git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/acpica/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 "accommon.h"
  46 #include "acinterp.h"
  47 #include "acnamesp.h"
  48 #include "actables.h"
  49 #include "acdispat.h"
  50
  51 #define _COMPONENT          ACPI_EXECUTER
  52 ACPI_MODULE_NAME("exconfig")
  53
  54 /* Local prototypes */
  55 static acpi_status
  56 acpi_ex_add_table(u32 table_index,
  57                   struct acpi_namespace_node *parent_node,
  58                   union acpi_operand_object **ddb_handle);
  59
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_ex_add_table
  63  *
  64  * PARAMETERS:  Table               - Pointer to raw table
  65  *              parent_node         - Where to load the table (scope)
  66  *              ddb_handle          - Where to return the table handle.
  67  *
  68  * RETURN:      Status
  69  *
  70  * DESCRIPTION: Common function to Install and Load an ACPI table with a
  71  *              returned table handle.
  72  *
  73  ******************************************************************************/
  74
  75 static acpi_status
  76 acpi_ex_add_table(u32 table_index,
  77                   struct acpi_namespace_node *parent_node,
  78                   union acpi_operand_object **ddb_handle)
  79 {
  80         acpi_status status;
  81         union acpi_operand_object *obj_desc;
  82
  83         ACPI_FUNCTION_TRACE(ex_add_table);
  84
  85         /* Create an object to be the table handle */
  86
  87         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
  88         if (!obj_desc) {
  89                 return_ACPI_STATUS(AE_NO_MEMORY);
  90         }
  91
  92         /* Init the table handle */
  93
  94         obj_desc->reference.class = ACPI_REFCLASS_TABLE;
  95         *ddb_handle = obj_desc;
  96
  97         /* Install the new table into the local data structures */
  98
  99         obj_desc->reference.value = table_index;
 100
 101         /* Add the table to the namespace */
 102
 103         status = acpi_ns_load_table(table_index, parent_node);
 104         if (ACPI_FAILURE(status)) {
 105                 acpi_ut_remove_reference(obj_desc);
 106                 *ddb_handle = NULL;
 107         }
 108
 109         return_ACPI_STATUS(status);
 110 }
 111
 112 /*******************************************************************************
 113  *
 114  * FUNCTION:    acpi_ex_load_table_op
 115  *
 116  * PARAMETERS:  walk_state          - Current state with operands
 117  *              return_desc         - Where to store the return object
 118  *
 119  * RETURN:      Status
 120  *
 121  * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
 122  *
 123  ******************************************************************************/
 124
 125 acpi_status
 126 acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
 127                       union acpi_operand_object **return_desc)
 128 {
 129         acpi_status status;
 130         union acpi_operand_object **operand = &walk_state->operands[0];
 131         struct acpi_namespace_node *parent_node;
 132         struct acpi_namespace_node *start_node;
 133         struct acpi_namespace_node *parameter_node = NULL;
 134         union acpi_operand_object *ddb_handle;
 135         struct acpi_table_header *table;
 136         u32 table_index;
 137
 138         ACPI_FUNCTION_TRACE(ex_load_table_op);
 139
 140         /* Validate lengths for the signature_string, OEMIDString, OEMtable_iD */
 141
 142         if ((operand[0]->string.length > ACPI_NAME_SIZE) ||
 143             (operand[1]->string.length > ACPI_OEM_ID_SIZE) ||
 144             (operand[2]->string.length > ACPI_OEM_TABLE_ID_SIZE)) {
 145                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 146         }
 147
 148         /* Find the ACPI table in the RSDT/XSDT */
 149
 150         status = acpi_tb_find_table(operand[0]->string.pointer,
 151                                     operand[1]->string.pointer,
 152                                     operand[2]->string.pointer, &table_index);
 153         if (ACPI_FAILURE(status)) {
 154                 if (status != AE_NOT_FOUND) {
 155                         return_ACPI_STATUS(status);
 156                 }
 157
 158                 /* Table not found, return an Integer=0 and AE_OK */
 159
 160                 ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 161                 if (!ddb_handle) {
 162                         return_ACPI_STATUS(AE_NO_MEMORY);
 163                 }
 164
 165                 ddb_handle->integer.value = 0;
 166                 *return_desc = ddb_handle;
 167
 168                 return_ACPI_STATUS(AE_OK);
 169         }
 170
 171         /* Default nodes */
 172
 173         start_node = walk_state->scope_info->scope.node;
 174         parent_node = acpi_gbl_root_node;
 175
 176         /* root_path (optional parameter) */
 177
 178         if (operand[3]->string.length > 0) {
 179                 /*
 180                  * Find the node referenced by the root_path_string. This is the
 181                  * location within the namespace where the table will be loaded.
