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;
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;
56 * This is set if we need to go through the 'emergency' path.
57 * When machine_emergency_restart() is called, we may be on
58 * an inconsistent state and won't be able to do a clean cleanup
60 static int reboot_emergency;
62 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */
63 bool port_cf9_safe = false;
66 * reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
67 * warm Don't set the cold reboot flag
68 * cold Set the cold reboot flag
69 * bios Reboot by jumping through the BIOS (only for X86_32)
70 * smp Reboot by executing reset on BSP or other CPU (only for X86_32)
71 * triple Force a triple fault (init)
72 * kbd Use the keyboard controller. cold reset (default)
73 * acpi Use the RESET_REG in the FADT
74 * efi Use efi reset_system runtime service
75 * pci Use the so-called "PCI reset register", CF9
76 * force Avoid anything that could hang.
78 static int __init reboot_setup(char *str)
82 * Having anything passed on the command line via
83 * reboot= will cause us to disable DMI checking
100 if (isdigit(*(str+1))) {
101 reboot_cpu = (int) (*(str+1) - '0');
102 if (isdigit(*(str+2)))
103 reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0');
106 * We will leave sorting out the final value
107 * when we are ready to reboot, since we might not
108 * have detected BSP APIC ID or smp_num_cpu
111 #endif /* CONFIG_SMP */
128 str = strchr(str, ',');
137 __setup("reboot=", reboot_setup);
142 * Reboot options and system auto-detection code provided by
143 * Dell Inc. so their systems "just work". :-)
147 * Some machines require the "reboot=b" or "reboot=k" commandline options,
148 * this quirk makes that automatic.
150 static int __init set_bios_reboot(const struct dmi_system_id *d)
152 if (reboot_type != BOOT_BIOS) {
153 reboot_type = BOOT_BIOS;
154 printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident);
159 extern const unsigned char machine_real_restart_asm[];
160 extern const u64 machine_real_restart_gdt[3];
162 void machine_real_restart(unsigned int type)
165 unsigned long restart_pa;
166 void (*restart_lowmem)(unsigned int);
172 * Write zero to CMOS register number 0x0f, which the BIOS POST
173 * routine will recognize as telling it to do a proper reboot. (Well
174 * that's what this book in front of me says -- it may only apply to
175 * the Phoenix BIOS though, it's not clear). At the same time,
176 * disable NMIs by setting the top bit in the CMOS address register,
177 * as we're about to do peculiar things to the CPU. I'm not sure if
178 * `outb_p' is needed instead of just `outb'. Use it to be on the
179 * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
181 spin_lock(&rtc_lock);
182 CMOS_WRITE(0x00, 0x8f);
183 spin_unlock(&rtc_lock);
186 * Switch back to the initial page table.
188 load_cr3(initial_page_table);
191 * Write 0x1234 to absolute memory location 0x472. The BIOS reads
192 * this on booting to tell it to "Bypass memory test (also warm
193 * boot)". This seems like a fairly standard thing that gets set by
194 * REBOOT.COM programs, and the previous reset routine did this
196 *((unsigned short *)0x472) = reboot_mode;
198 /* Patch the GDT in the low memory trampoline */
199 lowmem_gdt = TRAMPOLINE_SYM(machine_real_restart_gdt);
201 restart_va = TRAMPOLINE_SYM(machine_real_restart_asm);
202 restart_pa = virt_to_phys(restart_va);
203 restart_lowmem = (void (*)(unsigned int))restart_pa;
205 /* GDT[0]: GDT self-pointer */
207 (u64)(sizeof(machine_real_restart_gdt) - 1) +
208 ((u64)virt_to_phys(lowmem_gdt) << 16);
209 /* GDT[1]: 64K real mode code segment */
211 GDT_ENTRY(0x009b, restart_pa, 0xffff);
213 /* Jump to the identity-mapped low memory code */
214 restart_lowmem(type);
216 #ifdef CONFIG_APM_MODULE
217 EXPORT_SYMBOL(machine_real_restart);
220 #endif /* CONFIG_X86_32 */
223 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
225 static int __init set_pci_reboot(const struct dmi_system_id *d)
227 if (reboot_type != BOOT_CF9) {
228 reboot_type = BOOT_CF9;
229 printk(KERN_INFO "%s series board detected. "
230 "Selecting PCI-method for reboots.\n", d->ident);
235 static int __init set_kbd_reboot(const struct dmi_system_id *d)
237 if (reboot_type != BOOT_KBD) {
238 reboot_type = BOOT_KBD;
239 printk(KERN_INFO "%s series board detected. Selecting KBD-method for reboot.\n", d->ident);
245 * This is a single dmi_table handling all reboot quirks. Note that
246 * REBOOT_BIOS is only available for 32bit
248 static struct dmi_system_id __initdata reboot_dmi_table[] = {
250 { /* Handle problems with rebooting on Dell E520's */
251 .callback = set_bios_reboot,
252 .ident = "Dell E520",
254 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
255 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
