drivers/acpi/acpica/tbdata.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbdata - Table manager data structure functions
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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("tbdata")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_tb_init_table_descriptor
  55  *
  56  * PARAMETERS:  table_desc              - Table descriptor
  57  *              address                 - Physical address of the table
  58  *              flags                   - Allocation flags of the table
  59  *              table                   - Pointer to the table
  60  *
  61  * RETURN:      None
  62  *
  63  * DESCRIPTION: Initialize a new table descriptor
  64  *
  65  ******************************************************************************/
  66 void
  67 acpi_tb_init_table_descriptor(struct acpi_table_desc *table_desc,
  68                               acpi_physical_address address,
  69                               u8 flags, struct acpi_table_header *table)
  70 {
  71
  72         /*
  73          * Initialize the table descriptor. Set the pointer to NULL, since the
  74          * table is not fully mapped at this time.
  75          */
  76         ACPI_MEMSET(table_desc, 0, sizeof(struct acpi_table_desc));
  77         table_desc->address = address;
  78         table_desc->length = table->length;
  79         table_desc->flags = flags;
  80         ACPI_MOVE_32_TO_32(table_desc->signature.ascii, table->signature);
  81 }
  82
  83 /*******************************************************************************
  84  *
  85  * FUNCTION:    acpi_tb_acquire_table
  86  *
  87  * PARAMETERS:  table_desc          - Table descriptor
  88  *              table_ptr           - Where table is returned
  89  *              table_length        - Where table length is returned
  90  *              table_flags         - Where table allocation flags are returned
  91  *
  92  * RETURN:      Status
  93  *
  94  * DESCRIPTION: Acquire an ACPI table. It can be used for tables not
  95  *              maintained in the acpi_gbl_root_table_list.
  96  *
  97  ******************************************************************************/
  98
  99 acpi_status
 100 acpi_tb_acquire_table(struct acpi_table_desc *table_desc,
 101                       struct acpi_table_header **table_ptr,
 102                       u32 *table_length, u8 *table_flags)
 103 {
 104         struct acpi_table_header *table = NULL;
 105
 106         switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
 107         case ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL:
 108
 109                 table =
 110                     acpi_os_map_memory(table_desc->address, table_desc->length);
 111                 break;
 112
 113         case ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL:
 114         case ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL:
 115
 116                 table =
 117                     ACPI_CAST_PTR(struct acpi_table_header,
 118                                   table_desc->address);
 119                 break;
 120
 121         default:
 122
 123                 break;
 124         }
 125
 126         /* Table is not valid yet */
 127
 128         if (!table) {
 129                 return (AE_NO_MEMORY);
 130         }
 131
 132         /* Fill the return values */
 133
 134         *table_ptr = table;
 135         *table_length = table_desc->length;
 136         *table_flags = table_desc->flags;
 137         return (AE_OK);
 138 }
 139
 140 /*******************************************************************************
 141  *
 142  * FUNCTION:    acpi_tb_release_table
 143  *
 144  * PARAMETERS:  table               - Pointer for the table
 145  *              table_length        - Length for the table
 146  *              table_flags         - Allocation flags for the table
 147  *
 148  * RETURN:      None
 149  *
 150  * DESCRIPTION: Release a table. The inverse of acpi_tb_acquire_table().
 151  *
 152  ******************************************************************************/
 153
 154 void
 155 acpi_tb_release_table(struct acpi_table_header *table,
 156                       u32 table_length, u8 table_flags)
 157 {
 158
 159         switch (table_flags & ACPI_TABLE_ORIGIN_MASK) {
 160         case ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL:
 161
 162                 acpi_os_unmap_memory(table, table_length);
 163                 break;
 164
 165         case ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL:
 166         case ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL:
 167         default:
 168
 169                 break;
 170         }
 171 }
 172
 173 /*******************************************************************************
 174  *
 175  * FUNCTION:    acpi_tb_acquire_temp_table
 176  *
 177  * PARAMETERS:  table_desc          - Table descriptor to be acquired
 178  *              address             - Address of the table
 179  *              flags               - Allocation flags of the table
 180  *
 181  * RETURN:      Status
 182  *
 183  * DESCRIPTION: This function validates the table header to obtain the length
 184  *              of a table and fills the table descriptor to make its state as
 185  *              "INSTALLED". Such a table descriptor is only used for verified
 186  *              installation.
