drivers/acpi/acpica/tbxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxface - Public interfaces to the ACPI subsystem
   4  *                         ACPI table oriented interfaces
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2011, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <linux/export.h>
  46 #include <acpi/acpi.h>
  47 #include "accommon.h"
  48 #include "acnamesp.h"
  49 #include "actables.h"
  50
  51 #define _COMPONENT          ACPI_TABLES
  52 ACPI_MODULE_NAME("tbxface")
  53
  54 /* Local prototypes */
  55 static acpi_status acpi_tb_load_namespace(void);
  56
  57 static int no_auto_ssdt;
  58
  59 /*******************************************************************************
  60  *
  61  * FUNCTION:    acpi_allocate_root_table
  62  *
  63  * PARAMETERS:  initial_table_count - Size of initial_table_array, in number of
  64  *                                    struct acpi_table_desc structures
  65  *
  66  * RETURN:      Status
  67  *
  68  * DESCRIPTION: Allocate a root table array. Used by i_aSL compiler and
  69  *              acpi_initialize_tables.
  70  *
  71  ******************************************************************************/
  72
  73 acpi_status acpi_allocate_root_table(u32 initial_table_count)
  74 {
  75
  76         acpi_gbl_root_table_list.max_table_count = initial_table_count;
  77         acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
  78
  79         return (acpi_tb_resize_root_table_list());
  80 }
  81
  82 /*******************************************************************************
  83  *
  84  * FUNCTION:    acpi_initialize_tables
  85  *
  86  * PARAMETERS:  initial_table_array - Pointer to an array of pre-allocated
  87  *                                    struct acpi_table_desc structures. If NULL, the
  88  *                                    array is dynamically allocated.
  89  *              initial_table_count - Size of initial_table_array, in number of
  90  *                                    struct acpi_table_desc structures
  91  *              allow_realloc       - Flag to tell Table Manager if resize of
  92  *                                    pre-allocated array is allowed. Ignored
  93  *                                    if initial_table_array is NULL.
  94  *
  95  * RETURN:      Status
  96  *
  97  * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
  98  *
  99  * NOTE:        Allows static allocation of the initial table array in order
 100  *              to avoid the use of dynamic memory in confined environments
 101  *              such as the kernel boot sequence where it may not be available.
 102  *
 103  *              If the host OS memory managers are initialized, use NULL for
 104  *              initial_table_array, and the table will be dynamically allocated.
 105  *
 106  ******************************************************************************/
 107
 108 acpi_status __init
 109 acpi_initialize_tables(struct acpi_table_desc * initial_table_array,
 110                        u32 initial_table_count, u8 allow_resize)
 111 {
 112         acpi_physical_address rsdp_address;
 113         acpi_status status;
 114
 115         ACPI_FUNCTION_TRACE(acpi_initialize_tables);
 116
 117         /*
 118          * Set up the Root Table Array
 119          * Allocate the table array if requested
 120          */
 121         if (!initial_table_array) {
 122                 status = acpi_allocate_root_table(initial_table_count);
 123                 if (ACPI_FAILURE(status)) {
 124                         return_ACPI_STATUS(status);
 125                 }
 126         } else {
 127                 /* Root Table Array has been statically allocated by the host */
 128
 129                 ACPI_MEMSET(initial_table_array, 0,
 130                             (acpi_size) initial_table_count *
 131                             sizeof(struct acpi_table_desc));
 132
 133                 acpi_gbl_root_table_list.tables = initial_table_array;
 134                 acpi_gbl_root_table_list.max_table_count = initial_table_count;
 135                 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
 136                 if (allow_resize) {
 137                         acpi_gbl_root_table_list.flags |=
 138                             ACPI_ROOT_ALLOW_RESIZE;
 139                 }
 140         }
 141
 142         /* Get the address of the RSDP */
 143
 144         rsdp_address = acpi_os_get_root_pointer();
 145         if (!rsdp_address) {
 146                 return_ACPI_STATUS(AE_NOT_FOUND);
 147         }
 148
 149         /*
 150          * Get the root table (RSDT or XSDT) and extract all entries to the local
 151          * Root Table Array. This array contains the information of the RSDT/XSDT
 152          * in a common, more useable format.