258 { /* Handle problems with rebooting on Dell 1300's */
259 .callback = set_bios_reboot,
260 .ident = "Dell PowerEdge 1300",
262 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
263 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
266 { /* Handle problems with rebooting on Dell 300's */
267 .callback = set_bios_reboot,
268 .ident = "Dell PowerEdge 300",
270 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
271 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
274 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */
275 .callback = set_bios_reboot,
276 .ident = "Dell OptiPlex 745",
278 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
279 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
282 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */
283 .callback = set_bios_reboot,
284 .ident = "Dell OptiPlex 745",
286 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
287 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
288 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
291 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
292 .callback = set_bios_reboot,
293 .ident = "Dell OptiPlex 745",
295 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
296 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
297 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
300 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
301 .callback = set_bios_reboot,
302 .ident = "Dell OptiPlex 330",
304 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
305 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
306 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
309 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
310 .callback = set_bios_reboot,
311 .ident = "Dell OptiPlex 360",
313 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
314 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
315 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
318 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
319 .callback = set_bios_reboot,
320 .ident = "Dell OptiPlex 760",
322 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
323 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
324 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
327 { /* Handle problems with rebooting on Dell 2400's */
328 .callback = set_bios_reboot,
329 .ident = "Dell PowerEdge 2400",
331 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
332 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
335 { /* Handle problems with rebooting on Dell T5400's */
336 .callback = set_bios_reboot,
337 .ident = "Dell Precision T5400",
339 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
340 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
343 { /* Handle problems with rebooting on Dell T7400's */
344 .callback = set_bios_reboot,
345 .ident = "Dell Precision T7400",
347 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
348 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
351 { /* Handle problems with rebooting on HP laptops */
352 .callback = set_bios_reboot,
353 .ident = "HP Compaq Laptop",
355 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
356 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
359 { /* Handle problems with rebooting on Dell XPS710 */
360 .callback = set_bios_reboot,
361 .ident = "Dell XPS710",
363 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
364 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
367 { /* Handle problems with rebooting on Dell DXP061 */
368 .callback = set_bios_reboot,
369 .ident = "Dell DXP061",
371 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
372 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
375 { /* Handle problems with rebooting on Sony VGN-Z540N */
376 .callback = set_bios_reboot,
377 .ident = "Sony VGN-Z540N",
379 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
380 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
383 { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */
384 .callback = set_bios_reboot,
385 .ident = "CompuLab SBC-FITPC2",
387 DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"),
388 DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"),
391 { /* Handle problems with rebooting on ASUS P4S800 */
392 .callback = set_bios_reboot,
393 .ident = "ASUS P4S800",
395 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
396 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
399 #endif /* CONFIG_X86_32 */
401 { /* Handle reboot issue on Acer Aspire one */
402 .callback = set_kbd_reboot,
403 .ident = "Acer Aspire One A110",
405 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
406 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
409 { /* Handle problems with rebooting on Apple MacBook5 */
410 .callback = set_pci_reboot,
411 .ident = "Apple MacBook5",
