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>
15 #include <asm/io_apic.h>
18 #include <asm/pgtable.h>
19 #include <asm/proto.h>
20 #include <asm/reboot_fixups.h>
21 #include <asm/reboot.h>
22 #include <asm/pci_x86.h>
23 #include <asm/virtext.h>
28 #include <linux/ctype.h>
29 #include <linux/mc146818rtc.h>
30 #include <asm/realmode.h>
31 #include <asm/x86_init.h>
35 * Power off function, if any
37 void (*pm_power_off)(void);
38 EXPORT_SYMBOL(pm_power_off);
40 static const struct desc_ptr no_idt = {};
43 * This is set if we need to go through the 'emergency' path.
44 * When machine_emergency_restart() is called, we may be on
45 * an inconsistent state and won't be able to do a clean cleanup
47 static int reboot_emergency;
49 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */
50 bool port_cf9_safe = false;
53 * Reboot options and system auto-detection code provided by
54 * Dell Inc. so their systems "just work". :-)
58 * Some machines require the "reboot=b" or "reboot=k" commandline options,
59 * this quirk makes that automatic.
61 static int __init set_bios_reboot(const struct dmi_system_id *d)
63 if (reboot_type != BOOT_BIOS) {
64 reboot_type = BOOT_BIOS;
65 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
71 void __noreturn machine_real_restart(unsigned int type)
76 * Write zero to CMOS register number 0x0f, which the BIOS POST
77 * routine will recognize as telling it to do a proper reboot. (Well
78 * that's what this book in front of me says -- it may only apply to
79 * the Phoenix BIOS though, it's not clear). At the same time,
80 * disable NMIs by setting the top bit in the CMOS address register,
81 * as we're about to do peculiar things to the CPU. I'm not sure if
82 * `outb_p' is needed instead of just `outb'. Use it to be on the
83 * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
86 CMOS_WRITE(0x00, 0x8f);
87 spin_unlock(&rtc_lock);
90 * Switch back to the initial page table.
93 load_cr3(initial_page_table);
95 write_cr3(real_mode_header->trampoline_pgd);
98 /* Jump to the identity-mapped low memory code */
100 asm volatile("jmpl *%0" : :
101 "rm" (real_mode_header->machine_real_restart_asm),
104 asm volatile("ljmpl *%0" : :
105 "m" (real_mode_header->machine_real_restart_asm),
110 #ifdef CONFIG_APM_MODULE
111 EXPORT_SYMBOL(machine_real_restart);
115 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
117 static int __init set_pci_reboot(const struct dmi_system_id *d)
119 if (reboot_type != BOOT_CF9_FORCE) {
120 reboot_type = BOOT_CF9_FORCE;
121 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
127 static int __init set_kbd_reboot(const struct dmi_system_id *d)
129 if (reboot_type != BOOT_KBD) {
130 reboot_type = BOOT_KBD;
131 pr_info("%s series board detected. Selecting %s-method for reboot.\n",
138 * This is a single dmi_table handling all reboot quirks.
