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>
27 # include <asm/realmode.h>
29 # 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
= {};
39 static int reboot_mode
;
40 enum reboot_type reboot_type
= BOOT_ACPI
;
44 * This variable is used privately to keep track of whether or not
45 * reboot_type is still set to its default value (i.e., reboot= hasn't
46 * been set on the command line). This is needed so that we can
47 * suppress DMI scanning for reboot quirks. Without it, it's
48 * impossible to override a faulty reboot quirk without recompiling.
50 static int reboot_default
= 1;
52 #if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
53 static int reboot_cpu
= -1;
57 * This is set if we need to go through the 'emergency' path.
58 * When machine_emergency_restart() is called, we may be on
59 * an inconsistent state and won't be able to do a clean cleanup
61 static int reboot_emergency
;
63 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */
64 bool port_cf9_safe
= false;
67 * reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
68 * warm Don't set the cold reboot flag
69 * cold Set the cold reboot flag
70 * bios Reboot by jumping through the BIOS (only for X86_32)
71 * smp Reboot by executing reset on BSP or other CPU (only for X86_32)
72 * triple Force a triple fault (init)
73 * kbd Use the keyboard controller. cold reset (default)
74 * acpi Use the RESET_REG in the FADT
75 * efi Use efi reset_system runtime service
76 * pci Use the so-called "PCI reset register", CF9
77 * force Avoid anything that could hang.
79 static int __init
reboot_setup(char *str
)
83 * Having anything passed on the command line via
84 * reboot= will cause us to disable DMI checking
101 if (isdigit(*(str
+1))) {
102 reboot_cpu
= (int) (*(str
+1) - '0');
103 if (isdigit(*(str
+2)))
104 reboot_cpu
= reboot_cpu
*10 + (int)(*(str
+2) - '0');
107 * We will leave sorting out the final value
108 * when we are ready to reboot, since we might not
109 * have detected BSP APIC ID or smp_num_cpu
112 #endif /* CONFIG_SMP */
129 str
= strchr(str
, ',');
138 __setup("reboot=", reboot_setup
);
143 * Reboot options and system auto-detection code provided by
144 * Dell Inc. so their systems "just work". :-)
148 * Some machines require the "reboot=b" or "reboot=k" commandline options,
149 * this quirk makes that automatic.
151 static int __init
set_bios_reboot(const struct dmi_system_id
*d
)
153 if (reboot_type
!= BOOT_BIOS
) {
154 reboot_type
= BOOT_BIOS
;
155 printk(KERN_INFO
"%s series board detected. Selecting BIOS-method for reboots.\n", d
->ident
);
160 void machine_real_restart(unsigned int type
)
162 void (*restart_lowmem
)(unsigned int) = (void (*)(unsigned int))
163 real_mode_header
->machine_real_restart_asm
;
168 * Write zero to CMOS register number 0x0f, which the BIOS POST
169 * routine will recognize as telling it to do a proper reboot. (Well
170 * that's what this book in front of me says -- it may only apply to
171 * the Phoenix BIOS though, it's not clear). At the same time,
172 * disable NMIs by setting the top bit in the CMOS address register,
173 * as we're about to do peculiar things to the CPU. I'm not sure if
174 * `outb_p' is needed instead of just `outb'. Use it to be on the
175 * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
177 spin_lock(&rtc_lock
);
178 CMOS_WRITE(0x00, 0x8f);
179 spin_unlock(&rtc_lock
);
182 * Switch back to the initial page table.
