git.oblomov.eu Git - linux-2.6/blob - 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 - 2006, 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_initialize_tables
  58  *
  59  * PARAMETERS:  initial_table_array - Pointer to an array of pre-allocated
  60  *                                    struct acpi_table_desc structures. If NULL, the
  61  *                                    array is dynamically allocated.
  62  *              initial_table_count - Size of initial_table_array, in number of
  63  *                                    struct acpi_table_desc structures
  64  *              allow_realloc       - Flag to tell Table Manager if resize of
  65  *                                    pre-allocated array is allowed. Ignored
  66  *                                    if initial_table_array is NULL.
  67  *
  68  * RETURN:      Status
  69  *
  70  * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
  71  *
  72  * NOTE:        Allows static allocation of the initial table array in order
  73  *              to avoid the use of dynamic memory in confined environments
  74  *              such as the kernel boot sequence where it may not be available.
  75  *
  76  *              If the host OS memory managers are initialized, use NULL for
  77  *              initial_table_array, and the table will be dynamically allocated.
  78  *
  79  ******************************************************************************/
  80
  81 acpi_status __init
  82 acpi_initialize_tables(struct acpi_table_desc *initial_table_array,
  83                        u32 initial_table_count, u8 allow_resize)
  84 {
  85         acpi_physical_address rsdp_address;
  86         acpi_status status;
  87
  88         ACPI_FUNCTION_TRACE(acpi_initialize_tables);
  89
  90         /*
  91          * Set up the Root Table Array
  92          * Allocate the table array if requested
  93          */
  94         if (!initial_table_array) {
  95                 acpi_gbl_root_table_list.size = initial_table_count;
  96                 acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
  97
  98                 status = acpi_tb_resize_root_table_list();
  99                 if (ACPI_FAILURE(status)) {
 100                         return_ACPI_STATUS(status);
 101                 }
 102         } else {
 103                 /* Root Table Array has been statically allocated by the host */
 104
 105                 ACPI_MEMSET(initial_table_array, 0,
 106                             initial_table_count *
 107                             sizeof(struct acpi_table_desc));
 108
 109                 acpi_gbl_root_table_list.tables = initial_table_array;
 110                 acpi_gbl_root_table_list.size = initial_table_count;
 111                 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
 112                 if (allow_resize) {
 113                         acpi_gbl_root_table_list.flags |=
 114                             ACPI_ROOT_ALLOW_RESIZE;
 115                 }
 116         }
 117
 118         /* Get the address of the RSDP */
 119
 120         rsdp_address = acpi_os_get_root_pointer();
 121         if (!rsdp_address) {
 122                 return_ACPI_STATUS(AE_NOT_FOUND);
 123         }
 124
 125         /*
 126          * Get the root table (RSDT or XSDT) and extract all entries to the local
 127          * Root Table Array. This array contains the information of the RSDT/XSDT
 128          * in a common, more useable format.
 129          */
 130         status =
 131             acpi_tb_parse_root_table(rsdp_address, ACPI_TABLE_ORIGIN_MAPPED);
 132         return_ACPI_STATUS(status);
 133 }
 134
 135 /*******************************************************************************
 136  *
 137  * FUNCTION:    acpi_reallocate_root_table
 138  *
 139  * PARAMETERS:  None
 140  *
 141  * RETURN:      Status
 142  *
 143  * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
 144  *              root list from the previously provided scratch area. Should
 145  *              be called once dynamic memory allocation is available in the
 146  *              kernel
 147  *
 148  ******************************************************************************/
 149 acpi_status acpi_reallocate_root_table(void)
 150 {
 151         struct acpi_table_desc *tables;
 152         acpi_size new_size;
 153
 154         ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
 155
 156         /*
 157          * Only reallocate the root table if the host provided a static buffer
 158          * for the table array in the call to acpi_initialize_tables.
