x86: reboot_{32|64}.c unification (4d022e35) · Commits · e / devices / android_kernel_teracube_2e

arch/x86/kernel/Makefile

+2 −2

Original line number	Diff line number	Diff line
		@@ -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_32.c→arch/x86/kernel/reboot.c

+158 −122

Original line number	Diff line number	Diff line
		#include <linux/mm.h>
		#include <linux/module.h>
		#include <linux/delay.h>
		#include <linux/init.h>
		#include <linux/interrupt.h>
		#include <linux/mc146818rtc.h>
		#include <linux/efi.h>
		#include <linux/dmi.h>
		#include <linux/ctype.h>
		#include <linux/pm.h>
		#include <linux/reboot.h>
		#include <asm/uaccess.h>
		#include <linux/init.h>
		#include <linux/pm.h>
		#include <linux/efi.h>
		#include <acpi/reboot.h>
		#include <asm/io.h>
		#include <asm/apic.h>
		#include <asm/hpet.h>
		#include <asm/desc.h>
		#include "mach_reboot.h"
		#include <asm/hpet.h>
		#include <asm/reboot_fixups.h>
		#include <asm/reboot.h>

		#ifdef CONFIG_X86_32
		# include <linux/dmi.h>
		# include <linux/ctype.h>
		# include <linux/mc146818rtc.h>
		# include <asm/pgtable.h>
		#else
		# include <asm/iommu.h>
		#endif

		/*
		* Power off function, if any
		*/
		void (*pm_power_off)(void);
		EXPORT_SYMBOL(pm_power_off);

		static long no_idt[3];
		static int reboot_mode;
		static int reboot_thru_bios;
		enum reboot_type reboot_type = BOOT_KBD;
		int reboot_force;

		#ifdef CONFIG_SMP
		#if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
		static int reboot_cpu = -1;
		#endif

		/* reboot=b[ios] \| s[mp] \| t[riple] \| k[bd] \| e[fi] [, [w]arm \| [c]old]
		warm Don't set the cold reboot flag
		cold Set the cold reboot flag
		bios Reboot by jumping through the BIOS (only for X86_32)
		smp Reboot by executing reset on BSP or other CPU (only for X86_32)
		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)
		{
		while(1) {
		for (;;) {
		switch (*str) {
		case 'w': /* "warm" reboot (no memory testing etc) */
		case 'w':
		reboot_mode = 0x1234;
		break;
		case 'c': /* "cold" reboot (with memory testing etc) */
		reboot_mode = 0x0;
		break;
		case 'b': /* "bios" reboot by jumping through the BIOS */
		reboot_thru_bios = 1;
		break;
		case 'h': /* "hard" reboot by toggling RESET and/or crashing the CPU */
		reboot_thru_bios = 0;

		case 'c':
		reboot_mode = 0;
		break;

		#ifdef CONFIG_X86_32
		#ifdef CONFIG_SMP
		case 's': /* "smp" reboot by executing reset on BSP or other CPU*/
		case 's':
		if (isdigit(*(str+1))) {
		reboot_cpu = (int) (*(str+1) - '0');
		if (isdigit(*(str+2)))
		@@ -56,9 +71,24 @@ static int __init reboot_setup(char *str)
		when we are ready to reboot, since we might not
		have set up boot_cpu_id or smp_num_cpu */
		break;
		#endif /* CONFIG_SMP */

		case 'b':
		#endif
		case 'a':
		case 'k':
		case 't':
		case 'e':
		reboot_type = *str;
		break;

		case 'f':
		reboot_force = 1;
		break;
		}
		if((str = strchr(str,',')) != NULL)

		str = strchr(str, ',');
		if (str)
		str++;
		else
		break;
		@@ -68,18 +98,21 @@ static int __init reboot_setup(char *str)

		__setup("reboot=", reboot_setup);


		#ifdef CONFIG_X86_32
		/*
		* Reboot options and system auto-detection code provided by
		* Dell Inc. so their systems "just work". :-)
		*/

		/*
		* Some machines require the "reboot=b" commandline option, this quirk makes that automatic.
		* Some machines require the "reboot=b" commandline option,
		* this quirk makes that automatic.
		*/
		static int __init set_bios_reboot(const struct dmi_system_id *d)
		{
		if (!reboot_thru_bios) {
		reboot_thru_bios = 1;
		if (reboot_type != BOOT_BIOS) {
		reboot_type = BOOT_BIOS;
		printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident);
		}
		return 0;
		@@ -143,7 +176,6 @@ static int __init reboot_init(void)
		dmi_check_system(reboot_dmi_table);
		return 0;
		}

		core_initcall(reboot_init);