184 load_cr3(initial_page_table
);
187 * Write 0x1234 to absolute memory location 0x472. The BIOS reads
188 * this on booting to tell it to "Bypass memory test (also warm
189 * boot)". This seems like a fairly standard thing that gets set by
190 * REBOOT.COM programs, and the previous reset routine did this
192 *((unsigned short *)0x472) = reboot_mode
;
194 /* Jump to the identity-mapped low memory code */
195 restart_lowmem(type
);
197 #ifdef CONFIG_APM_MODULE
198 EXPORT_SYMBOL(machine_real_restart
);
201 #endif /* CONFIG_X86_32 */
204 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
206 static int __init
set_pci_reboot(const struct dmi_system_id
*d
)
208 if (reboot_type
!= BOOT_CF9
) {
209 reboot_type
= BOOT_CF9
;
210 printk(KERN_INFO
"%s series board detected. "
211 "Selecting PCI-method for reboots.\n", d
->ident
);
216 static int __init
set_kbd_reboot(const struct dmi_system_id
*d
)
218 if (reboot_type
!= BOOT_KBD
) {
219 reboot_type
= BOOT_KBD
;
220 printk(KERN_INFO
"%s series board detected. Selecting KBD-method for reboot.\n", d
->ident
);
226 * This is a single dmi_table handling all reboot quirks. Note that
227 * REBOOT_BIOS is only available for 32bit
229 static struct dmi_system_id __initdata reboot_dmi_table
[] = {
231 { /* Handle problems with rebooting on Dell E520's */
232 .callback
= set_bios_reboot
,
233 .ident
= "Dell E520",
235 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
236 DMI_MATCH(DMI_PRODUCT_NAME
, "Dell DM061"),
239 { /* Handle problems with rebooting on Dell 1300's */
240 .callback
= set_bios_reboot
,
241 .ident
= "Dell PowerEdge 1300",
243 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Computer Corporation"),
244 DMI_MATCH(DMI_PRODUCT_NAME
, "PowerEdge 1300/"),
247 { /* Handle problems with rebooting on Dell 300's */
248 .callback
= set_bios_reboot
,
249 .ident
= "Dell PowerEdge 300",
251 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Computer Corporation"),
252 DMI_MATCH(DMI_PRODUCT_NAME
, "PowerEdge 300/"),
255 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */
256 .callback
= set_bios_reboot
,
257 .ident
= "Dell OptiPlex 745",
259 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
260 DMI_MATCH(DMI_PRODUCT_NAME
, "OptiPlex 745"),
263 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */
264 .callback
= set_bios_reboot
,
265 .ident
= "Dell OptiPlex 745",
267 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
268 DMI_MATCH(DMI_PRODUCT_NAME
, "OptiPlex 745"),
269 DMI_MATCH(DMI_BOARD_NAME
, "0MM599"),
272 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
273 .callback
= set_bios_reboot
,
274 .ident
= "Dell OptiPlex 745",
276 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
277 DMI_MATCH(DMI_PRODUCT_NAME
, "OptiPlex 745"),
278 DMI_MATCH(DMI_BOARD_NAME
, "0KW626"),
281 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
282 .callback
= set_bios_reboot
,
283 .ident
= "Dell OptiPlex 330",
285 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
286 DMI_MATCH(DMI_PRODUCT_NAME
, "OptiPlex 330"),
287 DMI_MATCH(DMI_BOARD_NAME
, "0KP561"),
290 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
291 .callback
= set_bios_reboot
,
292 .ident
= "Dell OptiPlex 360",
294 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
295 DMI_MATCH(DMI_PRODUCT_NAME
, "OptiPlex 360"),
296 DMI_MATCH(DMI_BOARD_NAME
, "0T656F"),
299 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
300 .callback
= set_bios_reboot
,
301 .ident
= "Dell OptiPlex 760",
303 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
304 DMI_MATCH(DMI_PRODUCT_NAME
, "OptiPlex 760"),
305 DMI_MATCH(DMI_BOARD_NAME
, "0G919G"),
308 { /* Handle problems with rebooting on Dell 2400's */
309 .callback
= set_bios_reboot
,
310 .ident
= "Dell PowerEdge 2400",
312 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Computer Corporation"),
313 DMI_MATCH(DMI_PRODUCT_NAME
, "PowerEdge 2400"),