 159          */
 160         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
 161                 return_ACPI_STATUS(AE_SUPPORT);
 162         }
 163
 164         new_size =
 165             (acpi_gbl_root_table_list.count +
 166              ACPI_ROOT_TABLE_SIZE_INCREMENT) * sizeof(struct acpi_table_desc);
 167
 168         /* Create new array and copy the old array */
 169
 170         tables = ACPI_ALLOCATE_ZEROED(new_size);
 171         if (!tables) {
 172                 return_ACPI_STATUS(AE_NO_MEMORY);
 173         }
 174
 175         ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, new_size);
 176
 177         acpi_gbl_root_table_list.size = acpi_gbl_root_table_list.count;
 178         acpi_gbl_root_table_list.tables = tables;
 179         acpi_gbl_root_table_list.flags =
 180             ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
 181
 182         return_ACPI_STATUS(AE_OK);
 183 }
 184 /*******************************************************************************
 185  *
 186  * FUNCTION:    acpi_load_table
 187  *
 188  * PARAMETERS:  table_ptr       - pointer to a buffer containing the entire
 189  *                                table to be loaded
 190  *
 191  * RETURN:      Status
 192  *
 193  * DESCRIPTION: This function is called to load a table from the caller's
 194  *              buffer. The buffer must contain an entire ACPI Table including
 195  *              a valid header. The header fields will be verified, and if it
 196  *              is determined that the table is invalid, the call will fail.
 197  *
 198  ******************************************************************************/
 199 acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
 200 {
 201         acpi_status status;
 202         acpi_native_uint table_index;
 203
 204         /*
 205          * Install the new table into the local data structures
 206          */
 207         status = acpi_tb_add_table(table_ptr, &table_index);
 208         if (ACPI_FAILURE(status)) {
 209                 return_ACPI_STATUS(status);
 210         }
 211         status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
 212         return_ACPI_STATUS(status);
 213 }
 214
 215 ACPI_EXPORT_SYMBOL(acpi_load_table)
 216
 217 /******************************************************************************
 218  *
 219  * FUNCTION:    acpi_get_table_header
 220  *
 221  * PARAMETERS:  Signature           - ACPI signature of needed table
 222  *              Instance            - Which instance (for SSDTs)
 223  *              out_table_header    - Where the pointer to the table header
 224  *                                    is returned
 225  *
 226  * RETURN:      Status and pointer to mapped table header
 227  *
 228  * DESCRIPTION: Finds an ACPI table header.
 229  *
 230  * NOTE:        Caller is responsible in unmapping the header with
 231  *              acpi_os_unmap_memory
 232  *
 233  *****************************************************************************/
 234 acpi_status
 235 acpi_get_table_header(char *signature,
 236                       acpi_native_uint instance,
 237                       struct acpi_table_header **out_table_header)
 238 {
 239         acpi_native_uint i;
 240         acpi_native_uint j;
 241
 242         /* Parameter validation */
 243
 244         if (!signature || !out_table_header) {
 245                 return (AE_BAD_PARAMETER);
 246         }
 247
 248         /*
 249          * Walk the root table list
 250          */
 251         for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
 252                 if (!ACPI_COMPARE_NAME
 253                     (&(acpi_gbl_root_table_list.tables[i].signature),
 254                      signature)) {
 255                         continue;
 256                 }
 257
 258                 if (++j < instance) {
 259                         continue;
 260                 }
 261
 262                 *out_table_header =
 263                     acpi_tb_map(acpi_gbl_root_table_list.tables[i].address,
 264                                 (u32) sizeof(struct acpi_table_header),
 265                                 acpi_gbl_root_table_list.tables[i].
 266                                 flags & ACPI_TABLE_ORIGIN_MASK);
 267
 268                 if (!(*out_table_header)) {
 269                         return (AE_NO_MEMORY);
 270                 }
 271
 272                 return (AE_OK);
 273         }
 274
 275         return (AE_NOT_FOUND);
 276 }
 277
 278 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
 279
 280
 281 /******************************************************************************
 282  *
 283  * FUNCTION:    acpi_unload_table_id
 284  *
 285  * PARAMETERS:  id            - Owner ID of the table to be removed.
