iommu/amd: Don't use MSI address range for DMA addresses
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / x86 / kernel / reboot.c
blob807e3c98bbbfe622e99301b31dde1102c186ae35
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 <acpi/reboot.h>
10 #include <asm/io.h>
11 #include <asm/apic.h>
12 #include <asm/desc.h>
13 #include <asm/hpet.h>
14 #include <asm/pgtable.h>
15 #include <asm/proto.h>
16 #include <asm/reboot_fixups.h>
17 #include <asm/reboot.h>
18 #include <asm/pci_x86.h>
19 #include <asm/virtext.h>
20 #include <asm/cpu.h>
22 #ifdef CONFIG_X86_32
23 # include <linux/ctype.h>
24 # include <linux/mc146818rtc.h>
25 #else
26 # include <asm/x86_init.h>
27 #endif
30 * Power off function, if any
32 void (*pm_power_off)(void);
33 EXPORT_SYMBOL(pm_power_off);
35 static const struct desc_ptr no_idt = {};
36 static int reboot_mode;
37 enum reboot_type reboot_type = BOOT_KBD;
38 int reboot_force;
40 #if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
41 static int reboot_cpu = -1;
42 #endif
44 /* This is set if we need to go through the 'emergency' path.
45 * When machine_emergency_restart() is called, we may be on
46 * an inconsistent state and won't be able to do a clean cleanup
48 static int reboot_emergency;
50 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */
51 bool port_cf9_safe = false;
53 /* reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
54 warm Don't set the cold reboot flag
55 cold Set the cold reboot flag
56 bios Reboot by jumping through the BIOS (only for X86_32)
57 smp Reboot by executing reset on BSP or other CPU (only for X86_32)
58 triple Force a triple fault (init)
59 kbd Use the keyboard controller. cold reset (default)
60 acpi Use the RESET_REG in the FADT
61 efi Use efi reset_system runtime service
62 pci Use the so-called "PCI reset register", CF9
63 force Avoid anything that could hang.
65 static int __init reboot_setup(char *str)
67 for (;;) {
68 switch (*str) {
69 case 'w':
70 reboot_mode = 0x1234;
71 break;
73 case 'c':
74 reboot_mode = 0;
75 break;
77 #ifdef CONFIG_X86_32
78 #ifdef CONFIG_SMP
79 case 's':
80 if (isdigit(*(str+1))) {
81 reboot_cpu = (int) (*(str+1) - '0');
82 if (isdigit(*(str+2)))
83 reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0');
85 /* we will leave sorting out the final value
86 when we are ready to reboot, since we might not
87 have set up boot_cpu_id or smp_num_cpu */
88 break;
89 #endif /* CONFIG_SMP */
91 case 'b':
92 #endif
93 case 'a':
94 case 'k':
95 case 't':
96 case 'e':
97 case 'p':
98 reboot_type = *str;
99 break;
101 case 'f':
102 reboot_force = 1;
103 break;
106 str = strchr(str, ',');
107 if (str)
108 str++;
109 else
110 break;
112 return 1;
115 __setup("reboot=", reboot_setup);
118 #ifdef CONFIG_X86_32
120 * Reboot options and system auto-detection code provided by
121 * Dell Inc. so their systems "just work". :-)
125 * Some machines require the "reboot=b" commandline option,
126 * this quirk makes that automatic.
