arch/x86/kernel/reboot.c

   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  */
  34 void (*pm_power_off)(void);
  35 EXPORT_SYMBOL(pm_power_off);
  36
  37 static const struct desc_ptr no_idt = {};
  38 static int reboot_mode;
  39 enum reboot_type reboot_type = BOOT_ACPI;
  40 int reboot_force;
  41
  42 #if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
  43 static 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  */
  50 static int reboot_emergency;
  51
  52 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */
  53 bool 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  */
  67 static 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" or "reboot=k"  commandline options,
 128  * this quirk makes that automatic.
 129  */
 130 static 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
 139 static int __init set_kbd_reboot(const struct dmi_system_id *d)
 140 {
 141         if (reboot_type != BOOT_KBD) {
 142                 reboot_type = BOOT_KBD;
 143                 printk(KERN_INFO "%s series board detected. Selecting KBD-method for reboot.\n", d->ident);
 144         }
 145         return 0;
 146 }
 147
 148 static struct dmi_system_id __initdata reboot_dmi_table[] = {
 149         {       /* Handle problems with rebooting on Dell E520's */
 150                 .callback = set_bios_reboot,
 151                 .ident = "Dell E520",
 152                 .matches = {
 153                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 154                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
 155                 },
 156         },
 157         {       /* Handle problems with rebooting on Dell 1300's */
 158                 .callback = set_bios_reboot,
 159                 .ident = "Dell PowerEdge 1300",
 160                 .matches = {
 161                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 162                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
 163                 },
 164         },
 165         {       /* Handle problems with rebooting on Dell 300's */
 166                 .callback = set_bios_reboot,
 167                 .ident = "Dell PowerEdge 300",
 168                 .matches = {
 169                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 170                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
 171                 },
 172         },
 173         {       /* Handle problems with rebooting on Dell Optiplex 745's SFF*/
 174                 .callback = set_bios_reboot,
 175                 .ident = "Dell OptiPlex 745",
 176                 .matches = {
 177                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 178                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
 179                 },
 180         },
 181         {       /* Handle problems with rebooting on Dell Optiplex 745's DFF*/
 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, "0MM599"),
 188                 },
 189         },
 190         {       /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
 191                 .callback = set_bios_reboot,
 192                 .ident = "Dell OptiPlex 745",
 193                 .matches = {
 194                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 195                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
 196                         DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
 197                 },
 198         },
 199         {   /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
 200                 .callback = set_bios_reboot,
 201                 .ident = "Dell OptiPlex 330",
 202                 .matches = {
 203                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 204                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
 205                         DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
 206                 },
 207         },
 208         {   /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
 209                 .callback = set_bios_reboot,
 210                 .ident = "Dell OptiPlex 360",
 211                 .matches = {
 212                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 213                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
 214                         DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
 215                 },
 216         },
 217         {       /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G*/
 218                 .callback = set_bios_reboot,
 219                 .ident = "Dell OptiPlex 760",
 220                 .matches = {
 221                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 222                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
 223                         DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
 224                 },
 225         },
 226         {       /* Handle problems with rebooting on Dell 2400's */
 227                 .callback = set_bios_reboot,
 228                 .ident = "Dell PowerEdge 2400",
 229                 .matches = {
 230                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
 231                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
 232                 },
 233         },
 234         {       /* Handle problems with rebooting on Dell T5400's */