		/* The following code and data reboots the machine by switching to real
		@@ -152,7 +184,6 @@ core_initcall(reboot_init);
		controller to pulse the CPU reset line, which is more thorough, but
		doesn't work with at least one type of 486 motherboard. It is easy
		to stop this code working; hence the copious comments. */

		static unsigned long long
		real_mode_gdt_entries [3] =
		{
		@@ -163,9 +194,7 @@ real_mode_gdt_entries [3] =

		static struct desc_ptr
		real_mode_gdt = { sizeof (real_mode_gdt_entries) - 1, (long)real_mode_gdt_entries },
		real_mode_idt = { 0x3ff, 0 },
		no_idt = { 0, 0 };

		real_mode_idt = { 0x3ff, 0 };

		/* This is 16-bit protected mode code to disable paging and the cache,
		switch to real mode and jump to the BIOS reset code.
		@@ -185,7 +214,6 @@ no_idt = { 0, 0 };

		More could be done here to set up the registers as if a CPU reset had
		occurred; hopefully real BIOSs don't assume much. */

		static unsigned char real_mode_switch [] =
		{
		0x66, 0x0f, 0x20, 0xc0, /* movl %cr0,%eax */
		@@ -223,7 +251,6 @@ void machine_real_restart(unsigned char *code, int length)
		`outb_p' is needed instead of just `outb'. Use it to be on the
		safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
		*/

		spin_lock(&rtc_lock);
		CMOS_WRITE(0x00, 0x8f);
		spin_unlock(&rtc_lock);
		@@ -231,7 +258,6 @@ void machine_real_restart(unsigned char *code, int length)
		/* Remap the kernel at virtual address zero, as well as offset zero
		from the kernel segment. This assumes the kernel segment starts at
		virtual address PAGE_OFFSET. */

		memcpy(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS,
		sizeof(swapper_pg_dir [0]) * KERNEL_PGD_PTRS);

		@@ -245,7 +271,6 @@ void machine_real_restart(unsigned char *code, int length)
		boot)". This seems like a fairly standard thing that gets set by
		REBOOT.COM programs, and the previous reset routine did this
		too. */

		((unsigned short )0x472) = reboot_mode;

		/* For the switch to real mode, copy some code to low memory. It has
		@@ -253,19 +278,16 @@ void machine_real_restart(unsigned char *code, int length)
		has to have the same physical and virtual address, because it turns
		off paging. Copy it near the end of the first page, out of the way
		of BIOS variables. */

		memcpy((void *)(0x1000 - sizeof(real_mode_switch) - 100),
		real_mode_switch, sizeof (real_mode_switch));
		memcpy((void *)(0x1000 - 100), code, length);

		/* Set up the IDT for real mode. */

		load_idt(&real_mode_idt);

		/* Set up a GDT from which we can load segment descriptors for real
		mode. The GDT is not used in real mode; it is just needed here to
		prepare the descriptors. */

		load_gdt(&real_mode_gdt);

		/* Load the data segment registers, and thus the descriptors ready for
		@@ -273,7 +295,6 @@ void machine_real_restart(unsigned char *code, int length)
		selector value being loaded here. This is so that the segment
		registers don't have to be reloaded after switching to real mode:
		the values are consistent for real mode operation already. */

		__asm__ __volatile__ ("movl $0x0010,%%eax\n"
		"\tmovl %%eax,%%ds\n"
		"\tmovl %%eax,%%es\n"
		@@ -284,7 +305,6 @@ void machine_real_restart(unsigned char *code, int length)
		/* Jump to the 16-bit code that we copied earlier. It disables paging
		and the cache, switches to real mode, and jumps to the BIOS reset
		entry point. */

		__asm__ __volatile__ ("ljmp $0x0008,%0"
		:
		: "i" ((void *)(0x1000 - sizeof (real_mode_switch) - 100)));
		@@ -293,121 +313,137 @@ void machine_real_restart(unsigned char *code, int length)
		EXPORT_SYMBOL(machine_real_restart);
		#endif

		static void native_machine_shutdown(void)
		#endif /* CONFIG_X86_32 */

		static inline void kb_wait(void)
		{
		int i;

		for (i = 0; i < 0x10000; i++)
		if ((inb_p(0x64) & 0x02) == 0)
		break;
		}

		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;

