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1#include <linux/module.h>
2#include <linux/reboot.h>
3#include <linux/init.h>
4#include <linux/pm.h>
5#include <linux/efi.h>
6#include <linux/dmi.h>
7#include <linux/sched.h>
8#include <linux/tboot.h>
9#include <linux/delay.h>
10#include <acpi/reboot.h>
11#include <asm/io.h>
12#include <asm/apic.h>
13#include <asm/desc.h>
14#include <asm/hpet.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>
21#include <asm/cpu.h>
22#include <asm/nmi.h>
23
24#ifdef CONFIG_X86_32
25# include <linux/ctype.h>
26# include <linux/mc146818rtc.h>
27#else
28# include <asm/x86_init.h>
29#endif
30
31/*
32 * Power off function, if any
33 */
34void (*pm_power_off)(void);
35EXPORT_SYMBOL(pm_power_off);
36
37static const struct desc_ptr no_idt = {};
38static int reboot_mode;
39enum reboot_type reboot_type = BOOT_ACPI;
40int reboot_force;
41
42#if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
43static int reboot_cpu = -1;
44#endif
45
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
49 */
50static int reboot_emergency;
51
52/* This is set by the PCI code if either type 1 or type 2 PCI is detected */
53bool port_cf9_safe = false;
54
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.
66 */
67static int __init reboot_setup(char *str)
68{
69 for (;;) {
70 switch (*str) {
71 case 'w':
72 reboot_mode = 0x1234;
73 break;
74
75 case 'c':
76 reboot_mode = 0;
77 break;
78
79#ifdef CONFIG_X86_32
80#ifdef CONFIG_SMP
81 case 's':
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');
86 }
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 */
90 break;
91#endif /* CONFIG_SMP */
92
93 case 'b':
94#endif
95 case 'a':
96 case 'k':
97 case 't':
98 case 'e':
99 case 'p':
100 reboot_type = *str;
101 break;
102
103 case 'f':
104 reboot_force = 1;
105 break;
106 }
107
108 str = strchr(str, ',');
109 if (str)
110 str++;
111 else
112 break;
113 }
114 return 1;
115}
116
117__setup("reboot=", reboot_setup);
118
119
120#ifdef CONFIG_X86_32
121/*
122 * Reboot options and system auto-detection code provided by
123 * Dell Inc. so their systems "just work". :-)
124 */
125
126/*
127 * Some machines require the "reboot=b" commandline option,
128 * this quirk makes that automatic.
129 */
130static int __init set_bios_reboot(const struct dmi_system_id *d)
131{
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);
135 }
136 return 0;
137}
138
139static 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",
143 .matches = {
144 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
145 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
146 },
147 },
148 { /* Handle problems with rebooting on Dell 1300's */
149 .callback = set_bios_reboot,
150 .ident = "Dell PowerEdge 1300",
151 .matches = {
152 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
153 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
154 },
155 },
156 { /* Handle problems with rebooting on Dell 300's */
157 .callback = set_bios_reboot,
158 .ident = "Dell PowerEdge 300",
159 .matches = {
160 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
161 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
162 },
163 },
164 { /* Handle problems with rebooting on Dell Optiplex 745's SFF*/
165 .callback = set_bios_reboot,
166 .ident = "Dell OptiPlex 745",
167 .matches = {
168 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
169 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
170 },
171 },
172 { /* Handle problems with rebooting on Dell Optiplex 745's DFF*/
173 .callback = set_bios_reboot,
174 .ident = "Dell OptiPlex 745",
175 .matches = {
176 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
177 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
178 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
179 },
180 },
181 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
182 .callback = set_bios_reboot,
183 .ident = "Dell OptiPlex 745",
184 .matches = {
185 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
186 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
187 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
188 },
189 },
190 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
191 .callback = set_bios_reboot,
192 .ident = "Dell OptiPlex 330",
193 .matches = {
194 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
195 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
196 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
197 },
198 },
199 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
200 .callback = set_bios_reboot,
201 .ident = "Dell OptiPlex 360",
202 .matches = {
203 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
204 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
205 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
206 },
207 },
208 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G*/
209 .callback = set_bios_reboot,
210 .ident = "Dell OptiPlex 760",
211 .matches = {
212 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
213 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
214 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
215 },
216 },
217 { /* Handle problems with rebooting on Dell 2400's */
218 .callback = set_bios_reboot,
219 .ident = "Dell PowerEdge 2400",
220 .matches = {
221 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
222 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
223 },
224 },
225 { /* Handle problems with rebooting on Dell T5400's */
226 .callback = set_bios_reboot,
227 .ident = "Dell Precision T5400",
228 .matches = {
229 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
230 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
231 },
232 },
233 { /* Handle problems with rebooting on Dell T7400's */
234 .callback = set_bios_reboot,
235 .ident = "Dell Precision T7400",
236 .matches = {
237 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
238 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
239 },
240 },
241 { /* Handle problems with rebooting on HP laptops */
242 .callback = set_bios_reboot,
243 .ident = "HP Compaq Laptop",
244 .matches = {
245 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
246 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
247 },
248 },
249 { /* Handle problems with rebooting on Dell XPS710 */
