1 #include <linux/module.h>
2 #include <linux/reboot.h>
3 #include <linux/init.h>
7 #include <linux/sched.h>
8 #include <linux/tboot.h>
9 #include <linux/delay.h>
10 #include <acpi/reboot.h>
15 #include <asm/pgtable.h>
16 #include <asm/proto.h>
17 #include <asm/reboot_fixups.h>
18 #include <asm/reboot.h>
19 #include <asm/pci_x86.h>
20 #include <asm/virtext.h>
25 #include <linux/ctype.h>
26 #include <linux/mc146818rtc.h>
27 #include <asm/realmode.h>
28 #include <asm/x86_init.h>
31 * Power off function, if any
33 void (*pm_power_off)(void);
34 EXPORT_SYMBOL(pm_power_off);
36 static const struct desc_ptr no_idt = {};
37 static int reboot_mode;
38 enum reboot_type reboot_type = BOOT_ACPI;
42 * This variable is used privately to keep track of whether or not
43 * reboot_type is still set to its default value (i.e., reboot= hasn't
44 * been set on the command line). This is needed so that we can
45 * suppress DMI scanning for reboot quirks. Without it, it's
46 * impossible to override a faulty reboot quirk without recompiling.
48 static int reboot_default = 1;
51 static int reboot_cpu = -1;
55 * This is set if we need to go through the 'emergency' path.
56 * When machine_emergency_restart() is called, we may be on
57 * an inconsistent state and won't be able to do a clean cleanup
59 static int reboot_emergency;
61 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */
62 bool port_cf9_safe = false;
65 * reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
66 * warm Don't set the cold reboot flag
67 * cold Set the cold reboot flag
68 * bios Reboot by jumping through the BIOS
69 * smp Reboot by executing reset on BSP or other CPU
70 * triple Force a triple fault (init)
71 * kbd Use the keyboard controller. cold reset (default)
72 * acpi Use the RESET_REG in the FADT
73 * efi Use efi reset_system runtime service
74 * pci Use the so-called "PCI reset register", CF9
75 * force Avoid anything that could hang.
77 static int __init reboot_setup(char *str)
81 * Having anything passed on the command line via
82 * reboot= will cause us to disable DMI checking
98 if (isdigit(*(str+1))) {
99 reboot_cpu = (int) (*(str+1) - '0');
100 if (isdigit(*(str+2)))
101 reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0');
104 * We will leave sorting out the final value
105 * when we are ready to reboot, since we might not
106 * have detected BSP APIC ID or smp_num_cpu
109 #endif /* CONFIG_SMP */
125 str = strchr(str, ',');
134 __setup("reboot=", reboot_setup);
138 * Reboot options and system auto-detection code provided by
139 * Dell Inc. so their systems "just work". :-)
143 * Some machines require the "reboot=b" or "reboot=k" commandline options,
144 * this quirk makes that automatic.
146 static int __init set_bios_reboot(const struct dmi_system_id *d)
148 if (reboot_type != BOOT_BIOS) {
149 reboot_type = BOOT_BIOS;
150 printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident);
155 void __noreturn machine_real_restart(unsigned int type)
160 * Write zero to CMOS register number 0x0f, which the BIOS POST
161 * routine will recognize as telling it to do a proper reboot. (Well
162 * that's what this book in front of me says -- it may only apply to
163 * the Phoenix BIOS though, it's not clear). At the same time,
164 * disable NMIs by setting the top bit in the CMOS address register,
165 * as we're about to do peculiar things to the CPU. I'm not sure if
166 * `outb_p' is needed instead of just `outb'. Use it to be on the
167 * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
169 spin_lock(&rtc_lock);
170 CMOS_WRITE(0x00, 0x8f);
171 spin_unlock(&rtc_lock);
174 * Switch back to the initial page table.
