** The Wright Brothers and Gecko systems have a H/W problem
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** (Lasi...'nuf said) may cause a broadcast reset to lockup
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** the system. An HVERSION dependent PDC call was developed
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** to perform a "safe", platform specific broadcast reset instead
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** of kludging up all the code.
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**
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** Older machines which do not implement PDC_BROADCAST_RESET will
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** return (with an error) and the regular broadcast reset can be
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** issued. Obviously, if the PDC does implement PDC_BROADCAST_RESET
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** the PDC call will not return (the system will be reset).
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*/
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void machine_restart(char *cmd)
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{
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#ifdef FASTBOOT_SELFTEST_SUPPORT
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/*
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** If user has modified the Firmware Selftest Bitmap,
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** run the tests specified in the bitmap after the
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** system is rebooted w/PDC_DO_RESET.
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**
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** ftc_bitmap = 0x1AUL "Skip destructive memory tests"
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**
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** Using "directed resets" at each processor with the MEM_TOC
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** vector cleared will also avoid running destructive
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** memory self tests. (Not implemented yet)
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*/
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if (ftc_bitmap) {
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pdc_do_firm_test_reset(ftc_bitmap);
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}
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#endif
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/* set up a new led state on systems shipped with a LED State panel */
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pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
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/* "Normal" system reset */
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pdc_do_reset();
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/* Nope...box should reset with just CMD_RESET now */
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gsc_writel(CMD_RESET, COMMAND_GLOBAL);
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/* Wait for RESET to lay us to rest. */
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while (1) ;
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}
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void machine_halt(void)
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{
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/*
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** The LED/ChassisCodes are updated by the led_halt()
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** function, called by the reboot notifier chain.
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*/
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}
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void (*chassis_power_off)(void);
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/*
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* This routine is called from sys_reboot to actually turn off the
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* machine
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*/
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void machine_power_off(void)
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{
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/* If there is a registered power off handler, call it. */
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if (chassis_power_off)
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chassis_power_off();
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/* Put the soft power button back under hardware control.
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* If the user had already pressed the power button, the
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* following call will immediately power off. */
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pdc_soft_power_button(0);
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pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
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/* It seems we have no way to power the system off via
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* software. The user has to press the button himself. */
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printk(KERN_EMERG "System shut down completed.\n"
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KERN_EMERG "Please power this system off now.");
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}
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void (*pm_power_off)(void) = machine_power_off;
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EXPORT_SYMBOL(pm_power_off);
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/*
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* Create a kernel thread
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*/
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extern pid_t __kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
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{
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/*
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* FIXME: Once we are sure we don't need any debug here,
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* kernel_thread can become a #define.
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*/
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return __kernel_thread(fn, arg, flags);
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}
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EXPORT_SYMBOL(kernel_thread);
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/*
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* Free current thread data structures etc..
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*/
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void exit_thread(void)
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{
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}
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void flush_thread(void)
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{
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/* Only needs to handle fpu stuff or perf monitors.
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** REVISIT: several arches implement a "lazy fpu state".
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*/
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set_fs(USER_DS);
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}
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void release_thread(struct task_struct *dead_task)
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{
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}
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/*
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* Fill in the FPU structure for a core dump.
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*/
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int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r)
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{
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if (regs == NULL)
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return 0;
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memcpy(r, regs->fr, sizeof *r);
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return 1;
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}
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int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r)
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{
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memcpy(r, tsk->thread.regs.fr, sizeof(*r));
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return 1;
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}
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/* Note that "fork()" is implemented in terms of clone, with
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parameters (SIGCHLD, regs->gr[30], regs). */
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int
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sys_clone(unsigned long clone_flags, unsigned long usp,
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struct pt_regs *regs)
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{
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/* Arugments from userspace are:
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r26 = Clone flags.
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r25 = Child stack.
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r24 = parent_tidptr.
