df2e71fb91
) From: Adrian Bunk <bunk@stusta.de> - create one common dump_thread() prototype in kernel.h - dump_thread() is only used in fs/binfmt_aout.c and can therefore be removed on all architectures where CONFIG_BINFMT_AOUT is not available Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
265 lines
6.9 KiB
C
265 lines
6.9 KiB
C
/* $Id: process.c,v 1.21 2005/03/04 08:16:17 starvik Exp $
|
|
*
|
|
* linux/arch/cris/kernel/process.c
|
|
*
|
|
* Copyright (C) 1995 Linus Torvalds
|
|
* Copyright (C) 2000-2002 Axis Communications AB
|
|
*
|
|
* Authors: Bjorn Wesen (bjornw@axis.com)
|
|
*
|
|
* $Log: process.c,v $
|
|
* Revision 1.21 2005/03/04 08:16:17 starvik
|
|
* Merge of Linux 2.6.11.
|
|
*
|
|
* Revision 1.20 2005/01/18 05:57:22 starvik
|
|
* Renamed hlt_counter to cris_hlt_counter and made it global.
|
|
*
|
|
* Revision 1.19 2004/10/19 13:07:43 starvik
|
|
* Merge of Linux 2.6.9
|
|
*
|
|
* Revision 1.18 2004/08/16 12:37:23 starvik
|
|
* Merge of Linux 2.6.8
|
|
*
|
|
* Revision 1.17 2004/04/05 13:53:48 starvik
|
|
* Merge of Linux 2.6.5
|
|
*
|
|
* Revision 1.16 2003/10/27 08:04:33 starvik
|
|
* Merge of Linux 2.6.0-test9
|
|
*
|
|
* Revision 1.15 2003/09/11 07:29:52 starvik
|
|
* Merge of Linux 2.6.0-test5
|
|
*
|
|
* Revision 1.14 2003/06/10 10:21:12 johana
|
|
* Moved thread_saved_pc() from arch/cris/kernel/process.c to
|
|
* subarch specific process.c. arch-v32 has an erp, no irp.
|
|
*
|
|
* Revision 1.13 2003/04/09 05:20:47 starvik
|
|
* Merge of Linux 2.5.67
|
|
*
|
|
* Revision 1.12 2002/12/11 15:41:11 starvik
|
|
* Extracted v10 (ETRAX 100LX) specific stuff to arch/cris/arch-v10/kernel
|
|
*
|
|
* Revision 1.11 2002/12/10 09:00:10 starvik
|
|
* Merge of Linux 2.5.51
|
|
*
|
|
* Revision 1.10 2002/11/27 08:42:34 starvik
|
|
* Argument to user_regs() is thread_info*
|
|
*
|
|
* Revision 1.9 2002/11/26 09:44:21 starvik
|
|
* New threads exits through ret_from_fork (necessary for preemptive scheduling)
|
|
*
|
|
* Revision 1.8 2002/11/19 14:35:24 starvik
|
|
* Changes from linux 2.4
|
|
* Changed struct initializer syntax to the currently prefered notation
|
|
*
|
|
* Revision 1.7 2002/11/18 07:39:42 starvik
|
|
* thread_saved_pc moved here from processor.h
|
|
*
|
|
* Revision 1.6 2002/11/14 06:51:27 starvik
|
|
* Made cpu_idle more similar with other archs
|
|
* init_task_union -> init_thread_union
|
|
* Updated for new interrupt macros
|
|
* sys_clone and do_fork have a new argument, user_tid
|
|
*
|
|
* Revision 1.5 2002/11/05 06:45:11 starvik
|
|
* Merge of Linux 2.5.45
|
|
*
|
|
* Revision 1.4 2002/02/05 15:37:44 bjornw
|
|
* Need init_task.h
|
|
*
|
|
* Revision 1.3 2002/01/21 15:22:49 bjornw
|
|
* current->counter is gone
|
|
*
|
|
* Revision 1.22 2001/11/13 09:40:43 orjanf
|
|
* Added dump_fpu (needed for core dumps).
|
|
*
|
|
* Revision 1.21 2001/11/12 18:26:21 pkj
|
|
* Fixed compiler warnings.
|
|
*
|
|
* Revision 1.20 2001/10/03 08:21:39 jonashg
|
|
* cause_of_death does not exist if CONFIG_SVINTO_SIM is defined.
|
|
*
|
|
* Revision 1.19 2001/09/26 11:52:54 bjornw
|
|
* INIT_MMAP is gone in 2.4.10
|
|
*
|
|
* Revision 1.18 2001/08/21 21:43:51 hp
|
|
* Move last watchdog fix inside #ifdef CONFIG_ETRAX_WATCHDOG
|
|
*
|
|
* Revision 1.17 2001/08/21 13:48:01 jonashg
|
|
* Added fix by HP to avoid oops when doing a hard_reset_now.
|
|
*
|
|
* Revision 1.16 2001/06/21 02:00:40 hp
|
|
* * entry.S: Include asm/unistd.h.
|
|
* (_sys_call_table): Use section .rodata, not .data.
|
|
* (_kernel_thread): Move from...
|
|
* * process.c: ... here.
|
|
* * entryoffsets.c (VAL): Break out from...
