mirror of https://gitee.com/openkylin/linux.git
164 lines
2.8 KiB
C
164 lines
2.8 KiB
C
/* Various gunk just to reboot the machine. */
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#include <linux/module.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/kernel.h>
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#include <linux/ctype.h>
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#include <linux/string.h>
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#include <asm/io.h>
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#include <asm/kdebug.h>
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#include <asm/delay.h>
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#include <asm/hw_irq.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/apic.h>
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/*
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* Power off function, if any
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*/
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void (*pm_power_off)(void);
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static long no_idt[3];
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static enum {
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BOOT_TRIPLE = 't',
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BOOT_KBD = 'k'
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} reboot_type = BOOT_KBD;
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static int reboot_mode = 0;
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int reboot_force;
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/* reboot=t[riple] | k[bd] [, [w]arm | [c]old]
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warm Don't set the cold reboot flag
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cold Set the cold reboot flag
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triple Force a triple fault (init)
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kbd Use the keyboard controller. cold reset (default)
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force Avoid anything that could hang.
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*/
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static int __init reboot_setup(char *str)
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{
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for (;;) {
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switch (*str) {
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case 'w':
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reboot_mode = 0x1234;
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break;
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case 'c':
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reboot_mode = 0;
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break;
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case 't':
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case 'b':
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case 'k':
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reboot_type = *str;
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break;
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case 'f':
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reboot_force = 1;
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break;
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}
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if((str = strchr(str,',')) != NULL)
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str++;
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else
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break;
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}
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return 1;
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}
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__setup("reboot=", reboot_setup);
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#ifdef CONFIG_SMP
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static void smp_halt(void)
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{
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int cpuid = safe_smp_processor_id();
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static int first_entry = 1;
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if (reboot_force)
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return;
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if (first_entry) {
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first_entry = 0;
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smp_call_function((void *)machine_restart, NULL, 1, 0);
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}
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smp_stop_cpu();
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/* AP calling this. Just halt */
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if (cpuid != boot_cpu_id) {
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for (;;)
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asm("hlt");
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}
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/* Wait for all other CPUs to have run smp_stop_cpu */
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while (!cpus_empty(cpu_online_map))
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rep_nop();
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}
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#endif
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static inline void kb_wait(void)
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{
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int i;
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for (i=0; i<0x10000; i++)
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if ((inb_p(0x64) & 0x02) == 0)
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break;
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}
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void machine_restart(char * __unused)
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{
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int i;
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printk("machine restart\n");
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#ifdef CONFIG_SMP
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smp_halt();
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#endif
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if (!reboot_force) {
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local_irq_disable();
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#ifndef CONFIG_SMP
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disable_local_APIC();
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#endif
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disable_IO_APIC();
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local_irq_enable();
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}
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/* Tell the BIOS if we want cold or warm reboot */
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*((unsigned short *)__va(0x472)) = reboot_mode;
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for (;;) {
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/* Could also try the reset bit in the Hammer NB */
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switch (reboot_type) {
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case BOOT_KBD:
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for (i=0; i<100; i++) {
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kb_wait();
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udelay(50);
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outb(0xfe,0x64); /* pulse reset low */
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udelay(50);
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}
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case BOOT_TRIPLE:
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__asm__ __volatile__("lidt (%0)": :"r" (&no_idt));
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__asm__ __volatile__("int3");
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reboot_type = BOOT_KBD;
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break;
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}
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}
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}
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EXPORT_SYMBOL(machine_restart);
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void machine_halt(void)
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{
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}
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EXPORT_SYMBOL(machine_halt);
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void machine_power_off(void)
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{
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if (pm_power_off)
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pm_power_off();
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}
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EXPORT_SYMBOL(machine_power_off);
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