177 load_cr3(initial_page_table);
179 write_cr3(real_mode_header->trampoline_pgd);
183 * Write 0x1234 to absolute memory location 0x472. The BIOS reads
184 * this on booting to tell it to "Bypass memory test (also warm
185 * boot)". This seems like a fairly standard thing that gets set by
186 * REBOOT.COM programs, and the previous reset routine did this
188 *((unsigned short *)0x472) = reboot_mode;
190 /* Jump to the identity-mapped low memory code */
192 asm volatile("jmpl *%0" : :
193 "rm" (real_mode_header->machine_real_restart_asm),
196 asm volatile("ljmpl *%0" : :
197 "m" (real_mode_header->machine_real_restart_asm),
202 #ifdef CONFIG_APM_MODULE
203 EXPORT_SYMBOL(machine_real_restart);
207 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
209 static int __init set_pci_reboot(const struct dmi_system_id *d)
211 if (reboot_type != BOOT_CF9) {
212 reboot_type = BOOT_CF9;
213 printk(KERN_INFO "%s series board detected. "
214 "Selecting PCI-method for reboots.\n", d->ident);
219 static int __init set_kbd_reboot(const struct dmi_system_id *d)
221 if (reboot_type != BOOT_KBD) {
222 reboot_type = BOOT_KBD;
223 printk(KERN_INFO "%s series board detected. Selecting KBD-method for reboot.\n", d->ident);
229 * This is a single dmi_table handling all reboot quirks.
231 static struct dmi_system_id __initdata reboot_dmi_table[] = {
232 { /* Handle problems with rebooting on Dell E520's */
233 .callback = set_bios_reboot,
234 .ident = "Dell E520",
236 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
237 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
240 { /* Handle problems with rebooting on Dell 1300's */
241 .callback = set_bios_reboot,
242 .ident = "Dell PowerEdge 1300",
244 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
245 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
248 { /* Handle problems with rebooting on Dell 300's */
249 .callback = set_bios_reboot,
250 .ident = "Dell PowerEdge 300",
252 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
253 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
256 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */
257 .callback = set_bios_reboot,
258 .ident = "Dell OptiPlex 745",
260 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
261 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
264 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */
265 .callback = set_bios_reboot,
266 .ident = "Dell OptiPlex 745",
268 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
269 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
270 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
273 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
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"),
279 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
282 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
283 .callback = set_bios_reboot,
284 .ident = "Dell OptiPlex 330",
286 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
287 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
288 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
291 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
292 .callback = set_bios_reboot,
293 .ident = "Dell OptiPlex 360",
295 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
296 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
297 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
300 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
301 .callback = set_bios_reboot,
302 .ident = "Dell OptiPlex 760",
304 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
305 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
306 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
309 { /* Handle problems with rebooting on Dell 2400's */
310 .callback = set_bios_reboot,
311 .ident = "Dell PowerEdge 2400",
313 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
314 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
317 { /* Handle problems with rebooting on Dell T5400's */
318 .callback = set_bios_reboot,
319 .ident = "Dell Precision T5400",
321 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
322 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
325 { /* Handle problems with rebooting on Dell T7400's */
326 .callback = set_bios_reboot,
327 .ident = "Dell Precision T7400",
329 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
330 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
333 { /* Handle problems with rebooting on HP laptops */
334 .callback = set_bios_reboot,
335 .ident = "HP Compaq Laptop",
337 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
338 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
341 { /* Handle problems with rebooting on Dell XPS710 */
342 .callback = set_bios_reboot,
343 .ident = "Dell XPS710",
345 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
346 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
349 { /* Handle problems with rebooting on Dell DXP061 */
350 .callback = set_bios_reboot,
351 .ident = "Dell DXP061",
353 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
354 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
357 { /* Handle problems with rebooting on Sony VGN-Z540N */
358 .callback = set_bios_reboot,
359 .ident = "Sony VGN-Z540N",
361 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
362 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
365 { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */
366 .callback = set_bios_reboot,
367 .ident = "CompuLab SBC-FITPC2",
