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1// SPDX-License-Identifier: GPL-2.0
2#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
3
4#include <linux/export.h>
5#include <linux/reboot.h>
6#include <linux/init.h>
7#include <linux/pm.h>
8#include <linux/efi.h>
9#include <linux/dmi.h>
10#include <linux/sched.h>
11#include <linux/tboot.h>
12#include <linux/delay.h>
13#include <linux/frame.h>
14#include <acpi/reboot.h>
15#include <asm/io.h>
16#include <asm/apic.h>
17#include <asm/io_apic.h>
18#include <asm/desc.h>
19#include <asm/hpet.h>
20#include <asm/pgtable.h>
21#include <asm/proto.h>
22#include <asm/reboot_fixups.h>
23#include <asm/reboot.h>
24#include <asm/pci_x86.h>
25#include <asm/virtext.h>
26#include <asm/cpu.h>
27#include <asm/nmi.h>
28#include <asm/smp.h>
29
30#include <linux/ctype.h>
31#include <linux/mc146818rtc.h>
32#include <asm/realmode.h>
33#include <asm/x86_init.h>
34#include <asm/efi.h>
35
36/*
37 * Power off function, if any
38 */
39void (*pm_power_off)(void);
40EXPORT_SYMBOL(pm_power_off);
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=a" commandline options
59 */
60static int __init set_acpi_reboot(const struct dmi_system_id *d)
61{
62 if (reboot_type != BOOT_ACPI) {
63 reboot_type = BOOT_ACPI;
64 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
65 d->ident, "ACPI");
66 }
67 return 0;
68}
69
70/*
71 * Some machines require the "reboot=b" or "reboot=k" commandline options,
72 * this quirk makes that automatic.
73 */
74static int __init set_bios_reboot(const struct dmi_system_id *d)
75{
76 if (reboot_type != BOOT_BIOS) {
77 reboot_type = BOOT_BIOS;
78 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
79 d->ident, "BIOS");
80 }
81 return 0;
82}
83
84/*
85 * Some machines don't handle the default ACPI reboot method and
86 * require the EFI reboot method:
87 */
88static int __init set_efi_reboot(const struct dmi_system_id *d)
89{
90 if (reboot_type != BOOT_EFI && !efi_runtime_disabled()) {
91 reboot_type = BOOT_EFI;
92 pr_info("%s series board detected. Selecting EFI-method for reboot.\n", d->ident);
93 }
94 return 0;
95}
96
97void __noreturn machine_real_restart(unsigned int type)
98{
99 local_irq_disable();
100
101 /*
102 * Write zero to CMOS register number 0x0f, which the BIOS POST
103 * routine will recognize as telling it to do a proper reboot. (Well
104 * that's what this book in front of me says -- it may only apply to
105 * the Phoenix BIOS though, it's not clear). At the same time,
106 * disable NMIs by setting the top bit in the CMOS address register,
107 * as we're about to do peculiar things to the CPU. I'm not sure if
108 * `outb_p' is needed instead of just `outb'. Use it to be on the
109 * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
110 */
111 spin_lock(&rtc_lock);
112 CMOS_WRITE(0x00, 0x8f);
113 spin_unlock(&rtc_lock);
114
115 /*
116 * Switch back to the initial page table.
117 */
118#ifdef CONFIG_X86_32
119 load_cr3(initial_page_table);
120#else
121 write_cr3(real_mode_header->trampoline_pgd);
122
123 /* Exiting long mode will fail if CR4.PCIDE is set. */
124 if (boot_cpu_has(X86_FEATURE_PCID))
125 cr4_clear_bits(X86_CR4_PCIDE);
126#endif
127
128 /* Jump to the identity-mapped low memory code */
129#ifdef CONFIG_X86_32
130 asm volatile("jmpl *%0" : :
131 "rm" (real_mode_header->machine_real_restart_asm),
132 "a" (type));
133#else
134 asm volatile("ljmpl *%0" : :
135 "m" (real_mode_header->machine_real_restart_asm),
136 "D" (type));
137#endif
138 unreachable();
139}
140#ifdef CONFIG_APM_MODULE
141EXPORT_SYMBOL(machine_real_restart);
142#endif
143STACK_FRAME_NON_STANDARD(machine_real_restart);
144
145/*
146 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
147 */
148static int __init set_pci_reboot(const struct dmi_system_id *d)
149{
150 if (reboot_type != BOOT_CF9_FORCE) {
151 reboot_type = BOOT_CF9_FORCE;
152 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
153 d->ident, "PCI");
154 }
155 return 0;
156}
157
158static int __init set_kbd_reboot(const struct dmi_system_id *d)
159{
160 if (reboot_type != BOOT_KBD) {
161 reboot_type = BOOT_KBD;
162 pr_info("%s series board detected. Selecting %s-method for reboot.\n",
163 d->ident, "KBD");
164 }
165 return 0;
166}
167
168/*
169 * This is a single dmi_table handling all reboot quirks.
