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Diffstat (limited to 'arch/cris/kernel/process.c')
| -rw-r--r-- | arch/cris/kernel/process.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/arch/cris/kernel/process.c b/arch/cris/kernel/process.c new file mode 100644 index 00000000000..9f7cad7c784 --- /dev/null +++ b/arch/cris/kernel/process.c @@ -0,0 +1,280 @@ +/* $Id: process.c,v 1.17 2004/04/05 13:53:48 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 1.17 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> + +//#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. + */ + +static int hlt_counter=0; + +void disable_hlt(void) +{ + hlt_counter++; +} + +EXPORT_SYMBOL(disable_hlt); + +void enable_hlt(void) +{ + 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) = pm_idle; + + if (!idle) + idle = default_idle; + + idle(); + } + schedule(); + } + +} + +void hard_reset_now (void); + +void machine_restart(void) +{ + hard_reset_now(); +} + +EXPORT_SYMBOL(machine_restart); + +/* + * 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) +{ +} + +EXPORT_SYMBOL(machine_halt); + +/* If or when software power-off is implemented, add code here. */ + +void machine_power_off(void) +{ +} + +EXPORT_SYMBOL(machine_power_off); + +/* + * 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 user structure for a core dump.. + */ +void dump_thread(struct pt_regs * regs, struct user * dump) +{ +#if 0 + int i; + + /* changed the size calculations - should hopefully work better. lbt */ + dump->magic = CMAGIC; + dump->start_code = 0; + dump->start_stack = regs->esp & ~(PAGE_SIZE - 1); + dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT; + dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT; + dump->u_dsize -= dump->u_tsize; + dump->u_ssize = 0; + for (i = 0; i < 8; i++) + dump->u_debugreg[i] = current->debugreg[i]; + + if (dump->start_stack < TASK_SIZE) + dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT; + + dump->regs = *regs; + + dump->u_fpvalid = dump_fpu (regs, &dump->i387); +#endif +} + +/* Fill in the fpu structure for a core dump. */ +int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) +{ + return 0; +} |