369 DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"),
370 DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"),
373 { /* Handle problems with rebooting on ASUS P4S800 */
374 .callback = set_bios_reboot,
375 .ident = "ASUS P4S800",
377 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
378 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
382 { /* Handle reboot issue on Acer Aspire one */
383 .callback = set_kbd_reboot,
384 .ident = "Acer Aspire One A110",
386 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
387 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
390 { /* Handle problems with rebooting on Apple MacBook5 */
391 .callback = set_pci_reboot,
392 .ident = "Apple MacBook5",
394 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
395 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
398 { /* Handle problems with rebooting on Apple MacBookPro5 */
399 .callback = set_pci_reboot,
400 .ident = "Apple MacBookPro5",
402 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
403 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
406 { /* Handle problems with rebooting on Apple Macmini3,1 */
407 .callback = set_pci_reboot,
408 .ident = "Apple Macmini3,1",
410 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
411 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
414 { /* Handle problems with rebooting on the iMac9,1. */
415 .callback = set_pci_reboot,
416 .ident = "Apple iMac9,1",
418 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
419 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
422 { /* Handle problems with rebooting on the Latitude E6320. */
423 .callback = set_pci_reboot,
424 .ident = "Dell Latitude E6320",
426 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
427 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
430 { /* Handle problems with rebooting on the Latitude E5420. */
431 .callback = set_pci_reboot,
432 .ident = "Dell Latitude E5420",
434 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
435 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
438 { /* Handle problems with rebooting on the Latitude E6420. */
439 .callback = set_pci_reboot,
440 .ident = "Dell Latitude E6420",
442 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
443 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
446 { /* Handle problems with rebooting on the OptiPlex 990. */
447 .callback = set_pci_reboot,
448 .ident = "Dell OptiPlex 990",
450 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
451 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
457 static int __init reboot_init(void)
460 * Only do the DMI check if reboot_type hasn't been overridden
461 * on the command line
464 dmi_check_system(reboot_dmi_table);
467 core_initcall(reboot_init);
469 static inline void kb_wait(void)
473 for (i = 0; i < 0x10000; i++) {
474 if ((inb(0x64) & 0x02) == 0)
480 static void vmxoff_nmi(int cpu, struct pt_regs *regs)
482 cpu_emergency_vmxoff();
485 /* Use NMIs as IPIs to tell all CPUs to disable virtualization */
486 static void emergency_vmx_disable_all(void)
488 /* Just make sure we won't change CPUs while doing this */
492 * We need to disable VMX on all CPUs before rebooting, otherwise
493 * we risk hanging up the machine, because the CPU ignore INIT
494 * signals when VMX is enabled.
496 * We can't take any locks and we may be on an inconsistent
497 * state, so we use NMIs as IPIs to tell the other CPUs to disable
500 * For safety, we will avoid running the nmi_shootdown_cpus()
501 * stuff unnecessarily, but we don't have a way to check
502 * if other CPUs have VMX enabled. So we will call it only if the
503 * CPU we are running on has VMX enabled.
505 * We will miss cases where VMX is not enabled on all CPUs. This
506 * shouldn't do much harm because KVM always enable VMX on all
507 * CPUs anyway. But we can miss it on the small window where KVM
508 * is still enabling VMX.
510 if (cpu_has_vmx() && cpu_vmx_enabled()) {
511 /* Disable VMX on this CPU. */
514 /* Halt and disable VMX on the other CPUs */
515 nmi_shootdown_cpus(vmxoff_nmi);
521 void __attribute__((weak)) mach_reboot_fixups(void)
526 * Windows compatible x86 hardware expects the following on reboot:
528 * 1) If the FADT has the ACPI reboot register flag set, try it
529 * 2) If still alive, write to the keyboard controller
530 * 3) If still alive, write to the ACPI reboot register again
531 * 4) If still alive, write to the keyboard controller again
533 * If the machine is still alive at this stage, it gives up. We default to
534 * following the same pattern, except that if we're still alive after (4) we'll
535 * try to force a triple fault and then cycle between hitting the keyboard
536 * controller and doing that
538 static void native_machine_emergency_restart(void)
542 int orig_reboot_type = reboot_type;
544 if (reboot_emergency)
545 emergency_vmx_disable_all();
547 tboot_shutdown(TB_SHUTDOWN_REBOOT);
549 /* Tell the BIOS if we want cold or warm reboot */
550 *((unsigned short *)__va(0x472)) = reboot_mode;
553 /* Could also try the reset bit in the Hammer NB */
554 switch (reboot_type) {
556 mach_reboot_fixups(); /* For board specific fixups */
558 for (i = 0; i < 10; i++) {
561 outb(0xfe, 0x64); /* Pulse reset low */
564 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
566 reboot_type = BOOT_ACPI;
568 reboot_type = BOOT_TRIPLE;
574 __asm__ __volatile__("int3");
576 reboot_type = BOOT_KBD;
580 machine_real_restart(MRR_BIOS);
582 reboot_type = BOOT_KBD;
587 reboot_type = BOOT_KBD;
592 efi.reset_system(reboot_mode ?
