1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
3 #include <linux/module.h>
4 #include <linux/reboot.h>
5 #include <linux/init.h>
9 #include <linux/sched.h>
10 #include <linux/tboot.h>
11 #include <linux/delay.h>
12 #include <acpi/reboot.h>
17 #include <asm/pgtable.h>
18 #include <asm/proto.h>
19 #include <asm/reboot_fixups.h>
20 #include <asm/reboot.h>
21 #include <asm/pci_x86.h>
22 #include <asm/virtext.h>
27 #include <linux/ctype.h>
28 #include <linux/mc146818rtc.h>
29 #include <asm/realmode.h>
30 #include <asm/x86_init.h>
33 * Power off function, if any
35 void (*pm_power_off)(void);
36 EXPORT_SYMBOL(pm_power_off);
38 static const struct desc_ptr no_idt = {};
41 * This is set if we need to go through the 'emergency' path.
42 * When machine_emergency_restart() is called, we may be on
43 * an inconsistent state and won't be able to do a clean cleanup
45 static int reboot_emergency;
47 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */
48 bool port_cf9_safe = false;
51 * Reboot options and system auto-detection code provided by
52 * Dell Inc. so their systems "just work". :-)
56 * Some machines require the "reboot=b" or "reboot=k" commandline options,
57 * this quirk makes that automatic.
59 static int __init set_bios_reboot(const struct dmi_system_id *d)
61 if (reboot_type != BOOT_BIOS) {
62 reboot_type = BOOT_BIOS;
63 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
69 void __noreturn machine_real_restart(unsigned int type)
74 * Write zero to CMOS register number 0x0f, which the BIOS POST
75 * routine will recognize as telling it to do a proper reboot. (Well
76 * that's what this book in front of me says -- it may only apply to
77 * the Phoenix BIOS though, it's not clear). At the same time,
78 * disable NMIs by setting the top bit in the CMOS address register,
79 * as we're about to do peculiar things to the CPU. I'm not sure if
80 * `outb_p' is needed instead of just `outb'. Use it to be on the
81 * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
84 CMOS_WRITE(0x00, 0x8f);
85 spin_unlock(&rtc_lock);
88 * Switch back to the initial page table.
91 load_cr3(initial_page_table);
93 write_cr3(real_mode_header->trampoline_pgd);
96 /* Jump to the identity-mapped low memory code */
98 asm volatile("jmpl *%0" : :
99 "rm" (real_mode_header->machine_real_restart_asm),
102 asm volatile("ljmpl *%0" : :
103 "m" (real_mode_header->machine_real_restart_asm),
108 #ifdef CONFIG_APM_MODULE
109 EXPORT_SYMBOL(machine_real_restart);
113 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
115 static int __init set_pci_reboot(const struct dmi_system_id *d)
117 if (reboot_type != BOOT_CF9_FORCE) {
118 reboot_type = BOOT_CF9_FORCE;
119 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
125 static int __init set_kbd_reboot(const struct dmi_system_id *d)
127 if (reboot_type != BOOT_KBD) {
128 reboot_type = BOOT_KBD;
129 pr_info("%s series board detected. Selecting %s-method for reboot.\n",
136 * This is a single dmi_table handling all reboot quirks.
