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: Install the table into the global data structures.
 128  *
 129  ******************************************************************************/
 130
 131 acpi_status
 132 acpi_tb_install_table (
 133         struct acpi_table_desc          *table_info)
 134 {
 135         acpi_status                     status;
 136
 137
 138         ACPI_FUNCTION_TRACE ("tb_install_table");
 139
 140
 141         /* Lock tables while installing */
 142
 143         status = acpi_ut_acquire_mutex (ACPI_MTX_TABLES);
 144         if (ACPI_FAILURE (status)) {
 145                 ACPI_REPORT_ERROR (("Could not acquire table mutex, %s\n",
 146                         acpi_format_exception (status)));
 147                 return_ACPI_STATUS (status);
 148         }
 149
 150         /*
 151          * Ignore a table that is already installed. For example, some BIOS
 152          * ASL code will repeatedly attempt to load the same SSDT.
 153          */
 154         status = acpi_tb_is_table_installed (table_info);
 155         if (ACPI_FAILURE (status)) {
 156                 goto unlock_and_exit;
 157         }
 158
 159         /* Install the table into the global data structure */
 160
 161         status = acpi_tb_init_table_descriptor (table_info->type, table_info);
 162         if (ACPI_FAILURE (status)) {
 163                 ACPI_REPORT_ERROR (("Could not install table [%4.4s], %s\n",
 164                         table_info->pointer->signature, acpi_format_exception (status)));
 165         }
 166
 167         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "%s located at %p\n",
 168                 acpi_gbl_table_data[table_info->type].name, table_info->pointer));
 169
 170
 171 unlock_and_exit:
 172         (void) acpi_ut_release_mutex (ACPI_MTX_TABLES);
 173         return_ACPI_STATUS (status);
 174 }
 175
 176
 177 /*******************************************************************************
 178  *
 179  * FUNCTION:    acpi_tb_recognize_table
 180  *
 181  * PARAMETERS:  table_info          - Return value from acpi_tb_get_table_body
 182  *              search_type         - Table type to match (primary/secondary)
 183  *
 184  * RETURN:      Status
 185  *
 186  * DESCRIPTION: Check a table signature for a match against known table types
 187  *
 188  * NOTE:  All table pointers are validated as follows:
 189  *          1) Table pointer must point to valid physical memory
 190  *          2) Signature must be 4 ASCII chars, even if we don't recognize the
 191  *             name
 192  *          3) Table must be readable for length specified in the header
 193  *          4) Table checksum must be valid (with the exception of the FACS
 194  *             which has no checksum for some odd reason)
 195  *
 196  ******************************************************************************/
 197
 198 acpi_status
 199 acpi_tb_recognize_table (
 200         struct acpi_table_desc          *table_info,
 201         u8                              search_type)
 202 {
 203         struct acpi_table_header        *table_header;
 204         acpi_status                     status;
 205
 206
 207         ACPI_FUNCTION_TRACE ("tb_recognize_table");
 208
 209
 210         /* Ensure that we have a valid table pointer */
 211
 212         table_header = (struct acpi_table_header *) table_info->pointer;
 213         if (!table_header) {
 214                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 215         }
 216
 217         /*
 218          * We only "recognize" a limited number of ACPI tables -- namely, the
 219          * ones that are used by the subsystem (DSDT, FADT, etc.)
 220          *
 221          * An AE_TABLE_NOT_SUPPORTED means that the table was not recognized.
 222          * This can be any one of many valid ACPI tables, it just isn't one of
 223          * the tables that is consumed by the core subsystem
 224          */
 225         status = acpi_tb_match_signature (table_header->signature,
 226                          table_info, search_type);
 227         if (ACPI_FAILURE (status)) {
 228                 return_ACPI_STATUS (status);
 229         }
 230
 231         status = acpi_tb_validate_table_header (table_header);
 232         if (ACPI_FAILURE (status)) {
 233                 return_ACPI_STATUS (status);
 234         }
 235
 236         /* Return the table type and length via the info struct */
 237
 238         table_info->length = (acpi_size) table_header->length;
 239
 240         return_ACPI_STATUS (status);
 241 }
 242
 243
 244 /*******************************************************************************
 245  *
 246  * FUNCTION:    acpi_tb_init_table_descriptor
 247  *
 248  * PARAMETERS:  table_type          - The type of the table
 249  *              table_info          - A table info struct
 250  *
 251  * RETURN:      None.
 252  *
 253  * DESCRIPTION: Install a table into the global data structs.
