drivers/acpi/acpica/tbinstal.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbinstal - ACPI table installation and removal
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2012, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acnamesp.h"
  47 #include "actables.h"
  48
  49 #define _COMPONENT          ACPI_TABLES
  50 ACPI_MODULE_NAME("tbinstal")
  51
  52 /******************************************************************************
  53  *
  54  * FUNCTION:    acpi_tb_verify_table
  55  *
  56  * PARAMETERS:  table_desc          - table
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: this function is called to verify and map table
  61  *
  62  *****************************************************************************/
  63 acpi_status acpi_tb_verify_table(struct acpi_table_desc *table_desc)
  64 {
  65         acpi_status status = AE_OK;
  66
  67         ACPI_FUNCTION_TRACE(tb_verify_table);
  68
  69         /* Map the table if necessary */
  70
  71         if (!table_desc->pointer) {
  72                 if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
  73                     ACPI_TABLE_ORIGIN_MAPPED) {
  74                         table_desc->pointer =
  75                             acpi_os_map_memory(table_desc->address,
  76                                                table_desc->length);
  77                 }
  78                 if (!table_desc->pointer) {
  79                         return_ACPI_STATUS(AE_NO_MEMORY);
  80                 }
  81         }
  82
  83         /* FACS is the odd table, has no standard ACPI header and no checksum */
  84
  85         if (!ACPI_COMPARE_NAME(&table_desc->signature, ACPI_SIG_FACS)) {
  86
  87                 /* Always calculate checksum, ignore bad checksum if requested */
  88
  89                 status =
  90                     acpi_tb_verify_checksum(table_desc->pointer,
  91                                             table_desc->length);
  92         }
  93
  94         return_ACPI_STATUS(status);
  95 }
  96
  97 /*******************************************************************************
  98  *
  99  * FUNCTION:    acpi_tb_add_table
 100  *
 101  * PARAMETERS:  table_desc          - Table descriptor
 102  *              table_index         - Where the table index is returned
 103  *
 104  * RETURN:      Status
 105  *
 106  * DESCRIPTION: This function is called to add an ACPI table. It is used to
 107  *              dynamically load tables via the Load and load_table AML
 108  *              operators.
 109  *
 110  ******************************************************************************/
 111
 112 acpi_status
 113 acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
 114 {
 115         u32 i;
 116         acpi_status status = AE_OK;
 117
 118         ACPI_FUNCTION_TRACE(tb_add_table);
 119
 120         if (!table_desc->pointer) {
 121                 status = acpi_tb_verify_table(table_desc);
 122                 if (ACPI_FAILURE(status) || !table_desc->pointer) {
 123                         return_ACPI_STATUS(status);
 124                 }
 125         }
 126
 127         /*
 128          * Validate the incoming table signature.
 129          *
 130          * 1) Originally, we checked the table signature for "SSDT" or "PSDT".
 131          * 2) We added support for OEMx tables, signature "OEM".
 132          * 3) Valid tables were encountered with a null signature, so we just
 133          *    gave up on validating the signature, (05/2008).
 134          * 4) We encountered non-AML tables such as the MADT, which caused
 135          *    interpreter errors and kernel faults. So now, we once again allow
 136          *    only "SSDT", "OEMx", and now, also a null signature. (05/2011).
 137          */
 138         if ((table_desc->pointer->signature[0] != 0x00) &&
 139             (!ACPI_COMPARE_NAME(table_desc->pointer->signature, ACPI_SIG_SSDT))
 140             && (ACPI_STRNCMP(table_desc->pointer->signature, "OEM", 3))) {
 141                 ACPI_BIOS_ERROR((AE_INFO,
 142                                  "Table has invalid signature [%4.4s] (0x%8.8X), "
 143                                  "must be SSDT or OEMx",
 144                                  acpi_ut_valid_acpi_name(*(u32 *)table_desc->
 145                                                          pointer->
 146                                                          signature) ?
