mirror of https://gitee.com/openkylin/linux.git
82 lines
1.6 KiB
C
82 lines
1.6 KiB
C
|
/*
|
||
|
|
* 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();
|
||
|
|
}
|
||
|
|
}
|