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 - 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  *
 207  * FUNCTION:    acpi_load_table
 208  *
 209  * PARAMETERS:  table_ptr       - pointer to a buffer containing the entire
 210  *                                table to be loaded
 211  *
 212  * RETURN:      Status
 213  *
 214  * DESCRIPTION: This function is called to load a table from the caller's
 215  *              buffer. The buffer must contain an entire ACPI Table including
 216  *              a valid header. The header fields will be verified, and if it
 217  *              is determined that the table is invalid, the call will fail.
 218  *
 219  ******************************************************************************/
 220 acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
 221 {
 222         acpi_status status;
 223         acpi_native_uint table_index;
 224         struct acpi_table_desc table_desc;
 225
 226         if (!table_ptr)
 227                 return AE_BAD_PARAMETER;
 228
 229         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
 230         table_desc.pointer = table_ptr;
 231         table_desc.length = table_ptr->length;
 232         table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
 233
 234         /*
 235          * Install the new table into the local data structures
 236          */
 237         status = acpi_tb_add_table(&table_desc, &table_index);
 238         if (ACPI_FAILURE(status)) {
 239                 return status;
 240         }
 241         status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
 242         return status;
 243 }
 244
 245 ACPI_EXPORT_SYMBOL(acpi_load_table)
 246
 247 /******************************************************************************
 248  *
 249  * FUNCTION:    acpi_get_table_header
 250  *
 251  * PARAMETERS:  Signature           - ACPI signature of needed table
 252  *              Instance            - Which instance (for SSDTs)
 253  *              out_table_header    - The pointer to the table header to fill
 254  *
 255  * RETURN:      Status and pointer to mapped table header
 256  *
 257  * DESCRIPTION: Finds an ACPI table header.
 258  *
 259  * NOTE:        Caller is responsible in unmapping the header with
 260  *              acpi_os_unmap_memory
 261  *
 262  *****************************************************************************/
 263 acpi_status
 264 acpi_get_table_header(char *signature,
 265                       acpi_native_uint instance,
 266                       struct acpi_table_header * out_table_header)
 267 {
 268         acpi_native_uint i;
 269         acpi_native_uint j;
 270         struct acpi_table_header *header;
 271
 272         /* Parameter validation */
 273
 274         if (!signature || !out_table_header) {
 275                 return (AE_BAD_PARAMETER);
 276         }
 277
 278         /*
 279          * Walk the root table list
 280          */
 281         for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
 282                 if (!ACPI_COMPARE_NAME
 283                     (&(acpi_gbl_root_table_list.tables[i].signature),
 284                      signature)) {
 285                         continue;
 286                 }
 287
 288                 if (++j < instance) {
 289                         continue;
 290                 }
 291
 292                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
 293                         if ((acpi_gbl_root_table_list.tables[i].
 294                              flags & ACPI_TABLE_ORIGIN_MASK) ==
 295                             ACPI_TABLE_ORIGIN_MAPPED) {
 296                                 header =
 297                                     acpi_os_map_memory(acpi_gbl_root_table_list.
 298                                                        tables[i].address,
 299                                                        sizeof(struct
 300                                                               acpi_table_header));
 301                                 if (!header) {
 302                                         return AE_NO_MEMORY;
 303                                 }
 304                                 ACPI_MEMCPY(out_table_header, header,
 305                                             sizeof(struct acpi_table_header));
 306                                 acpi_os_unmap_memory(header,
 307                                                      sizeof(struct
 308                                                             acpi_table_header));
 309                         } else {
 310                                 return AE_NOT_FOUND;
 311                         }
 312                 } else {
 313                         ACPI_MEMCPY(out_table_header,
 314                                     acpi_gbl_root_table_list.tables[i].pointer,
 315                                     sizeof(struct acpi_table_header));
 316                 }
 317                 return (AE_OK);
 318         }
 319
 320         return (AE_NOT_FOUND);
 321 }
 322
 323 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
 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_id);
 342
 343         /* Find table in the global table 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                 status = acpi_tb_release_owner_id(i);
 356                 acpi_tb_set_table_loaded_flag(i, FALSE);
 357                 break;
 358         }
 359         return_ACPI_STATUS(status);
 360 }
 361
 362 ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
 363
 364 /*******************************************************************************
 365  *
 366  * FUNCTION:    acpi_get_table
 367  *
 368  * PARAMETERS:  Signature           - ACPI signature of needed table
 369  *              Instance            - Which instance (for SSDTs)
 370  *              out_table           - Where the pointer to the table is returned
 371  *
 372  * RETURN:      Status and pointer to table
 373  *
 374  * DESCRIPTION: Finds and verifies an ACPI table.
