drivers/acpi/acpica/tbinstal.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbinstal - ACPI table installation and removal
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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(table_desc->pointer->
 145                                                          signature) ?
 146                                  table_desc->pointer->signature : "????",
 147                                  *(u32 *)table_desc->pointer->signature));
 148
 149                 return_ACPI_STATUS(AE_BAD_SIGNATURE);
 150         }
 151
 152         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 153
 154         /* Check if table is already registered */
 155
 156         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 157                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
 158                         status =
 159                             acpi_tb_verify_table(&acpi_gbl_root_table_list.
 160                                                  tables[i]);
 161                         if (ACPI_FAILURE(status)
 162                             || !acpi_gbl_root_table_list.tables[i].pointer) {
 163                                 continue;
 164                         }
 165                 }
 166
 167                 /*
 168                  * Check for a table match on the entire table length,
 169                  * not just the header.
 170                  */
 171                 if (table_desc->length !=
 172                     acpi_gbl_root_table_list.tables[i].length) {
 173                         continue;
 174                 }
 175
 176                 if (ACPI_MEMCMP(table_desc->pointer,
 177                                 acpi_gbl_root_table_list.tables[i].pointer,
 178                                 acpi_gbl_root_table_list.tables[i].length)) {
 179                         continue;
 180                 }
 181
 182                 /*
 183                  * Note: the current mechanism does not unregister a table if it is
 184                  * dynamically unloaded. The related namespace entries are deleted,
 185                  * but the table remains in the root table list.
 186                  *
 187                  * The assumption here is that the number of different tables that
 188                  * will be loaded is actually small, and there is minimal overhead
 189                  * in just keeping the table in case it is needed again.
 190                  *
 191                  * If this assumption changes in the future (perhaps on large
 192                  * machines with many table load/unload operations), tables will
 193                  * need to be unregistered when they are unloaded, and slots in the
 194                  * root table list should be reused when empty.
 195                  */
 196
 197                 /*
 198                  * Table is already registered.
 199                  * We can delete the table that was passed as a parameter.
 200                  */
 201                 acpi_tb_delete_table(table_desc);
 202                 *table_index = i;
 203
 204                 if (acpi_gbl_root_table_list.tables[i].
 205                     flags & ACPI_TABLE_IS_LOADED) {
 206
 207                         /* Table is still loaded, this is an error */
 208
 209                         status = AE_ALREADY_EXISTS;
 210                         goto release;
 211                 } else {
 212                         /* Table was unloaded, allow it to be reloaded */
 213
 214                         table_desc->pointer =
 215                             acpi_gbl_root_table_list.tables[i].pointer;
 216                         table_desc->address =
 217                             acpi_gbl_root_table_list.tables[i].address;
 218                         status = AE_OK;
 219                         goto print_header;
 220                 }
 221         }
 222
 223         /*
 224          * ACPI Table Override:
 225          * Allow the host to override dynamically loaded tables.
 226          * NOTE: the table is fully mapped at this point, and the mapping will
 227          * be deleted by tb_table_override if the table is actually overridden.
 228          */
 229         (void)acpi_tb_table_override(table_desc->pointer, table_desc);
 230
 231         /* Add the table to the global root table list */
 232
 233         status = acpi_tb_store_table(table_desc->address, table_desc->pointer,
 234                                      table_desc->length, table_desc->flags,
 235                                      table_index);
 236         if (ACPI_FAILURE(status)) {
 237                 goto release;
 238         }
 239
 240       print_header:
 241         acpi_tb_print_table_header(table_desc->address, table_desc->pointer);
 242
 243       release:
 244         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 245         return_ACPI_STATUS(status);
 246 }
 247
 248 /*******************************************************************************
 249  *
 250  * FUNCTION:    acpi_tb_table_override
 251  *
 252  * PARAMETERS:  table_header        - Header for the original table
 253  *              table_desc          - Table descriptor initialized for the
 254  *                                    original table. May or may not be mapped.
