drivers/acpi/acpica/tbinstal.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbinstal - ACPI table installation and removal
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2014, 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         /* Always calculate checksum, ignore bad checksum if requested */
  84
  85         status =
  86             acpi_tb_verify_checksum(table_desc->pointer, table_desc->length);
  87
  88         return_ACPI_STATUS(status);
  89 }
  90
  91 /*******************************************************************************
  92  *
  93  * FUNCTION:    acpi_tb_add_table
  94  *
  95  * PARAMETERS:  table_desc          - Table descriptor
  96  *              table_index         - Where the table index is returned
  97  *
  98  * RETURN:      Status
  99  *
 100  * DESCRIPTION: This function is called to add an ACPI table. It is used to
 101  *              dynamically load tables via the Load and load_table AML
 102  *              operators.
 103  *
 104  ******************************************************************************/
 105
 106 acpi_status
 107 acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
 108 {
 109         u32 i;
 110         acpi_status status = AE_OK;
 111
 112         ACPI_FUNCTION_TRACE(tb_add_table);
 113
 114         if (!table_desc->pointer) {
 115                 status = acpi_tb_verify_table(table_desc);
 116                 if (ACPI_FAILURE(status) || !table_desc->pointer) {
 117                         return_ACPI_STATUS(status);
 118                 }
 119         }
 120
 121         /*
 122          * Validate the incoming table signature.
 123          *
 124          * 1) Originally, we checked the table signature for "SSDT" or "PSDT".
 125          * 2) We added support for OEMx tables, signature "OEM".
 126          * 3) Valid tables were encountered with a null signature, so we just
 127          *    gave up on validating the signature, (05/2008).
 128          * 4) We encountered non-AML tables such as the MADT, which caused
 129          *    interpreter errors and kernel faults. So now, we once again allow
 130          *    only "SSDT", "OEMx", and now, also a null signature. (05/2011).
 131          */
 132         if ((table_desc->pointer->signature[0] != 0x00) &&
 133             (!ACPI_COMPARE_NAME(table_desc->pointer->signature, ACPI_SIG_SSDT))
 134             && (ACPI_STRNCMP(table_desc->pointer->signature, "OEM", 3))) {
 135                 ACPI_BIOS_ERROR((AE_INFO,
 136                                  "Table has invalid signature [%4.4s] (0x%8.8X), "
 137                                  "must be SSDT or OEMx",
 138                                  acpi_ut_valid_acpi_name(table_desc->pointer->
 139                                                          signature) ?
 140                                  table_desc->pointer->signature : "????",
 141                                  *(u32 *)table_desc->pointer->signature));
 142
 143                 return_ACPI_STATUS(AE_BAD_SIGNATURE);
 144         }
 145
 146         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 147
 148         /* Check if table is already registered */
 149
 150         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 151                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
 152                         status =
 153                             acpi_tb_verify_table(&acpi_gbl_root_table_list.
 154                                                  tables[i]);
 155                         if (ACPI_FAILURE(status)
 156                             || !acpi_gbl_root_table_list.tables[i].pointer) {
 157                                 continue;
 158                         }
 159                 }
 160
 161                 /*
 162                  * Check for a table match on the entire table length,
 163                  * not just the header.
 164                  */
 165                 if (table_desc->length !=
 166                     acpi_gbl_root_table_list.tables[i].length) {
 167                         continue;
 168                 }
 169
 170                 if (ACPI_MEMCMP(table_desc->pointer,
 171                                 acpi_gbl_root_table_list.tables[i].pointer,
 172                                 acpi_gbl_root_table_list.tables[i].length)) {
 173                         continue;
 174                 }
 175
 176                 /*
 177                  * Note: the current mechanism does not unregister a table if it is
 178                  * dynamically unloaded. The related namespace entries are deleted,
 179                  * but the table remains in the root table list.
 180                  *
 181                  * The assumption here is that the number of different tables that
 182                  * will be loaded is actually small, and there is minimal overhead
 183                  * in just keeping the table in case it is needed again.
 184                  *
 185                  * If this assumption changes in the future (perhaps on large
 186                  * machines with many table load/unload operations), tables will
 187                  * need to be unregistered when they are unloaded, and slots in the
 188                  * root table list should be reused when empty.
 189                  */
 190
 191                 /*
 192                  * Table is already registered.
 193                  * We can delete the table that was passed as a parameter.