170 */
171static const struct dmi_system_id reboot_dmi_table[] __initconst = {
172
173 /* Acer */
174 { /* Handle reboot issue on Acer Aspire one */
175 .callback = set_kbd_reboot,
176 .ident = "Acer Aspire One A110",
177 .matches = {
178 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
179 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
180 },
181 },
182 { /* Handle reboot issue on Acer TravelMate X514-51T */
183 .callback = set_efi_reboot,
184 .ident = "Acer TravelMate X514-51T",
185 .matches = {
186 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
187 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate X514-51T"),
188 },
189 },
190
191 /* Apple */
192 { /* Handle problems with rebooting on Apple MacBook5 */
193 .callback = set_pci_reboot,
194 .ident = "Apple MacBook5",
195 .matches = {
196 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
197 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
198 },
199 },
200 { /* Handle problems with rebooting on Apple MacBookPro5 */
201 .callback = set_pci_reboot,
202 .ident = "Apple MacBookPro5",
203 .matches = {
204 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
205 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
206 },
207 },
208 { /* Handle problems with rebooting on Apple Macmini3,1 */
209 .callback = set_pci_reboot,
210 .ident = "Apple Macmini3,1",
211 .matches = {
212 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
213 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
214 },
215 },
216 { /* Handle problems with rebooting on the iMac9,1. */
217 .callback = set_pci_reboot,
218 .ident = "Apple iMac9,1",
219 .matches = {
220 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
221 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
222 },
223 },
224 { /* Handle problems with rebooting on the iMac10,1. */
225 .callback = set_pci_reboot,
226 .ident = "Apple iMac10,1",
227 .matches = {
228 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
229 DMI_MATCH(DMI_PRODUCT_NAME, "iMac10,1"),
230 },
231 },
232
233 /* ASRock */
234 { /* Handle problems with rebooting on ASRock Q1900DC-ITX */
235 .callback = set_pci_reboot,
236 .ident = "ASRock Q1900DC-ITX",
237 .matches = {
238 DMI_MATCH(DMI_BOARD_VENDOR, "ASRock"),
239 DMI_MATCH(DMI_BOARD_NAME, "Q1900DC-ITX"),
240 },
241 },
242
243 /* ASUS */
244 { /* Handle problems with rebooting on ASUS P4S800 */
245 .callback = set_bios_reboot,
246 .ident = "ASUS P4S800",
247 .matches = {
248 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
249 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
250 },
251 },
252 { /* Handle problems with rebooting on ASUS EeeBook X205TA */
253 .callback = set_acpi_reboot,
254 .ident = "ASUS EeeBook X205TA",
255 .matches = {
256 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
257 DMI_MATCH(DMI_PRODUCT_NAME, "X205TA"),
258 },
259 },
260 { /* Handle problems with rebooting on ASUS EeeBook X205TAW */
261 .callback = set_acpi_reboot,
262 .ident = "ASUS EeeBook X205TAW",
263 .matches = {
264 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
265 DMI_MATCH(DMI_PRODUCT_NAME, "X205TAW"),
266 },
267 },
268
269 /* Certec */
270 { /* Handle problems with rebooting on Certec BPC600 */
271 .callback = set_pci_reboot,
272 .ident = "Certec BPC600",
273 .matches = {
274 DMI_MATCH(DMI_SYS_VENDOR, "Certec"),
275 DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"),
276 },
277 },
278
279 /* Dell */
280 { /* Handle problems with rebooting on Dell DXP061 */
281 .callback = set_bios_reboot,
282 .ident = "Dell DXP061",
283 .matches = {
284 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
285 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
286 },
287 },
288 { /* Handle problems with rebooting on Dell E520's */
289 .callback = set_bios_reboot,
290 .ident = "Dell E520",
291 .matches = {
292 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
293 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
294 },
295 },
296 { /* Handle problems with rebooting on the Latitude E5410. */
297 .callback = set_pci_reboot,
298 .ident = "Dell Latitude E5410",
299 .matches = {
300 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
301 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"),
302 },
303 },
304 { /* Handle problems with rebooting on the Latitude E5420. */
305 .callback = set_pci_reboot,
306 .ident = "Dell Latitude E5420",
307 .matches = {
308 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
309 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
310 },
311 },
312 { /* Handle problems with rebooting on the Latitude E6320. */
313 .callback = set_pci_reboot,
314 .ident = "Dell Latitude E6320",
315 .matches = {
316 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
317 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
318 },
319 },
320 { /* Handle problems with rebooting on the Latitude E6420. */
321 .callback = set_pci_reboot,
322 .ident = "Dell Latitude E6420",
323 .matches = {
324 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
325 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
326 },
327 },
328 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
329 .callback = set_bios_reboot,
330 .ident = "Dell OptiPlex 330",
331 .matches = {
332 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
333 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
334 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
335 },