250 .callback = set_bios_reboot,
251 .ident = "Dell XPS710",
252 .matches = {
253 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
254 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
255 },
256 },
257 { /* Handle problems with rebooting on Dell DXP061 */
258 .callback = set_bios_reboot,
259 .ident = "Dell DXP061",
260 .matches = {
261 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
262 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
263 },
264 },
265 { /* Handle problems with rebooting on Sony VGN-Z540N */
266 .callback = set_bios_reboot,
267 .ident = "Sony VGN-Z540N",
268 .matches = {
269 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
270 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
271 },
272 },
273 { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */
274 .callback = set_bios_reboot,
275 .ident = "CompuLab SBC-FITPC2",
276 .matches = {
277 DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"),
278 DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"),
279 },
280 },
281 { /* Handle problems with rebooting on ASUS P4S800 */
282 .callback = set_bios_reboot,
283 .ident = "ASUS P4S800",
284 .matches = {
285 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
286 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
287 },
288 },
289 { /* Handle problems with rebooting on VersaLogic Menlow boards */
290 .callback = set_bios_reboot,
291 .ident = "VersaLogic Menlow based board",
292 .matches = {
293 DMI_MATCH(DMI_BOARD_VENDOR, "VersaLogic Corporation"),
294 DMI_MATCH(DMI_BOARD_NAME, "VersaLogic Menlow board"),
295 },
296 },
297 { /* Handle reboot issue on Acer Aspire one */
298 .callback = set_bios_reboot,
299 .ident = "Acer Aspire One A110",
300 .matches = {
301 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
302 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
303 },
304 },
305 { }
306};
307
308static int __init reboot_init(void)
309{
310 dmi_check_system(reboot_dmi_table);
311 return 0;
312}
313core_initcall(reboot_init);
314
315extern const unsigned char machine_real_restart_asm[];
316extern const u64 machine_real_restart_gdt[3];
317
318void machine_real_restart(unsigned int type)
319{
320 void *restart_va;
321 unsigned long restart_pa;
322 void (*restart_lowmem)(unsigned int);
323 u64 *lowmem_gdt;
324
325 local_irq_disable();
326
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.)
335 */
336 spin_lock(&rtc_lock);
337 CMOS_WRITE(0x00, 0x8f);
338 spin_unlock(&rtc_lock);
339
340 /*
341 * Switch back to the initial page table.
342 */
343 load_cr3(initial_page_table);
344
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
349 too. */
350 *((unsigned short *)0x472) = reboot_mode;
351
352 /* Patch the GDT in the low memory trampoline */
353 lowmem_gdt = TRAMPOLINE_SYM(machine_real_restart_gdt);
354
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;
358
359 /* GDT[0]: GDT self-pointer */
360 lowmem_gdt[0] =
361 (u64)(sizeof(machine_real_restart_gdt) - 1) +
362 ((u64)virt_to_phys(lowmem_gdt) << 16);
363 /* GDT[1]: 64K real mode code segment */
364 lowmem_gdt[1] =
365 GDT_ENTRY(0x009b, restart_pa, 0xffff);
366
367 /* Jump to the identity-mapped low memory code */
368 restart_lowmem(type);
369}
370#ifdef CONFIG_APM_MODULE
371EXPORT_SYMBOL(machine_real_restart);
372#endif
373
374#endif /* CONFIG_X86_32 */
375
376/*
377 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
378 */
379static int __init set_pci_reboot(const struct dmi_system_id *d)
380{
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);
385 }
386 return 0;
387}
388
389static 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",
393 .matches = {
394 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
395 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
396 },
397 },
398 { /* Handle problems with rebooting on Apple MacBookPro5 */
399 .callback = set_pci_reboot,
400 .ident = "Apple MacBookPro5",
401 .matches = {
402 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
403 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
404 },
405 },
406 { /* Handle problems with rebooting on Apple Macmini3,1 */
407 .callback = set_pci_reboot,
408 .ident = "Apple Macmini3,1",
409 .matches = {
410 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
411 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
412 },
413 },
414 { /* Handle problems with rebooting on the iMac9,1. */
415 .callback = set_pci_reboot,
416 .ident = "Apple iMac9,1",
417 .matches = {
418 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
419 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
420 },
421 },
422 { /* Handle problems with rebooting on the Latitude E6320. */
423 .callback = set_pci_reboot,
424 .ident = "Dell Latitude E6320",
425 .matches = {
426 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
427 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
428 },
429 },
430 { /* Handle problems with rebooting on the Latitude E5420. */
431 .callback = set_pci_reboot,
432 .ident = "Dell Latitude E5420",
433 .matches = {
434 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
435 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
436 },
437 },
438 { /* Handle problems with rebooting on the Latitude E6420. */
439 .callback = set_pci_reboot,
440 .ident = "Dell Latitude E6420",
441 .matches = {
442 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
443 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
444 },
445 },
446 { }
447};
448
449static int __init pci_reboot_init(void)
450{
451 dmi_check_system(pci_reboot_dmi_table);
452 return 0;
453}
454core_initcall(pci_reboot_init);
455
456static inline void kb_wait(void)
457{
458 int i;
459
460 for (i = 0; i < 0x10000; i++) {
461 if ((inb(0x64) & 0x02) == 0)
462 break;
463 udelay(2);
464 }
465}
466
467static void vmxoff_nmi(int cpu, struct die_args *args)
468{
469 cpu_emergency_vmxoff();
470}
471
472/* Use NMIs as IPIs to tell all CPUs to disable virtualization
473 */
474static void emergency_vmx_disable_all(void)
475{
476 /* Just make sure we won't change CPUs while doing this */
477 local_irq_disable();
478
479 /* We need to disable VMX on all CPUs before rebooting, otherwise
480 * we risk hanging up the machine, because the CPU ignore INIT
481 * signals when VMX is enabled.
