mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Dave Jones](/assets/img/avatar_default.png)
Since the x86 merge, lots of files that referenced their own filenames are no longer correct. Rather than keep them up to date, just delete them, as they add no real value. Additionally: - fix up comment formatting in scx200_32.c - Remove a credit from myself in setup_64.c from a time when we had no SCM - remove longwinded history from tsc_32.c which can be figured out from git. Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
409 lines
12 KiB
C
409 lines
12 KiB
C
#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 <asm/apic.h>
|
|
#include <asm/desc.h>
|
|
#include "mach_reboot.h"
|
|
#include <asm/reboot_fixups.h>
|
|
#include <asm/reboot.h>
|
|
|
|
/*
|
|
* Power off function, if any
|
|
*/
|
|
void (*pm_power_off)(void);
|
|
EXPORT_SYMBOL(pm_power_off);
|
|
|
|
static int reboot_mode;
|
|
static int reboot_thru_bios;
|
|
|
|
#ifdef CONFIG_SMP
|
|
static int reboot_cpu = -1;
|
|
#endif
|
|
static int __init reboot_setup(char *str)
|
|
{
|
|
while(1) {
|
|
switch (*str) {
|
|
case 'w': /* "warm" reboot (no memory testing etc) */
|
|
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;
|
|
break;
|
|
#ifdef CONFIG_SMP
|
|
case 's': /* "smp" reboot by executing reset on BSP or other CPU*/
|
|
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 */
|
|
break;
|
|
#endif
|
|
}
|
|
if((str = strchr(str,',')) != NULL)
|
|
str++;
|
|
else
|
|
break;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
__setup("reboot=", reboot_setup);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int __init set_bios_reboot(const struct dmi_system_id *d)
|
|
{
|
|
if (!reboot_thru_bios) {
|
|
reboot_thru_bios = 1;
|
|
printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct dmi_system_id __initdata reboot_dmi_table[] = {
|
|
{ /* Handle problems with rebooting on Dell E520's */
|
|
.callback = set_bios_reboot,
|
|
.ident = "Dell E520",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
|
|
},
|
|
},
|
|
{ /* Handle problems with rebooting on Dell 1300's */
|
|
.callback = set_bios_reboot,
|
|
.ident = "Dell PowerEdge 1300",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
|
|
},
|
|
},
|
|
{ /* Handle problems with rebooting on Dell 300's */
|
|
.callback = set_bios_reboot,
|
|
.ident = "Dell PowerEdge 300",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
|
|
},
|
|
},
|
|
{ /* Handle problems with rebooting on Dell Optiplex 745's SFF*/
|
|
.callback = set_bios_reboot,
|
|
.ident = "Dell OptiPlex 745",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "0WF810"),
|
|
},
|
|
},
|
|
{ /* Handle problems with rebooting on Dell 2400's */
|
|
.callback = set_bios_reboot,
|
|
.ident = "Dell PowerEdge 2400",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
|
|
},
|
|
},
|
|
{ /* Handle problems with rebooting on HP laptops */
|
|
.callback = set_bios_reboot,
|
|
.ident = "HP Compaq Laptop",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
|
|
},
|
|
},
|
|
{ }
|
|
};
|
|
|
|
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
|
|
mode and jumping to the BIOS reset entry point, as if the CPU has
|
|
really been reset. The previous version asked the keyboard
|
|
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] =
|
|
{
|
|
0x0000000000000000ULL, /* Null descriptor */
|
|
0x00009a000000ffffULL, /* 16-bit real-mode 64k code at 0x00000000 */
|
|
0x000092000100ffffULL /* 16-bit real-mode 64k data at 0x00000100 */
|
|
};
|
|
|
|
static struct Xgt_desc_struct
|
|
real_mode_gdt = { sizeof (real_mode_gdt_entries) - 1, (long)real_mode_gdt_entries },
|
|
real_mode_idt = { 0x3ff, 0 },
|
|
no_idt = { 0, 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.
|
|
|
|
The instruction that switches to real mode by writing to CR0 must be
|
|
followed immediately by a far jump instruction, which set CS to a
|
|
valid value for real mode, and flushes the prefetch queue to avoid
|
|
running instructions that have already been decoded in protected
|
|
mode.
