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         { }
 456 };
 457
 458 static int __init pci_reboot_init(void)
 459 {
 460         dmi_check_system(pci_reboot_dmi_table);
 461         return 0;
 462 }
 463 core_initcall(pci_reboot_init);
 464
 465 static inline void kb_wait(void)
 466 {
 467         int i;
 468
 469         for (i = 0; i < 0x10000; i++) {
 470                 if ((inb(0x64) & 0x02) == 0)
 471                         break;
 472                 udelay(2);
 473         }
 474 }
 475
 476 static void vmxoff_nmi(int cpu, struct die_args *args)
 477 {
 478         cpu_emergency_vmxoff();
 479 }
 480
 481 /* Use NMIs as IPIs to tell all CPUs to disable virtualization
 482  */
 483 static void emergency_vmx_disable_all(void)
 484 {
 485         /* Just make sure we won't change CPUs while doing this */
 486         local_irq_disable();
 487
 488         /* We need to disable VMX on all CPUs before rebooting, otherwise
 489          * we risk hanging up the machine, because the CPU ignore INIT
 490          * signals when VMX is enabled.
 491          *
 492          * We can't take any locks and we may be on an inconsistent
 493          * state, so we use NMIs as IPIs to tell the other CPUs to disable
 494          * VMX and halt.
 495          *
 496          * For safety, we will avoid running the nmi_shootdown_cpus()
 497          * stuff unnecessarily, but we don't have a way to check
 498          * if other CPUs have VMX enabled. So we will call it only if the
 499          * CPU we are running on has VMX enabled.
 500          *
 501          * We will miss cases where VMX is not enabled on all CPUs. This
 502          * shouldn't do much harm because KVM always enable VMX on all
 503          * CPUs anyway. But we can miss it on the small window where KVM
 504          * is still enabling VMX.
 505          */
 506         if (cpu_has_vmx() && cpu_vmx_enabled()) {
 507                 /* Disable VMX on this CPU.
 508                  */
 509                 cpu_vmxoff();
 510
 511                 /* Halt and disable VMX on the other CPUs */
 512                 nmi_shootdown_cpus(vmxoff_nmi);
 513
 514         }
 515 }
 516
 517
 518 void __attribute__((weak)) mach_reboot_fixups(void)
 519 {
 520 }
 521
 522 /*
 523  * Windows compatible x86 hardware expects the following on reboot:
 524  *
 525  * 1) If the FADT has the ACPI reboot register flag set, try it
 526  * 2) If still alive, write to the keyboard controller
 527  * 3) If still alive, write to the ACPI reboot register again
 528  * 4) If still alive, write to the keyboard controller again
 529  *
 530  * If the machine is still alive at this stage, it gives up. We default to
 531  * following the same pattern, except that if we're still alive after (4) we'll
 532  * try to force a triple fault and then cycle between hitting the keyboard
 533  * controller and doing that
 534  */
 535 static void native_machine_emergency_restart(void)
 536 {
 537         int i;
 538         int attempt = 0;
 539         int orig_reboot_type = reboot_type;
 540
 541         if (reboot_emergency)
 542                 emergency_vmx_disable_all();
 543
 544         tboot_shutdown(TB_SHUTDOWN_REBOOT);
 545
 546         /* Tell the BIOS if we want cold or warm reboot */
 547         *((unsigned short *)__va(0x472)) = reboot_mode;
 548
 549         for (;;) {
 550                 /* Could also try the reset bit in the Hammer NB */
 551                 switch (reboot_type) {
 552                 case BOOT_KBD:
 553                         mach_reboot_fixups(); /* for board specific fixups */
 554
 555                         for (i = 0; i < 10; i++) {
 556                                 kb_wait();
 557                                 udelay(50);
 558                                 outb(0xfe, 0x64); /* pulse reset low */
 559                                 udelay(50);
 560                         }
 561                         if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
 562                                 attempt = 1;
 563                                 reboot_type = BOOT_ACPI;
 564                         } else {
 565                                 reboot_type = BOOT_TRIPLE;
 566                         }
 567                         break;
 568
 569                 case BOOT_TRIPLE:
 570                         load_idt(&no_idt);
 571                         __asm__ __volatile__("int3");
 572
 573                         reboot_type = BOOT_KBD;
 574                         break;
 575
 576 #ifdef CONFIG_X86_32
 577                 case BOOT_BIOS:
 578                         machine_real_restart(MRR_BIOS);
 579
 580                         reboot_type = BOOT_KBD;
 581                         break;
 582 #endif
 583
 584                 case BOOT_ACPI:
 585                         acpi_reboot();
 586                         reboot_type = BOOT_KBD;
 587                         break;
 588
 589                 case BOOT_EFI:
 590                         if (efi_enabled)
 591                                 efi.reset_system(reboot_mode ?
