drivers/acpi/executer/exconfig.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2008, Intel Corp.
   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/acinterp.h>
  46 #include <acpi/acnamesp.h>
  47 #include <acpi/actables.h>
  48 #include <acpi/acdispat.h>
  49
  50 #define _COMPONENT          ACPI_EXECUTER
  51 ACPI_MODULE_NAME("exconfig")
  52
  53 /* Local prototypes */
  54 static acpi_status
  55 acpi_ex_add_table(u32 table_index,
  56                   struct acpi_namespace_node *parent_node,
  57                   union acpi_operand_object **ddb_handle);
  58
  59 /*******************************************************************************
  60  *
  61  * FUNCTION:    acpi_ex_add_table
  62  *
  63  * PARAMETERS:  Table               - Pointer to raw table
  64  *              parent_node         - Where to load the table (scope)
  65  *              ddb_handle          - Where to return the table handle.
  66  *
  67  * RETURN:      Status
  68  *
  69  * DESCRIPTION: Common function to Install and Load an ACPI table with a
  70  *              returned table handle.
  71  *
  72  ******************************************************************************/
  73
  74 static acpi_status
  75 acpi_ex_add_table(u32 table_index,
  76                   struct acpi_namespace_node *parent_node,
  77                   union acpi_operand_object **ddb_handle)
  78 {
  79         acpi_status status;
  80         union acpi_operand_object *obj_desc;
  81
  82         ACPI_FUNCTION_TRACE(ex_add_table);
  83
  84         /* Create an object to be the table handle */
  85
  86         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
  87         if (!obj_desc) {
  88                 return_ACPI_STATUS(AE_NO_MEMORY);
  89         }
  90
  91         /* Init the table handle */
  92
  93         obj_desc->reference.class = ACPI_REFCLASS_TABLE;
  94         *ddb_handle = obj_desc;
  95
  96         /* Install the new table into the local data structures */
  97
  98         obj_desc->reference.value = table_index;
  99
 100         /* Add the table to the namespace */
 101
 102         status = acpi_ns_load_table(table_index, parent_node);
 103         if (ACPI_FAILURE(status)) {
 104                 acpi_ut_remove_reference(obj_desc);
 105                 *ddb_handle = NULL;
 106         }
 107
 108         return_ACPI_STATUS(status);
 109 }
 110
 111 /*******************************************************************************
 112  *
 113  * FUNCTION:    acpi_ex_load_table_op
 114  *
 115  * PARAMETERS:  walk_state          - Current state with operands
 116  *              return_desc         - Where to store the return object
 117  *
 118  * RETURN:      Status
 119  *
 120  * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
 121  *
 122  ******************************************************************************/
 123
 124 acpi_status
 125 acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
 126                       union acpi_operand_object **return_desc)
 127 {
 128         acpi_status status;
 129         union acpi_operand_object **operand = &walk_state->operands[0];
 130         struct acpi_namespace_node *parent_node;
 131         struct acpi_namespace_node *start_node;
 132         struct acpi_namespace_node *parameter_node = NULL;
 133         union acpi_operand_object *ddb_handle;
 134         struct acpi_table_header *table;
 135         u32 table_index;
 136
 137         ACPI_FUNCTION_TRACE(ex_load_table_op);
 138
 139         /* Validate lengths for the signature_string, OEMIDString, OEMtable_iD */
 140
 141         if ((operand[0]->string.length > ACPI_NAME_SIZE) ||
 142             (operand[1]->string.length > ACPI_OEM_ID_SIZE) ||
 143             (operand[2]->string.length > ACPI_OEM_TABLE_ID_SIZE)) {
 144                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 145         }
 146
 147         /* Find the ACPI table in the RSDT/XSDT */
 148
 149         status = acpi_tb_find_table(operand[0]->string.pointer,
 150                                     operand[1]->string.pointer,
 151                                     operand[2]->string.pointer, &table_index);
 152         if (ACPI_FAILURE(status)) {
 153                 if (status != AE_NOT_FOUND) {
 154                         return_ACPI_STATUS(status);
 155                 }
 156
 157                 /* Table not found, return an Integer=0 and AE_OK */
 158
 159                 ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 160                 if (!ddb_handle) {
 161                         return_ACPI_STATUS(AE_NO_MEMORY);
 162                 }
 163
 164                 ddb_handle->integer.value = 0;
 165                 *return_desc = ddb_handle;
 166
 167                 return_ACPI_STATUS(AE_OK);
 168         }
 169
 170         /* Default nodes */
 171
 172         start_node = walk_state->scope_info->scope.node;
 173         parent_node = acpi_gbl_root_node;
 174
 175         /* root_path (optional parameter) */
 176
 177         if (operand[3]->string.length > 0) {
 178                 /*
 179                  * Find the node referenced by the root_path_string. This is the
 180                  * location within the namespace where the table will be loaded.