 153          */
 154         status = acpi_tb_parse_root_table(rsdp_address);
 155         return_ACPI_STATUS(status);
 156 }
 157
 158 /*******************************************************************************
 159  *
 160  * FUNCTION:    acpi_reallocate_root_table
 161  *
 162  * PARAMETERS:  None
 163  *
 164  * RETURN:      Status
 165  *
 166  * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
 167  *              root list from the previously provided scratch area. Should
 168  *              be called once dynamic memory allocation is available in the
 169  *              kernel
 170  *
 171  ******************************************************************************/
 172 acpi_status acpi_reallocate_root_table(void)
 173 {
 174         struct acpi_table_desc *tables;
 175         acpi_size new_size;
 176         acpi_size current_size;
 177
 178         ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
 179
 180         /*
 181          * Only reallocate the root table if the host provided a static buffer
 182          * for the table array in the call to acpi_initialize_tables.
 183          */
 184         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 185                 return_ACPI_STATUS(AE_SUPPORT);
 186         }
 187
 188         /*
 189          * Get the current size of the root table and add the default
 190          * increment to create the new table size.
 191          */
 192         current_size = (acpi_size)
 193             acpi_gbl_root_table_list.current_table_count *
 194             sizeof(struct acpi_table_desc);
 195
 196         new_size = current_size +
 197             (ACPI_ROOT_TABLE_SIZE_INCREMENT * sizeof(struct acpi_table_desc));
 198
 199         /* Create new array and copy the old array */
 200
 201         tables = ACPI_ALLOCATE_ZEROED(new_size);
 202         if (!tables) {
 203                 return_ACPI_STATUS(AE_NO_MEMORY);
 204         }
 205
 206         ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, current_size);
 207
 208         /*
 209          * Update the root table descriptor. The new size will be the current
 210          * number of tables plus the increment, independent of the reserved
 211          * size of the original table list.
 212          */
 213         acpi_gbl_root_table_list.tables = tables;
 214         acpi_gbl_root_table_list.max_table_count =
 215             acpi_gbl_root_table_list.current_table_count +
 216             ACPI_ROOT_TABLE_SIZE_INCREMENT;
 217         acpi_gbl_root_table_list.flags =
 218             ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
 219
 220         return_ACPI_STATUS(AE_OK);
 221 }
 222
 223 /*******************************************************************************
 224  *
 225  * FUNCTION:    acpi_load_table
 226  *
 227  * PARAMETERS:  table_ptr       - pointer to a buffer containing the entire
 228  *                                table to be loaded
 229  *
 230  * RETURN:      Status
 231  *
 232  * DESCRIPTION: This function is called to load a table from the caller's
 233  *              buffer. The buffer must contain an entire ACPI Table including
 234  *              a valid header. The header fields will be verified, and if it
 235  *              is determined that the table is invalid, the call will fail.
 236  *
 237  ******************************************************************************/
 238 acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
 239 {
 240         acpi_status status;
 241         u32 table_index;
 242         struct acpi_table_desc table_desc;
 243
 244         if (!table_ptr)
 245                 return AE_BAD_PARAMETER;
 246
 247         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
 248         table_desc.pointer = table_ptr;
 249         table_desc.length = table_ptr->length;
 250         table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
 251
 252         /*
 253          * Install the new table into the local data structures
 254          */
 255         status = acpi_tb_add_table(&table_desc, &table_index);
 256         if (ACPI_FAILURE(status)) {
 257                 return status;
 258         }
 259         status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
 260         return status;
 261 }
 262
 263 ACPI_EXPORT_SYMBOL(acpi_load_table)
 264
 265 /*******************************************************************************
 266  *
 267  * FUNCTION:    acpi_get_table_header
 268  *
 269  * PARAMETERS:  Signature           - ACPI signature of needed table
 270  *              Instance            - Which instance (for SSDTs)
 271  *              out_table_header    - The pointer to the table header to fill
 272  *
 273  * RETURN:      Status and pointer to mapped table header
 274  *
 275  * DESCRIPTION: Finds an ACPI table header.
 276  *
 277  * NOTE:        Caller is responsible in unmapping the header with
 278  *              acpi_os_unmap_memory
 279  *
 280  ******************************************************************************/
 281 acpi_status
 282 acpi_get_table_header(char *signature,
 283                       u32 instance, struct acpi_table_header *out_table_header)
 284 {
 285        u32 i;
 286        u32 j;
 287         struct acpi_table_header *header;
 288
 289         /* Parameter validation */
 290
 291         if (!signature || !out_table_header) {
 292                 return (AE_BAD_PARAMETER);
 293         }
 294
 295         /* Walk the root table list */
 296
 297         for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
 298              i++) {
 299                 if (!ACPI_COMPARE_NAME
 300                     (&(acpi_gbl_root_table_list.tables[i].signature),
 301                      signature)) {
 302                         continue;
 303                 }
 304
 305                 if (++j < instance) {
 306                         continue;
 307                 }
 308
 309                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
 310                         if ((acpi_gbl_root_table_list.tables[i].flags &
 311                              ACPI_TABLE_ORIGIN_MASK) ==
 312                             ACPI_TABLE_ORIGIN_MAPPED) {
 313                                 header =
 314                                     acpi_os_map_memory(acpi_gbl_root_table_list.
