e7fd3b4669
* 'x86-trampoline-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86: Fix binutils-2.21 symbol related build failures x86-64, trampoline: Remove unused variable x86, reboot: Fix the use of passed arguments in 32-bit BIOS reboot x86, reboot: Move the real-mode reboot code to an assembly file x86: Make the GDT_ENTRY() macro in <asm/segment.h> safe for assembly x86, trampoline: Use the unified trampoline setup for ACPI wakeup x86, trampoline: Common infrastructure for low memory trampolines Fix up trivial conflicts in arch/x86/kernel/Makefile
764 lines
18 KiB
C
764 lines
18 KiB
C
#include <linux/module.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/pm.h>
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#include <linux/efi.h>
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#include <linux/dmi.h>
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#include <linux/sched.h>
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#include <linux/tboot.h>
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#include <acpi/reboot.h>
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#include <asm/io.h>
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#include <asm/apic.h>
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#include <asm/desc.h>
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#include <asm/hpet.h>
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#include <asm/pgtable.h>
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#include <asm/proto.h>
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#include <asm/reboot_fixups.h>
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#include <asm/reboot.h>
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#include <asm/pci_x86.h>
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#include <asm/virtext.h>
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#include <asm/cpu.h>
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#include <asm/nmi.h>
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#ifdef CONFIG_X86_32
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# include <linux/ctype.h>
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# include <linux/mc146818rtc.h>
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#else
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# include <asm/x86_init.h>
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#endif
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/*
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* Power off function, if any
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*/
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void (*pm_power_off)(void);
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EXPORT_SYMBOL(pm_power_off);
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static const struct desc_ptr no_idt = {};
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static int reboot_mode;
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enum reboot_type reboot_type = BOOT_KBD;
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int reboot_force;
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#if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
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static int reboot_cpu = -1;
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#endif
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/* This is set if we need to go through the 'emergency' path.
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* When machine_emergency_restart() is called, we may be on
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* an inconsistent state and won't be able to do a clean cleanup
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*/
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static int reboot_emergency;
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/* This is set by the PCI code if either type 1 or type 2 PCI is detected */
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bool port_cf9_safe = false;
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/* reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
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warm Don't set the cold reboot flag
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cold Set the cold reboot flag
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bios Reboot by jumping through the BIOS (only for X86_32)
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smp Reboot by executing reset on BSP or other CPU (only for X86_32)
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triple Force a triple fault (init)
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kbd Use the keyboard controller. cold reset (default)
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acpi Use the RESET_REG in the FADT
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efi Use efi reset_system runtime service
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pci Use the so-called "PCI reset register", CF9
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force Avoid anything that could hang.
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*/
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static int __init reboot_setup(char *str)
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{
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for (;;) {
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switch (*str) {
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case 'w':
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reboot_mode = 0x1234;
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break;
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case 'c':
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reboot_mode = 0;
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break;
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#ifdef CONFIG_X86_32
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#ifdef CONFIG_SMP
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case 's':
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if (isdigit(*(str+1))) {
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reboot_cpu = (int) (*(str+1) - '0');
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if (isdigit(*(str+2)))
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reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0');
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}
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/* we will leave sorting out the final value
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when we are ready to reboot, since we might not
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have detected BSP APIC ID or smp_num_cpu */
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break;
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#endif /* CONFIG_SMP */
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case 'b':
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#endif
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case 'a':
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case 'k':
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case 't':
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case 'e':
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case 'p':
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reboot_type = *str;
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break;
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case 'f':
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reboot_force = 1;
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break;
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}
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str = strchr(str, ',');
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if (str)
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str++;
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else
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break;
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}
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return 1;
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}
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__setup("reboot=", reboot_setup);
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#ifdef CONFIG_X86_32
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/*
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* Reboot options and system auto-detection code provided by
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* Dell Inc. so their systems "just work". :-)
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*/
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/*
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* Some machines require the "reboot=b" commandline option,
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* this quirk makes that automatic.