 182                  */
 183                 status =
 184                     acpi_ns_get_node(start_node, operand[3]->string.pointer,
 185                                      ACPI_NS_SEARCH_PARENT, &parent_node);
 186                 if (ACPI_FAILURE(status)) {
 187                         return_ACPI_STATUS(status);
 188                 }
 189         }
 190
 191         /* parameter_path (optional parameter) */
 192
 193         if (operand[4]->string.length > 0) {
 194                 if ((operand[4]->string.pointer[0] != '\\') &&
 195                     (operand[4]->string.pointer[0] != '^')) {
 196                         /*
 197                          * Path is not absolute, so it will be relative to the node
 198                          * referenced by the root_path_string (or the NS root if omitted)
 199                          */
 200                         start_node = parent_node;
 201                 }
 202
 203                 /* Find the node referenced by the parameter_path_string */
 204
 205                 status =
 206                     acpi_ns_get_node(start_node, operand[4]->string.pointer,
 207                                      ACPI_NS_SEARCH_PARENT, &parameter_node);
 208                 if (ACPI_FAILURE(status)) {
 209                         return_ACPI_STATUS(status);
 210                 }
 211         }
 212
 213         /* Load the table into the namespace */
 214
 215         status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
 216         if (ACPI_FAILURE(status)) {
 217                 return_ACPI_STATUS(status);
 218         }
 219
 220         /* Parameter Data (optional) */
 221
 222         if (parameter_node) {
 223
 224                 /* Store the parameter data into the optional parameter object */
 225
 226                 status = acpi_ex_store(operand[5],
 227                                        ACPI_CAST_PTR(union acpi_operand_object,
 228                                                      parameter_node),
 229                                        walk_state);
 230                 if (ACPI_FAILURE(status)) {
 231                         (void)acpi_ex_unload_table(ddb_handle);
 232                         return_ACPI_STATUS(status);
 233                 }
 234         }
 235
 236         status = acpi_get_table_by_index(table_index, &table);
 237         if (ACPI_SUCCESS(status)) {
 238                 ACPI_INFO((AE_INFO,
 239                            "Dynamic OEM Table Load - [%.4s] OemId [%.6s] OemTableId [%.8s]",
 240                            table->signature, table->oem_id,
 241                            table->oem_table_id));
 242         }
 243
 244         /* Invoke table handler if present */
 245
 246         if (acpi_gbl_table_handler) {
 247                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 248                                              acpi_gbl_table_handler_context);
 249         }
 250
 251         *return_desc = ddb_handle;
 252         return_ACPI_STATUS(status);
 253 }
 254
 255 /*******************************************************************************
 256  *
 257  * FUNCTION:    acpi_ex_load_op
 258  *
 259  * PARAMETERS:  obj_desc        - Region or Buffer/Field where the table will be
 260  *                                obtained
 261  *              Target          - Where a handle to the table will be stored
 262  *              walk_state      - Current state
 263  *
 264  * RETURN:      Status
 265  *
 266  * DESCRIPTION: Load an ACPI table from a field or operation region
 267  *
 268  * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
 269  *       objects before this code is reached.
 270  *
 271  *       If source is an operation region, it must refer to system_memory, as
 272  *       per the ACPI specification.
