2 * linux/arch/cris/kernel/process.c
4 * Copyright (C) 1995 Linus Torvalds
5 * Copyright (C) 2000-2002 Axis Communications AB
7 * Authors: Bjorn Wesen (bjornw@axis.com)
12 * This file handles the architecture-dependent parts of process handling..
15 #include <linux/atomic.h>
16 #include <asm/pgtable.h>
17 #include <asm/uaccess.h>
19 #include <linux/module.h>
20 #include <linux/spinlock.h>
21 #include <linux/init_task.h>
22 #include <linux/sched.h>
24 #include <linux/user.h>
25 #include <linux/elfcore.h>
26 #include <linux/mqueue.h>
27 #include <linux/reboot.h>
32 * The hlt_counter, disable_hlt and enable_hlt is just here as a hook if
33 * there would ever be a halt sequence (for power save when idle) with
34 * some largish delay when halting or resuming *and* a driver that can't
35 * afford that delay. The hlt_counter would then be checked before
36 * executing the halt sequence, and the driver marks the unhaltable
37 * region by enable_hlt/disable_hlt.
40 int cris_hlt_counter=0;
42 void disable_hlt(void)
47 EXPORT_SYMBOL(disable_hlt);
54 EXPORT_SYMBOL(enable_hlt);
57 * The following aren't currently used.
59 void (*pm_idle)(void);
61 extern void default_idle(void);
63 void (*pm_power_off)(void);
64 EXPORT_SYMBOL(pm_power_off);
67 * The idle thread. There's no useful work to be
68 * done, so just try to conserve power and have a
69 * low exit latency (ie sit in a loop waiting for
70 * somebody to say that they'd like to reschedule)
75 /* endless idle loop with no priority at all */
77 while (!need_resched()) {
80 * Mark this as an RCU critical section so that
81 * synchronize_kernel() in the unload path waits
89 schedule_preempt_disabled();
93 void hard_reset_now (void);
95 void machine_restart(char *cmd)
101 * Similar to machine_power_off, but don't shut off power. Add code
102 * here to freeze the system for e.g. post-mortem debug purpose when
103 * possible. This halt has nothing to do with the idle halt.
106 void machine_halt(void)
110 /* If or when software power-off is implemented, add code here. */
112 void machine_power_off(void)
117 * When a process does an "exec", machine state like FPU and debug
118 * registers need to be reset. This is a hook function for that.
119 * Currently we don't have any such state to reset, so this is empty.
122 void flush_thread(void)
126 /* Fill in the fpu structure for a core dump. */
127 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)