git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/tables/tbinstal.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbinstal - ACPI table installation and removal
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2006, R. Byron Moore
   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 <acpi/actables.h>
  46
  47 #define _COMPONENT          ACPI_TABLES
  48 ACPI_MODULE_NAME("tbinstal")
  49
  50 /* Local prototypes */
  51 static acpi_status
  52 acpi_tb_match_signature(char *signature,
  53                         struct acpi_table_desc *table_info, u8 search_type);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_tb_match_signature
  58  *
  59  * PARAMETERS:  Signature           - Table signature to match
  60  *              table_info          - Return data
  61  *              search_type         - Table type to match (primary/secondary)
  62  *
  63  * RETURN:      Status
  64  *
  65  * DESCRIPTION: Compare signature against the list of "ACPI-subsystem-owned"
  66  *              tables (DSDT/FADT/SSDT, etc.) Returns the table_type_iD on match.
  67  *
  68  ******************************************************************************/
  69
  70 static acpi_status
  71 acpi_tb_match_signature(char *signature,
  72                         struct acpi_table_desc *table_info, u8 search_type)
  73 {
  74         acpi_native_uint i;
  75
  76         ACPI_FUNCTION_TRACE("tb_match_signature");
  77
  78         /* Search for a signature match among the known table types */
  79
  80         for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
  81                 if (!(acpi_gbl_table_data[i].flags & search_type)) {
  82                         continue;
  83                 }
  84
  85                 if (!ACPI_STRNCMP(signature, acpi_gbl_table_data[i].signature,
  86                                   acpi_gbl_table_data[i].sig_length)) {
  87                         /* Found a signature match, return index if requested */
  88
  89                         if (table_info) {
  90                                 table_info->type = (u8) i;
  91                         }
  92
  93                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  94                                           "Table [%4.4s] is an ACPI table consumed by the core subsystem\n",
  95                                           (char *)acpi_gbl_table_data[i].
  96                                           signature));
  97
  98                         return_ACPI_STATUS(AE_OK);
  99                 }
 100         }
 101
 102         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 103                           "Table [%4.4s] is not an ACPI table consumed by the core subsystem - ignored\n",
 104                           (char *)signature));
 105
 106         return_ACPI_STATUS(AE_TABLE_NOT_SUPPORTED);
 107 }
 108
 109 /*******************************************************************************
 110  *
 111  * FUNCTION:    acpi_tb_install_table
 112  *
 113  * PARAMETERS:  table_info          - Return value from acpi_tb_get_table_body
 114  *
 115  * RETURN:      Status
 116  *
 117  * DESCRIPTION: Install the table into the global data structures.
 118  *
 119  ******************************************************************************/
 120
 121 acpi_status acpi_tb_install_table(struct acpi_table_desc *table_info)
 122 {
 123         acpi_status status;
 124
 125         ACPI_FUNCTION_TRACE("tb_install_table");
 126
 127         /* Lock tables while installing */
 128
 129         status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 130         if (ACPI_FAILURE(status)) {
 131                 ACPI_REPORT_ERROR(("Could not acquire table mutex, %s\n",
 132                                    acpi_format_exception(status)));
 133                 return_ACPI_STATUS(status);
 134         }
 135
 136         /*
 137          * Ignore a table that is already installed. For example, some BIOS
 138          * ASL code will repeatedly attempt to load the same SSDT.
