5d01e6ce78
Patches to make CRIS work with 2.6.12. Signed-off-by: Mikael Starvik <starvik@axis.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
291 lines
7.7 KiB
C
291 lines
7.7 KiB
C
/* $Id: process.c,v 1.21 2005/03/04 08:16:17 starvik Exp $
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*
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* linux/arch/cris/kernel/process.c
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*
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* Copyright (C) 1995 Linus Torvalds
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* Copyright (C) 2000-2002 Axis Communications AB
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*
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* Authors: Bjorn Wesen (bjornw@axis.com)
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*
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* $Log: process.c,v $
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* Revision 1.21 2005/03/04 08:16:17 starvik
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* Merge of Linux 2.6.11.
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*
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* Revision 1.20 2005/01/18 05:57:22 starvik
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* Renamed hlt_counter to cris_hlt_counter and made it global.
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*
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* Revision 1.19 2004/10/19 13:07:43 starvik
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* Merge of Linux 2.6.9
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*
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* Revision 1.18 2004/08/16 12:37:23 starvik
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* Merge of Linux 2.6.8
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*
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* Revision 1.17 2004/04/05 13:53:48 starvik
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* Merge of Linux 2.6.5
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*
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* Revision 1.16 2003/10/27 08:04:33 starvik
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* Merge of Linux 2.6.0-test9
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*
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* Revision 1.15 2003/09/11 07:29:52 starvik
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* Merge of Linux 2.6.0-test5
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*
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* Revision 1.14 2003/06/10 10:21:12 johana
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* Moved thread_saved_pc() from arch/cris/kernel/process.c to
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* subarch specific process.c. arch-v32 has an erp, no irp.
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*
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* Revision 1.13 2003/04/09 05:20:47 starvik
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* Merge of Linux 2.5.67
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*
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* Revision 1.12 2002/12/11 15:41:11 starvik
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* Extracted v10 (ETRAX 100LX) specific stuff to arch/cris/arch-v10/kernel
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*
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* Revision 1.11 2002/12/10 09:00:10 starvik
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* Merge of Linux 2.5.51
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*
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* Revision 1.10 2002/11/27 08:42:34 starvik
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* Argument to user_regs() is thread_info*
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*
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* Revision 1.9 2002/11/26 09:44:21 starvik
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* New threads exits through ret_from_fork (necessary for preemptive scheduling)
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*
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* Revision 1.8 2002/11/19 14:35:24 starvik
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* Changes from linux 2.4
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* Changed struct initializer syntax to the currently prefered notation
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*
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* Revision 1.7 2002/11/18 07:39:42 starvik
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* thread_saved_pc moved here from processor.h
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*
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* Revision 1.6 2002/11/14 06:51:27 starvik
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* Made cpu_idle more similar with other archs
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* init_task_union -> init_thread_union
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* Updated for new interrupt macros
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* sys_clone and do_fork have a new argument, user_tid
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*
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* Revision 1.5 2002/11/05 06:45:11 starvik
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* Merge of Linux 2.5.45
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*
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* Revision 1.4 2002/02/05 15:37:44 bjornw
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* Need init_task.h
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*
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* Revision 1.3 2002/01/21 15:22:49 bjornw
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* current->counter is gone
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*
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* Revision 1.22 2001/11/13 09:40:43 orjanf
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* Added dump_fpu (needed for core dumps).
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*
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* Revision 1.21 2001/11/12 18:26:21 pkj
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* Fixed compiler warnings.
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*
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* Revision 1.20 2001/10/03 08:21:39 jonashg
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* cause_of_death does not exist if CONFIG_SVINTO_SIM is defined.
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*
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* Revision 1.19 2001/09/26 11:52:54 bjornw
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* INIT_MMAP is gone in 2.4.10
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*
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* Revision 1.18 2001/08/21 21:43:51 hp
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* Move last watchdog fix inside #ifdef CONFIG_ETRAX_WATCHDOG
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*
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* Revision 1.17 2001/08/21 13:48:01 jonashg
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* Added fix by HP to avoid oops when doing a hard_reset_now.
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*
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* Revision 1.16 2001/06/21 02:00:40 hp
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* * entry.S: Include asm/unistd.h.
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* (_sys_call_table): Use section .rodata, not .data.
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* (_kernel_thread): Move from...
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* * process.c: ... here.
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* * entryoffsets.c (VAL): Break out from...
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* (OF): Use VAL.
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* (LCLONE_VM): New asmified value from CLONE_VM.