 187  *
 188  ******************************************************************************/
 189
 190 acpi_status
 191 acpi_tb_acquire_temp_table(struct acpi_table_desc *table_desc,
 192                            acpi_physical_address address, u8 flags)
 193 {
 194         struct acpi_table_header *table_header;
 195
 196         switch (flags & ACPI_TABLE_ORIGIN_MASK) {
 197         case ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL:
 198
 199                 /* Get the length of the full table from the header */
 200
 201                 table_header =
 202                     acpi_os_map_memory(address,
 203                                        sizeof(struct acpi_table_header));
 204                 if (!table_header) {
 205                         return (AE_NO_MEMORY);
 206                 }
 207
 208                 acpi_tb_init_table_descriptor(table_desc, address, flags,
 209                                               table_header);
 210                 acpi_os_unmap_memory(table_header,
 211                                      sizeof(struct acpi_table_header));
 212                 return (AE_OK);
 213
 214         case ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL:
 215         case ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL:
 216
 217                 table_header = ACPI_CAST_PTR(struct acpi_table_header, address);
 218                 if (!table_header) {
 219                         return (AE_NO_MEMORY);
 220                 }
 221
 222                 acpi_tb_init_table_descriptor(table_desc, address, flags,
 223                                               table_header);
 224                 return (AE_OK);
 225
 226         default:
 227
 228                 break;
 229         }
 230
 231         /* Table is not valid yet */
 232
 233         return (AE_NO_MEMORY);
 234 }
 235
 236 /*******************************************************************************
 237  *
 238  * FUNCTION:    acpi_tb_release_temp_table
 239  *
 240  * PARAMETERS:  table_desc          - Table descriptor to be released
 241  *
 242  * RETURN:      Status
 243  *
 244  * DESCRIPTION: The inverse of acpi_tb_acquire_temp_table().
 245  *
 246  *****************************************************************************/
 247
 248 void acpi_tb_release_temp_table(struct acpi_table_desc *table_desc)
 249 {
 250
 251         /*
 252          * Note that the .Address is maintained by the callers of
 253          * acpi_tb_acquire_temp_table(), thus do not invoke acpi_tb_uninstall_table()
 254          * where .Address will be freed.
 255          */
 256         acpi_tb_invalidate_table(table_desc);
 257 }
 258
 259 /******************************************************************************
 260  *
 261  * FUNCTION:    acpi_tb_validate_table
 262  *
 263  * PARAMETERS:  table_desc          - Table descriptor
 264  *
 265  * RETURN:      Status
 266  *
 267  * DESCRIPTION: This function is called to validate the table, the returned
 268  *              table descriptor is in "VALIDATED" state.
 269  *
 270  *****************************************************************************/
 271
 272 acpi_status acpi_tb_validate_table(struct acpi_table_desc *table_desc)
 273 {
 274         acpi_status status = AE_OK;
 275
 276         ACPI_FUNCTION_TRACE(tb_validate_table);
 277
 278         /* Validate the table if necessary */
 279
 280         if (!table_desc->pointer) {
 281                 status = acpi_tb_acquire_table(table_desc, &table_desc->pointer,
 282                                                &table_desc->length,
 283                                                &table_desc->flags);
 284                 if (!table_desc->pointer) {
 285                         status = AE_NO_MEMORY;
 286                 }
 287         }
 288
 289         return_ACPI_STATUS(status);
 290 }
 291
 292 /*******************************************************************************
 293  *
 294  * FUNCTION:    acpi_tb_invalidate_table
 295  *
 296  * PARAMETERS:  table_desc          - Table descriptor
 297  *
 298  * RETURN:      None
 299  *
 300  * DESCRIPTION: Invalidate one internal ACPI table, this is the inverse of
 301  *              acpi_tb_validate_table().