 375  *
 376  *****************************************************************************/
 377 acpi_status
 378 acpi_get_table(char *signature,
 379                acpi_native_uint instance, struct acpi_table_header **out_table)
 380 {
 381         acpi_native_uint i;
 382         acpi_native_uint j;
 383         acpi_status status;
 384
 385         /* Parameter validation */
 386
 387         if (!signature || !out_table) {
 388                 return (AE_BAD_PARAMETER);
 389         }
 390
 391         /*
 392          * Walk the root table list
 393          */
 394         for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
 395                 if (!ACPI_COMPARE_NAME
 396                     (&(acpi_gbl_root_table_list.tables[i].signature),
 397                      signature)) {
 398                         continue;
 399                 }
 400
 401                 if (++j < instance) {
 402                         continue;
 403                 }
 404
 405                 status =
 406                     acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
 407                 if (ACPI_SUCCESS(status)) {
 408                         *out_table = acpi_gbl_root_table_list.tables[i].pointer;
 409                 }
 410
 411                 if (!acpi_gbl_permanent_mmap) {
 412                         acpi_gbl_root_table_list.tables[i].pointer = NULL;
 413                 }
 414
 415                 return (status);
 416         }
 417
 418         return (AE_NOT_FOUND);
 419 }
 420
 421 ACPI_EXPORT_SYMBOL(acpi_get_table)
 422
 423 /*******************************************************************************
 424  *
 425  * FUNCTION:    acpi_get_table_by_index
 426  *
 427  * PARAMETERS:  table_index         - Table index
 428  *              Table               - Where the pointer to the table is returned
 429  *
 430  * RETURN:      Status and pointer to the table
 431  *
 432  * DESCRIPTION: Obtain a table by an index into the global table list.
 433  *
 434  ******************************************************************************/
 435 acpi_status
 436 acpi_get_table_by_index(acpi_native_uint table_index,
 437                         struct acpi_table_header ** table)
 438 {
 439         acpi_status status;
 440
 441         ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
 442
 443         /* Parameter validation */
 444
 445         if (!table) {
 446                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 447         }
 448
 449         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 450
 451         /* Validate index */
 452
 453         if (table_index >= acpi_gbl_root_table_list.count) {
 454                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 455                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 456         }
 457
 458         if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
 459
 460                 /* Table is not mapped, map it */
 461
 462                 status =
 463                     acpi_tb_verify_table(&acpi_gbl_root_table_list.
 464                                          tables[table_index]);
 465                 if (ACPI_FAILURE(status)) {
 466                         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 467                         return_ACPI_STATUS(status);
 468                 }
 469         }
 470
 471         *table = acpi_gbl_root_table_list.tables[table_index].pointer;
 472         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 473         return_ACPI_STATUS(AE_OK);
 474 }
 475
 476 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
 477
 478 /*******************************************************************************
 479  *
 480  * FUNCTION:    acpi_tb_load_namespace
 481  *
 482  * PARAMETERS:  None
 483  *
 484  * RETURN:      Status
 485  *
 486  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
 487  *              the RSDT/XSDT.
 488  *
 489  ******************************************************************************/
 490 static acpi_status acpi_tb_load_namespace(void)
 491 {
 492         acpi_status status;
 493         struct acpi_table_header *table;
 494         acpi_native_uint i;
 495
 496         ACPI_FUNCTION_TRACE(tb_load_namespace);
 497
 498         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 499
 500         /*
 501          * Load the namespace. The DSDT is required, but any SSDT and PSDT tables
 502          * are optional.
