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 <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>
  21
  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
  28
  29 /*
  30  * Power off function, if any
  31  */
  32 void (*pm_power_off)(void);
  33 EXPORT_SYMBOL(pm_power_off);
  34
  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;
  39
  40 #if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
  41 static int reboot_cpu = -1;
  42 #endif
  43
  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
  47  */
  48 static int reboot_emergency;
  49
  50 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */
  51 bool port_cf9_safe = false;
  52
  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.
  64  */
  65 static int __init reboot_setup(char *str)
  66 {
  67         for (;;) {
  68                 switch (*str) {
  69                 case 'w':
  70                         reboot_mode = 0x1234;
  71                         break;
  72
  73                 case 'c':
  74                         reboot_mode = 0;
  75                         break;
  76
  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');
  84                         }
  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 */
  90
  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;
 100
 101                 case 'f':
 102                         reboot_force = 1;
 103                         break;
 104                 }
 105
 106                 str = strchr(str, ',');
 107                 if (str)
 108                         str++;
 109                 else
 110                         break;
 111         }
 112         return 1;
 113 }
 114
 115 __setup("reboot=", reboot_setup);
 116
 117
 118 #ifdef CONFIG_X86_32
 119 /*
 120  * Reboot options and system auto-detection code provided by
 121  * Dell Inc. so their systems "just work". :-)
 122  */
 123
 124 /*
 125  * Some machines require the "reboot=b"  commandline option,
 126  * this quirk makes that automatic.
 127  */
 128 static int __init set_bios_reboot(const struct dmi_system_id *d)
 129 {
 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);
 133         }
 134         return 0;
 135 }
 136
 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"),
 144                 },
 145         },
 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/"),
 152                 },
 153         },
 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/"),
 160                 },
 161         },
 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"),
 168                 },
 169         },
 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"),
 177                 },
 178         },
 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"),
 186                 },
 187         },
 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"),
 195                 },
 196         },
 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"),
 204                 },
 205         },
 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"),
 213                 },
 214         },
 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"),
 221                 },
 222         },
 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"),
 229                 },
 230         },
 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"),
 237                 },
 238         },
 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"),
 245                 },
 246         },
 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"),
 253                 },
 254         },
 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"),
 261                 },
 262         },
 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"),
 269                 },
 270         },
 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"),
 277                 },
 278         },
 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"),
 285                 },
 286         },
 287         { }
 288 };
 289
 290 static int __init reboot_init(void)
 291 {
 292         dmi_check_system(reboot_dmi_table);
 293         return 0;
 294 }
 295 core_initcall(reboot_init);
 296
 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] =
 305 {
 306         0x0000000000000000ULL,  /* Null descriptor */
 307         0x00009b000000ffffULL,  /* 16-bit real-mode 64k code at 0x00000000 */
 308         0x000093000100ffffULL   /* 16-bit real-mode 64k data at 0x00000100 */
 309 };
 310
 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 };
 314
 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.
 317
 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.
 323
 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.
 330
 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 [] =
 334 {
 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        */
 346 };
 347 static const unsigned char jump_to_bios [] =
 348 {
 349         0xea, 0x00, 0x00, 0xff, 0xff            /*    ljmp  $0xffff,$0x0000  */
 350 };
 351
 352 /*
 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!
 356  */
 357 void machine_real_restart(const unsigned char *code, int length)
 358 {
 359         local_irq_disable();
 360
 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.)
 369          */
 370         spin_lock(&rtc_lock);
 371         CMOS_WRITE(0x00, 0x8f);
 372         spin_unlock(&rtc_lock);
 373
 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);
 379
 380         /*
 381          * Use `swapper_pg_dir' as our page directory.