|
|
|
|
Clears all the flags except ET, especially PG (paging), PE
|
|
(protected-mode enable) and TS (task switch for coprocessor state
|
|
save). Flushes the TLB after paging has been disabled. Sets CD and
|
|
NW, to disable the cache on a 486, and invalidates the cache. This
|
|
is more like the state of a 486 after reset. I don't know if
|
|
something else should be done for other chips.
|
|
|
|
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 */
|
|
0x66, 0x83, 0xe0, 0x11, /* andl $0x00000011,%eax */
|
|
0x66, 0x0d, 0x00, 0x00, 0x00, 0x60, /* orl $0x60000000,%eax */
|
|
0x66, 0x0f, 0x22, 0xc0, /* movl %eax,%cr0 */
|
|
0x66, 0x0f, 0x22, 0xd8, /* movl %eax,%cr3 */
|
|
0x66, 0x0f, 0x20, 0xc3, /* movl %cr0,%ebx */
|
|
0x66, 0x81, 0xe3, 0x00, 0x00, 0x00, 0x60, /* andl $0x60000000,%ebx */
|
|
0x74, 0x02, /* jz f */
|
|
0x0f, 0x09, /* wbinvd */
|
|
0x24, 0x10, /* f: andb $0x10,al */
|
|
0x66, 0x0f, 0x22, 0xc0 /* movl %eax,%cr0 */
|
|
};
|
|
static unsigned char jump_to_bios [] =
|
|
{
|
|
0xea, 0x00, 0x00, 0xff, 0xff /* ljmp $0xffff,$0x0000 */
|
|
};
|
|
|
|
/*
|
|
* Switch to real mode and then execute the code
|
|
* specified by the code and length parameters.
|
|
* We assume that length will aways be less that 100!
|
|
*/
|
|
void machine_real_restart(unsigned char *code, int length)
|
|
{
|
|
local_irq_disable();
|
|
|
|
/* Write zero to CMOS register number 0x0f, which the BIOS POST
|
|
routine will recognize as telling it to do a proper reboot. (Well
|
|
that's what this book in front of me says -- it may only apply to
|
|
the Phoenix BIOS though, it's not clear). At the same time,
|
|
disable NMIs by setting the top bit in the CMOS address register,
|
|
as we're about to do peculiar things to the CPU. I'm not sure if
|
|
`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);
|
|
|
|
/* 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);
|
|
|
|
/*
|
|
* Use `swapper_pg_dir' as our page directory.
|
|
*/
|
|
load_cr3(swapper_pg_dir);
|
|
|
|
/* Write 0x1234 to absolute memory location 0x472. The BIOS reads
|
|
this on booting to tell it to "Bypass memory test (also warm
|
|
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
|
|
to be in the first 64k because it is running in 16-bit mode, and it
|
|
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
|
|
real mode. The base address of each segment is 0x100, 16 times the
|
|
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"
|
|
"\tmovl %%eax,%%fs\n"
|
|
"\tmovl %%eax,%%gs\n"
|
|
"\tmovl %%eax,%%ss" : : : "eax");
|
|
|
|
/* 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)));
|
|
}
|
|
#ifdef CONFIG_APM_MODULE
|
|
EXPORT_SYMBOL(machine_real_restart);
|
|
#endif
|
|
|
|
static void native_machine_shutdown(void)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
int reboot_cpu_id;
|
|
|
|
/* The boot cpu is always logical cpu 0 */
|
|
reboot_cpu_id = 0;
|
|
|
|
/* 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)) {
|
|
reboot_cpu_id = reboot_cpu;
|
|
}
|
|
|
|
/* Make certain the cpu I'm rebooting 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.
|
|
*/
|
|
|
|
smp_send_stop();
|
|
#endif /* CONFIG_SMP */
|
|
|
|
lapic_shutdown();
|
|
|
|
#ifdef CONFIG_X86_IO_APIC
|
|
disable_IO_APIC();
|
|
#endif
|
|
}
|
|
|
|
void __attribute__((weak)) mach_reboot_fixups(void)
|
|
{
|
|
}
|
|
|
|
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) {
|
|
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);
|
|
}
|
|
|
|
void machine_halt(void)
|
|
{
|
|
machine_ops.halt();
|
|
}
|