482 *
483 * We can't take any locks and we may be on an inconsistent
484 * state, so we use NMIs as IPIs to tell the other CPUs to disable
485 * VMX and halt.
486 *
487 * For safety, we will avoid running the nmi_shootdown_cpus()
488 * stuff unnecessarily, but we don't have a way to check
489 * if other CPUs have VMX enabled. So we will call it only if the
490 * CPU we are running on has VMX enabled.
491 *
492 * We will miss cases where VMX is not enabled on all CPUs. This
493 * shouldn't do much harm because KVM always enable VMX on all
494 * CPUs anyway. But we can miss it on the small window where KVM
495 * is still enabling VMX.
496 */
497 if (cpu_has_vmx() && cpu_vmx_enabled()) {
498 /* Disable VMX on this CPU.
499 */
500 cpu_vmxoff();
501
502 /* Halt and disable VMX on the other CPUs */
503 nmi_shootdown_cpus(vmxoff_nmi);
504
505 }
506}
507
508
509void __attribute__((weak)) mach_reboot_fixups(void)
510{
511}
512
513/*
514 * Windows compatible x86 hardware expects the following on reboot:
515 *
516 * 1) If the FADT has the ACPI reboot register flag set, try it
517 * 2) If still alive, write to the keyboard controller
518 * 3) If still alive, write to the ACPI reboot register again
519 * 4) If still alive, write to the keyboard controller again
520 *
521 * If the machine is still alive at this stage, it gives up. We default to
522 * following the same pattern, except that if we're still alive after (4) we'll
523 * try to force a triple fault and then cycle between hitting the keyboard
524 * controller and doing that
525 */
526static void native_machine_emergency_restart(void)
527{
528 int i;
529 int attempt = 0;
530 int orig_reboot_type = reboot_type;
531
532 if (reboot_emergency)
533 emergency_vmx_disable_all();
534
535 tboot_shutdown(TB_SHUTDOWN_REBOOT);
536
537 /* Tell the BIOS if we want cold or warm reboot */
538 *((unsigned short *)__va(0x472)) = reboot_mode;
539
540 for (;;) {
541 /* Could also try the reset bit in the Hammer NB */
542 switch (reboot_type) {
543 case BOOT_KBD:
544 mach_reboot_fixups(); /* for board specific fixups */
545
546 for (i = 0; i < 10; i++) {
547 kb_wait();
548 udelay(50);
549 outb(0xfe, 0x64); /* pulse reset low */
550 udelay(50);
551 }
552 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
553 attempt = 1;
554 reboot_type = BOOT_ACPI;
555 } else {
556 reboot_type = BOOT_TRIPLE;
557 }
558 break;
559
560 case BOOT_TRIPLE:
561 load_idt(&no_idt);
562 __asm__ __volatile__("int3");
563
564 reboot_type = BOOT_KBD;
565 break;
566
567#ifdef CONFIG_X86_32
568 case BOOT_BIOS:
569 machine_real_restart(MRR_BIOS);
570
571 reboot_type = BOOT_KBD;
572 break;
573#endif
574
575 case BOOT_ACPI:
576 acpi_reboot();
577 reboot_type = BOOT_KBD;
578 break;
579
580 case BOOT_EFI:
581 if (efi_enabled)
582 efi.reset_system(reboot_mode ?
583 EFI_RESET_WARM :
584 EFI_RESET_COLD,
585 EFI_SUCCESS, 0, NULL);
586 reboot_type = BOOT_KBD;
587 break;
588
589 case BOOT_CF9:
590 port_cf9_safe = true;
591 /* fall through */
592
593 case BOOT_CF9_COND:
594 if (port_cf9_safe) {
595 u8 cf9 = inb(0xcf9) & ~6;
596 outb(cf9|2, 0xcf9); /* Request hard reset */
597 udelay(50);
598 outb(cf9|6, 0xcf9); /* Actually do the reset */
599 udelay(50);
600 }
601 reboot_type = BOOT_KBD;
602 break;
603 }
604 }
605}
606
607void native_machine_shutdown(void)
608{
609 /* Stop the cpus and apics */
610#ifdef CONFIG_SMP
611
612 /* The boot cpu is always logical cpu 0 */
613 int reboot_cpu_id = 0;
614
615#ifdef CONFIG_X86_32
616 /* See if there has been given a command line override */
617 if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
618 cpu_online(reboot_cpu))
619 reboot_cpu_id = reboot_cpu;
620#endif
621
622 /* Make certain the cpu I'm about to reboot on is online */
623 if (!cpu_online(reboot_cpu_id))
624 reboot_cpu_id = smp_processor_id();
625
626 /* Make certain I only run on the appropriate processor */
627 set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
628
629 /* O.K Now that I'm on the appropriate processor,
630 * stop all of the others.