138 static struct dmi_system_id __initdata reboot_dmi_table[] = {
141 { /* Handle reboot issue on Acer Aspire one */
142 .callback = set_kbd_reboot,
143 .ident = "Acer Aspire One A110",
145 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
146 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
151 { /* Handle problems with rebooting on Apple MacBook5 */
152 .callback = set_pci_reboot,
153 .ident = "Apple MacBook5",
155 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
156 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
159 { /* Handle problems with rebooting on Apple MacBookPro5 */
160 .callback = set_pci_reboot,
161 .ident = "Apple MacBookPro5",
163 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
164 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
167 { /* Handle problems with rebooting on Apple Macmini3,1 */
168 .callback = set_pci_reboot,
169 .ident = "Apple Macmini3,1",
171 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
172 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
175 { /* Handle problems with rebooting on the iMac9,1. */
176 .callback = set_pci_reboot,
177 .ident = "Apple iMac9,1",
179 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
180 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
185 { /* Handle problems with rebooting on ASUS P4S800 */
186 .callback = set_bios_reboot,
187 .ident = "ASUS P4S800",
189 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
190 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
195 { /* Handle problems with rebooting on Certec BPC600 */
196 .callback = set_pci_reboot,
197 .ident = "Certec BPC600",
199 DMI_MATCH(DMI_SYS_VENDOR, "Certec"),
200 DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"),
205 { /* Handle problems with rebooting on Dell DXP061 */
206 .callback = set_bios_reboot,
207 .ident = "Dell DXP061",
209 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
210 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
213 { /* Handle problems with rebooting on Dell E520's */
214 .callback = set_bios_reboot,
215 .ident = "Dell E520",
217 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
218 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
221 { /* Handle problems with rebooting on the Latitude E5410. */
222 .callback = set_pci_reboot,
223 .ident = "Dell Latitude E5410",
225 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
226 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"),
229 { /* Handle problems with rebooting on the Latitude E5420. */
230 .callback = set_pci_reboot,
231 .ident = "Dell Latitude E5420",
233 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
234 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
237 { /* Handle problems with rebooting on the Latitude E6320. */
238 .callback = set_pci_reboot,
239 .ident = "Dell Latitude E6320",
241 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
242 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
245 { /* Handle problems with rebooting on the Latitude E6420. */
246 .callback = set_pci_reboot,
247 .ident = "Dell Latitude E6420",
249 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
250 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
253 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
254 .callback = set_bios_reboot,
255 .ident = "Dell OptiPlex 330",
257 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
258 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
259 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
262 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
263 .callback = set_bios_reboot,
264 .ident = "Dell OptiPlex 360",
266 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
267 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
268 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
271 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */
272 .callback = set_bios_reboot,
273 .ident = "Dell OptiPlex 745",
275 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
276 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
279 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */
280 .callback = set_bios_reboot,
281 .ident = "Dell OptiPlex 745",
283 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
284 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
285 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
288 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
289 .callback = set_bios_reboot,
290 .ident = "Dell OptiPlex 745",
292 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
293 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
294 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
297 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
298 .callback = set_bios_reboot,
299 .ident = "Dell OptiPlex 760",
301 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
302 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
303 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
306 { /* Handle problems with rebooting on the OptiPlex 990. */
307 .callback = set_pci_reboot,
308 .ident = "Dell OptiPlex 990",
310 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
311 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
314 { /* Handle problems with rebooting on Dell 300's */
315 .callback = set_bios_reboot,
316 .ident = "Dell PowerEdge 300",
318 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
319 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
322 { /* Handle problems with rebooting on Dell 1300's */
323 .callback = set_bios_reboot,
324 .ident = "Dell PowerEdge 1300",
326 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
327 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
330 { /* Handle problems with rebooting on Dell 2400's */
331 .callback = set_bios_reboot,
332 .ident = "Dell PowerEdge 2400",
334 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
335 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
338 { /* Handle problems with rebooting on the Dell PowerEdge C6100. */
339 .callback = set_pci_reboot,
340 .ident = "Dell PowerEdge C6100",
342 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
343 DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
346 { /* Handle problems with rebooting on the Precision M6600. */
347 .callback = set_pci_reboot,
348 .ident = "Dell Precision M6600",
350 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
351 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
354 { /* Handle problems with rebooting on Dell T5400's */
355 .callback = set_bios_reboot,
356 .ident = "Dell Precision T5400",
358 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
359 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
362 { /* Handle problems with rebooting on Dell T7400's */
363 .callback = set_bios_reboot,
364 .ident = "Dell Precision T7400",
366 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
367 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
370 { /* Handle problems with rebooting on Dell XPS710 */
371 .callback = set_bios_reboot,
372 .ident = "Dell XPS710",
374 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
375 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
379 /* Hewlett-Packard */
380 { /* Handle problems with rebooting on HP laptops */
381 .callback = set_bios_reboot,
382 .ident = "HP Compaq Laptop",
384 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
385 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
390 { /* Handle problems with rebooting on Sony VGN-Z540N */
391 .callback = set_bios_reboot,
392 .ident = "Sony VGN-Z540N",
394 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
395 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
402 static int __init reboot_init(void)
405 * Only do the DMI check if reboot_type hasn't been overridden
406 * on the command line
409 dmi_check_system(reboot_dmi_table);
412 core_initcall(reboot_init);
414 static inline void kb_wait(void)
418 for (i = 0; i < 0x10000; i++) {
419 if ((inb(0x64) & 0x02) == 0)
425 static void vmxoff_nmi(int cpu, struct pt_regs *regs)
427 cpu_emergency_vmxoff();
430 /* Use NMIs as IPIs to tell all CPUs to disable virtualization */
431 static void emergency_vmx_disable_all(void)
433 /* Just make sure we won't change CPUs while doing this */
437 * We need to disable VMX on all CPUs before rebooting, otherwise
438 * we risk hanging up the machine, because the CPU ignore INIT
439 * signals when VMX is enabled.