 194                  */
 195                 acpi_tb_delete_table(table_desc);
 196                 *table_index = i;
 197
 198                 if (acpi_gbl_root_table_list.tables[i].
 199                     flags & ACPI_TABLE_IS_LOADED) {
 200
 201                         /* Table is still loaded, this is an error */
 202
 203                         status = AE_ALREADY_EXISTS;
 204                         goto release;
 205                 } else {
 206                         /* Table was unloaded, allow it to be reloaded */
 207
 208                         table_desc->pointer =
 209                             acpi_gbl_root_table_list.tables[i].pointer;
 210                         table_desc->address =
 211                             acpi_gbl_root_table_list.tables[i].address;
 212                         status = AE_OK;
 213                         goto print_header;
 214                 }
 215         }
 216
 217         /*
 218          * ACPI Table Override:
 219          * Allow the host to override dynamically loaded tables.
 220          * NOTE: the table is fully mapped at this point, and the mapping will
 221          * be deleted by tb_table_override if the table is actually overridden.
 222          */
 223         (void)acpi_tb_table_override(table_desc->pointer, table_desc);
 224
 225         /* Add the table to the global root table list */
 226
 227         status = acpi_tb_store_table(table_desc->address, table_desc->pointer,
 228                                      table_desc->length, table_desc->flags,
 229                                      table_index);
 230         if (ACPI_FAILURE(status)) {
 231                 goto release;
 232         }
 233
 234 print_header:
 235         acpi_tb_print_table_header(table_desc->address, table_desc->pointer);
 236
 237 release:
 238         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 239         return_ACPI_STATUS(status);
 240 }
 241
 242 /*******************************************************************************
 243  *
 244  * FUNCTION:    acpi_tb_table_override
 245  *
 246  * PARAMETERS:  table_header        - Header for the original table
 247  *              table_desc          - Table descriptor initialized for the
 248  *                                    original table. May or may not be mapped.
 249  *
 250  * RETURN:      Pointer to the entire new table. NULL if table not overridden.
 251  *              If overridden, installs the new table within the input table
 252  *              descriptor.
 253  *
 254  * DESCRIPTION: Attempt table override by calling the OSL override functions.
 255  *              Note: If the table is overridden, then the entire new table
 256  *              is mapped and returned by this function.
 257  *
 258  ******************************************************************************/
 259
 260 struct acpi_table_header *acpi_tb_table_override(struct acpi_table_header
 261                                                  *table_header,
 262                                                  struct acpi_table_desc
 263                                                  *table_desc)
 264 {
 265         acpi_status status;
 266         struct acpi_table_header *new_table = NULL;
 267         acpi_physical_address new_address = 0;
 268         u32 new_table_length = 0;
 269         u8 new_flags;
 270         char *override_type;
 271
 272         /* (1) Attempt logical override (returns a logical address) */
 273
 274         status = acpi_os_table_override(table_header, &new_table);
 275         if (ACPI_SUCCESS(status) && new_table) {
 276                 new_address = ACPI_PTR_TO_PHYSADDR(new_table);
 277                 new_table_length = new_table->length;
 278                 new_flags = ACPI_TABLE_ORIGIN_OVERRIDE;
 279                 override_type = "Logical";
 280                 goto finish_override;
 281         }
 282
 283         /* (2) Attempt physical override (returns a physical address) */
 284
 285         status = acpi_os_physical_table_override(table_header,
 286                                                  &new_address,
 287                                                  &new_table_length);
 288         if (ACPI_SUCCESS(status) && new_address && new_table_length) {
 289
 290                 /* Map the entire new table */
 291
 292                 new_table = acpi_os_map_memory(new_address, new_table_length);
 293                 if (!new_table) {
 294                         ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY,
 295                                         "%4.4s " ACPI_PRINTF_UINT
 296                                         " Attempted physical table override failed",
 297                                         table_header->signature,
 298                                         ACPI_FORMAT_TO_UINT(table_desc->
 299                                                             address)));
 300                         return (NULL);
