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/desc.h>
16#include <asm/hpet.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>
23#include <asm/cpu.h>
24#include <asm/nmi.h>
25#include <asm/smp.h>
26
27#include <linux/ctype.h>
28#include <linux/mc146818rtc.h>
29#include <asm/realmode.h>
30#include <asm/x86_init.h>
31
32
33
34
35void (*pm_power_off)(void);
36EXPORT_SYMBOL(pm_power_off);
37
38static const struct desc_ptr no_idt = {};
39
40
41
42
43
44
45static int reboot_emergency;
46
47
48bool port_cf9_safe = false;
49
50
51
52
53
54
55
56
57
58
59static int __init set_bios_reboot(const struct dmi_system_id *d)
60{
61 if (reboot_type != BOOT_BIOS) {
62 reboot_type = BOOT_BIOS;
63 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
64 "BIOS", d->ident);
65 }
66 return 0;
67}
68
69void __noreturn machine_real_restart(unsigned int type)
70{
71 local_irq_disable();
72
73
74
75
76
77
78
79
80
81
82
83 spin_lock(&rtc_lock);
84 CMOS_WRITE(0x00, 0x8f);
85 spin_unlock(&rtc_lock);
86
87
88
89
90#ifdef CONFIG_X86_32
91 load_cr3(initial_page_table);
92#else
93 write_cr3(real_mode_header->trampoline_pgd);
94#endif
95
96
97#ifdef CONFIG_X86_32
98 asm volatile("jmpl *%0" : :
99 "rm" (real_mode_header->machine_real_restart_asm),
100 "a" (type));
101#else
102 asm volatile("ljmpl *%0" : :
103 "m" (real_mode_header->machine_real_restart_asm),
104 "D" (type));
105#endif
106 unreachable();
107}
108#ifdef CONFIG_APM_MODULE
109EXPORT_SYMBOL(machine_real_restart);
110#endif
111
112
113
114
115static int __init set_pci_reboot(const struct dmi_system_id *d)
116{
117 if (reboot_type != BOOT_CF9) {
118 reboot_type = BOOT_CF9;
119 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
120 "PCI", d->ident);
121 }
122 return 0;
123}
124
125static int __init set_kbd_reboot(const struct dmi_system_id *d)
126{
127 if (reboot_type != BOOT_KBD) {
128 reboot_type = BOOT_KBD;
129 pr_info("%s series board detected. Selecting %s-method for reboot.\n",
130 "KBD", d->ident);
131 }
132 return 0;
133}
134
135
136
137
138static struct dmi_system_id __initdata reboot_dmi_table[] = {
139 {
140 .callback = set_bios_reboot,
141 .ident = "Dell E520",
142 .matches = {
143 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
144 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
145 },
146 },
147 {
148 .callback = set_bios_reboot,
149 .ident = "Dell PowerEdge 1300",
150 .matches = {
151 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
152 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
153 },
154 },
155 {
156 .callback = set_bios_reboot,
157 .ident = "Dell PowerEdge 300",
158 .matches = {
159 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
160 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
161 },
162 },
163 {
164 .callback = set_bios_reboot,
165 .ident = "Dell OptiPlex 745",
166 .matches = {
167 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
168 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
169 },
170 },
171 {
172 .callback = set_bios_reboot,
173 .ident = "Dell OptiPlex 745",
174 .matches = {
175 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
176 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
177 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
178 },
179 },
180 {
181 .callback = set_bios_reboot,
182 .ident = "Dell OptiPlex 745",
183 .matches = {
184 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
185 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
186 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
187 },
188 },
189 {
190 .callback = set_bios_reboot,
191 .ident = "Dell OptiPlex 330",
192 .matches = {
193 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
194 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
195 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
196 },
197 },
198 {
199 .callback = set_bios_reboot,
200 .ident = "Dell OptiPlex 360",
201 .matches = {
202 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
203 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
204 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
205 },
206 },
207 {
208 .callback = set_bios_reboot,
209 .ident = "Dell OptiPlex 760",
210 .matches = {
211 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
212 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
213 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
214 },
215 },
216 {
217 .callback = set_bios_reboot,
218 .ident = "Dell PowerEdge 2400",
219 .matches = {
220 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
221 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
222 },
223 },
224 {
225 .callback = set_bios_reboot,
226 .ident = "Dell Precision T5400",
227 .matches = {
228 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
229 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
230 },
231 },
232 {
233 .callback = set_bios_reboot,
234 .ident = "Dell Precision T7400",
235 .matches = {
236 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
237 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
238 },
239 },
240 {
241 .callback = set_bios_reboot,
242 .ident = "HP Compaq Laptop",
243 .matches = {
244 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
