[PATCH -v7 06/11] x86, prepare reboot_mode for moving to generic kernel code.

Robin Holt
2013-05-01T17:07:52Z

This patch prepares for the moving the parsing of reboot= to the generic
kernel code by making reboot_mode into a more generic form.

Signed-off-by: Robin Holt <holt@sgi.com>
To: Miguel Boton <mboton.lkml@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
To: H. Peter Anvin <hpa@zytor.com>
Cc: Russ Anderson <rja@sgi.com>
Cc: Robin Holt <holt@sgi.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Cc: the arch/x86 maintainers <x86@kernel.org>
Cc: Arm Mailing List <linux-arm-kernel@lists.infradead.org>
---
arch/x86/kernel/reboot.c | 12 +++++++-----
include/linux/reboot.h | 5 +++++
2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 76fa1e9..d42e3b2 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -36,7 +36,7 @@ void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);

static const struct desc_ptr no_idt = {};
-static int reboot_mode;
+static enum reboot_mode reboot_mode = REBOOT_COLD;
enum reboot_type reboot_type = BOOT_ACPI;
int reboot_force;

@@ -88,11 +88,11 @@ static int __init reboot_setup(char *str)

switch (*str) {
case 'w':
- reboot_mode = 0x1234;
+ reboot_mode = REBOOT_WARM;
break;

case 'c':
- reboot_mode = 0;
+ reboot_mode = REBOOT_COLD;
break;

#ifdef CONFIG_SMP
@@ -536,6 +536,7 @@ static void native_machine_emergency_restart(void)
int i;
int attempt = 0;
int orig_reboot_type = reboot_type;
+ unsigned short mode;

if (reboot_emergency)
emergency_vmx_disable_all();
@@ -543,7 +544,8 @@ static void native_machine_emergency_restart(void)
tboot_shutdown(TB_SHUTDOWN_REBOOT);

/* Tell the BIOS if we want cold or warm reboot */
- *((unsigned short *)__va(0x472)) = reboot_mode;
+ mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
+ *((unsigned short *)__va(0x472)) = mode;

for (;;) {
/* Could also try the reset bit in the Hammer NB */
@@ -585,7 +587,7 @@ static void native_machine_emergency_restart(void)

case BOOT_EFI:
if (efi_enabled(EFI_RUNTIME_SERVICES))
- efi.reset_system(reboot_mode ?
+ efi.reset_system(reboot_mode == REBOOT_WARM ?
EFI_RESET_WARM :
EFI_RESET_COLD,
EFI_SUCCESS, 0, NULL);
diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index 23b3630..2ca9ed7 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -10,6 +10,11 @@
#define SYS_HALT 0x0002 /* Notify of system halt */
#define SYS_POWER_OFF 0x0003 /* Notify of system power off */

+enum reboot_mode {
+ REBOOT_COLD = 0,
+ REBOOT_WARM,
+};
+
extern int register_reboot_notifier(struct notifier_block *);
extern int unregister_reboot_notifier(struct notifier_block *);

--
1.8.2.1