x86: EFI runtime service support: EFI runtime services

This patch adds support for several EFI runtime services for EFI x86_64
system.

The EFI support for emergency_restart is added.

Signed-off-by: Chandramouli Narayanan <mouli@linux.intel.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
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>

diff --git a/arch/x86/kernel/reboot_64.c b/arch/x86/kernel/reboot_64.c
index 307f996a39331ce63bfde75160f429d037e2f92b..d6bdf93ffca996a3e079c958e217d713a38c6e19 100644 (file)
--- 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 <linux/efi.h>
 #include <acpi/reboot.h>
 #include <asm/io.h>
 #include <asm/delay.h>
@@ -28,20 +29,17 @@ void (*pm_power_off)(void);
 EXPORT_SYMBOL(pm_power_off);
 
 static long no_idt[3];
-static enum { 
-       BOOT_TRIPLE = 't',
-       BOOT_KBD = 'k',
-       BOOT_ACPI = 'a'
-} reboot_type = BOOT_KBD;
+enum reboot_type reboot_type = BOOT_KBD;
 static int reboot_mode = 0;
 int reboot_force;
 
-/* reboot=t[riple] | k[bd] [, [w]arm | [c]old]
+/* reboot=t[riple] | k[bd] | e[fi] [, [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)
    acpi   Use the RESET_REG in the FADT
+   efi    Use efi reset_system runtime service
    force  Avoid anything that could hang.
  */ 
 static int __init reboot_setup(char *str)
@@ -60,6 +58,7 @@ static int __init reboot_setup(char *str)
                case 'a':
                case 'b':
                case 'k':
+               case 'e':
                        reboot_type = *str;
                        break;
                case 'f':
@@ -155,7 +154,14 @@ void machine_emergency_restart(void)
                        acpi_reboot();
                        reboot_type = BOOT_KBD;
                        break;
-               }      
+
+               case BOOT_EFI:
+                       if (efi_enabled)
+                               efi.reset_system(reboot_mode ? EFI_RESET_WARM : EFI_RESET_COLD,
+                                                EFI_SUCCESS, 0, NULL);
+                       reboot_type = BOOT_KBD;
+                       break;
+               }
        }      
 }
 

diff --git a/include/asm-x86/emergency-restart.h b/include/asm-x86/emergency-restart.h
index 680c3956334542d75617e6d89b82298f906e250a..54189084462ae52c60e5e09becdd07c2612c3526 100644 (file)
--- a/include/asm-x86/emergency-restart.h
+++ b/include/asm-x86/emergency-restart.h
@@ -1,6 +1,15 @@
 #ifndef _ASM_EMERGENCY_RESTART_H
 #define _ASM_EMERGENCY_RESTART_H
 
+enum reboot_type {
+       BOOT_TRIPLE = 't',
+       BOOT_KBD = 'k',
+       BOOT_ACPI = 'a',
+       BOOT_EFI = 'e'
+};
+
+extern enum reboot_type reboot_type;
+
 extern void machine_emergency_restart(void);
 
 #endif /* _ASM_EMERGENCY_RESTART_H */