128 static int __init set_bios_reboot(const struct dmi_system_id *d)
130 if (reboot_type != BOOT_BIOS) {
131 reboot_type = BOOT_BIOS;
132 printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident);
134 return 0;
137 static struct dmi_system_id __initdata reboot_dmi_table[] = {
138 { /* Handle problems with rebooting on Dell E520's */
139 .callback = set_bios_reboot,
140 .ident = "Dell E520",
141 .matches = {
142 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
143 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
146 { /* Handle problems with rebooting on Dell 1300's */
147 .callback = set_bios_reboot,
148 .ident = "Dell PowerEdge 1300",
149 .matches = {
150 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
151 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
154 { /* Handle problems with rebooting on Dell 300's */
155 .callback = set_bios_reboot,
156 .ident = "Dell PowerEdge 300",
157 .matches = {
158 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
159 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
162 { /* Handle problems with rebooting on Dell Optiplex 745's SFF*/
163 .callback = set_bios_reboot,
164 .ident = "Dell OptiPlex 745",
165 .matches = {
166 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
167 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
170 { /* Handle problems with rebooting on Dell Optiplex 745's DFF*/
171 .callback = set_bios_reboot,
172 .ident = "Dell OptiPlex 745",
173 .matches = {
174 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
175 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
176 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
179 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
180 .callback = set_bios_reboot,
181 .ident = "Dell OptiPlex 745",
182 .matches = {
183 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
184 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
185 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
188 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
189 .callback = set_bios_reboot,
190 .ident = "Dell OptiPlex 330",
191 .matches = {
192 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
193 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
194 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
197 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
198 .callback = set_bios_reboot,
199 .ident = "Dell OptiPlex 360",
200 .matches = {
201 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
202 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
203 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
206 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G*/
207 .callback = set_bios_reboot,
208 .ident = "Dell OptiPlex 760",
209 .matches = {
210 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
211 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
212 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
215 { /* Handle problems with rebooting on Dell 2400's */
216 .callback = set_bios_reboot,
217 .ident = "Dell PowerEdge 2400",
218 .matches = {
219 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
220 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
223 { /* Handle problems with rebooting on Dell T5400's */
224 .callback = set_bios_reboot,
225 .ident = "Dell Precision T5400",
226 .matches = {
227 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
228 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
231 { /* Handle problems with rebooting on Dell T7400's */
232 .callback = set_bios_reboot,
233 .ident = "Dell Precision T7400",
234 .matches = {
235 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
236 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
239 { /* Handle problems with rebooting on HP laptops */
240 .callback = set_bios_reboot,
241 .ident = "HP Compaq Laptop",
242 .matches = {
243 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
244 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
247 { /* Handle problems with rebooting on Dell XPS710 */
248 .callback = set_bios_reboot,
249 .ident = "Dell XPS710",
250 .matches = {
251 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
252 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
255 { /* Handle problems with rebooting on Dell DXP061 */
256 .callback = set_bios_reboot,
257 .ident = "Dell DXP061",
258 .matches = {
259 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
260 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
263 { /* Handle problems with rebooting on Sony VGN-Z540N */
264 .callback = set_bios_reboot,
265 .ident = "Sony VGN-Z540N",
266 .matches = {
267 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
268 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
271 { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */
272 .callback = set_bios_reboot,
273 .ident = "CompuLab SBC-FITPC2",
274 .matches = {
275 DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"),
276 DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"),
279 { /* Handle problems with rebooting on ASUS P4S800 */
280 .callback = set_bios_reboot,
281 .ident = "ASUS P4S800",
282 .matches = {
283 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
284 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
290 static int __init reboot_init(void)
292 dmi_check_system(reboot_dmi_table);
293 return 0;
295 core_initcall(reboot_init);
297 /* The following code and data reboots the machine by switching to real
298 mode and jumping to the BIOS reset entry point, as if the CPU has
299 really been reset. The previous version asked the keyboard
300 controller to pulse the CPU reset line, which is more thorough, but
301 doesn't work with at least one type of 486 motherboard. It is easy
302 to stop this code working; hence the copious comments. */
303 static const unsigned long long
304 real_mode_gdt_entries [3] =
306 0x0000000000000000ULL, /* Null descriptor */
307 0x00009b000000ffffULL, /* 16-bit real-mode 64k code at 0x00000000 */
308 0x000093000100ffffULL /* 16-bit real-mode 64k data at 0x00000100 */
311 static const struct desc_ptr
312 real_mode_gdt = { sizeof (real_mode_gdt_entries) - 1, (long)real_mode_gdt_entries },
313 real_mode_idt = { 0x3ff, 0 };
315 /* This is 16-bit protected mode code to disable paging and the cache,
316 switch to real mode and jump to the BIOS reset code.