 255  *
 256  * RETURN:      Pointer to the entire new table. NULL if table not overridden.
 257  *              If overridden, installs the new table within the input table
 258  *              descriptor.
 259  *
 260  * DESCRIPTION: Attempt table override by calling the OSL override functions.
 261  *              Note: If the table is overridden, then the entire new table
 262  *              is mapped and returned by this function.
 263  *
 264  ******************************************************************************/
 265
 266 struct acpi_table_header *acpi_tb_table_override(struct acpi_table_header
 267                                                  *table_header,
 268                                                  struct acpi_table_desc
 269                                                  *table_desc)
 270 {
 271         acpi_status status;
 272         struct acpi_table_header *new_table = NULL;
 273         acpi_physical_address new_address = 0;
 274         u32 new_table_length = 0;
 275         u8 new_flags;
 276         char *override_type;
 277
 278         /* (1) Attempt logical override (returns a logical address) */
 279
 280         status = acpi_os_table_override(table_header, &new_table);
 281         if (ACPI_SUCCESS(status) && new_table) {
 282                 new_address = ACPI_PTR_TO_PHYSADDR(new_table);
 283                 new_table_length = new_table->length;
 284                 new_flags = ACPI_TABLE_ORIGIN_OVERRIDE;
 285                 override_type = "Logical";
 286                 goto finish_override;
 287         }
 288
 289         /* (2) Attempt physical override (returns a physical address) */
 290
 291         status = acpi_os_physical_table_override(table_header,
 292                                                  &new_address,
 293                                                  &new_table_length);
 294         if (ACPI_SUCCESS(status) && new_address && new_table_length) {
 295
 296                 /* Map the entire new table */
 297
 298                 new_table = acpi_os_map_memory(new_address, new_table_length);
 299                 if (!new_table) {
 300                         ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY,
 301                                         "%4.4s %p Attempted physical table override failed",
 302                                         table_header->signature,
 303                                         ACPI_CAST_PTR(void,
 304                                                       table_desc->address)));
 305                         return (NULL);
 306                 }
 307
 308                 override_type = "Physical";
 309                 new_flags = ACPI_TABLE_ORIGIN_MAPPED;
 310                 goto finish_override;
 311         }
 312
 313         return (NULL);          /* There was no override */
 314
 315       finish_override:
 316
 317         ACPI_INFO((AE_INFO,
 318                    "%4.4s %p %s table override, new table: %p",
 319                    table_header->signature,
 320                    ACPI_CAST_PTR(void, table_desc->address),
 321                    override_type, new_table));
 322
 323         /* We can now unmap/delete the original table (if fully mapped) */
 324
 325         acpi_tb_delete_table(table_desc);
 326
 327         /* Setup descriptor for the new table */
 328
 329         table_desc->address = new_address;
 330         table_desc->pointer = new_table;
 331         table_desc->length = new_table_length;
 332         table_desc->flags = new_flags;
 333
 334         return (new_table);
 335 }
 336
 337 /*******************************************************************************
 338  *
 339  * FUNCTION:    acpi_tb_resize_root_table_list
 340  *
 341  * PARAMETERS:  None
 342  *
 343  * RETURN:      Status
 344  *
 345  * DESCRIPTION: Expand the size of global table array
 346  *
 347  ******************************************************************************/
 348
 349 acpi_status acpi_tb_resize_root_table_list(void)
 350 {
 351         struct acpi_table_desc *tables;
 352         u32 table_count;
 353
 354         ACPI_FUNCTION_TRACE(tb_resize_root_table_list);
 355
 356         /* allow_resize flag is a parameter to acpi_initialize_tables */
 357
 358         if (!(acpi_gbl_root_table_list.flags & ACPI_ROOT_ALLOW_RESIZE)) {
 359                 ACPI_ERROR((AE_INFO,
 360                             "Resize of Root Table Array is not allowed"));
 361                 return_ACPI_STATUS(AE_SUPPORT);
 362         }
 363
 364         /* Increase the Table Array size */
 365
 366         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 367                 table_count = acpi_gbl_root_table_list.max_table_count;
 368         } else {
 369                 table_count = acpi_gbl_root_table_list.current_table_count;
 370         }
 371
 372         tables = ACPI_ALLOCATE_ZEROED(((acpi_size) table_count +
 373                                        ACPI_ROOT_TABLE_SIZE_INCREMENT) *
 374                                       sizeof(struct acpi_table_desc));
 375         if (!tables) {