 235                 .callback = set_bios_reboot,
 236                 .ident = "Dell Precision T5400",
 237                 .matches = {
 238                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 239                         DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
 240                 },
 241         },
 242         {       /* Handle problems with rebooting on Dell T7400's */
 243                 .callback = set_bios_reboot,
 244                 .ident = "Dell Precision T7400",
 245                 .matches = {
 246                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 247                         DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
 248                 },
 249         },
 250         {       /* Handle problems with rebooting on HP laptops */
 251                 .callback = set_bios_reboot,
 252                 .ident = "HP Compaq Laptop",
 253                 .matches = {
 254                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 255                         DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
 256                 },
 257         },
 258         {       /* Handle problems with rebooting on Dell XPS710 */
 259                 .callback = set_bios_reboot,
 260                 .ident = "Dell XPS710",
 261                 .matches = {
 262                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 263                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
 264                 },
 265         },
 266         {       /* Handle problems with rebooting on Dell DXP061 */
 267                 .callback = set_bios_reboot,
 268                 .ident = "Dell DXP061",
 269                 .matches = {
 270                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 271                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
 272                 },
 273         },
 274         {       /* Handle problems with rebooting on Sony VGN-Z540N */
 275                 .callback = set_bios_reboot,
 276                 .ident = "Sony VGN-Z540N",
 277                 .matches = {
 278                         DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 279                         DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
 280                 },
 281         },
 282         {       /* Handle problems with rebooting on CompuLab SBC-FITPC2 */
 283                 .callback = set_bios_reboot,
 284                 .ident = "CompuLab SBC-FITPC2",
 285                 .matches = {
 286                         DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"),
 287                         DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"),
 288                 },
 289         },
 290         {       /* Handle problems with rebooting on ASUS P4S800 */
 291                 .callback = set_bios_reboot,
 292                 .ident = "ASUS P4S800",
 293                 .matches = {
 294                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 295                         DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
 296                 },
 297         },
 298         {       /* Handle problems with rebooting on VersaLogic Menlow boards */
 299                 .callback = set_bios_reboot,
 300                 .ident = "VersaLogic Menlow based board",
 301                 .matches = {
 302                         DMI_MATCH(DMI_BOARD_VENDOR, "VersaLogic Corporation"),
 303                         DMI_MATCH(DMI_BOARD_NAME, "VersaLogic Menlow board"),
 304                 },
 305         },
 306         { /* Handle reboot issue on Acer Aspire one */
 307                 .callback = set_kbd_reboot,
 308                 .ident = "Acer Aspire One A110",
 309                 .matches = {
 310                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 311                         DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
 312                 },
 313         },
 314         { }
 315 };
 316
 317 static int __init reboot_init(void)
 318 {
 319         dmi_check_system(reboot_dmi_table);
 320         return 0;
 321 }
 322 core_initcall(reboot_init);
 323
 324 extern const unsigned char machine_real_restart_asm[];
 325 extern const u64 machine_real_restart_gdt[3];
 326
 327 void machine_real_restart(unsigned int type)
 328 {
 329         void *restart_va;
 330         unsigned long restart_pa;
 331         void (*restart_lowmem)(unsigned int);
 332         u64 *lowmem_gdt;
 333
 334         local_irq_disable();
 335
 336         /* Write zero to CMOS register number 0x0f, which the BIOS POST
 337            routine will recognize as telling it to do a proper reboot.  (Well
 338            that's what this book in front of me says -- it may only apply to
 339            the Phoenix BIOS though, it's not clear).  At the same time,
 340            disable NMIs by setting the top bit in the CMOS address register,
 341            as we're about to do peculiar things to the CPU.  I'm not sure if
 342            `outb_p' is needed instead of just `outb'.  Use it to be on the
 343            safe side.  (Yes, CMOS_WRITE does outb_p's. -  Paul G.)
 344          */
 345         spin_lock(&rtc_lock);
 346         CMOS_WRITE(0x00, 0x8f);
 347         spin_unlock(&rtc_lock);
 348
 349         /*
 350          * Switch back to the initial page table.