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*/
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static int __init set_bios_reboot(const struct dmi_system_id *d)
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{
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if (reboot_type != BOOT_BIOS) {
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reboot_type = BOOT_BIOS;
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printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident);
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}
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return 0;
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}
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static struct dmi_system_id __initdata reboot_dmi_table[] = {
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{ /* Handle problems with rebooting on Dell E520's */
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.callback = set_bios_reboot,
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.ident = "Dell E520",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
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},
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},
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{ /* Handle problems with rebooting on Dell 1300's */
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.callback = set_bios_reboot,
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.ident = "Dell PowerEdge 1300",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
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},
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},
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{ /* Handle problems with rebooting on Dell 300's */
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.callback = set_bios_reboot,
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.ident = "Dell PowerEdge 300",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
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},
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},
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{ /* Handle problems with rebooting on Dell Optiplex 745's SFF*/
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.callback = set_bios_reboot,
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.ident = "Dell OptiPlex 745",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
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},
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},
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{ /* Handle problems with rebooting on Dell Optiplex 745's DFF*/
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.callback = set_bios_reboot,
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.ident = "Dell OptiPlex 745",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
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DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
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},
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},
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{ /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
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.callback = set_bios_reboot,
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.ident = "Dell OptiPlex 745",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
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DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
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},
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},
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{ /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
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.callback = set_bios_reboot,
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.ident = "Dell OptiPlex 330",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
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DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
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},
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},
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{ /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
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.callback = set_bios_reboot,
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.ident = "Dell OptiPlex 360",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
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DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
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},
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},
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{ /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G*/
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.callback = set_bios_reboot,
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.ident = "Dell OptiPlex 760",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
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DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
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},
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},
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{ /* Handle problems with rebooting on Dell 2400's */
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.callback = set_bios_reboot,
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.ident = "Dell PowerEdge 2400",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
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},
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},
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{ /* Handle problems with rebooting on Dell T5400's */
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.callback = set_bios_reboot,
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.ident = "Dell Precision T5400",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
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},
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},
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{ /* Handle problems with rebooting on Dell T7400's */
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.callback = set_bios_reboot,
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.ident = "Dell Precision T7400",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
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},
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},
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{ /* Handle problems with rebooting on HP laptops */
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.callback = set_bios_reboot,
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.ident = "HP Compaq Laptop",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
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},
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},
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{ /* Handle problems with rebooting on Dell XPS710 */
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.callback = set_bios_reboot,
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.ident = "Dell XPS710",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
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},
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},
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{ /* Handle problems with rebooting on Dell DXP061 */
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.callback = set_bios_reboot,
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.ident = "Dell DXP061",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
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},
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},
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{ /* Handle problems with rebooting on Sony VGN-Z540N */
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.callback = set_bios_reboot,
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.ident = "Sony VGN-Z540N",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
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DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
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},
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},
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{ /* Handle problems with rebooting on CompuLab SBC-FITPC2 */
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.callback = set_bios_reboot,
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.ident = "CompuLab SBC-FITPC2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"),
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DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"),
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},
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},
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{ /* Handle problems with rebooting on ASUS P4S800 */
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.callback = set_bios_reboot,
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.ident = "ASUS P4S800",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
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DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
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},
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},
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{ /* Handle problems with rebooting on VersaLogic Menlow boards */
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.callback = set_bios_reboot,
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.ident = "VersaLogic Menlow based board",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "VersaLogic Corporation"),
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DMI_MATCH(DMI_BOARD_NAME, "VersaLogic Menlow board"),
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},
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},
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{ }
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};
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static int __init reboot_init(void)
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{
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dmi_check_system(reboot_dmi_table);
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return 0;
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}
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core_initcall(reboot_init);
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extern const unsigned char machine_real_restart_asm[];
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extern const u64 machine_real_restart_gdt[3];
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void machine_real_restart(unsigned int type)
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{
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void *restart_va;
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unsigned long restart_pa;
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void (*restart_lowmem)(unsigned int);
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u64 *lowmem_gdt;
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local_irq_disable();
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/* Write zero to CMOS register number 0x0f, which the BIOS POST
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routine will recognize as telling it to do a proper reboot. (Well
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that's what this book in front of me says -- it may only apply to
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the Phoenix BIOS though, it's not clear). At the same time,
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disable NMIs by setting the top bit in the CMOS address register,
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as we're about to do peculiar things to the CPU. I'm not sure if
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`outb_p' is needed instead of just `outb'. Use it to be on the
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safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
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*/
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spin_lock(&rtc_lock);
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CMOS_WRITE(0x00, 0x8f);
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spin_unlock(&rtc_lock);
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/*
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* Switch back to the initial page table.
