drivers/acpi/tables/tbinstal.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbinstal - ACPI table installation and removal
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, 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
  45 #include <acpi/acpi.h>
  46 #include <acpi/actables.h>
  47
  48
  49 #define _COMPONENT          ACPI_TABLES
  50          ACPI_MODULE_NAME    ("tbinstal")
  51
  52 /* Local prototypes */
  53
  54 static acpi_status
  55 acpi_tb_match_signature (
  56         char                            *signature,
  57         struct acpi_table_desc          *table_info,
  58         u8                              search_type);
  59
  60
  61 /*******************************************************************************
  62  *
  63  * FUNCTION:    acpi_tb_match_signature
  64  *
  65  * PARAMETERS:  Signature           - Table signature to match
  66  *              table_info          - Return data
  67  *              search_type         - Table type to match (primary/secondary)
  68  *
  69  * RETURN:      Status
  70  *
  71  * DESCRIPTION: Compare signature against the list of "ACPI-subsystem-owned"
  72  *              tables (DSDT/FADT/SSDT, etc.) Returns the table_type_iD on match.
  73  *
  74  ******************************************************************************/
  75
  76 static acpi_status
  77 acpi_tb_match_signature (
  78         char                            *signature,
  79         struct acpi_table_desc          *table_info,
  80         u8                              search_type)
  81 {
  82         acpi_native_uint                i;
  83
  84
  85         ACPI_FUNCTION_TRACE ("tb_match_signature");
  86
  87
  88         /* Search for a signature match among the known table types */
  89
  90         for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
  91                 if (!(acpi_gbl_table_data[i].flags & search_type)) {
  92                         continue;
  93                 }
  94
  95                 if (!ACPI_STRNCMP (signature, acpi_gbl_table_data[i].signature,
  96                                    acpi_gbl_table_data[i].sig_length)) {
  97                         /* Found a signature match, return index if requested */
  98
  99                         if (table_info) {
 100                                 table_info->type = (u8) i;
 101                         }
 102
 103                         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 104                                 "Table [%4.4s] is an ACPI table consumed by the core subsystem\n",
 105                                 (char *) acpi_gbl_table_data[i].signature));
 106
 107                         return_ACPI_STATUS (AE_OK);
 108                 }
 109         }
 110
 111         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 112                 "Table [%4.4s] is not an ACPI table consumed by the core subsystem - ignored\n",
 113                 (char *) signature));
 114
 115         return_ACPI_STATUS (AE_TABLE_NOT_SUPPORTED);
 116 }
 117
 118
 119 /*******************************************************************************
 120  *
 121  * FUNCTION:    acpi_tb_install_table
 122  *
 123  * PARAMETERS:  table_info          - Return value from acpi_tb_get_table_body
 124  *
 125  * RETURN:      Status
 126  *
 127  * DESCRIPTION: Load and validate all tables other than the RSDT.  The RSDT must
 128  *              already be loaded and validated.
 129  *              Install the table into the global data structs.
 130  *
 131  ******************************************************************************/
 132
 133 acpi_status
 134 acpi_tb_install_table (
 135         struct acpi_table_desc          *table_info)
 136 {
 137         acpi_status                     status;
 138
 139         ACPI_FUNCTION_TRACE ("tb_install_table");
 140
 141
 142         /* Lock tables while installing */
 143
 144         status = acpi_ut_acquire_mutex (ACPI_MTX_TABLES);
 145         if (ACPI_FAILURE (status)) {
 146                 ACPI_REPORT_ERROR (("Could not acquire table mutex for [%4.4s], %s\n",
 147                         table_info->pointer->signature, acpi_format_exception (status)));
 148                 return_ACPI_STATUS (status);
 149         }
 150
 151         /* Install the table into the global data structure */
 152
 153         status = acpi_tb_init_table_descriptor (table_info->type, table_info);
 154         if (ACPI_FAILURE (status)) {
 155                 ACPI_REPORT_ERROR (("Could not install ACPI table [%4.4s], %s\n",
 156                         table_info->pointer->signature, acpi_format_exception (status)));
 157         }
 158
 159         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "%s located at %p\n",