336 },
337 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
338 .callback = set_bios_reboot,
339 .ident = "Dell OptiPlex 360",
340 .matches = {
341 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
342 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
343 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
344 },
345 },
346 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */
347 .callback = set_bios_reboot,
348 .ident = "Dell OptiPlex 745",
349 .matches = {
350 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
351 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
352 },
353 },
354 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */
355 .callback = set_bios_reboot,
356 .ident = "Dell OptiPlex 745",
357 .matches = {
358 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
359 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
360 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
361 },
362 },
363 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
364 .callback = set_bios_reboot,
365 .ident = "Dell OptiPlex 745",
366 .matches = {
367 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
368 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
369 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
370 },
371 },
372 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
373 .callback = set_bios_reboot,
374 .ident = "Dell OptiPlex 760",
375 .matches = {
376 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
377 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
378 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
379 },
380 },
381 { /* Handle problems with rebooting on the OptiPlex 990. */
382 .callback = set_pci_reboot,
383 .ident = "Dell OptiPlex 990",
384 .matches = {
385 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
386 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
387 },
388 },
389 { /* Handle problems with rebooting on Dell 300's */
390 .callback = set_bios_reboot,
391 .ident = "Dell PowerEdge 300",
392 .matches = {
393 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
394 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
395 },
396 },
397 { /* Handle problems with rebooting on Dell 1300's */
398 .callback = set_bios_reboot,
399 .ident = "Dell PowerEdge 1300",
400 .matches = {
401 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
402 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
403 },
404 },
405 { /* Handle problems with rebooting on Dell 2400's */
406 .callback = set_bios_reboot,
407 .ident = "Dell PowerEdge 2400",
408 .matches = {
409 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
410 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
411 },
412 },
413 { /* Handle problems with rebooting on the Dell PowerEdge C6100. */
414 .callback = set_pci_reboot,
415 .ident = "Dell PowerEdge C6100",
416 .matches = {
417 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
418 DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
419 },
420 },
421 { /* Handle problems with rebooting on the Precision M6600. */
422 .callback = set_pci_reboot,
423 .ident = "Dell Precision M6600",
424 .matches = {
425 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
426 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
427 },
428 },
429 { /* Handle problems with rebooting on Dell T5400's */
430 .callback = set_bios_reboot,
431 .ident = "Dell Precision T5400",
432 .matches = {
433 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
434 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
435 },
436 },
437 { /* Handle problems with rebooting on Dell T7400's */
438 .callback = set_bios_reboot,
439 .ident = "Dell Precision T7400",
440 .matches = {
441 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
442 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
443 },
444 },
445 { /* Handle problems with rebooting on Dell XPS710 */
446 .callback = set_bios_reboot,
447 .ident = "Dell XPS710",
448 .matches = {
449 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
450 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
451 },
452 },
453 { /* Handle problems with rebooting on Dell Optiplex 7450 AIO */
454 .callback = set_acpi_reboot,
455 .ident = "Dell OptiPlex 7450 AIO",
456 .matches = {
457 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
458 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7450 AIO"),
459 },
460 },
461
462 /* Hewlett-Packard */
463 { /* Handle problems with rebooting on HP laptops */
464 .callback = set_bios_reboot,
465 .ident = "HP Compaq Laptop",
466 .matches = {
467 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
468 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
469 },
470 },
471
472 /* Sony */
473 { /* Handle problems with rebooting on Sony VGN-Z540N */
474 .callback = set_bios_reboot,
475 .ident = "Sony VGN-Z540N",
476 .matches = {
477 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
478 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
479 },
480 },
481
482 { }
483};
484
485static int __init reboot_init(void)
486{
487 int rv;
488
489 /*
490 * Only do the DMI check if reboot_type hasn't been overridden
491 * on the command line
492 */
493 if (!reboot_default)
494 return 0;
495
496 /*
497 * The DMI quirks table takes precedence. If no quirks entry
498 * matches and the ACPI Hardware Reduced bit is set and EFI
499 * runtime services are enabled, force EFI reboot.