 273  *
 274  ******************************************************************************/
 275
 276 acpi_status
 277 acpi_ex_load_op(union acpi_operand_object *obj_desc,
 278                 union acpi_operand_object *target,
 279                 struct acpi_walk_state *walk_state)
 280 {
 281         union acpi_operand_object *ddb_handle;
 282         struct acpi_table_header *table;
 283         struct acpi_table_desc table_desc;
 284         u32 table_index;
 285         acpi_status status;
 286         u32 length;
 287
 288         ACPI_FUNCTION_TRACE(ex_load_op);
 289
 290         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
 291
 292         /* Source Object can be either an op_region or a Buffer/Field */
 293
 294         switch (obj_desc->common.type) {
 295         case ACPI_TYPE_REGION:
 296
 297                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 298                                   "Load table from Region %p\n", obj_desc));
 299
 300                 /* Region must be system_memory (from ACPI spec) */
 301
 302                 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
 303                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 304                 }
 305
 306                 /*
 307                  * If the Region Address and Length have not been previously evaluated,
 308                  * evaluate them now and save the results.
 309                  */
 310                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 311                         status = acpi_ds_get_region_arguments(obj_desc);
 312                         if (ACPI_FAILURE(status)) {
 313                                 return_ACPI_STATUS(status);
 314                         }
 315                 }
 316
 317                 /*
 318                  * Map the table header and get the actual table length. The region
 319                  * length is not guaranteed to be the same as the table length.
 320                  */
 321                 table = acpi_os_map_memory(obj_desc->region.address,
 322                                            sizeof(struct acpi_table_header));
 323                 if (!table) {
 324                         return_ACPI_STATUS(AE_NO_MEMORY);
 325                 }
 326
 327                 length = table->length;
 328                 acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
 329
 330                 /* Must have at least an ACPI table header */
 331
 332                 if (length < sizeof(struct acpi_table_header)) {
 333                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 334                 }
 335
 336                 /*
 337                  * The memory region is not guaranteed to remain stable and we must
 338                  * copy the table to a local buffer. For example, the memory region
 339                  * is corrupted after suspend on some machines. Dynamically loaded
 340                  * tables are usually small, so this overhead is minimal.
 341                  */
 342
 343                 /* Allocate a buffer for the table */
 344
 345                 table_desc.pointer = ACPI_ALLOCATE(length);
 346                 if (!table_desc.pointer) {
 347                         return_ACPI_STATUS(AE_NO_MEMORY);
 348                 }
 349
 350                 /* Map the entire table and copy it */
 351
 352                 table = acpi_os_map_memory(obj_desc->region.address, length);
 353                 if (!table) {
 354                         ACPI_FREE(table_desc.pointer);
 355                         return_ACPI_STATUS(AE_NO_MEMORY);
 356                 }
 357
 358                 ACPI_MEMCPY(table_desc.pointer, table, length);
 359                 acpi_os_unmap_memory(table, length);
 360
 361                 table_desc.address = obj_desc->region.address;
 362                 break;
 363
 364         case ACPI_TYPE_BUFFER:  /* Buffer or resolved region_field */
 365
 366                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 367                                   "Load table from Buffer or Field %p\n",
 368                                   obj_desc));
 369
 370                 /* Must have at least an ACPI table header */
 371
 372                 if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
 373                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 374                 }
 375
 376                 /* Get the actual table length from the table header */
 377
 378                 table =
 379                     ACPI_CAST_PTR(struct acpi_table_header,
 380                                   obj_desc->buffer.pointer);
 381                 length = table->length;
 382
 383                 /* Table cannot extend beyond the buffer */
 384
 385                 if (length > obj_desc->buffer.length) {
 386                         return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
 387                 }
 388                 if (length < sizeof(struct acpi_table_header)) {
 389                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 390                 }
 391
 392                 /*
 393                  * Copy the table from the buffer because the buffer could be modified
 394                  * or even deleted in the future
 395                  */
 396                 table_desc.pointer = ACPI_ALLOCATE(length);
 397                 if (!table_desc.pointer) {
 398                         return_ACPI_STATUS(AE_NO_MEMORY);
 399                 }
 400
 401                 ACPI_MEMCPY(table_desc.pointer, table, length);
 402                 table_desc.address = ACPI_TO_INTEGER(table_desc.pointer);
 403                 break;
 404
 405         default:
 406                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 407         }
 408
 409         /* Validate table checksum (will not get validated in tb_add_table) */
 410
 411         status = acpi_tb_verify_checksum(table_desc.pointer, length);
 412         if (ACPI_FAILURE(status)) {
 413                 ACPI_FREE(table_desc.pointer);
 414                 return_ACPI_STATUS(status);
 415         }
 416
 417         /* Complete the table descriptor */
 418
 419         table_desc.length = length;
 420         table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;
 421
 422         /* Install the new table into the local data structures */
 423
 424         status = acpi_tb_add_table(&table_desc, &table_index);
 425         if (ACPI_FAILURE(status)) {
 426                 goto cleanup;
 427         }
 428
 429         /*
 430          * Add the table to the namespace.
