linux/drivers/acpi/bus.c
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   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
  49ACPI_MODULE_NAME("bus");
  50
  51struct acpi_device *acpi_root;
  52struct proc_dir_entry *acpi_root_dir;
  53EXPORT_SYMBOL(acpi_root_dir);
  54
  55#define STRUCT_TO_INT(s)        (*((int*)&s))
  56
  57
  58#ifdef CONFIG_X86
  59static 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
  67static 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
  83static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  84        {}
  85};
  86#endif
  87
  88/* --------------------------------------------------------------------------
  89                                Device Management
  90   -------------------------------------------------------------------------- */
  91
  92int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  93{
  94        acpi_status status = AE_OK;
  95
  96
  97        if (!device)
  98                return -EINVAL;
  99
 100        /* TBD: Support fixed-feature devices */
 101
 102        status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 103        if (ACPI_FAILURE(status) || !*device) {
 104                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 105                                  handle));
 106                return -ENODEV;
 107        }
 108
 109        return 0;
 110}
 111
 112EXPORT_SYMBOL(acpi_bus_get_device);
 113
 114acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 115                                       unsigned long long *sta)
 116{
 117        acpi_status status;
 118
 119        status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 120        if (ACPI_SUCCESS(status))
 121                return AE_OK;
 122
 123        if (status == AE_NOT_FOUND) {
 124                *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 125                       ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 126                return AE_OK;
 127        }
 128        return status;
 129}
 130
 131int acpi_bus_get_status(struct acpi_device *device)
 132{
 133        acpi_status status;
 134        unsigned long long sta;
 135
 136        status = acpi_bus_get_status_handle(device->handle, &sta);
 137        if (ACPI_FAILURE(status))
 138                return -ENODEV;
 139
 140        STRUCT_TO_INT(device->status) = (int) sta;
 141
 142        if (device->status.functional && !device->status.present) {
 143                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 144                       "functional but not present;\n",
 145                        device->pnp.bus_id,
 146                        (u32) STRUCT_TO_INT(device->status)));
 147        }
 148
 149        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 150                          device->pnp.bus_id,
 151                          (u32) STRUCT_TO_INT(device->status)));
 152        return 0;
 153}
 154EXPORT_SYMBOL(acpi_bus_get_status);
 155
 156void acpi_bus_private_data_handler(acpi_handle handle,
 157                                   void *context)
 158{
 159        return;
 160}
 161EXPORT_SYMBOL(acpi_bus_private_data_handler);
 162
 163int acpi_bus_get_private_data(acpi_handle handle, void **data)
 164{
 165        acpi_status status = AE_OK;
 166
 167        if (!*data)
 168                return -EINVAL;
 169
 170        status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 171        if (ACPI_FAILURE(status) || !*data) {
 172                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 173                                handle));
 174                return -ENODEV;
 175        }
 176
 177        return 0;
 178}
 179EXPORT_SYMBOL(acpi_bus_get_private_data);
 180
 181static void acpi_print_osc_error(acpi_handle handle,
 182        struct acpi_osc_context *context, char *error)
 183{
 184        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 185        int i;
 186
 187        if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 188                printk(KERN_DEBUG "%s\n", error);
 189        else {
 190                printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 191                kfree(buffer.pointer);
 192        }
 193        printk(KERN_DEBUG"_OSC request data:");
 194        for (i = 0; i < context->cap.length; i += sizeof(u32))
 195                printk("%x ", *((u32 *)(context->cap.pointer + i)));
 196        printk("\n");
 197}
 198
 199static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 200{
 201        int i;
 202        static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 203                24, 26, 28, 30, 32, 34};
 204
 205        if (strlen(str) != 36)
 206                return AE_BAD_PARAMETER;
 207        for (i = 0; i < 36; i++) {
 208                if (i == 8 || i == 13 || i == 18 || i == 23) {
 209                        if (str[i] != '-')
 210                                return AE_BAD_PARAMETER;
 211                } else if (!isxdigit(str[i]))
 212                        return AE_BAD_PARAMETER;
 213        }
 214        for (i = 0; i < 16; i++) {
 215                uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 216                uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 217        }
 218        return AE_OK;
