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" commandline option,
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 struct dmi_system_id __initdata reboot_dmi_table[] = {
140 { /* Handle problems with rebooting on Dell E520's */
141 .callback = set_bios_reboot,
142 .ident = "Dell E520",
144 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
145 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
148 { /* Handle problems with rebooting on Dell 1300's */
149 .callback = set_bios_reboot,
150 .ident = "Dell PowerEdge 1300",
152 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
153 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
156 { /* Handle problems with rebooting on Dell 300's */
157 .callback = set_bios_reboot,
158 .ident = "Dell PowerEdge 300",
160 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
161 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
164 { /* Handle problems with rebooting on Dell Optiplex 745's SFF*/
165 .callback = set_bios_reboot,
166 .ident = "Dell OptiPlex 745",
168 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
169 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
172 { /* Handle problems with rebooting on Dell Optiplex 745's DFF*/
173 .callback = set_bios_reboot,
174 .ident = "Dell OptiPlex 745",
176 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
177 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
178 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
181 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
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, "0KW626"),
190 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
191 .callback = set_bios_reboot,
192 .ident = "Dell OptiPlex 330",
194 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
195 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
196 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
199 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
200 .callback = set_bios_reboot,
201 .ident = "Dell OptiPlex 360",
203 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
204 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
205 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
208 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G*/
209 .callback = set_bios_reboot,
210 .ident = "Dell OptiPlex 760",
212 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
213 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
214 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
217 { /* Handle problems with rebooting on Dell 2400's */
218 .callback = set_bios_reboot,
219 .ident = "Dell PowerEdge 2400",
221 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
222 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
225 { /* Handle problems with rebooting on Dell T5400's */
226 .callback = set_bios_reboot,
227 .ident = "Dell Precision T5400",
229 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
230 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
233 { /* Handle problems with rebooting on Dell T7400's */
234 .callback = set_bios_reboot,
235 .ident = "Dell Precision T7400",
237 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
238 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
241 { /* Handle problems with rebooting on HP laptops */
242 .callback = set_bios_reboot,
243 .ident = "HP Compaq Laptop",
245 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
246 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
249 { /* Handle problems with rebooting on Dell XPS710 */
250 .callback = set_bios_reboot,
251 .ident = "Dell XPS710",
253 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
254 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
257 { /* Handle problems with rebooting on Dell DXP061 */
258 .callback = set_bios_reboot,
259 .ident = "Dell DXP061",
261 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
262 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
265 { /* Handle problems with rebooting on Sony VGN-Z540N */
266 .callback = set_bios_reboot,
267 .ident = "Sony VGN-Z540N",
269 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
270 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
273 { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */
274 .callback = set_bios_reboot,
275 .ident = "CompuLab SBC-FITPC2",
277 DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"),
278 DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"),
281 { /* Handle problems with rebooting on ASUS P4S800 */
282 .callback = set_bios_reboot,
283 .ident = "ASUS P4S800",
285 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
286 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
289 { /* Handle problems with rebooting on VersaLogic Menlow boards */
290 .callback = set_bios_reboot,
291 .ident = "VersaLogic Menlow based board",
293 DMI_MATCH(DMI_BOARD_VENDOR, "VersaLogic Corporation"),
294 DMI_MATCH(DMI_BOARD_NAME, "VersaLogic Menlow board"),
297 { /* Handle reboot issue on Acer Aspire one */
298 .callback = set_bios_reboot,
299 .ident = "Acer Aspire One A110",
301 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
302 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
308 static int __init reboot_init(void)
310 dmi_check_system(reboot_dmi_table);
313 core_initcall(reboot_init);
315 extern const unsigned char machine_real_restart_asm[];
316 extern const u64 machine_real_restart_gdt[3];
318 void machine_real_restart(unsigned int type)
321 unsigned long restart_pa;
322 void (*restart_lowmem)(unsigned int);
327 /* Write zero to CMOS register number 0x0f, which the BIOS POST
328 routine will recognize as telling it to do a proper reboot. (Well
329 that's what this book in front of me says -- it may only apply to
330 the Phoenix BIOS though, it's not clear). At the same time,
331 disable NMIs by setting the top bit in the CMOS address register,
332 as we're about to do peculiar things to the CPU. I'm not sure if
333 `outb_p' is needed instead of just `outb'. Use it to be on the
334 safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
336 spin_lock(&rtc_lock);
337 CMOS_WRITE(0x00, 0x8f);
338 spin_unlock(&rtc_lock);
341 * Switch back to the initial page table.
