drivers/acpi/tables/tbxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxface - Public interfaces to the ACPI subsystem
   4  *                         ACPI table oriented interfaces
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2007, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acnamesp.h>
  47 #include <acpi/actables.h>
  48
  49 #define _COMPONENT          ACPI_TABLES
  50 ACPI_MODULE_NAME("tbxface")
  51
  52 /* Local prototypes */
  53 static acpi_status acpi_tb_load_namespace(void);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_allocate_root_table
  58  *
  59  * PARAMETERS:  initial_table_count - Size of initial_table_array, in number of
  60  *                                    struct acpi_table_desc structures
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Allocate a root table array. Used by i_aSL compiler and
  65  *              acpi_initialize_tables.
  66  *
  67  ******************************************************************************/
  68
  69 acpi_status acpi_allocate_root_table(u32 initial_table_count)
  70 {
  71
  72         acpi_gbl_root_table_list.size = initial_table_count;
  73         acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
  74
  75         return (acpi_tb_resize_root_table_list());
  76 }
  77
  78 /*******************************************************************************
  79  *
  80  * FUNCTION:    acpi_initialize_tables
  81  *
  82  * PARAMETERS:  initial_table_array - Pointer to an array of pre-allocated
  83  *                                    struct acpi_table_desc structures. If NULL, the
  84  *                                    array is dynamically allocated.
  85  *              initial_table_count - Size of initial_table_array, in number of
  86  *                                    struct acpi_table_desc structures
  87  *              allow_realloc       - Flag to tell Table Manager if resize of
  88  *                                    pre-allocated array is allowed. Ignored
  89  *                                    if initial_table_array is NULL.
  90  *
  91  * RETURN:      Status
  92  *
  93  * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
  94  *
  95  * NOTE:        Allows static allocation of the initial table array in order
  96  *              to avoid the use of dynamic memory in confined environments
  97  *              such as the kernel boot sequence where it may not be available.
  98  *
  99  *              If the host OS memory managers are initialized, use NULL for
 100  *              initial_table_array, and the table will be dynamically allocated.
 101  *
 102  ******************************************************************************/
 103
 104 acpi_status __init
 105 acpi_initialize_tables(struct acpi_table_desc * initial_table_array,
 106                        u32 initial_table_count, u8 allow_resize)
 107 {
 108         acpi_physical_address rsdp_address;
 109         acpi_status status;
 110
 111         ACPI_FUNCTION_TRACE(acpi_initialize_tables);
 112
 113         /*
 114          * Set up the Root Table Array
 115          * Allocate the table array if requested
 116          */
 117         if (!initial_table_array) {
 118                 status = acpi_allocate_root_table(initial_table_count);
 119                 if (ACPI_FAILURE(status)) {
 120                         return_ACPI_STATUS(status);
 121                 }
 122         } else {
 123                 /* Root Table Array has been statically allocated by the host */
 124
 125                 ACPI_MEMSET(initial_table_array, 0,
 126                             initial_table_count *
 127                             sizeof(struct acpi_table_desc));
 128
 129                 acpi_gbl_root_table_list.tables = initial_table_array;
 130                 acpi_gbl_root_table_list.size = initial_table_count;
 131                 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
 132                 if (allow_resize) {
 133                         acpi_gbl_root_table_list.flags |=
 134                             ACPI_ROOT_ALLOW_RESIZE;
 135                 }
 136         }
 137
 138         /* Get the address of the RSDP */
 139
 140         rsdp_address = acpi_os_get_root_pointer();
 141         if (!rsdp_address) {
 142                 return_ACPI_STATUS(AE_NOT_FOUND);
 143         }
 144
 145         /*
 146          * Get the root table (RSDT or XSDT) and extract all entries to the local
 147          * Root Table Array. This array contains the information of the RSDT/XSDT
 148          * in a common, more useable format.
 149          */
 150         status =
 151             acpi_tb_parse_root_table(rsdp_address, ACPI_TABLE_ORIGIN_MAPPED);
 152         return_ACPI_STATUS(status);
 153 }
 154
 155 /*******************************************************************************
 156  *
 157  * FUNCTION:    acpi_reallocate_root_table
 158  *
 159  * PARAMETERS:  None
 160  *
 161  * RETURN:      Status
 162  *
 163  * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
 164  *              root list from the previously provided scratch area. Should
 165  *              be called once dynamic memory allocation is available in the
 166  *              kernel
 167  *
 168  ******************************************************************************/
 169 acpi_status acpi_reallocate_root_table(void)
 170 {
 171         struct acpi_table_desc *tables;
 172         acpi_size new_size;
 173
 174         ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
 175
 176         /*
 177          * Only reallocate the root table if the host provided a static buffer
 178          * for the table array in the call to acpi_initialize_tables.