|
|
* (OF): Use VAL.
|
|
* (LCLONE_VM): New asmified value from CLONE_VM.
|
|
*
|
|
* Revision 1.15 2001/06/20 16:31:57 hp
|
|
* Add comments to describe empty functions according to review.
|
|
*
|
|
* Revision 1.14 2001/05/29 11:27:59 markusl
|
|
* Fixed so that hard_reset_now will do reset even if watchdog wasn't enabled
|
|
*
|
|
* Revision 1.13 2001/03/20 19:44:06 bjornw
|
|
* Use the 7th syscall argument for regs instead of current_regs
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* This file handles the architecture-dependent parts of process handling..
|
|
*/
|
|
|
|
#include <asm/atomic.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/irq.h>
|
|
#include <linux/module.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/fs_struct.h>
|
|
#include <linux/init_task.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/user.h>
|
|
#include <linux/elfcore.h>
|
|
#include <linux/mqueue.h>
|
|
#include <linux/reboot.h>
|
|
|
|
//#define DEBUG
|
|
|
|
/*
|
|
* Initial task structure. Make this a per-architecture thing,
|
|
* because different architectures tend to have different
|
|
* alignment requirements and potentially different initial
|
|
* setup.
|
|
*/
|
|
|
|
static struct fs_struct init_fs = INIT_FS;
|
|
static struct files_struct init_files = INIT_FILES;
|
|
static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
|
|
static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
|
|
struct mm_struct init_mm = INIT_MM(init_mm);
|
|
|
|
EXPORT_SYMBOL(init_mm);
|
|
|
|
/*
|
|
* Initial thread structure.
|
|
*
|
|
* We need to make sure that this is 8192-byte aligned due to the
|
|
* way process stacks are handled. This is done by having a special
|
|
* "init_task" linker map entry..
|
|
*/
|
|
union thread_union init_thread_union
|
|
__attribute__((__section__(".data.init_task"))) =
|
|
{ INIT_THREAD_INFO(init_task) };
|
|
|
|
/*
|
|
* Initial task structure.
|
|
*
|
|
* All other task structs will be allocated on slabs in fork.c
|
|
*/
|
|
struct task_struct init_task = INIT_TASK(init_task);
|
|
|
|
EXPORT_SYMBOL(init_task);
|
|
|
|
/*
|
|
* The hlt_counter, disable_hlt and enable_hlt is just here as a hook if
|
|
* there would ever be a halt sequence (for power save when idle) with
|
|
* some largish delay when halting or resuming *and* a driver that can't
|
|
* afford that delay. The hlt_counter would then be checked before
|
|
* executing the halt sequence, and the driver marks the unhaltable
|
|
* region by enable_hlt/disable_hlt.
|
|
*/
|
|
|
|
int cris_hlt_counter=0;
|
|
|
|
void disable_hlt(void)
|
|
{
|
|
cris_hlt_counter++;
|
|
}
|
|
|
|
EXPORT_SYMBOL(disable_hlt);
|
|
|
|
void enable_hlt(void)
|
|
{
|
|
cris_hlt_counter--;
|
|
}
|
|
|
|
EXPORT_SYMBOL(enable_hlt);
|
|
|
|
/*
|
|
* The following aren't currently used.
|
|
*/
|
|
void (*pm_idle)(void);
|
|
|
|
extern void default_idle(void);
|
|
|
|
/*
|
|
* The idle thread. There's no useful work to be
|
|
* done, so just try to conserve power and have a
|
|
* low exit latency (ie sit in a loop waiting for
|
|
* somebody to say that they'd like to reschedule)
|
|
*/
|
|
void cpu_idle (void)
|
|
{
|
|
/* endless idle loop with no priority at all */
|
|
while (1) {
|
|
while (!need_resched()) {
|
|
void (*idle)(void);
|
|
/*
|
|
* Mark this as an RCU critical section so that
|
|
* synchronize_kernel() in the unload path waits
|
|
* for our completion.
|
|
*/
|
|
idle = pm_idle;
|
|
if (!idle)
|
|
idle = default_idle;
|
|
idle();
|
|
}
|
|
preempt_enable_no_resched();
|
|
schedule();
|
|
preempt_disable();
|
|
}
|
|
}
|
|
|
|
void hard_reset_now (void);
|
|
|
|
void machine_restart(char *cmd)
|
|
{
|
|
hard_reset_now();
|
|
}
|
|
|
|
/*
|
|
* Similar to machine_power_off, but don't shut off power. Add code
|
|
* here to freeze the system for e.g. post-mortem debug purpose when
|
|
* possible. This halt has nothing to do with the idle halt.
|
|
*/
|
|
|
|
void machine_halt(void)
|
|
{
|
|
}
|
|
|
|
/* If or when software power-off is implemented, add code here. */
|
|
|
|
void machine_power_off(void)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* When a process does an "exec", machine state like FPU and debug
|
|
* registers need to be reset. This is a hook function for that.
|
|
* Currently we don't have any such state to reset, so this is empty.
|
|
*/
|
|
|
|
void flush_thread(void)
|
|
{
|
|
}
|
|
|
|
/* Fill in the fpu structure for a core dump. */
|
|
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
|
|
{
|
|
return 0;
|
|
}
|