 254  *
 255  ******************************************************************************/
 256
 257 acpi_status
 258 acpi_tb_init_table_descriptor (
 259         acpi_table_type                 table_type,
 260         struct acpi_table_desc          *table_info)
 261 {
 262         struct acpi_table_list          *list_head;
 263         struct acpi_table_desc          *table_desc;
 264         acpi_status                     status;
 265
 266
 267         ACPI_FUNCTION_TRACE_U32 ("tb_init_table_descriptor", table_type);
 268
 269
 270         /* Allocate a descriptor for this table */
 271
 272         table_desc = ACPI_MEM_CALLOCATE (sizeof (struct acpi_table_desc));
 273         if (!table_desc) {
 274                 return_ACPI_STATUS (AE_NO_MEMORY);
 275         }
 276
 277         /* Get a new owner ID for the table */
 278
 279         status = acpi_ut_allocate_owner_id (&table_desc->owner_id);
 280         if (ACPI_FAILURE (status)) {
 281                 return_ACPI_STATUS (status);
 282         }
 283
 284         /* Install the table into the global data structure */
 285
 286         list_head = &acpi_gbl_table_lists[table_type];
 287
 288         /*
 289          * Two major types of tables:  1) Only one instance is allowed.  This
 290          * includes most ACPI tables such as the DSDT.  2) Multiple instances of
 291          * the table are allowed.  This includes SSDT and PSDTs.
 292          */
 293         if (ACPI_IS_SINGLE_TABLE (acpi_gbl_table_data[table_type].flags)) {
 294                 /*
 295                  * Only one table allowed, and a table has alread been installed
 296                  * at this location, so return an error.
 297                  */
 298                 if (list_head->next) {
 299                         ACPI_MEM_FREE (table_desc);
 300                         return_ACPI_STATUS (AE_ALREADY_EXISTS);
 301                 }
 302
 303                 table_desc->next = list_head->next;
 304                 list_head->next = table_desc;
 305
 306                 if (table_desc->next) {
 307                         table_desc->next->prev = table_desc;
 308                 }
 309
 310                 list_head->count++;
 311         }
 312         else {
 313                 /*
 314                  * Link the new table in to the list of tables of this type.
 315                  * Insert at the end of the list, order IS IMPORTANT.
 316                  *
 317                  * table_desc->Prev & Next are already NULL from calloc()
 318                  */
 319                 list_head->count++;
 320
 321                 if (!list_head->next) {
 322                         list_head->next = table_desc;
 323                 }
 324                 else {
 325                         table_desc->next = list_head->next;
 326
 327                         while (table_desc->next->next) {
 328                                 table_desc->next = table_desc->next->next;
 329                         }
 330
 331                         table_desc->next->next = table_desc;
 332                         table_desc->prev = table_desc->next;
 333                         table_desc->next = NULL;
 334                 }
 335         }
 336
 337         /* Finish initialization of the table descriptor */
 338
 339         table_desc->type                = (u8) table_type;
 340         table_desc->pointer             = table_info->pointer;
 341         table_desc->length              = table_info->length;
 342         table_desc->allocation          = table_info->allocation;
 343         table_desc->aml_start           = (u8 *) (table_desc->pointer + 1),
 344         table_desc->aml_length          = (u32) (table_desc->length -
 345                          (u32) sizeof (struct acpi_table_header));
 346         table_desc->loaded_into_namespace = FALSE;
 347
 348         /*
 349          * Set the appropriate global pointer (if there is one) to point to the
 350          * newly installed table
 351          */
 352         if (acpi_gbl_table_data[table_type].global_ptr) {
 353                 *(acpi_gbl_table_data[table_type].global_ptr) = table_info->pointer;
 354         }
 355
 356         /* Return Data */
 357
 358         table_info->owner_id        = table_desc->owner_id;
 359         table_info->installed_desc  = table_desc;
 360
 361         return_ACPI_STATUS (AE_OK);
 362 }
 363
 364
 365 /*******************************************************************************
 366  *
 367  * FUNCTION:    acpi_tb_delete_all_tables
 368  *
 369  * PARAMETERS:  None.
 370  *
 371  * RETURN:      None.
 372  *
 373  * DESCRIPTION: Delete all internal ACPI tables
 374  *
 375  ******************************************************************************/
 376
 377 void
 378 acpi_tb_delete_all_tables (
 379         void)
 380 {
 381         acpi_table_type                 type;
 382
 383
 384         /*
 385          * Free memory allocated for ACPI tables
 386          * Memory can either be mapped or allocated
 387          */
 388         for (type = 0; type < NUM_ACPI_TABLE_TYPES; type++) {
 389                 acpi_tb_delete_tables_by_type (type);
 390         }
 391 }
 392
 393
 394 /*******************************************************************************
 395  *
 396  * FUNCTION:    acpi_tb_delete_tables_by_type
 397  *
 398  * PARAMETERS:  Type                - The table type to be deleted
 399  *
 400  * RETURN:      None.
