x86: Add cpu_shutdown() support

Doesn't do anything yet.

Losely based on a earlier patch by Eric Biederman

---
 arch/i386/kernel/cpu/common.c  |    4 ++++
 arch/i386/kernel/reboot.c      |    1 +
 arch/i386/kernel/smp.c         |    1 +
 arch/i386/mach-visws/reboot.c  |    1 +
 arch/x86_64/kernel/reboot.c    |    1 +
 arch/x86_64/kernel/setup64.c   |    4 ++++
 include/asm-i386/processor.h   |    1 +
 include/asm-x86_64/processor.h |    1 +
 8 files changed, 14 insertions(+)

Index: linux/arch/i386/kernel/reboot.c
===================================================================
--- linux.orig/arch/i386/kernel/reboot.c
+++ linux/arch/i386/kernel/reboot.c
@@ -313,6 +313,7 @@ void machine_shutdown(void)
 #ifdef CONFIG_X86_IO_APIC
 	disable_IO_APIC();
 #endif
+	cpu_shutdown();
 }
 
 void machine_emergency_restart(void)
Index: linux/arch/i386/kernel/smp.c
===================================================================
--- linux.orig/arch/i386/kernel/smp.c
+++ linux/arch/i386/kernel/smp.c
@@ -582,6 +582,7 @@ static void stop_this_cpu (void * dummy)
 	cpu_clear(smp_processor_id(), cpu_online_map);
 	local_irq_disable();
 	disable_local_APIC();
+	cpu_shutdown();
 	if (cpu_data[smp_processor_id()].hlt_works_ok)
 		for(;;) halt();
 	for (;;);
Index: linux/arch/i386/mach-visws/reboot.c
===================================================================
--- linux.orig/arch/i386/mach-visws/reboot.c
+++ linux/arch/i386/mach-visws/reboot.c
@@ -13,6 +13,7 @@ void machine_shutdown(void)
 #ifdef CONFIG_SMP
 	smp_send_stop();
 #endif
+	cpu_shutdown();
 }
 
 void machine_emergency_restart(void)
Index: linux/arch/x86_64/kernel/reboot.c
===================================================================
--- linux.orig/arch/x86_64/kernel/reboot.c
+++ linux/arch/x86_64/kernel/reboot.c
@@ -108,6 +108,7 @@ void machine_shutdown(void)
 #endif
 
 	disable_IO_APIC();
+	cpu_shutdown();
 
 	local_irq_restore(flags);
 }
Index: linux/include/asm-i386/processor.h
===================================================================
--- linux.orig/include/asm-i386/processor.h
+++ linux/include/asm-i386/processor.h
@@ -112,6 +112,7 @@ extern	int cpu_llc_id[NR_CPUS];
 extern char ignore_fpu_irq;
 
 extern void identify_cpu(struct cpuinfo_x86 *);
+extern void cpu_shutdown(void);
 extern void print_cpu_info(struct cpuinfo_x86 *);
 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
 extern unsigned short num_cache_leaves;
Index: linux/include/asm-x86_64/processor.h
===================================================================
--- linux.orig/include/asm-x86_64/processor.h
+++ linux/include/asm-x86_64/processor.h
@@ -98,6 +98,7 @@ extern struct cpuinfo_x86 cpu_data[];
 extern char ignore_irq13;
 
 extern void identify_cpu(struct cpuinfo_x86 *);
+extern void cpu_shutdown(void);
 extern void print_cpu_info(struct cpuinfo_x86 *);
 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
 extern unsigned short num_cache_leaves;
Index: linux/arch/x86_64/kernel/setup64.c
===================================================================
--- linux.orig/arch/x86_64/kernel/setup64.c
+++ linux/arch/x86_64/kernel/setup64.c
@@ -286,3 +286,7 @@ void __cpuinit cpu_init (void)
 
 	raw_local_save_flags(kernel_eflags);
 }
+
+void cpu_shutdown(void)
+{
+}
Index: linux/arch/i386/kernel/cpu/common.c
===================================================================
--- linux.orig/arch/i386/kernel/cpu/common.c
+++ linux/arch/i386/kernel/cpu/common.c
@@ -701,6 +701,10 @@ old_gdt:
 	mxcsr_feature_mask_init();
 }
 
+void cpu_shutdown(void)
+{
+}
+
 #ifdef CONFIG_HOTPLUG_CPU
 void __cpuinit cpu_uninit(void)
 {