245 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
246 },
247 },
248 {
249 .callback = set_bios_reboot,
250 .ident = "Dell XPS710",
251 .matches = {
252 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
253 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
254 },
255 },
256 {
257 .callback = set_bios_reboot,
258 .ident = "Dell DXP061",
259 .matches = {
260 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
261 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
262 },
263 },
264 {
265 .callback = set_bios_reboot,
266 .ident = "Sony VGN-Z540N",
267 .matches = {
268 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
269 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
270 },
271 },
272 {
273 .callback = set_bios_reboot,
274 .ident = "ASUS P4S800",
275 .matches = {
276 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
277 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
278 },
279 },
280
281 {
282 .callback = set_kbd_reboot,
283 .ident = "Acer Aspire One A110",
284 .matches = {
285 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
286 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
287 },
288 },
289 {
290 .callback = set_pci_reboot,
291 .ident = "Apple MacBook5",
292 .matches = {
293 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
294 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
295 },
296 },
297 {
298 .callback = set_pci_reboot,
299 .ident = "Apple MacBookPro5",
300 .matches = {
301 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
302 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
303 },
304 },
305 {
306 .callback = set_pci_reboot,
307 .ident = "Apple Macmini3,1",
308 .matches = {
309 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
310 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
311 },
312 },
313 {
314 .callback = set_pci_reboot,
315 .ident = "Apple iMac9,1",
316 .matches = {
317 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
318 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
319 },
320 },
321 {
322 .callback = set_pci_reboot,
323 .ident = "Dell Latitude E6320",
324 .matches = {
325 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
326 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
327 },
328 },
329 {
330 .callback = set_pci_reboot,
331 .ident = "Dell Latitude E5420",
332 .matches = {
333 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
334 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
335 },
336 },
337 {
338 .callback = set_pci_reboot,
339 .ident = "Dell Latitude E6420",
340 .matches = {
341 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
342 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
343 },
344 },
345 {
346 .callback = set_pci_reboot,
347 .ident = "Dell OptiPlex 990",
348 .matches = {
349 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
350 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
351 },
352 },
353 {
354 .callback = set_pci_reboot,
355 .ident = "Dell OptiPlex 990",
356 .matches = {
357 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
358 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
359 },
360 },
361 { }
362};
363
364static int __init reboot_init(void)
365{
366
367
368
369
370 if (reboot_default)
371 dmi_check_system(reboot_dmi_table);
372 return 0;
373}
374core_initcall(reboot_init);
375
376static inline void kb_wait(void)
377{
378 int i;
379
380 for (i = 0; i < 0x10000; i++) {
381 if ((inb(0x64) & 0x02) == 0)
382 break;
383 udelay(2);
384 }
385}
386
387static void vmxoff_nmi(int cpu, struct pt_regs *regs)
388{
389 cpu_emergency_vmxoff();
390}
391
392
393static void emergency_vmx_disable_all(void)
394{
395
396 local_irq_disable();
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417 if (cpu_has_vmx() && cpu_vmx_enabled()) {
418
419 cpu_vmxoff();
420
421
422 nmi_shootdown_cpus(vmxoff_nmi);
423
424 }
425}
426
427
428void __attribute__((weak)) mach_reboot_fixups(void)
429{
430}
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445static void native_machine_emergency_restart(void)
446{
447 int i;
448 int attempt = 0;
449 int orig_reboot_type = reboot_type;
450 unsigned short mode;
451
452 if (reboot_emergency)
453 emergency_vmx_disable_all();
454
455 tboot_shutdown(TB_SHUTDOWN_REBOOT);
456
457
458 mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
459 *((unsigned short *)__va(0x472)) = mode;
460
461 for (;;) {
462
463 switch (reboot_type) {
464 case BOOT_KBD:
465 mach_reboot_fixups();
466
467 for (i = 0; i < 10; i++) {
468 kb_wait();
469 udelay(50);
470 outb(0xfe, 0x64);
471 udelay(50);
472 }
473 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
474 attempt = 1;
475 reboot_type = BOOT_ACPI;
476 } else {
477 reboot_type = BOOT_TRIPLE;
478 }
479 break;
480
481 case BOOT_TRIPLE:
482 load_idt(&no_idt);
483 __asm__ __volatile__("int3");
484
485 reboot_type = BOOT_KBD;
486 break;
487
488 case BOOT_BIOS:
489 machine_real_restart(MRR_BIOS);
490
491 reboot_type = BOOT_KBD;
492 break;
493
494 case BOOT_ACPI:
495 acpi_reboot();
496 reboot_type = BOOT_KBD;
497 break;
498
499 case BOOT_EFI:
500 if (efi_enabled(EFI_RUNTIME_SERVICES))
501 efi.reset_system(reboot_mode == REBOOT_WARM ?
