X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fx86_64%2Fkernel%2Freboot.c;h=57117b8beb2bfd14e7fc51a618f56fff36176826;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=be4b36f762cf42adb461ec5ea51ea75da45e0e02;hpb=cee37fe97739d85991964371c1f3a745c00dd236;p=linux-2.6.git

diff --git a/arch/x86_64/kernel/reboot.c b/arch/x86_64/kernel/reboot.c
index be4b36f76..57117b8be 100644
--- a/arch/x86_64/kernel/reboot.c
+++ b/arch/x86_64/kernel/reboot.c
@@ -6,6 +6,7 @@
 #include <linux/kernel.h>
 #include <linux/ctype.h>
 #include <linux/string.h>
+#include <linux/pm.h>
 #include <asm/io.h>
 #include <asm/kdebug.h>
 #include <asm/delay.h>
@@ -66,34 +67,6 @@ static int __init reboot_setup(char *str)
 
 __setup("reboot=", reboot_setup);
 
-#ifdef CONFIG_SMP
-static void smp_halt(void)
-{
-	int cpuid = safe_smp_processor_id(); 
-	static int first_entry = 1;
-
-	if (reboot_force)
-		return;
-
-	if (first_entry) {
-		first_entry = 0;
-		smp_call_function((void *)machine_restart, NULL, 1, 0);
-	}
-			
-	smp_stop_cpu(); 
-
-	/* AP calling this. Just halt */
-	if (cpuid != boot_cpu_id) { 
-		for (;;) 
-			asm("hlt");
-	}
-
-	/* Wait for all other CPUs to have run smp_stop_cpu */
-	while (!cpus_empty(cpu_online_map))
-		rep_nop(); 
-}
-#endif
-
 static inline void kb_wait(void)
 {
 	int i;
@@ -103,25 +76,45 @@ static inline void kb_wait(void)
 			break;
 }
 
-void machine_restart(char * __unused)
+void machine_shutdown(void)
 {
-	int i;
+	unsigned long flags;
+	/* Stop the cpus and apics */
+#ifdef CONFIG_SMP
+	int reboot_cpu_id;
 
-	printk("machine restart\n");
+	/* The boot cpu is always logical cpu 0 */
+	reboot_cpu_id = 0;
 
-#ifdef CONFIG_SMP
-	smp_halt(); 
+	/* Make certain the cpu I'm about to reboot on is online */
+	if (!cpu_isset(reboot_cpu_id, cpu_online_map)) {
+		reboot_cpu_id = smp_processor_id();
+	}
+
+	/* Make certain I only run on the appropriate processor */
+	set_cpus_allowed(current, cpumask_of_cpu(reboot_cpu_id));
+
+	/* O.K Now that I'm on the appropriate processor,
+	 * stop all of the others.
+	 */
+	smp_send_stop();
 #endif
 
-	if (!reboot_force) {
-		local_irq_disable();
+	local_irq_save(flags);
+
 #ifndef CONFIG_SMP
-		disable_local_APIC();
+	disable_local_APIC();
 #endif
-		disable_IO_APIC();
-		local_irq_enable();
-	}
-	
+
+	disable_IO_APIC();
+
+	local_irq_restore(flags);
+}
+
+void machine_emergency_restart(void)
+{
+	int i;
+
 	/* Tell the BIOS if we want cold or warm reboot */
 	*((unsigned short *)__va(0x472)) = reboot_mode;
        
@@ -129,7 +122,7 @@ void machine_restart(char * __unused)
 		/* Could also try the reset bit in the Hammer NB */
 		switch (reboot_type) { 
 		case BOOT_KBD:
-		for (i=0; i<100; i++) {
+		for (i=0; i<10; i++) {
 			kb_wait();
 			udelay(50);
 			outb(0xfe,0x64);         /* pulse reset low */
@@ -146,18 +139,27 @@ void machine_restart(char * __unused)
 	}      
 }
 
-EXPORT_SYMBOL(machine_restart);
+void machine_restart(char * __unused)
+{
+	printk("machine restart\n");
+
+	if (!reboot_force) {
+		machine_shutdown();
+	}
+	machine_emergency_restart();
+}
 
 void machine_halt(void)
 {
 }
 
-EXPORT_SYMBOL(machine_halt);
-
 void machine_power_off(void)
 {
-	if (pm_power_off)
+	if (pm_power_off) {
+		if (!reboot_force) {
+			machine_shutdown();
+		}
 		pm_power_off();
+	}
 }
 
-EXPORT_SYMBOL(machine_power_off);