 286  *
 287  * RETURN:      Status
 288  *
 289  * DESCRIPTION: This routine is used to force the unload of a table (by id)
 290  *
 291  ******************************************************************************/
 292 acpi_status acpi_unload_table_id(acpi_owner_id id)
 293 {
 294         int i;
 295         acpi_status status = AE_NOT_EXIST;
 296
 297         ACPI_FUNCTION_TRACE(acpi_unload_table);
 298
 299         /* Find table from the requested type list */
 300         for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
 301                 if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
 302                         continue;
 303                 }
 304                 /*
 305                 * Delete all namespace objects owned by this table. Note that these
 306                 * objects can appear anywhere in the namespace by virtue of the AML
 307                 * "Scope" operator. Thus, we need to track ownership by an ID, not
 308                 * simply a position within the hierarchy
 309                 */
 310                 acpi_tb_delete_namespace_by_owner(i);
 311                 acpi_tb_release_owner_id(i);
 312                 acpi_tb_set_table_loaded_flag(i, FALSE);
 313         }
 314         return_ACPI_STATUS(status);
 315 }
 316
 317 ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
 318
 319 /*******************************************************************************
 320  *
 321  * FUNCTION:    acpi_get_table
 322  *
 323  * PARAMETERS:  Signature           - ACPI signature of needed table
 324  *              Instance            - Which instance (for SSDTs)
 325  *              out_table           - Where the pointer to the table is returned
 326  *
 327  * RETURN:      Status and pointer to table
 328  *
 329  * DESCRIPTION: Finds and verifies an ACPI table.
 330  *
 331  *****************************************************************************/
 332 acpi_status
 333 acpi_get_table(char *signature,
 334                acpi_native_uint instance, struct acpi_table_header ** out_table)
 335 {
 336         acpi_native_uint i;
 337         acpi_native_uint j;
 338         acpi_status status;
 339
 340         /* Parameter validation */
 341
 342         if (!signature || !out_table) {
 343                 return (AE_BAD_PARAMETER);
 344         }
 345
 346         /*
 347          * Walk the root table list
 348          */
 349         for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
 350                 if (!ACPI_COMPARE_NAME
 351                     (&(acpi_gbl_root_table_list.tables[i].signature),
 352                      signature)) {
 353                         continue;
 354                 }
 355
 356                 if (++j < instance) {
 357                         continue;
 358                 }
 359
 360                 status =
 361                     acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
 362                 if (ACPI_SUCCESS(status)) {
 363                         *out_table = acpi_gbl_root_table_list.tables[i].pointer;
 364                 }
 365
 366                 if (!acpi_gbl_permanent_mmap) {
 367                         acpi_gbl_root_table_list.tables[i].pointer = 0;
 368                 }
 369
 370                 return (status);
 371         }
 372
 373         return (AE_NOT_FOUND);
 374 }
 375
 376 ACPI_EXPORT_SYMBOL(acpi_get_table)
 377
 378 /*******************************************************************************
 379  *
 380  * FUNCTION:    acpi_get_table_by_index
 381  *
 382  * PARAMETERS:  table_index         - Table index
 383  *              Table               - Where the pointer to the table is returned
 384  *
 385  * RETURN:      Status and pointer to the table
 386  *
 387  * DESCRIPTION: Obtain a table by an index into the global table list.
 388  *
 389  ******************************************************************************/
 390 acpi_status
 391 acpi_get_table_by_index(acpi_native_uint table_index,
 392                         struct acpi_table_header ** table)
 393 {
 394         acpi_status status;
 395
 396         ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
 397
 398         /* Parameter validation */
 399
 400         if (!table) {
 401                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 402         }
 403
 404         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 405
 406         /* Validate index */
 407
 408         if (table_index >= acpi_gbl_root_table_list.count) {
 409                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 410                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 411         }
 412
 413         if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
 414
 415                 /* Table is not mapped, map it */
 416
 417                 status =
 418                     acpi_tb_verify_table(&acpi_gbl_root_table_list.
 419                                          tables[table_index]);
 420                 if (ACPI_FAILURE(status)) {
 421                         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 422                         return_ACPI_STATUS(status);
 423                 }
 424         }
 425
 426         *table = acpi_gbl_root_table_list.tables[table_index].pointer;
 427         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 428         return_ACPI_STATUS(AE_OK);
 429 }
 430
 431 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
 432
 433 /*******************************************************************************
 434  *
 435  * FUNCTION:    acpi_tb_load_namespace
 436  *
 437  * PARAMETERS:  None
 438  *
 439  * RETURN:      Status
 440  *
 441  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
 442  *              the RSDT/XSDT.