 139          */
 140         status = acpi_tb_is_table_installed(table_info);
 141         if (ACPI_FAILURE(status)) {
 142                 goto unlock_and_exit;
 143         }
 144
 145         /* Install the table into the global data structure */
 146
 147         status = acpi_tb_init_table_descriptor(table_info->type, table_info);
 148         if (ACPI_FAILURE(status)) {
 149                 ACPI_REPORT_ERROR(("Could not install table [%4.4s], %s\n",
 150                                    table_info->pointer->signature,
 151                                    acpi_format_exception(status)));
 152         }
 153
 154         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s located at %p\n",
 155                           acpi_gbl_table_data[table_info->type].name,
 156                           table_info->pointer));
 157
 158       unlock_and_exit:
 159         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 160         return_ACPI_STATUS(status);
 161 }
 162
 163 /*******************************************************************************
 164  *
 165  * FUNCTION:    acpi_tb_recognize_table
 166  *
 167  * PARAMETERS:  table_info          - Return value from acpi_tb_get_table_body
 168  *              search_type         - Table type to match (primary/secondary)
 169  *
 170  * RETURN:      Status
 171  *
 172  * DESCRIPTION: Check a table signature for a match against known table types
 173  *
 174  * NOTE:  All table pointers are validated as follows:
 175  *          1) Table pointer must point to valid physical memory
 176  *          2) Signature must be 4 ASCII chars, even if we don't recognize the
 177  *             name
 178  *          3) Table must be readable for length specified in the header
 179  *          4) Table checksum must be valid (with the exception of the FACS
 180  *             which has no checksum for some odd reason)
 181  *
 182  ******************************************************************************/
 183
 184 acpi_status
 185 acpi_tb_recognize_table(struct acpi_table_desc *table_info, u8 search_type)
 186 {
 187         struct acpi_table_header *table_header;
 188         acpi_status status;
 189
 190         ACPI_FUNCTION_TRACE("tb_recognize_table");
 191
 192         /* Ensure that we have a valid table pointer */
 193
 194         table_header = (struct acpi_table_header *)table_info->pointer;
 195         if (!table_header) {
 196                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 197         }
 198
 199         /*
 200          * We only "recognize" a limited number of ACPI tables -- namely, the
 201          * ones that are used by the subsystem (DSDT, FADT, etc.)
 202          *
 203          * An AE_TABLE_NOT_SUPPORTED means that the table was not recognized.
 204          * This can be any one of many valid ACPI tables, it just isn't one of
 205          * the tables that is consumed by the core subsystem
 206          */
 207         status = acpi_tb_match_signature(table_header->signature,
 208                                          table_info, search_type);
 209         if (ACPI_FAILURE(status)) {
 210                 return_ACPI_STATUS(status);
 211         }
 212
 213         status = acpi_tb_validate_table_header(table_header);
 214         if (ACPI_FAILURE(status)) {
 215                 return_ACPI_STATUS(status);
 216         }
 217
 218         /* Return the table type and length via the info struct */
 219
 220         table_info->length = (acpi_size) table_header->length;
 221
 222         return_ACPI_STATUS(status);
 223 }
 224
 225 /*******************************************************************************
 226  *
 227  * FUNCTION:    acpi_tb_init_table_descriptor
 228  *
 229  * PARAMETERS:  table_type          - The type of the table
 230  *              table_info          - A table info struct
 231  *
 232  * RETURN:      None.
 233  *
 234  * DESCRIPTION: Install a table into the global data structs.
 235  *
 236  ******************************************************************************/
 237
 238 acpi_status
 239 acpi_tb_init_table_descriptor(acpi_table_type table_type,
 240                               struct acpi_table_desc *table_info)
 241 {
 242         struct acpi_table_list *list_head;
 243         struct acpi_table_desc *table_desc;
 244         acpi_status status;
 245
 246         ACPI_FUNCTION_TRACE_U32("tb_init_table_descriptor", table_type);
 247
 248         /* Allocate a descriptor for this table */
 249
 250         table_desc = ACPI_MEM_CALLOCATE(sizeof(struct acpi_table_desc));
 251         if (!table_desc) {
 252                 return_ACPI_STATUS(AE_NO_MEMORY);
 253         }
 254
 255         /* Get a new owner ID for the table */
 256
 257         status = acpi_ut_allocate_owner_id(&table_desc->owner_id);
 258         if (ACPI_FAILURE(status)) {
 259                 return_ACPI_STATUS(status);
 260         }
 261
 262         /* Install the table into the global data structure */
 263
 264         list_head = &acpi_gbl_table_lists[table_type];
 265
 266         /*
 267          * Two major types of tables:  1) Only one instance is allowed.  This
 268          * includes most ACPI tables such as the DSDT.  2) Multiple instances of
 269          * the table are allowed.  This includes SSDT and PSDTs.
 270          */
 271         if (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags)) {
 272                 /*
 273                  * Only one table allowed, and a table has alread been installed
 274                  * at this location, so return an error.
