diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/kernel/reboot.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/kernel/reboot.c | 851 |
1 files changed, 0 insertions, 851 deletions
diff --git a/ANDROID_3.4.5/arch/x86/kernel/reboot.c b/ANDROID_3.4.5/arch/x86/kernel/reboot.c deleted file mode 100644 index 3034ee5a..00000000 --- a/ANDROID_3.4.5/arch/x86/kernel/reboot.c +++ /dev/null @@ -1,851 +0,0 @@ -#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> -#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; -} - -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; -} - -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"), - }, - }, - { /* 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"), - }, - }, - { /* 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"), - }, - }, - { } -}; - -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); - -extern const unsigned char machine_real_restart_asm[]; -extern const u64 machine_real_restart_gdt[3]; - -void machine_real_restart(unsigned int type) -{ - void *restart_va; - unsigned long restart_pa; - void (*restart_lowmem)(unsigned int); - u64 *lowmem_gdt; - - 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; - - /* Patch the GDT in the low memory trampoline */ - lowmem_gdt = TRAMPOLINE_SYM(machine_real_restart_gdt); - - restart_va = TRAMPOLINE_SYM(machine_real_restart_asm); - restart_pa = virt_to_phys(restart_va); - restart_lowmem = (void (*)(unsigned int))restart_pa; - - /* GDT[0]: GDT self-pointer */ - lowmem_gdt[0] = - (u64)(sizeof(machine_real_restart_gdt) - 1) + - ((u64)virt_to_phys(lowmem_gdt) << 16); - /* GDT[1]: 64K real mode code segment */ - lowmem_gdt[1] = - GDT_ENTRY(0x009b, restart_pa, 0xffff); - - /* 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 struct dmi_system_id __initdata pci_reboot_dmi_table[] = { - { /* 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"), - }, - }, - { /* Handle problems with rebooting on the Precision M6600. */ - .callback = set_pci_reboot, - .ident = "Dell OptiPlex 990", - .matches = { - DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), - DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"), - }, - }, - { } -}; - -static int __init pci_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(pci_reboot_dmi_table); - } - return 0; -} -core_initcall(pci_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. - */ - 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 */ - 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 |