318 The instruction that switches to real mode by writing to CR0 must be
319 followed immediately by a far jump instruction, which set CS to a
320 valid value for real mode, and flushes the prefetch queue to avoid
321 running instructions that have already been decoded in protected
322 mode.
324 Clears all the flags except ET, especially PG (paging), PE
325 (protected-mode enable) and TS (task switch for coprocessor state
326 save). Flushes the TLB after paging has been disabled. Sets CD and
327 NW, to disable the cache on a 486, and invalidates the cache. This
328 is more like the state of a 486 after reset. I don't know if
329 something else should be done for other chips.
331 More could be done here to set up the registers as if a CPU reset had
332 occurred; hopefully real BIOSs don't assume much. */
333 static const unsigned char real_mode_switch [] =
335 0x66, 0x0f, 0x20, 0xc0, /* movl %cr0,%eax */
336 0x66, 0x83, 0xe0, 0x11, /* andl $0x00000011,%eax */
337 0x66, 0x0d, 0x00, 0x00, 0x00, 0x60, /* orl $0x60000000,%eax */
338 0x66, 0x0f, 0x22, 0xc0, /* movl %eax,%cr0 */
339 0x66, 0x0f, 0x22, 0xd8, /* movl %eax,%cr3 */
340 0x66, 0x0f, 0x20, 0xc3, /* movl %cr0,%ebx */
341 0x66, 0x81, 0xe3, 0x00, 0x00, 0x00, 0x60, /* andl $0x60000000,%ebx */
342 0x74, 0x02, /* jz f */
343 0x0f, 0x09, /* wbinvd */
344 0x24, 0x10, /* f: andb $0x10,al */
345 0x66, 0x0f, 0x22, 0xc0 /* movl %eax,%cr0 */
347 static const unsigned char jump_to_bios [] =
349 0xea, 0x00, 0x00, 0xff, 0xff /* ljmp $0xffff,$0x0000 */
353 * Switch to real mode and then execute the code
354 * specified by the code and length parameters.
355 * We assume that length will aways be less that 100!
357 void machine_real_restart(const unsigned char *code, int length)
359 local_irq_disable();
361 /* Write zero to CMOS register number 0x0f, which the BIOS POST
362 routine will recognize as telling it to do a proper reboot. (Well
363 that's what this book in front of me says -- it may only apply to
364 the Phoenix BIOS though, it's not clear). At the same time,
365 disable NMIs by setting the top bit in the CMOS address register,
366 as we're about to do peculiar things to the CPU. I'm not sure if
367 `outb_p' is needed instead of just `outb'. Use it to be on the
368 safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
370 spin_lock(&rtc_lock);
371 CMOS_WRITE(0x00, 0x8f);
372 spin_unlock(&rtc_lock);
374 /* Remap the kernel at virtual address zero, as well as offset zero
375 from the kernel segment. This assumes the kernel segment starts at
376 virtual address PAGE_OFFSET. */
377 memcpy(swapper_pg_dir, swapper_pg_dir + KERNEL_PGD_BOUNDARY,
378 sizeof(swapper_pg_dir [0]) * KERNEL_PGD_PTRS);
381 * Use `swapper_pg_dir' as our page directory.