500 */
501 rv = dmi_check_system(reboot_dmi_table);
502
503 if (!rv && efi_reboot_required() && !efi_runtime_disabled())
504 reboot_type = BOOT_EFI;
505
506 return 0;
507}
508core_initcall(reboot_init);
509
510static inline void kb_wait(void)
511{
512 int i;
513
514 for (i = 0; i < 0x10000; i++) {
515 if ((inb(0x64) & 0x02) == 0)
516 break;
517 udelay(2);
518 }
519}
520
521static void vmxoff_nmi(int cpu, struct pt_regs *regs)
522{
523 cpu_emergency_vmxoff();
524}
525
526/* Use NMIs as IPIs to tell all CPUs to disable virtualization */
527static void emergency_vmx_disable_all(void)
528{
529 /* Just make sure we won't change CPUs while doing this */
530 local_irq_disable();
531
532 /*
533 * We need to disable VMX on all CPUs before rebooting, otherwise
534 * we risk hanging up the machine, because the CPU ignore INIT
535 * signals when VMX is enabled.
536 *
537 * We can't take any locks and we may be on an inconsistent
538 * state, so we use NMIs as IPIs to tell the other CPUs to disable
539 * VMX and halt.
540 *
541 * For safety, we will avoid running the nmi_shootdown_cpus()
542 * stuff unnecessarily, but we don't have a way to check
543 * if other CPUs have VMX enabled. So we will call it only if the
544 * CPU we are running on has VMX enabled.
545 *
546 * We will miss cases where VMX is not enabled on all CPUs. This
547 * shouldn't do much harm because KVM always enable VMX on all
548 * CPUs anyway. But we can miss it on the small window where KVM
549 * is still enabling VMX.
550 */
551 if (cpu_has_vmx() && cpu_vmx_enabled()) {
552 /* Disable VMX on this CPU. */
553 cpu_vmxoff();
554
555 /* Halt and disable VMX on the other CPUs */
556 nmi_shootdown_cpus(vmxoff_nmi);
557
558 }
559}
560
561
562void __attribute__((weak)) mach_reboot_fixups(void)
563{
564}
565
566/*
567 * To the best of our knowledge Windows compatible x86 hardware expects
568 * the following on reboot:
569 *
570 * 1) If the FADT has the ACPI reboot register flag set, try it
571 * 2) If still alive, write to the keyboard controller
572 * 3) If still alive, write to the ACPI reboot register again
573 * 4) If still alive, write to the keyboard controller again
574 * 5) If still alive, call the EFI runtime service to reboot
575 * 6) If no EFI runtime service, call the BIOS to do a reboot
576 *
577 * We default to following the same pattern. We also have
578 * two other reboot methods: 'triple fault' and 'PCI', which
579 * can be triggered via the reboot= kernel boot option or
580 * via quirks.
581 *
582 * This means that this function can never return, it can misbehave
583 * by not rebooting properly and hanging.
584 */
585static void native_machine_emergency_restart(void)
586{
587 int i;
588 int attempt = 0;
589 int orig_reboot_type = reboot_type;
590 unsigned short mode;
591
592 if (reboot_emergency)
593 emergency_vmx_disable_all();
594
595 tboot_shutdown(TB_SHUTDOWN_REBOOT);
596
597 /* Tell the BIOS if we want cold or warm reboot */
598 mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
599 *((unsigned short *)__va(0x472)) = mode;
600
601 /*
602 * If an EFI capsule has been registered with the firmware then
603 * override the reboot= parameter.