 181                  */
 182                 status =
 183                     acpi_ns_get_node(start_node, operand[3]->string.pointer,
 184                                      ACPI_NS_SEARCH_PARENT, &parent_node);
 185                 if (ACPI_FAILURE(status)) {
 186                         return_ACPI_STATUS(status);
 187                 }
 188         }
 189
 190         /* parameter_path (optional parameter) */
 191
 192         if (operand[4]->string.length > 0) {
 193                 if ((operand[4]->string.pointer[0] != '\\') &&
 194                     (operand[4]->string.pointer[0] != '^')) {
 195                         /*
 196                          * Path is not absolute, so it will be relative to the node
 197                          * referenced by the root_path_string (or the NS root if omitted)
 198                          */
 199                         start_node = parent_node;
 200                 }
 201
 202                 /* Find the node referenced by the parameter_path_string */
 203
 204                 status =
 205                     acpi_ns_get_node(start_node, operand[4]->string.pointer,
 206                                      ACPI_NS_SEARCH_PARENT, &parameter_node);
 207                 if (ACPI_FAILURE(status)) {
 208                         return_ACPI_STATUS(status);
 209                 }
 210         }
 211
 212         /* Load the table into the namespace */
 213
 214         status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
 215         if (ACPI_FAILURE(status)) {
 216                 return_ACPI_STATUS(status);
 217         }
 218
 219         /* Parameter Data (optional) */
 220
 221         if (parameter_node) {
 222
 223                 /* Store the parameter data into the optional parameter object */
 224
 225                 status = acpi_ex_store(operand[5],
 226                                        ACPI_CAST_PTR(union acpi_operand_object,
 227                                                      parameter_node),
 228                                        walk_state);
 229                 if (ACPI_FAILURE(status)) {
 230                         (void)acpi_ex_unload_table(ddb_handle);
 231                         return_ACPI_STATUS(status);
 232                 }
 233         }
 234
 235         status = acpi_get_table_by_index(table_index, &table);
 236         if (ACPI_SUCCESS(status)) {
 237                 ACPI_INFO((AE_INFO,
 238                            "Dynamic OEM Table Load - [%.4s] OemId [%.6s] OemTableId [%.8s]",
 239                            table->signature, table->oem_id,
 240                            table->oem_table_id));
 241         }
 242
 243         /* Invoke table handler if present */
 244
 245         if (acpi_gbl_table_handler) {
 246                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 247                                              acpi_gbl_table_handler_context);
 248         }
 249
 250         *return_desc = ddb_handle;
 251         return_ACPI_STATUS(status);
 252 }
 253
 254 /*******************************************************************************
 255  *
 256  * FUNCTION:    acpi_ex_load_op
 257  *
 258  * PARAMETERS:  obj_desc        - Region or Buffer/Field where the table will be
 259  *                                obtained
 260  *              Target          - Where a handle to the table will be stored
 261  *              walk_state      - Current state
 262  *
 263  * RETURN:      Status
 264  *
 265  * DESCRIPTION: Load an ACPI table from a field or operation region
 266  *
 267  * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
 268  *       objects before this code is reached.
 269  *
 270  *       If source is an operation region, it must refer to system_memory, as
 271  *       per the ACPI specification.