 301                 }
 302
 303                 override_type = "Physical";
 304                 new_flags = ACPI_TABLE_ORIGIN_MAPPED;
 305                 goto finish_override;
 306         }
 307
 308         return (NULL);          /* There was no override */
 309
 310 finish_override:
 311
 312         ACPI_INFO((AE_INFO, "%4.4s " ACPI_PRINTF_UINT
 313                    " %s table override, new table: " ACPI_PRINTF_UINT,
 314                    table_header->signature,
 315                    ACPI_FORMAT_TO_UINT(table_desc->address),
 316                    override_type, ACPI_FORMAT_TO_UINT(new_table)));
 317
 318         /* We can now unmap/delete the original table (if fully mapped) */
 319
 320         acpi_tb_delete_table(table_desc);
 321
 322         /* Setup descriptor for the new table */
 323
 324         table_desc->address = new_address;
 325         table_desc->pointer = new_table;
 326         table_desc->length = new_table_length;
 327         table_desc->flags = new_flags;
 328
 329         return (new_table);
 330 }
 331
 332 /*******************************************************************************
 333  *
 334  * FUNCTION:    acpi_tb_resize_root_table_list
 335  *
 336  * PARAMETERS:  None
 337  *
 338  * RETURN:      Status
 339  *
 340  * DESCRIPTION: Expand the size of global table array
 341  *
 342  ******************************************************************************/
 343
 344 acpi_status acpi_tb_resize_root_table_list(void)
 345 {
 346         struct acpi_table_desc *tables;
 347         u32 table_count;
 348
 349         ACPI_FUNCTION_TRACE(tb_resize_root_table_list);
 350
 351         /* allow_resize flag is a parameter to acpi_initialize_tables */
 352
 353         if (!(acpi_gbl_root_table_list.flags & ACPI_ROOT_ALLOW_RESIZE)) {
 354                 ACPI_ERROR((AE_INFO,
 355                             "Resize of Root Table Array is not allowed"));
 356                 return_ACPI_STATUS(AE_SUPPORT);
 357         }
 358
 359         /* Increase the Table Array size */
 360
 361         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 362                 table_count = acpi_gbl_root_table_list.max_table_count;
 363         } else {
 364                 table_count = acpi_gbl_root_table_list.current_table_count;
 365         }
 366
 367         tables = ACPI_ALLOCATE_ZEROED(((acpi_size) table_count +
 368                                        ACPI_ROOT_TABLE_SIZE_INCREMENT) *
 369                                       sizeof(struct acpi_table_desc));
 370         if (!tables) {
 371                 ACPI_ERROR((AE_INFO,
 372                             "Could not allocate new root table array"));
 373                 return_ACPI_STATUS(AE_NO_MEMORY);
 374         }
 375
 376         /* Copy and free the previous table array */
 377
 378         if (acpi_gbl_root_table_list.tables) {
 379                 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables,
 380                             (acpi_size) table_count *
 381                             sizeof(struct acpi_table_desc));
 382
 383                 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 384                         ACPI_FREE(acpi_gbl_root_table_list.tables);
 385                 }
 386         }
 387
 388         acpi_gbl_root_table_list.tables = tables;
 389         acpi_gbl_root_table_list.max_table_count =
 390             table_count + ACPI_ROOT_TABLE_SIZE_INCREMENT;
 391         acpi_gbl_root_table_list.flags |= ACPI_ROOT_ORIGIN_ALLOCATED;
 392
 393         return_ACPI_STATUS(AE_OK);
 394 }
 395
 396 /*******************************************************************************
 397  *
 398  * FUNCTION:    acpi_tb_store_table
 399  *
 400  * PARAMETERS:  address             - Table address
 401  *              table               - Table header
 402  *              length              - Table length
 403  *              flags               - flags
 404  *
 405  * RETURN:      Status and table index.
 406  *
 407  * DESCRIPTION: Add an ACPI table to the global table list
 408  *
 409  ******************************************************************************/
 410
 411 acpi_status
 412 acpi_tb_store_table(acpi_physical_address address,
 413                     struct acpi_table_header *table,
 414                     u32 length, u8 flags, u32 *table_index)
 415 {
 416         acpi_status status;
 417         struct acpi_table_desc *new_table;
 418
 419         /* Ensure that there is room for the table in the Root Table List */
 420
 421         if (acpi_gbl_root_table_list.current_table_count >=
 422             acpi_gbl_root_table_list.max_table_count) {
 423                 status = acpi_tb_resize_root_table_list();
 424                 if (ACPI_FAILURE(status)) {
 425                         return (status);
 426                 }
 427         }
 428
 429         new_table =
 430             &acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.