 592                                                  EFI_RESET_WARM :
 593                                                  EFI_RESET_COLD,
 594                                                  EFI_SUCCESS, 0, NULL);
 595                         reboot_type = BOOT_KBD;
 596                         break;
 597
 598                 case BOOT_CF9:
 599                         port_cf9_safe = true;
 600                         /* fall through */
 601
 602                 case BOOT_CF9_COND:
 603                         if (port_cf9_safe) {
 604                                 u8 cf9 = inb(0xcf9) & ~6;
 605                                 outb(cf9|2, 0xcf9); /* Request hard reset */
 606                                 udelay(50);
 607                                 outb(cf9|6, 0xcf9); /* Actually do the reset */
 608                                 udelay(50);
 609                         }
 610                         reboot_type = BOOT_KBD;
 611                         break;
 612                 }
 613         }
 614 }
 615
 616 void native_machine_shutdown(void)
 617 {
 618         /* Stop the cpus and apics */
 619 #ifdef CONFIG_SMP
 620
 621         /* The boot cpu is always logical cpu 0 */
 622         int reboot_cpu_id = 0;
 623
 624 #ifdef CONFIG_X86_32
 625         /* See if there has been given a command line override */
 626         if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
 627                 cpu_online(reboot_cpu))
 628                 reboot_cpu_id = reboot_cpu;
 629 #endif
 630
 631         /* Make certain the cpu I'm about to reboot on is online */
 632         if (!cpu_online(reboot_cpu_id))
 633                 reboot_cpu_id = smp_processor_id();
 634
 635         /* Make certain I only run on the appropriate processor */
 636         set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
 637
 638         /* O.K Now that I'm on the appropriate processor,
 639          * stop all of the others.
 640          */
 641         stop_other_cpus();
 642 #endif
 643
 644         lapic_shutdown();
 645
 646 #ifdef CONFIG_X86_IO_APIC
 647         disable_IO_APIC();
 648 #endif
 649
 650 #ifdef CONFIG_HPET_TIMER
 651         hpet_disable();
 652 #endif
 653
 654 #ifdef CONFIG_X86_64
 655         x86_platform.iommu_shutdown();
 656 #endif
 657 }
 658
 659 static void __machine_emergency_restart(int emergency)
 660 {
 661         reboot_emergency = emergency;
 662         machine_ops.emergency_restart();
 663 }
 664
 665 static void native_machine_restart(char *__unused)
 666 {
 667         printk("machine restart\n");
 668
 669         if (!reboot_force)
 670                 machine_shutdown();
 671         __machine_emergency_restart(0);
 672 }
 673
 674 static void native_machine_halt(void)
 675 {
 676         /* stop other cpus and apics */
 677         machine_shutdown();
 678
 679         tboot_shutdown(TB_SHUTDOWN_HALT);
 680
 681         /* stop this cpu */
 682         stop_this_cpu(NULL);
 683 }
 684
 685 static void native_machine_power_off(void)
 686 {
 687         if (pm_power_off) {
 688                 if (!reboot_force)
 689                         machine_shutdown();
 690                 pm_power_off();
 691         }
 692         /* a fallback in case there is no PM info available */
 693         tboot_shutdown(TB_SHUTDOWN_HALT);
 694 }
 695
 696 struct machine_ops machine_ops = {
 697         .power_off = native_machine_power_off,
 698         .shutdown = native_machine_shutdown,
 699         .emergency_restart = native_machine_emergency_restart,
 700         .restart = native_machine_restart,
 701         .halt = native_machine_halt,
 702 #ifdef CONFIG_KEXEC
