2 files changed, 73 insertions, 42 deletions

diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index 2d4dd23168dd..828ba4f107d9 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -55,6 +55,15 @@ extern void machine_shutdown(void);
 struct pt_regs;
 extern void machine_crash_shutdown(struct pt_regs *);
 
+/* 
+ * Architecture independent implemenations of sys_reboot commands.
+ */
+
+extern void kernel_restart(char *cmd);
+extern void kernel_halt(void);
+extern void kernel_power_off(void);
+extern void kernel_kexec(void);
+
 #endif
 
 #endif /* _LINUX_REBOOT_H */
diff --git a/kernel/sys.c b/kernel/sys.c
index 5fc10d3e3891..7e033809ef5f 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -361,6 +361,62 @@ out_unlock:
         return retval;
 }
 
+void kernel_restart(char *cmd)
+{
+        notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
+        system_state = SYSTEM_RESTART;
+        device_suspend(PMSG_FREEZE);
+        device_shutdown();
+        if (!cmd) {
+                printk(KERN_EMERG "Restarting system.\n");
+        } else {
+                printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
+        }
+        printk(".\n");
+        machine_restart(cmd);
+}
+EXPORT_SYMBOL_GPL(kernel_restart);
+
+void kernel_kexec(void)
+{
+#ifdef CONFIG_KEXEC
+        struct kimage *image;
+        image = xchg(&kexec_image, 0);
+        if (!image) {
+                return;
+        }
+        notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
+        system_state = SYSTEM_RESTART;
+        device_suspend(PMSG_FREEZE);
+        device_shutdown();
+        printk(KERN_EMERG "Starting new kernel\n");
+        machine_shutdown();
+        machine_kexec(image);
+#endif
+}
+EXPORT_SYMBOL_GPL(kernel_kexec);
+
+void kernel_halt(void)
+{
+        notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
+        system_state = SYSTEM_HALT;
+        device_suspend(PMSG_SUSPEND);
+        device_shutdown();
+        printk(KERN_EMERG "System halted.\n");
+        machine_halt();
+}
+EXPORT_SYMBOL_GPL(kernel_halt);
+
+void kernel_power_off(void)
+{
+        notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
+        system_state = SYSTEM_POWER_OFF;
+        device_suspend(PMSG_SUSPEND);
+        device_shutdown();
+        printk(KERN_EMERG "Power down.\n");
+        machine_power_off();
+}
+EXPORT_SYMBOL_GPL(kernel_power_off);
 
 /*
  * Reboot system call: for obvious reasons only root may call it,
@@ -389,12 +445,7 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user
         lock_kernel();
         switch (cmd) {
         case LINUX_REBOOT_CMD_RESTART:
-                notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
-                system_state = SYSTEM_RESTART;
-                device_suspend(PMSG_FREEZE);
-                device_shutdown();
-                printk(KERN_EMERG "Restarting system.\n");
-                machine_restart(NULL);
+                kernel_restart(NULL);
                 break;
 
         case LINUX_REBOOT_CMD_CAD_ON:
@@ -406,23 +457,13 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user
                 break;
 
         case LINUX_REBOOT_CMD_HALT:
-                notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
-                system_state = SYSTEM_HALT;
-                device_suspend(PMSG_SUSPEND);
-                device_shutdown();
-                printk(KERN_EMERG "System halted.\n");
-                machine_halt();
+                kernel_halt();
                 unlock_kernel();
                 do_exit(0);
                 break;
 
         case LINUX_REBOOT_CMD_POWER_OFF:
-                notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
-                system_state = SYSTEM_POWER_OFF;
-                device_suspend(PMSG_SUSPEND);
-                device_shutdown();
-                printk(KERN_EMERG "Power down.\n");
-                machine_power_off();
+                kernel_power_off();
                 unlock_kernel();
                 do_exit(0);
                 break;
@@ -434,33 +475,14 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user
                 }
                 buffer[sizeof(buffer) - 1] = '\0';
 
-                notifier_call_chain(&reboot_notifier_list, SYS_RESTART, buffer);
-                system_state = SYSTEM_RESTART;
-                device_suspend(PMSG_FREEZE);
-                device_shutdown();
-                printk(KERN_EMERG "Restarting system with command '%s'.\n", buffer);
-                machine_restart(buffer);
+                kernel_restart(buffer);
                 break;
 
-#ifdef CONFIG_KEXEC
         case LINUX_REBOOT_CMD_KEXEC:
-        {
-                struct kimage *image;
-                image = xchg(&kexec_image, 0);
-                if (!image) {
-                        unlock_kernel();
-                        return -EINVAL;
-                }
-                notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
-                system_state = SYSTEM_RESTART;
-                device_suspend(PMSG_FREEZE);
-                device_shutdown();
-                printk(KERN_EMERG "Starting new kernel\n");
-                machine_shutdown();
-                machine_kexec(image);
-                break;
-        }
-#endif
+                kernel_kexec();
+                unlock_kernel();
+                return -EINVAL;
+
 #ifdef CONFIG_SOFTWARE_SUSPEND
         case LINUX_REBOOT_CMD_SW_SUSPEND:
                 {