631 */
632 stop_other_cpus();
633#endif
634
635 lapic_shutdown();
636
637#ifdef CONFIG_X86_IO_APIC
638 disable_IO_APIC();
639#endif
640
641#ifdef CONFIG_HPET_TIMER
642 hpet_disable();
643#endif
644
645#ifdef CONFIG_X86_64
646 x86_platform.iommu_shutdown();
647#endif
648}
649
650static void __machine_emergency_restart(int emergency)
651{
652 reboot_emergency = emergency;
653 machine_ops.emergency_restart();
654}
655
656static void native_machine_restart(char *__unused)
657{
658 printk("machine restart\n");
659
660 if (!reboot_force)
661 machine_shutdown();
662 __machine_emergency_restart(0);
663}
664
665static void native_machine_halt(void)
666{
667 /* stop other cpus and apics */
668 machine_shutdown();
669
670 tboot_shutdown(TB_SHUTDOWN_HALT);
671
672 /* stop this cpu */
673 stop_this_cpu(NULL);
674}
675
676static void native_machine_power_off(void)
677{
678 if (pm_power_off) {
679 if (!reboot_force)
680 machine_shutdown();
681 pm_power_off();
682 }
683 /* a fallback in case there is no PM info available */
684 tboot_shutdown(TB_SHUTDOWN_HALT);
685}
686
687struct machine_ops machine_ops = {
688 .power_off = native_machine_power_off,
689 .shutdown = native_machine_shutdown,
690 .emergency_restart = native_machine_emergency_restart,
691 .restart = native_machine_restart,
692 .halt = native_machine_halt,
693#ifdef CONFIG_KEXEC
694 .crash_shutdown = native_machine_crash_shutdown,
695#endif
696};
697
698void machine_power_off(void)
699{
700 machine_ops.power_off();
701}
702
703void machine_shutdown(void)
704{
705 machine_ops.shutdown();
706}
707
708void machine_emergency_restart(void)
709{
710 __machine_emergency_restart(1);
711}
712
713void machine_restart(char *cmd)
714{
715 machine_ops.restart(cmd);
716}
717
718void machine_halt(void)
719{
720 machine_ops.halt();
721}
722
723#ifdef CONFIG_KEXEC
724void machine_crash_shutdown(struct pt_regs *regs)
725{
726 machine_ops.crash_shutdown(regs);
727}
728#endif
729
730
731#if defined(CONFIG_SMP)
732
733/* This keeps a track of which one is crashing cpu. */
734static int crashing_cpu;
735static nmi_shootdown_cb shootdown_callback;
736
737static atomic_t waiting_for_crash_ipi;
738
739static int crash_nmi_callback(struct notifier_block *self,
740 unsigned long val, void *data)
741{
742 int cpu;
743
744 if (val != DIE_NMI)
745 return NOTIFY_OK;
746
747 cpu = raw_smp_processor_id();
748
749 /* Don't do anything if this handler is invoked on crashing cpu.
750 * Otherwise, system will completely hang. Crashing cpu can get
751 * an NMI if system was initially booted with nmi_watchdog parameter.
752 */
753 if (cpu == crashing_cpu)
754 return NOTIFY_STOP;
755 local_irq_disable();
756
757 shootdown_callback(cpu, (struct die_args *)data);
758
759 atomic_dec(&waiting_for_crash_ipi);
760 /* Assume hlt works */
761 halt();
762 for (;;)
763 cpu_relax();
764
765 return 1;
766}
767
768static void smp_send_nmi_allbutself(void)
769{
770 apic->send_IPI_allbutself(NMI_VECTOR);
771}
772
773static struct notifier_block crash_nmi_nb = {
774 .notifier_call = crash_nmi_callback,
775 /* we want to be the first one called */
776 .priority = NMI_LOCAL_HIGH_PRIOR+1,
777};
778
779/* Halt all other CPUs, calling the specified function on each of them
780 *
781 * This function can be used to halt all other CPUs on crash
782 * or emergency reboot time. The function passed as parameter
783 * will be called inside a NMI handler on all CPUs.
784 */
785void nmi_shootdown_cpus(nmi_shootdown_cb callback)
786{
787 unsigned long msecs;
788 local_irq_disable();
789
790 /* Make a note of crashing cpu. Will be used in NMI callback.*/
791 crashing_cpu = safe_smp_processor_id();
792
793 shootdown_callback = callback;
794
795 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
796 /* Would it be better to replace the trap vector here? */
797 if (register_die_notifier(&crash_nmi_nb))
798 return; /* return what? */
799 /* Ensure the new callback function is set before sending
800 * out the NMI
801 */
802 wmb();
803
804 smp_send_nmi_allbutself();
805
806 msecs = 1000; /* Wait at most a second for the other cpus to stop */
807 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
808 mdelay(1);
809 msecs--;
810 }
811
812 /* Leave the nmi callback set */
813}
814#else /* !CONFIG_SMP */
815void nmi_shootdown_cpus(nmi_shootdown_cb callback)
816{
817 /* No other CPUs to shoot down */
818}
819#endif
1#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
2
3#include <linux/module.h>
4#include <linux/reboot.h>
5#include <linux/init.h>
6#include <linux/pm.h>
7#include <linux/efi.h>
8#include <linux/dmi.h>
9#include <linux/sched.h>
10#include <linux/tboot.h>
11#include <linux/delay.h>
12#include <acpi/reboot.h>
13#include <asm/io.h>
14#include <asm/apic.h>
15#include <asm/io_apic.h>
16#include <asm/desc.h>
17#include <asm/hpet.h>
18#include <asm/pgtable.h>
19#include <asm/proto.h>
20#include <asm/reboot_fixups.h>
21#include <asm/reboot.h>
22#include <asm/pci_x86.h>
23#include <asm/virtext.h>
24#include <asm/cpu.h>
25#include <asm/nmi.h>
26#include <asm/smp.h>
27
28#include <linux/ctype.h>
29#include <linux/mc146818rtc.h>
30#include <asm/realmode.h>
31#include <asm/x86_init.h>
32#include <asm/efi.h>
33
34/*
35 * Power off function, if any
36 */
37void (*pm_power_off)(void);
38EXPORT_SYMBOL(pm_power_off);
39
40static const struct desc_ptr no_idt = {};
41
42/*
43 * This is set if we need to go through the 'emergency' path.
