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910 lines
23 KiB
910 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/export.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 <linux/delay.h> |
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#include <linux/objtool.h> |
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#include <linux/pgtable.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/io_apic.h> |
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#include <asm/desc.h> |
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#include <asm/hpet.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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#include <asm/smp.h> |
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#include <linux/ctype.h> |
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#include <linux/mc146818rtc.h> |
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#include <asm/realmode.h> |
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#include <asm/x86_init.h> |
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#include <asm/efi.h> |
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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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/* |
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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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/* |
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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=a" commandline options |
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*/ |
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static int __init set_acpi_reboot(const struct dmi_system_id *d) |
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{ |
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if (reboot_type != BOOT_ACPI) { |
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reboot_type = BOOT_ACPI; |
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pr_info("%s series board detected. Selecting %s-method for reboots.\n", |
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d->ident, "ACPI"); |
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} |
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return 0; |
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} |
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/* |
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* Some machines require the "reboot=b" or "reboot=k" commandline options, |
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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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pr_info("%s series board detected. Selecting %s-method for reboots.\n", |
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d->ident, "BIOS"); |
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} |
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return 0; |
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} |
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/* |
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* Some machines don't handle the default ACPI reboot method and |
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* require the EFI reboot method: |
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*/ |
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static int __init set_efi_reboot(const struct dmi_system_id *d) |
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{ |
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if (reboot_type != BOOT_EFI && !efi_runtime_disabled()) { |
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reboot_type = BOOT_EFI; |
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pr_info("%s series board detected. Selecting EFI-method for reboot.\n", d->ident); |
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} |
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return 0; |
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} |
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void __noreturn machine_real_restart(unsigned int type) |
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{ |
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local_irq_disable(); |
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/* |
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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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#ifdef CONFIG_X86_32 |
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load_cr3(initial_page_table); |
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#else |
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write_cr3(real_mode_header->trampoline_pgd); |
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/* Exiting long mode will fail if CR4.PCIDE is set. */ |
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if (boot_cpu_has(X86_FEATURE_PCID)) |
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cr4_clear_bits(X86_CR4_PCIDE); |
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#endif |
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/* Jump to the identity-mapped low memory code */ |
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#ifdef CONFIG_X86_32 |
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asm volatile("jmpl *%0" : : |
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"rm" (real_mode_header->machine_real_restart_asm), |
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"a" (type)); |
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#else |
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asm volatile("ljmpl *%0" : : |
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"m" (real_mode_header->machine_real_restart_asm), |
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"D" (type)); |
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#endif |
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unreachable(); |
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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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STACK_FRAME_NON_STANDARD(machine_real_restart); |
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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_FORCE) { |
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reboot_type = BOOT_CF9_FORCE; |
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pr_info("%s series board detected. Selecting %s-method for reboots.\n", |
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d->ident, "PCI"); |
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} |
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return 0; |
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} |
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static int __init set_kbd_reboot(const struct dmi_system_id *d) |
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{ |
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if (reboot_type != BOOT_KBD) { |
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reboot_type = BOOT_KBD; |
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pr_info("%s series board detected. Selecting %s-method for reboot.\n", |
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d->ident, "KBD"); |
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} |
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return 0; |
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} |
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/* |
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* This is a single dmi_table handling all reboot quirks. |
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*/ |
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static const struct dmi_system_id reboot_dmi_table[] __initconst = { |
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/* Acer */ |
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{ /* Handle reboot issue on Acer Aspire one */ |
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.callback = set_kbd_reboot, |
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.ident = "Acer Aspire One A110", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"), |
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}, |
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}, |
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{ /* Handle reboot issue on Acer TravelMate X514-51T */ |
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.callback = set_efi_reboot, |
