reboot.c

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#include <linux/pm.h>
#include <linux/kexec.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/module.h>
#ifdef CONFIG_SUPERH32
#include <asm/watchdog.h>
#endif
#include <asm/addrspace.h>
#include <asm/reboot.h>
#include <asm/tlbflush.h>
#include <asm/traps.h>

void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);

#ifdef CONFIG_SUPERH32
static void watchdog_trigger_immediate(void)
{
    sh_wdt_write_cnt(0xFF);
    sh_wdt_write_csr(0xC2);
}
#endif

static void native_machine_restart(char * __unused)
{
    local_irq_disable();

    /* Destroy all of the TLBs in preparation for reset by MMU */
    __flush_tlb_global();

    /* Address error with SR.BL=1 first. */
    trigger_address_error();

#ifdef CONFIG_SUPERH32
    /* If that fails or is unsupported, go for the watchdog next. */
    watchdog_trigger_immediate();
#endif

    /*
     * Give up and sleep.
     */
    while (1)
        cpu_sleep();
}

static void native_machine_shutdown(void)
{
    smp_send_stop();
}

static void native_machine_power_off(void)
{
    if (pm_power_off)
        pm_power_off();
}

static void native_machine_halt(void)
{
    /* stop other cpus */
    machine_shutdown();

    /* stop this cpu */
    stop_this_cpu(NULL);
}

struct machine_ops machine_ops = {
    .power_off  = native_machine_power_off,
    .shutdown   = native_machine_shutdown,
    .restart    = native_machine_restart,
    .halt       = native_machine_halt,
#ifdef CONFIG_KEXEC
    .crash_shutdown = native_machine_crash_shutdown,
#endif
};

void machine_power_off(void)
{
    machine_ops.power_off();
}

void machine_shutdown(void)
{
    machine_ops.shutdown();
}

void machine_restart(char *cmd)
{
    machine_ops.restart(cmd);
}

void machine_halt(void)
{
    machine_ops.halt();
}

#ifdef CONFIG_KEXEC
void machine_crash_shutdown(struct pt_regs *regs)
{
    machine_ops.crash_shutdown(regs);
}
#endif