 272  *
 273  ******************************************************************************/
 274
 275 acpi_status
 276 acpi_ex_load_op(union acpi_operand_object *obj_desc,
 277                 union acpi_operand_object *target,
 278                 struct acpi_walk_state *walk_state)
 279 {
 280         union acpi_operand_object *ddb_handle;
 281         struct acpi_table_header *table;
 282         struct acpi_table_desc table_desc;
 283         u32 table_index;
 284         acpi_status status;
 285         u32 length;
 286
 287         ACPI_FUNCTION_TRACE(ex_load_op);
 288
 289         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
 290
 291         /* Source Object can be either an op_region or a Buffer/Field */
 292
 293         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 294         case ACPI_TYPE_REGION:
 295
 296                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 297                                   "Load table from Region %p\n", obj_desc));
 298
 299                 /* Region must be system_memory (from ACPI spec) */
 300
 301                 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
 302                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 303                 }
 304
 305                 /*
 306                  * If the Region Address and Length have not been previously evaluated,
 307                  * evaluate them now and save the results.
 308                  */
 309                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 310                         status = acpi_ds_get_region_arguments(obj_desc);
 311                         if (ACPI_FAILURE(status)) {
 312                                 return_ACPI_STATUS(status);
 313                         }
 314                 }
 315
 316                 /*
 317                  * Map the table header and get the actual table length. The region
 318                  * length is not guaranteed to be the same as the table length.
 319                  */
 320                 table = acpi_os_map_memory(obj_desc->region.address,
 321                                            sizeof(struct acpi_table_header));
 322                 if (!table) {
 323                         return_ACPI_STATUS(AE_NO_MEMORY);
 324                 }
 325
 326                 length = table->length;
 327                 acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
 328
 329                 /* Must have at least an ACPI table header */
 330
 331                 if (length < sizeof(struct acpi_table_header)) {
 332                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 333                 }
 334
 335                 /*
 336                  * The memory region is not guaranteed to remain stable and we must
 337                  * copy the table to a local buffer. For example, the memory region
 338                  * is corrupted after suspend on some machines. Dynamically loaded
 339                  * tables are usually small, so this overhead is minimal.
 340                  */
 341
 342                 /* Allocate a buffer for the table */
 343
 344                 table_desc.pointer = ACPI_ALLOCATE(length);
 345                 if (!table_desc.pointer) {
 346                         return_ACPI_STATUS(AE_NO_MEMORY);
 347                 }
 348
 349                 /* Map the entire table and copy it */
 350
 351                 table = acpi_os_map_memory(obj_desc->region.address, length);
 352                 if (!table) {
 353                         ACPI_FREE(table_desc.pointer);
 354                         return_ACPI_STATUS(AE_NO_MEMORY);
 355                 }
 356
 357                 ACPI_MEMCPY(table_desc.pointer, table, length);
 358                 acpi_os_unmap_memory(table, length);
 359
 360                 table_desc.address = obj_desc->region.address;
 361                 break;
 362
 363         case ACPI_TYPE_BUFFER:  /* Buffer or resolved region_field */
 364
 365                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 366                                   "Load table from Buffer or Field %p\n",
 367                                   obj_desc));
 368
 369                 /* Must have at least an ACPI table header */
 370
 371                 if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
 372                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 373                 }
 374
 375                 /* Get the actual table length from the table header */
 376
 377                 table =
 378                     ACPI_CAST_PTR(struct acpi_table_header,
 379                                   obj_desc->buffer.pointer);
 380                 length = table->length;
 381
 382                 /* Table cannot extend beyond the buffer */
 383
 384                 if (length > obj_desc->buffer.length) {
 385                         return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
 386                 }
 387                 if (length < sizeof(struct acpi_table_header)) {
 388                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 389                 }
 390
 391                 /*
 392                  * Copy the table from the buffer because the buffer could be modified
 393                  * or even deleted in the future
 394                  */
 395                 table_desc.pointer = ACPI_ALLOCATE(length);
 396                 if (!table_desc.pointer) {
 397                         return_ACPI_STATUS(AE_NO_MEMORY);
 398                 }
 399
 400                 ACPI_MEMCPY(table_desc.pointer, table, length);
 401                 table_desc.address = ACPI_TO_INTEGER(table_desc.pointer);
 402                 break;
 403
 404         default:
 405                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 406         }
 407
 408         /* Validate table checksum (will not get validated in tb_add_table) */
 409
 410         status = acpi_tb_verify_checksum(table_desc.pointer, length);
 411         if (ACPI_FAILURE(status)) {
 412                 ACPI_FREE(table_desc.pointer);
 413                 return_ACPI_STATUS(status);
 414         }
 415
 416         /* Complete the table descriptor */
 417
 418         table_desc.length = length;
 419         table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;
 420
 421         /* Install the new table into the local data structures */
 422
 423         status = acpi_tb_add_table(&table_desc, &table_index);
 424         if (ACPI_FAILURE(status)) {
 425                 goto cleanup;
 426         }
 427
 428         /*
 429          * Add the table to the namespace.