 401  *
 402  * DESCRIPTION: Delete an internal ACPI table
 403  *              Locks the ACPI table mutex
 404  *
 405  ******************************************************************************/
 406
 407 void
 408 acpi_tb_delete_tables_by_type (
 409         acpi_table_type                 type)
 410 {
 411         struct acpi_table_desc          *table_desc;
 412         u32                             count;
 413         u32                             i;
 414
 415
 416         ACPI_FUNCTION_TRACE_U32 ("tb_delete_tables_by_type", type);
 417
 418
 419         if (type > ACPI_TABLE_MAX) {
 420                 return_VOID;
 421         }
 422
 423         if (ACPI_FAILURE (acpi_ut_acquire_mutex (ACPI_MTX_TABLES))) {
 424                 return;
 425         }
 426
 427         /* Clear the appropriate "typed" global table pointer */
 428
 429         switch (type) {
 430         case ACPI_TABLE_RSDP:
 431                 acpi_gbl_RSDP = NULL;
 432                 break;
 433
 434         case ACPI_TABLE_DSDT:
 435                 acpi_gbl_DSDT = NULL;
 436                 break;
 437
 438         case ACPI_TABLE_FADT:
 439                 acpi_gbl_FADT = NULL;
 440                 break;
 441
 442         case ACPI_TABLE_FACS:
 443                 acpi_gbl_FACS = NULL;
 444                 break;
 445
 446         case ACPI_TABLE_XSDT:
 447                 acpi_gbl_XSDT = NULL;
 448                 break;
 449
 450         case ACPI_TABLE_SSDT:
 451         case ACPI_TABLE_PSDT:
 452         default:
 453                 break;
 454         }
 455
 456         /*
 457          * Free the table
 458          * 1) Get the head of the list
 459          */
 460         table_desc = acpi_gbl_table_lists[type].next;
 461         count     = acpi_gbl_table_lists[type].count;
 462
 463         /*
 464          * 2) Walk the entire list, deleting both the allocated tables
 465          *    and the table descriptors
 466          */
 467         for (i = 0; i < count; i++) {
 468                 table_desc = acpi_tb_uninstall_table (table_desc);
 469         }
 470
 471         (void) acpi_ut_release_mutex (ACPI_MTX_TABLES);
 472         return_VOID;
 473 }
 474
 475
 476 /*******************************************************************************
 477  *
 478  * FUNCTION:    acpi_tb_delete_single_table
 479  *
 480  * PARAMETERS:  table_info          - A table info struct
 481  *
 482  * RETURN:      None.
 483  *
 484  * DESCRIPTION: Low-level free for a single ACPI table.  Handles cases where
 485  *              the table was allocated a buffer or was mapped.
 486  *
 487  ******************************************************************************/
 488
 489 void
 490 acpi_tb_delete_single_table (
 491         struct acpi_table_desc          *table_desc)
 492 {
 493
 494         /* Must have a valid table descriptor and pointer */
 495
 496         if ((!table_desc) ||
 497                  (!table_desc->pointer)) {
 498                 return;
 499         }
 500
 501         /* Valid table, determine type of memory allocation */
 502
 503         switch (table_desc->allocation) {
 504         case ACPI_MEM_NOT_ALLOCATED:
 505                 break;
 506
 507         case ACPI_MEM_ALLOCATED:
 508
 509                 ACPI_MEM_FREE (table_desc->pointer);
 510                 break;
 511
 512         case ACPI_MEM_MAPPED:
 513
 514                 acpi_os_unmap_memory (table_desc->pointer, table_desc->length);
 515                 break;
 516
 517         default:
 518                 break;
 519         }
 520 }
 521
 522
 523 /*******************************************************************************
 524  *
 525  * FUNCTION:    acpi_tb_uninstall_table
 526  *
 527  * PARAMETERS:  table_info          - A table info struct
 528  *
 529  * RETURN:      Pointer to the next table in the list (of same type)
 530  *
 531  * DESCRIPTION: Free the memory associated with an internal ACPI table that
 532  *              is either installed or has never been installed.
 533  *              Table mutex should be locked.
 534  *
 535  ******************************************************************************/
 536
 537 struct acpi_table_desc *
 538 acpi_tb_uninstall_table (
 539         struct acpi_table_desc          *table_desc)
 540 {
 541         struct acpi_table_desc          *next_desc;
 542
 543
 544         ACPI_FUNCTION_TRACE_PTR ("tb_uninstall_table", table_desc);
 545
 546
 547         if (!table_desc) {
 548                 return_PTR (NULL);
 549         }
 550
 551         /* Unlink the descriptor from the doubly linked list */
 552
 553         if (table_desc->prev) {
 554                 table_desc->prev->next = table_desc->next;
 555         }
 556         else {
 557                 /* Is first on list, update list head */
 558
 559                 acpi_gbl_table_lists[table_desc->type].next = table_desc->next;
 560         }
 561
 562         if (table_desc->next) {
 563                 table_desc->next->prev = table_desc->prev;
 564         }
 565
 566         /* Free the memory allocated for the table itself */
 567
 568         acpi_tb_delete_single_table (table_desc);
 569
 570         /* Free the table descriptor */
 571
 572         next_desc = table_desc->next;
 573         ACPI_MEM_FREE (table_desc);
 574
 575         /* Return pointer to the next descriptor */
 576
 577         return_PTR (next_desc);
 578 }
 579
 580