44 * When machine_emergency_restart() is called, we may be on
45 * an inconsistent state and won't be able to do a clean cleanup
46 */
47static int reboot_emergency;
48
49/* This is set by the PCI code if either type 1 or type 2 PCI is detected */
50bool port_cf9_safe = false;
51
52/*
53 * Reboot options and system auto-detection code provided by
54 * Dell Inc. so their systems "just work". :-)
55 */
56
57/*
58 * Some machines require the "reboot=b" or "reboot=k" commandline options,
59 * this quirk makes that automatic.
60 */
61static int __init set_bios_reboot(const struct dmi_system_id *d)
62{
63 if (reboot_type != BOOT_BIOS) {
64 reboot_type = BOOT_BIOS;
65 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
66 d->ident, "BIOS");
67 }
68 return 0;
69}
70
71void __noreturn machine_real_restart(unsigned int type)
72{
73 local_irq_disable();
74
75 /*
76 * Write zero to CMOS register number 0x0f, which the BIOS POST
77 * routine will recognize as telling it to do a proper reboot. (Well
78 * that's what this book in front of me says -- it may only apply to
79 * the Phoenix BIOS though, it's not clear). At the same time,
80 * disable NMIs by setting the top bit in the CMOS address register,
81 * as we're about to do peculiar things to the CPU. I'm not sure if
82 * `outb_p' is needed instead of just `outb'. Use it to be on the
83 * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
84 */
85 spin_lock(&rtc_lock);
86 CMOS_WRITE(0x00, 0x8f);
87 spin_unlock(&rtc_lock);
88
89 /*
90 * Switch back to the initial page table.
91 */
92#ifdef CONFIG_X86_32
93 load_cr3(initial_page_table);
94#else
95 write_cr3(real_mode_header->trampoline_pgd);
96#endif
97
98 /* Jump to the identity-mapped low memory code */
99#ifdef CONFIG_X86_32
100 asm volatile("jmpl *%0" : :
101 "rm" (real_mode_header->machine_real_restart_asm),
102 "a" (type));
103#else
104 asm volatile("ljmpl *%0" : :
105 "m" (real_mode_header->machine_real_restart_asm),
106 "D" (type));
107#endif
108 unreachable();
109}
110#ifdef CONFIG_APM_MODULE
111EXPORT_SYMBOL(machine_real_restart);
112#endif
113
114/*
115 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
116 */
117static int __init set_pci_reboot(const struct dmi_system_id *d)
118{
119 if (reboot_type != BOOT_CF9_FORCE) {
120 reboot_type = BOOT_CF9_FORCE;
121 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
122 d->ident, "PCI");
123 }
124 return 0;
125}
126
127static int __init set_kbd_reboot(const struct dmi_system_id *d)
128{
129 if (reboot_type != BOOT_KBD) {
130 reboot_type = BOOT_KBD;
131 pr_info("%s series board detected. Selecting %s-method for reboot.\n",
132 d->ident, "KBD");
133 }
134 return 0;
135}
136
137/*
138 * This is a single dmi_table handling all reboot quirks.
139 */
140static struct dmi_system_id __initdata reboot_dmi_table[] = {
141
142 /* Acer */
143 { /* Handle reboot issue on Acer Aspire one */
144 .callback = set_kbd_reboot,
145 .ident = "Acer Aspire One A110",
146 .matches = {
147 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
148 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
149 },
150 },
151
152 /* Apple */
153 { /* Handle problems with rebooting on Apple MacBook5 */
154 .callback = set_pci_reboot,
155 .ident = "Apple MacBook5",
156 .matches = {
157 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
158 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
159 },
160 },
161 { /* Handle problems with rebooting on Apple MacBookPro5 */
162 .callback = set_pci_reboot,
163 .ident = "Apple MacBookPro5",
164 .matches = {
165 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
166 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
167 },
168 },
169 { /* Handle problems with rebooting on Apple Macmini3,1 */
170 .callback = set_pci_reboot,
171 .ident = "Apple Macmini3,1",
172 .matches = {
173 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
174 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
175 },
176 },
177 { /* Handle problems with rebooting on the iMac9,1. */
178 .callback = set_pci_reboot,
179 .ident = "Apple iMac9,1",
180 .matches = {
181 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
182 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
183 },
184 },
185 { /* Handle problems with rebooting on the iMac10,1. */
186 .callback = set_pci_reboot,
187 .ident = "Apple iMac10,1",
188 .matches = {
189 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
190 DMI_MATCH(DMI_PRODUCT_NAME, "iMac10,1"),
191 },
192 },
193
194 /* ASRock */
195 { /* Handle problems with rebooting on ASRock Q1900DC-ITX */
196 .callback = set_pci_reboot,
197 .ident = "ASRock Q1900DC-ITX",
198 .matches = {
199 DMI_MATCH(DMI_BOARD_VENDOR, "ASRock"),
200 DMI_MATCH(DMI_BOARD_NAME, "Q1900DC-ITX"),
201 },
202 },
203
204 /* ASUS */
205 { /* Handle problems with rebooting on ASUS P4S800 */
206 .callback = set_bios_reboot,
207 .ident = "ASUS P4S800",
208 .matches = {
209 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
210 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
211 },
212 },
213
214 /* Certec */
215 { /* Handle problems with rebooting on Certec BPC600 */
216 .callback = set_pci_reboot,
217 .ident = "Certec BPC600",
218 .matches = {
219 DMI_MATCH(DMI_SYS_VENDOR, "Certec"),
220 DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"),
221 },
222 },
223
224 /* Dell */
225 { /* Handle problems with rebooting on Dell DXP061 */
226 .callback = set_bios_reboot,
227 .ident = "Dell DXP061",
228 .matches = {
229 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
230 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
231 },
232 },
233 { /* Handle problems with rebooting on Dell E520's */
234 .callback = set_bios_reboot,
235 .ident = "Dell E520",
236 .matches = {
237 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
238 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
239 },
240 },
241 { /* Handle problems with rebooting on the Latitude E5410. */
242 .callback = set_pci_reboot,
243 .ident = "Dell Latitude E5410",
244 .matches = {
245 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
246 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"),
247 },
248 },
249 { /* Handle problems with rebooting on the Latitude E5420. */