441 * We can't take any locks and we may be on an inconsistent
442 * state, so we use NMIs as IPIs to tell the other CPUs to disable
445 * For safety, we will avoid running the nmi_shootdown_cpus()
446 * stuff unnecessarily, but we don't have a way to check
447 * if other CPUs have VMX enabled. So we will call it only if the
448 * CPU we are running on has VMX enabled.
450 * We will miss cases where VMX is not enabled on all CPUs. This
451 * shouldn't do much harm because KVM always enable VMX on all
452 * CPUs anyway. But we can miss it on the small window where KVM
453 * is still enabling VMX.
455 if (cpu_has_vmx() && cpu_vmx_enabled()) {
456 /* Disable VMX on this CPU. */
459 /* Halt and disable VMX on the other CPUs */
460 nmi_shootdown_cpus(vmxoff_nmi);
466 void __attribute__((weak)) mach_reboot_fixups(void)
471 * To the best of our knowledge Windows compatible x86 hardware expects
472 * the following on reboot:
474 * 1) If the FADT has the ACPI reboot register flag set, try it
475 * 2) If still alive, write to the keyboard controller
476 * 3) If still alive, write to the ACPI reboot register again
477 * 4) If still alive, write to the keyboard controller again
478 * 5) If still alive, call the EFI runtime service to reboot
479 * 6) If no EFI runtime service, call the BIOS to do a reboot
481 * We default to following the same pattern. We also have
482 * two other reboot methods: 'triple fault' and 'PCI', which
483 * can be triggered via the reboot= kernel boot option or
486 * This means that this function can never return, it can misbehave
487 * by not rebooting properly and hanging.
489 static void native_machine_emergency_restart(void)
493 int orig_reboot_type = reboot_type;
496 if (reboot_emergency)
497 emergency_vmx_disable_all();
499 tboot_shutdown(TB_SHUTDOWN_REBOOT);
501 /* Tell the BIOS if we want cold or warm reboot */
502 mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
503 *((unsigned short *)__va(0x472)) = mode;
506 /* Could also try the reset bit in the Hammer NB */
507 switch (reboot_type) {
510 reboot_type = BOOT_KBD;
514 mach_reboot_fixups(); /* For board specific fixups */
516 for (i = 0; i < 10; i++) {
519 outb(0xfe, 0x64); /* Pulse reset low */
522 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
524 reboot_type = BOOT_ACPI;
526 reboot_type = BOOT_EFI;
531 if (efi_enabled(EFI_RUNTIME_SERVICES))
532 efi.reset_system(reboot_mode == REBOOT_WARM ?