316 { /* Handle problems with rebooting on Dell T5400's */
317 .callback
= set_bios_reboot
,
318 .ident
= "Dell Precision T5400",
320 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
321 DMI_MATCH(DMI_PRODUCT_NAME
, "Precision WorkStation T5400"),
324 { /* Handle problems with rebooting on Dell T7400's */
325 .callback
= set_bios_reboot
,
326 .ident
= "Dell Precision T7400",
328 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
329 DMI_MATCH(DMI_PRODUCT_NAME
, "Precision WorkStation T7400"),
332 { /* Handle problems with rebooting on HP laptops */
333 .callback
= set_bios_reboot
,
334 .ident
= "HP Compaq Laptop",
336 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
337 DMI_MATCH(DMI_PRODUCT_NAME
, "HP Compaq"),
340 { /* Handle problems with rebooting on Dell XPS710 */
341 .callback
= set_bios_reboot
,
342 .ident
= "Dell XPS710",
344 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
345 DMI_MATCH(DMI_PRODUCT_NAME
, "Dell XPS710"),
348 { /* Handle problems with rebooting on Dell DXP061 */
349 .callback
= set_bios_reboot
,
350 .ident
= "Dell DXP061",
352 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
353 DMI_MATCH(DMI_PRODUCT_NAME
, "Dell DXP061"),
356 { /* Handle problems with rebooting on Sony VGN-Z540N */
357 .callback
= set_bios_reboot
,
358 .ident
= "Sony VGN-Z540N",
360 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
361 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-Z540N"),
364 { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */
365 .callback
= set_bios_reboot
,
366 .ident
= "CompuLab SBC-FITPC2",
368 DMI_MATCH(DMI_SYS_VENDOR
, "CompuLab"),
369 DMI_MATCH(DMI_PRODUCT_NAME
, "SBC-FITPC2"),
372 { /* Handle problems with rebooting on ASUS P4S800 */
373 .callback
= set_bios_reboot
,
374 .ident
= "ASUS P4S800",
376 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
377 DMI_MATCH(DMI_BOARD_NAME
, "P4S800"),
380 #endif /* CONFIG_X86_32 */
382 { /* Handle reboot issue on Acer Aspire one */
383 .callback
= set_kbd_reboot
,
384 .ident
= "Acer Aspire One A110",
386 DMI_MATCH(DMI_SYS_VENDOR
, "Acer"),
387 DMI_MATCH(DMI_PRODUCT_NAME
, "AOA110"),
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"),
430 { /* Handle problems with rebooting on the Latitude E5420. */
431 .callback
= set_pci_reboot
,
432 .ident
= "Dell Latitude E5420",
434 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
435 DMI_MATCH(DMI_PRODUCT_NAME
, "Latitude E5420"),
438 { /* Handle problems with rebooting on the Latitude E6420. */
439 .callback
= set_pci_reboot
,
440 .ident
= "Dell Latitude E6420",
442 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
443 DMI_MATCH(DMI_PRODUCT_NAME
, "Latitude E6420"),
446 { /* Handle problems with rebooting on the OptiPlex 990. */
447 .callback
= set_pci_reboot
,
448 .ident
= "Dell OptiPlex 990",
450 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
451 DMI_MATCH(DMI_PRODUCT_NAME
, "OptiPlex 990"),
454 { /* Handle problems with rebooting on the Precision M6600. */
455 .callback
= set_pci_reboot
,
456 .ident
= "Dell OptiPlex 990",
458 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
459 DMI_MATCH(DMI_PRODUCT_NAME
, "Precision M6600"),
465 static int __init
reboot_init(void)
468 * Only do the DMI check if reboot_type hasn't been overridden
469 * on the command line
472 dmi_check_system(reboot_dmi_table
);
475 core_initcall(reboot_init
);
477 static inline void kb_wait(void)
481 for (i
= 0; i
< 0x10000; i
++) {
482 if ((inb(0x64) & 0x02) == 0)
488 static void vmxoff_nmi(int cpu
, struct pt_regs
*regs
)
490 cpu_emergency_vmxoff();
493 /* Use NMIs as IPIs to tell all CPUs to disable virtualization */
494 static void emergency_vmx_disable_all(void)
496 /* Just make sure we won't change CPUs while doing this */
500 * We need to disable VMX on all CPUs before rebooting, otherwise
501 * we risk hanging up the machine, because the CPU ignore INIT
502 * signals when VMX is enabled.
