drivers/acpi/bus.c

   1 /*
   2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/device.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/acpi.h>
  35 #include <linux/slab.h>
  36 #ifdef CONFIG_X86
  37 #include <asm/mpspec.h>
  38 #endif
  39 #include <linux/pci.h>
  40 #include <acpi/acpi_bus.h>
  41 #include <acpi/acpi_drivers.h>
  42 #include <acpi/apei.h>
  43 #include <linux/dmi.h>
  44 #include <linux/suspend.h>
  45
  46 #include "internal.h"
  47
  48 #define _COMPONENT              ACPI_BUS_COMPONENT
  49 ACPI_MODULE_NAME("bus");
  50
  51 struct acpi_device *acpi_root;
  52 struct proc_dir_entry *acpi_root_dir;
  53 EXPORT_SYMBOL(acpi_root_dir);
  54
  55 #define STRUCT_TO_INT(s)        (*((int*)&s))
  56
  57
  58 #ifdef CONFIG_X86
  59 static int set_copy_dsdt(const struct dmi_system_id *id)
  60 {
  61         printk(KERN_NOTICE "%s detected - "
  62                 "force copy of DSDT to local memory\n", id->ident);
  63         acpi_gbl_copy_dsdt_locally = 1;
  64         return 0;
  65 }
  66
  67 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  68         /*
  69          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  70          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  71          */
  72         {
  73          .callback = set_copy_dsdt,
  74          .ident = "TOSHIBA Satellite",
  75          .matches = {
  76                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  77                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  78                 },
  79         },
  80         {}
  81 };
  82 #else
  83 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  84         {}
  85 };
  86 #endif
  87
  88 /* --------------------------------------------------------------------------
  89                                 Device Management
  90    -------------------------------------------------------------------------- */
  91
  92 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  93                                        unsigned long long *sta)
  94 {
  95         acpi_status status;
  96
  97         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  98         if (ACPI_SUCCESS(status))
  99                 return AE_OK;
 100
 101         if (status == AE_NOT_FOUND) {
 102                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 103                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 104                 return AE_OK;
 105         }
 106         return status;
 107 }
 108
 109 int acpi_bus_get_status(struct acpi_device *device)
 110 {
 111         acpi_status status;
 112         unsigned long long sta;
 113
 114         status = acpi_bus_get_status_handle(device->handle, &sta);
 115         if (ACPI_FAILURE(status))
 116                 return -ENODEV;
 117
 118         STRUCT_TO_INT(device->status) = (int) sta;
 119
 120         if (device->status.functional && !device->status.present) {
 121                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 122                        "functional but not present;\n",
 123                         device->pnp.bus_id,
 124                         (u32) STRUCT_TO_INT(device->status)));
 125         }
 126
 127         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 128                           device->pnp.bus_id,
 129                           (u32) STRUCT_TO_INT(device->status)));
 130         return 0;
 131 }
 132 EXPORT_SYMBOL(acpi_bus_get_status);
 133
 134 void acpi_bus_private_data_handler(acpi_handle handle,
 135                                    void *context)
 136 {
 137         return;
 138 }
 139 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 140
 141 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 142 {
 143         acpi_status status;
 144
 145         if (!*data)
 146                 return -EINVAL;
 147
 148         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 149         if (ACPI_FAILURE(status) || !*data) {
 150                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 151                                 handle));
 152                 return -ENODEV;
 153         }
 154
 155         return 0;
 156 }
 157 EXPORT_SYMBOL(acpi_bus_get_private_data);
 158
 159 static void acpi_print_osc_error(acpi_handle handle,
 160         struct acpi_osc_context *context, char *error)
 161 {
 162         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 163         int i;
 164
 165         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 166                 printk(KERN_DEBUG "%s\n", error);
 167         else {
 168                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 169                 kfree(buffer.pointer);
 170         }
 171         printk(KERN_DEBUG"_OSC request data:");
 172         for (i = 0; i < context->cap.length; i += sizeof(u32))
 173                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 174         printk("\n");
 175 }
 176
 177 acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 178 {
 179         int i;
 180         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 181                 24, 26, 28, 30, 32, 34};
 182
 183         if (strlen(str) != 36)
 184                 return AE_BAD_PARAMETER;
 185         for (i = 0; i < 36; i++) {
 186                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 187                         if (str[i] != '-')
 188                                 return AE_BAD_PARAMETER;
 189                 } else if (!isxdigit(str[i]))
 190                         return AE_BAD_PARAMETER;
 191         }
 192         for (i = 0; i < 16; i++) {
 193                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 194                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 195         }
 196         return AE_OK;
 197 }
 198 EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
 199
 200 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 201 {
 202         acpi_status status;
 203         struct acpi_object_list input;