 179          */
 180         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 181                 return_ACPI_STATUS(AE_SUPPORT);
 182         }
 183
 184         new_size =
 185             (acpi_gbl_root_table_list.count +
 186              ACPI_ROOT_TABLE_SIZE_INCREMENT) * sizeof(struct acpi_table_desc);
 187
 188         /* Create new array and copy the old array */
 189
 190         tables = ACPI_ALLOCATE_ZEROED(new_size);
 191         if (!tables) {
 192                 return_ACPI_STATUS(AE_NO_MEMORY);
 193         }
 194
 195         ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, new_size);
 196
 197         acpi_gbl_root_table_list.size = acpi_gbl_root_table_list.count;
 198         acpi_gbl_root_table_list.tables = tables;
 199         acpi_gbl_root_table_list.flags =
 200             ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
 201
 202         return_ACPI_STATUS(AE_OK);
 203 }
 204 /*******************************************************************************
 205  *
 206  * FUNCTION:    acpi_load_table
 207  *
 208  * PARAMETERS:  table_ptr       - pointer to a buffer containing the entire
 209  *                                table to be loaded
 210  *
 211  * RETURN:      Status
 212  *
 213  * DESCRIPTION: This function is called to load a table from the caller's
 214  *              buffer. The buffer must contain an entire ACPI Table including
 215  *              a valid header. The header fields will be verified, and if it
 216  *              is determined that the table is invalid, the call will fail.
 217  *
 218  ******************************************************************************/
 219 acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
 220 {
 221         acpi_status status;
 222         acpi_native_uint table_index;
 223         struct acpi_table_desc table_desc;
 224
 225         if (!table_ptr)
 226                 return AE_BAD_PARAMETER;
 227
 228         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
 229         table_desc.pointer = table_ptr;
 230         table_desc.length = table_ptr->length;
 231         table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
 232
 233         /*
 234          * Install the new table into the local data structures
 235          */
 236         status = acpi_tb_add_table(&table_desc, &table_index);
 237         if (ACPI_FAILURE(status)) {
 238                 return status;
 239         }
 240         status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
 241         return status;
 242 }
 243
 244 ACPI_EXPORT_SYMBOL(acpi_load_table)
 245
 246 /******************************************************************************
 247  *
 248  * FUNCTION:    acpi_get_table_header
 249  *
 250  * PARAMETERS:  Signature           - ACPI signature of needed table
 251  *              Instance            - Which instance (for SSDTs)
 252  *              out_table_header    - The pointer to the table header to fill
 253  *
 254  * RETURN:      Status and pointer to mapped table header
 255  *
 256  * DESCRIPTION: Finds an ACPI table header.
 257  *
 258  * NOTE:        Caller is responsible in unmapping the header with
 259  *              acpi_os_unmap_memory
 260  *
 261  *****************************************************************************/
 262 acpi_status
 263 acpi_get_table_header(char *signature,
 264                       acpi_native_uint instance,
 265                       struct acpi_table_header *out_table_header)
 266 {
 267         acpi_native_uint i;
 268         acpi_native_uint j;
 269         struct acpi_table_header *header;
 270
 271         /* Parameter validation */
 272
 273         if (!signature || !out_table_header) {
 274                 return (AE_BAD_PARAMETER);
 275         }
 276
 277         /*
 278          * Walk the root table list
 279          */
 280         for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
 281                 if (!ACPI_COMPARE_NAME
 282                     (&(acpi_gbl_root_table_list.tables[i].signature),
 283                      signature)) {
 284                         continue;
 285                 }
 286
 287                 if (++j < instance) {
 288                         continue;
 289                 }
 290
 291                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
 292                         if ((acpi_gbl_root_table_list.tables[i].
 293                              flags & ACPI_TABLE_ORIGIN_MASK) ==
 294                             ACPI_TABLE_ORIGIN_MAPPED) {
 295                                 header =
 296                                     acpi_os_map_memory(acpi_gbl_root_table_list.
 297                                                        tables[i].address,
 298                                                        sizeof(struct
 299                                                               acpi_table_header));
 300                                 if (!header) {
 301                                         return AE_NO_MEMORY;
 302                                 }
 303                                 ACPI_MEMCPY(out_table_header, header,
 304                                             sizeof(struct acpi_table_header));
 305                                 acpi_os_unmap_memory(header,
 306                                                      sizeof(struct
 307                                                             acpi_table_header));
 308                         } else {
 309                                 return AE_NOT_FOUND;
 310                         }
 311                 } else {
 312                         ACPI_MEMCPY(out_table_header,
 313                                     acpi_gbl_root_table_list.tables[i].pointer,
 314                                     sizeof(struct acpi_table_header));
 315                 }
 316                 return (AE_OK);
 317         }
 318
 319         return (AE_NOT_FOUND);
 320 }
 321
 322 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
 323
 324
 325 /******************************************************************************
 326  *
 327  * FUNCTION:    acpi_unload_table_id
 328  *
 329  * PARAMETERS:  id            - Owner ID of the table to be removed.