 160                 acpi_gbl_table_data[table_info->type].name, table_info->pointer));
 161
 162         (void) acpi_ut_release_mutex (ACPI_MTX_TABLES);
 163         return_ACPI_STATUS (status);
 164 }
 165
 166
 167 /*******************************************************************************
 168  *
 169  * FUNCTION:    acpi_tb_recognize_table
 170  *
 171  * PARAMETERS:  table_info          - Return value from acpi_tb_get_table_body
 172  *              search_type         - Table type to match (primary/secondary)
 173  *
 174  * RETURN:      Status
 175  *
 176  * DESCRIPTION: Check a table signature for a match against known table types
 177  *
 178  * NOTE:  All table pointers are validated as follows:
 179  *          1) Table pointer must point to valid physical memory
 180  *          2) Signature must be 4 ASCII chars, even if we don't recognize the
 181  *             name
 182  *          3) Table must be readable for length specified in the header
 183  *          4) Table checksum must be valid (with the exception of the FACS
 184  *             which has no checksum for some odd reason)
 185  *
 186  ******************************************************************************/
 187
 188 acpi_status
 189 acpi_tb_recognize_table (
 190         struct acpi_table_desc          *table_info,
 191         u8                              search_type)
 192 {
 193         struct acpi_table_header        *table_header;
 194         acpi_status                     status;
 195
 196
 197         ACPI_FUNCTION_TRACE ("tb_recognize_table");
 198
 199
 200         /* Ensure that we have a valid table pointer */
 201
 202         table_header = (struct acpi_table_header *) table_info->pointer;
 203         if (!table_header) {
 204                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 205         }
 206
 207         /*
 208          * We only "recognize" a limited number of ACPI tables -- namely, the
 209          * ones that are used by the subsystem (DSDT, FADT, etc.)
 210          *
 211          * An AE_TABLE_NOT_SUPPORTED means that the table was not recognized.
 212          * This can be any one of many valid ACPI tables, it just isn't one of
 213          * the tables that is consumed by the core subsystem
 214          */
 215         status = acpi_tb_match_signature (table_header->signature,
 216                          table_info, search_type);
 217         if (ACPI_FAILURE (status)) {
 218                 return_ACPI_STATUS (status);
 219         }
 220
 221         status = acpi_tb_validate_table_header (table_header);
 222         if (ACPI_FAILURE (status)) {
 223                 return_ACPI_STATUS (status);
 224         }
 225
 226         /* Return the table type and length via the info struct */
 227
 228         table_info->length = (acpi_size) table_header->length;
 229
 230         return_ACPI_STATUS (status);
 231 }
 232
 233
 234 /*******************************************************************************
 235  *
 236  * FUNCTION:    acpi_tb_init_table_descriptor
 237  *
 238  * PARAMETERS:  table_type          - The type of the table
 239  *              table_info          - A table info struct
 240  *
 241  * RETURN:      None.
 242  *
 243  * DESCRIPTION: Install a table into the global data structs.
 244  *
 245  ******************************************************************************/
 246
 247 acpi_status
 248 acpi_tb_init_table_descriptor (
 249         acpi_table_type                 table_type,
 250         struct acpi_table_desc          *table_info)
 251 {
 252         struct acpi_table_list          *list_head;
 253         struct acpi_table_desc          *table_desc;
 254
 255
 256         ACPI_FUNCTION_TRACE_U32 ("tb_init_table_descriptor", table_type);
 257
 258
 259         /* Allocate a descriptor for this table */
 260
 261         table_desc = ACPI_MEM_CALLOCATE (sizeof (struct acpi_table_desc));
 262         if (!table_desc) {
 263                 return_ACPI_STATUS (AE_NO_MEMORY);
 264         }
 265
 266         /* Install the table into the global data structure */
 267
 268         list_head = &acpi_gbl_table_lists[table_type];
 269
 270         /*
 271          * Two major types of tables:  1) Only one instance is allowed.  This
 272          * includes most ACPI tables such as the DSDT.  2) Multiple instances of
 273          * the table are allowed.  This includes SSDT and PSDTs.
 274          */
 275         if (ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags)) {
 276                 /*
 277                  * Only one table allowed, and a table has alread been installed
 278                  * at this location, so return an error.