 315                                                        tables[i].address,
 316                                                        sizeof(struct
 317                                                               acpi_table_header));
 318                                 if (!header) {
 319                                         return AE_NO_MEMORY;
 320                                 }
 321                                 ACPI_MEMCPY(out_table_header, header,
 322                                             sizeof(struct acpi_table_header));
 323                                 acpi_os_unmap_memory(header,
 324                                                      sizeof(struct
 325                                                             acpi_table_header));
 326                         } else {
 327                                 return AE_NOT_FOUND;
 328                         }
 329                 } else {
 330                         ACPI_MEMCPY(out_table_header,
 331                                     acpi_gbl_root_table_list.tables[i].pointer,
 332                                     sizeof(struct acpi_table_header));
 333                 }
 334                 return (AE_OK);
 335         }
 336
 337         return (AE_NOT_FOUND);
 338 }
 339
 340 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
 341
 342 /*******************************************************************************
 343  *
 344  * FUNCTION:    acpi_unload_table_id
 345  *
 346  * PARAMETERS:  id            - Owner ID of the table to be removed.
 347  *
 348  * RETURN:      Status
 349  *
 350  * DESCRIPTION: This routine is used to force the unload of a table (by id)
 351  *
 352  ******************************************************************************/
 353 acpi_status acpi_unload_table_id(acpi_owner_id id)
 354 {
 355         int i;
 356         acpi_status status = AE_NOT_EXIST;
 357
 358         ACPI_FUNCTION_TRACE(acpi_unload_table_id);
 359
 360         /* Find table in the global table list */
 361         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 362                 if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
 363                         continue;
 364                 }
 365                 /*
 366                  * Delete all namespace objects owned by this table. Note that these
 367                  * objects can appear anywhere in the namespace by virtue of the AML
 368                  * "Scope" operator. Thus, we need to track ownership by an ID, not
 369                  * simply a position within the hierarchy
 370                  */
 371                 acpi_tb_delete_namespace_by_owner(i);
 372                 status = acpi_tb_release_owner_id(i);
 373                 acpi_tb_set_table_loaded_flag(i, FALSE);
 374                 break;
 375         }
 376         return_ACPI_STATUS(status);
 377 }
 378
 379 ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
 380
 381 /*******************************************************************************
 382  *
 383  * FUNCTION:    acpi_get_table_with_size
 384  *
 385  * PARAMETERS:  Signature           - ACPI signature of needed table
 386  *              Instance            - Which instance (for SSDTs)
 387  *              out_table           - Where the pointer to the table is returned
 388  *
 389  * RETURN:      Status and pointer to table
 390  *
 391  * DESCRIPTION: Finds and verifies an ACPI table.
 392  *
 393  ******************************************************************************/
 394 acpi_status
 395 acpi_get_table_with_size(char *signature,
 396                u32 instance, struct acpi_table_header **out_table,
 397                acpi_size *tbl_size)
 398 {
 399        u32 i;
 400        u32 j;
 401         acpi_status status;
 402
 403         /* Parameter validation */
 404
 405         if (!signature || !out_table) {
 406                 return (AE_BAD_PARAMETER);
 407         }
 408
 409         /* Walk the root table list */
 410
 411         for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
 412              i++) {
 413                 if (!ACPI_COMPARE_NAME
 414                     (&(acpi_gbl_root_table_list.tables[i].signature),
 415                      signature)) {
 416                         continue;
 417                 }
 418
 419                 if (++j < instance) {
 420                         continue;
 421                 }
 422
 423                 status =
 424                     acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
 425                 if (ACPI_SUCCESS(status)) {
 426                         *out_table = acpi_gbl_root_table_list.tables[i].pointer;
 427                         *tbl_size = acpi_gbl_root_table_list.tables[i].length;
 428                 }
 429
 430                 if (!acpi_gbl_permanent_mmap) {
 431                         acpi_gbl_root_table_list.tables[i].pointer = NULL;
 432                 }
 433
 434                 return (status);
 435         }
 436
 437         return (AE_NOT_FOUND);
 438 }
 439 ACPI_EXPORT_SYMBOL(acpi_get_table_with_size)
 440
 441 acpi_status
 442 acpi_get_table(char *signature,
 443                u32 instance, struct acpi_table_header **out_table)
 444 {
 445         acpi_size tbl_size;
 446
 447         return acpi_get_table_with_size(signature,
 448                        instance, out_table, &tbl_size);
 449 }
 450 ACPI_EXPORT_SYMBOL(acpi_get_table)
 451
 452 /*******************************************************************************
 453  *
 454  * FUNCTION:    acpi_get_table_by_index
 455  *
 456  * PARAMETERS:  table_index         - Table index
 457  *              Table               - Where the pointer to the table is returned
 458  *
 459  * RETURN:      Status and pointer to the table
 460  *
 461  * DESCRIPTION: Obtain a table by an index into the global table list.
