1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
3 #include <linux/module.h>
4 #include <linux/reboot.h>
5 #include <linux/init.h>
9 #include <linux/sched.h>
10 #include <linux/tboot.h>
11 #include <linux/delay.h>
12 #include <acpi/reboot.h>
17 #include <asm/pgtable.h>
18 #include <asm/proto.h>
19 #include <asm/reboot_fixups.h>
20 #include <asm/reboot.h>
21 #include <asm/pci_x86.h>
22 #include <asm/virtext.h>
27 #include <linux/ctype.h>
28 #include <linux/mc146818rtc.h>
29 #include <asm/realmode.h>
30 #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 = {};
41 * This is set if we need to go through the 'emergency' path.
42 * When machine_emergency_restart() is called, we may be on
43 * an inconsistent state and won't be able to do a clean cleanup
45 static int reboot_emergency;
47 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */
48 bool port_cf9_safe = false;
51 * Reboot options and system auto-detection code provided by
52 * Dell Inc. so their systems "just work". :-)
56 * Some machines require the "reboot=b" or "reboot=k" commandline options,
57 * this quirk makes that automatic.
59 static int __init set_bios_reboot(const struct dmi_system_id *d)
61 if (reboot_type != BOOT_BIOS) {
62 reboot_type = BOOT_BIOS;
63 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
69 void __noreturn machine_real_restart(unsigned int type)
74 * Write zero to CMOS register number 0x0f, which the BIOS POST
75 * routine will recognize as telling it to do a proper reboot. (Well
76 * that's what this book in front of me says -- it may only apply to
77 * the Phoenix BIOS though, it's not clear). At the same time,
78 * disable NMIs by setting the top bit in the CMOS address register,
79 * as we're about to do peculiar things to the CPU. I'm not sure if
80 * `outb_p' is needed instead of just `outb'. Use it to be on the
81 * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
84 CMOS_WRITE(0x00, 0x8f);
85 spin_unlock(&rtc_lock);
88 * Switch back to the initial page table.
91 load_cr3(initial_page_table);
93 write_cr3(real_mode_header->trampoline_pgd);
96 /* Jump to the identity-mapped low memory code */
98 asm volatile("jmpl *%0" : :
99 "rm" (real_mode_header->machine_real_restart_asm),
102 asm volatile("ljmpl *%0" : :
103 "m" (real_mode_header->machine_real_restart_asm),
108 #ifdef CONFIG_APM_MODULE
109 EXPORT_SYMBOL(machine_real_restart);
113 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
115 static int __init set_pci_reboot(const struct dmi_system_id *d)
117 if (reboot_type != BOOT_CF9) {
118 reboot_type = BOOT_CF9;
119 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
125 static int __init set_kbd_reboot(const struct dmi_system_id *d)
127 if (reboot_type != BOOT_KBD) {
128 reboot_type = BOOT_KBD;
129 pr_info("%s series board detected. Selecting %s-method for reboot.\n",
136 * This is a single dmi_table handling all reboot quirks.
138 static struct dmi_system_id __initdata reboot_dmi_table[] = {
141 { /* Handle reboot issue on Acer Aspire one */
142 .callback = set_kbd_reboot,
143 .ident = "Acer Aspire One A110",
145 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
146 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
151 { /* Handle problems with rebooting on Apple MacBook5 */
152 .callback = set_pci_reboot,
153 .ident = "Apple MacBook5",
155 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
156 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
159 { /* Handle problems with rebooting on Apple MacBookPro5 */
160 .callback = set_pci_reboot,
161 .ident = "Apple MacBookPro5",
163 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
164 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
167 { /* Handle problems with rebooting on Apple Macmini3,1 */
168 .callback = set_pci_reboot,
169 .ident = "Apple Macmini3,1",
171 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
172 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
175 { /* Handle problems with rebooting on the iMac9,1. */
176 .callback = set_pci_reboot,
177 .ident = "Apple iMac9,1",
179 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
180 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
185 { /* Handle problems with rebooting on ASUS P4S800 */
186 .callback = set_bios_reboot,
187 .ident = "ASUS P4S800",
189 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
190 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
195 { /* Handle problems with rebooting on Dell DXP061 */
196 .callback = set_bios_reboot,
197 .ident = "Dell DXP061",
199 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
200 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
203 { /* Handle problems with rebooting on Dell E520's */
204 .callback = set_bios_reboot,
205 .ident = "Dell E520",
207 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
208 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
211 { /* Handle problems with rebooting on the Latitude E5420. */
212 .callback = set_pci_reboot,
213 .ident = "Dell Latitude E5420",
215 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
216 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
219 { /* Handle problems with rebooting on the Latitude E6320. */
220 .callback = set_pci_reboot,
221 .ident = "Dell Latitude E6320",
223 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
224 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
227 { /* Handle problems with rebooting on the Latitude E6420. */
228 .callback = set_pci_reboot,
229 .ident = "Dell Latitude E6420",
231 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
232 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
235 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
236 .callback = set_bios_reboot,