 351          */
 352         load_cr3(initial_page_table);
 353
 354         /* Write 0x1234 to absolute memory location 0x472.  The BIOS reads
 355            this on booting to tell it to "Bypass memory test (also warm
 356            boot)".  This seems like a fairly standard thing that gets set by
 357            REBOOT.COM programs, and the previous reset routine did this
 358            too. */
 359         *((unsigned short *)0x472) = reboot_mode;
 360
 361         /* Patch the GDT in the low memory trampoline */
 362         lowmem_gdt = TRAMPOLINE_SYM(machine_real_restart_gdt);
 363
 364         restart_va = TRAMPOLINE_SYM(machine_real_restart_asm);
 365         restart_pa = virt_to_phys(restart_va);
 366         restart_lowmem = (void (*)(unsigned int))restart_pa;
 367
 368         /* GDT[0]: GDT self-pointer */
 369         lowmem_gdt[0] =
 370                 (u64)(sizeof(machine_real_restart_gdt) - 1) +
 371                 ((u64)virt_to_phys(lowmem_gdt) << 16);
 372         /* GDT[1]: 64K real mode code segment */
 373         lowmem_gdt[1] =
 374                 GDT_ENTRY(0x009b, restart_pa, 0xffff);
 375
 376         /* Jump to the identity-mapped low memory code */
 377         restart_lowmem(type);
 378 }
 379 #ifdef CONFIG_APM_MODULE
 380 EXPORT_SYMBOL(machine_real_restart);
 381 #endif
 382
 383 #endif /* CONFIG_X86_32 */
 384
 385 /*
 386  * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
 387  */
 388 static int __init set_pci_reboot(const struct dmi_system_id *d)
 389 {
 390         if (reboot_type != BOOT_CF9) {
 391                 reboot_type = BOOT_CF9;
 392                 printk(KERN_INFO "%s series board detected. "
 393                        "Selecting PCI-method for reboots.\n", d->ident);
 394         }
 395         return 0;
 396 }
 397
 398 static struct dmi_system_id __initdata pci_reboot_dmi_table[] = {
 399         {       /* Handle problems with rebooting on Apple MacBook5 */
 400                 .callback = set_pci_reboot,
 401                 .ident = "Apple MacBook5",
 402                 .matches = {
 403                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 404                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
 405                 },
 406         },
 407         {       /* Handle problems with rebooting on Apple MacBookPro5 */
 408                 .callback = set_pci_reboot,
 409                 .ident = "Apple MacBookPro5",
 410                 .matches = {
 411                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 412                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
 413                 },
 414         },
 415         {       /* Handle problems with rebooting on Apple Macmini3,1 */
 416                 .callback = set_pci_reboot,
 417                 .ident = "Apple Macmini3,1",
 418                 .matches = {
 419                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 420                         DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
 421                 },
 422         },
 423         {       /* Handle problems with rebooting on the iMac9,1. */
 424                 .callback = set_pci_reboot,
 425                 .ident = "Apple iMac9,1",
 426                 .matches = {
 427                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 428                         DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
 429                 },
 430         },
 431         {       /* Handle problems with rebooting on the Latitude E6320. */
 432                 .callback = set_pci_reboot,
 433                 .ident = "Dell Latitude E6320",
 434                 .matches = {
 435                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 436                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
 437                 },
 438         },
 439         {       /* Handle problems with rebooting on the Latitude E5420. */
 440                 .callback = set_pci_reboot,
 441                 .ident = "Dell Latitude E5420",
 442                 .matches = {
 443                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 444                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
 445                 },
 446         },
 447         {       /* Handle problems with rebooting on the Latitude E6420. */
 448                 .callback = set_pci_reboot,
 449                 .ident = "Dell Latitude E6420",
 450                 .matches = {
 451                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 452                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
 453                 },
 454         },
 455         {       /* Handle problems with rebooting on the OptiPlex 990. */
 456                 .callback = set_pci_reboot,
 457                 .ident = "Dell OptiPlex 990",
 458                 .matches = {
 459                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 460                         DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
 461                 },
 462         },
 463         { }
 464 };
 465
 466 static int __init pci_reboot_init(void)
 467 {
 468         dmi_check_system(pci_reboot_dmi_table);
 469         return 0;
 470 }
 471 core_initcall(pci_reboot_init);
 472
 473 static inline void kb_wait(void)
 474 {
 475         int i;
 476
 477         for (i = 0; i < 0x10000; i++) {
 478                 if ((inb(0x64) & 0x02) == 0)
 479                         break;
 480                 udelay(2);
 481         }
 482 }
 483
 484 static void vmxoff_nmi(int cpu, struct pt_regs *regs)
 485 {
 486         cpu_emergency_vmxoff();
 487 }
 488
 489 /* Use NMIs as IPIs to tell all CPUs to disable virtualization
 490  */
 491 static void emergency_vmx_disable_all(void)
 492 {
 493         /* Just make sure we won't change CPUs while doing this */
 494         local_irq_disable();
 495
 496         /* We need to disable VMX on all CPUs before rebooting, otherwise
 497          * we risk hanging up the machine, because the CPU ignore INIT
 498          * signals when VMX is enabled.
