mirror of
https://github.com/torvalds/linux
synced 2024-09-28 07:20:56 +00:00
0963aba54a
i386 machine_power_off was disabling the local apic and all of it's users wanted to be on the boot cpu. So call machine_shutdown which places us on the boot cpu and disables the apics. This keeps us in sync and reduces the number of cases we need to worry about in the power management code. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
163 lines
2.9 KiB
C
163 lines
2.9 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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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_shutdown(void)
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{
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/* Stop the cpus and apics */
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#ifdef CONFIG_SMP
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int reboot_cpu_id;
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/* The boot cpu is always logical cpu 0 */
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reboot_cpu_id = 0;
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/* Make certain the cpu I'm about to reboot on is online */
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if (!cpu_isset(reboot_cpu_id, cpu_online_map)) {
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reboot_cpu_id = smp_processor_id();
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}
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/* Make certain I only run on the appropriate processor */
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set_cpus_allowed(current, cpumask_of_cpu(reboot_cpu_id));
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/* O.K Now that I'm on the appropriate processor,
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* stop all of the others.
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*/
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smp_send_stop();
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#endif
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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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void machine_emergency_restart(void)
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{
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int i;
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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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void machine_restart(char * __unused)
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{
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printk("machine restart\n");
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if (!reboot_force) {
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machine_shutdown();
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}
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machine_emergency_restart();
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}
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void machine_halt(void)
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{
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}
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void machine_power_off(void)
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{
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if (!reboot_force) {
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machine_shutdown();
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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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