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reboot_64.c

/* Various gunk just to reboot the machine. */ 
#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/pm.h>
#include <linux/kdebug.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <asm/delay.h>
#include <asm/desc.h>
#include <asm/hw_irq.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/apic.h>
#include <asm/hpet.h>
#include <asm/gart.h>

/*
 * Power off function, if any
 */
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);

static long no_idt[3];
static enum { 
      BOOT_TRIPLE = 't',
      BOOT_KBD = 'k'
} reboot_type = BOOT_KBD;
static int reboot_mode = 0;
int reboot_force;

/* reboot=t[riple] | k[bd] [, [w]arm | [c]old]
   warm   Don't set the cold reboot flag
   cold   Set the cold reboot flag
   triple Force a triple fault (init)
   kbd    Use the keyboard controller. cold reset (default)
   force  Avoid anything that could hang.
 */ 
static int __init reboot_setup(char *str)
{
      for (;;) {
            switch (*str) {
            case 'w': 
                  reboot_mode = 0x1234;
                  break;

            case 'c':
                  reboot_mode = 0;
                  break;

            case 't':
            case 'b':
            case 'k':
                  reboot_type = *str;
                  break;
            case 'f':
                  reboot_force = 1;
                  break;
            }
            if((str = strchr(str,',')) != NULL)
                  str++;
            else
                  break;
      }
      return 1;
}

__setup("reboot=", reboot_setup);

static inline void kb_wait(void)
{
      int i;

      for (i=0; i<0x10000; i++)
            if ((inb_p(0x64) & 0x02) == 0)
                  break;
}

void machine_shutdown(void)
{
      unsigned long flags;

      /* Stop the cpus and apics */
#ifdef CONFIG_SMP
      int reboot_cpu_id;

      /* The boot cpu is always logical cpu 0 */
      reboot_cpu_id = 0;

      /* Make certain the cpu I'm about to reboot on is online */
      if (!cpu_isset(reboot_cpu_id, cpu_online_map)) {
            reboot_cpu_id = smp_processor_id();
      }

      /* Make certain I only run on the appropriate processor */
      set_cpus_allowed(current, cpumask_of_cpu(reboot_cpu_id));

      /* O.K Now that I'm on the appropriate processor,
       * stop all of the others.
       */
      smp_send_stop();
#endif

      local_irq_save(flags);

#ifndef CONFIG_SMP
      disable_local_APIC();
#endif

      disable_IO_APIC();

#ifdef CONFIG_HPET_TIMER
      hpet_disable();
#endif
      local_irq_restore(flags);

      pci_iommu_shutdown();
}

void machine_emergency_restart(void)
{
      int i;

      /* Tell the BIOS if we want cold or warm reboot */
      *((unsigned short *)__va(0x472)) = reboot_mode;
       
      for (;;) {
            /* Could also try the reset bit in the Hammer NB */
            switch (reboot_type) { 
            case BOOT_KBD:
            for (i=0; i<10; i++) {
                  kb_wait();
                  udelay(50);
                  outb(0xfe,0x64);         /* pulse reset low */
                  udelay(50);
            }

            case BOOT_TRIPLE: 
                  load_idt((const struct desc_ptr *)&no_idt);
                  __asm__ __volatile__("int3");

                  reboot_type = BOOT_KBD;
                  break;
            }      
      }      
}

void machine_restart(char * __unused)
{
      printk("machine restart\n");

      if (!reboot_force) {
            machine_shutdown();
      }
      machine_emergency_restart();
}

void machine_halt(void)
{
}

void machine_power_off(void)
{
      if (pm_power_off) {
            if (!reboot_force) {
                  machine_shutdown();
            }
            pm_power_off();
      }
}


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