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[] = {
139 { /* Handle problems with rebooting on Dell E520's */
140 .callback = set_bios_reboot,
141 .ident = "Dell E520",
143 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
144 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
147 { /* Handle problems with rebooting on Dell 1300's */
148 .callback = set_bios_reboot,
149 .ident = "Dell PowerEdge 1300",
151 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
152 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
155 { /* Handle problems with rebooting on Dell 300's */
156 .callback = set_bios_reboot,
157 .ident = "Dell PowerEdge 300",
159 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
160 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
163 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */
164 .callback = set_bios_reboot,
165 .ident = "Dell OptiPlex 745",
167 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
168 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
171 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */
172 .callback = set_bios_reboot,
173 .ident = "Dell OptiPlex 745",
175 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
176 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
177 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
180 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
181 .callback = set_bios_reboot,
182 .ident = "Dell OptiPlex 745",
184 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
185 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
186 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
189 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
190 .callback = set_bios_reboot,
191 .ident = "Dell OptiPlex 330",
193 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
194 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
195 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
198 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
199 .callback = set_bios_reboot,
200 .ident = "Dell OptiPlex 360",
202 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
203 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
204 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
207 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
208 .callback = set_bios_reboot,
209 .ident = "Dell OptiPlex 760",
211 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
212 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
213 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
216 { /* Handle problems with rebooting on Dell 2400's */
217 .callback = set_bios_reboot,
218 .ident = "Dell PowerEdge 2400",
220 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
221 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
224 { /* Handle problems with rebooting on Dell T5400's */
225 .callback = set_bios_reboot,
226 .ident = "Dell Precision T5400",
228 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
229 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
232 { /* Handle problems with rebooting on Dell T7400's */
233 .callback = set_bios_reboot,
234 .ident = "Dell Precision T7400",
236 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
237 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
240 { /* Handle problems with rebooting on HP laptops */
241 .callback = set_bios_reboot,
242 .ident = "HP Compaq Laptop",
244 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
245 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
248 { /* Handle problems with rebooting on Dell XPS710 */
249 .callback = set_bios_reboot,
250 .ident = "Dell XPS710",
252 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
253 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
256 { /* Handle problems with rebooting on Dell DXP061 */
257 .callback = set_bios_reboot,
258 .ident = "Dell DXP061",
260 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
261 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
264 { /* Handle problems with rebooting on Sony VGN-Z540N */
265 .callback = set_bios_reboot,
266 .ident = "Sony VGN-Z540N",
268 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
269 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
272 { /* Handle problems with rebooting on ASUS P4S800 */
273 .callback = set_bios_reboot,
274 .ident = "ASUS P4S800",
276 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
277 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
281 { /* Handle reboot issue on Acer Aspire one */
282 .callback = set_kbd_reboot,
283 .ident = "Acer Aspire One A110",
285 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
286 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
289 { /* Handle problems with rebooting on Apple MacBook5 */
290 .callback = set_pci_reboot,
291 .ident = "Apple MacBook5",
293 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
294 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
297 { /* Handle problems with rebooting on Apple MacBookPro5 */
298 .callback = set_pci_reboot,
299 .ident = "Apple MacBookPro5",
301 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
302 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
305 { /* Handle problems with rebooting on Apple Macmini3,1 */
306 .callback = set_pci_reboot,