 499          *
 500          * We can't take any locks and we may be on an inconsistent
 501          * state, so we use NMIs as IPIs to tell the other CPUs to disable
 502          * VMX and halt.
 503          *
 504          * For safety, we will avoid running the nmi_shootdown_cpus()
 505          * stuff unnecessarily, but we don't have a way to check
 506          * if other CPUs have VMX enabled. So we will call it only if the
 507          * CPU we are running on has VMX enabled.
 508          *
 509          * We will miss cases where VMX is not enabled on all CPUs. This
 510          * shouldn't do much harm because KVM always enable VMX on all
 511          * CPUs anyway. But we can miss it on the small window where KVM
 512          * is still enabling VMX.
 513          */
 514         if (cpu_has_vmx() && cpu_vmx_enabled()) {
 515                 /* Disable VMX on this CPU.
 516                  */
 517                 cpu_vmxoff();
 518
 519                 /* Halt and disable VMX on the other CPUs */
 520                 nmi_shootdown_cpus(vmxoff_nmi);
 521
 522         }
 523 }
 524
 525
 526 void __attribute__((weak)) mach_reboot_fixups(void)
 527 {
 528 }
 529
 530 /*
 531  * Windows compatible x86 hardware expects the following on reboot:
 532  *
 533  * 1) If the FADT has the ACPI reboot register flag set, try it
 534  * 2) If still alive, write to the keyboard controller
 535  * 3) If still alive, write to the ACPI reboot register again
 536  * 4) If still alive, write to the keyboard controller again
 537  *
 538  * If the machine is still alive at this stage, it gives up. We default to
 539  * following the same pattern, except that if we're still alive after (4) we'll
 540  * try to force a triple fault and then cycle between hitting the keyboard
 541  * controller and doing that
 542  */
 543 static void native_machine_emergency_restart(void)
 544 {
 545         int i;
 546         int attempt = 0;
 547         int orig_reboot_type = reboot_type;
 548
 549         if (reboot_emergency)
 550                 emergency_vmx_disable_all();
 551
 552         tboot_shutdown(TB_SHUTDOWN_REBOOT);
 553
 554         /* Tell the BIOS if we want cold or warm reboot */
 555         *((unsigned short *)__va(0x472)) = reboot_mode;
 556
 557         for (;;) {
 558                 /* Could also try the reset bit in the Hammer NB */
 559                 switch (reboot_type) {
 560                 case BOOT_KBD:
 561                         mach_reboot_fixups(); /* for board specific fixups */
 562
 563                         for (i = 0; i < 10; i++) {
 564                                 kb_wait();
 565                                 udelay(50);
 566                                 outb(0xfe, 0x64); /* pulse reset low */
 567                                 udelay(50);
 568                         }
 569                         if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
 570                                 attempt = 1;
 571                                 reboot_type = BOOT_ACPI;
 572                         } else {
 573                                 reboot_type = BOOT_TRIPLE;
 574                         }
 575                         break;
 576
 577                 case BOOT_TRIPLE:
 578                         load_idt(&no_idt);
 579                         __asm__ __volatile__("int3");
 580
 581                         reboot_type = BOOT_KBD;
 582                         break;
 583
 584 #ifdef CONFIG_X86_32
 585                 case BOOT_BIOS:
 586                         machine_real_restart(MRR_BIOS);
 587
 588                         reboot_type = BOOT_KBD;
 589                         break;
 590 #endif
 591
 592                 case BOOT_ACPI:
 593                         acpi_reboot();
 594                         reboot_type = BOOT_KBD;
 595                         break;
 596
 597                 case BOOT_EFI:
 598                         if (efi_enabled)
 599                                 efi.reset_system(reboot_mode ?