 376                 ACPI_ERROR((AE_INFO,
 377                             "Could not allocate new root table array"));
 378                 return_ACPI_STATUS(AE_NO_MEMORY);
 379         }
 380
 381         /* Copy and free the previous table array */
 382
 383         if (acpi_gbl_root_table_list.tables) {
 384                 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables,
 385                             (acpi_size) table_count *
 386                             sizeof(struct acpi_table_desc));
 387
 388                 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 389                         ACPI_FREE(acpi_gbl_root_table_list.tables);
 390                 }
 391         }
 392
 393         acpi_gbl_root_table_list.tables = tables;
 394         acpi_gbl_root_table_list.max_table_count =
 395             table_count + ACPI_ROOT_TABLE_SIZE_INCREMENT;
 396         acpi_gbl_root_table_list.flags |= ACPI_ROOT_ORIGIN_ALLOCATED;
 397
 398         return_ACPI_STATUS(AE_OK);
 399 }
 400
 401 /*******************************************************************************
 402  *
 403  * FUNCTION:    acpi_tb_store_table
 404  *
 405  * PARAMETERS:  address             - Table address
 406  *              table               - Table header
 407  *              length              - Table length
 408  *              flags               - flags
 409  *
 410  * RETURN:      Status and table index.
 411  *
 412  * DESCRIPTION: Add an ACPI table to the global table list
 413  *
 414  ******************************************************************************/
 415
 416 acpi_status
 417 acpi_tb_store_table(acpi_physical_address address,
 418                     struct acpi_table_header *table,
 419                     u32 length, u8 flags, u32 *table_index)
 420 {
 421         acpi_status status;
 422         struct acpi_table_desc *new_table;
 423
 424         /* Ensure that there is room for the table in the Root Table List */
 425
 426         if (acpi_gbl_root_table_list.current_table_count >=
 427             acpi_gbl_root_table_list.max_table_count) {
 428                 status = acpi_tb_resize_root_table_list();
 429                 if (ACPI_FAILURE(status)) {
 430                         return (status);
 431                 }
 432         }
 433
 434         new_table =
 435             &acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.
 436                                              current_table_count];
 437
 438         /* Initialize added table */
 439
 440         new_table->address = address;
 441         new_table->pointer = table;
 442         new_table->length = length;
 443         new_table->owner_id = 0;
 444         new_table->flags = flags;
 445
 446         ACPI_MOVE_32_TO_32(&new_table->signature, table->signature);
 447
 448         *table_index = acpi_gbl_root_table_list.current_table_count;
 449         acpi_gbl_root_table_list.current_table_count++;
 450         return (AE_OK);
 451 }
 452
 453 /*******************************************************************************
 454  *
 455  * FUNCTION:    acpi_tb_delete_table
 456  *
 457  * PARAMETERS:  table_index         - Table index
 458  *
 459  * RETURN:      None
 460  *
 461  * DESCRIPTION: Delete one internal ACPI table
 462  *
 463  ******************************************************************************/
 464
 465 void acpi_tb_delete_table(struct acpi_table_desc *table_desc)
 466 {
 467         /* Table must be mapped or allocated */
 468         if (!table_desc->pointer) {
 469                 return;
 470         }
 471         switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
 472         case ACPI_TABLE_ORIGIN_MAPPED:
 473
 474                 acpi_os_unmap_memory(table_desc->pointer, table_desc->length);
 475                 break;
 476
 477         case ACPI_TABLE_ORIGIN_ALLOCATED:
 478
 479                 ACPI_FREE(table_desc->pointer);
 480                 break;
 481
 482                 /* Not mapped or allocated, there is nothing we can do */
 483
 484         default:
 485
 486                 return;
 487         }
 488
 489         table_desc->pointer = NULL;
 490 }
 491
 492 /*******************************************************************************
 493  *
 494  * FUNCTION:    acpi_tb_terminate
 495  *
 496  * PARAMETERS:  None
 497  *
 498  * RETURN:      None
 499  *
 500  * DESCRIPTION: Delete all internal ACPI tables
 501  *
 502  ******************************************************************************/
 503
 504 void acpi_tb_terminate(void)
 505 {
 506         u32 i;
 507
 508         ACPI_FUNCTION_TRACE(tb_terminate);
 509
 510         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 511
 512         /* Delete the individual tables */
 513
 514         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 515                 acpi_tb_delete_table(&acpi_gbl_root_table_list.tables[i]);
 516         }
 517
 518         /*
 519          * Delete the root table array if allocated locally. Array cannot be
 520          * mapped, so we don't need to check for that flag.