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*/
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load_cr3(initial_page_table);
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/* Write 0x1234 to absolute memory location 0x472. The BIOS reads
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this on booting to tell it to "Bypass memory test (also warm
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boot)". This seems like a fairly standard thing that gets set by
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REBOOT.COM programs, and the previous reset routine did this
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too. */
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*((unsigned short *)0x472) = reboot_mode;
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/* Patch the GDT in the low memory trampoline */
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lowmem_gdt = TRAMPOLINE_SYM(machine_real_restart_gdt);
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restart_va = TRAMPOLINE_SYM(machine_real_restart_asm);
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restart_pa = virt_to_phys(restart_va);
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restart_lowmem = (void (*)(unsigned int))restart_pa;
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/* GDT[0]: GDT self-pointer */
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lowmem_gdt[0] =
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(u64)(sizeof(machine_real_restart_gdt) - 1) +
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((u64)virt_to_phys(lowmem_gdt) << 16);
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/* GDT[1]: 64K real mode code segment */
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lowmem_gdt[1] =
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GDT_ENTRY(0x009b, restart_pa, 0xffff);
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/* Jump to the identity-mapped low memory code */
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restart_lowmem(type);
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}
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#ifdef CONFIG_APM_MODULE
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EXPORT_SYMBOL(machine_real_restart);
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#endif
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#endif /* CONFIG_X86_32 */
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/*
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* Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
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*/
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static int __init set_pci_reboot(const struct dmi_system_id *d)
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{
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if (reboot_type != BOOT_CF9) {
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reboot_type = BOOT_CF9;
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printk(KERN_INFO "%s series board detected. "
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"Selecting PCI-method for reboots.\n", d->ident);
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}
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return 0;
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}
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static struct dmi_system_id __initdata pci_reboot_dmi_table[] = {
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{ /* Handle problems with rebooting on Apple MacBook5 */
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.callback = set_pci_reboot,
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.ident = "Apple MacBook5",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
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},
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},
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{ /* Handle problems with rebooting on Apple MacBookPro5 */
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.callback = set_pci_reboot,
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.ident = "Apple MacBookPro5",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
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},
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},
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{ /* Handle problems with rebooting on Apple Macmini3,1 */
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.callback = set_pci_reboot,
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.ident = "Apple Macmini3,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
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},
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},
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{ /* Handle problems with rebooting on the iMac9,1. */
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.callback = set_pci_reboot,
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.ident = "Apple iMac9,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
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},
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},
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{ }
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};
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static int __init pci_reboot_init(void)
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{
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dmi_check_system(pci_reboot_dmi_table);
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return 0;
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}
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core_initcall(pci_reboot_init);
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static inline void kb_wait(void)
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{
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int i;
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for (i = 0; i < 0x10000; i++) {
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if ((inb(0x64) & 0x02) == 0)
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break;
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udelay(2);
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}
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}
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static void vmxoff_nmi(int cpu, struct die_args *args)
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{
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cpu_emergency_vmxoff();
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}
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/* Use NMIs as IPIs to tell all CPUs to disable virtualization
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*/
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static void emergency_vmx_disable_all(void)
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{
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/* Just make sure we won't change CPUs while doing this */
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local_irq_disable();
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/* We need to disable VMX on all CPUs before rebooting, otherwise
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* we risk hanging up the machine, because the CPU ignore INIT
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* signals when VMX is enabled.
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*
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* We can't take any locks and we may be on an inconsistent
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* state, so we use NMIs as IPIs to tell the other CPUs to disable
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* VMX and halt.
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*
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* For safety, we will avoid running the nmi_shootdown_cpus()
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* stuff unnecessarily, but we don't have a way to check
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* if other CPUs have VMX enabled. So we will call it only if the
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* CPU we are running on has VMX enabled.