 219}
 220
 221acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 222{
 223        acpi_status status;
 224        struct acpi_object_list input;
 225        union acpi_object in_params[4];
 226        union acpi_object *out_obj;
 227        u8 uuid[16];
 228        u32 errors;
 229        struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 230
 231        if (!context)
 232                return AE_ERROR;
 233        if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 234                return AE_ERROR;
 235        context->ret.length = ACPI_ALLOCATE_BUFFER;
 236        context->ret.pointer = NULL;
 237
 238        /* Setting up input parameters */
 239        input.count = 4;
 240        input.pointer = in_params;
 241        in_params[0].type               = ACPI_TYPE_BUFFER;
 242        in_params[0].buffer.length      = 16;
 243        in_params[0].buffer.pointer     = uuid;
 244        in_params[1].type               = ACPI_TYPE_INTEGER;
 245        in_params[1].integer.value      = context->rev;
 246        in_params[2].type               = ACPI_TYPE_INTEGER;
 247        in_params[2].integer.value      = context->cap.length/sizeof(u32);
 248        in_params[3].type               = ACPI_TYPE_BUFFER;
 249        in_params[3].buffer.length      = context->cap.length;
 250        in_params[3].buffer.pointer     = context->cap.pointer;
 251
 252        status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 253        if (ACPI_FAILURE(status))
 254                return status;
 255
 256        if (!output.length)
 257                return AE_NULL_OBJECT;
 258
 259        out_obj = output.pointer;
 260        if (out_obj->type != ACPI_TYPE_BUFFER
 261                || out_obj->buffer.length != context->cap.length) {
 262                acpi_print_osc_error(handle, context,
 263                        "_OSC evaluation returned wrong type");
 264                status = AE_TYPE;
 265                goto out_kfree;
 266        }
 267        /* Need to ignore the bit0 in result code */
 268        errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 269        if (errors) {
 270                if (errors & OSC_REQUEST_ERROR)
 271                        acpi_print_osc_error(handle, context,
 272                                "_OSC request failed");
 273                if (errors & OSC_INVALID_UUID_ERROR)
 274                        acpi_print_osc_error(handle, context,
 275                                "_OSC invalid UUID");
 276                if (errors & OSC_INVALID_REVISION_ERROR)
 277                        acpi_print_osc_error(handle, context,
 278                                "_OSC invalid revision");
 279                if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 280                        if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 281                            & OSC_QUERY_ENABLE)
 282                                goto out_success;
 283                        status = AE_SUPPORT;
 284                        goto out_kfree;
 285                }
 286                status = AE_ERROR;
 287                goto out_kfree;
 288        }
 289out_success:
 290        context->ret.length = out_obj->buffer.length;
 291        context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 292                                       context->ret.length, GFP_KERNEL);
 293        if (!context->ret.pointer) {
 294                status =  AE_NO_MEMORY;
 295                goto out_kfree;
 296        }
 297        status =  AE_OK;
 298
 299out_kfree:
 300        kfree(output.pointer);
 301        if (status != AE_OK)
 302                context->ret.pointer = NULL;
 303        return status;
 304}
 305EXPORT_SYMBOL(acpi_run_osc);
 306
 307bool osc_sb_apei_support_acked;
 308static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 309static void acpi_bus_osc_support(void)
 310{
 311        u32 capbuf[2];
 312        struct acpi_osc_context context = {
 313                .uuid_str = sb_uuid_str,
 314                .rev = 1,
 315                .cap.length = 8,
 316                .cap.pointer = capbuf,
 317        };
 318        acpi_handle handle;
 319
 320        capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 321        capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 322#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 323                        defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 324        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 325#endif
 326
 327#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 328        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 329#endif
 330
 331#ifdef ACPI_HOTPLUG_OST
 332        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 333#endif
 334
 335        if (!ghes_disable)
 336                capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 337        if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 338                return;
 339        if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 340                u32 *capbuf_ret = context.ret.pointer;
 341                if (context.ret.length > OSC_SUPPORT_TYPE)
 342                        osc_sb_apei_support_acked =
