mirror of https://gitee.com/openkylin/linux.git
78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/*
|
|
* OpenRISC idle.c
|
|
*
|
|
* Linux architectural port borrowing liberally from similar works of
|
|
* others. All original copyrights apply as per the original source
|
|
* declaration.
|
|
*
|
|
* Modifications for the OpenRISC architecture:
|
|
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
|
|
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* Idle daemon for or32. Idle daemon will handle any action
|
|
* that needs to be taken when the system becomes idle.
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/tick.h>
|
|
|
|
#include <asm/pgtable.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/system.h>
|
|
#include <asm/io.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/pgalloc.h>
|
|
|
|
void (*powersave) (void) = NULL;
|
|
|
|
static inline void pm_idle(void)
|
|
{
|
|
barrier();
|
|
}
|
|
|
|
void cpu_idle(void)
|
|
{
|
|
set_thread_flag(TIF_POLLING_NRFLAG);
|
|
|
|
/* endless idle loop with no priority at all */
|
|
while (1) {
|
|
tick_nohz_stop_sched_tick(1);
|
|
|
|
while (!need_resched()) {
|
|
check_pgt_cache();
|
|
rmb();
|
|
|
|
clear_thread_flag(TIF_POLLING_NRFLAG);
|
|
|
|
local_irq_disable();
|
|
/* Don't trace irqs off for idle */
|
|
stop_critical_timings();
|
|
if (!need_resched() && powersave != NULL)
|
|
powersave();
|
|
start_critical_timings();
|
|
local_irq_enable();
|
|
set_thread_flag(TIF_POLLING_NRFLAG);
|
|
}
|
|
|
|
tick_nohz_restart_sched_tick();
|
|
preempt_enable_no_resched();
|
|
schedule();
|
|
preempt_disable();
|
|
}
|
|
}
|