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*
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* We will miss cases where VMX is not enabled on all CPUs. This
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* shouldn't do much harm because KVM always enable VMX on all
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* CPUs anyway. But we can miss it on the small window where KVM
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* is still enabling VMX.
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*/
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if (cpu_has_vmx() && cpu_vmx_enabled()) {
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/* Disable VMX on this CPU.
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*/
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cpu_vmxoff();
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/* Halt and disable VMX on the other CPUs */
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nmi_shootdown_cpus(vmxoff_nmi);
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}
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}
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void __attribute__((weak)) mach_reboot_fixups(void)
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{
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}
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static void native_machine_emergency_restart(void)
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{
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int i;
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if (reboot_emergency)
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emergency_vmx_disable_all();
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tboot_shutdown(TB_SHUTDOWN_REBOOT);
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/* Tell the BIOS if we want cold or warm reboot */
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*((unsigned short *)__va(0x472)) = reboot_mode;
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for (;;) {
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/* Could also try the reset bit in the Hammer NB */
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switch (reboot_type) {
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case BOOT_KBD:
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mach_reboot_fixups(); /* for board specific fixups */
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for (i = 0; i < 10; i++) {
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kb_wait();
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udelay(50);
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outb(0xfe, 0x64); /* pulse reset low */
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udelay(50);
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}
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case BOOT_TRIPLE:
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load_idt(&no_idt);
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__asm__ __volatile__("int3");
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reboot_type = BOOT_KBD;
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break;
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#ifdef CONFIG_X86_32
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case BOOT_BIOS:
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machine_real_restart(MRR_BIOS);
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reboot_type = BOOT_KBD;
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break;
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#endif
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case BOOT_ACPI:
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acpi_reboot();
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reboot_type = BOOT_KBD;
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break;
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case BOOT_EFI:
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if (efi_enabled)
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efi.reset_system(reboot_mode ?
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EFI_RESET_WARM :
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EFI_RESET_COLD,
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EFI_SUCCESS, 0, NULL);
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reboot_type = BOOT_KBD;
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break;
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case BOOT_CF9:
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port_cf9_safe = true;
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/* fall through */
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case BOOT_CF9_COND:
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if (port_cf9_safe) {
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u8 cf9 = inb(0xcf9) & ~6;
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outb(cf9|2, 0xcf9); /* Request hard reset */
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udelay(50);
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outb(cf9|6, 0xcf9); /* Actually do the reset */
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udelay(50);
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}
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reboot_type = BOOT_KBD;
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break;
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}
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}
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}
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void native_machine_shutdown(void)
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{
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/* Stop the cpus and apics */
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#ifdef CONFIG_SMP
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/* The boot cpu is always logical cpu 0 */
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int reboot_cpu_id = 0;
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#ifdef CONFIG_X86_32
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/* See if there has been given a command line override */
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if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
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cpu_online(reboot_cpu))
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reboot_cpu_id = reboot_cpu;
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#endif
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/* Make certain the cpu I'm about to reboot on is online */
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if (!cpu_online(reboot_cpu_id))
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reboot_cpu_id = smp_processor_id();
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/* Make certain I only run on the appropriate processor */
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set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
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/* O.K Now that I'm on the appropriate processor,
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* stop all of the others.