 443  *
 444  ******************************************************************************/
 445 static acpi_status acpi_tb_load_namespace(void)
 446 {
 447         acpi_status status;
 448         struct acpi_table_header *table;
 449         acpi_native_uint i;
 450
 451         ACPI_FUNCTION_TRACE(tb_load_namespace);
 452
 453         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 454
 455         /*
 456          * Load the namespace. The DSDT is required, but any SSDT and PSDT tables
 457          * are optional.
 458          */
 459         if (!acpi_gbl_root_table_list.count ||
 460             !ACPI_COMPARE_NAME(&
 461                                (acpi_gbl_root_table_list.
 462                                 tables[ACPI_TABLE_INDEX_DSDT].signature),
 463                                ACPI_SIG_DSDT)
 464             ||
 465             ACPI_FAILURE(acpi_tb_verify_table
 466                          (&acpi_gbl_root_table_list.
 467                           tables[ACPI_TABLE_INDEX_DSDT]))) {
 468                 status = AE_NO_ACPI_TABLES;
 469                 goto unlock_and_exit;
 470         }
 471
 472         /*
 473          * Find DSDT table
 474          */
 475         status =
 476             acpi_os_table_override(acpi_gbl_root_table_list.
 477                                    tables[ACPI_TABLE_INDEX_DSDT].pointer,
 478                                    &table);
 479         if (ACPI_SUCCESS(status) && table) {
 480                 /*
 481                  * DSDT table has been found
 482                  */
 483                 acpi_tb_delete_table(ACPI_TABLE_INDEX_DSDT);
 484                 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer =
 485                     table;
 486                 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].length =
 487                     table->length;
 488                 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].flags =
 489                     ACPI_TABLE_ORIGIN_UNKNOWN;
 490
 491                 ACPI_INFO((AE_INFO, "Table DSDT replaced by host OS"));
 492                 acpi_tb_print_table_header(0, table);
 493         }
 494
 495         status =
 496             acpi_tb_verify_table(&acpi_gbl_root_table_list.
 497                                  tables[ACPI_TABLE_INDEX_DSDT]);
 498         if (ACPI_FAILURE(status)) {
 499
 500                 /* A valid DSDT is required */
 501
 502                 status = AE_NO_ACPI_TABLES;
 503                 goto unlock_and_exit;
 504         }
 505
 506         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 507
 508         /*
 509          * Load and parse tables.
 510          */
 511         status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
 512         if (ACPI_FAILURE(status)) {
 513                 return_ACPI_STATUS(status);
 514         }
 515
 516         /*
 517          * Load any SSDT or PSDT tables. Note: Loop leaves tables locked
 518          */
 519         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 520         for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
 521                 if ((!ACPI_COMPARE_NAME
 522                      (&(acpi_gbl_root_table_list.tables[i].signature),
 523                       ACPI_SIG_SSDT)
 524                      &&
 525                      !ACPI_COMPARE_NAME(&
 526                                         (acpi_gbl_root_table_list.tables[i].
 527                                          signature), ACPI_SIG_PSDT))
 528                     ||
 529                     ACPI_FAILURE(acpi_tb_verify_table
 530                                  (&acpi_gbl_root_table_list.tables[i]))) {
 531                         continue;
 532                 }
 533
 534                 /* Ignore errors while loading tables, get as many as possible */
 535
 536                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 537                 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
 538                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 539         }
 540
 541         ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
 542
 543       unlock_and_exit:
 544         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 545         return_ACPI_STATUS(status);
 546 }
 547
 548 /*******************************************************************************
 549  *
 550  * FUNCTION:    acpi_load_tables
 551  *
 552  * PARAMETERS:  None
 553  *
 554  * RETURN:      Status
 555  *
 556  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
 557  *
 558  ******************************************************************************/
 559
 560 acpi_status acpi_load_tables(void)
 561 {
 562         acpi_status status;
 563
 564         ACPI_FUNCTION_TRACE(acpi_load_tables);
 565
 566         /*
 567          * Load the namespace from the tables
 568          */
 569         status = acpi_tb_load_namespace();
 570         if (ACPI_FAILURE(status)) {
 571                 ACPI_EXCEPTION((AE_INFO, status,
 572                                 "While loading namespace from ACPI tables"));
 573         }
 574
 575         return_ACPI_STATUS(status);
 576 }
 577
 578 ACPI_EXPORT_SYMBOL(acpi_load_tables)