 275                  */
 276                 if (list_head->next) {
 277                         ACPI_MEM_FREE(table_desc);
 278                         return_ACPI_STATUS(AE_ALREADY_EXISTS);
 279                 }
 280
 281                 table_desc->next = list_head->next;
 282                 list_head->next = table_desc;
 283
 284                 if (table_desc->next) {
 285                         table_desc->next->prev = table_desc;
 286                 }
 287
 288                 list_head->count++;
 289         } else {
 290                 /*
 291                  * Link the new table in to the list of tables of this type.
 292                  * Insert at the end of the list, order IS IMPORTANT.
 293                  *
 294                  * table_desc->Prev & Next are already NULL from calloc()
 295                  */
 296                 list_head->count++;
 297
 298                 if (!list_head->next) {
 299                         list_head->next = table_desc;
 300                 } else {
 301                         table_desc->next = list_head->next;
 302
 303                         while (table_desc->next->next) {
 304                                 table_desc->next = table_desc->next->next;
 305                         }
 306
 307                         table_desc->next->next = table_desc;
 308                         table_desc->prev = table_desc->next;
 309                         table_desc->next = NULL;
 310                 }
 311         }
 312
 313         /* Finish initialization of the table descriptor */
 314
 315         table_desc->type = (u8) table_type;
 316         table_desc->pointer = table_info->pointer;
 317         table_desc->length = table_info->length;
 318         table_desc->allocation = table_info->allocation;
 319         table_desc->aml_start = (u8 *) (table_desc->pointer + 1),
 320             table_desc->aml_length = (u32) (table_desc->length -
 321                                             (u32) sizeof(struct
 322                                                          acpi_table_header));
 323         table_desc->loaded_into_namespace = FALSE;
 324
 325         /*
 326          * Set the appropriate global pointer (if there is one) to point to the
 327          * newly installed table
 328          */
 329         if (acpi_gbl_table_data[table_type].global_ptr) {
 330                 *(acpi_gbl_table_data[table_type].global_ptr) =
 331                     table_info->pointer;
 332         }
 333
 334         /* Return Data */
 335
 336         table_info->owner_id = table_desc->owner_id;
 337         table_info->installed_desc = table_desc;
 338
 339         return_ACPI_STATUS(AE_OK);
 340 }
 341
 342 /*******************************************************************************
 343  *
 344  * FUNCTION:    acpi_tb_delete_all_tables
 345  *
 346  * PARAMETERS:  None.
 347  *
 348  * RETURN:      None.
 349  *
 350  * DESCRIPTION: Delete all internal ACPI tables
 351  *
 352  ******************************************************************************/
 353
 354 void acpi_tb_delete_all_tables(void)
 355 {
 356         acpi_table_type type;
 357
 358         /*
 359          * Free memory allocated for ACPI tables
 360          * Memory can either be mapped or allocated
 361          */
 362         for (type = 0; type < NUM_ACPI_TABLE_TYPES; type++) {
 363                 acpi_tb_delete_tables_by_type(type);
 364         }
 365 }
 366
 367 /*******************************************************************************
 368  *
 369  * FUNCTION:    acpi_tb_delete_tables_by_type
 370  *
 371  * PARAMETERS:  Type                - The table type to be deleted
 372  *
 373  * RETURN:      None.
