x86: reboot_{32|64}.c unification

reboot_{32|64}.c unification patch.

This patch unifies the code from the reboot_32.c and reboot_64.c files.

It has been tested in computers with X86_32 and X86_64 kernels and it
looks like all reboot modes work fine (EFI restart system hasn't been
tested yet).

Probably I made some mistakes (like I usually do) so I hope
we can identify and fix them soon.
Signed-off-by: Miguel Boton <mboton@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/Makefile

@@ -30,8 +30,8 @@ obj-y				+= step.o
 obj-$(CONFIG_STACKTRACE)	+= stacktrace.o
 obj-y				+= cpu/
 obj-y				+= acpi/
-obj-$(CONFIG_X86_BIOS_REBOOT)	+= reboot_32.o
-obj-$(CONFIG_X86_64)            += reboot_64.o
+obj-$(CONFIG_X86_BIOS_REBOOT)	+= reboot.o
+obj-$(CONFIG_X86_64)		+= reboot.o
 obj-$(CONFIG_MCA)		+= mca_32.o
 obj-$(CONFIG_X86_MSR)		+= msr.o
 obj-$(CONFIG_X86_CPUID)		+= cpuid.o

arch/x86/kernel/reboot_64.c

-/* Various gunk just to reboot the machine. */ 
-#include <linux/module.h>
-#include <linux/reboot.h>
-#include <linux/init.h>
-#include <linux/smp.h>
-#include <linux/kernel.h>
-#include <linux/ctype.h>
-#include <linux/string.h>
-#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>
-#include <asm/desc.h>
-#include <asm/hw_irq.h>
-#include <asm/system.h>
-#include <asm/pgtable.h>
-#include <asm/tlbflush.h>
-#include <asm/apic.h>
-#include <asm/hpet.h>
-#include <asm/gart.h>
-
-/*
- * Power off function, if any
- */
-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
-static long no_idt[3];
-enum reboot_type reboot_type = BOOT_KBD;
-static int reboot_mode = 0;
-int reboot_force;
-
-/* 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)
-{
-	for (;;) {
-		switch (*str) {
-		case 'w': 
-			reboot_mode = 0x1234;
-			break;
-
-		case 'c':
-			reboot_mode = 0;
-			break;
-
-		case 't':
-		case 'a':
-		case 'b':
-		case 'k':
-		case 'e':
-			reboot_type = *str;
-			break;
-		case 'f':
-			reboot_force = 1;
-			break;
-		}
-		if((str = strchr(str,',')) != NULL)
-			str++;
-		else
-			break;
-	}
-	return 1;
-}
-
-__setup("reboot=", reboot_setup);
-
-static inline void kb_wait(void)
-{
-	int i;
-
-	for (i=0; i<0x10000; i++)
-		if ((inb_p(0x64) & 0x02) == 0)
-			break;
-}
-
-void machine_shutdown(void)
-{
-	unsigned long flags;
-
-	/* Stop the cpus and apics */
-#ifdef CONFIG_SMP
-	int reboot_cpu_id;
-
-	/* The boot cpu is always logical cpu 0 */
-	reboot_cpu_id = 0;
-
-	/* 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
-
-	local_irq_save(flags);
-
-#ifndef CONFIG_SMP
-	disable_local_APIC();
-#endif
-
-	disable_IO_APIC();
-
-#ifdef CONFIG_HPET_TIMER
-	hpet_disable();
-#endif
-	local_irq_restore(flags);
-
-	pci_iommu_shutdown();
-}
-
-void machine_emergency_restart(void)
-{
-	int i;
-
-	/* Tell the BIOS if we want cold or warm reboot */
-	*((unsigned short *)__va(0x472)) = reboot_mode;
-       
-	for (;;) {
-		/* Could also try the reset bit in the Hammer NB */
-		switch (reboot_type) { 
-		case BOOT_KBD:
-		for (i=0; i<10; i++) {
-			kb_wait();
-			udelay(50);
-			outb(0xfe,0x64);         /* pulse reset low */
-			udelay(50);
-		}
-
-		case BOOT_TRIPLE: 
-			load_idt((const struct desc_ptr *)&no_idt);
-			__asm__ __volatile__("int3");
-
-			reboot_type = BOOT_KBD;
-			break;
-
-		case BOOT_ACPI:
-			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;
-		}
-	}      
-}
-
-void machine_restart(char * __unused)
-{
-	printk("machine restart\n");
-
-	if (!reboot_force) {
-		machine_shutdown();
-	}
-	machine_emergency_restart();
-}
-
-void machine_halt(void)
-{
-}
-
-void machine_power_off(void)
-{
-	if (pm_power_off) {
-		if (!reboot_force) {
-			machine_shutdown();
-		}
-		pm_power_off();
-	}
-}
-

include/asm-x86/emergency-restart.h

@@ -4,6 +4,9 @@
 enum reboot_type {
 	BOOT_TRIPLE = 't',
 	BOOT_KBD = 'k',
+#ifdef CONFIG_X86_32
+	BOOT_BIOS = 'b',
+#endif
 	BOOT_ACPI = 'a',
 	BOOT_EFI = 'e'
 };