| #include <linux/module.h> |
| #include <linux/reboot.h> |
| #include <linux/init.h> |
| #include <linux/pm.h> |
| #include <linux/efi.h> |
| #include <linux/dmi.h> |
| #include <linux/sched.h> |
| #include <linux/tboot.h> |
| #include <linux/delay.h> |
| #include <acpi/reboot.h> |
| #include <asm/io.h> |
| #include <asm/apic.h> |
| #include <asm/desc.h> |
| #include <asm/hpet.h> |
| #include <asm/pgtable.h> |
| #include <asm/proto.h> |
| #include <asm/reboot_fixups.h> |
| #include <asm/reboot.h> |
| #include <asm/pci_x86.h> |
| #include <asm/virtext.h> |
| #include <asm/cpu.h> |
| #include <asm/nmi.h> |
| |
| #ifdef CONFIG_X86_32 |
| # include <linux/ctype.h> |
| # include <linux/mc146818rtc.h> |
| # include <asm/realmode.h> |
| #else |
| # include <asm/x86_init.h> |
| #endif |
| |
| /* |
| * Power off function, if any |
| */ |
| void (*pm_power_off)(void); |
| EXPORT_SYMBOL(pm_power_off); |
| |
| static const struct desc_ptr no_idt = {}; |
| static int reboot_mode; |
| enum reboot_type reboot_type = BOOT_ACPI; |
| int reboot_force; |
| |
| /* |
| * This variable is used privately to keep track of whether or not |
| * reboot_type is still set to its default value (i.e., reboot= hasn't |
| * been set on the command line). This is needed so that we can |
| * suppress DMI scanning for reboot quirks. Without it, it's |
| * impossible to override a faulty reboot quirk without recompiling. |
| */ |
| static int reboot_default = 1; |
| |
| #if defined(CONFIG_X86_32) && defined(CONFIG_SMP) |
| static int reboot_cpu = -1; |
| #endif |
| |
| /* |
| * This is set if we need to go through the 'emergency' path. |
| * When machine_emergency_restart() is called, we may be on |
| * an inconsistent state and won't be able to do a clean cleanup |
| */ |
| static int reboot_emergency; |
| |
| /* This is set by the PCI code if either type 1 or type 2 PCI is detected */ |
| bool port_cf9_safe = false; |
| |
| /* |
| * reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci] |
| * 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 |
| * pci Use the so-called "PCI reset register", CF9 |
| * force Avoid anything that could hang. |
| */ |
| static int __init reboot_setup(char *str) |
| { |
| for (;;) { |
| /* |
| * Having anything passed on the command line via |
| * reboot= will cause us to disable DMI checking |
| * below. |
| */ |
| reboot_default = 0; |
| |
| switch (*str) { |
| case 'w': |
| reboot_mode = 0x1234; |
| break; |
| |
| case 'c': |
| reboot_mode = 0; |
| break; |
| |
| #ifdef CONFIG_X86_32 |
| #ifdef CONFIG_SMP |
| 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 detected BSP APIC ID or smp_num_cpu |
| */ |
| break; |
| #endif /* CONFIG_SMP */ |
| |
| case 'b': |
| #endif |
| case 'a': |
| case 'k': |
| case 't': |
| case 'e': |
| case 'p': |
| reboot_type = *str; |
| break; |
| |
| case 'f': |
| reboot_force = 1; |
| break; |
| } |
| |
| str = strchr(str, ','); |
| if (str) |
| str++; |
| else |
| break; |
| } |
| return 1; |
| } |
| |
| __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" or "reboot=k" commandline options, |
| * this quirk makes that automatic. |
| */ |
| static int __init set_bios_reboot(const struct dmi_system_id *d) |
| { |
| 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; |
| } |
| |
| void machine_real_restart(unsigned int type) |
| { |
| void (*restart_lowmem)(unsigned int) = (void (*)(unsigned int)) |
| real_mode_header->machine_real_restart_asm; |
| |
| 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); |
| |
| /* |
| * Switch back to the initial page table. |
| */ |
| load_cr3(initial_page_table); |
| |
| /* |
| * 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; |
| |
| /* Jump to the identity-mapped low memory code */ |
| restart_lowmem(type); |
| } |
| #ifdef CONFIG_APM_MODULE |
| EXPORT_SYMBOL(machine_real_restart); |
| #endif |
| |
| #endif /* CONFIG_X86_32 */ |
| |
| /* |
| * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot |
| */ |
| static int __init set_pci_reboot(const struct dmi_system_id *d) |
| { |
| if (reboot_type != BOOT_CF9) { |
| reboot_type = BOOT_CF9; |
| printk(KERN_INFO "%s series board detected. " |
| "Selecting PCI-method for reboots.\n", d->ident); |
| } |
| return 0; |
| } |
| |