 147                                  table_desc->pointer->signature : "????",
 148                                  *(u32 *)table_desc->pointer->signature));
 149
 150                 return_ACPI_STATUS(AE_BAD_SIGNATURE);
 151         }
 152
 153         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 154
 155         /* Check if table is already registered */
 156
 157         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 158                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
 159                         status =
 160                             acpi_tb_verify_table(&acpi_gbl_root_table_list.
 161                                                  tables[i]);
 162                         if (ACPI_FAILURE(status)
 163                             || !acpi_gbl_root_table_list.tables[i].pointer) {
 164                                 continue;
 165                         }
 166                 }
 167
 168                 /*
 169                  * Check for a table match on the entire table length,
 170                  * not just the header.
 171                  */
 172                 if (table_desc->length !=
 173                     acpi_gbl_root_table_list.tables[i].length) {
 174                         continue;
 175                 }
 176
 177                 if (ACPI_MEMCMP(table_desc->pointer,
 178                                 acpi_gbl_root_table_list.tables[i].pointer,
 179                                 acpi_gbl_root_table_list.tables[i].length)) {
 180                         continue;
 181                 }
 182
 183                 /*
 184                  * Note: the current mechanism does not unregister a table if it is
 185                  * dynamically unloaded. The related namespace entries are deleted,
 186                  * but the table remains in the root table list.
 187                  *
 188                  * The assumption here is that the number of different tables that
 189                  * will be loaded is actually small, and there is minimal overhead
 190                  * in just keeping the table in case it is needed again.
 191                  *
 192                  * If this assumption changes in the future (perhaps on large
 193                  * machines with many table load/unload operations), tables will
 194                  * need to be unregistered when they are unloaded, and slots in the
 195                  * root table list should be reused when empty.
 196                  */
 197
 198                 /*
 199                  * Table is already registered.
 200                  * We can delete the table that was passed as a parameter.
 201                  */
 202                 acpi_tb_delete_table(table_desc);
 203                 *table_index = i;
 204
 205                 if (acpi_gbl_root_table_list.tables[i].
 206                     flags & ACPI_TABLE_IS_LOADED) {
 207
 208                         /* Table is still loaded, this is an error */
 209
 210                         status = AE_ALREADY_EXISTS;
 211                         goto release;
 212                 } else {
 213                         /* Table was unloaded, allow it to be reloaded */
 214
 215                         table_desc->pointer =
 216                             acpi_gbl_root_table_list.tables[i].pointer;
 217                         table_desc->address =
 218                             acpi_gbl_root_table_list.tables[i].address;
 219                         status = AE_OK;
 220                         goto print_header;
 221                 }
 222         }
 223
 224         /*
 225          * ACPI Table Override:
 226          * Allow the host to override dynamically loaded tables.
 227          * NOTE: the table is fully mapped at this point, and the mapping will
 228          * be deleted by tb_table_override if the table is actually overridden.
 229          */
 230         (void)acpi_tb_table_override(table_desc->pointer, table_desc);
 231
 232         /* Add the table to the global root table list */
 233
 234         status = acpi_tb_store_table(table_desc->address, table_desc->pointer,
 235                                      table_desc->length, table_desc->flags,
 236                                      table_index);
 237         if (ACPI_FAILURE(status)) {
 238                 goto release;
 239         }
 240
 241       print_header:
 242         acpi_tb_print_table_header(table_desc->address, table_desc->pointer);
 243
 244       release:
 245         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 246         return_ACPI_STATUS(status);
 247 }
 248
 249 /*******************************************************************************
 250  *
 251  * FUNCTION:    acpi_tb_table_override
 252  *
 253  * PARAMETERS:  table_header        - Header for the original table
 254  *              table_desc          - Table descriptor initialized for the
 255  *                                    original table. May or may not be mapped.
 256  *
 257  * RETURN:      Pointer to the entire new table. NULL if table not overridden.