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.ident = "Acer TravelMate X514-51T", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate X514-51T"), |
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}, |
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}, |
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/* Apple */ |
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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 MacBook6,1 */ |
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.callback = set_pci_reboot, |
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.ident = "Apple MacBook6,1", |
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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, "MacBook6,1"), |
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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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{ /* Handle problems with rebooting on the iMac10,1. */ |
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.callback = set_pci_reboot, |
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.ident = "Apple iMac10,1", |
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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, "iMac10,1"), |
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}, |
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}, |
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/* ASRock */ |
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{ /* Handle problems with rebooting on ASRock Q1900DC-ITX */ |
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.callback = set_pci_reboot, |
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.ident = "ASRock Q1900DC-ITX", |
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.matches = { |
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DMI_MATCH(DMI_BOARD_VENDOR, "ASRock"), |
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DMI_MATCH(DMI_BOARD_NAME, "Q1900DC-ITX"), |
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}, |
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}, |
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/* ASUS */ |
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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 ASUS EeeBook X205TA */ |
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.callback = set_acpi_reboot, |
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.ident = "ASUS EeeBook X205TA", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), |
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DMI_MATCH(DMI_PRODUCT_NAME, "X205TA"), |
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}, |
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}, |
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{ /* Handle problems with rebooting on ASUS EeeBook X205TAW */ |
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.callback = set_acpi_reboot, |
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.ident = "ASUS EeeBook X205TAW", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), |
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DMI_MATCH(DMI_PRODUCT_NAME, "X205TAW"), |
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}, |
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}, |
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/* Certec */ |
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{ /* Handle problems with rebooting on Certec BPC600 */ |
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.callback = set_pci_reboot, |
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.ident = "Certec BPC600", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "Certec"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"), |
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}, |
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}, |
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/* Dell */ |
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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 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 the Latitude E5410. */ |
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.callback = set_pci_reboot, |
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.ident = "Dell Latitude E5410", |
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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, "Latitude E5410"), |
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}, |
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}, |
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{ /* Handle problems with rebooting on the Latitude E5420. */ |
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.callback = set_pci_reboot, |
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.ident = "Dell Latitude E5420", |
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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, "Latitude E5420"), |
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}, |
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}, |
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{ /* Handle problems with rebooting on the Latitude E6320. */ |
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.callback = set_pci_reboot, |
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.ident = "Dell Latitude E6320", |
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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, "Latitude E6320"), |
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}, |
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}, |
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{ /* Handle problems with rebooting on the Latitude E6420. */ |
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.callback = set_pci_reboot, |
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.ident = "Dell Latitude E6420", |
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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, "Latitude E6420"), |
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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 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 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 the OptiPlex 990. */ |
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.callback = set_pci_reboot, |
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.ident = "Dell OptiPlex 990", |
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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 990"), |
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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 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 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 the Dell PowerEdge C6100. */ |
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.callback = set_pci_reboot, |
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.ident = "Dell PowerEdge C6100", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "Dell"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "C6100"), |
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}, |
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}, |
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{ /* Handle problems with rebooting on the Precision M6600. */ |
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.callback = set_pci_reboot, |
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.ident = "Dell Precision M6600", |
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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 M6600"), |
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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 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 Optiplex 7450 AIO */ |
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.callback = set_acpi_reboot, |
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.ident = "Dell OptiPlex 7450 AIO", |
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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 7450 AIO"), |
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}, |
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}, |
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/* Hewlett-Packard */ |
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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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|
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{ /* PCIe Wifi card isn't detected after reboot otherwise */ |