 431                                              current_table_count];
 432
 433         /* Initialize added table */
 434
 435         new_table->address = address;
 436         new_table->pointer = table;
 437         new_table->length = length;
 438         new_table->owner_id = 0;
 439         new_table->flags = flags;
 440
 441         ACPI_MOVE_32_TO_32(&new_table->signature, table->signature);
 442
 443         *table_index = acpi_gbl_root_table_list.current_table_count;
 444         acpi_gbl_root_table_list.current_table_count++;
 445         return (AE_OK);
 446 }
 447
 448 /*******************************************************************************
 449  *
 450  * FUNCTION:    acpi_tb_delete_table
 451  *
 452  * PARAMETERS:  table_index         - Table index
 453  *
 454  * RETURN:      None
 455  *
 456  * DESCRIPTION: Delete one internal ACPI table
 457  *
 458  ******************************************************************************/
 459
 460 void acpi_tb_delete_table(struct acpi_table_desc *table_desc)
 461 {
 462         /* Table must be mapped or allocated */
 463         if (!table_desc->pointer) {
 464                 return;
 465         }
 466         switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
 467         case ACPI_TABLE_ORIGIN_MAPPED:
 468
 469                 acpi_os_unmap_memory(table_desc->pointer, table_desc->length);
 470                 break;
 471
 472         case ACPI_TABLE_ORIGIN_ALLOCATED:
 473
 474                 ACPI_FREE(table_desc->pointer);
 475                 break;
 476
 477                 /* Not mapped or allocated, there is nothing we can do */
 478
 479         default:
 480
 481                 return;
 482         }
 483
 484         table_desc->pointer = NULL;
 485 }
 486
 487 /*******************************************************************************
 488  *
 489  * FUNCTION:    acpi_tb_terminate
 490  *
 491  * PARAMETERS:  None
 492  *
 493  * RETURN:      None
 494  *
 495  * DESCRIPTION: Delete all internal ACPI tables
 496  *
 497  ******************************************************************************/
 498
 499 void acpi_tb_terminate(void)
 500 {
 501         u32 i;
 502
 503         ACPI_FUNCTION_TRACE(tb_terminate);
 504
 505         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 506
 507         /* Delete the individual tables */
 508
 509         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 510                 acpi_tb_delete_table(&acpi_gbl_root_table_list.tables[i]);
 511         }
 512
 513         /*
 514          * Delete the root table array if allocated locally. Array cannot be
 515          * mapped, so we don't need to check for that flag.
 516          */
 517         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 518                 ACPI_FREE(acpi_gbl_root_table_list.tables);
 519         }
 520
 521         acpi_gbl_root_table_list.tables = NULL;
 522         acpi_gbl_root_table_list.flags = 0;
 523         acpi_gbl_root_table_list.current_table_count = 0;
 524
 525         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));
 526         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 527
 528         return_VOID;
 529 }
 530
 531 /*******************************************************************************
 532  *
 533  * FUNCTION:    acpi_tb_delete_namespace_by_owner
 534  *
 535  * PARAMETERS:  table_index         - Table index
 536  *
 537  * RETURN:      Status
 538  *
 539  * DESCRIPTION: Delete all namespace objects created when this table was loaded.
 540  *
 541  ******************************************************************************/
 542
 543 acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index)
 544 {
 545         acpi_owner_id owner_id;
 546         acpi_status status;
 547
 548         ACPI_FUNCTION_TRACE(tb_delete_namespace_by_owner);
 549
 550         status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 551         if (ACPI_FAILURE(status)) {
 552                 return_ACPI_STATUS(status);
 553         }
 554
 555         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 556
 557                 /* The table index does not exist */
 558
 559                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 560                 return_ACPI_STATUS(AE_NOT_EXIST);
 561         }
 562
 563         /* Get the owner ID for this table, used to delete namespace nodes */
 564
 565         owner_id = acpi_gbl_root_table_list.tables[table_index].owner_id;
 566         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 567
 568         /*
 569          * Need to acquire the namespace writer lock to prevent interference
 570          * with any concurrent namespace walks. The interpreter must be
 571          * released during the deletion since the acquisition of the deletion
 572          * lock may block, and also since the execution of a namespace walk
 573          * must be allowed to use the interpreter.