 330  *
 331  * RETURN:      Status
 332  *
 333  * DESCRIPTION: This routine is used to force the unload of a table (by id)
 334  *
 335  ******************************************************************************/
 336 acpi_status acpi_unload_table_id(acpi_owner_id id)
 337 {
 338         int i;
 339         acpi_status status = AE_NOT_EXIST;
 340
 341         ACPI_FUNCTION_TRACE(acpi_unload_table);
 342
 343         /* Find table from the requested type list */
 344         for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
 345                 if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
 346                         continue;
 347                 }
 348                 /*
 349                 * Delete all namespace objects owned by this table. Note that these
 350                 * objects can appear anywhere in the namespace by virtue of the AML
 351                 * "Scope" operator. Thus, we need to track ownership by an ID, not
 352                 * simply a position within the hierarchy
 353                 */
 354                 acpi_tb_delete_namespace_by_owner(i);
 355                 acpi_tb_release_owner_id(i);
 356                 acpi_tb_set_table_loaded_flag(i, FALSE);
 357         }
 358         return_ACPI_STATUS(status);
 359 }
 360
 361 ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
 362
 363 /*******************************************************************************
 364  *
 365  * FUNCTION:    acpi_get_table
 366  *
 367  * PARAMETERS:  Signature           - ACPI signature of needed table
 368  *              Instance            - Which instance (for SSDTs)
 369  *              out_table           - Where the pointer to the table is returned
 370  *
 371  * RETURN:      Status and pointer to table
 372  *
 373  * DESCRIPTION: Finds and verifies an ACPI table.
 374  *
 375  *****************************************************************************/
 376 acpi_status
 377 acpi_get_table(char *signature,
 378                acpi_native_uint instance, struct acpi_table_header ** out_table)
 379 {
 380         acpi_native_uint i;
 381         acpi_native_uint j;
 382         acpi_status status;
 383
 384         /* Parameter validation */
 385
 386         if (!signature || !out_table) {
 387                 return (AE_BAD_PARAMETER);
 388         }
 389
 390         /*
 391          * Walk the root table list
 392          */
 393         for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
 394                 if (!ACPI_COMPARE_NAME
 395                     (&(acpi_gbl_root_table_list.tables[i].signature),
 396                      signature)) {
 397                         continue;
 398                 }
 399
 400                 if (++j < instance) {
 401                         continue;
 402                 }
 403
 404                 status =
 405                     acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
 406                 if (ACPI_SUCCESS(status)) {
 407                         *out_table = acpi_gbl_root_table_list.tables[i].pointer;
 408                 }
 409
 410                 if (!acpi_gbl_permanent_mmap) {
 411                         acpi_gbl_root_table_list.tables[i].pointer = NULL;
 412                 }
 413
 414                 return (status);
 415         }
 416
 417         return (AE_NOT_FOUND);
 418 }
 419
 420 ACPI_EXPORT_SYMBOL(acpi_get_table)
 421
 422 /*******************************************************************************
 423  *
 424  * FUNCTION:    acpi_get_table_by_index
 425  *
 426  * PARAMETERS:  table_index         - Table index
 427  *              Table               - Where the pointer to the table is returned
 428  *
 429  * RETURN:      Status and pointer to the table
 430  *
 431  * DESCRIPTION: Obtain a table by an index into the global table list.
 432  *
 433  ******************************************************************************/
 434 acpi_status
 435 acpi_get_table_by_index(acpi_native_uint table_index,
 436                         struct acpi_table_header ** table)
 437 {
 438         acpi_status status;
 439
 440         ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
 441
 442         /* Parameter validation */
 443
 444         if (!table) {
 445                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 446         }
 447
 448         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 449
 450         /* Validate index */
 451
 452         if (table_index >= acpi_gbl_root_table_list.count) {
 453                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 454                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 455         }
 456
 457         if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
 458
 459                 /* Table is not mapped, map it */
 460
 461                 status =
 462                     acpi_tb_verify_table(&acpi_gbl_root_table_list.
 463                                          tables[table_index]);
 464                 if (ACPI_FAILURE(status)) {
 465                         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 466                         return_ACPI_STATUS(status);
 467                 }
 468         }
 469
 470         *table = acpi_gbl_root_table_list.tables[table_index].pointer;
 471         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 472         return_ACPI_STATUS(AE_OK);
 473 }
 474
 475 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
 476
 477 /*******************************************************************************
 478  *
 479  * FUNCTION:    acpi_tb_load_namespace
 480  *
 481  * PARAMETERS:  None
 482  *
 483  * RETURN:      Status
 484  *
 485  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
 486  *              the RSDT/XSDT.