237 .ident = "Dell OptiPlex 330",
239 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
240 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
241 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
244 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
245 .callback = set_bios_reboot,
246 .ident = "Dell OptiPlex 360",
248 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
249 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
250 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
253 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */
254 .callback = set_bios_reboot,
255 .ident = "Dell OptiPlex 745",
257 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
258 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
261 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */
262 .callback = set_bios_reboot,
263 .ident = "Dell OptiPlex 745",
265 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
266 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
267 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
270 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
271 .callback = set_bios_reboot,
272 .ident = "Dell OptiPlex 745",
274 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
275 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
276 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
279 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
280 .callback = set_bios_reboot,
281 .ident = "Dell OptiPlex 760",
283 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
284 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
285 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
288 { /* Handle problems with rebooting on the OptiPlex 990. */
289 .callback = set_pci_reboot,
290 .ident = "Dell OptiPlex 990",
292 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
293 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
296 { /* Handle problems with rebooting on Dell 300's */
297 .callback = set_bios_reboot,
298 .ident = "Dell PowerEdge 300",
300 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
301 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
304 { /* Handle problems with rebooting on Dell 1300's */
305 .callback = set_bios_reboot,
306 .ident = "Dell PowerEdge 1300",
308 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
309 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
312 { /* Handle problems with rebooting on Dell 2400's */
313 .callback = set_bios_reboot,
314 .ident = "Dell PowerEdge 2400",
316 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
317 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
320 { /* Handle problems with rebooting on the Dell PowerEdge C6100. */
321 .callback = set_pci_reboot,
322 .ident = "Dell PowerEdge C6100",
324 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
325 DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
328 { /* Handle problems with rebooting on the Precision M6600. */
329 .callback = set_pci_reboot,
330 .ident = "Dell Precision M6600",
332 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
333 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
336 { /* Handle problems with rebooting on Dell T5400's */
337 .callback = set_bios_reboot,
338 .ident = "Dell Precision T5400",
340 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
341 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
344 { /* Handle problems with rebooting on Dell T7400's */
345 .callback = set_bios_reboot,
346 .ident = "Dell Precision T7400",
348 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
349 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
352 { /* Handle problems with rebooting on Dell XPS710 */
353 .callback = set_bios_reboot,
354 .ident = "Dell XPS710",
356 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
357 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
361 /* Hewlett-Packard */
362 { /* Handle problems with rebooting on HP laptops */
363 .callback = set_bios_reboot,
364 .ident = "HP Compaq Laptop",
366 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
367 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
372 { /* Handle problems with rebooting on Sony VGN-Z540N */
373 .callback = set_bios_reboot,
374 .ident = "Sony VGN-Z540N",
376 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
377 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
384 static int __init reboot_init(void)
387 * Only do the DMI check if reboot_type hasn't been overridden
388 * on the command line
391 dmi_check_system(reboot_dmi_table);
394 core_initcall(reboot_init);
396 static inline void kb_wait(void)
400 for (i = 0; i < 0x10000; i++) {
401 if ((inb(0x64) & 0x02) == 0)
407 static void vmxoff_nmi(int cpu, struct pt_regs *regs)
409 cpu_emergency_vmxoff();
412 /* Use NMIs as IPIs to tell all CPUs to disable virtualization */
413 static void emergency_vmx_disable_all(void)
415 /* Just make sure we won't change CPUs while doing this */
419 * We need to disable VMX on all CPUs before rebooting, otherwise
420 * we risk hanging up the machine, because the CPU ignore INIT
421 * signals when VMX is enabled.
423 * We can't take any locks and we may be on an inconsistent
424 * state, so we use NMIs as IPIs to tell the other CPUs to disable
427 * For safety, we will avoid running the nmi_shootdown_cpus()
428 * stuff unnecessarily, but we don't have a way to check
429 * if other CPUs have VMX enabled. So we will call it only if the
430 * CPU we are running on has VMX enabled.
432 * We will miss cases where VMX is not enabled on all CPUs. This
433 * shouldn't do much harm because KVM always enable VMX on all
434 * CPUs anyway. But we can miss it on the small window where KVM
435 * is still enabling VMX.