 462  *
 463  ******************************************************************************/
 464 acpi_status
 465 acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
 466 {
 467         acpi_status status;
 468
 469         ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
 470
 471         /* Parameter validation */
 472
 473         if (!table) {
 474                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 475         }
 476
 477         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 478
 479         /* Validate index */
 480
 481         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 482                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 483                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 484         }
 485
 486         if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
 487
 488                 /* Table is not mapped, map it */
 489
 490                 status =
 491                     acpi_tb_verify_table(&acpi_gbl_root_table_list.
 492                                          tables[table_index]);
 493                 if (ACPI_FAILURE(status)) {
 494                         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 495                         return_ACPI_STATUS(status);
 496                 }
 497         }
 498
 499         *table = acpi_gbl_root_table_list.tables[table_index].pointer;
 500         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 501         return_ACPI_STATUS(AE_OK);
 502 }
 503
 504 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
 505
 506 /*******************************************************************************
 507  *
 508  * FUNCTION:    acpi_tb_load_namespace
 509  *
 510  * PARAMETERS:  None
 511  *
 512  * RETURN:      Status
 513  *
 514  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
 515  *              the RSDT/XSDT.
 516  *
 517  ******************************************************************************/
 518 static acpi_status acpi_tb_load_namespace(void)
 519 {
 520         acpi_status status;
 521         u32 i;
 522         struct acpi_table_header *new_dsdt;
 523
 524         ACPI_FUNCTION_TRACE(tb_load_namespace);
 525
 526         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 527
 528         /*
 529          * Load the namespace. The DSDT is required, but any SSDT and
 530          * PSDT tables are optional. Verify the DSDT.
 531          */
 532         if (!acpi_gbl_root_table_list.current_table_count ||
 533             !ACPI_COMPARE_NAME(&
 534                                (acpi_gbl_root_table_list.
 535                                 tables[ACPI_TABLE_INDEX_DSDT].signature),
 536                                ACPI_SIG_DSDT)
 537             ||
 538             ACPI_FAILURE(acpi_tb_verify_table
 539                          (&acpi_gbl_root_table_list.
 540                           tables[ACPI_TABLE_INDEX_DSDT]))) {
 541                 status = AE_NO_ACPI_TABLES;
 542                 goto unlock_and_exit;
 543         }
 544
 545         /*
 546          * Save the DSDT pointer for simple access. This is the mapped memory
 547          * address. We must take care here because the address of the .Tables
 548          * array can change dynamically as tables are loaded at run-time. Note:
 549          * .Pointer field is not validated until after call to acpi_tb_verify_table.
 550          */
 551         acpi_gbl_DSDT =
 552             acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer;
 553
 554         /*
 555          * Optionally copy the entire DSDT to local memory (instead of simply
 556          * mapping it.) There are some BIOSs that corrupt or replace the original
 557          * DSDT, creating the need for this option. Default is FALSE, do not copy
 558          * the DSDT.
 559          */
 560         if (acpi_gbl_copy_dsdt_locally) {
 561                 new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT);
 562                 if (new_dsdt) {
 563                         acpi_gbl_DSDT = new_dsdt;
 564                 }
 565         }
 566
 567         /*
 568          * Save the original DSDT header for detection of table corruption
 569          * and/or replacement of the DSDT from outside the OS.
