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