 374  *
 375  * DESCRIPTION: Delete an internal ACPI table
 376  *              Locks the ACPI table mutex
 377  *
 378  ******************************************************************************/
 379
 380 void acpi_tb_delete_tables_by_type(acpi_table_type type)
 381 {
 382         struct acpi_table_desc *table_desc;
 383         u32 count;
 384         u32 i;
 385
 386         ACPI_FUNCTION_TRACE_U32("tb_delete_tables_by_type", type);
 387
 388         if (type > ACPI_TABLE_MAX) {
 389                 return_VOID;
 390         }
 391
 392         if (ACPI_FAILURE(acpi_ut_acquire_mutex(ACPI_MTX_TABLES))) {
 393                 return;
 394         }
 395
 396         /* Clear the appropriate "typed" global table pointer */
 397
 398         switch (type) {
 399         case ACPI_TABLE_RSDP:
 400                 acpi_gbl_RSDP = NULL;
 401                 break;
 402
 403         case ACPI_TABLE_DSDT:
 404                 acpi_gbl_DSDT = NULL;
 405                 break;
 406
 407         case ACPI_TABLE_FADT:
 408                 acpi_gbl_FADT = NULL;
 409                 break;
 410
 411         case ACPI_TABLE_FACS:
 412                 acpi_gbl_FACS = NULL;
 413                 break;
 414
 415         case ACPI_TABLE_XSDT:
 416                 acpi_gbl_XSDT = NULL;
 417                 break;
 418
 419         case ACPI_TABLE_SSDT:
 420         case ACPI_TABLE_PSDT:
 421         default:
 422                 break;
 423         }
 424
 425         /*
 426          * Free the table
 427          * 1) Get the head of the list
 428          */
 429         table_desc = acpi_gbl_table_lists[type].next;
 430         count = acpi_gbl_table_lists[type].count;
 431
 432         /*
 433          * 2) Walk the entire list, deleting both the allocated tables
 434          *    and the table descriptors
 435          */
 436         for (i = 0; i < count; i++) {
 437                 table_desc = acpi_tb_uninstall_table(table_desc);
 438         }
 439
 440         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 441         return_VOID;
 442 }
 443
 444 /*******************************************************************************
 445  *
 446  * FUNCTION:    acpi_tb_delete_single_table
 447  *
 448  * PARAMETERS:  table_info          - A table info struct
 449  *
 450  * RETURN:      None.
 451  *
 452  * DESCRIPTION: Low-level free for a single ACPI table.  Handles cases where
 453  *              the table was allocated a buffer or was mapped.
 454  *
 455  ******************************************************************************/
 456
 457 void acpi_tb_delete_single_table(struct acpi_table_desc *table_desc)
 458 {
 459
 460         /* Must have a valid table descriptor and pointer */
 461
 462         if ((!table_desc) || (!table_desc->pointer)) {
 463                 return;
 464         }
 465
 466         /* Valid table, determine type of memory allocation */
 467
 468         switch (table_desc->allocation) {
 469         case ACPI_MEM_NOT_ALLOCATED:
 470                 break;
 471
 472         case ACPI_MEM_ALLOCATED:
 473
 474                 ACPI_MEM_FREE(table_desc->pointer);
 475                 break;
 476
 477         case ACPI_MEM_MAPPED:
 478
 479                 acpi_os_unmap_memory(table_desc->pointer, table_desc->length);
 480                 break;
 481
 482         default:
 483                 break;
 484         }
 485 }
 486
 487 /*******************************************************************************
 488  *
 489  * FUNCTION:    acpi_tb_uninstall_table
 490  *
 491  * PARAMETERS:  table_info          - A table info struct
 492  *
 493  * RETURN:      Pointer to the next table in the list (of same type)
 494  *
 495  * DESCRIPTION: Free the memory associated with an internal ACPI table that
 496  *              is either installed or has never been installed.
 497  *              Table mutex should be locked.
 498  *
 499  ******************************************************************************/
 500
 501 struct acpi_table_desc *acpi_tb_uninstall_table(struct acpi_table_desc
 502                                                 *table_desc)
 503 {
 504         struct acpi_table_desc *next_desc;
 505
 506         ACPI_FUNCTION_TRACE_PTR("tb_uninstall_table", table_desc);
 507
 508         if (!table_desc) {
 509                 return_PTR(NULL);
 510         }
 511
 512         /* Unlink the descriptor from the doubly linked list */
 513
 514         if (table_desc->prev) {
 515                 table_desc->prev->next = table_desc->next;
 516         } else {
 517                 /* Is first on list, update list head */
 518
 519                 acpi_gbl_table_lists[table_desc->type].next = table_desc->next;
 520         }
 521
 522         if (table_desc->next) {
 523                 table_desc->next->prev = table_desc->prev;
 524         }
 525
 526         /* Free the memory allocated for the table itself */
 527
 528         acpi_tb_delete_single_table(table_desc);
 529
 530         /* Free the table descriptor */
 531
 532         next_desc = table_desc->next;
 533         ACPI_MEM_FREE(table_desc);
 534
 535         /* Return pointer to the next descriptor */
 536
 537         return_PTR(next_desc);
 538 }