| static int __init set_kbd_reboot(const struct dmi_system_id *d) |
| { |
| if (reboot_type != BOOT_KBD) { |
| reboot_type = BOOT_KBD; |
| printk(KERN_INFO "%s series board detected. Selecting KBD-method for reboot.\n", d->ident); |
| } |
| return 0; |
| } |
| |
| /* |
| * This is a single dmi_table handling all reboot quirks. Note that |
| * REBOOT_BIOS is only available for 32bit |
| */ |
| static struct dmi_system_id __initdata reboot_dmi_table[] = { |
| #ifdef CONFIG_X86_32 |
| { /* 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"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Dell Optiplex 745's DFF */ |
| .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, "0MM599"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */ |
| .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, "0KW626"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */ |
| .callback = set_bios_reboot, |
| .ident = "Dell OptiPlex 330", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"), |
| DMI_MATCH(DMI_BOARD_NAME, "0KP561"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */ |
| .callback = set_bios_reboot, |
| .ident = "Dell OptiPlex 360", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"), |
| DMI_MATCH(DMI_BOARD_NAME, "0T656F"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */ |
| .callback = set_bios_reboot, |
| .ident = "Dell OptiPlex 760", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"), |
| DMI_MATCH(DMI_BOARD_NAME, "0G919G"), |
| }, |
| }, |
| { /* 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 Dell T5400's */ |
| .callback = set_bios_reboot, |
| .ident = "Dell Precision T5400", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Dell T7400's */ |
| .callback = set_bios_reboot, |
| .ident = "Dell Precision T7400", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"), |
| }, |
| }, |
| { /* 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"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Dell XPS710 */ |
| .callback = set_bios_reboot, |
| .ident = "Dell XPS710", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Dell DXP061 */ |
| .callback = set_bios_reboot, |
| .ident = "Dell DXP061", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Sony VGN-Z540N */ |
| .callback = set_bios_reboot, |
| .ident = "Sony VGN-Z540N", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"), |
| }, |
| }, |
| { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */ |
| .callback = set_bios_reboot, |
| .ident = "CompuLab SBC-FITPC2", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"), |
| }, |
| }, |
| { /* Handle problems with rebooting on ASUS P4S800 */ |
| .callback = set_bios_reboot, |
| .ident = "ASUS P4S800", |
| .matches = { |
| DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), |
| DMI_MATCH(DMI_BOARD_NAME, "P4S800"), |
| }, |
| }, |
| #endif /* CONFIG_X86_32 */ |
| |
| { /* Handle reboot issue on Acer Aspire one */ |
| .callback = set_kbd_reboot, |
| .ident = "Acer Aspire One A110", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Apple MacBook5 */ |
| .callback = set_pci_reboot, |
| .ident = "Apple MacBook5", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Apple MacBookPro5 */ |
| .callback = set_pci_reboot, |
| .ident = "Apple MacBookPro5", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Apple Macmini3,1 */ |
| .callback = set_pci_reboot, |
| .ident = "Apple Macmini3,1", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"), |
| }, |
| }, |
| { /* Handle problems with rebooting on the iMac9,1. */ |
| .callback = set_pci_reboot, |
| .ident = "Apple iMac9,1", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"), |
| }, |
| }, |
| { /* Handle problems with rebooting on the Latitude E6320. */ |
| .callback = set_pci_reboot, |
| .ident = "Dell Latitude E6320", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"), |
| }, |
| }, |
| { /* Handle problems with rebooting on the Latitude E5420. */ |
| .callback = set_pci_reboot, |
| .ident = "Dell Latitude E5420", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"), |
| }, |
| }, |
| { /* Handle problems with rebooting on the Latitude E6420. */ |
| .callback = set_pci_reboot, |
| .ident = "Dell Latitude E6420", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"), |
| }, |
| }, |