 703         .crash_shutdown = native_machine_crash_shutdown,
 704 #endif
 705 };
 706
 707 void machine_power_off(void)
 708 {
 709         machine_ops.power_off();
 710 }
 711
 712 void machine_shutdown(void)
 713 {
 714         machine_ops.shutdown();
 715 }
 716
 717 void machine_emergency_restart(void)
 718 {
 719         __machine_emergency_restart(1);
 720 }
 721
 722 void machine_restart(char *cmd)
 723 {
 724         machine_ops.restart(cmd);
 725 }
 726
 727 void machine_halt(void)
 728 {
 729         machine_ops.halt();
 730 }
 731
 732 #ifdef CONFIG_KEXEC
 733 void machine_crash_shutdown(struct pt_regs *regs)
 734 {
 735         machine_ops.crash_shutdown(regs);
 736 }
 737 #endif
 738
 739
 740 #if defined(CONFIG_SMP)
 741
 742 /* This keeps a track of which one is crashing cpu. */
 743 static int crashing_cpu;
 744 static nmi_shootdown_cb shootdown_callback;
 745
 746 static atomic_t waiting_for_crash_ipi;
 747
 748 static int crash_nmi_callback(struct notifier_block *self,
 749                         unsigned long val, void *data)
 750 {
 751         int cpu;
 752
 753         if (val != DIE_NMI)
 754                 return NOTIFY_OK;
 755
 756         cpu = raw_smp_processor_id();
 757
 758         /* Don't do anything if this handler is invoked on crashing cpu.
 759          * Otherwise, system will completely hang. Crashing cpu can get
 760          * an NMI if system was initially booted with nmi_watchdog parameter.
 761          */
 762         if (cpu == crashing_cpu)
 763                 return NOTIFY_STOP;
 764         local_irq_disable();
 765
 766         shootdown_callback(cpu, (struct die_args *)data);
 767
 768         atomic_dec(&waiting_for_crash_ipi);
 769         /* Assume hlt works */
 770         halt();
 771         for (;;)
 772                 cpu_relax();
 773
 774         return 1;
 775 }
 776
 777 static void smp_send_nmi_allbutself(void)
 778 {
 779         apic->send_IPI_allbutself(NMI_VECTOR);
 780 }
 781
 782 static struct notifier_block crash_nmi_nb = {
 783         .notifier_call = crash_nmi_callback,
 784         /* we want to be the first one called */
 785         .priority = NMI_LOCAL_HIGH_PRIOR+1,
 786 };
 787
 788 /* Halt all other CPUs, calling the specified function on each of them
 789  *
 790  * This function can be used to halt all other CPUs on crash
 791  * or emergency reboot time. The function passed as parameter
 792  * will be called inside a NMI handler on all CPUs.
 793  */
 794 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 795 {
 796         unsigned long msecs;
 797         local_irq_disable();
 798
 799         /* Make a note of crashing cpu. Will be used in NMI callback.*/
 800         crashing_cpu = safe_smp_processor_id();
 801
 802         shootdown_callback = callback;
 803
 804         atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
 805         /* Would it be better to replace the trap vector here? */
 806         if (register_die_notifier(&crash_nmi_nb))
 807                 return;         /* return what? */
 808         /* Ensure the new callback function is set before sending
 809          * out the NMI
 810          */
 811         wmb();
 812
 813         smp_send_nmi_allbutself();
 814
 815         msecs = 1000; /* Wait at most a second for the other cpus to stop */
 816         while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
 817                 mdelay(1);
 818                 msecs--;
 819         }
 820
 821         /* Leave the nmi callback set */
 822 }
 823 #else /* !CONFIG_SMP */
 824 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 825 {
 826         /* No other CPUs to shoot down */
 827 }
 828 #endif