 574          */
 575         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 576         status = acpi_ut_acquire_write_lock(&acpi_gbl_namespace_rw_lock);
 577
 578         acpi_ns_delete_namespace_by_owner(owner_id);
 579         if (ACPI_FAILURE(status)) {
 580                 return_ACPI_STATUS(status);
 581         }
 582
 583         acpi_ut_release_write_lock(&acpi_gbl_namespace_rw_lock);
 584
 585         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 586         return_ACPI_STATUS(status);
 587 }
 588
 589 /*******************************************************************************
 590  *
 591  * FUNCTION:    acpi_tb_allocate_owner_id
 592  *
 593  * PARAMETERS:  table_index         - Table index
 594  *
 595  * RETURN:      Status
 596  *
 597  * DESCRIPTION: Allocates owner_id in table_desc
 598  *
 599  ******************************************************************************/
 600
 601 acpi_status acpi_tb_allocate_owner_id(u32 table_index)
 602 {
 603         acpi_status status = AE_BAD_PARAMETER;
 604
 605         ACPI_FUNCTION_TRACE(tb_allocate_owner_id);
 606
 607         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 608         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 609                 status = acpi_ut_allocate_owner_id
 610                     (&(acpi_gbl_root_table_list.tables[table_index].owner_id));
 611         }
 612
 613         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 614         return_ACPI_STATUS(status);
 615 }
 616
 617 /*******************************************************************************
 618  *
 619  * FUNCTION:    acpi_tb_release_owner_id
 620  *
 621  * PARAMETERS:  table_index         - Table index
 622  *
 623  * RETURN:      Status
 624  *
 625  * DESCRIPTION: Releases owner_id in table_desc
 626  *
 627  ******************************************************************************/
 628
 629 acpi_status acpi_tb_release_owner_id(u32 table_index)
 630 {
 631         acpi_status status = AE_BAD_PARAMETER;
 632
 633         ACPI_FUNCTION_TRACE(tb_release_owner_id);
 634
 635         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 636         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 637                 acpi_ut_release_owner_id(&
 638                                          (acpi_gbl_root_table_list.
 639                                           tables[table_index].owner_id));
 640                 status = AE_OK;
 641         }
 642
 643         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 644         return_ACPI_STATUS(status);
 645 }
 646
 647 /*******************************************************************************
 648  *
 649  * FUNCTION:    acpi_tb_get_owner_id
 650  *
 651  * PARAMETERS:  table_index         - Table index
 652  *              owner_id            - Where the table owner_id is returned
 653  *
 654  * RETURN:      Status
 655  *
 656  * DESCRIPTION: returns owner_id for the ACPI table
 657  *
 658  ******************************************************************************/
 659
 660 acpi_status acpi_tb_get_owner_id(u32 table_index, acpi_owner_id *owner_id)
 661 {
 662         acpi_status status = AE_BAD_PARAMETER;
 663
 664         ACPI_FUNCTION_TRACE(tb_get_owner_id);
 665
 666         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 667         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 668                 *owner_id =
 669                     acpi_gbl_root_table_list.tables[table_index].owner_id;
 670                 status = AE_OK;
 671         }
 672
 673         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 674         return_ACPI_STATUS(status);
 675 }
 676
 677 /*******************************************************************************
 678  *
 679  * FUNCTION:    acpi_tb_is_table_loaded
 680  *
 681  * PARAMETERS:  table_index         - Table index
 682  *
 683  * RETURN:      Table Loaded Flag
 684  *
 685  ******************************************************************************/
 686
 687 u8 acpi_tb_is_table_loaded(u32 table_index)
 688 {
 689         u8 is_loaded = FALSE;
 690
 691         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 692         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 693                 is_loaded = (u8)
 694                     (acpi_gbl_root_table_list.tables[table_index].flags &
 695                      ACPI_TABLE_IS_LOADED);
 696         }
 697
 698         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 699         return (is_loaded);
 700 }
 701
 702 /*******************************************************************************
 703  *
 704  * FUNCTION:    acpi_tb_set_table_loaded_flag
 705  *
 706  * PARAMETERS:  table_index         - Table index
 707  *              is_loaded           - TRUE if table is loaded, FALSE otherwise
 708  *
 709  * RETURN:      None
 710  *
 711  * DESCRIPTION: Sets the table loaded flag to either TRUE or FALSE.
 712  *
 713  ******************************************************************************/
 714
 715 void acpi_tb_set_table_loaded_flag(u32 table_index, u8 is_loaded)
 716 {
 717
 718         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 719         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 720                 if (is_loaded) {
 721                         acpi_gbl_root_table_list.tables[table_index].flags |=
 722                             ACPI_TABLE_IS_LOADED;
 723                 } else {
 724                         acpi_gbl_root_table_list.tables[table_index].flags &=
 725                             ~ACPI_TABLE_IS_LOADED;
 726                 }
 727         }
 728
 729         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 730 }