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r23 = Is the TLS storage descriptor
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r22 = child_tidptr
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However, these last 3 args are only examined
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if the proper flags are set. */
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int __user *child_tidptr;
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int __user *parent_tidptr;
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/* usp must be word aligned. This also prevents users from
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* passing in the value 1 (which is the signal for a special
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* return for a kernel thread) */
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usp = ALIGN(usp, 4);
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/* A zero value for usp means use the current stack */
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if (usp == 0)
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usp = regs->gr[30];
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if (clone_flags & CLONE_PARENT_SETTID)
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parent_tidptr = (int __user *)regs->gr[24];
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else
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parent_tidptr = NULL;
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if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID))
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child_tidptr = (int __user *)regs->gr[22];
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else
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child_tidptr = NULL;
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return do_fork(clone_flags, usp, regs, 0, parent_tidptr, child_tidptr);
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}
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int
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sys_vfork(struct pt_regs *regs)
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{
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return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gr[30], regs, 0, NULL, NULL);
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}
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int
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copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
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unsigned long unused, /* in ia64 this is "user_stack_size" */
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struct task_struct * p, struct pt_regs * pregs)
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{
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struct pt_regs * cregs = &(p->thread.regs);
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void *stack = task_stack_page(p);
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/* We have to use void * instead of a function pointer, because
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* function pointers aren't a pointer to the function on 64-bit.
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* Make them const so the compiler knows they live in .text */
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extern void * const ret_from_kernel_thread;
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extern void * const child_return;
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#ifdef CONFIG_HPUX
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extern void * const hpux_child_return;
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#endif
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*cregs = *pregs;
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/* Set the return value for the child. Note that this is not
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actually restored by the syscall exit path, but we put it
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here for consistency in case of signals. */
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cregs->gr[28] = 0; /* child */
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/*
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* We need to differentiate between a user fork and a
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* kernel fork. We can't use user_mode, because the
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* the syscall path doesn't save iaoq. Right now
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* We rely on the fact that kernel_thread passes
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* in zero for usp.
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*/
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if (usp == 1) {
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/* kernel thread */
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cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN;
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/* Must exit via ret_from_kernel_thread in order
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* to call schedule_tail()
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*/
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cregs->kpc = (unsigned long) &ret_from_kernel_thread;
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/*
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* Copy function and argument to be called from
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* ret_from_kernel_thread.
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*/
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#ifdef __LP64__
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cregs->gr[27] = pregs->gr[27];
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#endif
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cregs->gr[26] = pregs->gr[26];
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cregs->gr[25] = pregs->gr[25];
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} else {
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/* user thread */
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/*
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* Note that the fork wrappers are responsible
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* for setting gr[21].
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*/
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/* Use same stack depth as parent */
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cregs->ksp = (unsigned long)stack
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+ (pregs->gr[21] & (THREAD_SIZE - 1));
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cregs->gr[30] = usp;
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if (p->personality == PER_HPUX) {
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#ifdef CONFIG_HPUX
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cregs->kpc = (unsigned long) &hpux_child_return;
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#else
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BUG();
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#endif
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} else {
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cregs->kpc = (unsigned long) &child_return;
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}
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/* Setup thread TLS area from the 4th parameter in clone */
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if (clone_flags & CLONE_SETTLS)
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cregs->cr27 = pregs->gr[23];
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}
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return 0;
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}
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unsigned long thread_saved_pc(struct task_struct *t)
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{
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return t->thread.regs.kpc;
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}
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/*
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* sys_execve() executes a new program.
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*/
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asmlinkage int sys_execve(struct pt_regs *regs)
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{
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int error;
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char *filename;
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filename = getname((const char __user *) regs->gr[26]);
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error = PTR_ERR(filename);
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if (IS_ERR(filename))
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goto out;
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error = do_execve(filename, (char __user **) regs->gr[25],
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(char __user **) regs->gr[24], regs);
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if (error == 0) {
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task_lock(current);
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current->ptrace &= ~PT_DTRACE;
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task_unlock(current);
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}
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putname(filename);
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out:
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return error;
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}
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extern int __execve(const char *filename, char *const argv[],
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char *const envp[], struct task_struct *task);
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int kernel_execve(const char *filename, char *const argv[], char *const envp[])
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{
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return __execve(filename, argv, envp, current);
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}
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unsigned long
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get_wchan(struct task_struct *p)
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{
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struct unwind_frame_info info;
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unsigned long ip;
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int count = 0;
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/*
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* These bracket the sleeping functions..
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*/
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unwind_frame_init_from_blocked_task(&info, p);
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do {
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if (unwind_once(&info) < 0)
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return 0;
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ip = info.ip;
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if (!in_sched_functions(ip))
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return ip;
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} while (count++ < 16);
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return 0;
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}
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