140 static struct dmi_system_id __initdata reboot_dmi_table[] = {
143 { /* Handle reboot issue on Acer Aspire one */
144 .callback = set_kbd_reboot,
145 .ident = "Acer Aspire One A110",
147 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
148 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
153 { /* Handle problems with rebooting on Apple MacBook5 */
154 .callback = set_pci_reboot,
155 .ident = "Apple MacBook5",
157 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
158 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
161 { /* Handle problems with rebooting on Apple MacBookPro5 */
162 .callback = set_pci_reboot,
163 .ident = "Apple MacBookPro5",
165 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
166 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
169 { /* Handle problems with rebooting on Apple Macmini3,1 */
170 .callback = set_pci_reboot,
171 .ident = "Apple Macmini3,1",
173 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
174 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
177 { /* Handle problems with rebooting on the iMac9,1. */
178 .callback = set_pci_reboot,
179 .ident = "Apple iMac9,1",
181 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
182 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
187 { /* Handle problems with rebooting on ASUS P4S800 */
188 .callback = set_bios_reboot,
189 .ident = "ASUS P4S800",
191 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
192 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
197 { /* Handle problems with rebooting on Certec BPC600 */
198 .callback = set_pci_reboot,
199 .ident = "Certec BPC600",
201 DMI_MATCH(DMI_SYS_VENDOR, "Certec"),
202 DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"),
207 { /* Handle problems with rebooting on Dell DXP061 */
208 .callback = set_bios_reboot,
209 .ident = "Dell DXP061",
211 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
212 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
215 { /* Handle problems with rebooting on Dell E520's */
216 .callback = set_bios_reboot,
217 .ident = "Dell E520",
219 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
220 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
223 { /* Handle problems with rebooting on the Latitude E5410. */
224 .callback = set_pci_reboot,
225 .ident = "Dell Latitude E5410",
227 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
228 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"),
231 { /* Handle problems with rebooting on the Latitude E5420. */
232 .callback = set_pci_reboot,
233 .ident = "Dell Latitude E5420",
235 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
236 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
239 { /* Handle problems with rebooting on the Latitude E6320. */
240 .callback = set_pci_reboot,
241 .ident = "Dell Latitude E6320",
243 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
244 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
247 { /* Handle problems with rebooting on the Latitude E6420. */
248 .callback = set_pci_reboot,
249 .ident = "Dell Latitude E6420",
251 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
252 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
255 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
256 .callback = set_bios_reboot,
257 .ident = "Dell OptiPlex 330",
259 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
260 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
261 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
264 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
265 .callback = set_bios_reboot,
266 .ident = "Dell OptiPlex 360",
268 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
269 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
270 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
273 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */
274 .callback = set_bios_reboot,
275 .ident = "Dell OptiPlex 745",
277 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
278 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
281 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */
282 .callback = set_bios_reboot,
283 .ident = "Dell OptiPlex 745",
285 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
286 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
287 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
290 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
291 .callback = set_bios_reboot,
292 .ident = "Dell OptiPlex 745",
294 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
295 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
296 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
299 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
300 .callback = set_bios_reboot,
301 .ident = "Dell OptiPlex 760",
303 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
304 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
305 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
308 { /* Handle problems with rebooting on the OptiPlex 990. */
309 .callback = set_pci_reboot,
310 .ident = "Dell OptiPlex 990",
312 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
313 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
316 { /* Handle problems with rebooting on Dell 300's */
317 .callback = set_bios_reboot,
318 .ident = "Dell PowerEdge 300",
320 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
321 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
324 { /* Handle problems with rebooting on Dell 1300's */
325 .callback = set_bios_reboot,
326 .ident = "Dell PowerEdge 1300",
328 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
329 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
332 { /* Handle problems with rebooting on Dell 2400's */
333 .callback = set_bios_reboot,
334 .ident = "Dell PowerEdge 2400",
336 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
337 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
340 { /* Handle problems with rebooting on the Dell PowerEdge C6100. */
341 .callback = set_pci_reboot,
342 .ident = "Dell PowerEdge C6100",
344 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
345 DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
348 { /* Handle problems with rebooting on the Precision M6600. */
349 .callback = set_pci_reboot,
350 .ident = "Dell Precision M6600",
352 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
353 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
356 { /* Handle problems with rebooting on Dell T5400's */
357 .callback = set_bios_reboot,
358 .ident = "Dell Precision T5400",
360 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
361 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
364 { /* Handle problems with rebooting on Dell T7400's */
365 .callback = set_bios_reboot,
366 .ident = "Dell Precision T7400",
368 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
369 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
372 { /* Handle problems with rebooting on Dell XPS710 */
373 .callback = set_bios_reboot,
374 .ident = "Dell XPS710",
376 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
377 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
381 /* Hewlett-Packard */
382 { /* Handle problems with rebooting on HP laptops */
383 .callback = set_bios_reboot,
384 .ident = "HP Compaq Laptop",
386 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
387 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
392 { /* Handle problems with rebooting on Sony VGN-Z540N */
393 .callback = set_bios_reboot,
394 .ident = "Sony VGN-Z540N",
396 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
397 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
404 static int __init reboot_init(void)
409 * Only do the DMI check if reboot_type hasn't been overridden
410 * on the command line
416 * The DMI quirks table takes precedence. If no quirks entry
417 * matches and the ACPI Hardware Reduced bit is set, force EFI
420 rv = dmi_check_system(reboot_dmi_table);
422 if (!rv && efi_reboot_required())
423 reboot_type = BOOT_EFI;
427 core_initcall(reboot_init);
429 static inline void kb_wait(void)
433 for (i = 0; i < 0x10000; i++) {
434 if ((inb(0x64) & 0x02) == 0)
440 static void vmxoff_nmi(int cpu, struct pt_regs *regs)
442 cpu_emergency_vmxoff();
445 /* Use NMIs as IPIs to tell all CPUs to disable virtualization */
446 static void emergency_vmx_disable_all(void)
448 /* Just make sure we won't change CPUs while doing this */
452 * We need to disable VMX on all CPUs before rebooting, otherwise
453 * we risk hanging up the machine, because the CPU ignore INIT
454 * signals when VMX is enabled.
