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 - 2012, 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
 440 acpi_status
 441 acpi_get_table(char *signature,
 442                u32 instance, struct acpi_table_header **out_table)
 443 {
 444         acpi_size tbl_size;
 445
 446         return acpi_get_table_with_size(signature,
 447                        instance, out_table, &tbl_size);
 448 }
 449 ACPI_EXPORT_SYMBOL(acpi_get_table)
 450
 451 /*******************************************************************************
 452  *
 453  * FUNCTION:    acpi_get_table_by_index
 454  *
 455  * PARAMETERS:  table_index         - Table index
 456  *              Table               - Where the pointer to the table is returned
 457  *
 458  * RETURN:      Status and pointer to the table
 459  *
 460  * DESCRIPTION: Obtain a table by an index into the global table list.
 461  *
 462  ******************************************************************************/
 463 acpi_status
 464 acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
 465 {
 466         acpi_status status;
 467
 468         ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
 469
 470         /* Parameter validation */
 471
 472         if (!table) {
 473                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 474         }
 475
 476         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 477
 478         /* Validate index */
 479
 480         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 481                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 482                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 483         }
 484
 485         if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
 486
 487                 /* Table is not mapped, map it */
 488
 489                 status =
 490                     acpi_tb_verify_table(&acpi_gbl_root_table_list.
 491                                          tables[table_index]);
 492                 if (ACPI_FAILURE(status)) {
 493                         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 494                         return_ACPI_STATUS(status);
 495                 }
 496         }
 497
 498         *table = acpi_gbl_root_table_list.tables[table_index].pointer;
 499         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 500         return_ACPI_STATUS(AE_OK);
 501 }
 502
 503 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
 504
 505 /*******************************************************************************
 506  *
 507  * FUNCTION:    acpi_tb_load_namespace
 508  *
 509  * PARAMETERS:  None
 510  *
 511  * RETURN:      Status
 512  *
 513  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
 514  *              the RSDT/XSDT.
 515  *
 516  ******************************************************************************/
 517 static acpi_status acpi_tb_load_namespace(void)
 518 {
 519         acpi_status status;
 520         u32 i;
 521         struct acpi_table_header *new_dsdt;
 522
 523         ACPI_FUNCTION_TRACE(tb_load_namespace);
 524
 525         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 526
 527         /*
 528          * Load the namespace. The DSDT is required, but any SSDT and
 529          * PSDT tables are optional. Verify the DSDT.
 530          */
 531         if (!acpi_gbl_root_table_list.current_table_count ||
 532             !ACPI_COMPARE_NAME(&
 533                                (acpi_gbl_root_table_list.
 534                                 tables[ACPI_TABLE_INDEX_DSDT].signature),
 535                                ACPI_SIG_DSDT)
 536             ||
 537             ACPI_FAILURE(acpi_tb_verify_table
 538                          (&acpi_gbl_root_table_list.
 539                           tables[ACPI_TABLE_INDEX_DSDT]))) {
 540                 status = AE_NO_ACPI_TABLES;
 541                 goto unlock_and_exit;
 542         }
 543
 544         /*
 545          * Save the DSDT pointer for simple access. This is the mapped memory
 546          * address. We must take care here because the address of the .Tables
 547          * array can change dynamically as tables are loaded at run-time. Note:
 548          * .Pointer field is not validated until after call to acpi_tb_verify_table.
 549          */
 550         acpi_gbl_DSDT =
 551             acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer;
 552
 553         /*
 554          * Optionally copy the entire DSDT to local memory (instead of simply
 555          * mapping it.) There are some BIOSs that corrupt or replace the original
 556          * DSDT, creating the need for this option. Default is FALSE, do not copy
 557          * the DSDT.
 558          */
 559         if (acpi_gbl_copy_dsdt_locally) {
 560                 new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT);
 561                 if (new_dsdt) {
 562                         acpi_gbl_DSDT = new_dsdt;
 563                 }
 564         }
 565
 566         /*
 567          * Save the original DSDT header for detection of table corruption
 568          * and/or replacement of the DSDT from outside the OS.
 569          */
 570         ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
 571                     sizeof(struct acpi_table_header));
 572
 573         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 574
 575         /* Load and parse tables */
 576
 577         status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
 578         if (ACPI_FAILURE(status)) {
 579                 return_ACPI_STATUS(status);
 580         }
 581
 582         /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
 583
 584         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 585         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 586                 if ((!ACPI_COMPARE_NAME
 587                      (&(acpi_gbl_root_table_list.tables[i].signature),
 588                       ACPI_SIG_SSDT)
 589                      &&
 590                      !ACPI_COMPARE_NAME(&
 591                                         (acpi_gbl_root_table_list.tables[i].
