LXR linux/arch/sh/kernel/idle.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * The idle loop for all SuperH platforms.
   4 *
   5 *  Copyright (C) 2002 - 2009  Paul Mundt
   6 */
   7#include <linux/module.h>
   8#include <linux/init.h>
   9#include <linux/mm.h>
  10#include <linux/pm.h>
  11#include <linux/tick.h>
  12#include <linux/preempt.h>
  13#include <linux/thread_info.h>
  14#include <linux/irqflags.h>
  15#include <linux/smp.h>
  16#include <linux/atomic.h>
  17#include <asm/smp.h>
  18#include <asm/bl_bit.h>
  19
  20static void (*sh_idle)(void);
  21
  22void default_idle(void)
  23{
  24        set_bl_bit();
  25        raw_local_irq_enable();
  26        /* Isn't this racy ? */
  27        cpu_sleep();
  28        clear_bl_bit();
  29}
  30
  31void arch_cpu_idle_dead(void)
  32{
  33        play_dead();
  34}
  35
  36void arch_cpu_idle(void)
  37{
  38        sh_idle();
  39}
  40
  41void __init select_idle_routine(void)
  42{
  43        /*
  44         * If a platform has set its own idle routine, leave it alone.
  45         */
  46        if (!sh_idle)
  47                sh_idle = default_idle;
  48}
  49
  50void stop_this_cpu(void *unused)
  51{
  52        local_irq_disable();
  53        set_cpu_online(smp_processor_id(), false);
  54
  55        for (;;)
  56                cpu_sleep();
  57}
  58