250 .callback = set_pci_reboot,
251 .ident = "Dell Latitude E5420",
252 .matches = {
253 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
254 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
255 },
256 },
257 { /* Handle problems with rebooting on the Latitude E6320. */
258 .callback = set_pci_reboot,
259 .ident = "Dell Latitude E6320",
260 .matches = {
261 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
262 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
263 },
264 },
265 { /* Handle problems with rebooting on the Latitude E6420. */
266 .callback = set_pci_reboot,
267 .ident = "Dell Latitude E6420",
268 .matches = {
269 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
270 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
271 },
272 },
273 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
274 .callback = set_bios_reboot,
275 .ident = "Dell OptiPlex 330",
276 .matches = {
277 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
278 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
279 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
280 },
281 },
282 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
283 .callback = set_bios_reboot,
284 .ident = "Dell OptiPlex 360",
285 .matches = {
286 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
287 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
288 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
289 },
290 },
291 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */
292 .callback = set_bios_reboot,
293 .ident = "Dell OptiPlex 745",
294 .matches = {
295 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
296 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
297 },
298 },
299 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */
300 .callback = set_bios_reboot,
301 .ident = "Dell OptiPlex 745",
302 .matches = {
303 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
304 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
305 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
306 },
307 },
308 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
309 .callback = set_bios_reboot,
310 .ident = "Dell OptiPlex 745",
311 .matches = {
312 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
313 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
314 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
315 },
316 },
317 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
318 .callback = set_bios_reboot,
319 .ident = "Dell OptiPlex 760",
320 .matches = {
321 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
322 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
323 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
324 },
325 },
326 { /* Handle problems with rebooting on the OptiPlex 990. */
327 .callback = set_pci_reboot,
328 .ident = "Dell OptiPlex 990",
329 .matches = {
330 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
331 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
332 },
333 },
334 { /* Handle problems with rebooting on Dell 300's */
335 .callback = set_bios_reboot,
336 .ident = "Dell PowerEdge 300",
337 .matches = {
338 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
339 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
340 },
341 },
342 { /* Handle problems with rebooting on Dell 1300's */
343 .callback = set_bios_reboot,
344 .ident = "Dell PowerEdge 1300",
345 .matches = {
346 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
347 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
348 },
349 },
350 { /* Handle problems with rebooting on Dell 2400's */
351 .callback = set_bios_reboot,
352 .ident = "Dell PowerEdge 2400",
353 .matches = {
354 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
355 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
356 },
357 },
358 { /* Handle problems with rebooting on the Dell PowerEdge C6100. */
359 .callback = set_pci_reboot,
360 .ident = "Dell PowerEdge C6100",
361 .matches = {
362 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
363 DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
364 },
365 },
366 { /* Handle problems with rebooting on the Precision M6600. */
367 .callback = set_pci_reboot,
368 .ident = "Dell Precision M6600",
369 .matches = {
370 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
371 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
372 },
373 },
374 { /* Handle problems with rebooting on Dell T5400's */
375 .callback = set_bios_reboot,
376 .ident = "Dell Precision T5400",
377 .matches = {
378 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
379 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
380 },
381 },
382 { /* Handle problems with rebooting on Dell T7400's */
383 .callback = set_bios_reboot,
384 .ident = "Dell Precision T7400",
385 .matches = {
386 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
387 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
388 },
389 },
390 { /* Handle problems with rebooting on Dell XPS710 */
391 .callback = set_bios_reboot,
392 .ident = "Dell XPS710",
393 .matches = {
394 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
395 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
396 },
397 },
398
399 /* Hewlett-Packard */
400 { /* Handle problems with rebooting on HP laptops */
401 .callback = set_bios_reboot,
402 .ident = "HP Compaq Laptop",
403 .matches = {
404 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
405 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
406 },
407 },
408
409 /* Sony */
410 { /* Handle problems with rebooting on Sony VGN-Z540N */
411 .callback = set_bios_reboot,
412 .ident = "Sony VGN-Z540N",
413 .matches = {
414 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
415 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
416 },
417 },
418
419 { }
420};
421
422static int __init reboot_init(void)
423{
424 int rv;
425
426 /*
427 * Only do the DMI check if reboot_type hasn't been overridden
428 * on the command line
429 */
430 if (!reboot_default)
431 return 0;
432
433 /*
434 * The DMI quirks table takes precedence. If no quirks entry
435 * matches and the ACPI Hardware Reduced bit is set, force EFI
436 * reboot.