 431          *
 432          * Note: Load the table objects relative to the root of the namespace.
 433          * This appears to go against the ACPI specification, but we do it for
 434          * compatibility with other ACPI implementations.
 435          */
 436         status =
 437             acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
 438         if (ACPI_FAILURE(status)) {
 439
 440                 /* On error, table_ptr was deallocated above */
 441
 442                 return_ACPI_STATUS(status);
 443         }
 444
 445         /* Store the ddb_handle into the Target operand */
 446
 447         status = acpi_ex_store(ddb_handle, target, walk_state);
 448         if (ACPI_FAILURE(status)) {
 449                 (void)acpi_ex_unload_table(ddb_handle);
 450
 451                 /* table_ptr was deallocated above */
 452
 453                 acpi_ut_remove_reference(ddb_handle);
 454                 return_ACPI_STATUS(status);
 455         }
 456
 457         /* Invoke table handler if present */
 458
 459         if (acpi_gbl_table_handler) {
 460                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD,
 461                                              table_desc.pointer,
 462                                              acpi_gbl_table_handler_context);
 463         }
 464
 465       cleanup:
 466         if (ACPI_FAILURE(status)) {
 467
 468                 /* Delete allocated table buffer */
 469
 470                 acpi_tb_delete_table(&table_desc);
 471         }
 472         return_ACPI_STATUS(status);
 473 }
 474
 475 /*******************************************************************************
 476  *
 477  * FUNCTION:    acpi_ex_unload_table
 478  *
 479  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 480  *
 481  * RETURN:      Status
 482  *
 483  * DESCRIPTION: Unload an ACPI table
 484  *
 485  ******************************************************************************/
 486
 487 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 488 {
 489         acpi_status status = AE_OK;
 490         union acpi_operand_object *table_desc = ddb_handle;
 491         u32 table_index;
 492         struct acpi_table_header *table;
 493
 494         ACPI_FUNCTION_TRACE(ex_unload_table);
 495
 496         /*
 497          * Validate the handle
 498          * Although the handle is partially validated in acpi_ex_reconfiguration(),
 499          * when it calls acpi_ex_resolve_operands(), the handle is more completely
 500          * validated here.
 501          */
 502         if ((!ddb_handle) ||
 503             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
 504             (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE)) {
 505                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 506         }
 507
 508         /* Get the table index from the ddb_handle */
 509
 510         table_index = table_desc->reference.value;
 511
 512         /* Invoke table handler if present */
 513
 514         if (acpi_gbl_table_handler) {
 515                 status = acpi_get_table_by_index(table_index, &table);
 516                 if (ACPI_SUCCESS(status)) {
 517                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 518                                                      table,
 519                                                      acpi_gbl_table_handler_context);
 520                 }
 521         }
 522
 523         /* Delete the portion of the namespace owned by this table */
 524
 525         status = acpi_tb_delete_namespace_by_owner(table_index);
 526         if (ACPI_FAILURE(status)) {
 527                 return_ACPI_STATUS(status);
 528         }
 529
 530         (void)acpi_tb_release_owner_id(table_index);
 531         acpi_tb_set_table_loaded_flag(table_index, FALSE);
 532
 533         /* Table unloaded, remove a reference to the ddb_handle object */
 534
 535         acpi_ut_remove_reference(ddb_handle);
 536         return_ACPI_STATUS(AE_OK);
 537 }