 204         union acpi_object in_params[4];
 205         union acpi_object *out_obj;
 206         u8 uuid[16];
 207         u32 errors;
 208         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 209
 210         if (!context)
 211                 return AE_ERROR;
 212         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 213                 return AE_ERROR;
 214         context->ret.length = ACPI_ALLOCATE_BUFFER;
 215         context->ret.pointer = NULL;
 216
 217         /* Setting up input parameters */
 218         input.count = 4;
 219         input.pointer = in_params;
 220         in_params[0].type               = ACPI_TYPE_BUFFER;
 221         in_params[0].buffer.length      = 16;
 222         in_params[0].buffer.pointer     = uuid;
 223         in_params[1].type               = ACPI_TYPE_INTEGER;
 224         in_params[1].integer.value      = context->rev;
 225         in_params[2].type               = ACPI_TYPE_INTEGER;
 226         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 227         in_params[3].type               = ACPI_TYPE_BUFFER;
 228         in_params[3].buffer.length      = context->cap.length;
 229         in_params[3].buffer.pointer     = context->cap.pointer;
 230
 231         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 232         if (ACPI_FAILURE(status))
 233                 return status;
 234
 235         if (!output.length)
 236                 return AE_NULL_OBJECT;
 237
 238         out_obj = output.pointer;
 239         if (out_obj->type != ACPI_TYPE_BUFFER
 240                 || out_obj->buffer.length != context->cap.length) {
 241                 acpi_print_osc_error(handle, context,
 242                         "_OSC evaluation returned wrong type");
 243                 status = AE_TYPE;
 244                 goto out_kfree;
 245         }
 246         /* Need to ignore the bit0 in result code */
 247         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 248         if (errors) {
 249                 if (errors & OSC_REQUEST_ERROR)
 250                         acpi_print_osc_error(handle, context,
 251                                 "_OSC request failed");
 252                 if (errors & OSC_INVALID_UUID_ERROR)
 253                         acpi_print_osc_error(handle, context,
 254                                 "_OSC invalid UUID");
 255                 if (errors & OSC_INVALID_REVISION_ERROR)
 256                         acpi_print_osc_error(handle, context,
 257                                 "_OSC invalid revision");
 258                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 259                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 260                             & OSC_QUERY_ENABLE)
 261                                 goto out_success;
 262                         status = AE_SUPPORT;
 263                         goto out_kfree;
 264                 }
 265                 status = AE_ERROR;
 266                 goto out_kfree;
 267         }
 268 out_success:
 269         context->ret.length = out_obj->buffer.length;
 270         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 271                                        context->ret.length, GFP_KERNEL);
 272         if (!context->ret.pointer) {
 273                 status =  AE_NO_MEMORY;
 274                 goto out_kfree;
 275         }
 276         status =  AE_OK;
 277
 278 out_kfree:
 279         kfree(output.pointer);
 280         if (status != AE_OK)
 281                 context->ret.pointer = NULL;
 282         return status;
 283 }
 284 EXPORT_SYMBOL(acpi_run_osc);
 285
 286 bool osc_sb_apei_support_acked;
 287 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 288 static void acpi_bus_osc_support(void)
 289 {
 290         u32 capbuf[2];
 291         struct acpi_osc_context context = {
 292                 .uuid_str = sb_uuid_str,
 293                 .rev = 1,
 294                 .cap.length = 8,
 295                 .cap.pointer = capbuf,
 296         };
 297         acpi_handle handle;
 298
 299         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 300         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 301 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 302                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 303         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 304 #endif
 305
 306 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 307         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 308 #endif
 309
 310 #ifdef ACPI_HOTPLUG_OST
 311         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 312 #endif
 313
 314         if (!ghes_disable)
 315                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 316         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 317                 return;
 318         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 319                 u32 *capbuf_ret = context.ret.pointer;
 320                 if (context.ret.length > OSC_SUPPORT_DWORD)
 321                         osc_sb_apei_support_acked =
 322                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 323                 kfree(context.ret.pointer);
 324         }
 325         /* do we need to check other returned cap? Sounds no */
 326 }
 327
 328 /* --------------------------------------------------------------------------
 329                              Notification Handling
 330    -------------------------------------------------------------------------- */
 331
 332 static void acpi_bus_check_device(acpi_handle handle)
 333 {
 334         struct acpi_device *device;
 335         acpi_status status;
 336         struct acpi_device_status old_status;
 337
 338         if (acpi_bus_get_device(handle, &device))
 339                 return;
 340         if (!device)
 341                 return;
 342
 343         old_status = device->status;
 344
 345         /*
 346          * Make sure this device's parent is present before we go about
 347          * messing with the device.