 302  *
 303  ******************************************************************************/
 304
 305 void acpi_tb_invalidate_table(struct acpi_table_desc *table_desc)
 306 {
 307
 308         ACPI_FUNCTION_TRACE(tb_invalidate_table);
 309
 310         /* Table must be validated */
 311
 312         if (!table_desc->pointer) {
 313                 return_VOID;
 314         }
 315
 316         acpi_tb_release_table(table_desc->pointer, table_desc->length,
 317                               table_desc->flags);
 318         table_desc->pointer = NULL;
 319
 320         return_VOID;
 321 }
 322
 323 /******************************************************************************
 324  *
 325  * FUNCTION:    acpi_tb_validate_temp_table
 326  *
 327  * PARAMETERS:  table_desc          - Table descriptor
 328  *
 329  * RETURN:      Status
 330  *
 331  * DESCRIPTION: This function is called to validate the table, the returned
 332  *              table descriptor is in "VALIDATED" state.
 333  *
 334  *****************************************************************************/
 335
 336 acpi_status acpi_tb_validate_temp_table(struct acpi_table_desc *table_desc)
 337 {
 338
 339         if (!table_desc->pointer && !acpi_gbl_verify_table_checksum) {
 340                 /*
 341                  * Only validates the header of the table.
 342                  * Note that Length contains the size of the mapping after invoking
 343                  * this work around, this value is required by
 344                  * acpi_tb_release_temp_table().
 345                  * We can do this because in acpi_init_table_descriptor(), the Length
 346                  * field of the installed descriptor is filled with the actual
 347                  * table length obtaining from the table header.
 348                  */
 349                 table_desc->length = sizeof(struct acpi_table_header);
 350         }
 351
 352         return (acpi_tb_validate_table(table_desc));
 353 }
 354
 355 /******************************************************************************
 356  *
 357  * FUNCTION:    acpi_tb_verify_temp_table
 358  *
 359  * PARAMETERS:  table_desc          - Table descriptor
 360  *              signature           - Table signature to verify
 361  *
 362  * RETURN:      Status
 363  *
 364  * DESCRIPTION: This function is called to validate and verify the table, the
 365  *              returned table descriptor is in "VALIDATED" state.
 366  *
 367  *****************************************************************************/
 368
 369 acpi_status
 370 acpi_tb_verify_temp_table(struct acpi_table_desc * table_desc, char *signature)
 371 {
 372         acpi_status status = AE_OK;
 373
 374         ACPI_FUNCTION_TRACE(tb_verify_temp_table);
 375
 376         /* Validate the table */
 377
 378         status = acpi_tb_validate_temp_table(table_desc);
 379         if (ACPI_FAILURE(status)) {
 380                 return_ACPI_STATUS(AE_NO_MEMORY);
 381         }
 382
 383         /* If a particular signature is expected (DSDT/FACS), it must match */
 384
 385         if (signature && !ACPI_COMPARE_NAME(&table_desc->signature, signature)) {
 386                 ACPI_BIOS_ERROR((AE_INFO,
 387                                  "Invalid signature 0x%X for ACPI table, expected [%s]",
 388                                  table_desc->signature.integer, signature));
 389                 status = AE_BAD_SIGNATURE;
 390                 goto invalidate_and_exit;
 391         }
 392
 393         /* Verify the checksum */
 394
 395         if (acpi_gbl_verify_table_checksum) {
 396                 status =
 397                     acpi_tb_verify_checksum(table_desc->pointer,
 398                                             table_desc->length);
 399                 if (ACPI_FAILURE(status)) {
 400                         ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY,
 401                                         "%4.4s " ACPI_PRINTF_UINT
 402                                         " Attempted table install failed",
 403                                         acpi_ut_valid_acpi_name(table_desc->
 404                                                                 signature.