 382          */
 383         load_cr3(swapper_pg_dir);
 384
 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;
 391
 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);
 400
 401         /* Set up the IDT for real mode. */
 402         load_idt(&real_mode_idt);
 403
 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);
 408
 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");
 420
 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"
 425                                 :
 426                                 : "i" ((void *)(0x1000 - sizeof (real_mode_switch) - 100)));
 427 }
 428 #ifdef CONFIG_APM_MODULE
 429 EXPORT_SYMBOL(machine_real_restart);
 430 #endif
 431
 432 #endif /* CONFIG_X86_32 */
 433
 434 /*
 435  * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
 436  */
 437 static int __init set_pci_reboot(const struct dmi_system_id *d)
 438 {
 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);
 443         }
 444         return 0;
 445 }
 446
 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"),
 454                 },
 455         },
 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"),
 462                 },
 463         },
 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"),
 470                 },
 471         },
 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"),
 478                 },
 479         },
 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"),
 486                 },
 487         },
 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"),
 494                 },
 495         },
 496         { }
 497 };
 498
 499 static int __init pci_reboot_init(void)
 500 {
 501         dmi_check_system(pci_reboot_dmi_table);
 502         return 0;
 503 }
 504 core_initcall(pci_reboot_init);
 505
 506 static inline void kb_wait(void)
 507 {
 508         int i;
 509
 510         for (i = 0; i < 0x10000; i++) {
 511                 if ((inb(0x64) & 0x02) == 0)
 512                         break;
 513                 udelay(2);
 514         }
 515 }
 516
 517 static void vmxoff_nmi(int cpu, struct die_args *args)
 518 {
 519         cpu_emergency_vmxoff();
 520 }
 521
 522 /* Use NMIs as IPIs to tell all CPUs to disable virtualization
 523  */
 524 static void emergency_vmx_disable_all(void)
 525 {
 526         /* Just make sure we won't change CPUs while doing this */
 527         local_irq_disable();
 528
 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.
 532          *
 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.
 536          *
 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.
 541          *
 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.
 546          */
 547         if (cpu_has_vmx() && cpu_vmx_enabled()) {
 548                 /* Disable VMX on this CPU.
 549                  */
 550                 cpu_vmxoff();
 551
 552                 /* Halt and disable VMX on the other CPUs */
 553                 nmi_shootdown_cpus(vmxoff_nmi);
 554
 555         }
 556 }
 557
 558
 559 void __attribute__((weak)) mach_reboot_fixups(void)
 560 {
 561 }
 562
 563 static void native_machine_emergency_restart(void)
 564 {
 565         int i;
 566
 567         if (reboot_emergency)
 568                 emergency_vmx_disable_all();
 569
 570         tboot_shutdown(TB_SHUTDOWN_REBOOT);
 571
 572         /* Tell the BIOS if we want cold or warm reboot */
 573         *((unsigned short *)__va(0x472)) = reboot_mode;
 574
 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 */
 580
 581                         for (i = 0; i < 10; i++) {
 582                                 kb_wait();
 583                                 udelay(50);
 584                                 outb(0xfe, 0x64); /* pulse reset low */
 585                                 udelay(50);
 586                         }
 587
 588                 case BOOT_TRIPLE:
 589                         load_idt(&no_idt);
 590                         __asm__ __volatile__("int3");
 591
 592                         reboot_type = BOOT_KBD;
 593                         break;
 594
 595 #ifdef CONFIG_X86_32
 596                 case BOOT_BIOS:
 597                         machine_real_restart(jump_to_bios, sizeof(jump_to_bios));
 598
 599                         reboot_type = BOOT_KBD;
 600                         break;
 601 #endif
 602
 603                 case BOOT_ACPI:
 604                         acpi_reboot();
 605                         reboot_type = BOOT_KBD;
 606                         break;
 607
 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;
 616
 617                 case BOOT_CF9:
 618                         port_cf9_safe = true;
 619                         /* fall through */
 620
 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);
 628                         }
 629                         reboot_type = BOOT_KBD;
 630                         break;
 631                 }
 632         }
 633 }
 634
 635 void native_machine_shutdown(void)
 636 {
 637         /* Stop the cpus and apics */
 638 #ifdef CONFIG_SMP
 639
 640         /* The boot cpu is always logical cpu 0 */
 641         int reboot_cpu_id = 0;
 642
 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
 649
 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();
 653
 654         /* Make certain I only run on the appropriate processor */
 655         set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id));
 656
 657         /* O.K Now that I'm on the appropriate processor,
 658          * stop all of the others.
