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1da1180c PM |
1 | /* |
2 | * The idle loop for all SuperH platforms. | |
3 | * | |
4 | * Copyright (C) 2002 - 2008 Paul Mundt | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/pm.h> | |
14 | #include <linux/tick.h> | |
15 | #include <linux/preempt.h> | |
16 | #include <linux/thread_info.h> | |
17 | #include <linux/irqflags.h> | |
18 | #include <asm/pgalloc.h> | |
19 | #include <asm/system.h> | |
20 | #include <asm/atomic.h> | |
21 | ||
22 | static int hlt_counter; | |
23 | void (*pm_idle)(void); | |
24 | void (*pm_power_off)(void); | |
25 | EXPORT_SYMBOL(pm_power_off); | |
26 | ||
27 | static int __init nohlt_setup(char *__unused) | |
28 | { | |
29 | hlt_counter = 1; | |
30 | return 1; | |
31 | } | |
32 | __setup("nohlt", nohlt_setup); | |
33 | ||
34 | static int __init hlt_setup(char *__unused) | |
35 | { | |
36 | hlt_counter = 0; | |
37 | return 1; | |
38 | } | |
39 | __setup("hlt", hlt_setup); | |
40 | ||
41 | static void default_idle(void) | |
42 | { | |
43 | if (!hlt_counter) { | |
44 | clear_thread_flag(TIF_POLLING_NRFLAG); | |
45 | smp_mb__after_clear_bit(); | |
46 | set_bl_bit(); | |
47 | stop_critical_timings(); | |
48 | ||
49 | while (!need_resched()) | |
50 | cpu_sleep(); | |
51 | ||
52 | start_critical_timings(); | |
53 | clear_bl_bit(); | |
54 | set_thread_flag(TIF_POLLING_NRFLAG); | |
55 | } else | |
56 | while (!need_resched()) | |
57 | cpu_relax(); | |
58 | } | |
59 | ||
60 | void cpu_idle(void) | |
61 | { | |
62 | set_thread_flag(TIF_POLLING_NRFLAG); | |
63 | ||
64 | /* endless idle loop with no priority at all */ | |
65 | while (1) { | |
66 | void (*idle)(void) = pm_idle; | |
67 | ||
68 | if (!idle) | |
69 | idle = default_idle; | |
70 | ||
71 | tick_nohz_stop_sched_tick(1); | |
72 | while (!need_resched()) | |
73 | idle(); | |
74 | tick_nohz_restart_sched_tick(); | |
75 | ||
76 | preempt_enable_no_resched(); | |
77 | schedule(); | |
78 | preempt_disable(); | |
79 | check_pgt_cache(); | |
80 | } | |
81 | } |