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x86: add ACPI reboot option

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Add the ability to reboot an x86_64 based machine using the RESET_REG in the
FADT ACPI table.

Signed-off-by: Aaron Durbin <adurbin@google.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Aaron Durbin 2008-01-30 13:31:17 +01:00 committed by Ingo Molnar
parent 5f561d3be8
commit fa20efd2fc
2 changed files with 14 additions and 2 deletions
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5
Documentation/x86_64/boot-options.txt
View file

@ -110,12 +110,15 @@ Idle loop
Rebooting
reboot=b[ios] | t[riple] | k[bd] [, [w]arm | [c]old]
reboot=b[ios] | t[riple] | k[bd] | a[cpi] [, [w]arm | [c]old]
bios Use the CPU reboot vector for warm reset
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)
acpi Use the ACPI RESET_REG in the FADT. If ACPI is not configured or the
ACPI reset does not work, the reboot path attempts the reset using
the keyboard controller.
Using warm reset will be much faster especially on big memory
systems because the BIOS will not go through the memory check.

11
arch/x86/kernel/reboot_64.c
View file

@ -9,6 +9,7 @@
#include <linux/pm.h>
#include <linux/kdebug.h>
#include <linux/sched.h>
#include <acpi/reboot.h>
#include <asm/io.h>
#include <asm/delay.h>
#include <asm/desc.h>
@ -29,7 +30,8 @@ EXPORT_SYMBOL(pm_power_off);
static long no_idt[3];
static enum {
BOOT_TRIPLE = 't',
BOOT_KBD = 'k'
BOOT_KBD = 'k',
BOOT_ACPI = 'a'
} reboot_type = BOOT_KBD;
static int reboot_mode = 0;
int reboot_force;
@ -39,6 +41,7 @@ int reboot_force;
cold Set the cold reboot flag
triple Force a triple fault (init)
kbd Use the keyboard controller. cold reset (default)
acpi Use the RESET_REG in the FADT
force Avoid anything that could hang.
*/
static int __init reboot_setup(char *str)
@ -54,6 +57,7 @@ static int __init reboot_setup(char *str)
break;
case 't':
case 'a':
case 'b':
case 'k':
reboot_type = *str;
@ -146,6 +150,11 @@ void machine_emergency_restart(void)
reboot_type = BOOT_KBD;
break;
case BOOT_ACPI:
acpi_reboot();
reboot_type = BOOT_KBD;
break;
}
}
}