| { /* Handle problems with rebooting on the OptiPlex 990. */ |
| .callback = set_pci_reboot, |
| .ident = "Dell OptiPlex 990", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"), |
| }, |
| }, |
| { } |
| }; |
| |
| static int __init reboot_init(void) |
| { |
| /* |
| * Only do the DMI check if reboot_type hasn't been overridden |
| * on the command line |
| */ |
| if (reboot_default) |
| dmi_check_system(reboot_dmi_table); |
| return 0; |
| } |
| core_initcall(reboot_init); |
| |
| static inline void kb_wait(void) |
| { |
| int i; |
| |
| for (i = 0; i < 0x10000; i++) { |
| if ((inb(0x64) & 0x02) == 0) |
| break; |
| udelay(2); |
| } |
| } |
| |
| static void vmxoff_nmi(int cpu, struct pt_regs *regs) |
| { |
| cpu_emergency_vmxoff(); |
| } |
| |
| /* Use NMIs as IPIs to tell all CPUs to disable virtualization */ |
| static void emergency_vmx_disable_all(void) |
| { |
| /* Just make sure we won't change CPUs while doing this */ |
| local_irq_disable(); |
| |
| /* |
| * We need to disable VMX on all CPUs before rebooting, otherwise |
| * we risk hanging up the machine, because the CPU ignore INIT |
| * signals when VMX is enabled. |
| * |
| * We can't take any locks and we may be on an inconsistent |
| * state, so we use NMIs as IPIs to tell the other CPUs to disable |
| * VMX and halt. |
| * |
| * For safety, we will avoid running the nmi_shootdown_cpus() |
| * stuff unnecessarily, but we don't have a way to check |
| * if other CPUs have VMX enabled. So we will call it only if the |
| * CPU we are running on has VMX enabled. |
| * |
| * We will miss cases where VMX is not enabled on all CPUs. This |
| * shouldn't do much harm because KVM always enable VMX on all |
| * CPUs anyway. But we can miss it on the small window where KVM |
| * is still enabling VMX. |
| */ |
| if (cpu_has_vmx() && cpu_vmx_enabled()) { |
| /* Disable VMX on this CPU. */ |
| cpu_vmxoff(); |
| |
| /* Halt and disable VMX on the other CPUs */ |
| nmi_shootdown_cpus(vmxoff_nmi); |
| |
| } |
| } |
| |
| |
| void __attribute__((weak)) mach_reboot_fixups(void) |
| { |
| } |
| |
| /* |
| * Windows compatible x86 hardware expects the following on reboot: |
| * |
| * 1) If the FADT has the ACPI reboot register flag set, try it |
| * 2) If still alive, write to the keyboard controller |
| * 3) If still alive, write to the ACPI reboot register again |
| * 4) If still alive, write to the keyboard controller again |
| * |
| * If the machine is still alive at this stage, it gives up. We default to |
| * following the same pattern, except that if we're still alive after (4) we'll |
| * try to force a triple fault and then cycle between hitting the keyboard |
| * controller and doing that |
| */ |
| static void native_machine_emergency_restart(void) |
| { |
| int i; |
| int attempt = 0; |
| int orig_reboot_type = reboot_type; |
| |
| if (reboot_emergency) |
| emergency_vmx_disable_all(); |
| |
| tboot_shutdown(TB_SHUTDOWN_REBOOT); |
| |
| /* 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: |
| mach_reboot_fixups(); /* For board specific fixups */ |
| |
| for (i = 0; i < 10; i++) { |
| kb_wait(); |
| udelay(50); |
| outb(0xfe, 0x64); /* Pulse reset low */ |
| udelay(50); |
| } |
| if (attempt == 0 && orig_reboot_type == BOOT_ACPI) { |
| attempt = 1; |
| reboot_type = BOOT_ACPI; |
| } else { |
| reboot_type = BOOT_TRIPLE; |
| } |
| break; |
| |
| case BOOT_TRIPLE: |
| load_idt(&no_idt); |
| __asm__ __volatile__("int3"); |
| |
| reboot_type = BOOT_KBD; |
| break; |
| |
| #ifdef CONFIG_X86_32 |
| case BOOT_BIOS: |
| machine_real_restart(MRR_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; |
| |
| case BOOT_CF9: |
| port_cf9_safe = true; |
| /* Fall through */ |
| |
| case BOOT_CF9_COND: |
| if (port_cf9_safe) { |
| u8 cf9 = inb(0xcf9) & ~6; |
| outb(cf9|2, 0xcf9); /* Request hard reset */ |
| udelay(50); |
| outb(cf9|6, 0xcf9); /* Actually do the reset */ |
| udelay(50); |
| } |
| reboot_type = BOOT_KBD; |
| break; |
| } |
| } |
| } |
| |
| void native_machine_shutdown(void) |
| { |
| /* Stop the cpus and apics */ |
| #ifdef CONFIG_SMP |
| |
| /* The boot cpu is always logical cpu 0 */ |
| int 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_cpu_ids) && |
| cpu_online(reboot_cpu)) |
| reboot_cpu_id = reboot_cpu; |