 600                                                  EFI_RESET_WARM :
 601                                                  EFI_RESET_COLD,
 602                                                  EFI_SUCCESS, 0, NULL);
 603                         reboot_type = BOOT_KBD;
 604                         break;
 605
 606                 case BOOT_CF9:
 607                         port_cf9_safe = true;
 608                         /* fall through */
 609
 610                 case BOOT_CF9_COND:
 611                         if (port_cf9_safe) {
 612                                 u8 cf9 = inb(0xcf9) & ~6;
 613                                 outb(cf9|2, 0xcf9); /* Request hard reset */
 614                                 udelay(50);
 615                                 outb(cf9|6, 0xcf9); /* Actually do the reset */
 616                                 udelay(50);
 617                         }
 618                         reboot_type = BOOT_KBD;
 619                         break;
 620                 }
 621         }
 622 }
 623
 624 void native_machine_shutdown(void)
 625 {
 626         /* Stop the cpus and apics */
 627 #ifdef CONFIG_SMP
 628
 629         /* The boot cpu is always logical cpu 0 */
 630         int reboot_cpu_id = 0;
 631
 632 #ifdef CONFIG_X86_32
 633         /* See if there has been given a command line override */
 634         if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
 635                 cpu_online(reboot_cpu))
 636                 reboot_cpu_id = reboot_cpu;
 637 #endif
 638
 639         /* Make certain the cpu I'm about to reboot on is online */
 640         if (!cpu_online(reboot_cpu_id))
 641                 reboot_cpu_id = smp_processor_id();
 642
 643         /* Make certain I only run on the appropriate processor */
 644         set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
 645
 646         /* O.K Now that I'm on the appropriate processor,
 647          * stop all of the others.
 648          */
 649         stop_other_cpus();
 650 #endif
 651
 652         lapic_shutdown();
 653
 654 #ifdef CONFIG_X86_IO_APIC
 655         disable_IO_APIC();
 656 #endif
 657
 658 #ifdef CONFIG_HPET_TIMER
 659         hpet_disable();
 660 #endif
 661
 662 #ifdef CONFIG_X86_64
 663         x86_platform.iommu_shutdown();
 664 #endif
 665 }
 666
 667 static void __machine_emergency_restart(int emergency)
 668 {
 669         reboot_emergency = emergency;
 670         machine_ops.emergency_restart();
 671 }
 672
 673 static void native_machine_restart(char *__unused)
 674 {
 675         printk("machine restart\n");
 676
 677         if (!reboot_force)
 678                 machine_shutdown();
 679         __machine_emergency_restart(0);
 680 }
 681
 682 static void native_machine_halt(void)
 683 {
 684         /* stop other cpus and apics */
 685         machine_shutdown();
 686
 687         tboot_shutdown(TB_SHUTDOWN_HALT);
 688
 689         /* stop this cpu */
 690         stop_this_cpu(NULL);
 691 }
 692
 693 static void native_machine_power_off(void)
 694 {
 695         if (pm_power_off) {
 696                 if (!reboot_force)
 697                         machine_shutdown();
 698                 pm_power_off();
 699         }
 700         /* a fallback in case there is no PM info available */
 701         tboot_shutdown(TB_SHUTDOWN_HALT);
 702 }
 703
 704 struct machine_ops machine_ops = {
 705         .power_off = native_machine_power_off,
 706         .shutdown = native_machine_shutdown,
 707         .emergency_restart = native_machine_emergency_restart,