307 .ident = "Apple Macmini3,1",
309 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
310 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
313 { /* Handle problems with rebooting on the iMac9,1. */
314 .callback = set_pci_reboot,
315 .ident = "Apple iMac9,1",
317 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
318 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
321 { /* Handle problems with rebooting on the Latitude E6320. */
322 .callback = set_pci_reboot,
323 .ident = "Dell Latitude E6320",
325 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
326 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
329 { /* Handle problems with rebooting on the Latitude E5420. */
330 .callback = set_pci_reboot,
331 .ident = "Dell Latitude E5420",
333 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
334 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
337 { /* Handle problems with rebooting on the Latitude E6420. */
338 .callback = set_pci_reboot,
339 .ident = "Dell Latitude E6420",
341 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
342 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
345 { /* Handle problems with rebooting on the OptiPlex 990. */
346 .callback = set_pci_reboot,
347 .ident = "Dell OptiPlex 990",
349 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
350 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
353 { /* Handle problems with rebooting on the Precision M6600. */
354 .callback = set_pci_reboot,
355 .ident = "Dell Precision M6600",
357 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
358 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
361 { /* Handle problems with rebooting on the Dell PowerEdge C6100. */
362 .callback = set_pci_reboot,
363 .ident = "Dell PowerEdge C6100",
365 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
366 DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
369 { /* Some C6100 machines were shipped with vendor being 'Dell'. */
370 .callback = set_pci_reboot,
371 .ident = "Dell PowerEdge C6100",
373 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
374 DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
380 static int __init reboot_init(void)
383 * Only do the DMI check if reboot_type hasn't been overridden
384 * on the command line
387 dmi_check_system(reboot_dmi_table);
390 core_initcall(reboot_init);
392 static inline void kb_wait(void)
396 for (i = 0; i < 0x10000; i++) {
397 if ((inb(0x64) & 0x02) == 0)
403 static void vmxoff_nmi(int cpu, struct pt_regs *regs)
405 cpu_emergency_vmxoff();
408 /* Use NMIs as IPIs to tell all CPUs to disable virtualization */
409 static void emergency_vmx_disable_all(void)
411 /* Just make sure we won't change CPUs while doing this */
415 * We need to disable VMX on all CPUs before rebooting, otherwise
416 * we risk hanging up the machine, because the CPU ignore INIT
417 * signals when VMX is enabled.
419 * We can't take any locks and we may be on an inconsistent
420 * state, so we use NMIs as IPIs to tell the other CPUs to disable
423 * For safety, we will avoid running the nmi_shootdown_cpus()
424 * stuff unnecessarily, but we don't have a way to check
425 * if other CPUs have VMX enabled. So we will call it only if the
426 * CPU we are running on has VMX enabled.
428 * We will miss cases where VMX is not enabled on all CPUs. This
429 * shouldn't do much harm because KVM always enable VMX on all
430 * CPUs anyway. But we can miss it on the small window where KVM
431 * is still enabling VMX.
433 if (cpu_has_vmx() && cpu_vmx_enabled()) {
434 /* Disable VMX on this CPU. */
437 /* Halt and disable VMX on the other CPUs */
438 nmi_shootdown_cpus(vmxoff_nmi);
444 void __attribute__((weak)) mach_reboot_fixups(void)
449 * Windows compatible x86 hardware expects the following on reboot:
451 * 1) If the FADT has the ACPI reboot register flag set, try it
452 * 2) If still alive, write to the keyboard controller
453 * 3) If still alive, write to the ACPI reboot register again
454 * 4) If still alive, write to the keyboard controller again
456 * If the machine is still alive at this stage, it gives up. We default to
457 * following the same pattern, except that if we're still alive after (4) we'll
458 * try to force a triple fault and then cycle between hitting the keyboard
459 * controller and doing that
461 static void native_machine_emergency_restart(void)
465 int orig_reboot_type = reboot_type;
468 if (reboot_emergency)
469 emergency_vmx_disable_all();
471 tboot_shutdown(TB_SHUTDOWN_REBOOT);
473 /* Tell the BIOS if we want cold or warm reboot */
474 mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
475 *((unsigned short *)__va(0x472)) = mode;
478 /* Could also try the reset bit in the Hammer NB */
479 switch (reboot_type) {
481 mach_reboot_fixups(); /* For board specific fixups */
483 for (i = 0; i < 10; i++) {
486 outb(0xfe, 0x64); /* Pulse reset low */
489 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
491 reboot_type = BOOT_ACPI;
493 reboot_type = BOOT_TRIPLE;
499 __asm__ __volatile__("int3");
501 reboot_type = BOOT_KBD;
505 machine_real_restart(MRR_BIOS);
507 reboot_type = BOOT_KBD;
512 reboot_type = BOOT_KBD;
516 if (efi_enabled(EFI_RUNTIME_SERVICES))
517 efi.reset_system(reboot_mode == REBOOT_WARM ?
