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;
44 * This variable is used privately to keep track of whether or not
45 * reboot_type is still set to its default value (i.e., reboot= hasn't
46 * been set on the command line). This is needed so that we can
47 * suppress DMI scanning for reboot quirks. Without it, it's
48 * impossible to override a faulty reboot quirk without recompiling.
50 static int reboot_default = 1;
52 #if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
53 static int reboot_cpu = -1;
57 * This is set if we need to go through the 'emergency' path.
58 * When machine_emergency_restart() is called, we may be on
59 * an inconsistent state and won't be able to do a clean cleanup
61 static int reboot_emergency;
63 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */
64 bool port_cf9_safe = false;
67 * reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
68 * warm Don't set the cold reboot flag
69 * cold Set the cold reboot flag
70 * bios Reboot by jumping through the BIOS (only for X86_32)
71 * smp Reboot by executing reset on BSP or other CPU (only for X86_32)
72 * triple Force a triple fault (init)
73 * kbd Use the keyboard controller. cold reset (default)
74 * acpi Use the RESET_REG in the FADT
75 * efi Use efi reset_system runtime service
76 * pci Use the so-called "PCI reset register", CF9
77 * force Avoid anything that could hang.
79 static int __init reboot_setup(char *str)
83 * Having anything passed on the command line via
84 * reboot= will cause us to disable DMI checking
101 if (isdigit(*(str+1))) {
102 reboot_cpu = (int) (*(str+1) - '0');
103 if (isdigit(*(str+2)))
104 reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0');
107 * We will leave sorting out the final value
108 * when we are ready to reboot, since we might not
109 * have detected BSP APIC ID or smp_num_cpu
112 #endif /* CONFIG_SMP */
129 str = strchr(str, ',');
138 __setup("reboot=", reboot_setup);
143 * Reboot options and system auto-detection code provided by
144 * Dell Inc. so their systems "just work". :-)
148 * Some machines require the "reboot=b" or "reboot=k" commandline options,
149 * this quirk makes that automatic.
151 static int __init set_bios_reboot(const struct dmi_system_id *d)
153 if (reboot_type != BOOT_BIOS) {
154 reboot_type = BOOT_BIOS;
155 printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident);
160 void machine_real_restart(unsigned int type)
162 void (*restart_lowmem)(unsigned int) = (void (*)(unsigned int))
163 real_mode_header->machine_real_restart_asm;
168 * Write zero to CMOS register number 0x0f, which the BIOS POST
169 * routine will recognize as telling it to do a proper reboot. (Well
170 * that's what this book in front of me says -- it may only apply to
171 * the Phoenix BIOS though, it's not clear). At the same time,
172 * disable NMIs by setting the top bit in the CMOS address register,
173 * as we're about to do peculiar things to the CPU. I'm not sure if
174 * `outb_p' is needed instead of just `outb'. Use it to be on the
175 * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
177 spin_lock(&rtc_lock);
178 CMOS_WRITE(0x00, 0x8f);
179 spin_unlock(&rtc_lock);
182 * Switch back to the initial page table.
184 load_cr3(initial_page_table);
187 * Write 0x1234 to absolute memory location 0x472. The BIOS reads
188 * this on booting to tell it to "Bypass memory test (also warm
189 * boot)". This seems like a fairly standard thing that gets set by
190 * REBOOT.COM programs, and the previous reset routine did this
192 *((unsigned short *)0x472) = reboot_mode;
194 /* Jump to the identity-mapped low memory code */
195 restart_lowmem(type);
197 #ifdef CONFIG_APM_MODULE
198 EXPORT_SYMBOL(machine_real_restart);
201 #endif /* CONFIG_X86_32 */
204 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
206 static int __init set_pci_reboot(const struct dmi_system_id *d)
208 if (reboot_type != BOOT_CF9) {
209 reboot_type = BOOT_CF9;
210 printk(KERN_INFO "%s series board detected. "
211 "Selecting PCI-method for reboots.\n", d->ident);
216 static int __init set_kbd_reboot(const struct dmi_system_id *d)
218 if (reboot_type != BOOT_KBD) {
219 reboot_type = BOOT_KBD;
220 printk(KERN_INFO "%s series board detected. Selecting KBD-method for reboot.\n", d->ident);
226 * This is a single dmi_table handling all reboot quirks. Note that
227 * REBOOT_BIOS is only available for 32bit
229 static struct dmi_system_id __initdata reboot_dmi_table[] = {
231 { /* Handle problems with rebooting on Dell E520's */
232 .callback = set_bios_reboot,
233 .ident = "Dell E520",
235 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
236 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
239 { /* Handle problems with rebooting on Dell 1300's */
240 .callback = set_bios_reboot,
241 .ident = "Dell PowerEdge 1300",
243 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
244 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
247 { /* Handle problems with rebooting on Dell 300's */
248 .callback = set_bios_reboot,
249 .ident = "Dell PowerEdge 300",
251 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
252 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
255 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */
256 .callback = set_bios_reboot,
257 .ident = "Dell OptiPlex 745",
259 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
260 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
263 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */
264 .callback = set_bios_reboot,
265 .ident = "Dell OptiPlex 745",
267 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
268 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
269 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
272 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
273 .callback = set_bios_reboot,
274 .ident = "Dell OptiPlex 745",
276 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
277 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
278 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