456 * We can't take any locks and we may be on an inconsistent
457 * state, so we use NMIs as IPIs to tell the other CPUs to disable
460 * For safety, we will avoid running the nmi_shootdown_cpus()
461 * stuff unnecessarily, but we don't have a way to check
462 * if other CPUs have VMX enabled. So we will call it only if the
463 * CPU we are running on has VMX enabled.
465 * We will miss cases where VMX is not enabled on all CPUs. This
466 * shouldn't do much harm because KVM always enable VMX on all
467 * CPUs anyway. But we can miss it on the small window where KVM
468 * is still enabling VMX.
470 if (cpu_has_vmx() && cpu_vmx_enabled()) {
471 /* Disable VMX on this CPU. */
474 /* Halt and disable VMX on the other CPUs */
475 nmi_shootdown_cpus(vmxoff_nmi);
481 void __attribute__((weak)) mach_reboot_fixups(void)
486 * To the best of our knowledge Windows compatible x86 hardware expects
487 * the following on reboot:
489 * 1) If the FADT has the ACPI reboot register flag set, try it
490 * 2) If still alive, write to the keyboard controller
491 * 3) If still alive, write to the ACPI reboot register again
492 * 4) If still alive, write to the keyboard controller again
493 * 5) If still alive, call the EFI runtime service to reboot
494 * 6) If no EFI runtime service, call the BIOS to do a reboot
496 * We default to following the same pattern. We also have
497 * two other reboot methods: 'triple fault' and 'PCI', which
498 * can be triggered via the reboot= kernel boot option or
501 * This means that this function can never return, it can misbehave
502 * by not rebooting properly and hanging.
504 static void native_machine_emergency_restart(void)
508 int orig_reboot_type = reboot_type;
511 if (reboot_emergency)
512 emergency_vmx_disable_all();
514 tboot_shutdown(TB_SHUTDOWN_REBOOT);
516 /* Tell the BIOS if we want cold or warm reboot */
517 mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
518 *((unsigned short *)__va(0x472)) = mode;
521 /* Could also try the reset bit in the Hammer NB */
522 switch (reboot_type) {
525 reboot_type = BOOT_KBD;
529 mach_reboot_fixups(); /* For board specific fixups */
531 for (i = 0; i < 10; i++) {
534 outb(0xfe, 0x64); /* Pulse reset low */
537 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
539 reboot_type = BOOT_ACPI;
541 reboot_type = BOOT_EFI;
546 efi_reboot(reboot_mode, NULL);
547 reboot_type = BOOT_BIOS;
551 machine_real_restart(MRR_BIOS);
553 /* We're probably dead after this, but... */
554 reboot_type = BOOT_CF9_SAFE;
558 port_cf9_safe = true;
563 u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E;
564 u8 cf9 = inb(0xcf9) & ~reboot_code;
565 outb(cf9|2, 0xcf9); /* Request hard reset */
567 /* Actually do the reset */
568 outb(cf9|reboot_code, 0xcf9);
571 reboot_type = BOOT_TRIPLE;
576 __asm__ __volatile__("int3");
578 /* We're probably dead after this, but... */
579 reboot_type = BOOT_KBD;
585 void native_machine_shutdown(void)
587 /* Stop the cpus and apics */
588 #ifdef CONFIG_X86_IO_APIC
590 * Disabling IO APIC before local APIC is a workaround for
591 * erratum AVR31 in "Intel Atom Processor C2000 Product Family
592 * Specification Update". In this situation, interrupts that target
593 * a Logical Processor whose Local APIC is either in the process of
594 * being hardware disabled or software disabled are neither delivered
595 * nor discarded. When this erratum occurs, the processor may hang.