520 EFI_SUCCESS, 0, NULL);
521 reboot_type = BOOT_KBD;
525 port_cf9_safe = true;
530 u8 cf9 = inb(0xcf9) & ~6;
531 outb(cf9|2, 0xcf9); /* Request hard reset */
533 outb(cf9|6, 0xcf9); /* Actually do the reset */
536 reboot_type = BOOT_KBD;
542 void native_machine_shutdown(void)
544 /* Stop the cpus and apics */
547 * Stop all of the others. Also disable the local irq to
548 * not receive the per-cpu timer interrupt which may trigger
549 * scheduler's load balance.
557 #ifdef CONFIG_X86_IO_APIC
561 #ifdef CONFIG_HPET_TIMER
566 x86_platform.iommu_shutdown();
570 static void __machine_emergency_restart(int emergency)
572 reboot_emergency = emergency;
573 machine_ops.emergency_restart();
576 static void native_machine_restart(char *__unused)
578 pr_notice("machine restart\n");
582 __machine_emergency_restart(0);
585 static void native_machine_halt(void)
587 /* Stop other cpus and apics */
590 tboot_shutdown(TB_SHUTDOWN_HALT);
595 static void native_machine_power_off(void)
602 /* A fallback in case there is no PM info available */
603 tboot_shutdown(TB_SHUTDOWN_HALT);
606 struct machine_ops machine_ops = {
607 .power_off = native_machine_power_off,
608 .shutdown = native_machine_shutdown,
609 .emergency_restart = native_machine_emergency_restart,
610 .restart = native_machine_restart,
611 .halt = native_machine_halt,
613 .crash_shutdown = native_machine_crash_shutdown,
617 void machine_power_off(void)
619 machine_ops.power_off();
622 void machine_shutdown(void)
624 machine_ops.shutdown();
627 void machine_emergency_restart(void)
629 __machine_emergency_restart(1);
632 void machine_restart(char *cmd)
634 machine_ops.restart(cmd);
637 void machine_halt(void)
643 void machine_crash_shutdown(struct pt_regs *regs)
645 machine_ops.crash_shutdown(regs);
650 #if defined(CONFIG_SMP)
652 /* This keeps a track of which one is crashing cpu. */
653 static int crashing_cpu;
654 static nmi_shootdown_cb shootdown_callback;
656 static atomic_t waiting_for_crash_ipi;
658 static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
662 cpu = raw_smp_processor_id();
665 * Don't do anything if this handler is invoked on crashing cpu.
666 * Otherwise, system will completely hang. Crashing cpu can get
667 * an NMI if system was initially booted with nmi_watchdog parameter.
669 if (cpu == crashing_cpu)
673 shootdown_callback(cpu, regs);
675 atomic_dec(&waiting_for_crash_ipi);
676 /* Assume hlt works */
684 static void smp_send_nmi_allbutself(void)
686 apic->send_IPI_allbutself(NMI_VECTOR);
690 * Halt all other CPUs, calling the specified function on each of them
692 * This function can be used to halt all other CPUs on crash
693 * or emergency reboot time. The function passed as parameter
694 * will be called inside a NMI handler on all CPUs.
696 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
701 /* Make a note of crashing cpu. Will be used in NMI callback. */
702 crashing_cpu = safe_smp_processor_id();
704 shootdown_callback = callback;
706 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
707 /* Would it be better to replace the trap vector here? */
708 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
709 NMI_FLAG_FIRST, "crash"))
710 return; /* Return what? */
712 * Ensure the new callback function is set before sending
717 smp_send_nmi_allbutself();
719 msecs = 1000; /* Wait at most a second for the other cpus to stop */
720 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
725 /* Leave the nmi callback set */
727 #else /* !CONFIG_SMP */
728 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
730 /* No other CPUs to shoot down */