 708         .restart = native_machine_restart,
 709         .halt = native_machine_halt,
 710 #ifdef CONFIG_KEXEC
 711         .crash_shutdown = native_machine_crash_shutdown,
 712 #endif
 713 };
 714
 715 void machine_power_off(void)
 716 {
 717         machine_ops.power_off();
 718 }
 719
 720 void machine_shutdown(void)
 721 {
 722         machine_ops.shutdown();
 723 }
 724
 725 void machine_emergency_restart(void)
 726 {
 727         __machine_emergency_restart(1);
 728 }
 729
 730 void machine_restart(char *cmd)
 731 {
 732         machine_ops.restart(cmd);
 733 }
 734
 735 void machine_halt(void)
 736 {
 737         machine_ops.halt();
 738 }
 739
 740 #ifdef CONFIG_KEXEC
 741 void machine_crash_shutdown(struct pt_regs *regs)
 742 {
 743         machine_ops.crash_shutdown(regs);
 744 }
 745 #endif
 746
 747
 748 #if defined(CONFIG_SMP)
 749
 750 /* This keeps a track of which one is crashing cpu. */
 751 static int crashing_cpu;
 752 static nmi_shootdown_cb shootdown_callback;
 753
 754 static atomic_t waiting_for_crash_ipi;
 755
 756 static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
 757 {
 758         int cpu;
 759
 760         cpu = raw_smp_processor_id();
 761
 762         /* Don't do anything if this handler is invoked on crashing cpu.
 763          * Otherwise, system will completely hang. Crashing cpu can get
 764          * an NMI if system was initially booted with nmi_watchdog parameter.
 765          */
 766         if (cpu == crashing_cpu)
 767                 return NMI_HANDLED;
 768         local_irq_disable();
 769
 770         shootdown_callback(cpu, regs);
 771
 772         atomic_dec(&waiting_for_crash_ipi);
 773         /* Assume hlt works */
 774         halt();
 775         for (;;)
 776                 cpu_relax();
 777
 778         return NMI_HANDLED;
 779 }
 780
 781 static void smp_send_nmi_allbutself(void)
 782 {
 783         apic->send_IPI_allbutself(NMI_VECTOR);
 784 }
 785
 786 /* Halt all other CPUs, calling the specified function on each of them
 787  *
 788  * This function can be used to halt all other CPUs on crash
 789  * or emergency reboot time. The function passed as parameter
 790  * will be called inside a NMI handler on all CPUs.
 791  */
 792 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 793 {
 794         unsigned long msecs;
 795         local_irq_disable();
 796
 797         /* Make a note of crashing cpu. Will be used in NMI callback.*/
 798         crashing_cpu = safe_smp_processor_id();
 799
 800         shootdown_callback = callback;
 801
 802         atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
 803         /* Would it be better to replace the trap vector here? */
 804         if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
 805                                  NMI_FLAG_FIRST, "crash"))
 806                 return;         /* return what? */
 807         /* Ensure the new callback function is set before sending
 808          * out the NMI
 809          */
 810         wmb();
 811
 812         smp_send_nmi_allbutself();
 813
 814         msecs = 1000; /* Wait at most a second for the other cpus to stop */
 815         while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
 816                 mdelay(1);
 817                 msecs--;
 818         }
 819
 820         /* Leave the nmi callback set */
 821 }
 822 #else /* !CONFIG_SMP */
 823 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 824 {
 825         /* No other CPUs to shoot down */
 826 }
 827 #endif