diff options
Diffstat (limited to 'arch/sh/kernel/idle.c')
-rw-r--r-- | arch/sh/kernel/idle.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/arch/sh/kernel/idle.c b/arch/sh/kernel/idle.c new file mode 100644 index 000000000000..fe59ccfc1152 --- /dev/null +++ b/arch/sh/kernel/idle.c @@ -0,0 +1,81 @@ +/* + * The idle loop for all SuperH platforms. + * + * Copyright (C) 2002 - 2008 Paul Mundt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/pm.h> +#include <linux/tick.h> +#include <linux/preempt.h> +#include <linux/thread_info.h> +#include <linux/irqflags.h> +#include <asm/pgalloc.h> +#include <asm/system.h> +#include <asm/atomic.h> + +static int hlt_counter; +void (*pm_idle)(void); +void (*pm_power_off)(void); +EXPORT_SYMBOL(pm_power_off); + +static int __init nohlt_setup(char *__unused) +{ + hlt_counter = 1; + return 1; +} +__setup("nohlt", nohlt_setup); + +static int __init hlt_setup(char *__unused) +{ + hlt_counter = 0; + return 1; +} +__setup("hlt", hlt_setup); + +static void default_idle(void) +{ + if (!hlt_counter) { + clear_thread_flag(TIF_POLLING_NRFLAG); + smp_mb__after_clear_bit(); + set_bl_bit(); + stop_critical_timings(); + + while (!need_resched()) + cpu_sleep(); + + start_critical_timings(); + clear_bl_bit(); + set_thread_flag(TIF_POLLING_NRFLAG); + } else + while (!need_resched()) + cpu_relax(); +} + +void cpu_idle(void) +{ + set_thread_flag(TIF_POLLING_NRFLAG); + + /* endless idle loop with no priority at all */ + while (1) { + void (*idle)(void) = pm_idle; + + if (!idle) + idle = default_idle; + + tick_nohz_stop_sched_tick(1); + while (!need_resched()) + idle(); + tick_nohz_restart_sched_tick(); + + preempt_enable_no_resched(); + schedule(); + preempt_disable(); + check_pgt_cache(); + } +} |