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2a7be116 JB |
1 | /* |
2 | * OpenRISC idle.c | |
3 | * | |
4 | * Linux architectural port borrowing liberally from similar works of | |
5 | * others. All original copyrights apply as per the original source | |
6 | * declaration. | |
7 | * | |
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> | |
11 | * | |
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. | |
16 | * | |
17 | * Idle daemon for or32. Idle daemon will handle any action | |
18 | * that needs to be taken when the system becomes idle. | |
19 | */ | |
20 | ||
21 | #include <linux/errno.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/mm.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> | |
31 | ||
32 | #include <asm/pgtable.h> | |
33 | #include <asm/uaccess.h> | |
34 | #include <asm/system.h> | |
35 | #include <asm/io.h> | |
36 | #include <asm/processor.h> | |
37 | #include <asm/mmu.h> | |
38 | #include <asm/cache.h> | |
39 | #include <asm/pgalloc.h> | |
40 | ||
41 | void (*powersave) (void) = NULL; | |
42 | ||
43 | static inline void pm_idle(void) | |
44 | { | |
45 | barrier(); | |
46 | } | |
47 | ||
48 | void cpu_idle(void) | |
49 | { | |
50 | set_thread_flag(TIF_POLLING_NRFLAG); | |
51 | ||
52 | /* endless idle loop with no priority at all */ | |
53 | while (1) { | |
54 | tick_nohz_stop_sched_tick(1); | |
55 | ||
56 | while (!need_resched()) { | |
57 | check_pgt_cache(); | |
58 | rmb(); | |
59 | ||
60 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
61 | ||
62 | local_irq_disable(); | |
63 | /* Don't trace irqs off for idle */ | |
64 | stop_critical_timings(); | |
65 | if (!need_resched() && powersave != NULL) | |
66 | powersave(); | |
67 | start_critical_timings(); | |
68 | local_irq_enable(); | |
69 | set_thread_flag(TIF_POLLING_NRFLAG); | |
70 | } | |
71 | ||
72 | tick_nohz_restart_sched_tick(); | |
73 | preempt_enable_no_resched(); | |
74 | schedule(); | |
75 | preempt_disable(); | |
76 | } | |
77 | } |