437 */
438 rv = dmi_check_system(reboot_dmi_table);
439
440 if (!rv && efi_reboot_required())
441 reboot_type = BOOT_EFI;
442
443 return 0;
444}
445core_initcall(reboot_init);
446
447static inline void kb_wait(void)
448{
449 int i;
450
451 for (i = 0; i < 0x10000; i++) {
452 if ((inb(0x64) & 0x02) == 0)
453 break;
454 udelay(2);
455 }
456}
457
458static void vmxoff_nmi(int cpu, struct pt_regs *regs)
459{
460 cpu_emergency_vmxoff();
461}
462
463/* Use NMIs as IPIs to tell all CPUs to disable virtualization */
464static void emergency_vmx_disable_all(void)
465{
466 /* Just make sure we won't change CPUs while doing this */
467 local_irq_disable();
468
469 /*
470 * We need to disable VMX on all CPUs before rebooting, otherwise
471 * we risk hanging up the machine, because the CPU ignore INIT
472 * signals when VMX is enabled.
473 *
474 * We can't take any locks and we may be on an inconsistent
475 * state, so we use NMIs as IPIs to tell the other CPUs to disable
476 * VMX and halt.
477 *
478 * For safety, we will avoid running the nmi_shootdown_cpus()
479 * stuff unnecessarily, but we don't have a way to check
480 * if other CPUs have VMX enabled. So we will call it only if the
481 * CPU we are running on has VMX enabled.
482 *
483 * We will miss cases where VMX is not enabled on all CPUs. This
484 * shouldn't do much harm because KVM always enable VMX on all
485 * CPUs anyway. But we can miss it on the small window where KVM
486 * is still enabling VMX.
487 */
488 if (cpu_has_vmx() && cpu_vmx_enabled()) {
489 /* Disable VMX on this CPU. */
490 cpu_vmxoff();
491
492 /* Halt and disable VMX on the other CPUs */
493 nmi_shootdown_cpus(vmxoff_nmi);
494
495 }
496}
497
498
499void __attribute__((weak)) mach_reboot_fixups(void)
500{
501}
502
503/*
504 * To the best of our knowledge Windows compatible x86 hardware expects
505 * the following on reboot:
506 *
507 * 1) If the FADT has the ACPI reboot register flag set, try it
508 * 2) If still alive, write to the keyboard controller
509 * 3) If still alive, write to the ACPI reboot register again
510 * 4) If still alive, write to the keyboard controller again
511 * 5) If still alive, call the EFI runtime service to reboot
512 * 6) If no EFI runtime service, call the BIOS to do a reboot
513 *
514 * We default to following the same pattern. We also have
515 * two other reboot methods: 'triple fault' and 'PCI', which
516 * can be triggered via the reboot= kernel boot option or
517 * via quirks.
518 *
519 * This means that this function can never return, it can misbehave
520 * by not rebooting properly and hanging.
521 */
522static void native_machine_emergency_restart(void)
523{
524 int i;
525 int attempt = 0;
526 int orig_reboot_type = reboot_type;
527 unsigned short mode;
528
529 if (reboot_emergency)
530 emergency_vmx_disable_all();
531
532 tboot_shutdown(TB_SHUTDOWN_REBOOT);
533
534 /* Tell the BIOS if we want cold or warm reboot */
535 mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
536 *((unsigned short *)__va(0x472)) = mode;
537
538 for (;;) {
539 /* Could also try the reset bit in the Hammer NB */
540 switch (reboot_type) {
541 case BOOT_ACPI:
542 acpi_reboot();
543 reboot_type = BOOT_KBD;
544 break;
545
546 case BOOT_KBD:
547 mach_reboot_fixups(); /* For board specific fixups */
548
549 for (i = 0; i < 10; i++) {
550 kb_wait();
551 udelay(50);
552 outb(0xfe, 0x64); /* Pulse reset low */
553 udelay(50);
554 }
555 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
556 attempt = 1;
557 reboot_type = BOOT_ACPI;
558 } else {
559 reboot_type = BOOT_EFI;
560 }
561 break;
562
563 case BOOT_EFI:
564 efi_reboot(reboot_mode, NULL);
565 reboot_type = BOOT_BIOS;
566 break;
567
568 case BOOT_BIOS:
569 machine_real_restart(MRR_BIOS);
570
571 /* We're probably dead after this, but... */
572 reboot_type = BOOT_CF9_SAFE;
573 break;
574
575 case BOOT_CF9_FORCE:
576 port_cf9_safe = true;
577 /* Fall through */
578
579 case BOOT_CF9_SAFE:
580 if (port_cf9_safe) {
581 u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E;
582 u8 cf9 = inb(0xcf9) & ~reboot_code;
583 outb(cf9|2, 0xcf9); /* Request hard reset */
584 udelay(50);
585 /* Actually do the reset */
586 outb(cf9|reboot_code, 0xcf9);
587 udelay(50);
588 }
589 reboot_type = BOOT_TRIPLE;
590 break;
591
592 case BOOT_TRIPLE:
593 load_idt(&no_idt);
594 __asm__ __volatile__("int3");
595
596 /* We're probably dead after this, but... */
597 reboot_type = BOOT_KBD;
598 break;
599 }
600 }
601}
602
603void native_machine_shutdown(void)
604{
605 /* Stop the cpus and apics */
606#ifdef CONFIG_X86_IO_APIC
607 /*
608 * Disabling IO APIC before local APIC is a workaround for
609 * erratum AVR31 in "Intel Atom Processor C2000 Product Family
610 * Specification Update". In this situation, interrupts that target
611 * a Logical Processor whose Local APIC is either in the process of
612 * being hardware disabled or software disabled are neither delivered
613 * nor discarded. When this erratum occurs, the processor may hang.
614 *
615 * Even without the erratum, it still makes sense to quiet IO APIC
616 * before disabling Local APIC.