 659          */
 660         stop_other_cpus();
 661 #endif
 662
 663         lapic_shutdown();
 664
 665 #ifdef CONFIG_X86_IO_APIC
 666         disable_IO_APIC();
 667 #endif
 668
 669 #ifdef CONFIG_HPET_TIMER
 670         hpet_disable();
 671 #endif
 672
 673 #ifdef CONFIG_X86_64
 674         x86_platform.iommu_shutdown();
 675 #endif
 676 }
 677
 678 static void __machine_emergency_restart(int emergency)
 679 {
 680         reboot_emergency = emergency;
 681         machine_ops.emergency_restart();
 682 }
 683
 684 static void native_machine_restart(char *__unused)
 685 {
 686         printk("machine restart\n");
 687
 688         if (!reboot_force)
 689                 machine_shutdown();
 690         __machine_emergency_restart(0);
 691 }
 692
 693 static void native_machine_halt(void)
 694 {
 695         /* stop other cpus and apics */
 696         machine_shutdown();
 697
 698         tboot_shutdown(TB_SHUTDOWN_HALT);
 699
 700         /* stop this cpu */
 701         stop_this_cpu(NULL);
 702 }
 703
 704 static void native_machine_power_off(void)
 705 {
 706         if (pm_power_off) {
 707                 if (!reboot_force)
 708                         machine_shutdown();
 709                 pm_power_off();
 710         }
 711         /* a fallback in case there is no PM info available */
 712         tboot_shutdown(TB_SHUTDOWN_HALT);
 713 }
 714
 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
 724 };
 725
 726 void machine_power_off(void)
 727 {
 728         machine_ops.power_off();
 729 }
 730
 731 void machine_shutdown(void)
 732 {
 733         machine_ops.shutdown();
 734 }
 735
 736 void machine_emergency_restart(void)
 737 {
 738         __machine_emergency_restart(1);
 739 }
 740
 741 void machine_restart(char *cmd)
 742 {
 743         machine_ops.restart(cmd);
 744 }
 745
 746 void machine_halt(void)
 747 {
 748         machine_ops.halt();
 749 }
 750
 751 #ifdef CONFIG_KEXEC
 752 void machine_crash_shutdown(struct pt_regs *regs)
 753 {
 754         machine_ops.crash_shutdown(regs);
 755 }
 756 #endif
 757
 758
 759 #if defined(CONFIG_SMP)
 760
 761 /* This keeps a track of which one is crashing cpu. */
 762 static int crashing_cpu;
 763 static nmi_shootdown_cb shootdown_callback;
 764
 765 static atomic_t waiting_for_crash_ipi;
 766
 767 static int crash_nmi_callback(struct notifier_block *self,
 768                         unsigned long val, void *data)
 769 {
 770         int cpu;
 771
 772         if (val != DIE_NMI_IPI)
 773                 return NOTIFY_OK;
 774
 775         cpu = raw_smp_processor_id();
 776
 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.
 780          */
 781         if (cpu == crashing_cpu)
 782                 return NOTIFY_STOP;
 783         local_irq_disable();
 784
 785         shootdown_callback(cpu, (struct die_args *)data);
 786
 787         atomic_dec(&waiting_for_crash_ipi);
 788         /* Assume hlt works */
 789         halt();
 790         for (;;)
 791                 cpu_relax();
 792
 793         return 1;
 794 }
 795
 796 static void smp_send_nmi_allbutself(void)
 797 {
 798         apic->send_IPI_allbutself(NMI_VECTOR);
 799 }
 800
 801 static struct notifier_block crash_nmi_nb = {
 802         .notifier_call = crash_nmi_callback,
 803 };
 804
 805 /* Halt all other CPUs, calling the specified function on each of them
 806  *
 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.
 810  */
 811 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 812 {
 813         unsigned long msecs;
 814         local_irq_disable();
 815
 816         /* Make a note of crashing cpu. Will be used in NMI callback.*/
 817         crashing_cpu = safe_smp_processor_id();
 818
 819         shootdown_callback = callback;
 820
 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
 827          */
 828         wmb();
 829
 830         smp_send_nmi_allbutself();
 831
 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--;
 836         }
 837
 838         /* Leave the nmi callback set */
 839 }
 840 #else /* !CONFIG_SMP */
 841 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 842 {
 843         /* No other CPUs to shoot down */
 844 }
 845 #endif