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*
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* Revision 1.15 2001/06/20 16:31:57 hp
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* Add comments to describe empty functions according to review.
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*
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* Revision 1.14 2001/05/29 11:27:59 markusl
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* Fixed so that hard_reset_now will do reset even if watchdog wasn't enabled
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*
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* Revision 1.13 2001/03/20 19:44:06 bjornw
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* Use the 7th syscall argument for regs instead of current_regs
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*
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*/
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/*
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* This file handles the architecture-dependent parts of process handling..
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*/
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#include <asm/atomic.h>
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#include <asm/pgtable.h>
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#include <asm/uaccess.h>
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#include <asm/irq.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/fs_struct.h>
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#include <linux/init_task.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/user.h>
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#include <linux/elfcore.h>
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#include <linux/mqueue.h>
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#include <linux/reboot.h>
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//#define DEBUG
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/*
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* Initial task structure. Make this a per-architecture thing,
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* because different architectures tend to have different
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* alignment requirements and potentially different initial
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* setup.
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*/
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static struct fs_struct init_fs = INIT_FS;
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static struct files_struct init_files = INIT_FILES;
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static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
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static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
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struct mm_struct init_mm = INIT_MM(init_mm);
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EXPORT_SYMBOL(init_mm);
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/*
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* Initial thread structure.
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*
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* We need to make sure that this is 8192-byte aligned due to the
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* way process stacks are handled. This is done by having a special
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* "init_task" linker map entry..
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*/
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union thread_union init_thread_union
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__attribute__((__section__(".data.init_task"))) =
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{ INIT_THREAD_INFO(init_task) };
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/*
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* Initial task structure.
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*
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* All other task structs will be allocated on slabs in fork.c
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*/
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struct task_struct init_task = INIT_TASK(init_task);
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EXPORT_SYMBOL(init_task);
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/*
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* The hlt_counter, disable_hlt and enable_hlt is just here as a hook if
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* there would ever be a halt sequence (for power save when idle) with
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* some largish delay when halting or resuming *and* a driver that can't
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* afford that delay. The hlt_counter would then be checked before
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* executing the halt sequence, and the driver marks the unhaltable
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* region by enable_hlt/disable_hlt.
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*/
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int cris_hlt_counter=0;
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void disable_hlt(void)
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{
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cris_hlt_counter++;
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}
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EXPORT_SYMBOL(disable_hlt);
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void enable_hlt(void)
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{
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cris_hlt_counter--;
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}
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EXPORT_SYMBOL(enable_hlt);
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/*
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* The following aren't currently used.
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*/
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void (*pm_idle)(void);
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extern void default_idle(void);
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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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/* 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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void (*idle)(void);
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/*
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* Mark this as an RCU critical section so that
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* synchronize_kernel() in the unload path waits
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* for our completion.
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*/
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idle = pm_idle;
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if (!idle)
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idle = default_idle;
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idle();
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}
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schedule();
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}
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}
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void hard_reset_now (void);
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void machine_restart(char *cmd)
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{
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hard_reset_now();
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}
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/*
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* Similar to machine_power_off, but don't shut off power. Add code
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* here to freeze the system for e.g. post-mortem debug purpose when
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* possible. This halt has nothing to do with the idle halt.
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*/
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void machine_halt(void)
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{
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}
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/* If or when software power-off is implemented, add code here. */
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void machine_power_off(void)
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{
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}
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/*
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* When a process does an "exec", machine state like FPU and debug
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* registers need to be reset. This is a hook function for that.
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* Currently we don't have any such state to reset, so this is empty.
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*/
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void flush_thread(void)
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{
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}
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/*
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* fill in the user structure for a core dump..
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*/
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void dump_thread(struct pt_regs * regs, struct user * dump)
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{
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#if 0
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int i;
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/* changed the size calculations - should hopefully work better. lbt */
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dump->magic = CMAGIC;
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dump->start_code = 0;
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dump->start_stack = regs->esp & ~(PAGE_SIZE - 1);
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dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
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dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
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dump->u_dsize -= dump->u_tsize;
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dump->u_ssize = 0;
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for (i = 0; i < 8; i++)
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dump->u_debugreg[i] = current->debugreg[i];
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if (dump->start_stack < TASK_SIZE)
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dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;
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dump->regs = *regs;
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dump->u_fpvalid = dump_fpu (regs, &dump->i387);
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#endif
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}
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/* Fill in the fpu structure for a core dump. */
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int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
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{
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return 0;
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}
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