 343                                capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 344                kfree(context.ret.pointer);
 345        }
 346        /* do we need to check other returned cap? Sounds no */
 347}
 348
 349/* --------------------------------------------------------------------------
 350                                Event Management
 351   -------------------------------------------------------------------------- */
 352
 353#ifdef CONFIG_ACPI_PROC_EVENT
 354static DEFINE_SPINLOCK(acpi_bus_event_lock);
 355
 356LIST_HEAD(acpi_bus_event_list);
 357DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 358
 359extern int event_is_open;
 360
 361int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 362{
 363        struct acpi_bus_event *event;
 364        unsigned long flags = 0;
 365
 366        /* drop event on the floor if no one's listening */
 367        if (!event_is_open)
 368                return 0;
 369
 370        event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 371        if (!event)
 372                return -ENOMEM;
 373
 374        strcpy(event->device_class, device_class);
 375        strcpy(event->bus_id, bus_id);
 376        event->type = type;
 377        event->data = data;
 378
 379        spin_lock_irqsave(&acpi_bus_event_lock, flags);
 380        list_add_tail(&event->node, &acpi_bus_event_list);
 381        spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 382
 383        wake_up_interruptible(&acpi_bus_event_queue);
 384
 385        return 0;
 386
 387}
 388
 389EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 390
 391int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 392{
 393        if (!device)
 394                return -EINVAL;
 395        return acpi_bus_generate_proc_event4(device->pnp.device_class,
 396                                             device->pnp.bus_id, type, data);
 397}
 398
 399EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 400
 401int acpi_bus_receive_event(struct acpi_bus_event *event)
 402{
 403        unsigned long flags = 0;
 404        struct acpi_bus_event *entry = NULL;
 405
 406        DECLARE_WAITQUEUE(wait, current);
 407
 408
 409        if (!event)
 410                return -EINVAL;
 411
 412        if (list_empty(&acpi_bus_event_list)) {
 413
 414                set_current_state(TASK_INTERRUPTIBLE);
 415                add_wait_queue(&acpi_bus_event_queue, &wait);
 416
 417                if (list_empty(&acpi_bus_event_list))
 418                        schedule();
 419
 420                remove_wait_queue(&acpi_bus_event_queue, &wait);
 421                set_current_state(TASK_RUNNING);
 422
 423                if (signal_pending(current))
 424                        return -ERESTARTSYS;
 425        }
 426
 427        spin_lock_irqsave(&acpi_bus_event_lock, flags);
 428        if (!list_empty(&acpi_bus_event_list)) {
 429                entry = list_entry(acpi_bus_event_list.next,
 430                                   struct acpi_bus_event, node);
 431                list_del(&entry->node);
 432        }
 433        spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 434
 435        if (!entry)
 436                return -ENODEV;
 437
 438        memcpy(event, entry, sizeof(struct acpi_bus_event));
 439
 440        kfree(entry);
 441
 442        return 0;
 443}
 444
 445#endif  /* CONFIG_ACPI_PROC_EVENT */
 446
 447/* --------------------------------------------------------------------------
 448                             Notification Handling
 449   -------------------------------------------------------------------------- */
 450
 451static void acpi_bus_check_device(acpi_handle handle)
 452{
 453        struct acpi_device *device;
 454        acpi_status status;
 455        struct acpi_device_status old_status;
 456
 457        if (acpi_bus_get_device(handle, &device))
 458                return;
 459        if (!device)
 460                return;
 461
 462        old_status = device->status;
 463
 464        /*
 465         * Make sure this device's parent is present before we go about
 466         * messing with the device.
 467         */
 468        if (device->parent && !device->parent->status.present) {
 469                device->status = device->parent->status;
 470                return;
 471        }
 472
 473        status = acpi_bus_get_status(device);
 474        if (ACPI_FAILURE(status))
 475                return;
 476
 477        if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 478                return;
 479
 480        /*
 481         * Device Insertion/Removal
 482         */
 483        if ((device->status.present) && !(old_status.present)) {
 484                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 485                /* TBD: Handle device insertion */
 486        } else if (!(device->status.present) && (old_status.present)) {
 487                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 488                /* TBD: Handle device removal */
 489        }
 490}
 491
 492static void acpi_bus_check_scope(acpi_handle handle)
 493{
 494        /* Status Change? */
 495        acpi_bus_check_device(handle);
 496
 497        /*
 498         * TBD: Enumerate child devices within this device's scope and
 499         *       run acpi_bus_check_device()'s on them.