		#ifdef CONFIG_X86_32
		case BOOT_BIOS:
		machine_real_restart(jump_to_bios, sizeof(jump_to_bios));

		reboot_type = BOOT_KBD;
		break;
		#endif

		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_shutdown(void)
		{
		/* Stop the cpus and apics */
		#ifdef CONFIG_SMP
		int reboot_cpu_id;

		/* The boot cpu is always logical cpu 0 */
		reboot_cpu_id = 0;

		#ifdef CONFIG_X86_32
		/* See if there has been given a command line override */
		if ((reboot_cpu != -1) && (reboot_cpu < NR_CPUS) &&
		cpu_isset(reboot_cpu, cpu_online_map)) {
		cpu_isset(reboot_cpu, cpu_online_map))
		reboot_cpu_id = reboot_cpu;
		}
		#endif

		/* Make certain the cpu I'm rebooting on is online */
		if (!cpu_isset(reboot_cpu_id, cpu_online_map)) {
		/* 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, and disable their local APICs.
		/* O.K Now that I'm on the appropriate processor,
		* stop all of the others.
		*/

		smp_send_stop();
		#endif /* CONFIG_SMP */
		#endif

		lapic_shutdown();

		#ifdef CONFIG_X86_IO_APIC
		disable_IO_APIC();
		#endif

		#ifdef CONFIG_HPET_TIMER
		hpet_disable();
		#endif
		}

		void __attribute__((weak)) mach_reboot_fixups(void)
		{
		#ifdef CONFIG_X86_64
		pci_iommu_shutdown();
		#endif
		}

		static void native_machine_emergency_restart(void)
		void machine_restart(char *__unused)
		{
		if (!reboot_thru_bios) {
		if (efi_enabled) {
		efi.reset_system(EFI_RESET_COLD, EFI_SUCCESS, 0, NULL);
		load_idt(&no_idt);
		__asm__ __volatile__("int3");
		}
		/* rebooting needs to touch the page at absolute addr 0 */
		((unsigned short )__va(0x472)) = reboot_mode;
		for (;;) {
		mach_reboot_fixups(); /* for board specific fixups */
		mach_reboot();
		/* That didn't work - force a triple fault.. */
		load_idt(&no_idt);
		__asm__ __volatile__("int3");
		}
		}
		if (efi_enabled)
		efi.reset_system(EFI_RESET_WARM, EFI_SUCCESS, 0, NULL);
		printk("machine restart\n");

		machine_real_restart(jump_to_bios, sizeof(jump_to_bios));
		}

		static void native_machine_restart(char * __unused)
		{
		if (!reboot_force)
		machine_shutdown();
		machine_emergency_restart();
		}

		static void native_machine_halt(void)
		void machine_halt(void)
		{
		}

		static void native_machine_power_off(void)
		void machine_power_off(void)
		{
		if (pm_power_off) {
		if (!reboot_force)
		machine_shutdown();
		pm_power_off();
		}
		}


		struct machine_ops machine_ops = {
		.power_off = native_machine_power_off,
		.shutdown = native_machine_shutdown,
		.emergency_restart = native_machine_emergency_restart,
		.restart = native_machine_restart,
		.halt = native_machine_halt,
		.power_off = machine_power_off,
		.shutdown = machine_shutdown,
		.emergency_restart = machine_emergency_restart,
		.restart = machine_restart,
		.halt = machine_halt
		};

		void machine_power_off(void)
		{
		machine_ops.power_off();
		}

		void machine_shutdown(void)
		{
		machine_ops.shutdown();
		}

		void machine_emergency_restart(void)
		{
		machine_ops.emergency_restart();
		}

		void machine_restart(char *cmd)
		{
		machine_ops.restart(cmd);
		}

		void machine_halt(void)
		{
		machine_ops.halt();
		}

arch/x86/kernel/reboot_64.c

deleted100644 → 0

+0 −191

Original line number	Diff line number	Diff line
		/* 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

+3 −0

Original line number	Diff line number	Diff line
		@@ -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'
		};