 405                                                                 ascii) ?
 406                                         table_desc->signature.ascii : "????",
 407                                         ACPI_FORMAT_TO_UINT(table_desc->
 408                                                             address)));
 409                         goto invalidate_and_exit;
 410                 }
 411         }
 412
 413         return_ACPI_STATUS(AE_OK);
 414
 415 invalidate_and_exit:
 416         acpi_tb_invalidate_table(table_desc);
 417         return_ACPI_STATUS(status);
 418 }
 419
 420 /*******************************************************************************
 421  *
 422  * FUNCTION:    acpi_tb_resize_root_table_list
 423  *
 424  * PARAMETERS:  None
 425  *
 426  * RETURN:      Status
 427  *
 428  * DESCRIPTION: Expand the size of global table array
 429  *
 430  ******************************************************************************/
 431
 432 acpi_status acpi_tb_resize_root_table_list(void)
 433 {
 434         struct acpi_table_desc *tables;
 435         u32 table_count;
 436
 437         ACPI_FUNCTION_TRACE(tb_resize_root_table_list);
 438
 439         /* allow_resize flag is a parameter to acpi_initialize_tables */
 440
 441         if (!(acpi_gbl_root_table_list.flags & ACPI_ROOT_ALLOW_RESIZE)) {
 442                 ACPI_ERROR((AE_INFO,
 443                             "Resize of Root Table Array is not allowed"));
 444                 return_ACPI_STATUS(AE_SUPPORT);
 445         }
 446
 447         /* Increase the Table Array size */
 448
 449         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 450                 table_count = acpi_gbl_root_table_list.max_table_count;
 451         } else {
 452                 table_count = acpi_gbl_root_table_list.current_table_count;
 453         }
 454
 455         tables = ACPI_ALLOCATE_ZEROED(((acpi_size) table_count +
 456                                        ACPI_ROOT_TABLE_SIZE_INCREMENT) *
 457                                       sizeof(struct acpi_table_desc));
 458         if (!tables) {
 459                 ACPI_ERROR((AE_INFO,
 460                             "Could not allocate new root table array"));
 461                 return_ACPI_STATUS(AE_NO_MEMORY);
 462         }
 463
 464         /* Copy and free the previous table array */
 465
 466         if (acpi_gbl_root_table_list.tables) {
 467                 ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables,
 468                             (acpi_size) table_count *
 469                             sizeof(struct acpi_table_desc));
 470
 471                 if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 472                         ACPI_FREE(acpi_gbl_root_table_list.tables);
 473                 }
 474         }
 475
 476         acpi_gbl_root_table_list.tables = tables;
 477         acpi_gbl_root_table_list.max_table_count =
 478             table_count + ACPI_ROOT_TABLE_SIZE_INCREMENT;
 479         acpi_gbl_root_table_list.flags |= ACPI_ROOT_ORIGIN_ALLOCATED;
 480
 481         return_ACPI_STATUS(AE_OK);
 482 }
 483
 484 /*******************************************************************************
 485  *
 486  * FUNCTION:    acpi_tb_get_next_root_index
 487  *
 488  * PARAMETERS:  table_index         - Where table index is returned
 489  *
 490  * RETURN:      Status and table index.