604 */
605 if (efi_capsule_pending(NULL)) {
606 pr_info("EFI capsule is pending, forcing EFI reboot.\n");
607 reboot_type = BOOT_EFI;
608 }
609
610 for (;;) {
611 /* Could also try the reset bit in the Hammer NB */
612 switch (reboot_type) {
613 case BOOT_ACPI:
614 acpi_reboot();
615 reboot_type = BOOT_KBD;
616 break;
617
618 case BOOT_KBD:
619 mach_reboot_fixups(); /* For board specific fixups */
620
621 for (i = 0; i < 10; i++) {
622 kb_wait();
623 udelay(50);
624 outb(0xfe, 0x64); /* Pulse reset low */
625 udelay(50);
626 }
627 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
628 attempt = 1;
629 reboot_type = BOOT_ACPI;
630 } else {
631 reboot_type = BOOT_EFI;
632 }
633 break;
634
635 case BOOT_EFI:
636 efi_reboot(reboot_mode, NULL);
637 reboot_type = BOOT_BIOS;
638 break;
639
640 case BOOT_BIOS:
641 machine_real_restart(MRR_BIOS);
642
643 /* We're probably dead after this, but... */
644 reboot_type = BOOT_CF9_SAFE;
645 break;
646
647 case BOOT_CF9_FORCE:
648 port_cf9_safe = true;
649 /* Fall through */
650
651 case BOOT_CF9_SAFE:
652 if (port_cf9_safe) {
653 u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E;
654 u8 cf9 = inb(0xcf9) & ~reboot_code;
655 outb(cf9|2, 0xcf9); /* Request hard reset */
656 udelay(50);
657 /* Actually do the reset */
658 outb(cf9|reboot_code, 0xcf9);
659 udelay(50);
660 }
661 reboot_type = BOOT_TRIPLE;
662 break;
663
664 case BOOT_TRIPLE:
665 idt_invalidate(NULL);
666 __asm__ __volatile__("int3");
667
668 /* We're probably dead after this, but... */
669 reboot_type = BOOT_KBD;
670 break;
671 }
672 }
673}
674
675void native_machine_shutdown(void)
676{
677 /* Stop the cpus and apics */
678#ifdef CONFIG_X86_IO_APIC
679 /*
680 * Disabling IO APIC before local APIC is a workaround for
681 * erratum AVR31 in "Intel Atom Processor C2000 Product Family
682 * Specification Update". In this situation, interrupts that target
683 * a Logical Processor whose Local APIC is either in the process of
684 * being hardware disabled or software disabled are neither delivered
685 * nor discarded. When this erratum occurs, the processor may hang.
686 *
687 * Even without the erratum, it still makes sense to quiet IO APIC
688 * before disabling Local APIC.
689 */
690 clear_IO_APIC();
691#endif
692
693#ifdef CONFIG_SMP
694 /*
695 * Stop all of the others. Also disable the local irq to
696 * not receive the per-cpu timer interrupt which may trigger
697 * scheduler's load balance.
