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>
28 # include <asm/x86_init.h>
32 * Power off function, if any
34 void (*pm_power_off)(void);
35 EXPORT_SYMBOL(pm_power_off);
37 static const struct desc_ptr no_idt = {};
38 static int reboot_mode;
39 enum reboot_type reboot_type = BOOT_ACPI;
42 #if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
43 static int reboot_cpu = -1;
46 /* This is set if we need to go through the 'emergency' path.
47 * When machine_emergency_restart() is called, we may be on
48 * an inconsistent state and won't be able to do a clean cleanup
50 static int reboot_emergency;
52 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */
53 bool port_cf9_safe = false;
55 /* reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
56 warm Don't set the cold reboot flag
57 cold Set the cold reboot flag
58 bios Reboot by jumping through the BIOS (only for X86_32)
59 smp Reboot by executing reset on BSP or other CPU (only for X86_32)
60 triple Force a triple fault (init)
61 kbd Use the keyboard controller. cold reset (default)
62 acpi Use the RESET_REG in the FADT
63 efi Use efi reset_system runtime service
64 pci Use the so-called "PCI reset register", CF9
65 force Avoid anything that could hang.
67 static int __init reboot_setup(char *str)
82 if (isdigit(*(str+1))) {
83 reboot_cpu = (int) (*(str+1) - '0');
84 if (isdigit(*(str+2)))
85 reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0');
87 /* we will leave sorting out the final value
88 when we are ready to reboot, since we might not
89 have detected BSP APIC ID or smp_num_cpu */
91 #endif /* CONFIG_SMP */
108 str = strchr(str, ',');
117 __setup("reboot=", reboot_setup);
122 * Reboot options and system auto-detection code provided by
123 * Dell Inc. so their systems "just work". :-)
127 * Some machines require the "reboot=b" or "reboot=k" commandline options,
128 * this quirk makes that automatic.
130 static int __init set_bios_reboot(const struct dmi_system_id *d)
132 if (reboot_type != BOOT_BIOS) {
133 reboot_type = BOOT_BIOS;
134 printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident);
139 static int __init set_kbd_reboot(const struct dmi_system_id *d)
141 if (reboot_type != BOOT_KBD) {
142 reboot_type = BOOT_KBD;
143 printk(KERN_INFO "%s series board detected. Selecting KBD-method for reboot.\n", d->ident);
148 static struct dmi_system_id __initdata reboot_dmi_table[] = {
149 { /* Handle problems with rebooting on Dell E520's */
150 .callback = set_bios_reboot,
151 .ident = "Dell E520",
153 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
154 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
157 { /* Handle problems with rebooting on Dell 1300's */
158 .callback = set_bios_reboot,
159 .ident = "Dell PowerEdge 1300",
161 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
162 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
165 { /* Handle problems with rebooting on Dell 300's */
166 .callback = set_bios_reboot,
167 .ident = "Dell PowerEdge 300",
169 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
170 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
173 { /* Handle problems with rebooting on Dell Optiplex 745's SFF*/
174 .callback = set_bios_reboot,
175 .ident = "Dell OptiPlex 745",
177 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
178 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
181 { /* Handle problems with rebooting on Dell Optiplex 745's DFF*/
182 .callback = set_bios_reboot,
183 .ident = "Dell OptiPlex 745",
185 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
186 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
187 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
190 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
191 .callback = set_bios_reboot,
192 .ident = "Dell OptiPlex 745",
194 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
195 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
196 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
199 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
200 .callback = set_bios_reboot,
201 .ident = "Dell OptiPlex 330",
203 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
204 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
205 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
208 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
209 .callback = set_bios_reboot,
