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>
29 # 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 = {};
39 static int reboot_mode;
40 enum reboot_type reboot_type = BOOT_ACPI;
43 /* This variable is used privately to keep track of whether or not
44 * reboot_type is still set to its default value (i.e., reboot= hasn't
45 * been set on the command line). This is needed so that we can
46 * suppress DMI scanning for reboot quirks. Without it, it's
47 * impossible to override a faulty reboot quirk without recompiling.
49 static int reboot_default = 1;
51 #if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
52 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;
64 /* reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
65 warm Don't set the cold reboot flag
66 cold Set the cold reboot flag
67 bios Reboot by jumping through the BIOS (only for X86_32)
68 smp Reboot by executing reset on BSP or other CPU (only for X86_32)
69 triple Force a triple fault (init)
70 kbd Use the keyboard controller. cold reset (default)
71 acpi Use the RESET_REG in the FADT
72 efi Use efi reset_system runtime service
73 pci Use the so-called "PCI reset register", CF9
74 force Avoid anything that could hang.
76 static int __init reboot_setup(char *str)
79 /* Having anything passed on the command line via
80 * reboot= will cause us to disable DMI checking
97 if (isdigit(*(str+1))) {
98 reboot_cpu = (int) (*(str+1) - '0');
99 if (isdigit(*(str+2)))
100 reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0');
102 /* we will leave sorting out the final value
103 when we are ready to reboot, since we might not
104 have detected BSP APIC ID or smp_num_cpu */
106 #endif /* CONFIG_SMP */
123 str = strchr(str, ',');
132 __setup("reboot=", reboot_setup);
137 * Reboot options and system auto-detection code provided by
138 * Dell Inc. so their systems "just work". :-)
142 * Some machines require the "reboot=b" or "reboot=k" commandline options,
143 * this quirk makes that automatic.
145 static int __init set_bios_reboot(const struct dmi_system_id *d)
147 if (reboot_type != BOOT_BIOS) {
148 reboot_type = BOOT_BIOS;
149 printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident);
154 static int __init set_kbd_reboot(const struct dmi_system_id *d)
156 if (reboot_type != BOOT_KBD) {
157 reboot_type = BOOT_KBD;
158 printk(KERN_INFO "%s series board detected. Selecting KBD-method for reboot.\n", d->ident);
163 static struct dmi_system_id __initdata reboot_dmi_table[] = {
164 { /* Handle problems with rebooting on Dell E520's */
165 .callback = set_bios_reboot,
166 .ident = "Dell E520",
168 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
169 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
172 { /* Handle problems with rebooting on Dell 1300's */
173 .callback = set_bios_reboot,
174 .ident = "Dell PowerEdge 1300",
176 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
177 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
180 { /* Handle problems with rebooting on Dell 300's */
181 .callback = set_bios_reboot,
182 .ident = "Dell PowerEdge 300",
184 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
185 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
188 { /* Handle problems with rebooting on Dell Optiplex 745's SFF*/
189 .callback = set_bios_reboot,
190 .ident = "Dell OptiPlex 745",
192 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
193 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
196 { /* Handle problems with rebooting on Dell Optiplex 745's DFF*/
197 .callback = set_bios_reboot,
198 .ident = "Dell OptiPlex 745",
200 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
201 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
202 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
205 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
206 .callback = set_bios_reboot,
207 .ident = "Dell OptiPlex 745",
209 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
210 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
211 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
214 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
215 .callback = set_bios_reboot,
216 .ident = "Dell OptiPlex 330",
218 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
219 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
220 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
223 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
224 .callback = set_bios_reboot,
225 .ident = "Dell OptiPlex 360",
227 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
228 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
229 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
232 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G*/
233 .callback = set_bios_reboot,