343 load_cr3(initial_page_table);
345 /* Write 0x1234 to absolute memory location 0x472. The BIOS reads
346 this on booting to tell it to "Bypass memory test (also warm
347 boot)". This seems like a fairly standard thing that gets set by
348 REBOOT.COM programs, and the previous reset routine did this
350 *((unsigned short *)0x472) = reboot_mode;
352 /* Patch the GDT in the low memory trampoline */
353 lowmem_gdt = TRAMPOLINE_SYM(machine_real_restart_gdt);
355 restart_va = TRAMPOLINE_SYM(machine_real_restart_asm);
356 restart_pa = virt_to_phys(restart_va);
357 restart_lowmem = (void (*)(unsigned int))restart_pa;
359 /* GDT[0]: GDT self-pointer */
361 (u64)(sizeof(machine_real_restart_gdt) - 1) +
362 ((u64)virt_to_phys(lowmem_gdt) << 16);
363 /* GDT[1]: 64K real mode code segment */
365 GDT_ENTRY(0x009b, restart_pa, 0xffff);
367 /* Jump to the identity-mapped low memory code */
368 restart_lowmem(type);
370 #ifdef CONFIG_APM_MODULE
371 EXPORT_SYMBOL(machine_real_restart);
374 #endif /* CONFIG_X86_32 */
377 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
379 static int __init set_pci_reboot(const struct dmi_system_id *d)
381 if (reboot_type != BOOT_CF9) {
382 reboot_type = BOOT_CF9;
383 printk(KERN_INFO "%s series board detected. "
384 "Selecting PCI-method for reboots.\n", d->ident);
389 static struct dmi_system_id __initdata pci_reboot_dmi_table[] = {
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"),
433 static int __init pci_reboot_init(void)
435 dmi_check_system(pci_reboot_dmi_table);
438 core_initcall(pci_reboot_init);
440 static inline void kb_wait(void)
444 for (i = 0; i < 0x10000; i++) {
445 if ((inb(0x64) & 0x02) == 0)
451 static void vmxoff_nmi(int cpu, struct die_args *args)
453 cpu_emergency_vmxoff();
456 /* Use NMIs as IPIs to tell all CPUs to disable virtualization
458 static void emergency_vmx_disable_all(void)
460 /* Just make sure we won't change CPUs while doing this */
463 /* We need to disable VMX on all CPUs before rebooting, otherwise
464 * we risk hanging up the machine, because the CPU ignore INIT
465 * signals when VMX is enabled.
467 * We can't take any locks and we may be on an inconsistent
468 * state, so we use NMIs as IPIs to tell the other CPUs to disable
471 * For safety, we will avoid running the nmi_shootdown_cpus()
472 * stuff unnecessarily, but we don't have a way to check
473 * if other CPUs have VMX enabled. So we will call it only if the
474 * CPU we are running on has VMX enabled.
476 * We will miss cases where VMX is not enabled on all CPUs. This
477 * shouldn't do much harm because KVM always enable VMX on all
478 * CPUs anyway. But we can miss it on the small window where KVM
479 * is still enabling VMX.
481 if (cpu_has_vmx() && cpu_vmx_enabled()) {
482 /* Disable VMX on this CPU.
486 /* Halt and disable VMX on the other CPUs */
487 nmi_shootdown_cpus(vmxoff_nmi);
493 void __attribute__((weak)) mach_reboot_fixups(void)
498 * Windows compatible x86 hardware expects the following on reboot:
500 * 1) If the FADT has the ACPI reboot register flag set, try it
501 * 2) If still alive, write to the keyboard controller
502 * 3) If still alive, write to the ACPI reboot register again
503 * 4) If still alive, write to the keyboard controller again
505 * If the machine is still alive at this stage, it gives up. We default to
506 * following the same pattern, except that if we're still alive after (4) we'll
507 * try to force a triple fault and then cycle between hitting the keyboard
508 * controller and doing that
510 static void native_machine_emergency_restart(void)
514 int orig_reboot_type = reboot_type;
516 if (reboot_emergency)
517 emergency_vmx_disable_all();
519 tboot_shutdown(TB_SHUTDOWN_REBOOT);
521 /* Tell the BIOS if we want cold or warm reboot */
522 *((unsigned short *)__va(0x472)) = reboot_mode;
525 /* Could also try the reset bit in the Hammer NB */
526 switch (reboot_type) {
528 mach_reboot_fixups(); /* for board specific fixups */
530 for (i = 0; i < 10; i++) {
533 outb(0xfe, 0x64); /* pulse reset low */
536 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
538 reboot_type = BOOT_ACPI;
540 reboot_type = BOOT_TRIPLE;
546 __asm__ __volatile__("int3");
548 reboot_type = BOOT_KBD;
553 machine_real_restart(MRR_BIOS);
555 reboot_type = BOOT_KBD;
561 reboot_type = BOOT_KBD;
566 efi.reset_system(reboot_mode ?