413 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
414 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
417 { /* Handle problems with rebooting on Apple MacBookPro5 */
418 .callback = set_pci_reboot,
419 .ident = "Apple MacBookPro5",
421 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
422 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
425 { /* Handle problems with rebooting on Apple Macmini3,1 */
426 .callback = set_pci_reboot,
427 .ident = "Apple Macmini3,1",
429 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
430 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
433 { /* Handle problems with rebooting on the iMac9,1. */
434 .callback = set_pci_reboot,
435 .ident = "Apple iMac9,1",
437 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
438 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
441 { /* Handle problems with rebooting on the Latitude E6320. */
442 .callback = set_pci_reboot,
443 .ident = "Dell Latitude E6320",
445 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
446 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
449 { /* Handle problems with rebooting on the Latitude E5420. */
450 .callback = set_pci_reboot,
451 .ident = "Dell Latitude E5420",
453 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
454 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
457 { /* Handle problems with rebooting on the Latitude E6420. */
458 .callback = set_pci_reboot,
459 .ident = "Dell Latitude E6420",
461 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
462 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
465 { /* Handle problems with rebooting on the OptiPlex 990. */
466 .callback = set_pci_reboot,
467 .ident = "Dell OptiPlex 990",
469 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
470 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
476 static int __init reboot_init(void)
479 * Only do the DMI check if reboot_type hasn't been overridden
480 * on the command line
483 dmi_check_system(reboot_dmi_table);
486 core_initcall(reboot_init);
488 static inline void kb_wait(void)
492 for (i = 0; i < 0x10000; i++) {
493 if ((inb(0x64) & 0x02) == 0)
499 static void vmxoff_nmi(int cpu, struct pt_regs *regs)
501 cpu_emergency_vmxoff();
504 /* Use NMIs as IPIs to tell all CPUs to disable virtualization */
505 static void emergency_vmx_disable_all(void)
507 /* Just make sure we won't change CPUs while doing this */
511 * We need to disable VMX on all CPUs before rebooting, otherwise
512 * we risk hanging up the machine, because the CPU ignore INIT
513 * signals when VMX is enabled.
515 * We can't take any locks and we may be on an inconsistent
516 * state, so we use NMIs as IPIs to tell the other CPUs to disable
519 * For safety, we will avoid running the nmi_shootdown_cpus()
520 * stuff unnecessarily, but we don't have a way to check
521 * if other CPUs have VMX enabled. So we will call it only if the
522 * CPU we are running on has VMX enabled.
524 * We will miss cases where VMX is not enabled on all CPUs. This
525 * shouldn't do much harm because KVM always enable VMX on all
526 * CPUs anyway. But we can miss it on the small window where KVM
527 * is still enabling VMX.
529 if (cpu_has_vmx() && cpu_vmx_enabled()) {
530 /* Disable VMX on this CPU. */
533 /* Halt and disable VMX on the other CPUs */
534 nmi_shootdown_cpus(vmxoff_nmi);
540 void __attribute__((weak)) mach_reboot_fixups(void)
545 * Windows compatible x86 hardware expects the following on reboot:
547 * 1) If the FADT has the ACPI reboot register flag set, try it
548 * 2) If still alive, write to the keyboard controller
549 * 3) If still alive, write to the ACPI reboot register again
550 * 4) If still alive, write to the keyboard controller again
552 * If the machine is still alive at this stage, it gives up. We default to
553 * following the same pattern, except that if we're still alive after (4) we'll
554 * try to force a triple fault and then cycle between hitting the keyboard
555 * controller and doing that
557 static void native_machine_emergency_restart(void)
561 int orig_reboot_type = reboot_type;
563 if (reboot_emergency)
564 emergency_vmx_disable_all();
566 tboot_shutdown(TB_SHUTDOWN_REBOOT);
568 /* Tell the BIOS if we want cold or warm reboot */
569 *((unsigned short *)__va(0x472)) = reboot_mode;
572 /* Could also try the reset bit in the Hammer NB */
573 switch (reboot_type) {
575 mach_reboot_fixups(); /* For board specific fixups */
577 for (i = 0; i < 10; i++) {
580 outb(0xfe, 0x64); /* Pulse reset low */
583 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
585 reboot_type = BOOT_ACPI;
587 reboot_type = BOOT_TRIPLE;
593 __asm__ __volatile__("int3");
595 reboot_type = BOOT_KBD;
600 machine_real_restart(MRR_BIOS);
602 reboot_type = BOOT_KBD;
608 reboot_type = BOOT_KBD;
613 efi.reset_system(reboot_mode ?