597 * Even without the erratum, it still makes sense to quiet IO APIC
598 * before disabling Local APIC.
605 * Stop all of the others. Also disable the local irq to
606 * not receive the per-cpu timer interrupt which may trigger
607 * scheduler's load balance.
615 #ifdef CONFIG_HPET_TIMER
620 x86_platform.iommu_shutdown();
624 static void __machine_emergency_restart(int emergency)
626 reboot_emergency = emergency;
627 machine_ops.emergency_restart();
630 static void native_machine_restart(char *__unused)
632 pr_notice("machine restart\n");
636 __machine_emergency_restart(0);
639 static void native_machine_halt(void)
641 /* Stop other cpus and apics */
644 tboot_shutdown(TB_SHUTDOWN_HALT);
649 static void native_machine_power_off(void)
656 /* A fallback in case there is no PM info available */
657 tboot_shutdown(TB_SHUTDOWN_HALT);
660 struct machine_ops machine_ops = {
661 .power_off = native_machine_power_off,
662 .shutdown = native_machine_shutdown,
663 .emergency_restart = native_machine_emergency_restart,
664 .restart = native_machine_restart,
665 .halt = native_machine_halt,
667 .crash_shutdown = native_machine_crash_shutdown,
671 void machine_power_off(void)
673 machine_ops.power_off();
676 void machine_shutdown(void)
678 machine_ops.shutdown();
681 void machine_emergency_restart(void)
683 __machine_emergency_restart(1);
686 void machine_restart(char *cmd)
688 machine_ops.restart(cmd);
691 void machine_halt(void)
697 void machine_crash_shutdown(struct pt_regs *regs)
699 machine_ops.crash_shutdown(regs);
704 #if defined(CONFIG_SMP)
706 /* This keeps a track of which one is crashing cpu. */
707 static int crashing_cpu;
708 static nmi_shootdown_cb shootdown_callback;
710 static atomic_t waiting_for_crash_ipi;
712 static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
716 cpu = raw_smp_processor_id();
719 * Don't do anything if this handler is invoked on crashing cpu.
720 * Otherwise, system will completely hang. Crashing cpu can get
721 * an NMI if system was initially booted with nmi_watchdog parameter.
723 if (cpu == crashing_cpu)
727 shootdown_callback(cpu, regs);
729 atomic_dec(&waiting_for_crash_ipi);
730 /* Assume hlt works */
738 static void smp_send_nmi_allbutself(void)
740 apic->send_IPI_allbutself(NMI_VECTOR);
744 * Halt all other CPUs, calling the specified function on each of them
746 * This function can be used to halt all other CPUs on crash
747 * or emergency reboot time. The function passed as parameter
748 * will be called inside a NMI handler on all CPUs.
750 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
755 /* Make a note of crashing cpu. Will be used in NMI callback. */
756 crashing_cpu = safe_smp_processor_id();
758 shootdown_callback = callback;
760 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
761 /* Would it be better to replace the trap vector here? */
762 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
763 NMI_FLAG_FIRST, "crash"))
764 return; /* Return what? */
766 * Ensure the new callback function is set before sending
771 smp_send_nmi_allbutself();
773 msecs = 1000; /* Wait at most a second for the other cpus to stop */
774 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
779 /* Leave the nmi callback set */
781 #else /* !CONFIG_SMP */
782 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
784 /* No other CPUs to shoot down */