210 .ident = "Dell OptiPlex 360",
212 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
213 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
214 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
217 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G*/
218 .callback = set_bios_reboot,
219 .ident = "Dell OptiPlex 760",
221 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
222 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
223 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
226 { /* Handle problems with rebooting on Dell 2400's */
227 .callback = set_bios_reboot,
228 .ident = "Dell PowerEdge 2400",
230 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
231 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
234 { /* Handle problems with rebooting on Dell T5400's */
235 .callback = set_bios_reboot,
236 .ident = "Dell Precision T5400",
238 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
239 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
242 { /* Handle problems with rebooting on Dell T7400's */
243 .callback = set_bios_reboot,
244 .ident = "Dell Precision T7400",
246 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
247 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
250 { /* Handle problems with rebooting on HP laptops */
251 .callback = set_bios_reboot,
252 .ident = "HP Compaq Laptop",
254 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
255 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
258 { /* Handle problems with rebooting on Dell XPS710 */
259 .callback = set_bios_reboot,
260 .ident = "Dell XPS710",
262 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
263 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
266 { /* Handle problems with rebooting on Dell DXP061 */
267 .callback = set_bios_reboot,
268 .ident = "Dell DXP061",
270 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
271 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
274 { /* Handle problems with rebooting on Sony VGN-Z540N */
275 .callback = set_bios_reboot,
276 .ident = "Sony VGN-Z540N",
278 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
279 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
282 { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */
283 .callback = set_bios_reboot,
284 .ident = "CompuLab SBC-FITPC2",
286 DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"),
287 DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"),
290 { /* Handle problems with rebooting on ASUS P4S800 */
291 .callback = set_bios_reboot,
292 .ident = "ASUS P4S800",
294 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
295 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
298 { /* Handle reboot issue on Acer Aspire one */
299 .callback = set_kbd_reboot,
300 .ident = "Acer Aspire One A110",
302 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
303 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
309 static int __init reboot_init(void)
311 dmi_check_system(reboot_dmi_table);
314 core_initcall(reboot_init);
316 extern const unsigned char machine_real_restart_asm[];
317 extern const u64 machine_real_restart_gdt[3];
319 void machine_real_restart(unsigned int type)
322 unsigned long restart_pa;
323 void (*restart_lowmem)(unsigned int);
328 /* Write zero to CMOS register number 0x0f, which the BIOS POST
329 routine will recognize as telling it to do a proper reboot. (Well
330 that's what this book in front of me says -- it may only apply to
331 the Phoenix BIOS though, it's not clear). At the same time,
332 disable NMIs by setting the top bit in the CMOS address register,
333 as we're about to do peculiar things to the CPU. I'm not sure if
334 `outb_p' is needed instead of just `outb'. Use it to be on the
335 safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
337 spin_lock(&rtc_lock);
338 CMOS_WRITE(0x00, 0x8f);
339 spin_unlock(&rtc_lock);
342 * Switch back to the initial page table.
344 load_cr3(initial_page_table);
346 /* Write 0x1234 to absolute memory location 0x472. The BIOS reads
347 this on booting to tell it to "Bypass memory test (also warm
348 boot)". This seems like a fairly standard thing that gets set by
349 REBOOT.COM programs, and the previous reset routine did this
351 *((unsigned short *)0x472) = reboot_mode;
353 /* Patch the GDT in the low memory trampoline */
354 lowmem_gdt = TRAMPOLINE_SYM(machine_real_restart_gdt);