 570          */
 571         ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
 572                     sizeof(struct acpi_table_header));
 573
 574         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 575
 576         /* Load and parse tables */
 577
 578         status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
 579         if (ACPI_FAILURE(status)) {
 580                 return_ACPI_STATUS(status);
 581         }
 582
 583         /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
 584
 585         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 586         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 587                 if ((!ACPI_COMPARE_NAME
 588                      (&(acpi_gbl_root_table_list.tables[i].signature),
 589                       ACPI_SIG_SSDT)
 590                      &&
 591                      !ACPI_COMPARE_NAME(&
 592                                         (acpi_gbl_root_table_list.tables[i].
 593                                          signature), ACPI_SIG_PSDT))
 594                     ||
 595                     ACPI_FAILURE(acpi_tb_verify_table
 596                                  (&acpi_gbl_root_table_list.tables[i]))) {
 597                         continue;
 598                 }
 599
 600                 if (no_auto_ssdt) {
 601                         printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
 602                         continue;
 603                 }
 604
 605                 /* Ignore errors while loading tables, get as many as possible */
 606
 607                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 608                 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
 609                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 610         }
 611
 612         ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
 613
 614       unlock_and_exit:
 615         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 616         return_ACPI_STATUS(status);
 617 }
 618
 619 /*******************************************************************************
 620  *
 621  * FUNCTION:    acpi_load_tables
 622  *
 623  * PARAMETERS:  None
 624  *
 625  * RETURN:      Status
 626  *
 627  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
 628  *
 629  ******************************************************************************/
 630
 631 acpi_status acpi_load_tables(void)
 632 {
 633         acpi_status status;
 634
 635         ACPI_FUNCTION_TRACE(acpi_load_tables);
 636
 637         /* Load the namespace from the tables */
 638
 639         status = acpi_tb_load_namespace();
 640         if (ACPI_FAILURE(status)) {
 641                 ACPI_EXCEPTION((AE_INFO, status,
 642                                 "While loading namespace from ACPI tables"));
 643         }
 644
 645         return_ACPI_STATUS(status);
 646 }
 647
 648 ACPI_EXPORT_SYMBOL(acpi_load_tables)
 649
 650
 651 /*******************************************************************************
 652  *
 653  * FUNCTION:    acpi_install_table_handler
 654  *
 655  * PARAMETERS:  Handler         - Table event handler
 656  *              Context         - Value passed to the handler on each event
 657  *
 658  * RETURN:      Status
 659  *
 660  * DESCRIPTION: Install table event handler
 661  *
 662  ******************************************************************************/
 663 acpi_status
 664 acpi_install_table_handler(acpi_tbl_handler handler, void *context)
 665 {
 666         acpi_status status;
 667
 668         ACPI_FUNCTION_TRACE(acpi_install_table_handler);
 669
 670         if (!handler) {
 671                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 672         }
 673
 674         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 675         if (ACPI_FAILURE(status)) {
 676                 return_ACPI_STATUS(status);
 677         }
 678
 679         /* Don't allow more than one handler */
 680
 681         if (acpi_gbl_table_handler) {
 682                 status = AE_ALREADY_EXISTS;
 683                 goto cleanup;
 684         }
 685
 686         /* Install the handler */
 687
 688         acpi_gbl_table_handler = handler;
 689         acpi_gbl_table_handler_context = context;
 690
 691       cleanup:
 692         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 693         return_ACPI_STATUS(status);
 694 }
 695
 696 ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
 697
 698 /*******************************************************************************
 699  *
 700  * FUNCTION:    acpi_remove_table_handler
 701  *
 702  * PARAMETERS:  Handler         - Table event handler that was installed
 703  *                                previously.
 704  *
 705  * RETURN:      Status
 706  *
 707  * DESCRIPTION: Remove table event handler
 708  *
 709  ******************************************************************************/
 710 acpi_status acpi_remove_table_handler(acpi_tbl_handler handler)
 711 {
 712         acpi_status status;
 713
 714         ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
 715
 716         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 717         if (ACPI_FAILURE(status)) {
 718                 return_ACPI_STATUS(status);
 719         }
 720
 721         /* Make sure that the installed handler is the same */
 722
 723         if (!handler || handler != acpi_gbl_table_handler) {
 724                 status = AE_BAD_PARAMETER;
 725                 goto cleanup;
 726         }
 727
 728         /* Remove the handler */
 729
 730         acpi_gbl_table_handler = NULL;
 731
 732       cleanup:
 733         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 734         return_ACPI_STATUS(status);
 735 }
 736
 737 ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
 738
 739
 740 static int __init acpi_no_auto_ssdt_setup(char *s) {
 741
 742         printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");
 743
 744         no_auto_ssdt = 1;
 745
 746         return 1;
 747 }
 748
 749 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);