 258  *              If overridden, installs the new table within the input table
 259  *              descriptor.
 260  *
 261  * DESCRIPTION: Attempt table override by calling the OSL override functions.
 262  *              Note: If the table is overridden, then the entire new table
 263  *              is mapped and returned by this function.
 264  *
 265  ******************************************************************************/
 266
 267 struct acpi_table_header *acpi_tb_table_override(struct acpi_table_header
 268                                                  *table_header,
 269                                                  struct acpi_table_desc
 270                                                  *table_desc)
 271 {
 272         acpi_status status;
 273         struct acpi_table_header *new_table = NULL;
 274         acpi_physical_address new_address = 0;
 275         u32 new_table_length = 0;
 276         u8 new_flags;
 277         char *override_type;
 278
 279         /* (1) Attempt logical override (returns a logical address) */
 280
 281         status = acpi_os_table_override(table_header, &new_table);
 282         if (ACPI_SUCCESS(status) && new_table) {
 283                 new_address = ACPI_PTR_TO_PHYSADDR(new_table);
 284                 new_table_length = new_table->length;
 285                 new_flags = ACPI_TABLE_ORIGIN_OVERRIDE;
 286                 override_type = "Logical";
 287                 goto finish_override;
 288         }
 289
 290         /* (2) Attempt physical override (returns a physical address) */
 291
 292         status = acpi_os_physical_table_override(table_header,
 293                                                  &new_address,
 294                                                  &new_table_length);
 295         if (ACPI_SUCCESS(status) && new_address && new_table_length) {
 296
 297                 /* Map the entire new table */
 298
 299                 new_table = acpi_os_map_memory(new_address, new_table_length);
 300                 if (!new_table) {
 301                         ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY,
 302                                         "%4.4s %p Attempted physical table override failed",
 303                                         table_header->signature,
 304                                         ACPI_CAST_PTR(void,
 305                                                       table_desc->address)));
 306                         return (NULL);
 307                 }
 308
 309                 override_type = "Physical";
 310                 new_flags = ACPI_TABLE_ORIGIN_MAPPED;
 311                 goto finish_override;
 312         }
 313
 314         return (NULL);          /* There was no override */
 315
 316       finish_override:
 317
 318         ACPI_INFO((AE_INFO,
 319                    "%4.4s %p %s table override, new table: %p",
 320                    table_header->signature,
 321                    ACPI_CAST_PTR(void, table_desc->address),
 322                    override_type, new_table));
 323
 324         /* We can now unmap/delete the original table (if fully mapped) */
 325
 326         acpi_tb_delete_table(table_desc);
 327
 328         /* Setup descriptor for the new table */
 329
 330         table_desc->address = new_address;
 331         table_desc->pointer = new_table;
 332         table_desc->length = new_table_length;
 333         table_desc->flags = new_flags;
 334
 335         return (new_table);
 336 }
 337
 338 /*******************************************************************************
 339  *
 340  * FUNCTION:    acpi_tb_resize_root_table_list
 341  *
 342  * PARAMETERS:  None
 343  *
 344  * RETURN:      Status
 345  *
 346  * DESCRIPTION: Expand the size of global table array
 347  *
 348  ******************************************************************************/
 349
 350 acpi_status acpi_tb_resize_root_table_list(void)
 351 {
 352         struct acpi_table_desc *tables;
 353         u32 table_count;
 354
 355         ACPI_FUNCTION_TRACE(tb_resize_root_table_list);
 356
 357         /* allow_resize flag is a parameter to acpi_initialize_tables */
 358
 359         if (!(acpi_gbl_root_table_list.flags & ACPI_ROOT_ALLOW_RESIZE)) {
 360                 ACPI_ERROR((AE_INFO,
 361                             "Resize of Root Table Array is not allowed"));
 362                 return_ACPI_STATUS(AE_SUPPORT);
 363         }
 364
 365         /* Increase the Table Array size */
 366
 367         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 368                 table_count = acpi_gbl_root_table_list.max_table_count;
 369         } else {
 370                 table_count = acpi_gbl_root_table_list.current_table_count;
 371         }
 372
 373         tables = ACPI_ALLOCATE_ZEROED(((acpi_size) table_count +
 374                                        ACPI_ROOT_TABLE_SIZE_INCREMENT) *
 375                                       sizeof(struct acpi_table_desc));
 376         if (!tables) {
 377                 ACPI_ERROR((AE_INFO,