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*/
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stop_other_cpus();
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#endif
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lapic_shutdown();
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#ifdef CONFIG_X86_IO_APIC
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disable_IO_APIC();
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#endif
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#ifdef CONFIG_HPET_TIMER
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hpet_disable();
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#endif
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#ifdef CONFIG_X86_64
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x86_platform.iommu_shutdown();
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#endif
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}
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static void __machine_emergency_restart(int emergency)
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{
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reboot_emergency = emergency;
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machine_ops.emergency_restart();
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}
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static void native_machine_restart(char *__unused)
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{
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printk("machine restart\n");
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if (!reboot_force)
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machine_shutdown();
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__machine_emergency_restart(0);
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}
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static void native_machine_halt(void)
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{
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/* stop other cpus and apics */
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machine_shutdown();
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tboot_shutdown(TB_SHUTDOWN_HALT);
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/* stop this cpu */
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stop_this_cpu(NULL);
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}
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static void native_machine_power_off(void)
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{
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if (pm_power_off) {
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if (!reboot_force)
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machine_shutdown();
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pm_power_off();
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}
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/* a fallback in case there is no PM info available */
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tboot_shutdown(TB_SHUTDOWN_HALT);
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}
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struct machine_ops machine_ops = {
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.power_off = native_machine_power_off,
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.shutdown = native_machine_shutdown,
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.emergency_restart = native_machine_emergency_restart,
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.restart = native_machine_restart,
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.halt = native_machine_halt,
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#ifdef CONFIG_KEXEC
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.crash_shutdown = native_machine_crash_shutdown,
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#endif
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};
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void machine_power_off(void)
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{
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machine_ops.power_off();
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}
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void machine_shutdown(void)
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{
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machine_ops.shutdown();
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}
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void machine_emergency_restart(void)
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{
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__machine_emergency_restart(1);
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}
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void machine_restart(char *cmd)
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{
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machine_ops.restart(cmd);
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}
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void machine_halt(void)
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{
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machine_ops.halt();
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}
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#ifdef CONFIG_KEXEC
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void machine_crash_shutdown(struct pt_regs *regs)
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{
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machine_ops.crash_shutdown(regs);
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}
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#endif
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|
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#if defined(CONFIG_SMP)
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/* This keeps a track of which one is crashing cpu. */
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static int crashing_cpu;
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static nmi_shootdown_cb shootdown_callback;
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static atomic_t waiting_for_crash_ipi;
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static int crash_nmi_callback(struct notifier_block *self,
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unsigned long val, void *data)
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{
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int cpu;
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if (val != DIE_NMI)
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return NOTIFY_OK;
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cpu = raw_smp_processor_id();
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/* Don't do anything if this handler is invoked on crashing cpu.
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* Otherwise, system will completely hang. Crashing cpu can get
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* an NMI if system was initially booted with nmi_watchdog parameter.
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*/
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if (cpu == crashing_cpu)
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return NOTIFY_STOP;
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local_irq_disable();
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shootdown_callback(cpu, (struct die_args *)data);
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atomic_dec(&waiting_for_crash_ipi);
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/* Assume hlt works */
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halt();
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for (;;)
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cpu_relax();
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return 1;
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}
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|
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static void smp_send_nmi_allbutself(void)
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|
{
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|
apic->send_IPI_allbutself(NMI_VECTOR);
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}
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|
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static struct notifier_block crash_nmi_nb = {
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|
.notifier_call = crash_nmi_callback,
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/* we want to be the first one called */
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|
.priority = NMI_LOCAL_HIGH_PRIOR+1,
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};
|
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|
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/* Halt all other CPUs, calling the specified function on each of them
|
|
*
|
|
* This function can be used to halt all other CPUs on crash
|
|
* or emergency reboot time. The function passed as parameter
|
|
* will be called inside a NMI handler on all CPUs.
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|
*/
|
|
void nmi_shootdown_cpus(nmi_shootdown_cb callback)
|
|
{
|
|
unsigned long msecs;
|
|
local_irq_disable();
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|
|
/* Make a note of crashing cpu. Will be used in NMI callback.*/
|
|
crashing_cpu = safe_smp_processor_id();
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shootdown_callback = callback;
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|
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atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
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|
/* Would it be better to replace the trap vector here? */
|
|
if (register_die_notifier(&crash_nmi_nb))
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|
return; /* return what? */
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/* Ensure the new callback function is set before sending
|
|
* out the NMI
|
|
*/
|
|
wmb();
|
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|
|
smp_send_nmi_allbutself();
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|
|
msecs = 1000; /* Wait at most a second for the other cpus to stop */
|
|
while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
|
|
mdelay(1);
|
|
msecs--;
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}
|
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|
|
/* Leave the nmi callback set */
|
|
}
|
|
#else /* !CONFIG_SMP */
|
|
void nmi_shootdown_cpus(nmi_shootdown_cb callback)
|
|
{
|
|
/* No other CPUs to shoot down */
|
|
}
|
|
#endif
|