356 restart_va = TRAMPOLINE_SYM(machine_real_restart_asm);
357 restart_pa = virt_to_phys(restart_va);
358 restart_lowmem = (void (*)(unsigned int))restart_pa;
360 /* GDT[0]: GDT self-pointer */
362 (u64)(sizeof(machine_real_restart_gdt) - 1) +
363 ((u64)virt_to_phys(lowmem_gdt) << 16);
364 /* GDT[1]: 64K real mode code segment */
366 GDT_ENTRY(0x009b, restart_pa, 0xffff);
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"),
455 { /* Handle problems with rebooting on the Precision M6600. */
456 .callback = set_pci_reboot,
457 .ident = "Dell OptiPlex 990",
459 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
460 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
463 { /* Handle problems with rebooting on the Dell PowerEdge C6100. */
464 .callback = set_pci_reboot,
465 .ident = "Dell PowerEdge C6100",
467 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
468 DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
471 { /* Some C6100 machines were shipped with vendor being 'Dell'. */
472 .callback = set_pci_reboot,
473 .ident = "Dell PowerEdge C6100",
475 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
476 DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
479 { /* Handle problems with rebooting on the Precision M6600. */
480 .callback = set_pci_reboot,
481 .ident = "Dell OptiPlex 990",
483 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
484 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
490 static int __init pci_reboot_init(void)
492 dmi_check_system(pci_reboot_dmi_table);
495 core_initcall(pci_reboot_init);
497 static inline void kb_wait(void)
501 for (i = 0; i < 0x10000; i++) {
502 if ((inb(0x64) & 0x02) == 0)
508 static void vmxoff_nmi(int cpu, struct pt_regs *regs)
510 cpu_emergency_vmxoff();
513 /* Use NMIs as IPIs to tell all CPUs to disable virtualization
515 static void emergency_vmx_disable_all(void)
517 /* Just make sure we won't change CPUs while doing this */
520 /* We need to disable VMX on all CPUs before rebooting, otherwise
521 * we risk hanging up the machine, because the CPU ignore INIT
522 * signals when VMX is enabled.
524 * We can't take any locks and we may be on an inconsistent
525 * state, so we use NMIs as IPIs to tell the other CPUs to disable
528 * For safety, we will avoid running the nmi_shootdown_cpus()
529 * stuff unnecessarily, but we don't have a way to check
530 * if other CPUs have VMX enabled. So we will call it only if the
531 * CPU we are running on has VMX enabled.
533 * We will miss cases where VMX is not enabled on all CPUs. This
534 * shouldn't do much harm because KVM always enable VMX on all
535 * CPUs anyway. But we can miss it on the small window where KVM
536 * is still enabling VMX.
538 if (cpu_has_vmx() && cpu_vmx_enabled()) {
539 /* Disable VMX on this CPU.
543 /* Halt and disable VMX on the other CPUs */
544 nmi_shootdown_cpus(vmxoff_nmi);
550 void __attribute__((weak)) mach_reboot_fixups(void)
555 * Windows compatible x86 hardware expects the following on reboot:
557 * 1) If the FADT has the ACPI reboot register flag set, try it
558 * 2) If still alive, write to the keyboard controller
559 * 3) If still alive, write to the ACPI reboot register again
560 * 4) If still alive, write to the keyboard controller again
562 * If the machine is still alive at this stage, it gives up. We default to
563 * following the same pattern, except that if we're still alive after (4) we'll
564 * try to force a triple fault and then cycle between hitting the keyboard
565 * controller and doing that
567 static void native_machine_emergency_restart(void)
571 int orig_reboot_type = reboot_type;
573 if (reboot_emergency)
574 emergency_vmx_disable_all();
576 tboot_shutdown(TB_SHUTDOWN_REBOOT);
578 /* Tell the BIOS if we want cold or warm reboot */
579 *((unsigned short *)__va(0x472)) = reboot_mode;
582 /* Could also try the reset bit in the Hammer NB */
583 switch (reboot_type) {
585 mach_reboot_fixups(); /* for board specific fixups */
587 for (i = 0; i < 10; i++) {
590 outb(0xfe, 0x64); /* pulse reset low */
593 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
595 reboot_type = BOOT_ACPI;
597 reboot_type = BOOT_TRIPLE;
603 __asm__ __volatile__("int3");
605 reboot_type = BOOT_KBD;
610 machine_real_restart(MRR_BIOS);
612 reboot_type = BOOT_KBD;
618 reboot_type = BOOT_KBD;
622 if (efi_enabled(EFI_RUNTIME_SERVICES))
623 efi.reset_system(reboot_mode ?