 279                  */
 280                 if (list_head->next) {
 281                         ACPI_MEM_FREE (table_desc);
 282                         return_ACPI_STATUS (AE_ALREADY_EXISTS);
 283                 }
 284
 285                 table_desc->next = list_head->next;
 286                 list_head->next = table_desc;
 287
 288                 if (table_desc->next) {
 289                         table_desc->next->prev = table_desc;
 290                 }
 291
 292                 list_head->count++;
 293         }
 294         else {
 295                 /*
 296                  * Link the new table in to the list of tables of this type.
 297                  * Insert at the end of the list, order IS IMPORTANT.
 298                  *
 299                  * table_desc->Prev & Next are already NULL from calloc()
 300                  */
 301                 list_head->count++;
 302
 303                 if (!list_head->next) {
 304                         list_head->next = table_desc;
 305                 }
 306                 else {
 307                         table_desc->next = list_head->next;
 308
 309                         while (table_desc->next->next) {
 310                                 table_desc->next = table_desc->next->next;
 311                         }
 312
 313                         table_desc->next->next = table_desc;
 314                         table_desc->prev = table_desc->next;
 315                         table_desc->next = NULL;
 316                 }
 317         }
 318
 319         /* Finish initialization of the table descriptor */
 320
 321         table_desc->type                = (u8) table_type;
 322         table_desc->pointer             = table_info->pointer;
 323         table_desc->length              = table_info->length;
 324         table_desc->allocation          = table_info->allocation;
 325         table_desc->aml_start           = (u8 *) (table_desc->pointer + 1),
 326         table_desc->aml_length          = (u32) (table_desc->length -
 327                          (u32) sizeof (struct acpi_table_header));
 328         table_desc->table_id            = acpi_ut_allocate_owner_id (
 329                          ACPI_OWNER_TYPE_TABLE);
 330         table_desc->loaded_into_namespace = FALSE;
 331
 332         /*
 333          * Set the appropriate global pointer (if there is one) to point to the
 334          * newly installed table
 335          */
 336         if (acpi_gbl_table_data[table_type].global_ptr) {
 337                 *(acpi_gbl_table_data[table_type].global_ptr) = table_info->pointer;
 338         }
 339
 340         /* Return Data */
 341
 342         table_info->table_id        = table_desc->table_id;
 343         table_info->installed_desc  = table_desc;
 344
 345         return_ACPI_STATUS (AE_OK);
 346 }
 347
 348
 349 /*******************************************************************************
 350  *
 351  * FUNCTION:    acpi_tb_delete_all_tables
 352  *
 353  * PARAMETERS:  None.
 354  *
 355  * RETURN:      None.
 356  *
 357  * DESCRIPTION: Delete all internal ACPI tables
 358  *
 359  ******************************************************************************/
 360
 361 void
 362 acpi_tb_delete_all_tables (
 363         void)
 364 {
 365         acpi_table_type                 type;
 366
 367
 368         /*
 369          * Free memory allocated for ACPI tables
 370          * Memory can either be mapped or allocated
 371          */
 372         for (type = 0; type < NUM_ACPI_TABLE_TYPES; type++) {
 373                 acpi_tb_delete_tables_by_type (type);
 374         }
 375 }
 376
 377
 378 /*******************************************************************************
 379  *
 380  * FUNCTION:    acpi_tb_delete_tables_by_type
 381  *
 382  * PARAMETERS:  Type                - The table type to be deleted
 383  *
 384  * RETURN:      None.
