Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fa20efd2fcd9349770113c6f72fc76ce437b62f5
Commit:     fa20efd2fcd9349770113c6f72fc76ce437b62f5
Parent:     5f561d3be8f0db54f9b4fc5cb5db05343f372431
Author:     Aaron Durbin <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:31:17 2008 +0100
Committer:  Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:31:17 2008 +0100

    x86: add ACPI reboot option
    
    Add the ability to reboot an x86_64 based machine using the RESET_REG in the
    FADT ACPI table.
    
    Signed-off-by: Aaron Durbin <[EMAIL PROTECTED]>
    Cc: Len Brown <[EMAIL PROTECTED]>
    Cc: Andi Kleen <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
 Documentation/x86_64/boot-options.txt |    5 ++++-
 arch/x86/kernel/reboot_64.c           |   11 ++++++++++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/Documentation/x86_64/boot-options.txt 
b/Documentation/x86_64/boot-options.txt
index 9453118..d7a3332 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -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.
diff --git a/arch/x86/kernel/reboot_64.c b/arch/x86/kernel/reboot_64.c
index 53620a9..307f996 100644
--- a/arch/x86/kernel/reboot_64.c
+++ b/arch/x86/kernel/reboot_64.c
@@ -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;
                }      
        }      
 }
-
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