 491  *
 492  * DESCRIPTION: Allocate a new ACPI table entry to the global table list
 493  *
 494  ******************************************************************************/
 495
 496 acpi_status acpi_tb_get_next_root_index(u32 *table_index)
 497 {
 498         acpi_status status;
 499
 500         /* Ensure that there is room for the table in the Root Table List */
 501
 502         if (acpi_gbl_root_table_list.current_table_count >=
 503             acpi_gbl_root_table_list.max_table_count) {
 504                 status = acpi_tb_resize_root_table_list();
 505                 if (ACPI_FAILURE(status)) {
 506                         return (status);
 507                 }
 508         }
 509
 510         *table_index = acpi_gbl_root_table_list.current_table_count;
 511         acpi_gbl_root_table_list.current_table_count++;
 512         return (AE_OK);
 513 }
 514
 515 /*******************************************************************************
 516  *
 517  * FUNCTION:    acpi_tb_terminate
 518  *
 519  * PARAMETERS:  None
 520  *
 521  * RETURN:      None
 522  *
 523  * DESCRIPTION: Delete all internal ACPI tables
 524  *
 525  ******************************************************************************/
 526
 527 void acpi_tb_terminate(void)
 528 {
 529         u32 i;
 530
 531         ACPI_FUNCTION_TRACE(tb_terminate);
 532
 533         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 534
 535         /* Delete the individual tables */
 536
 537         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 538                 acpi_tb_uninstall_table(&acpi_gbl_root_table_list.tables[i]);
 539         }
 540
 541         /*
 542          * Delete the root table array if allocated locally. Array cannot be
 543          * mapped, so we don't need to check for that flag.
 544          */
 545         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 546                 ACPI_FREE(acpi_gbl_root_table_list.tables);
 547         }
 548
 549         acpi_gbl_root_table_list.tables = NULL;
 550         acpi_gbl_root_table_list.flags = 0;
 551         acpi_gbl_root_table_list.current_table_count = 0;
 552
 553         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ACPI Tables freed\n"));
 554
 555         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 556         return_VOID;
 557 }
 558
 559 /*******************************************************************************
 560  *
 561  * FUNCTION:    acpi_tb_delete_namespace_by_owner
 562  *
 563  * PARAMETERS:  table_index         - Table index
 564  *
 565  * RETURN:      Status
 566  *
 567  * DESCRIPTION: Delete all namespace objects created when this table was loaded.
 568  *
 569  ******************************************************************************/
 570
 571 acpi_status acpi_tb_delete_namespace_by_owner(u32 table_index)
 572 {
 573         acpi_owner_id owner_id;
 574         acpi_status status;
 575
 576         ACPI_FUNCTION_TRACE(tb_delete_namespace_by_owner);
 577
 578         status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 579         if (ACPI_FAILURE(status)) {
 580                 return_ACPI_STATUS(status);
 581         }
 582
 583         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 584
 585                 /* The table index does not exist */
 586
 587                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 588                 return_ACPI_STATUS(AE_NOT_EXIST);
 589         }
 590
 591         /* Get the owner ID for this table, used to delete namespace nodes */
 592
 593         owner_id = acpi_gbl_root_table_list.tables[table_index].owner_id;
 594         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 595
 596         /*
 597          * Need to acquire the namespace writer lock to prevent interference
 598          * with any concurrent namespace walks. The interpreter must be
 599          * released during the deletion since the acquisition of the deletion
 600          * lock may block, and also since the execution of a namespace walk
 601          * must be allowed to use the interpreter.
 602          */
 603         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 604         status = acpi_ut_acquire_write_lock(&acpi_gbl_namespace_rw_lock);
 605
 606         acpi_ns_delete_namespace_by_owner(owner_id);
 607         if (ACPI_FAILURE(status)) {
 608                 return_ACPI_STATUS(status);
 609         }
 610
 611         acpi_ut_release_write_lock(&acpi_gbl_namespace_rw_lock);
 612
 613         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 614         return_ACPI_STATUS(status);
 615 }
 616
 617 /*******************************************************************************
 618  *
 619  * FUNCTION:    acpi_tb_allocate_owner_id
 620  *
 621  * PARAMETERS:  table_index         - Table index
 622  *
 623  * RETURN:      Status
 624  *
 625  * DESCRIPTION: Allocates owner_id in table_desc
 626  *
 627  ******************************************************************************/
 628
 629 acpi_status acpi_tb_allocate_owner_id(u32 table_index)
 630 {
 631         acpi_status status = AE_BAD_PARAMETER;
 632
 633         ACPI_FUNCTION_TRACE(tb_allocate_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                 status =
 638                     acpi_ut_allocate_owner_id(&
 639                                               (acpi_gbl_root_table_list.