 348          */
 349         if (device->parent && !device->parent->status.present) {
 350                 device->status = device->parent->status;
 351                 return;
 352         }
 353
 354         status = acpi_bus_get_status(device);
 355         if (ACPI_FAILURE(status))
 356                 return;
 357
 358         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 359                 return;
 360
 361         /*
 362          * Device Insertion/Removal
 363          */
 364         if ((device->status.present) && !(old_status.present)) {
 365                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 366                 /* TBD: Handle device insertion */
 367         } else if (!(device->status.present) && (old_status.present)) {
 368                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 369                 /* TBD: Handle device removal */
 370         }
 371 }
 372
 373 static void acpi_bus_check_scope(acpi_handle handle)
 374 {
 375         /* Status Change? */
 376         acpi_bus_check_device(handle);
 377
 378         /*
 379          * TBD: Enumerate child devices within this device's scope and
 380          *       run acpi_bus_check_device()'s on them.
 381          */
 382 }
 383
 384 /**
 385  * acpi_bus_notify
 386  * ---------------
 387  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 388  */
 389 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 390 {
 391         struct acpi_device *device = NULL;
 392         struct acpi_driver *driver;
 393
 394         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 395                           type, handle));
 396
 397         switch (type) {
 398
 399         case ACPI_NOTIFY_BUS_CHECK:
 400                 acpi_bus_check_scope(handle);
 401                 /*
 402                  * TBD: We'll need to outsource certain events to non-ACPI
 403                  *      drivers via the device manager (device.c).
 404                  */
 405                 break;
 406
 407         case ACPI_NOTIFY_DEVICE_CHECK:
 408                 acpi_bus_check_device(handle);
 409                 /*
 410                  * TBD: We'll need to outsource certain events to non-ACPI
 411                  *      drivers via the device manager (device.c).
 412                  */
 413                 break;
 414
 415         case ACPI_NOTIFY_DEVICE_WAKE:
 416                 /* TBD */
 417                 break;
 418
 419         case ACPI_NOTIFY_EJECT_REQUEST:
 420                 /* TBD */
 421                 break;
 422
 423         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 424                 /* TBD: Exactly what does 'light' mean? */
 425                 break;
 426
 427         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 428                 /* TBD */
 429                 break;
 430
 431         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 432                 /* TBD */
 433                 break;
 434
 435         case ACPI_NOTIFY_POWER_FAULT:
 436                 /* TBD */
 437                 break;
 438
 439         default:
 440                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 441                                   "Received unknown/unsupported notification [%08x]\n",
 442                                   type));
 443                 break;
 444         }
 445
 446         acpi_bus_get_device(handle, &device);
 447         if (device) {
 448                 driver = device->driver;
 449                 if (driver && driver->ops.notify &&
 450                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 451                         driver->ops.notify(device, type);
 452         }
 453 }
 454
 455 /* --------------------------------------------------------------------------
 456                              Initialization/Cleanup
 457    -------------------------------------------------------------------------- */
 458
 459 static int __init acpi_bus_init_irq(void)
 460 {
 461         acpi_status status;
 462         char *message = NULL;
 463
 464
 465         /*
 466          * Let the system know what interrupt model we are using by
 467          * evaluating the \_PIC object, if exists.
 468          */
 469
 470         switch (acpi_irq_model) {
 471         case ACPI_IRQ_MODEL_PIC:
 472                 message = "PIC";
 473                 break;
 474         case ACPI_IRQ_MODEL_IOAPIC:
 475                 message = "IOAPIC";
 476                 break;
 477         case ACPI_IRQ_MODEL_IOSAPIC:
 478                 message = "IOSAPIC";
 479                 break;
 480         case ACPI_IRQ_MODEL_PLATFORM:
 481                 message = "platform specific model";
 482                 break;
 483         default:
 484                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 485                 return -ENODEV;
 486         }
 487
 488         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 489
 490         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
 491         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 492                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 493                 return -ENODEV;
 494         }
 495
 496         return 0;
 497 }
 498
 499 u8 acpi_gbl_permanent_mmap;
 500
 501
 502 void __init acpi_early_init(void)
 503 {
 504         acpi_status status;
 505
 506         if (acpi_disabled)
 507                 return;
 508
 509         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 510
 511         /* enable workarounds, unless strict ACPI spec. compliance */
 512         if (!acpi_strict)
 513                 acpi_gbl_enable_interpreter_slack = TRUE;
 514
 515         acpi_gbl_permanent_mmap = 1;
 516
 517         /*
 518          * If the machine falls into the DMI check table,
 519          * DSDT will be copied to memory
 520          */
 521         dmi_check_system(dsdt_dmi_table);
 522