281 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
282 .callback = set_bios_reboot,
283 .ident = "Dell OptiPlex 330",
285 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
286 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
287 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
290 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
291 .callback = set_bios_reboot,
292 .ident = "Dell OptiPlex 360",
294 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
295 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
296 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
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 Dell 2400's */
309 .callback = set_bios_reboot,
310 .ident = "Dell PowerEdge 2400",
312 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
313 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
316 { /* Handle problems with rebooting on Dell T5400's */
317 .callback = set_bios_reboot,
318 .ident = "Dell Precision T5400",
320 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
321 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
324 { /* Handle problems with rebooting on Dell T7400's */
325 .callback = set_bios_reboot,
326 .ident = "Dell Precision T7400",
328 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
329 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
332 { /* Handle problems with rebooting on HP laptops */
333 .callback = set_bios_reboot,
334 .ident = "HP Compaq Laptop",
336 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
337 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
340 { /* Handle problems with rebooting on Dell XPS710 */
341 .callback = set_bios_reboot,
342 .ident = "Dell XPS710",
344 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
345 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
348 { /* Handle problems with rebooting on Dell DXP061 */
349 .callback = set_bios_reboot,
350 .ident = "Dell DXP061",
352 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
353 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
356 { /* Handle problems with rebooting on Sony VGN-Z540N */
357 .callback = set_bios_reboot,
358 .ident = "Sony VGN-Z540N",
360 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
361 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
364 { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */
365 .callback = set_bios_reboot,
366 .ident = "CompuLab SBC-FITPC2",
368 DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"),
369 DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"),
372 { /* Handle problems with rebooting on ASUS P4S800 */
373 .callback = set_bios_reboot,
374 .ident = "ASUS P4S800",
376 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
377 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
380 #endif /* CONFIG_X86_32 */
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;
581 machine_real_restart(MRR_BIOS);
583 reboot_type = BOOT_KBD;
589 reboot_type = BOOT_KBD;
594 efi.reset_system(reboot_mode ?
597 EFI_SUCCESS, 0, NULL);
598 reboot_type = BOOT_KBD;
602 port_cf9_safe = true;
607 u8 cf9 = inb(0xcf9) & ~6;
608 outb(cf9|2, 0xcf9); /* Request hard reset */
610 outb(cf9|6, 0xcf9); /* Actually do the reset */
613 reboot_type = BOOT_KBD;
619 void native_machine_shutdown(void)
621 /* Stop the cpus and apics */
624 /* The boot cpu is always logical cpu 0 */
625 int reboot_cpu_id = 0;
628 /* See if there has been given a command line override */
629 if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
630 cpu_online(reboot_cpu))
631 reboot_cpu_id = reboot_cpu;
634 /* Make certain the cpu I'm about to reboot on is online */
635 if (!cpu_online(reboot_cpu_id))
636 reboot_cpu_id = smp_processor_id();
638 /* Make certain I only run on the appropriate processor */
639 set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
642 * O.K Now that I'm on the appropriate processor, stop all of the
643 * others. Also disable the local irq to not receive the per-cpu
644 * timer interrupt which may trigger scheduler's load balance.
652 #ifdef CONFIG_X86_IO_APIC
656 #ifdef CONFIG_HPET_TIMER
661 x86_platform.iommu_shutdown();
665 static void __machine_emergency_restart(int emergency)
667 reboot_emergency = emergency;
668 machine_ops.emergency_restart();
671 static void native_machine_restart(char *__unused)
673 printk("machine restart\n");
677 __machine_emergency_restart(0);
680 static void native_machine_halt(void)
682 /* Stop other cpus and apics */
685 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();
760 * Don't do anything if this handler is invoked on crashing cpu.
761 * Otherwise, system will completely hang. Crashing cpu can get
762 * an NMI if system was initially booted with nmi_watchdog parameter.
764 if (cpu == crashing_cpu)
768 shootdown_callback(cpu, regs);
770 atomic_dec(&waiting_for_crash_ipi);
771 /* Assume hlt works */
779 static void smp_send_nmi_allbutself(void)
781 apic->send_IPI_allbutself(NMI_VECTOR);
785 * Halt all other CPUs, calling the specified function on each of them
787 * This function can be used to halt all other CPUs on crash
788 * or emergency reboot time. The function passed as parameter
789 * will be called inside a NMI handler on all CPUs.
791 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
796 /* Make a note of crashing cpu. Will be used in NMI callback. */
797 crashing_cpu = safe_smp_processor_id();
799 shootdown_callback = callback;
801 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
802 /* Would it be better to replace the trap vector here? */
803 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
804 NMI_FLAG_FIRST, "crash"))
805 return; /* Return what? */
807 * Ensure the new callback function is set before sending
812 smp_send_nmi_allbutself();
814 msecs = 1000; /* Wait at most a second for the other cpus to stop */
815 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
820 /* Leave the nmi callback set */
822 #else /* !CONFIG_SMP */
823 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
825 /* No other CPUs to shoot down */