698 */
699 local_irq_disable();
700 stop_other_cpus();
701#endif
702
703 lapic_shutdown();
704 restore_boot_irq_mode();
705
706#ifdef CONFIG_HPET_TIMER
707 hpet_disable();
708#endif
709
710#ifdef CONFIG_X86_64
711 x86_platform.iommu_shutdown();
712#endif
713}
714
715static void __machine_emergency_restart(int emergency)
716{
717 reboot_emergency = emergency;
718 machine_ops.emergency_restart();
719}
720
721static void native_machine_restart(char *__unused)
722{
723 pr_notice("machine restart\n");
724
725 if (!reboot_force)
726 machine_shutdown();
727 __machine_emergency_restart(0);
728}
729
730static void native_machine_halt(void)
731{
732 /* Stop other cpus and apics */
733 machine_shutdown();
734
735 tboot_shutdown(TB_SHUTDOWN_HALT);
736
737 stop_this_cpu(NULL);
738}
739
740static void native_machine_power_off(void)
741{
742 if (pm_power_off) {
743 if (!reboot_force)
744 machine_shutdown();
745 pm_power_off();
746 }
747 /* A fallback in case there is no PM info available */
748 tboot_shutdown(TB_SHUTDOWN_HALT);
749}
750
751struct machine_ops machine_ops __ro_after_init = {
752 .power_off = native_machine_power_off,
753 .shutdown = native_machine_shutdown,
754 .emergency_restart = native_machine_emergency_restart,
755 .restart = native_machine_restart,
756 .halt = native_machine_halt,
757#ifdef CONFIG_KEXEC_CORE
758 .crash_shutdown = native_machine_crash_shutdown,
759#endif
760};
761
762void machine_power_off(void)
763{
764 machine_ops.power_off();
765}
766
767void machine_shutdown(void)
768{
769 machine_ops.shutdown();
770}
771
772void machine_emergency_restart(void)
773{
774 __machine_emergency_restart(1);
775}
776
777void machine_restart(char *cmd)
778{
779 machine_ops.restart(cmd);
780}
781
782void machine_halt(void)
783{
784 machine_ops.halt();
785}
786
787#ifdef CONFIG_KEXEC_CORE
788void machine_crash_shutdown(struct pt_regs *regs)
789{
790 machine_ops.crash_shutdown(regs);
791}
792#endif
793
794
795/* This is the CPU performing the emergency shutdown work. */
796int crashing_cpu = -1;
797
798#if defined(CONFIG_SMP)
799
800static nmi_shootdown_cb shootdown_callback;
801
802static atomic_t waiting_for_crash_ipi;
803static int crash_ipi_issued;
804
805static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
806{
807 int cpu;
808
809 cpu = raw_smp_processor_id();
810
811 /*
812 * Don't do anything if this handler is invoked on crashing cpu.
813 * Otherwise, system will completely hang. Crashing cpu can get
814 * an NMI if system was initially booted with nmi_watchdog parameter.
815 */
816 if (cpu == crashing_cpu)
817 return NMI_HANDLED;
818 local_irq_disable();
819
820 shootdown_callback(cpu, regs);
821
822 atomic_dec(&waiting_for_crash_ipi);
823 /* Assume hlt works */
824 halt();
825 for (;;)
826 cpu_relax();
827
828 return NMI_HANDLED;
829}
830
831/*
832 * Halt all other CPUs, calling the specified function on each of them
833 *
834 * This function can be used to halt all other CPUs on crash
835 * or emergency reboot time. The function passed as parameter
836 * will be called inside a NMI handler on all CPUs.
837 */
838void nmi_shootdown_cpus(nmi_shootdown_cb callback)
839{
840 unsigned long msecs;
841 local_irq_disable();
842
843 /* Make a note of crashing cpu. Will be used in NMI callback. */
844 crashing_cpu = safe_smp_processor_id();
845
846 shootdown_callback = callback;
847
848 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
849 /* Would it be better to replace the trap vector here? */
850 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
851 NMI_FLAG_FIRST, "crash"))
852 return; /* Return what? */
853 /*
854 * Ensure the new callback function is set before sending
855 * out the NMI
856 */
857 wmb();
858
859 apic_send_IPI_allbutself(NMI_VECTOR);
860
861 /* Kick CPUs looping in NMI context. */
862 WRITE_ONCE(crash_ipi_issued, 1);
863
864 msecs = 1000; /* Wait at most a second for the other cpus to stop */
865 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
866 mdelay(1);
867 msecs--;
868 }
869
870 /* Leave the nmi callback set */
871}
872
873/*
874 * Check if the crash dumping IPI got issued and if so, call its callback
875 * directly. This function is used when we have already been in NMI handler.
876 * It doesn't return.
877 */
878void run_crash_ipi_callback(struct pt_regs *regs)
879{
880 if (crash_ipi_issued)
881 crash_nmi_callback(0, regs);
882}
883
884/* Override the weak function in kernel/panic.c */
885void nmi_panic_self_stop(struct pt_regs *regs)
886{
887 while (1) {
888 /* If no CPU is preparing crash dump, we simply loop here. */
889 run_crash_ipi_callback(regs);
890 cpu_relax();
891 }
892}
893
894#else /* !CONFIG_SMP */
895void nmi_shootdown_cpus(nmi_shootdown_cb callback)
896{
897 /* No other CPUs to shoot down */
898}
899
900void run_crash_ipi_callback(struct pt_regs *regs)
901{
902}
903#endif
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