| #endif |
| |
| /* Make certain the cpu I'm about to reboot on is online */ |
| if (!cpu_online(reboot_cpu_id)) |
| reboot_cpu_id = smp_processor_id(); |
| |
| /* Make certain I only run on the appropriate processor */ |
| set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id)); |
| |
| /* |
| * O.K Now that I'm on the appropriate processor, stop all of the |
| * others. Also disable the local irq to not receive the per-cpu |
| * timer interrupt which may trigger scheduler's load balance. |
| */ |
| local_irq_disable(); |
| stop_other_cpus(); |
| #endif |
| |
| lapic_shutdown(); |
| |
| #ifdef CONFIG_X86_IO_APIC |
| disable_IO_APIC(); |
| #endif |
| |
| #ifdef CONFIG_HPET_TIMER |
| hpet_disable(); |
| #endif |
| |
| #ifdef CONFIG_X86_64 |
| x86_platform.iommu_shutdown(); |
| #endif |
| } |
| |
| static void __machine_emergency_restart(int emergency) |
| { |
| reboot_emergency = emergency; |
| machine_ops.emergency_restart(); |
| } |
| |
| static void native_machine_restart(char *__unused) |
| { |
| printk("machine restart\n"); |
| |
| if (!reboot_force) |
| machine_shutdown(); |
| __machine_emergency_restart(0); |
| } |
| |
| static void native_machine_halt(void) |
| { |
| /* Stop other cpus and apics */ |
| machine_shutdown(); |
| |
| tboot_shutdown(TB_SHUTDOWN_HALT); |
| |
| stop_this_cpu(NULL); |
| } |
| |
| static void native_machine_power_off(void) |
| { |
| if (pm_power_off) { |
| if (!reboot_force) |
| machine_shutdown(); |
| pm_power_off(); |
| } |
| /* A fallback in case there is no PM info available */ |
| tboot_shutdown(TB_SHUTDOWN_HALT); |
| } |
| |
| 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, |
| #ifdef CONFIG_KEXEC |
| .crash_shutdown = native_machine_crash_shutdown, |
| #endif |
| }; |
| |
| void machine_power_off(void) |
| { |
| machine_ops.power_off(); |
| } |
| |
| void machine_shutdown(void) |
| { |
| machine_ops.shutdown(); |
| } |
| |
| void machine_emergency_restart(void) |
| { |
| __machine_emergency_restart(1); |
| } |
| |
| void machine_restart(char *cmd) |
| { |
| machine_ops.restart(cmd); |
| } |
| |
| void machine_halt(void) |
| { |
| machine_ops.halt(); |
| } |
| |
| #ifdef CONFIG_KEXEC |
| void machine_crash_shutdown(struct pt_regs *regs) |
| { |
| machine_ops.crash_shutdown(regs); |
| } |
| #endif |
| |
| |
| #if defined(CONFIG_SMP) |
| |
| /* This keeps a track of which one is crashing cpu. */ |
| static int crashing_cpu; |
| static nmi_shootdown_cb shootdown_callback; |
| |
| static atomic_t waiting_for_crash_ipi; |
| |
| static int crash_nmi_callback(unsigned int val, struct pt_regs *regs) |
| { |
| int cpu; |
| |
| cpu = raw_smp_processor_id(); |
| |
| /* |
| * Don't do anything if this handler is invoked on crashing cpu. |
| * Otherwise, system will completely hang. Crashing cpu can get |
| * an NMI if system was initially booted with nmi_watchdog parameter. |
| */ |
| if (cpu == crashing_cpu) |
| return NMI_HANDLED; |
| local_irq_disable(); |
| |
| shootdown_callback(cpu, regs); |
| |
| atomic_dec(&waiting_for_crash_ipi); |
| /* Assume hlt works */ |
| halt(); |
| for (;;) |
| cpu_relax(); |
| |
| return NMI_HANDLED; |
| } |
| |
| static void smp_send_nmi_allbutself(void) |
| { |
| apic->send_IPI_allbutself(NMI_VECTOR); |
| } |
| |
| /* |
| * 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. |
| */ |
| void nmi_shootdown_cpus(nmi_shootdown_cb callback) |
| { |
| unsigned long msecs; |
| local_irq_disable(); |
| |
| /* Make a note of crashing cpu. Will be used in NMI callback. */ |
| crashing_cpu = safe_smp_processor_id(); |
| |
| shootdown_callback = callback; |
| |
| atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); |
| /* Would it be better to replace the trap vector here? */ |
| if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback, |
| NMI_FLAG_FIRST, "crash")) |
| return; /* Return what? */ |
| /* |
| * Ensure the new callback function is set before sending |
| * out the NMI |
| */ |
| wmb(); |
| |
| smp_send_nmi_allbutself(); |
| |
| 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--; |
| } |
| |
| /* Leave the nmi callback set */ |
| } |
| #else /* !CONFIG_SMP */ |
| void nmi_shootdown_cpus(nmi_shootdown_cb callback) |
| { |
| /* No other CPUs to shoot down */ |
| } |
| #endif |