617 */
618 disable_IO_APIC();
619#endif
620
621#ifdef CONFIG_SMP
622 /*
623 * Stop all of the others. Also disable the local irq to
624 * not receive the per-cpu timer interrupt which may trigger
625 * scheduler's load balance.
626 */
627 local_irq_disable();
628 stop_other_cpus();
629#endif
630
631 lapic_shutdown();
632
633#ifdef CONFIG_HPET_TIMER
634 hpet_disable();
635#endif
636
637#ifdef CONFIG_X86_64
638 x86_platform.iommu_shutdown();
639#endif
640}
641
642static void __machine_emergency_restart(int emergency)
643{
644 reboot_emergency = emergency;
645 machine_ops.emergency_restart();
646}
647
648static void native_machine_restart(char *__unused)
649{
650 pr_notice("machine restart\n");
651
652 if (!reboot_force)
653 machine_shutdown();
654 __machine_emergency_restart(0);
655}
656
657static void native_machine_halt(void)
658{
659 /* Stop other cpus and apics */
660 machine_shutdown();
661
662 tboot_shutdown(TB_SHUTDOWN_HALT);
663
664 stop_this_cpu(NULL);
665}
666
667static void native_machine_power_off(void)
668{
669 if (pm_power_off) {
670 if (!reboot_force)
671 machine_shutdown();
672 pm_power_off();
673 }
674 /* A fallback in case there is no PM info available */
675 tboot_shutdown(TB_SHUTDOWN_HALT);
676}
677
678struct machine_ops machine_ops = {
679 .power_off = native_machine_power_off,
680 .shutdown = native_machine_shutdown,
681 .emergency_restart = native_machine_emergency_restart,
682 .restart = native_machine_restart,
683 .halt = native_machine_halt,
684#ifdef CONFIG_KEXEC_CORE
685 .crash_shutdown = native_machine_crash_shutdown,
686#endif
687};
688
689void machine_power_off(void)
690{
691 machine_ops.power_off();
692}
693
694void machine_shutdown(void)
695{
696 machine_ops.shutdown();
697}
698
699void machine_emergency_restart(void)
700{
701 __machine_emergency_restart(1);
702}
703
704void machine_restart(char *cmd)
705{
706 machine_ops.restart(cmd);
707}
708
709void machine_halt(void)
710{
711 machine_ops.halt();
712}
713
714#ifdef CONFIG_KEXEC_CORE
715void machine_crash_shutdown(struct pt_regs *regs)
716{
717 machine_ops.crash_shutdown(regs);
718}
719#endif
720
721
722#if defined(CONFIG_SMP)
723
724/* This keeps a track of which one is crashing cpu. */
725static int crashing_cpu;
726static nmi_shootdown_cb shootdown_callback;
727
728static atomic_t waiting_for_crash_ipi;
729static int crash_ipi_issued;
730
731static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
732{
733 int cpu;
734
735 cpu = raw_smp_processor_id();
736
737 /*
738 * Don't do anything if this handler is invoked on crashing cpu.
739 * Otherwise, system will completely hang. Crashing cpu can get
740 * an NMI if system was initially booted with nmi_watchdog parameter.
741 */
742 if (cpu == crashing_cpu)
743 return NMI_HANDLED;
744 local_irq_disable();
745
746 shootdown_callback(cpu, regs);
747
748 atomic_dec(&waiting_for_crash_ipi);
749 /* Assume hlt works */
750 halt();
751 for (;;)
752 cpu_relax();
753
754 return NMI_HANDLED;
755}
756
757static void smp_send_nmi_allbutself(void)
758{
759 apic->send_IPI_allbutself(NMI_VECTOR);
760}
761
762/*
763 * Halt all other CPUs, calling the specified function on each of them
764 *
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.
768 */
769void nmi_shootdown_cpus(nmi_shootdown_cb callback)
770{
771 unsigned long msecs;
772 local_irq_disable();
773
774 /* Make a note of crashing cpu. Will be used in NMI callback. */
775 crashing_cpu = safe_smp_processor_id();
776
777 shootdown_callback = callback;
778
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_nmi_handler(NMI_LOCAL, crash_nmi_callback,
782 NMI_FLAG_FIRST, "crash"))
783 return; /* Return what? */
784 /*
785 * Ensure the new callback function is set before sending
786 * out the NMI
787 */
788 wmb();
789
790 smp_send_nmi_allbutself();
791
792 /* Kick CPUs looping in NMI context. */
793 WRITE_ONCE(crash_ipi_issued, 1);
794
795 msecs = 1000; /* Wait at most a second for the other cpus to stop */
796 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
797 mdelay(1);
798 msecs--;
799 }
800
801 /* Leave the nmi callback set */
802}
803
804/*
805 * Check if the crash dumping IPI got issued and if so, call its callback
806 * directly. This function is used when we have already been in NMI handler.
807 * It doesn't return.
808 */
809void run_crash_ipi_callback(struct pt_regs *regs)
810{
811 if (crash_ipi_issued)
812 crash_nmi_callback(0, regs);
813}
814
815/* Override the weak function in kernel/panic.c */
816void nmi_panic_self_stop(struct pt_regs *regs)
817{
818 while (1) {
819 /* If no CPU is preparing crash dump, we simply loop here. */
820 run_crash_ipi_callback(regs);
821 cpu_relax();
822 }
823}
824
825#else /* !CONFIG_SMP */
826void nmi_shootdown_cpus(nmi_shootdown_cb callback)
827{
828 /* No other CPUs to shoot down */
829}
830
831void run_crash_ipi_callback(struct pt_regs *regs)
832{
833}
834#endif