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/pgalloc.h>
  18#include <asm/smp.h>
  19#include <asm/bl_bit.h>
  20
  21static void (*sh_idle)(void);
  22
  23void default_idle(void)
  24{
  25        set_bl_bit();
  26        local_irq_enable();
  27        /* Isn't this racy ? */
  28        cpu_sleep();
  29        clear_bl_bit();
  30}
  31
  32void arch_cpu_idle_dead(void)
  33{
  34        play_dead();
  35}
  36
  37void arch_cpu_idle(void)
  38{
  39        sh_idle();
  40}
  41
  42void __init select_idle_routine(void)
  43{
  44        /*
  45         * If a platform has set its own idle routine, leave it alone.
  46         */
  47        if (!sh_idle)
  48                sh_idle = default_idle;
  49}
  50
  51void stop_this_cpu(void *unused)
  52{
  53        local_irq_disable();
  54        set_cpu_online(smp_processor_id(), false);
  55
  56        for (;;)
  57                cpu_sleep();
  58}
  59