502 EFI_RESET_WARM :
503 EFI_RESET_COLD,
504 EFI_SUCCESS, 0, NULL);
505 reboot_type = BOOT_KBD;
506 break;
507
508 case BOOT_CF9:
509 port_cf9_safe = true;
510
511
512 case BOOT_CF9_COND:
513 if (port_cf9_safe) {
514 u8 cf9 = inb(0xcf9) & ~6;
515 outb(cf9|2, 0xcf9);
516 udelay(50);
517 outb(cf9|6, 0xcf9);
518 udelay(50);
519 }
520 reboot_type = BOOT_KBD;
521 break;
522 }
523 }
524}
525
526void native_machine_shutdown(void)
527{
528
529#ifdef CONFIG_SMP
530
531
532
533
534
535 local_irq_disable();
536 stop_other_cpus();
537#endif
538
539 lapic_shutdown();
540
541#ifdef CONFIG_X86_IO_APIC
542 disable_IO_APIC();
543#endif
544
545#ifdef CONFIG_HPET_TIMER
546 hpet_disable();
547#endif
548
549#ifdef CONFIG_X86_64
550 x86_platform.iommu_shutdown();
551#endif
552}
553
554static void __machine_emergency_restart(int emergency)
555{
556 reboot_emergency = emergency;
557 machine_ops.emergency_restart();
558}
559
560static void native_machine_restart(char *__unused)
561{
562 pr_notice("machine restart\n");
563
564 if (!reboot_force)
565 machine_shutdown();
566 __machine_emergency_restart(0);
567}
568
569static void native_machine_halt(void)
570{
571
572 machine_shutdown();
573
574 tboot_shutdown(TB_SHUTDOWN_HALT);
575
576 stop_this_cpu(NULL);
577}
578
579static void native_machine_power_off(void)
580{
581 if (pm_power_off) {
582 if (!reboot_force)
583 machine_shutdown();
584 pm_power_off();
585 }
586
587 tboot_shutdown(TB_SHUTDOWN_HALT);
588}
589
590struct machine_ops machine_ops = {
591 .power_off = native_machine_power_off,
592 .shutdown = native_machine_shutdown,
593 .emergency_restart = native_machine_emergency_restart,
594 .restart = native_machine_restart,
595 .halt = native_machine_halt,
596#ifdef CONFIG_KEXEC
597 .crash_shutdown = native_machine_crash_shutdown,
598#endif
599};
600
601void machine_power_off(void)
602{
603 machine_ops.power_off();
604}
605
606void machine_shutdown(void)
607{
608 machine_ops.shutdown();
609}
610
611void machine_emergency_restart(void)
612{
613 __machine_emergency_restart(1);
614}
615
616void machine_restart(char *cmd)
617{
618 machine_ops.restart(cmd);
619}
620
621void machine_halt(void)
622{
623 machine_ops.halt();
624}
625
626#ifdef CONFIG_KEXEC
627void machine_crash_shutdown(struct pt_regs *regs)
628{
629 machine_ops.crash_shutdown(regs);
630}
631#endif
632
633
634#if defined(CONFIG_SMP)
635
636
637static int crashing_cpu;
638static nmi_shootdown_cb shootdown_callback;
639
640static atomic_t waiting_for_crash_ipi;
641
642static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
643{
644 int cpu;
645
646 cpu = raw_smp_processor_id();
647
648
649
650
651
652
653 if (cpu == crashing_cpu)
654 return NMI_HANDLED;
655 local_irq_disable();
656
657 shootdown_callback(cpu, regs);
658
659 atomic_dec(&waiting_for_crash_ipi);
660
661 halt();
662 for (;;)
663 cpu_relax();
664
665 return NMI_HANDLED;
666}
667
668static void smp_send_nmi_allbutself(void)
669{
670 apic->send_IPI_allbutself(NMI_VECTOR);
671}
672
673
674
675
676
677
678
679
680void nmi_shootdown_cpus(nmi_shootdown_cb callback)
681{
682 unsigned long msecs;
683 local_irq_disable();
684
685
686 crashing_cpu = safe_smp_processor_id();
687
688 shootdown_callback = callback;
689
690 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
691
692 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
693 NMI_FLAG_FIRST, "crash"))
694 return;
695
696
697
698
699 wmb();
700
701 smp_send_nmi_allbutself();
702
703 msecs = 1000;
704 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
705 mdelay(1);
706 msecs--;
707 }
708
709
710}
711#else
712void nmi_shootdown_cpus(nmi_shootdown_cb callback)
713{
714
715}
716#endif
717