383 load_cr3(swapper_pg_dir);
385 /* Write 0x1234 to absolute memory location 0x472. The BIOS reads
386 this on booting to tell it to "Bypass memory test (also warm
387 boot)". This seems like a fairly standard thing that gets set by
388 REBOOT.COM programs, and the previous reset routine did this
389 too. */
390 *((unsigned short *)0x472) = reboot_mode;
392 /* For the switch to real mode, copy some code to low memory. It has
393 to be in the first 64k because it is running in 16-bit mode, and it
394 has to have the same physical and virtual address, because it turns
395 off paging. Copy it near the end of the first page, out of the way
396 of BIOS variables. */
397 memcpy((void *)(0x1000 - sizeof(real_mode_switch) - 100),
398 real_mode_switch, sizeof (real_mode_switch));
399 memcpy((void *)(0x1000 - 100), code, length);
401 /* Set up the IDT for real mode. */
402 load_idt(&real_mode_idt);
404 /* Set up a GDT from which we can load segment descriptors for real
405 mode. The GDT is not used in real mode; it is just needed here to
406 prepare the descriptors. */
407 load_gdt(&real_mode_gdt);
409 /* Load the data segment registers, and thus the descriptors ready for
410 real mode. The base address of each segment is 0x100, 16 times the
411 selector value being loaded here. This is so that the segment
412 registers don't have to be reloaded after switching to real mode:
413 the values are consistent for real mode operation already. */
414 __asm__ __volatile__ ("movl $0x0010,%%eax\n"
415 "\tmovl %%eax,%%ds\n"
416 "\tmovl %%eax,%%es\n"
417 "\tmovl %%eax,%%fs\n"
418 "\tmovl %%eax,%%gs\n"
419 "\tmovl %%eax,%%ss" : : : "eax");
421 /* Jump to the 16-bit code that we copied earlier. It disables paging
422 and the cache, switches to real mode, and jumps to the BIOS reset
423 entry point. */
424 __asm__ __volatile__ ("ljmp $0x0008,%0"
426 : "i" ((void *)(0x1000 - sizeof (real_mode_switch) - 100)));
428 #ifdef CONFIG_APM_MODULE
429 EXPORT_SYMBOL(machine_real_restart);
430 #endif
432 #endif /* CONFIG_X86_32 */
435 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
437 static int __init set_pci_reboot(const struct dmi_system_id *d)
439 if (reboot_type != BOOT_CF9) {
440 reboot_type = BOOT_CF9;
441 printk(KERN_INFO "%s series board detected. "
442 "Selecting PCI-method for reboots.\n", d->ident);
444 return 0;
447 static struct dmi_system_id __initdata pci_reboot_dmi_table[] = {
448 { /* Handle problems with rebooting on Apple MacBook5 */
449 .callback = set_pci_reboot,
450 .ident = "Apple MacBook5",
451 .matches = {
452 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
453 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
456 { /* Handle problems with rebooting on Apple MacBookPro5 */
457 .callback = set_pci_reboot,
458 .ident = "Apple MacBookPro5",
459 .matches = {
460 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
461 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
464 { /* Handle problems with rebooting on Apple Macmini3,1 */
465 .callback = set_pci_reboot,
466 .ident = "Apple Macmini3,1",
467 .matches = {
468 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
469 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
472 { /* Handle problems with rebooting on the iMac9,1. */
473 .callback = set_pci_reboot,
474 .ident = "Apple iMac9,1",
475 .matches = {
476 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
477 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
480 { /* Handle problems with rebooting on the Latitude E5420. */
481 .callback = set_pci_reboot,
482 .ident = "Dell Latitude E5420",
483 .matches = {
484 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
485 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
488 { /* Handle problems with rebooting on the Latitude E6420. */
489 .callback = set_pci_reboot,
490 .ident = "Dell Latitude E6420",
491 .matches = {
492 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
493 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
499 static int __init pci_reboot_init(void)
501 dmi_check_system(pci_reboot_dmi_table);
502 return 0;
504 core_initcall(pci_reboot_init);
506 static inline void kb_wait(void)
508 int i;
510 for (i = 0; i < 0x10000; i++) {
511 if ((inb(0x64) & 0x02) == 0)
512 break;
513 udelay(2);
517 static void vmxoff_nmi(int cpu, struct die_args *args)
519 cpu_emergency_vmxoff();
522 /* Use NMIs as IPIs to tell all CPUs to disable virtualization
524 static void emergency_vmx_disable_all(void)
526 /* Just make sure we won't change CPUs while doing this */
527 local_irq_disable();
529 /* We need to disable VMX on all CPUs before rebooting, otherwise
530 * we risk hanging up the machine, because the CPU ignore INIT
531 * signals when VMX is enabled.
533 * We can't take any locks and we may be on an inconsistent
534 * state, so we use NMIs as IPIs to tell the other CPUs to disable
535 * VMX and halt.