 385  *
 386  * DESCRIPTION: Delete an internal ACPI table
 387  *              Locks the ACPI table mutex
 388  *
 389  ******************************************************************************/
 390
 391 void
 392 acpi_tb_delete_tables_by_type (
 393         acpi_table_type                 type)
 394 {
 395         struct acpi_table_desc          *table_desc;
 396         u32                             count;
 397         u32                             i;
 398
 399
 400         ACPI_FUNCTION_TRACE_U32 ("tb_delete_tables_by_type", type);
 401
 402
 403         if (type > ACPI_TABLE_MAX) {
 404                 return_VOID;
 405         }
 406
 407         if (ACPI_FAILURE (acpi_ut_acquire_mutex (ACPI_MTX_TABLES))) {
 408                 return;
 409         }
 410
 411         /* Clear the appropriate "typed" global table pointer */
 412
 413         switch (type) {
 414         case ACPI_TABLE_RSDP:
 415                 acpi_gbl_RSDP = NULL;
 416                 break;
 417
 418         case ACPI_TABLE_DSDT:
 419                 acpi_gbl_DSDT = NULL;
 420                 break;
 421
 422         case ACPI_TABLE_FADT:
 423                 acpi_gbl_FADT = NULL;
 424                 break;
 425
 426         case ACPI_TABLE_FACS:
 427                 acpi_gbl_FACS = NULL;
 428                 break;
 429
 430         case ACPI_TABLE_XSDT:
 431                 acpi_gbl_XSDT = NULL;
 432                 break;
 433
 434         case ACPI_TABLE_SSDT:
 435         case ACPI_TABLE_PSDT:
 436         default:
 437                 break;
 438         }
 439
 440         /*
 441          * Free the table
 442          * 1) Get the head of the list
 443          */
 444         table_desc = acpi_gbl_table_lists[type].next;
 445         count     = acpi_gbl_table_lists[type].count;
 446
 447         /*
 448          * 2) Walk the entire list, deleting both the allocated tables
 449          *    and the table descriptors
 450          */
 451         for (i = 0; i < count; i++) {
 452                 table_desc = acpi_tb_uninstall_table (table_desc);
 453         }
 454
 455         (void) acpi_ut_release_mutex (ACPI_MTX_TABLES);
 456         return_VOID;
 457 }
 458
 459
 460 /*******************************************************************************
 461  *
 462  * FUNCTION:    acpi_tb_delete_single_table
 463  *
 464  * PARAMETERS:  table_info          - A table info struct
 465  *
 466  * RETURN:      None.
 467  *
 468  * DESCRIPTION: Low-level free for a single ACPI table.  Handles cases where
 469  *              the table was allocated a buffer or was mapped.
 470  *
 471  ******************************************************************************/
 472
 473 void
 474 acpi_tb_delete_single_table (
 475         struct acpi_table_desc          *table_desc)
 476 {
 477
 478         /* Must have a valid table descriptor and pointer */
 479
 480         if ((!table_desc) ||
 481                  (!table_desc->pointer)) {
 482                 return;
 483         }
 484
 485         /* Valid table, determine type of memory allocation */
 486
 487         switch (table_desc->allocation) {
 488         case ACPI_MEM_NOT_ALLOCATED:
 489                 break;
 490
 491         case ACPI_MEM_ALLOCATED:
 492
 493                 ACPI_MEM_FREE (table_desc->pointer);
 494                 break;
 495
 496         case ACPI_MEM_MAPPED:
 497
 498                 acpi_os_unmap_memory (table_desc->pointer, table_desc->length);
 499                 break;
 500
 501         default:
 502                 break;
 503         }
 504 }
 505
 506
 507 /*******************************************************************************
 508  *
 509  * FUNCTION:    acpi_tb_uninstall_table
 510  *
 511  * PARAMETERS:  table_info          - A table info struct
 512  *
 513  * RETURN:      Pointer to the next table in the list (of same type)
 514  *
 515  * DESCRIPTION: Free the memory associated with an internal ACPI table that
 516  *              is either installed or has never been installed.
 517  *              Table mutex should be locked.
 518  *
 519  ******************************************************************************/
 520
 521 struct acpi_table_desc *
 522 acpi_tb_uninstall_table (
 523         struct acpi_table_desc          *table_desc)
 524 {
 525         struct acpi_table_desc          *next_desc;
 526
 527
 528         ACPI_FUNCTION_TRACE_PTR ("tb_uninstall_table", table_desc);
 529
 530
 531         if (!table_desc) {
 532                 return_PTR (NULL);
 533         }
 534
 535         /* Unlink the descriptor from the doubly linked list */
 536
 537         if (table_desc->prev) {
 538                 table_desc->prev->next = table_desc->next;
 539         }
 540         else {
 541                 /* Is first on list, update list head */
 542
 543                 acpi_gbl_table_lists[table_desc->type].next = table_desc->next;
 544         }
 545
 546         if (table_desc->next) {
 547                 table_desc->next->prev = table_desc->prev;
 548         }
 549
 550         /* Free the memory allocated for the table itself */
 551
 552         acpi_tb_delete_single_table (table_desc);
 553
 554         /* Free the table descriptor */
 555
 556         next_desc = table_desc->next;
 557         ACPI_MEM_FREE (table_desc);
 558
 559         /* Return pointer to the next descriptor */
 560
 561         return_PTR (next_desc);
 562 }
 563
 564