 378                             "Could not allocate new root table array"));
 379                 return_ACPI_STATUS(AE_NO_MEMORY);
 380         }
 381
 382         /* Copy and free the previous table array */
 383
 384         if (acpi_gbl_root_table_list.tables) {
 385                 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables,
 386                             (acpi_size) table_count *
 387                             sizeof(struct acpi_table_desc));
 388
 389                 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 390                         ACPI_FREE(acpi_gbl_root_table_list.tables);
 391                 }
 392         }
 393
 394         acpi_gbl_root_table_list.tables = tables;
 395         acpi_gbl_root_table_list.max_table_count =
 396             table_count + ACPI_ROOT_TABLE_SIZE_INCREMENT;
 397         acpi_gbl_root_table_list.flags |= ACPI_ROOT_ORIGIN_ALLOCATED;
 398
 399         return_ACPI_STATUS(AE_OK);
 400 }
 401
 402 /*******************************************************************************
 403  *
 404  * FUNCTION:    acpi_tb_store_table
 405  *
 406  * PARAMETERS:  address             - Table address
 407  *              table               - Table header
 408  *              length              - Table length
 409  *              flags               - flags
 410  *
 411  * RETURN:      Status and table index.
 412  *
 413  * DESCRIPTION: Add an ACPI table to the global table list
 414  *
 415  ******************************************************************************/
 416
 417 acpi_status
 418 acpi_tb_store_table(acpi_physical_address address,
 419                     struct acpi_table_header *table,
 420                     u32 length, u8 flags, u32 *table_index)
 421 {
 422         acpi_status status;
 423         struct acpi_table_desc *new_table;
 424
 425         /* Ensure that there is room for the table in the Root Table List */
 426
 427         if (acpi_gbl_root_table_list.current_table_count >=
 428             acpi_gbl_root_table_list.max_table_count) {
 429                 status = acpi_tb_resize_root_table_list();
 430                 if (ACPI_FAILURE(status)) {
 431                         return (status);
 432                 }
 433         }
 434
 435         new_table =
 436             &acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.
 437                                              current_table_count];
 438
 439         /* Initialize added table */
 440
 441         new_table->address = address;
 442         new_table->pointer = table;
 443         new_table->length = length;
 444         new_table->owner_id = 0;
 445         new_table->flags = flags;
 446
 447         ACPI_MOVE_32_TO_32(&new_table->signature, table->signature);
 448
 449         *table_index = acpi_gbl_root_table_list.current_table_count;
 450         acpi_gbl_root_table_list.current_table_count++;
 451         return (AE_OK);
 452 }
 453
 454 /*******************************************************************************
 455  *
 456  * FUNCTION:    acpi_tb_delete_table
 457  *
 458  * PARAMETERS:  table_index         - Table index
 459  *
 460  * RETURN:      None
 461  *
 462  * DESCRIPTION: Delete one internal ACPI table
 463  *
 464  ******************************************************************************/
 465
 466 void acpi_tb_delete_table(struct acpi_table_desc *table_desc)
 467 {
 468         /* Table must be mapped or allocated */
 469         if (!table_desc->pointer) {
 470                 return;
 471         }
 472         switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
 473         case ACPI_TABLE_ORIGIN_MAPPED:
 474                 acpi_os_unmap_memory(table_desc->pointer, table_desc->length);
 475                 break;
 476         case ACPI_TABLE_ORIGIN_ALLOCATED:
 477                 ACPI_FREE(table_desc->pointer);
 478                 break;
 479
 480                 /* Not mapped or allocated, there is nothing we can do */
 481
 482         default:
 483                 return;
 484         }
 485
 486         table_desc->pointer = NULL;
 487 }
 488
 489 /*******************************************************************************
 490  *
 491  * FUNCTION:    acpi_tb_terminate
 492  *
 493  * PARAMETERS:  None
 494  *
 495  * RETURN:      None
 496  *
 497  * DESCRIPTION: Delete all internal ACPI tables
 498  *
 499  ******************************************************************************/
 500
 501 void acpi_tb_terminate(void)
 502 {
 503         u32 i;
 504
 505         ACPI_FUNCTION_TRACE(tb_terminate);
 506
 507         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 508
 509         /* Delete the individual tables */
 510
 511         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 512                 acpi_tb_delete_table(&acpi_gbl_root_table_list.tables[i]);
 513         }
 514
 515         /*
 516          * Delete the root table array if allocated locally. Array cannot be
 517          * mapped, so we don't need to check for that flag.