 500         */
 501}
 502
 503static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 504int register_acpi_bus_notifier(struct notifier_block *nb)
 505{
 506        return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 507}
 508EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 509
 510void unregister_acpi_bus_notifier(struct notifier_block *nb)
 511{
 512        blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 513}
 514EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 515
 516/**
 517 * acpi_bus_notify
 518 * ---------------
 519 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 520 */
 521static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 522{
 523        struct acpi_device *device = NULL;
 524        struct acpi_driver *driver;
 525
 526        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 527                          type, handle));
 528
 529        blocking_notifier_call_chain(&acpi_bus_notify_list,
 530                type, (void *)handle);
 531
 532        switch (type) {
 533
 534        case ACPI_NOTIFY_BUS_CHECK:
 535                acpi_bus_check_scope(handle);
 536                /*
 537                 * TBD: We'll need to outsource certain events to non-ACPI
 538                 *      drivers via the device manager (device.c).
 539                 */
 540                break;
 541
 542        case ACPI_NOTIFY_DEVICE_CHECK:
 543                acpi_bus_check_device(handle);
 544                /*
 545                 * TBD: We'll need to outsource certain events to non-ACPI
 546                 *      drivers via the device manager (device.c).
 547                 */
 548                break;
 549
 550        case ACPI_NOTIFY_DEVICE_WAKE:
 551                /* TBD */
 552                break;
 553
 554        case ACPI_NOTIFY_EJECT_REQUEST:
 555                /* TBD */
 556                break;
 557
 558        case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 559                /* TBD: Exactly what does 'light' mean? */
 560                break;
 561
 562        case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 563                /* TBD */
 564                break;
 565
 566        case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 567                /* TBD */
 568                break;
 569
 570        case ACPI_NOTIFY_POWER_FAULT:
 571                /* TBD */
 572                break;
 573
 574        default:
 575                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 576                                  "Received unknown/unsupported notification [%08x]\n",
 577                                  type));
 578                break;
 579        }
 580
 581        acpi_bus_get_device(handle, &device);
 582        if (device) {
 583                driver = device->driver;
 584                if (driver && driver->ops.notify &&
 585                    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 586                        driver->ops.notify(device, type);
 587        }
 588}
 589
 590/* --------------------------------------------------------------------------
 591                             Initialization/Cleanup
 592   -------------------------------------------------------------------------- */
 593
 594static int __init acpi_bus_init_irq(void)
 595{
 596        acpi_status status = AE_OK;
 597        union acpi_object arg = { ACPI_TYPE_INTEGER };
 598        struct acpi_object_list arg_list = { 1, &arg };
 599        char *message = NULL;
 600
 601
 602        /*
 603         * Let the system know what interrupt model we are using by
 604         * evaluating the \_PIC object, if exists.
 605         */
 606
 607        switch (acpi_irq_model) {
 608        case ACPI_IRQ_MODEL_PIC:
 609                message = "PIC";
 610                break;
 611        case ACPI_IRQ_MODEL_IOAPIC:
 612                message = "IOAPIC";
 613                break;
 614        case ACPI_IRQ_MODEL_IOSAPIC:
 615                message = "IOSAPIC";
 616                break;
 617        case ACPI_IRQ_MODEL_PLATFORM:
 618                message = "platform specific model";
 619                break;
 620        default:
 621                printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 622                return -ENODEV;
 623        }
 624
 625        printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 626
 627        arg.integer.value = acpi_irq_model;
 628
 629        status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 630        if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 631                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 632                return -ENODEV;
 633        }
 634
 635        return 0;
 636}
 637
 638u8 acpi_gbl_permanent_mmap;
 639
 640
 641void __init acpi_early_init(void)
 642{
 643        acpi_status status = AE_OK;
 644
 645        if (acpi_disabled)
 646                return;
 647
 648        printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 649
 650        /* enable workarounds, unless strict ACPI spec. compliance */
 651        if (!acpi_strict)
 652                acpi_gbl_enable_interpreter_slack = TRUE;
 653
 654        acpi_gbl_permanent_mmap = 1;
 655
 656        /*
 657         * If the machine falls into the DMI check table,
 658         * DSDT will be copied to memory
 659         */
 660        dmi_check_system(dsdt_dmi_table);
 661
 662        status = acpi_reallocate_root_table();
 663        if (ACPI_FAILURE(status)) {
 664                printk(KERN_ERR PREFIX
 665                       "Unable to reallocate ACPI tables\n");
 666                goto error0;
 667        }
 668
 669        status = acpi_initialize_subsystem();