 487  *
 488  ******************************************************************************/
 489 static acpi_status acpi_tb_load_namespace(void)
 490 {
 491         acpi_status status;
 492         struct acpi_table_header *table;
 493         acpi_native_uint i;
 494
 495         ACPI_FUNCTION_TRACE(tb_load_namespace);
 496
 497         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 498
 499         /*
 500          * Load the namespace. The DSDT is required, but any SSDT and PSDT tables
 501          * are optional.
 502          */
 503         if (!acpi_gbl_root_table_list.count ||
 504             !ACPI_COMPARE_NAME(&
 505                                (acpi_gbl_root_table_list.
 506                                 tables[ACPI_TABLE_INDEX_DSDT].signature),
 507                                ACPI_SIG_DSDT)
 508             ||
 509             ACPI_FAILURE(acpi_tb_verify_table
 510                          (&acpi_gbl_root_table_list.
 511                           tables[ACPI_TABLE_INDEX_DSDT]))) {
 512                 status = AE_NO_ACPI_TABLES;
 513                 goto unlock_and_exit;
 514         }
 515
 516         /*
 517          * Find DSDT table
 518          */
 519         status =
 520             acpi_os_table_override(acpi_gbl_root_table_list.
 521                                    tables[ACPI_TABLE_INDEX_DSDT].pointer,
 522                                    &table);
 523         if (ACPI_SUCCESS(status) && table) {
 524                 /*
 525                  * DSDT table has been found
 526                  */
 527                 acpi_tb_delete_table(&acpi_gbl_root_table_list.
 528                                      tables[ACPI_TABLE_INDEX_DSDT]);
 529                 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer =
 530                     table;
 531                 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].length =
 532                     table->length;
 533                 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].flags =
 534                     ACPI_TABLE_ORIGIN_UNKNOWN;
 535
 536                 ACPI_INFO((AE_INFO, "Table DSDT replaced by host OS"));
 537                 acpi_tb_print_table_header(0, table);
 538         }
 539
 540         status =
 541             acpi_tb_verify_table(&acpi_gbl_root_table_list.
 542                                  tables[ACPI_TABLE_INDEX_DSDT]);
 543         if (ACPI_FAILURE(status)) {
 544
 545                 /* A valid DSDT is required */
 546
 547                 status = AE_NO_ACPI_TABLES;
 548                 goto unlock_and_exit;
 549         }
 550
 551         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 552
 553         /*
 554          * Load and parse tables.
 555          */
 556         status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
 557         if (ACPI_FAILURE(status)) {
 558                 return_ACPI_STATUS(status);
 559         }
 560
 561         /*
 562          * Load any SSDT or PSDT tables. Note: Loop leaves tables locked
 563          */
 564         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 565         for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
 566                 if ((!ACPI_COMPARE_NAME
 567                      (&(acpi_gbl_root_table_list.tables[i].signature),
 568                       ACPI_SIG_SSDT)
 569                      &&
 570                      !ACPI_COMPARE_NAME(&
 571                                         (acpi_gbl_root_table_list.tables[i].
 572                                          signature), ACPI_SIG_PSDT))
 573                     ||
 574                     ACPI_FAILURE(acpi_tb_verify_table
 575                                  (&acpi_gbl_root_table_list.tables[i]))) {
 576                         continue;
 577                 }
 578
 579                 /* Ignore errors while loading tables, get as many as possible */
 580
 581                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 582                 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
 583                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 584         }
 585
 586         ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
 587
 588       unlock_and_exit:
 589         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 590         return_ACPI_STATUS(status);
 591 }
 592
 593 /*******************************************************************************
 594  *
 595  * FUNCTION:    acpi_load_tables
 596  *
 597  * PARAMETERS:  None
 598  *
 599  * RETURN:      Status
 600  *
 601  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
 602  *
 603  ******************************************************************************/
 604
 605 acpi_status acpi_load_tables(void)
 606 {
 607         acpi_status status;
 608
 609         ACPI_FUNCTION_TRACE(acpi_load_tables);
 610
 611         /*
 612          * Load the namespace from the tables
 613          */
 614         status = acpi_tb_load_namespace();
 615         if (ACPI_FAILURE(status)) {
 616                 ACPI_EXCEPTION((AE_INFO, status,
 617                                 "While loading namespace from ACPI tables"));
 618         }
 619
 620         return_ACPI_STATUS(status);
 621 }
 622
 623 ACPI_EXPORT_SYMBOL(acpi_load_tables)