537 * For safety, we will avoid running the nmi_shootdown_cpus()
538 * stuff unnecessarily, but we don't have a way to check
539 * if other CPUs have VMX enabled. So we will call it only if the
540 * CPU we are running on has VMX enabled.
542 * We will miss cases where VMX is not enabled on all CPUs. This
543 * shouldn't do much harm because KVM always enable VMX on all
544 * CPUs anyway. But we can miss it on the small window where KVM
545 * is still enabling VMX.
547 if (cpu_has_vmx() && cpu_vmx_enabled()) {
548 /* Disable VMX on this CPU.
550 cpu_vmxoff();
552 /* Halt and disable VMX on the other CPUs */
553 nmi_shootdown_cpus(vmxoff_nmi);
559 void __attribute__((weak)) mach_reboot_fixups(void)
563 static void native_machine_emergency_restart(void)
565 int i;
567 if (reboot_emergency)
568 emergency_vmx_disable_all();
570 tboot_shutdown(TB_SHUTDOWN_REBOOT);
572 /* Tell the BIOS if we want cold or warm reboot */
573 *((unsigned short *)__va(0x472)) = reboot_mode;
575 for (;;) {
576 /* Could also try the reset bit in the Hammer NB */
577 switch (reboot_type) {
578 case BOOT_KBD:
579 mach_reboot_fixups(); /* for board specific fixups */
581 for (i = 0; i < 10; i++) {
582 kb_wait();
583 udelay(50);
584 outb(0xfe, 0x64); /* pulse reset low */
585 udelay(50);
588 case BOOT_TRIPLE:
589 load_idt(&no_idt);
590 __asm__ __volatile__("int3");
592 reboot_type = BOOT_KBD;
593 break;
595 #ifdef CONFIG_X86_32
596 case BOOT_BIOS:
597 machine_real_restart(jump_to_bios, sizeof(jump_to_bios));
599 reboot_type = BOOT_KBD;
600 break;
601 #endif
603 case BOOT_ACPI:
604 acpi_reboot();
605 reboot_type = BOOT_KBD;
606 break;
608 case BOOT_EFI:
609 if (efi_enabled)
610 efi.reset_system(reboot_mode ?
611 EFI_RESET_WARM :
612 EFI_RESET_COLD,
613 EFI_SUCCESS, 0, NULL);
614 reboot_type = BOOT_KBD;
615 break;
617 case BOOT_CF9:
618 port_cf9_safe = true;
619 /* fall through */
621 case BOOT_CF9_COND:
622 if (port_cf9_safe) {
623 u8 cf9 = inb(0xcf9) & ~6;
624 outb(cf9|2, 0xcf9); /* Request hard reset */
625 udelay(50);
626 outb(cf9|6, 0xcf9); /* Actually do the reset */
627 udelay(50);
629 reboot_type = BOOT_KBD;
630 break;
635 void native_machine_shutdown(void)
637 /* Stop the cpus and apics */
638 #ifdef CONFIG_SMP
640 /* The boot cpu is always logical cpu 0 */
641 int reboot_cpu_id = 0;
643 #ifdef CONFIG_X86_32
644 /* See if there has been given a command line override */
645 if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
646 cpu_online(reboot_cpu))
647 reboot_cpu_id = reboot_cpu;
648 #endif
650 /* Make certain the cpu I'm about to reboot on is online */
651 if (!cpu_online(reboot_cpu_id))
652 reboot_cpu_id = smp_processor_id();
654 /* Make certain I only run on the appropriate processor */
655 set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
657 /* O.K Now that I'm on the appropriate processor,
658 * stop all of the others.