 670        if (ACPI_FAILURE(status)) {
 671                printk(KERN_ERR PREFIX
 672                       "Unable to initialize the ACPI Interpreter\n");
 673                goto error0;
 674        }
 675
 676        status = acpi_load_tables();
 677        if (ACPI_FAILURE(status)) {
 678                printk(KERN_ERR PREFIX
 679                       "Unable to load the System Description Tables\n");
 680                goto error0;
 681        }
 682
 683#ifdef CONFIG_X86
 684        if (!acpi_ioapic) {
 685                /* compatible (0) means level (3) */
 686                if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 687                        acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 688                        acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 689                }
 690                /* Set PIC-mode SCI trigger type */
 691                acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 692                                         (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 693        } else {
 694                /*
 695                 * now that acpi_gbl_FADT is initialized,
 696                 * update it with result from INT_SRC_OVR parsing
 697                 */
 698                acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 699        }
 700#endif
 701
 702        status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 703        if (ACPI_FAILURE(status)) {
 704                printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 705                goto error0;
 706        }
 707
 708        return;
 709
 710      error0:
 711        disable_acpi();
 712        return;
 713}
 714
 715static int __init acpi_bus_init(void)
 716{
 717        int result = 0;
 718        acpi_status status = AE_OK;
 719        extern acpi_status acpi_os_initialize1(void);
 720
 721        acpi_os_initialize1();
 722
 723        status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 724        if (ACPI_FAILURE(status)) {
 725                printk(KERN_ERR PREFIX
 726                       "Unable to start the ACPI Interpreter\n");
 727                goto error1;
 728        }
 729
 730        /*
 731         * ACPI 2.0 requires the EC driver to be loaded and work before
 732         * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 733         * is called).
 734         *
 735         * This is accomplished by looking for the ECDT table, and getting
 736         * the EC parameters out of that.
 737         */
 738        status = acpi_ec_ecdt_probe();
 739        /* Ignore result. Not having an ECDT is not fatal. */
 740
 741        status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 742        if (ACPI_FAILURE(status)) {
 743                printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 744                goto error1;
 745        }
 746
 747        /*
 748         * _OSC method may exist in module level code,
 749         * so it must be run after ACPI_FULL_INITIALIZATION
 750         */
 751        acpi_bus_osc_support();
 752
 753        /*
 754         * _PDC control method may load dynamic SSDT tables,
 755         * and we need to install the table handler before that.
 756         */
 757        acpi_sysfs_init();
 758
 759        acpi_early_processor_set_pdc();
 760
 761        /*
 762         * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 763         * is necessary to enable it as early as possible.
 764         */
 765        acpi_boot_ec_enable();
 766
 767        printk(KERN_INFO PREFIX "Interpreter enabled\n");
 768
 769        /* Initialize sleep structures */
 770        acpi_sleep_init();
 771
 772        /*
 773         * Get the system interrupt model and evaluate \_PIC.
 774         */
 775        result = acpi_bus_init_irq();
 776        if (result)
 777                goto error1;
 778
 779        /*
 780         * Register the for all standard device notifications.
 781         */
 782        status =
 783            acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 784                                        &acpi_bus_notify, NULL);
 785        if (ACPI_FAILURE(status)) {
 786                printk(KERN_ERR PREFIX
 787                       "Unable to register for device notifications\n");
 788                goto error1;
 789        }
 790
 791        /*
 792         * Create the top ACPI proc directory
 793         */
 794        acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 795
 796        return 0;
 797
 798        /* Mimic structured exception handling */
 799      error1:
 800        acpi_terminate();
 801        return -ENODEV;
 802}
 803
 804struct kobject *acpi_kobj;
 805EXPORT_SYMBOL_GPL(acpi_kobj);
 806
 807static int __init acpi_init(void)
 808{
 809        int result;
 810
 811        if (acpi_disabled) {
 812                printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 813                return -ENODEV;
 814        }
 815
 816        acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 817        if (!acpi_kobj) {
 818                printk(KERN_WARNING "%s: kset create error\n", __func__);
 819                acpi_kobj = NULL;
 820        }
 821
 822        init_acpi_device_notify();
 823        result = acpi_bus_init();
 824        if (result) {
 825                disable_acpi();
 826                return result;
 827        }
 828
 829        pci_mmcfg_late_init();
 830        acpi_scan_init();
 831        acpi_ec_init();
 832        acpi_debugfs_init();
 833        acpi_sleep_proc_init();
 834        acpi_wakeup_device_init();
 835        return 0;
 836}
 837
 838subsys_initcall(acpi_init);
 839
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