 430          *
 431          * Note: Load the table objects relative to the root of the namespace.
 432          * This appears to go against the ACPI specification, but we do it for
 433          * compatibility with other ACPI implementations.
 434          */
 435         status =
 436             acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
 437         if (ACPI_FAILURE(status)) {
 438
 439                 /* On error, table_ptr was deallocated above */
 440
 441                 return_ACPI_STATUS(status);
 442         }
 443
 444         /* Store the ddb_handle into the Target operand */
 445
 446         status = acpi_ex_store(ddb_handle, target, walk_state);
 447         if (ACPI_FAILURE(status)) {
 448                 (void)acpi_ex_unload_table(ddb_handle);
 449
 450                 /* table_ptr was deallocated above */
 451
 452                 acpi_ut_remove_reference(ddb_handle);
 453                 return_ACPI_STATUS(status);
 454         }
 455
 456         /* Invoke table handler if present */
 457
 458         if (acpi_gbl_table_handler) {
 459                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD,
 460                                              table_desc.pointer,
 461                                              acpi_gbl_table_handler_context);
 462         }
 463
 464       cleanup:
 465         if (ACPI_FAILURE(status)) {
 466
 467                 /* Delete allocated table buffer */
 468
 469                 acpi_tb_delete_table(&table_desc);
 470         }
 471         return_ACPI_STATUS(status);
 472 }
 473
 474 /*******************************************************************************
 475  *
 476  * FUNCTION:    acpi_ex_unload_table
 477  *
 478  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 479  *
 480  * RETURN:      Status
 481  *
 482  * DESCRIPTION: Unload an ACPI table
 483  *
 484  ******************************************************************************/
 485
 486 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 487 {
 488         acpi_status status = AE_OK;
 489         union acpi_operand_object *table_desc = ddb_handle;
 490         u32 table_index;
 491         struct acpi_table_header *table;
 492
 493         ACPI_FUNCTION_TRACE(ex_unload_table);
 494
 495         /*
 496          * Validate the handle
 497          * Although the handle is partially validated in acpi_ex_reconfiguration(),
 498          * when it calls acpi_ex_resolve_operands(), the handle is more completely
 499          * validated here.
 500          */
 501         if ((!ddb_handle) ||
 502             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
 503             (ACPI_GET_OBJECT_TYPE(ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
 504                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 505         }
 506
 507         /* Get the table index from the ddb_handle */
 508
 509         table_index = table_desc->reference.value;
 510
 511         /* Invoke table handler if present */
 512
 513         if (acpi_gbl_table_handler) {
 514                 status = acpi_get_table_by_index(table_index, &table);
 515                 if (ACPI_SUCCESS(status)) {
 516                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 517                                                      table,
 518                                                      acpi_gbl_table_handler_context);
 519                 }
 520         }
 521
 522         /*
 523          * Delete the entire namespace under this table Node
 524          * (Offset contains the table_id)
 525          */
 526         acpi_tb_delete_namespace_by_owner(table_index);
 527         (void)acpi_tb_release_owner_id(table_index);
 528
 529         acpi_tb_set_table_loaded_flag(table_index, FALSE);
 530
 531         /* Table unloaded, remove a reference to the ddb_handle object */
 532
 533         acpi_ut_remove_reference(ddb_handle);
 534         return_ACPI_STATUS(AE_OK);
 535 }