660 stop_other_cpus();
661 #endif
663 lapic_shutdown();
665 #ifdef CONFIG_X86_IO_APIC
666 disable_IO_APIC();
667 #endif
669 #ifdef CONFIG_HPET_TIMER
670 hpet_disable();
671 #endif
673 #ifdef CONFIG_X86_64
674 x86_platform.iommu_shutdown();
675 #endif
678 static void __machine_emergency_restart(int emergency)
680 reboot_emergency = emergency;
681 machine_ops.emergency_restart();
684 static void native_machine_restart(char *__unused)
686 printk("machine restart\n");
688 if (!reboot_force)
689 machine_shutdown();
690 __machine_emergency_restart(0);
693 static void native_machine_halt(void)
695 /* stop other cpus and apics */
696 machine_shutdown();
698 tboot_shutdown(TB_SHUTDOWN_HALT);
700 /* stop this cpu */
701 stop_this_cpu(NULL);
704 static void native_machine_power_off(void)
706 if (pm_power_off) {
707 if (!reboot_force)
708 machine_shutdown();
709 pm_power_off();
711 /* a fallback in case there is no PM info available */
712 tboot_shutdown(TB_SHUTDOWN_HALT);
715 struct machine_ops machine_ops = {
716 .power_off = native_machine_power_off,
717 .shutdown = native_machine_shutdown,
718 .emergency_restart = native_machine_emergency_restart,
719 .restart = native_machine_restart,
720 .halt = native_machine_halt,
721 #ifdef CONFIG_KEXEC
722 .crash_shutdown = native_machine_crash_shutdown,
723 #endif
726 void machine_power_off(void)
728 machine_ops.power_off();
731 void machine_shutdown(void)
733 machine_ops.shutdown();
736 void machine_emergency_restart(void)
738 __machine_emergency_restart(1);
741 void machine_restart(char *cmd)
743 machine_ops.restart(cmd);
746 void machine_halt(void)
748 machine_ops.halt();
751 #ifdef CONFIG_KEXEC
752 void machine_crash_shutdown(struct pt_regs *regs)
754 machine_ops.crash_shutdown(regs);
756 #endif
759 #if defined(CONFIG_SMP)
761 /* This keeps a track of which one is crashing cpu. */
762 static int crashing_cpu;
763 static nmi_shootdown_cb shootdown_callback;
765 static atomic_t waiting_for_crash_ipi;
767 static int crash_nmi_callback(struct notifier_block *self,
768 unsigned long val, void *data)
770 int cpu;
772 if (val != DIE_NMI_IPI)
773 return NOTIFY_OK;
775 cpu = raw_smp_processor_id();
777 /* Don't do anything if this handler is invoked on crashing cpu.
778 * Otherwise, system will completely hang. Crashing cpu can get
779 * an NMI if system was initially booted with nmi_watchdog parameter.
781 if (cpu == crashing_cpu)
782 return NOTIFY_STOP;
783 local_irq_disable();
785 shootdown_callback(cpu, (struct die_args *)data);
787 atomic_dec(&waiting_for_crash_ipi);
788 /* Assume hlt works */
789 halt();
790 for (;;)
791 cpu_relax();
793 return 1;
796 static void smp_send_nmi_allbutself(void)
798 apic->send_IPI_allbutself(NMI_VECTOR);
801 static struct notifier_block crash_nmi_nb = {
802 .notifier_call = crash_nmi_callback,
805 /* Halt all other CPUs, calling the specified function on each of them
807 * This function can be used to halt all other CPUs on crash
808 * or emergency reboot time. The function passed as parameter
809 * will be called inside a NMI handler on all CPUs.
811 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
813 unsigned long msecs;
814 local_irq_disable();
816 /* Make a note of crashing cpu. Will be used in NMI callback.*/
817 crashing_cpu = safe_smp_processor_id();
819 shootdown_callback = callback;
821 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
822 /* Would it be better to replace the trap vector here? */
823 if (register_die_notifier(&crash_nmi_nb))
824 return; /* return what? */
825 /* Ensure the new callback function is set before sending
826 * out the NMI
828 wmb();
830 smp_send_nmi_allbutself();
832 msecs = 1000; /* Wait at most a second for the other cpus to stop */
833 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
834 mdelay(1);
835 msecs--;
838 /* Leave the nmi callback set */
840 #else /* !CONFIG_SMP */
841 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
843 /* No other CPUs to shoot down */
845 #endif