 523         status = acpi_reallocate_root_table();
 524         if (ACPI_FAILURE(status)) {
 525                 printk(KERN_ERR PREFIX
 526                        "Unable to reallocate ACPI tables\n");
 527                 goto error0;
 528         }
 529
 530         status = acpi_initialize_subsystem();
 531         if (ACPI_FAILURE(status)) {
 532                 printk(KERN_ERR PREFIX
 533                        "Unable to initialize the ACPI Interpreter\n");
 534                 goto error0;
 535         }
 536
 537         status = acpi_load_tables();
 538         if (ACPI_FAILURE(status)) {
 539                 printk(KERN_ERR PREFIX
 540                        "Unable to load the System Description Tables\n");
 541                 goto error0;
 542         }
 543
 544 #ifdef CONFIG_X86
 545         if (!acpi_ioapic) {
 546                 /* compatible (0) means level (3) */
 547                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 548                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 549                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 550                 }
 551                 /* Set PIC-mode SCI trigger type */
 552                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 553                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 554         } else {
 555                 /*
 556                  * now that acpi_gbl_FADT is initialized,
 557                  * update it with result from INT_SRC_OVR parsing
 558                  */
 559                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 560         }
 561 #endif
 562
 563         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 564         if (ACPI_FAILURE(status)) {
 565                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 566                 goto error0;
 567         }
 568
 569         return;
 570
 571       error0:
 572         disable_acpi();
 573         return;
 574 }
 575
 576 static int __init acpi_bus_init(void)
 577 {
 578         int result;
 579         acpi_status status;
 580
 581         acpi_os_initialize1();
 582
 583         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 584         if (ACPI_FAILURE(status)) {
 585                 printk(KERN_ERR PREFIX
 586                        "Unable to start the ACPI Interpreter\n");
 587                 goto error1;
 588         }
 589
 590         /*
 591          * ACPI 2.0 requires the EC driver to be loaded and work before
 592          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 593          * is called).
 594          *
 595          * This is accomplished by looking for the ECDT table, and getting
 596          * the EC parameters out of that.
 597          */
 598         status = acpi_ec_ecdt_probe();
 599         /* Ignore result. Not having an ECDT is not fatal. */
 600
 601         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 602         if (ACPI_FAILURE(status)) {
 603                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 604                 goto error1;
 605         }
 606
 607         /*
 608          * _OSC method may exist in module level code,
 609          * so it must be run after ACPI_FULL_INITIALIZATION
 610          */
 611         acpi_bus_osc_support();
 612
 613         /*
 614          * _PDC control method may load dynamic SSDT tables,
 615          * and we need to install the table handler before that.
 616          */
 617         acpi_sysfs_init();
 618
 619         acpi_early_processor_set_pdc();
 620
 621         /*
 622          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 623          * is necessary to enable it as early as possible.
 624          */
 625         acpi_boot_ec_enable();
 626
 627         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 628
 629         /* Initialize sleep structures */
 630         acpi_sleep_init();
 631
 632         /*
 633          * Get the system interrupt model and evaluate \_PIC.
 634          */
 635         result = acpi_bus_init_irq();
 636         if (result)
 637                 goto error1;
 638
 639         /*
 640          * Register the for all standard device notifications.
 641          */
 642         status =
 643             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 644                                         &acpi_bus_notify, NULL);
 645         if (ACPI_FAILURE(status)) {
 646                 printk(KERN_ERR PREFIX
 647                        "Unable to register for device notifications\n");
 648                 goto error1;
 649         }
 650
 651         /*
 652          * Create the top ACPI proc directory
 653          */
 654         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 655
 656         return 0;
 657
 658         /* Mimic structured exception handling */
 659       error1:
 660         acpi_terminate();
 661         return -ENODEV;
 662 }
 663
 664 struct kobject *acpi_kobj;
 665 EXPORT_SYMBOL_GPL(acpi_kobj);
 666
 667 static int __init acpi_init(void)
 668 {
 669         int result;
 670
 671         if (acpi_disabled) {
 672                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 673                 return -ENODEV;
 674         }
 675
 676         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 677         if (!acpi_kobj) {
 678                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 679                 acpi_kobj = NULL;
 680         }
 681
 682         init_acpi_device_notify();
 683         result = acpi_bus_init();
 684         if (result) {
 685                 disable_acpi();
 686                 return result;
 687         }
 688
 689         pci_mmcfg_late_init();
 690         acpi_scan_init();
 691         acpi_ec_init();
 692         acpi_debugfs_init();
 693         acpi_sleep_proc_init();
 694         acpi_wakeup_device_init();
 695         return 0;
 696 }
 697
 698 subsys_initcall(acpi_init);