 592                                          signature), ACPI_SIG_PSDT))
 593                     ||
 594                     ACPI_FAILURE(acpi_tb_verify_table
 595                                  (&acpi_gbl_root_table_list.tables[i]))) {
 596                         continue;
 597                 }
 598
 599                 if (no_auto_ssdt) {
 600                         printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
 601                         continue;
 602                 }
 603
 604                 /* Ignore errors while loading tables, get as many as possible */
 605
 606                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 607                 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
 608                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 609         }
 610
 611         ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
 612
 613       unlock_and_exit:
 614         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 615         return_ACPI_STATUS(status);
 616 }
 617
 618 /*******************************************************************************
 619  *
 620  * FUNCTION:    acpi_load_tables
 621  *
 622  * PARAMETERS:  None
 623  *
 624  * RETURN:      Status
 625  *
 626  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
 627  *
 628  ******************************************************************************/
 629
 630 acpi_status acpi_load_tables(void)
 631 {
 632         acpi_status status;
 633
 634         ACPI_FUNCTION_TRACE(acpi_load_tables);
 635
 636         /* Load the namespace from the tables */
 637
 638         status = acpi_tb_load_namespace();
 639         if (ACPI_FAILURE(status)) {
 640                 ACPI_EXCEPTION((AE_INFO, status,
 641                                 "While loading namespace from ACPI tables"));
 642         }
 643
 644         return_ACPI_STATUS(status);
 645 }
 646
 647 ACPI_EXPORT_SYMBOL(acpi_load_tables)
 648
 649
 650 /*******************************************************************************
 651  *
 652  * FUNCTION:    acpi_install_table_handler
 653  *
 654  * PARAMETERS:  Handler         - Table event handler
 655  *              Context         - Value passed to the handler on each event
 656  *
 657  * RETURN:      Status
 658  *
 659  * DESCRIPTION: Install table event handler
 660  *
 661  ******************************************************************************/
 662 acpi_status
 663 acpi_install_table_handler(acpi_tbl_handler handler, void *context)
 664 {
 665         acpi_status status;
 666
 667         ACPI_FUNCTION_TRACE(acpi_install_table_handler);
 668
 669         if (!handler) {
 670                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 671         }
 672
 673         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 674         if (ACPI_FAILURE(status)) {
 675                 return_ACPI_STATUS(status);
 676         }
 677
 678         /* Don't allow more than one handler */
 679
 680         if (acpi_gbl_table_handler) {
 681                 status = AE_ALREADY_EXISTS;
 682                 goto cleanup;
 683         }
 684
 685         /* Install the handler */
 686
 687         acpi_gbl_table_handler = handler;
 688         acpi_gbl_table_handler_context = context;
 689
 690       cleanup:
 691         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 692         return_ACPI_STATUS(status);
 693 }
 694
 695 ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
 696
 697 /*******************************************************************************
 698  *
 699  * FUNCTION:    acpi_remove_table_handler
 700  *
 701  * PARAMETERS:  Handler         - Table event handler that was installed
 702  *                                previously.
 703  *
 704  * RETURN:      Status
 705  *
 706  * DESCRIPTION: Remove table event handler
 707  *
 708  ******************************************************************************/
 709 acpi_status acpi_remove_table_handler(acpi_tbl_handler handler)
 710 {
 711         acpi_status status;
 712
 713         ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
 714
 715         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 716         if (ACPI_FAILURE(status)) {
 717                 return_ACPI_STATUS(status);
 718         }
 719
 720         /* Make sure that the installed handler is the same */
 721
 722         if (!handler || handler != acpi_gbl_table_handler) {
 723                 status = AE_BAD_PARAMETER;
 724                 goto cleanup;
 725         }
 726
 727         /* Remove the handler */
 728
 729         acpi_gbl_table_handler = NULL;
 730
 731       cleanup:
 732         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 733         return_ACPI_STATUS(status);
 734 }
 735
 736 ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
 737
 738
 739 static int __init acpi_no_auto_ssdt_setup(char *s) {
 740
 741         printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");
 742
 743         no_auto_ssdt = 1;
 744
 745         return 1;
 746 }
 747
 748 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);