504 * We can't take any locks and we may be on an inconsistent
505 * state, so we use NMIs as IPIs to tell the other CPUs to disable
508 * For safety, we will avoid running the nmi_shootdown_cpus()
509 * stuff unnecessarily, but we don't have a way to check
510 * if other CPUs have VMX enabled. So we will call it only if the
511 * CPU we are running on has VMX enabled.
513 * We will miss cases where VMX is not enabled on all CPUs. This
514 * shouldn't do much harm because KVM always enable VMX on all
515 * CPUs anyway. But we can miss it on the small window where KVM
516 * is still enabling VMX.
518 if (cpu_has_vmx() && cpu_vmx_enabled()) {
519 /* Disable VMX on this CPU. */
522 /* Halt and disable VMX on the other CPUs */
523 nmi_shootdown_cpus(vmxoff_nmi
);
529 void __attribute__((weak
)) mach_reboot_fixups(void)
534 * Windows compatible x86 hardware expects the following on reboot:
536 * 1) If the FADT has the ACPI reboot register flag set, try it
537 * 2) If still alive, write to the keyboard controller
538 * 3) If still alive, write to the ACPI reboot register again
539 * 4) If still alive, write to the keyboard controller again
541 * If the machine is still alive at this stage, it gives up. We default to
542 * following the same pattern, except that if we're still alive after (4) we'll
543 * try to force a triple fault and then cycle between hitting the keyboard
544 * controller and doing that
546 static void native_machine_emergency_restart(void)
550 int orig_reboot_type
= reboot_type
;
552 if (reboot_emergency
)
553 emergency_vmx_disable_all();
555 tboot_shutdown(TB_SHUTDOWN_REBOOT
);
557 /* Tell the BIOS if we want cold or warm reboot */
558 *((unsigned short *)__va(0x472)) = reboot_mode
;
561 /* Could also try the reset bit in the Hammer NB */
562 switch (reboot_type
) {
564 mach_reboot_fixups(); /* For board specific fixups */
566 for (i
= 0; i
< 10; i
++) {
569 outb(0xfe, 0x64); /* Pulse reset low */
572 if (attempt
== 0 && orig_reboot_type
== BOOT_ACPI
) {
574 reboot_type
= BOOT_ACPI
;
576 reboot_type
= BOOT_TRIPLE
;
582 __asm__
__volatile__("int3");
584 reboot_type
= BOOT_KBD
;
589 machine_real_restart(MRR_BIOS
);
591 reboot_type
= BOOT_KBD
;
597 reboot_type
= BOOT_KBD
;
602 efi
.reset_system(reboot_mode
?
605 EFI_SUCCESS
, 0, NULL
);
606 reboot_type
= BOOT_KBD
;
610 port_cf9_safe
= true;
615 u8 cf9
= inb(0xcf9) & ~6;
616 outb(cf9
|2, 0xcf9); /* Request hard reset */
618 outb(cf9
|6, 0xcf9); /* Actually do the reset */
621 reboot_type
= BOOT_KBD
;
627 void native_machine_shutdown(void)
629 /* Stop the cpus and apics */
632 /* The boot cpu is always logical cpu 0 */
633 int reboot_cpu_id
= 0;
636 /* See if there has been given a command line override */
637 if ((reboot_cpu
!= -1) && (reboot_cpu
< nr_cpu_ids
) &&
638 cpu_online(reboot_cpu
))
639 reboot_cpu_id
= reboot_cpu
;
642 /* Make certain the cpu I'm about to reboot on is online */
643 if (!cpu_online(reboot_cpu_id
))
644 reboot_cpu_id
= smp_processor_id();
646 /* Make certain I only run on the appropriate processor */
647 set_cpus_allowed_ptr(current
, cpumask_of(reboot_cpu_id
));
650 * O.K Now that I'm on the appropriate processor,
651 * stop all of the others.