437 if (cpu_has_vmx() && cpu_vmx_enabled()) {
438 /* Disable VMX on this CPU. */
441 /* Halt and disable VMX on the other CPUs */
442 nmi_shootdown_cpus(vmxoff_nmi);
448 void __attribute__((weak)) mach_reboot_fixups(void)
453 * Windows compatible x86 hardware expects the following on reboot:
455 * 1) If the FADT has the ACPI reboot register flag set, try it
456 * 2) If still alive, write to the keyboard controller
457 * 3) If still alive, write to the ACPI reboot register again
458 * 4) If still alive, write to the keyboard controller again
460 * If the machine is still alive at this stage, it gives up. We default to
461 * following the same pattern, except that if we're still alive after (4) we'll
462 * try to force a triple fault and then cycle between hitting the keyboard
463 * controller and doing that
465 static void native_machine_emergency_restart(void)
469 int orig_reboot_type = reboot_type;
472 if (reboot_emergency)
473 emergency_vmx_disable_all();
475 tboot_shutdown(TB_SHUTDOWN_REBOOT);
477 /* Tell the BIOS if we want cold or warm reboot */
478 mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
479 *((unsigned short *)__va(0x472)) = mode;
482 /* Could also try the reset bit in the Hammer NB */
483 switch (reboot_type) {
485 mach_reboot_fixups(); /* For board specific fixups */
487 for (i = 0; i < 10; i++) {
490 outb(0xfe, 0x64); /* Pulse reset low */
493 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
495 reboot_type = BOOT_ACPI;
497 reboot_type = BOOT_TRIPLE;
503 __asm__ __volatile__("int3");
505 reboot_type = BOOT_KBD;
509 machine_real_restart(MRR_BIOS);
511 reboot_type = BOOT_KBD;
516 reboot_type = BOOT_KBD;
520 if (efi_enabled(EFI_RUNTIME_SERVICES))
521 efi.reset_system(reboot_mode == REBOOT_WARM ?
524 EFI_SUCCESS, 0, NULL);
525 reboot_type = BOOT_KBD;
529 port_cf9_safe = true;
534 u8 reboot_code = reboot_mode == REBOOT_WARM ?
536 u8 cf9 = inb(0xcf9) & ~reboot_code;
537 outb(cf9|2, 0xcf9); /* Request hard reset */
539 /* Actually do the reset */
540 outb(cf9|reboot_code, 0xcf9);
543 reboot_type = BOOT_KBD;
549 void native_machine_shutdown(void)
551 /* Stop the cpus and apics */
554 * Stop all of the others. Also disable the local irq to
555 * not receive the per-cpu timer interrupt which may trigger
556 * scheduler's load balance.
564 #ifdef CONFIG_X86_IO_APIC
568 #ifdef CONFIG_HPET_TIMER
573 x86_platform.iommu_shutdown();
577 static void __machine_emergency_restart(int emergency)
579 reboot_emergency = emergency;
580 machine_ops.emergency_restart();
583 static void native_machine_restart(char *__unused)
585 pr_notice("machine restart\n");
589 __machine_emergency_restart(0);
592 static void native_machine_halt(void)
594 /* Stop other cpus and apics */
597 tboot_shutdown(TB_SHUTDOWN_HALT);
602 static void native_machine_power_off(void)
609 /* A fallback in case there is no PM info available */
610 tboot_shutdown(TB_SHUTDOWN_HALT);
613 struct machine_ops machine_ops = {
614 .power_off = native_machine_power_off,
615 .shutdown = native_machine_shutdown,
616 .emergency_restart = native_machine_emergency_restart,
617 .restart = native_machine_restart,
618 .halt = native_machine_halt,
620 .crash_shutdown = native_machine_crash_shutdown,
624 void machine_power_off(void)
626 machine_ops.power_off();
629 void machine_shutdown(void)
631 machine_ops.shutdown();
634 void machine_emergency_restart(void)
636 __machine_emergency_restart(1);
639 void machine_restart(char *cmd)
641 machine_ops.restart(cmd);
644 void machine_halt(void)
650 void machine_crash_shutdown(struct pt_regs *regs)
652 machine_ops.crash_shutdown(regs);
657 #if defined(CONFIG_SMP)
659 /* This keeps a track of which one is crashing cpu. */
660 static int crashing_cpu;
661 static nmi_shootdown_cb shootdown_callback;
663 static atomic_t waiting_for_crash_ipi;
665 static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
669 cpu = raw_smp_processor_id();
672 * Don't do anything if this handler is invoked on crashing cpu.
673 * Otherwise, system will completely hang. Crashing cpu can get
674 * an NMI if system was initially booted with nmi_watchdog parameter.
676 if (cpu == crashing_cpu)
680 shootdown_callback(cpu, regs);
682 atomic_dec(&waiting_for_crash_ipi);
683 /* Assume hlt works */
691 static void smp_send_nmi_allbutself(void)
693 apic->send_IPI_allbutself(NMI_VECTOR);
697 * Halt all other CPUs, calling the specified function on each of them
699 * This function can be used to halt all other CPUs on crash
700 * or emergency reboot time. The function passed as parameter
701 * will be called inside a NMI handler on all CPUs.
703 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
708 /* Make a note of crashing cpu. Will be used in NMI callback. */
709 crashing_cpu = safe_smp_processor_id();
711 shootdown_callback = callback;
713 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
714 /* Would it be better to replace the trap vector here? */
715 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
716 NMI_FLAG_FIRST, "crash"))
717 return; /* Return what? */
719 * Ensure the new callback function is set before sending
724 smp_send_nmi_allbutself();
726 msecs = 1000; /* Wait at most a second for the other cpus to stop */
727 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
732 /* Leave the nmi callback set */
734 #else /* !CONFIG_SMP */
735 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
737 /* No other CPUs to shoot down */