 503          */
 504         if (!acpi_gbl_root_table_list.count ||
 505             !ACPI_COMPARE_NAME(&
 506                                (acpi_gbl_root_table_list.
 507                                 tables[ACPI_TABLE_INDEX_DSDT].signature),
 508                                ACPI_SIG_DSDT)
 509             ||
 510             ACPI_FAILURE(acpi_tb_verify_table
 511                          (&acpi_gbl_root_table_list.
 512                           tables[ACPI_TABLE_INDEX_DSDT]))) {
 513                 status = AE_NO_ACPI_TABLES;
 514                 goto unlock_and_exit;
 515         }
 516
 517         /*
 518          * Find DSDT table
 519          */
 520         status =
 521             acpi_os_table_override(acpi_gbl_root_table_list.
 522                                    tables[ACPI_TABLE_INDEX_DSDT].pointer,
 523                                    &table);
 524         if (ACPI_SUCCESS(status) && table) {
 525                 /*
 526                  * DSDT table has been found
 527                  */
 528                 acpi_tb_delete_table(&acpi_gbl_root_table_list.
 529                                      tables[ACPI_TABLE_INDEX_DSDT]);
 530                 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer =
 531                     table;
 532                 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].length =
 533                     table->length;
 534                 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].flags =
 535                     ACPI_TABLE_ORIGIN_UNKNOWN;
 536
 537                 ACPI_INFO((AE_INFO, "Table DSDT replaced by host OS"));
 538                 acpi_tb_print_table_header(0, table);
 539         }
 540
 541         status =
 542             acpi_tb_verify_table(&acpi_gbl_root_table_list.
 543                                  tables[ACPI_TABLE_INDEX_DSDT]);
 544         if (ACPI_FAILURE(status)) {
 545
 546                 /* A valid DSDT is required */
 547
 548                 status = AE_NO_ACPI_TABLES;
 549                 goto unlock_and_exit;
 550         }
 551
 552         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 553
 554         /*
 555          * Load and parse tables.
 556          */
 557         status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
 558         if (ACPI_FAILURE(status)) {
 559                 return_ACPI_STATUS(status);
 560         }
 561
 562         /*
 563          * Load any SSDT or PSDT tables. Note: Loop leaves tables locked
 564          */
 565         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 566         for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
 567                 if ((!ACPI_COMPARE_NAME
 568                      (&(acpi_gbl_root_table_list.tables[i].signature),
 569                       ACPI_SIG_SSDT)
 570                      &&
 571                      !ACPI_COMPARE_NAME(&
 572                                         (acpi_gbl_root_table_list.tables[i].
 573                                          signature), ACPI_SIG_PSDT))
 574                     ||
 575                     ACPI_FAILURE(acpi_tb_verify_table
 576                                  (&acpi_gbl_root_table_list.tables[i]))) {
 577                         continue;
 578                 }
 579
 580                 /* Ignore errors while loading tables, get as many as possible */
 581
 582                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 583                 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
 584                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 585         }
 586
 587         ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
 588
 589       unlock_and_exit:
 590         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 591         return_ACPI_STATUS(status);
 592 }
 593
 594 /*******************************************************************************
 595  *
 596  * FUNCTION:    acpi_load_tables
 597  *
 598  * PARAMETERS:  None
 599  *
 600  * RETURN:      Status
 601  *
 602  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
 603  *
 604  ******************************************************************************/
 605
 606 acpi_status acpi_load_tables(void)
 607 {
 608         acpi_status status;
 609
 610         ACPI_FUNCTION_TRACE(acpi_load_tables);
 611
 612         /*
 613          * Load the namespace from the tables
 614          */
 615         status = acpi_tb_load_namespace();
 616         if (ACPI_FAILURE(status)) {
 617                 ACPI_EXCEPTION((AE_INFO, status,
 618                                 "While loading namespace from ACPI tables"));
 619         }
 620
 621         return_ACPI_STATUS(status);
 622 }
 623
 624 ACPI_EXPORT_SYMBOL(acpi_load_tables)