 521          */
 522         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 523                 ACPI_FREE(acpi_gbl_root_table_list.tables);
 524         }
 525
 526         acpi_gbl_root_table_list.tables = NULL;
 527         acpi_gbl_root_table_list.flags = 0;
 528         acpi_gbl_root_table_list.current_table_count = 0;
 529
 530         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));
 531         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 532
 533         return_VOID;
 534 }
 535
 536 /*******************************************************************************
 537  *
 538  * FUNCTION:    acpi_tb_delete_namespace_by_owner
 539  *
 540  * PARAMETERS:  table_index         - Table index
 541  *
 542  * RETURN:      Status
 543  *
 544  * DESCRIPTION: Delete all namespace objects created when this table was loaded.
 545  *
 546  ******************************************************************************/
 547
 548 acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index)
 549 {
 550         acpi_owner_id owner_id;
 551         acpi_status status;
 552
 553         ACPI_FUNCTION_TRACE(tb_delete_namespace_by_owner);
 554
 555         status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 556         if (ACPI_FAILURE(status)) {
 557                 return_ACPI_STATUS(status);
 558         }
 559
 560         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 561
 562                 /* The table index does not exist */
 563
 564                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 565                 return_ACPI_STATUS(AE_NOT_EXIST);
 566         }
 567
 568         /* Get the owner ID for this table, used to delete namespace nodes */
 569
 570         owner_id = acpi_gbl_root_table_list.tables[table_index].owner_id;
 571         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 572
 573         /*
 574          * Need to acquire the namespace writer lock to prevent interference
 575          * with any concurrent namespace walks. The interpreter must be
 576          * released during the deletion since the acquisition of the deletion
 577          * lock may block, and also since the execution of a namespace walk
 578          * must be allowed to use the interpreter.