 518          */
 519         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 520                 ACPI_FREE(acpi_gbl_root_table_list.tables);
 521         }
 522
 523         acpi_gbl_root_table_list.tables = NULL;
 524         acpi_gbl_root_table_list.flags = 0;
 525         acpi_gbl_root_table_list.current_table_count = 0;
 526
 527         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));
 528         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 529
 530         return_VOID;
 531 }
 532
 533 /*******************************************************************************
 534  *
 535  * FUNCTION:    acpi_tb_delete_namespace_by_owner
 536  *
 537  * PARAMETERS:  table_index         - Table index
 538  *
 539  * RETURN:      Status
 540  *
 541  * DESCRIPTION: Delete all namespace objects created when this table was loaded.
 542  *
 543  ******************************************************************************/
 544
 545 acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index)
 546 {
 547         acpi_owner_id owner_id;
 548         acpi_status status;
 549
 550         ACPI_FUNCTION_TRACE(tb_delete_namespace_by_owner);
 551
 552         status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 553         if (ACPI_FAILURE(status)) {
 554                 return_ACPI_STATUS(status);
 555         }
 556
 557         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 558
 559                 /* The table index does not exist */
 560
 561                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 562                 return_ACPI_STATUS(AE_NOT_EXIST);
 563         }
 564
 565         /* Get the owner ID for this table, used to delete namespace nodes */
 566
 567         owner_id = acpi_gbl_root_table_list.tables[table_index].owner_id;
 568         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 569
 570         /*
 571          * Need to acquire the namespace writer lock to prevent interference
 572          * with any concurrent namespace walks. The interpreter must be
 573          * released during the deletion since the acquisition of the deletion
 574          * lock may block, and also since the execution of a namespace walk
 575          * must be allowed to use the interpreter.