 640                                                tables[table_index].owner_id));
 641         }
 642
 643         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 644         return_ACPI_STATUS(status);
 645 }
 646
 647 /*******************************************************************************
 648  *
 649  * FUNCTION:    acpi_tb_release_owner_id
 650  *
 651  * PARAMETERS:  table_index         - Table index
 652  *
 653  * RETURN:      Status
 654  *
 655  * DESCRIPTION: Releases owner_id in table_desc
 656  *
 657  ******************************************************************************/
 658
 659 acpi_status acpi_tb_release_owner_id(u32 table_index)
 660 {
 661         acpi_status status = AE_BAD_PARAMETER;
 662
 663         ACPI_FUNCTION_TRACE(tb_release_owner_id);
 664
 665         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 666         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 667                 acpi_ut_release_owner_id(&
 668                                          (acpi_gbl_root_table_list.
 669                                           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_get_owner_id
 680  *
 681  * PARAMETERS:  table_index         - Table index
 682  *              owner_id            - Where the table owner_id is returned
 683  *
 684  * RETURN:      Status
 685  *
 686  * DESCRIPTION: returns owner_id for the ACPI table
 687  *
 688  ******************************************************************************/
 689
 690 acpi_status acpi_tb_get_owner_id(u32 table_index, acpi_owner_id * owner_id)
 691 {
 692         acpi_status status = AE_BAD_PARAMETER;
 693
 694         ACPI_FUNCTION_TRACE(tb_get_owner_id);
 695
 696         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 697         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 698                 *owner_id =
 699                     acpi_gbl_root_table_list.tables[table_index].owner_id;
 700                 status = AE_OK;
 701         }
 702
 703         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 704         return_ACPI_STATUS(status);
 705 }
 706
 707 /*******************************************************************************
 708  *
 709  * FUNCTION:    acpi_tb_is_table_loaded
 710  *
 711  * PARAMETERS:  table_index         - Index into the root table
 712  *
 713  * RETURN:      Table Loaded Flag
 714  *
 715  ******************************************************************************/
 716
 717 u8 acpi_tb_is_table_loaded(u32 table_index)
 718 {
 719         u8 is_loaded = FALSE;
 720
 721         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 722         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 723                 is_loaded = (u8)
 724                     (acpi_gbl_root_table_list.tables[table_index].flags &
 725                      ACPI_TABLE_IS_LOADED);
 726         }
 727
 728         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 729         return (is_loaded);
 730 }
 731
 732 /*******************************************************************************
 733  *
 734  * FUNCTION:    acpi_tb_set_table_loaded_flag
 735  *
 736  * PARAMETERS:  table_index         - Table index
 737  *              is_loaded           - TRUE if table is loaded, FALSE otherwise
 738  *
 739  * RETURN:      None
 740  *
 741  * DESCRIPTION: Sets the table loaded flag to either TRUE or FALSE.
 742  *
 743  ******************************************************************************/
 744
 745 void acpi_tb_set_table_loaded_flag(u32 table_index, u8 is_loaded)
 746 {
 747
 748         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 749         if (table_index < acpi_gbl_root_table_list.current_table_count) {
 750                 if (is_loaded) {
 751                         acpi_gbl_root_table_list.tables[table_index].flags |=
 752                             ACPI_TABLE_IS_LOADED;
 753                 } else {
 754                         acpi_gbl_root_table_list.tables[table_index].flags &=
 755                             ~ACPI_TABLE_IS_LOADED;
 756                 }
 757         }
 758
 759         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 760 }