616 EFI_SUCCESS, 0, NULL);
617 reboot_type = BOOT_KBD;
621 port_cf9_safe = true;
626 u8 cf9 = inb(0xcf9) & ~6;
627 outb(cf9|2, 0xcf9); /* Request hard reset */
629 outb(cf9|6, 0xcf9); /* Actually do the reset */
632 reboot_type = BOOT_KBD;
638 void native_machine_shutdown(void)
640 /* Stop the cpus and apics */
643 /* The boot cpu is always logical cpu 0 */
644 int reboot_cpu_id = 0;
647 /* See if there has been given a command line override */
648 if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
649 cpu_online(reboot_cpu))
650 reboot_cpu_id = reboot_cpu;
653 /* Make certain the cpu I'm about to reboot on is online */
654 if (!cpu_online(reboot_cpu_id))
655 reboot_cpu_id = smp_processor_id();
657 /* Make certain I only run on the appropriate processor */
658 set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
661 * O.K Now that I'm on the appropriate processor,
662 * stop all of the others.
669 #ifdef CONFIG_X86_IO_APIC
673 #ifdef CONFIG_HPET_TIMER
678 x86_platform.iommu_shutdown();
682 static void __machine_emergency_restart(int emergency)
684 reboot_emergency = emergency;
685 machine_ops.emergency_restart();
688 static void native_machine_restart(char *__unused)
690 printk("machine restart\n");
694 __machine_emergency_restart(0);
697 static void native_machine_halt(void)
699 /* Stop other cpus and apics */
702 tboot_shutdown(TB_SHUTDOWN_HALT);
707 static void native_machine_power_off(void)
714 /* A fallback in case there is no PM info available */
715 tboot_shutdown(TB_SHUTDOWN_HALT);
718 struct machine_ops machine_ops = {
719 .power_off = native_machine_power_off,
720 .shutdown = native_machine_shutdown,
721 .emergency_restart = native_machine_emergency_restart,
722 .restart = native_machine_restart,
723 .halt = native_machine_halt,
725 .crash_shutdown = native_machine_crash_shutdown,
729 void machine_power_off(void)
731 machine_ops.power_off();
734 void machine_shutdown(void)
736 machine_ops.shutdown();
739 void machine_emergency_restart(void)
741 __machine_emergency_restart(1);
744 void machine_restart(char *cmd)
746 machine_ops.restart(cmd);
749 void machine_halt(void)
755 void machine_crash_shutdown(struct pt_regs *regs)
757 machine_ops.crash_shutdown(regs);
762 #if defined(CONFIG_SMP)
764 /* This keeps a track of which one is crashing cpu. */
765 static int crashing_cpu;
766 static nmi_shootdown_cb shootdown_callback;
768 static atomic_t waiting_for_crash_ipi;
770 static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
774 cpu = raw_smp_processor_id();
777 * Don't do anything if this handler is invoked on crashing cpu.
778 * Otherwise, system will completely hang. Crashing cpu can get
779 * an NMI if system was initially booted with nmi_watchdog parameter.
781 if (cpu == crashing_cpu)
785 shootdown_callback(cpu, regs);
787 atomic_dec(&waiting_for_crash_ipi);
788 /* Assume hlt works */
796 static void smp_send_nmi_allbutself(void)
798 apic->send_IPI_allbutself(NMI_VECTOR);
802 * Halt all other CPUs, calling the specified function on each of them
804 * This function can be used to halt all other CPUs on crash
805 * or emergency reboot time. The function passed as parameter
806 * will be called inside a NMI handler on all CPUs.
808 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
813 /* Make a note of crashing cpu. Will be used in NMI callback. */
814 crashing_cpu = safe_smp_processor_id();
816 shootdown_callback = callback;
818 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
819 /* Would it be better to replace the trap vector here? */
820 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
821 NMI_FLAG_FIRST, "crash"))
822 return; /* Return what? */
824 * Ensure the new callback function is set before sending
829 smp_send_nmi_allbutself();
831 msecs = 1000; /* Wait at most a second for the other cpus to stop */
832 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
837 /* Leave the nmi callback set */
839 #else /* !CONFIG_SMP */
840 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
842 /* No other CPUs to shoot down */