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.callback = set_pci_reboot, |
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.ident = "Zotac ZBOX CI327 nano", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "NA"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "ZBOX-CI327NANO-GS-01"), |
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}, |
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}, |
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/* Sony */ |
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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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{ } |
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}; |
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static int __init reboot_init(void) |
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{ |
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int rv; |
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|
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/* |
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* Only do the DMI check if reboot_type hasn't been overridden |
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* on the command line |
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*/ |
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if (!reboot_default) |
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return 0; |
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|
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/* |
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* The DMI quirks table takes precedence. If no quirks entry |
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* matches and the ACPI Hardware Reduced bit is set and EFI |
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* runtime services are enabled, force EFI reboot. |
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*/ |
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rv = dmi_check_system(reboot_dmi_table); |
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|
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if (!rv && efi_reboot_required() && !efi_runtime_disabled()) |
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reboot_type = BOOT_EFI; |
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return 0; |
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} |
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core_initcall(reboot_init); |
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|
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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++) { |
|
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(); |
|
|
|
/* |
|
* Disable VMX on all CPUs before rebooting, otherwise we risk hanging |
|
* the machine, because the CPU blocks INIT when it's in VMX root. |
|
* |
|
* We can't take any locks and we may be on an inconsistent state, so |
|
* use NMIs as IPIs to tell the other CPUs to exit VMX root and halt. |
|
* |
|
* Do the NMI shootdown even if VMX if off on _this_ CPU, as that |
|
* doesn't prevent a different CPU from being in VMX root operation. |
|
*/ |
|
if (cpu_has_vmx()) { |
|
/* Safely force _this_ CPU out of VMX root operation. */ |
|
__cpu_emergency_vmxoff(); |
|
|
|
/* Halt and exit VMX root operation on the other CPUs. */ |
|
nmi_shootdown_cpus(vmxoff_nmi); |
|
} |
|
} |
|
|
|
|
|
void __attribute__((weak)) mach_reboot_fixups(void) |
|
{ |
|
} |
|
|
|
/* |
|
* To the best of our knowledge 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 |
|
* 5) If still alive, call the EFI runtime service to reboot |
|
* 6) If no EFI runtime service, call the BIOS to do a reboot |
|
* |
|
* We default to following the same pattern. We also have |
|
* two other reboot methods: 'triple fault' and 'PCI', which |
|
* can be triggered via the reboot= kernel boot option or |
|
* via quirks. |
|
* |
|
* This means that this function can never return, it can misbehave |
|
* by not rebooting properly and hanging. |
|
*/ |
|
static void native_machine_emergency_restart(void) |
|
{ |
|
int i; |
|
int attempt = 0; |
|
int orig_reboot_type = reboot_type; |
|
unsigned short mode; |
|
|
|
if (reboot_emergency) |
|
emergency_vmx_disable_all(); |
|
|
|
tboot_shutdown(TB_SHUTDOWN_REBOOT); |
|
|
|
/* Tell the BIOS if we want cold or warm reboot */ |
|
mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0; |
|
*((unsigned short *)__va(0x472)) = mode; |
|
|
|
/* |
|
* If an EFI capsule has been registered with the firmware then |
|
* override the reboot= parameter. |
|
*/ |
|
if (efi_capsule_pending(NULL)) { |
|
pr_info("EFI capsule is pending, forcing EFI reboot.\n"); |
|
reboot_type = BOOT_EFI; |
|
} |
|
|
|
for (;;) { |
|
/* Could also try the reset bit in the Hammer NB */ |
|
switch (reboot_type) { |
|
case BOOT_ACPI: |
|
acpi_reboot(); |
|
reboot_type = BOOT_KBD; |
|
break; |
|
|
|
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_EFI; |
|
} |
|
break; |
|
|
|
case BOOT_EFI: |
|
efi_reboot(reboot_mode, NULL); |
|
reboot_type = BOOT_BIOS; |
|
break; |
|
|
|
case BOOT_BIOS: |
|
machine_real_restart(MRR_BIOS); |
|
|
|
/* We're probably dead after this, but... */ |
|
reboot_type = BOOT_CF9_SAFE; |
|
break; |
|
|
|
case BOOT_CF9_FORCE: |
|
port_cf9_safe = true; |
|
fallthrough; |
|
|
|
case BOOT_CF9_SAFE: |
|
if (port_cf9_safe) { |
|
u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E; |
|
u8 cf9 = inb(0xcf9) & ~reboot_code; |
|
outb(cf9|2, 0xcf9); /* Request hard reset */ |
|
udelay(50); |
|
/* Actually do the reset */ |
|
outb(cf9|reboot_code, 0xcf9); |
|
udelay(50); |
|
} |
|
reboot_type = BOOT_TRIPLE; |
|
break; |
|
|
|
case BOOT_TRIPLE: |
|
idt_invalidate(NULL); |
|
__asm__ __volatile__("int3"); |
|
|
|
/* We're probably dead after this, but... */ |
|
reboot_type = BOOT_KBD; |
|
break; |
|
} |
|
} |
|
} |
|
|
|
void native_machine_shutdown(void) |
|
{ |
|
/* Stop the cpus and apics */ |
|
#ifdef CONFIG_X86_IO_APIC |
|
/* |
|
* Disabling IO APIC before local APIC is a workaround for |
|
* erratum AVR31 in "Intel Atom Processor C2000 Product Family |
|
* Specification Update". In this situation, interrupts that target |
|
* a Logical Processor whose Local APIC is either in the process of |
|
* being hardware disabled or software disabled are neither delivered |
|
* nor discarded. When this erratum occurs, the processor may hang. |
|
* |
|
* Even without the erratum, it still makes sense to quiet IO APIC |
|
* before disabling Local APIC. |
|
*/ |
|
clear_IO_APIC(); |
|
#endif |
|
|
|
#ifdef CONFIG_SMP |
|
/* |
|
* 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(); |
|
restore_boot_irq_mode(); |
|
|
|
#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) |
|
{ |
|
pr_notice("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 __ro_after_init = { |
|
.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_CORE |
|
.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_CORE |
|
void machine_crash_shutdown(struct pt_regs *regs) |
|
{ |
|
machine_ops.crash_shutdown(regs); |
|
} |
|
#endif |
|
|
|
|
|
/* This is the CPU performing the emergency shutdown work. */ |
|
int crashing_cpu = -1; |
|
|
|
#if defined(CONFIG_SMP) |
|
|
|
static nmi_shootdown_cb shootdown_callback; |
|
|
|
static atomic_t waiting_for_crash_ipi; |
|
static int crash_ipi_issued; |
|
|
|
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; |
|
} |
|
|
|
/* |
|
* 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(); |
|
|
|
apic_send_IPI_allbutself(NMI_VECTOR); |
|
|
|
/* Kick CPUs looping in NMI context. */ |
|
WRITE_ONCE(crash_ipi_issued, 1); |
|
|
|
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 */ |
|
} |
|
|
|
/* |
|
* Check if the crash dumping IPI got issued and if so, call its callback |
|
* directly. This function is used when we have already been in NMI handler. |
|
* It doesn't return. |
|
*/ |
|
void run_crash_ipi_callback(struct pt_regs *regs) |
|
{ |
|
if (crash_ipi_issued) |
|
crash_nmi_callback(0, regs); |
|
} |
|
|
|
/* Override the weak function in kernel/panic.c */ |
|
void nmi_panic_self_stop(struct pt_regs *regs) |
|
{ |
|
while (1) { |
|
/* If no CPU is preparing crash dump, we simply loop here. */ |
|
run_crash_ipi_callback(regs); |
|
cpu_relax(); |
|
} |
|
} |
|
|
|
#else /* !CONFIG_SMP */ |
|
void nmi_shootdown_cpus(nmi_shootdown_cb callback) |
|
{ |
|
/* No other CPUs to shoot down */ |
|
} |
|
|
|
void run_crash_ipi_callback(struct pt_regs *regs) |
|
{ |
|
} |
|
#endif
|
|
|