658 #ifdef CONFIG_X86_IO_APIC
662 #ifdef CONFIG_HPET_TIMER
667 x86_platform
.iommu_shutdown();
671 static void __machine_emergency_restart(int emergency
)
673 reboot_emergency
= emergency
;
674 machine_ops
.emergency_restart();
677 static void native_machine_restart(char *__unused
)
679 printk("machine restart\n");
683 __machine_emergency_restart(0);
686 static void native_machine_halt(void)
688 /* Stop other cpus and apics */
691 tboot_shutdown(TB_SHUTDOWN_HALT
);
696 static void native_machine_power_off(void)
703 /* A fallback in case there is no PM info available */
704 tboot_shutdown(TB_SHUTDOWN_HALT
);
707 struct machine_ops machine_ops
= {
708 .power_off
= native_machine_power_off
,
709 .shutdown
= native_machine_shutdown
,
710 .emergency_restart
= native_machine_emergency_restart
,
711 .restart
= native_machine_restart
,
712 .halt
= native_machine_halt
,
714 .crash_shutdown
= native_machine_crash_shutdown
,
718 void machine_power_off(void)
720 machine_ops
.power_off();
723 void machine_shutdown(void)
725 machine_ops
.shutdown();
728 void machine_emergency_restart(void)
730 __machine_emergency_restart(1);
733 void machine_restart(char *cmd
)
735 machine_ops
.restart(cmd
);
738 void machine_halt(void)
744 void machine_crash_shutdown(struct pt_regs
*regs
)
746 machine_ops
.crash_shutdown(regs
);
751 #if defined(CONFIG_SMP)
753 /* This keeps a track of which one is crashing cpu. */
754 static int crashing_cpu
;
755 static nmi_shootdown_cb shootdown_callback
;
757 static atomic_t waiting_for_crash_ipi
;
759 static int crash_nmi_callback(unsigned int val
, struct pt_regs
*regs
)
763 cpu
= raw_smp_processor_id();
766 * Don't do anything if this handler is invoked on crashing cpu.
767 * Otherwise, system will completely hang. Crashing cpu can get
768 * an NMI if system was initially booted with nmi_watchdog parameter.
770 if (cpu
== crashing_cpu
)
774 shootdown_callback(cpu
, regs
);
776 atomic_dec(&waiting_for_crash_ipi
);
777 /* Assume hlt works */
785 static void smp_send_nmi_allbutself(void)
787 apic
->send_IPI_allbutself(NMI_VECTOR
);
791 * Halt all other CPUs, calling the specified function on each of them
793 * This function can be used to halt all other CPUs on crash
794 * or emergency reboot time. The function passed as parameter
795 * will be called inside a NMI handler on all CPUs.
797 void nmi_shootdown_cpus(nmi_shootdown_cb callback
)
802 /* Make a note of crashing cpu. Will be used in NMI callback. */
803 crashing_cpu
= safe_smp_processor_id();
805 shootdown_callback
= callback
;
807 atomic_set(&waiting_for_crash_ipi
, num_online_cpus() - 1);
808 /* Would it be better to replace the trap vector here? */
809 if (register_nmi_handler(NMI_LOCAL
, crash_nmi_callback
,
810 NMI_FLAG_FIRST
, "crash"))
811 return; /* Return what? */
813 * Ensure the new callback function is set before sending
818 smp_send_nmi_allbutself();
820 msecs
= 1000; /* Wait at most a second for the other cpus to stop */
821 while ((atomic_read(&waiting_for_crash_ipi
) > 0) && msecs
) {
826 /* Leave the nmi callback set */
828 #else /* !CONFIG_SMP */
829 void nmi_shootdown_cpus(nmi_shootdown_cb callback
)
831 /* No other CPUs to shoot down */