595 EFI_SUCCESS, 0, NULL);
596 reboot_type = BOOT_KBD;
600 port_cf9_safe = true;
605 u8 cf9 = inb(0xcf9) & ~6;
606 outb(cf9|2, 0xcf9); /* Request hard reset */
608 outb(cf9|6, 0xcf9); /* Actually do the reset */
611 reboot_type = BOOT_KBD;
617 void native_machine_shutdown(void)
619 /* Stop the cpus and apics */
622 /* The boot cpu is always logical cpu 0 */
623 int reboot_cpu_id = 0;
625 /* See if there has been given a command line override */
626 if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
627 cpu_online(reboot_cpu))
628 reboot_cpu_id = reboot_cpu;
630 /* Make certain the cpu I'm about to reboot on is online */
631 if (!cpu_online(reboot_cpu_id))
632 reboot_cpu_id = smp_processor_id();
634 /* Make certain I only run on the appropriate processor */
635 set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
638 * O.K Now that I'm on the appropriate processor, stop all of the
639 * others. Also disable the local irq to not receive the per-cpu
640 * timer interrupt which may trigger scheduler's load balance.
648 #ifdef CONFIG_X86_IO_APIC
652 #ifdef CONFIG_HPET_TIMER
657 x86_platform.iommu_shutdown();
661 static void __machine_emergency_restart(int emergency)
663 reboot_emergency = emergency;
664 machine_ops.emergency_restart();
667 static void native_machine_restart(char *__unused)
669 printk("machine restart\n");
673 __machine_emergency_restart(0);
676 static void native_machine_halt(void)
678 /* Stop other cpus and apics */
681 tboot_shutdown(TB_SHUTDOWN_HALT);
686 static void native_machine_power_off(void)
693 /* A fallback in case there is no PM info available */
694 tboot_shutdown(TB_SHUTDOWN_HALT);
697 struct machine_ops machine_ops = {
698 .power_off = native_machine_power_off,
699 .shutdown = native_machine_shutdown,
700 .emergency_restart = native_machine_emergency_restart,
701 .restart = native_machine_restart,
702 .halt = native_machine_halt,
704 .crash_shutdown = native_machine_crash_shutdown,
708 void machine_power_off(void)
710 machine_ops.power_off();
713 void machine_shutdown(void)
715 machine_ops.shutdown();
718 void machine_emergency_restart(void)
720 __machine_emergency_restart(1);
723 void machine_restart(char *cmd)
725 machine_ops.restart(cmd);
728 void machine_halt(void)
734 void machine_crash_shutdown(struct pt_regs *regs)
736 machine_ops.crash_shutdown(regs);
741 #if defined(CONFIG_SMP)
743 /* This keeps a track of which one is crashing cpu. */
744 static int crashing_cpu;
745 static nmi_shootdown_cb shootdown_callback;
747 static atomic_t waiting_for_crash_ipi;
749 static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
753 cpu = raw_smp_processor_id();
756 * Don't do anything if this handler is invoked on crashing cpu.
757 * Otherwise, system will completely hang. Crashing cpu can get
758 * an NMI if system was initially booted with nmi_watchdog parameter.
760 if (cpu == crashing_cpu)
764 shootdown_callback(cpu, regs);
766 atomic_dec(&waiting_for_crash_ipi);
767 /* Assume hlt works */
775 static void smp_send_nmi_allbutself(void)
777 apic->send_IPI_allbutself(NMI_VECTOR);
781 * Halt all other CPUs, calling the specified function on each of them
783 * This function can be used to halt all other CPUs on crash
784 * or emergency reboot time. The function passed as parameter
785 * will be called inside a NMI handler on all CPUs.
787 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
792 /* Make a note of crashing cpu. Will be used in NMI callback. */
793 crashing_cpu = safe_smp_processor_id();
795 shootdown_callback = callback;
797 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
798 /* Would it be better to replace the trap vector here? */
799 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
800 NMI_FLAG_FIRST, "crash"))
801 return; /* Return what? */
803 * Ensure the new callback function is set before sending
808 smp_send_nmi_allbutself();
810 msecs = 1000; /* Wait at most a second for the other cpus to stop */
811 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
816 /* Leave the nmi callback set */
818 #else /* !CONFIG_SMP */
819 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
821 /* No other CPUs to shoot down */