535 EFI_SUCCESS, 0, NULL);
536 reboot_type = BOOT_BIOS;
540 machine_real_restart(MRR_BIOS);
542 /* We're probably dead after this, but... */
543 reboot_type = BOOT_CF9_SAFE;
547 port_cf9_safe = true;
552 u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E;
553 u8 cf9 = inb(0xcf9) & ~reboot_code;
554 outb(cf9|2, 0xcf9); /* Request hard reset */
556 /* Actually do the reset */
557 outb(cf9|reboot_code, 0xcf9);
560 reboot_type = BOOT_TRIPLE;
565 __asm__ __volatile__("int3");
567 /* We're probably dead after this, but... */
568 reboot_type = BOOT_KBD;
574 void native_machine_shutdown(void)
576 /* Stop the cpus and apics */
577 #ifdef CONFIG_X86_IO_APIC
579 * Disabling IO APIC before local APIC is a workaround for
580 * erratum AVR31 in "Intel Atom Processor C2000 Product Family
581 * Specification Update". In this situation, interrupts that target
582 * a Logical Processor whose Local APIC is either in the process of
583 * being hardware disabled or software disabled are neither delivered
584 * nor discarded. When this erratum occurs, the processor may hang.
586 * Even without the erratum, it still makes sense to quiet IO APIC
587 * before disabling Local APIC.
594 * Stop all of the others. Also disable the local irq to
595 * not receive the per-cpu timer interrupt which may trigger
596 * scheduler's load balance.
604 #ifdef CONFIG_HPET_TIMER
609 x86_platform.iommu_shutdown();
613 static void __machine_emergency_restart(int emergency)
615 reboot_emergency = emergency;
616 machine_ops.emergency_restart();
619 static void native_machine_restart(char *__unused)
621 pr_notice("machine restart\n");
625 __machine_emergency_restart(0);
628 static void native_machine_halt(void)
630 /* Stop other cpus and apics */
633 tboot_shutdown(TB_SHUTDOWN_HALT);
638 static void native_machine_power_off(void)
645 /* A fallback in case there is no PM info available */
646 tboot_shutdown(TB_SHUTDOWN_HALT);
649 struct machine_ops machine_ops = {
650 .power_off = native_machine_power_off,
651 .shutdown = native_machine_shutdown,
652 .emergency_restart = native_machine_emergency_restart,
653 .restart = native_machine_restart,
654 .halt = native_machine_halt,
656 .crash_shutdown = native_machine_crash_shutdown,
660 void machine_power_off(void)
662 machine_ops.power_off();
665 void machine_shutdown(void)
667 machine_ops.shutdown();
670 void machine_emergency_restart(void)
672 __machine_emergency_restart(1);
675 void machine_restart(char *cmd)
677 machine_ops.restart(cmd);
680 void machine_halt(void)
686 void machine_crash_shutdown(struct pt_regs *regs)
688 machine_ops.crash_shutdown(regs);
693 #if defined(CONFIG_SMP)
695 /* This keeps a track of which one is crashing cpu. */
696 static int crashing_cpu;
697 static nmi_shootdown_cb shootdown_callback;
699 static atomic_t waiting_for_crash_ipi;
701 static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
705 cpu = raw_smp_processor_id();
708 * Don't do anything if this handler is invoked on crashing cpu.
709 * Otherwise, system will completely hang. Crashing cpu can get
710 * an NMI if system was initially booted with nmi_watchdog parameter.
712 if (cpu == crashing_cpu)
716 shootdown_callback(cpu, regs);
718 atomic_dec(&waiting_for_crash_ipi);
719 /* Assume hlt works */
727 static void smp_send_nmi_allbutself(void)
729 apic->send_IPI_allbutself(NMI_VECTOR);
733 * Halt all other CPUs, calling the specified function on each of them
735 * This function can be used to halt all other CPUs on crash
736 * or emergency reboot time. The function passed as parameter
737 * will be called inside a NMI handler on all CPUs.
739 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
744 /* Make a note of crashing cpu. Will be used in NMI callback. */
745 crashing_cpu = safe_smp_processor_id();
747 shootdown_callback = callback;
749 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
750 /* Would it be better to replace the trap vector here? */
751 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
752 NMI_FLAG_FIRST, "crash"))
753 return; /* Return what? */
755 * Ensure the new callback function is set before sending
760 smp_send_nmi_allbutself();
762 msecs = 1000; /* Wait at most a second for the other cpus to stop */
763 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
768 /* Leave the nmi callback set */
770 #else /* !CONFIG_SMP */
771 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
773 /* No other CPUs to shoot down */