626 EFI_SUCCESS, 0, NULL);
627 reboot_type = BOOT_KBD;
631 port_cf9_safe = true;
636 u8 cf9 = inb(0xcf9) & ~6;
637 outb(cf9|2, 0xcf9); /* Request hard reset */
639 outb(cf9|6, 0xcf9); /* Actually do the reset */
642 reboot_type = BOOT_KBD;
648 void native_machine_shutdown(void)
650 /* Stop the cpus and apics */
653 /* The boot cpu is always logical cpu 0 */
654 int reboot_cpu_id = 0;
657 #ifdef CONFIG_X86_IO_APIC
664 /* See if there has been given a command line override */
665 if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
666 cpu_online(reboot_cpu))
667 reboot_cpu_id = reboot_cpu;
670 /* Make certain the cpu I'm about to reboot on is online */
671 if (!cpu_online(reboot_cpu_id))
672 reboot_cpu_id = smp_processor_id();
674 /* Make certain I only run on the appropriate processor */
675 set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
677 /* O.K Now that I'm on the appropriate processor,
678 * stop all of the others.
685 #ifdef CONFIG_HPET_TIMER
690 x86_platform.iommu_shutdown();
694 static void __machine_emergency_restart(int emergency)
696 reboot_emergency = emergency;
697 machine_ops.emergency_restart();
700 static void native_machine_restart(char *__unused)
702 printk("machine restart\n");
706 __machine_emergency_restart(0);
709 static void native_machine_halt(void)
711 /* stop other cpus and apics */
714 tboot_shutdown(TB_SHUTDOWN_HALT);
720 static void native_machine_power_off(void)
727 /* a fallback in case there is no PM info available */
728 tboot_shutdown(TB_SHUTDOWN_HALT);
731 struct machine_ops machine_ops = {
732 .power_off = native_machine_power_off,
733 .shutdown = native_machine_shutdown,
734 .emergency_restart = native_machine_emergency_restart,
735 .restart = native_machine_restart,
736 .halt = native_machine_halt,
738 .crash_shutdown = native_machine_crash_shutdown,
742 void machine_power_off(void)
744 machine_ops.power_off();
747 void machine_shutdown(void)
749 machine_ops.shutdown();
752 void machine_emergency_restart(void)
754 __machine_emergency_restart(1);
757 void machine_restart(char *cmd)
759 machine_ops.restart(cmd);
762 void machine_halt(void)
768 void machine_crash_shutdown(struct pt_regs *regs)
770 machine_ops.crash_shutdown(regs);
775 #if defined(CONFIG_SMP)
777 /* This keeps a track of which one is crashing cpu. */
778 static int crashing_cpu;
779 static nmi_shootdown_cb shootdown_callback;
781 static atomic_t waiting_for_crash_ipi;
783 static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
787 cpu = raw_smp_processor_id();
789 /* Don't do anything if this handler is invoked on crashing cpu.
790 * Otherwise, system will completely hang. Crashing cpu can get
791 * an NMI if system was initially booted with nmi_watchdog parameter.
793 if (cpu == crashing_cpu)
797 shootdown_callback(cpu, regs);
799 atomic_dec(&waiting_for_crash_ipi);
800 /* Assume hlt works */
808 static void smp_send_nmi_allbutself(void)
810 apic->send_IPI_allbutself(NMI_VECTOR);
813 /* Halt all other CPUs, calling the specified function on each of them
815 * This function can be used to halt all other CPUs on crash
816 * or emergency reboot time. The function passed as parameter
817 * will be called inside a NMI handler on all CPUs.
819 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
824 /* Make a note of crashing cpu. Will be used in NMI callback.*/
825 crashing_cpu = safe_smp_processor_id();
827 shootdown_callback = callback;
829 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
830 /* Would it be better to replace the trap vector here? */
831 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
832 NMI_FLAG_FIRST, "crash"))
833 return; /* return what? */
834 /* Ensure the new callback function is set before sending
839 smp_send_nmi_allbutself();
841 msecs = 1000; /* Wait at most a second for the other cpus to stop */
842 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
847 /* Leave the nmi callback set */
849 #else /* !CONFIG_SMP */
850 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
852 /* No other CPUs to shoot down */