 576          */
 577         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 578         status = acpi_ut_acquire_write_lock(&acpi_gbl_namespace_rw_lock);
 579
 580         acpi_ns_delete_namespace_by_owner(owner_id);
 581         if (ACPI_FAILURE(status)) {
 582                 return_ACPI_STATUS(status);
 583         }
 584
 585         acpi_ut_release_write_lock(&acpi_gbl_namespace_rw_lock);
 586
 587         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 588         return_ACPI_STATUS(status);
 589 }
 590
 591 /*******************************************************************************
 592  *
 593  * FUNCTION:    acpi_tb_allocate_owner_id
 594  *
 595  * PARAMETERS:  table_index         - Table index
 596  *
 597  * RETURN:      Status
 598  *
 599  * DESCRIPTION: Allocates owner_id in table_desc
 600  *
 601  ******************************************************************************/
 602
 603 acpi_status acpi_tb_allocate_owner_id(u32 table_index)
 604 {
 605         acpi_status status = AE_BAD_PARAMETER;
 606
 607         ACPI_FUNCTION_TRACE(tb_allocate_owner_id);
 608
 609         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 610         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 611                 status = acpi_ut_allocate_owner_id
 612                     (&(acpi_gbl_root_table_list.tables[table_index].owner_id));
 613         }
 614
 615         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 616         return_ACPI_STATUS(status);
 617 }
 618
 619 /*******************************************************************************
 620  *
 621  * FUNCTION:    acpi_tb_release_owner_id
 622  *
 623  * PARAMETERS:  table_index         - Table index
 624  *
 625  * RETURN:      Status
 626  *
 627  * DESCRIPTION: Releases owner_id in table_desc
 628  *
 629  ******************************************************************************/
 630
 631 acpi_status acpi_tb_release_owner_id(u32 table_index)
 632 {
 633         acpi_status status = AE_BAD_PARAMETER;
 634
 635         ACPI_FUNCTION_TRACE(tb_release_owner_id);
 636
 637         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 638         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 639                 acpi_ut_release_owner_id(&
 640                                          (acpi_gbl_root_table_list.
 641                                           tables[table_index].owner_id));
 642                 status = AE_OK;
 643         }
 644
 645         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 646         return_ACPI_STATUS(status);
 647 }
 648
 649 /*******************************************************************************
 650  *
 651  * FUNCTION:    acpi_tb_get_owner_id
 652  *
 653  * PARAMETERS:  table_index         - Table index
 654  *              owner_id            - Where the table owner_id is returned
 655  *
 656  * RETURN:      Status
 657  *
 658  * DESCRIPTION: returns owner_id for the ACPI table
 659  *
 660  ******************************************************************************/
 661
 662 acpi_status acpi_tb_get_owner_id(u32 table_index, acpi_owner_id *owner_id)
 663 {
 664         acpi_status status = AE_BAD_PARAMETER;
 665
 666         ACPI_FUNCTION_TRACE(tb_get_owner_id);
 667
 668         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 669         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 670                 *owner_id =
 671                     acpi_gbl_root_table_list.tables[table_index].owner_id;
 672                 status = AE_OK;
 673         }
 674
 675         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 676         return_ACPI_STATUS(status);
 677 }
 678
 679 /*******************************************************************************
 680  *
 681  * FUNCTION:    acpi_tb_is_table_loaded
 682  *
 683  * PARAMETERS:  table_index         - Table index
 684  *
 685  * RETURN:      Table Loaded Flag
 686  *
 687  ******************************************************************************/
 688
 689 u8 acpi_tb_is_table_loaded(u32 table_index)
 690 {
 691         u8 is_loaded = FALSE;
 692
 693         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 694         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 695                 is_loaded = (u8)
 696                     (acpi_gbl_root_table_list.tables[table_index].flags &
 697                      ACPI_TABLE_IS_LOADED);
 698         }
 699
 700         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 701         return (is_loaded);
 702 }
 703
 704 /*******************************************************************************
 705  *
 706  * FUNCTION:    acpi_tb_set_table_loaded_flag
 707  *
 708  * PARAMETERS:  table_index         - Table index
 709  *              is_loaded           - TRUE if table is loaded, FALSE otherwise
 710  *
 711  * RETURN:      None
 712  *
 713  * DESCRIPTION: Sets the table loaded flag to either TRUE or FALSE.
 714  *
 715  ******************************************************************************/
 716
 717 void acpi_tb_set_table_loaded_flag(u32 table_index, u8 is_loaded)
 718 {
 719
 720         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 721         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 722                 if (is_loaded) {
 723                         acpi_gbl_root_table_list.tables[table_index].flags |=
 724                             ACPI_TABLE_IS_LOADED;
 725                 } else {
 726                         acpi_gbl_root_table_list.tables[table_index].flags &=
 727                             ~ACPI_TABLE_IS_LOADED;
 728                 }
 729         }
 730
 731         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 732 }