569 EFI_SUCCESS, 0, NULL);
570 reboot_type = BOOT_KBD;
574 port_cf9_safe = true;
579 u8 cf9 = inb(0xcf9) & ~6;
580 outb(cf9|2, 0xcf9); /* Request hard reset */
582 outb(cf9|6, 0xcf9); /* Actually do the reset */
585 reboot_type = BOOT_KBD;
591 void native_machine_shutdown(void)
593 /* Stop the cpus and apics */
596 /* The boot cpu is always logical cpu 0 */
597 int reboot_cpu_id = 0;
600 /* See if there has been given a command line override */
601 if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
602 cpu_online(reboot_cpu))
603 reboot_cpu_id = reboot_cpu;
606 /* Make certain the cpu I'm about to reboot on is online */
607 if (!cpu_online(reboot_cpu_id))
608 reboot_cpu_id = smp_processor_id();
610 /* Make certain I only run on the appropriate processor */
611 set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
613 /* O.K Now that I'm on the appropriate processor,
614 * stop all of the others.
621 #ifdef CONFIG_X86_IO_APIC
625 #ifdef CONFIG_HPET_TIMER
630 x86_platform.iommu_shutdown();
634 static void __machine_emergency_restart(int emergency)
636 reboot_emergency = emergency;
637 machine_ops.emergency_restart();
640 static void native_machine_restart(char *__unused)
642 printk("machine restart\n");
646 __machine_emergency_restart(0);
649 static void native_machine_halt(void)
651 /* stop other cpus and apics */
654 tboot_shutdown(TB_SHUTDOWN_HALT);
660 static void native_machine_power_off(void)
667 /* a fallback in case there is no PM info available */
668 tboot_shutdown(TB_SHUTDOWN_HALT);
671 struct machine_ops machine_ops = {
672 .power_off = native_machine_power_off,
673 .shutdown = native_machine_shutdown,
674 .emergency_restart = native_machine_emergency_restart,
675 .restart = native_machine_restart,
676 .halt = native_machine_halt,
678 .crash_shutdown = native_machine_crash_shutdown,
682 void machine_power_off(void)
684 machine_ops.power_off();
687 void machine_shutdown(void)
689 machine_ops.shutdown();
692 void machine_emergency_restart(void)
694 __machine_emergency_restart(1);
697 void machine_restart(char *cmd)
699 machine_ops.restart(cmd);
702 void machine_halt(void)
708 void machine_crash_shutdown(struct pt_regs *regs)
710 machine_ops.crash_shutdown(regs);
715 #if defined(CONFIG_SMP)
717 /* This keeps a track of which one is crashing cpu. */
718 static int crashing_cpu;
719 static nmi_shootdown_cb shootdown_callback;
721 static atomic_t waiting_for_crash_ipi;
723 static int crash_nmi_callback(struct notifier_block *self,
724 unsigned long val, void *data)
731 cpu = raw_smp_processor_id();
733 /* Don't do anything if this handler is invoked on crashing cpu.
734 * Otherwise, system will completely hang. Crashing cpu can get
735 * an NMI if system was initially booted with nmi_watchdog parameter.
737 if (cpu == crashing_cpu)
741 shootdown_callback(cpu, (struct die_args *)data);
743 atomic_dec(&waiting_for_crash_ipi);
744 /* Assume hlt works */
752 static void smp_send_nmi_allbutself(void)
754 apic->send_IPI_allbutself(NMI_VECTOR);
757 static struct notifier_block crash_nmi_nb = {
758 .notifier_call = crash_nmi_callback,
759 /* we want to be the first one called */
760 .priority = NMI_LOCAL_HIGH_PRIOR+1,
763 /* Halt all other CPUs, calling the specified function on each of them
765 * This function can be used to halt all other CPUs on crash
766 * or emergency reboot time. The function passed as parameter
767 * will be called inside a NMI handler on all CPUs.
769 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
774 /* Make a note of crashing cpu. Will be used in NMI callback.*/
775 crashing_cpu = safe_smp_processor_id();
777 shootdown_callback = callback;
779 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
780 /* Would it be better to replace the trap vector here? */
781 if (register_die_notifier(&crash_nmi_nb))
782 return; /* return what? */
783 /* Ensure the new callback function is set before sending
788 smp_send_nmi_allbutself();
790 msecs = 1000; /* Wait at most a second for the other cpus to stop */
791 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
796 /* Leave the nmi callback set */
798 #else /* !CONFIG_SMP */
799 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
801 /* No other CPUs to shoot down */