4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
8 * Modifications for the OpenRISC architecture:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
17 * Idle daemon for or32. Idle daemon will handle any action
18 * that needs to be taken when the system becomes idle.
21 #include <linux/errno.h>
22 #include <linux/sched.h>
23 #include <linux/kernel.h>
25 #include <linux/smp.h>
26 #include <linux/stddef.h>
27 #include <linux/unistd.h>
28 #include <linux/ptrace.h>
29 #include <linux/slab.h>
30 #include <linux/tick.h>
32 #include <asm/pgtable.h>
33 #include <asm/uaccess.h>
34 #include <asm/system.h>
36 #include <asm/processor.h>
38 #include <asm/cache.h>
39 #include <asm/pgalloc.h>
41 void (*powersave) (void) = NULL;
43 static inline void pm_idle(void)
50 set_thread_flag(TIF_POLLING_NRFLAG);
52 /* endless idle loop with no priority at all */
54 tick_nohz_idle_enter_norcu();
56 while (!need_resched()) {
60 clear_thread_flag(TIF_POLLING_NRFLAG);
63 /* Don't trace irqs off for idle */
64 stop_critical_timings();
65 if (!need_resched() && powersave != NULL)
67 start_critical_timings();
69 set_thread_flag(TIF_POLLING_NRFLAG);
72 tick_nohz_idle_exit_norcu();
73 preempt_enable_no_resched();