234 .ident = "Dell OptiPlex 760",
236 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
237 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
238 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
241 { /* Handle problems with rebooting on Dell 2400's */
242 .callback = set_bios_reboot,
243 .ident = "Dell PowerEdge 2400",
245 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
246 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
249 { /* Handle problems with rebooting on Dell T5400's */
250 .callback = set_bios_reboot,
251 .ident = "Dell Precision T5400",
253 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
254 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
257 { /* Handle problems with rebooting on Dell T7400's */
258 .callback = set_bios_reboot,
259 .ident = "Dell Precision T7400",
261 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
262 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
265 { /* Handle problems with rebooting on HP laptops */
266 .callback = set_bios_reboot,
267 .ident = "HP Compaq Laptop",
269 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
270 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
273 { /* Handle problems with rebooting on Dell XPS710 */
274 .callback = set_bios_reboot,
275 .ident = "Dell XPS710",
277 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
278 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
281 { /* Handle problems with rebooting on Dell DXP061 */
282 .callback = set_bios_reboot,
283 .ident = "Dell DXP061",
285 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
286 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
289 { /* Handle problems with rebooting on Sony VGN-Z540N */
290 .callback = set_bios_reboot,
291 .ident = "Sony VGN-Z540N",
293 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
294 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
297 { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */
298 .callback = set_bios_reboot,
299 .ident = "CompuLab SBC-FITPC2",
301 DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"),
302 DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"),
305 { /* Handle problems with rebooting on ASUS P4S800 */
306 .callback = set_bios_reboot,
307 .ident = "ASUS P4S800",
309 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
310 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
313 { /* Handle reboot issue on Acer Aspire one */
314 .callback = set_kbd_reboot,
315 .ident = "Acer Aspire One A110",
317 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
318 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
324 static int __init reboot_init(void)
326 /* Only do the DMI check if reboot_type hasn't been overridden
327 * on the command line
329 if (reboot_default) {
330 dmi_check_system(reboot_dmi_table);
334 core_initcall(reboot_init);
336 void machine_real_restart(unsigned int type)
338 void (*restart_lowmem)(unsigned int) = (void (*)(unsigned int))
339 real_mode_header->machine_real_restart_asm;
343 /* Write zero to CMOS register number 0x0f, which the BIOS POST
344 routine will recognize as telling it to do a proper reboot. (Well
345 that's what this book in front of me says -- it may only apply to
346 the Phoenix BIOS though, it's not clear). At the same time,
347 disable NMIs by setting the top bit in the CMOS address register,
348 as we're about to do peculiar things to the CPU. I'm not sure if
349 `outb_p' is needed instead of just `outb'. Use it to be on the
350 safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
352 spin_lock(&rtc_lock);
353 CMOS_WRITE(0x00, 0x8f);
354 spin_unlock(&rtc_lock);
357 * Switch back to the initial page table.
359 load_cr3(initial_page_table);
361 /* Write 0x1234 to absolute memory location 0x472. The BIOS reads
362 this on booting to tell it to "Bypass memory test (also warm
363 boot)". This seems like a fairly standard thing that gets set by
364 REBOOT.COM programs, and the previous reset routine did this
366 *((unsigned short *)0x472) = reboot_mode;
368 /* Jump to the identity-mapped low memory code */
369 restart_lowmem(type);
371 #ifdef CONFIG_APM_MODULE
372 EXPORT_SYMBOL(machine_real_restart);
375 #endif /* CONFIG_X86_32 */
378 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
380 static int __init set_pci_reboot(const struct dmi_system_id *d)
382 if (reboot_type != BOOT_CF9) {
383 reboot_type = BOOT_CF9;
384 printk(KERN_INFO "%s series board detected. "
385 "Selecting PCI-method for reboots.\n", d->ident);
390 static struct dmi_system_id __initdata pci_reboot_dmi_table[] = {
391 { /* Handle problems with rebooting on Apple MacBook5 */
392 .callback = set_pci_reboot,
393 .ident = "Apple MacBook5",
395 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
396 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