 579          */
 580         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 581         status = acpi_ut_acquire_write_lock(&acpi_gbl_namespace_rw_lock);
 582
 583         acpi_ns_delete_namespace_by_owner(owner_id);
 584         if (ACPI_FAILURE(status)) {
 585                 return_ACPI_STATUS(status);
 586         }
 587
 588         acpi_ut_release_write_lock(&acpi_gbl_namespace_rw_lock);
 589
 590         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 591         return_ACPI_STATUS(status);
 592 }
 593
 594 /*******************************************************************************
 595  *
 596  * FUNCTION:    acpi_tb_allocate_owner_id
 597  *
 598  * PARAMETERS:  table_index         - Table index
 599  *
 600  * RETURN:      Status
 601  *
 602  * DESCRIPTION: Allocates owner_id in table_desc
 603  *
 604  ******************************************************************************/
 605
 606 acpi_status acpi_tb_allocate_owner_id(u32 table_index)
 607 {
 608         acpi_status status = AE_BAD_PARAMETER;
 609
 610         ACPI_FUNCTION_TRACE(tb_allocate_owner_id);
 611
 612         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 613         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 614                 status = acpi_ut_allocate_owner_id
 615                     (&(acpi_gbl_root_table_list.tables[table_index].owner_id));
 616         }
 617
 618         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 619         return_ACPI_STATUS(status);
 620 }
 621
 622 /*******************************************************************************
 623  *
 624  * FUNCTION:    acpi_tb_release_owner_id
 625  *
 626  * PARAMETERS:  table_index         - Table index
 627  *
 628  * RETURN:      Status
 629  *
 630  * DESCRIPTION: Releases owner_id in table_desc
 631  *
 632  ******************************************************************************/
 633
 634 acpi_status acpi_tb_release_owner_id(u32 table_index)
 635 {
 636         acpi_status status = AE_BAD_PARAMETER;
 637
 638         ACPI_FUNCTION_TRACE(tb_release_owner_id);
 639
 640         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 641         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 642                 acpi_ut_release_owner_id(&
 643                                          (acpi_gbl_root_table_list.
 644                                           tables[table_index].owner_id));
 645                 status = AE_OK;
 646         }
 647
 648         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 649         return_ACPI_STATUS(status);
 650 }
 651
 652 /*******************************************************************************
 653  *
 654  * FUNCTION:    acpi_tb_get_owner_id
 655  *
 656  * PARAMETERS:  table_index         - Table index
 657  *              owner_id            - Where the table owner_id is returned
 658  *
 659  * RETURN:      Status
 660  *
 661  * DESCRIPTION: returns owner_id for the ACPI table
 662  *
 663  ******************************************************************************/
 664
 665 acpi_status acpi_tb_get_owner_id(u32 table_index, acpi_owner_id *owner_id)
 666 {
 667         acpi_status status = AE_BAD_PARAMETER;
 668
 669         ACPI_FUNCTION_TRACE(tb_get_owner_id);
 670
 671         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 672         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 673                 *owner_id =
 674                     acpi_gbl_root_table_list.tables[table_index].owner_id;
 675                 status = AE_OK;
 676         }
 677
 678         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 679         return_ACPI_STATUS(status);
 680 }
 681
 682 /*******************************************************************************
 683  *
 684  * FUNCTION:    acpi_tb_is_table_loaded
 685  *
 686  * PARAMETERS:  table_index         - Table index
 687  *
 688  * RETURN:      Table Loaded Flag
 689  *
 690  ******************************************************************************/
 691
 692 u8 acpi_tb_is_table_loaded(u32 table_index)
 693 {
 694         u8 is_loaded = FALSE;
 695
 696         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 697         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 698                 is_loaded = (u8)
 699                     (acpi_gbl_root_table_list.tables[table_index].flags &
 700                      ACPI_TABLE_IS_LOADED);
 701         }
 702
 703         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 704         return (is_loaded);
 705 }
 706
 707 /*******************************************************************************
 708  *
 709  * FUNCTION:    acpi_tb_set_table_loaded_flag
 710  *
 711  * PARAMETERS:  table_index         - Table index
 712  *              is_loaded           - TRUE if table is loaded, FALSE otherwise
 713  *
 714  * RETURN:      None
 715  *
 716  * DESCRIPTION: Sets the table loaded flag to either TRUE or FALSE.
 717  *
 718  ******************************************************************************/
 719
 720 void acpi_tb_set_table_loaded_flag(u32 table_index, u8 is_loaded)
 721 {
 722
 723         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 724         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 725                 if (is_loaded) {
 726                         acpi_gbl_root_table_list.tables[table_index].flags |=
 727                             ACPI_TABLE_IS_LOADED;
 728                 } else {
 729                         acpi_gbl_root_table_list.tables[table_index].flags &=
 730                             ~ACPI_TABLE_IS_LOADED;
 731                 }
 732         }
 733
 734         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 735 }