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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>
This commit is contained in:
Miguel Boton 2008-01-30 13:32:51 +01:00 committed by Ingo Molnar
parent 71c339116a
commit 4d022e35fd
4 changed files with 172 additions and 324 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/kernel/Makefile
View File

@ -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

298
arch/x86/kernel/reboot_32.c → arch/x86/kernel/reboot.c
View File

@ -1,64 +1,94 @@
#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)))
reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0');
}
/* we will leave sorting out the final value
when we are ready to reboot, since we might not
have set up boot_cpu_id or smp_num_cpu */
/* we will leave sorting out the final value
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);
@ -231,9 +258,8 @@ 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);
memcpy(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS,
sizeof(swapper_pg_dir [0]) * KERNEL_PGD_PTRS);
/*
* Use `swapper_pg_dir' as our page directory.
@ -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),
memcpy((void *)(0x1000 - sizeof(real_mode_switch) - 100),
real_mode_switch, sizeof (real_mode_switch));
memcpy ((void *) (0x1000 - 100), code, length);
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"
@ -284,130 +305,145 @@ 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)));
: "i" ((void *)(0x1000 - sizeof (real_mode_switch) - 100)));
}
#ifdef CONFIG_APM_MODULE
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
#ifdef CONFIG_X86_64
pci_iommu_shutdown();
#endif
}
void __attribute__((weak)) mach_reboot_fixups(void)
void machine_restart(char *__unused)
{
}
printk("machine restart\n");
static void native_machine_emergency_restart(void)
{
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);
machine_real_restart(jump_to_bios, sizeof(jump_to_bios));
}
static void native_machine_restart(char * __unused)
{
machine_shutdown();
machine_emergency_restart();
}
static void native_machine_halt(void)
{
}
static void native_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,
};
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);
machine_emergency_restart();
}
void machine_halt(void)
{
machine_ops.halt();
}
void machine_power_off(void)
{
if (pm_power_off) {
if (!reboot_force)
machine_shutdown();
pm_power_off();
}
}
struct machine_ops machine_ops = {
.power_off = machine_power_off,
.shutdown = machine_shutdown,
.emergency_restart = machine_emergency_restart,
.restart = machine_restart,
.halt = machine_halt
};

191
arch/x86/kernel/reboot_64.c
View File

@ -1,191 +0,0 @@
/* 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();
}
}

3
include/asm-x86/emergency-restart.h
View File

@ -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'
};