399 { /* Handle problems with rebooting on Apple MacBookPro5 */
400 .callback = set_pci_reboot,
401 .ident = "Apple MacBookPro5",
403 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
404 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
407 { /* Handle problems with rebooting on Apple Macmini3,1 */
408 .callback = set_pci_reboot,
409 .ident = "Apple Macmini3,1",
411 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
412 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
415 { /* Handle problems with rebooting on the iMac9,1. */
416 .callback = set_pci_reboot,
417 .ident = "Apple iMac9,1",
419 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
420 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
423 { /* Handle problems with rebooting on the Latitude E6320. */
424 .callback = set_pci_reboot,
425 .ident = "Dell Latitude E6320",
427 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
428 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
431 { /* Handle problems with rebooting on the Latitude E5420. */
432 .callback = set_pci_reboot,
433 .ident = "Dell Latitude E5420",
435 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
436 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
439 { /* Handle problems with rebooting on the Latitude E6420. */
440 .callback = set_pci_reboot,
441 .ident = "Dell Latitude E6420",
443 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
444 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
447 { /* Handle problems with rebooting on the OptiPlex 990. */
448 .callback = set_pci_reboot,
449 .ident = "Dell OptiPlex 990",
451 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
452 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
458 static int __init pci_reboot_init(void)
460 /* Only do the DMI check if reboot_type hasn't been overridden
461 * on the command line
463 if (reboot_default) {
464 dmi_check_system(pci_reboot_dmi_table);
468 core_initcall(pci_reboot_init);
470 static inline void kb_wait(void)
474 for (i = 0; i < 0x10000; i++) {
475 if ((inb(0x64) & 0x02) == 0)
481 static void vmxoff_nmi(int cpu, struct pt_regs *regs)
483 cpu_emergency_vmxoff();
486 /* Use NMIs as IPIs to tell all CPUs to disable virtualization
488 static void emergency_vmx_disable_all(void)
490 /* Just make sure we won't change CPUs while doing this */
493 /* We need to disable VMX on all CPUs before rebooting, otherwise
494 * we risk hanging up the machine, because the CPU ignore INIT
495 * signals when VMX is enabled.
497 * We can't take any locks and we may be on an inconsistent
498 * state, so we use NMIs as IPIs to tell the other CPUs to disable
501 * For safety, we will avoid running the nmi_shootdown_cpus()
502 * stuff unnecessarily, but we don't have a way to check
503 * if other CPUs have VMX enabled. So we will call it only if the
504 * CPU we are running on has VMX enabled.
506 * We will miss cases where VMX is not enabled on all CPUs. This
507 * shouldn't do much harm because KVM always enable VMX on all
508 * CPUs anyway. But we can miss it on the small window where KVM
509 * is still enabling VMX.
511 if (cpu_has_vmx() && cpu_vmx_enabled()) {
512 /* Disable VMX on this CPU.
516 /* Halt and disable VMX on the other CPUs */
517 nmi_shootdown_cpus(vmxoff_nmi);
523 void __attribute__((weak)) mach_reboot_fixups(void)
528 * Windows compatible x86 hardware expects the following on reboot:
530 * 1) If the FADT has the ACPI reboot register flag set, try it
531 * 2) If still alive, write to the keyboard controller
532 * 3) If still alive, write to the ACPI reboot register again
533 * 4) If still alive, write to the keyboard controller again
535 * If the machine is still alive at this stage, it gives up. We default to
536 * following the same pattern, except that if we're still alive after (4) we'll
537 * try to force a triple fault and then cycle between hitting the keyboard
538 * controller and doing that
540 static void native_machine_emergency_restart(void)
544 int orig_reboot_type = reboot_type;
546 if (reboot_emergency)
547 emergency_vmx_disable_all();
549 tboot_shutdown(TB_SHUTDOWN_REBOOT);
551 /* Tell the BIOS if we want cold or warm reboot */
552 *((unsigned short *)__va(0x472)) = reboot_mode;
555 /* Could also try the reset bit in the Hammer NB */
556 switch (reboot_type) {
558 mach_reboot_fixups(); /* for board specific fixups */
560 for (i = 0; i < 10; i++) {
563 outb(0xfe, 0x64); /* pulse reset low */
566 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
568 reboot_type = BOOT_ACPI;
570 reboot_type = BOOT_TRIPLE;
576 __asm__ __volatile__("int3");
578 reboot_type = BOOT_KBD;
583 machine_real_restart(MRR_BIOS);
585 reboot_type = BOOT_KBD;
591 reboot_type = BOOT_KBD;
596 efi.reset_system(reboot_mode ?
599 EFI_SUCCESS, 0, NULL);
600 reboot_type = BOOT_KBD;
604 port_cf9_safe = true;
609 u8 cf9 = inb(0xcf9) & ~6;
610 outb(cf9|2, 0xcf9); /* Request hard reset */
612 outb(cf9|6, 0xcf9); /* Actually do the reset */
615 reboot_type = BOOT_KBD;
621 void native_machine_shutdown(void)
623 /* Stop the cpus and apics */
626 /* The boot cpu is always logical cpu 0 */
627 int reboot_cpu_id = 0;
630 /* See if there has been given a command line override */
631 if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
632 cpu_online(reboot_cpu))
633 reboot_cpu_id = reboot_cpu;
636 /* Make certain the cpu I'm about to reboot on is online */
637 if (!cpu_online(reboot_cpu_id))
638 reboot_cpu_id = smp_processor_id();
640 /* Make certain I only run on the appropriate processor */
641 set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
643 /* O.K Now that I'm on the appropriate processor,
644 * stop all of the others.
651 #ifdef CONFIG_X86_IO_APIC
655 #ifdef CONFIG_HPET_TIMER
660 x86_platform.iommu_shutdown();
664 static void __machine_emergency_restart(int emergency)
666 reboot_emergency = emergency;
667 machine_ops.emergency_restart();
670 static void native_machine_restart(char *__unused)
672 printk("machine restart\n");
676 __machine_emergency_restart(0);
679 static void native_machine_halt(void)
681 /* stop other cpus and apics */
684 tboot_shutdown(TB_SHUTDOWN_HALT);
690 static void native_machine_power_off(void)
697 /* a fallback in case there is no PM info available */
698 tboot_shutdown(TB_SHUTDOWN_HALT);
701 struct machine_ops machine_ops = {
702 .power_off = native_machine_power_off,
703 .shutdown = native_machine_shutdown,
704 .emergency_restart = native_machine_emergency_restart,
705 .restart = native_machine_restart,
706 .halt = native_machine_halt,
708 .crash_shutdown = native_machine_crash_shutdown,
712 void machine_power_off(void)
714 machine_ops.power_off();
717 void machine_shutdown(void)
719 machine_ops.shutdown();
722 void machine_emergency_restart(void)
724 __machine_emergency_restart(1);
727 void machine_restart(char *cmd)
729 machine_ops.restart(cmd);
732 void machine_halt(void)
738 void machine_crash_shutdown(struct pt_regs *regs)
740 machine_ops.crash_shutdown(regs);
745 #if defined(CONFIG_SMP)
747 /* This keeps a track of which one is crashing cpu. */
748 static int crashing_cpu;
749 static nmi_shootdown_cb shootdown_callback;
751 static atomic_t waiting_for_crash_ipi;
753 static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
757 cpu = raw_smp_processor_id();
759 /* Don't do anything if this handler is invoked on crashing cpu.
760 * Otherwise, system will completely hang. Crashing cpu can get
761 * an NMI if system was initially booted with nmi_watchdog parameter.
763 if (cpu == crashing_cpu)
767 shootdown_callback(cpu, regs);
769 atomic_dec(&waiting_for_crash_ipi);
770 /* Assume hlt works */
778 static void smp_send_nmi_allbutself(void)
780 apic->send_IPI_allbutself(NMI_VECTOR);
783 /* Halt all other CPUs, calling the specified function on each of them
785 * This function can be used to halt all other CPUs on crash
786 * or emergency reboot time. The function passed as parameter
787 * will be called inside a NMI handler on all CPUs.
789 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
794 /* Make a note of crashing cpu. Will be used in NMI callback.*/
795 crashing_cpu = safe_smp_processor_id();
797 shootdown_callback = callback;
799 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
800 /* Would it be better to replace the trap vector here? */
801 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
802 NMI_FLAG_FIRST, "crash"))
803 return; /* return what? */
804 /* Ensure the new callback function is set before sending
809 smp_send_nmi_allbutself();
811 msecs = 1000; /* Wait at most a second for the other cpus to stop */
812 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
817 /* Leave the nmi callback set */
819 #else /* !CONFIG_SMP */
820 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
822 /* No other CPUs to shoot down */