git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/executer/exconfig.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
   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/acinterp.h>
  46 #include <acpi/amlcode.h>
  47 #include <acpi/acnamesp.h>
  48 #include <acpi/acevents.h>
  49 #include <acpi/actables.h>
  50 #include <acpi/acdispat.h>
  51
  52 #define _COMPONENT          ACPI_EXECUTER
  53 ACPI_MODULE_NAME("exconfig")
  54
  55 /* Local prototypes */
  56 static acpi_status
  57 acpi_ex_add_table(struct acpi_table_header *table,
  58                   struct acpi_namespace_node *parent_node,
  59                   union acpi_operand_object **ddb_handle);
  60
  61 /*******************************************************************************
  62  *
  63  * FUNCTION:    acpi_ex_add_table
  64  *
  65  * PARAMETERS:  Table               - Pointer to raw table
  66  *              parent_node         - Where to load the table (scope)
  67  *              ddb_handle          - Where to return the table handle.
  68  *
  69  * RETURN:      Status
  70  *
  71  * DESCRIPTION: Common function to Install and Load an ACPI table with a
  72  *              returned table handle.
  73  *
  74  ******************************************************************************/
  75
  76 static acpi_status
  77 acpi_ex_add_table(struct acpi_table_header *table,
  78                   struct acpi_namespace_node *parent_node,
  79                   union acpi_operand_object **ddb_handle)
  80 {
  81         acpi_status status;
  82         struct acpi_table_desc table_info;
  83         union acpi_operand_object *obj_desc;
  84
  85         ACPI_FUNCTION_TRACE("ex_add_table");
  86
  87         /* Create an object to be the table handle */
  88
  89         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
  90         if (!obj_desc) {
  91                 return_ACPI_STATUS(AE_NO_MEMORY);
  92         }
  93
  94         /* Init the table handle */
  95
  96         obj_desc->reference.opcode = AML_LOAD_OP;
  97         *ddb_handle = obj_desc;
  98
  99         /* Install the new table into the local data structures */
 100
 101         ACPI_MEMSET(&table_info, 0, sizeof(struct acpi_table_desc));
 102
 103         table_info.type = ACPI_TABLE_SSDT;
 104         table_info.pointer = table;
 105         table_info.length = (acpi_size) table->length;
 106         table_info.allocation = ACPI_MEM_ALLOCATED;
 107
 108         status = acpi_tb_install_table(&table_info);
 109         obj_desc->reference.object = table_info.installed_desc;
 110
 111         if (ACPI_FAILURE(status)) {
 112                 if (status == AE_ALREADY_EXISTS) {
 113                         /* Table already exists, just return the handle */
 114
 115                         return_ACPI_STATUS(AE_OK);
 116                 }
 117                 goto cleanup;
 118         }
 119
 120         /* Add the table to the namespace */
 121
 122         status = acpi_ns_load_table(table_info.installed_desc, parent_node);
 123         if (ACPI_FAILURE(status)) {
 124                 /* Uninstall table on error */
 125
 126                 (void)acpi_tb_uninstall_table(table_info.installed_desc);
 127                 goto cleanup;
 128         }
 129
 130         return_ACPI_STATUS(AE_OK);
 131
 132       cleanup:
 133         acpi_ut_remove_reference(obj_desc);
 134         *ddb_handle = NULL;
 135         return_ACPI_STATUS(status);
 136 }
 137
 138 /*******************************************************************************
 139  *
 140  * FUNCTION:    acpi_ex_load_table_op
 141  *
 142  * PARAMETERS:  walk_state          - Current state with operands
 143  *              return_desc         - Where to store the return object
 144  *
 145  * RETURN:      Status
 146  *
 147  * DESCRIPTION: Load an ACPI table
 148  *
 149  ******************************************************************************/
 150
 151 acpi_status
 152 acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
 153                       union acpi_operand_object **return_desc)
 154 {
 155         acpi_status status;
 156         union acpi_operand_object **operand = &walk_state->operands[0];
 157         struct acpi_table_header *table;
 158         struct acpi_namespace_node *parent_node;
 159         struct acpi_namespace_node *start_node;
 160         struct acpi_namespace_node *parameter_node = NULL;
 161         union acpi_operand_object *ddb_handle;
 162
 163         ACPI_FUNCTION_TRACE("ex_load_table_op");
 164
 165 #if 0
 166         /*
 167          * Make sure that the signature does not match one of the tables that
 168          * is already loaded.
 169          */
 170         status = acpi_tb_match_signature(operand[0]->string.pointer, NULL);
 171         if (status == AE_OK) {
 172                 /* Signature matched -- don't allow override */
 173
 174                 return_ACPI_STATUS(AE_ALREADY_EXISTS);
 175         }
 176 #endif
 177
 178         /* Find the ACPI table */
 179
 180         status = acpi_tb_find_table(operand[0]->string.pointer,
 181                                     operand[1]->string.pointer,
 182                                     operand[2]->string.pointer, &table);
 183         if (ACPI_FAILURE(status)) {
 184                 if (status != AE_NOT_FOUND) {
 185                         return_ACPI_STATUS(status);
 186                 }
 187
 188                 /* Table not found, return an Integer=0 and AE_OK */
 189
 190                 ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 191                 if (!ddb_handle) {
 192                         return_ACPI_STATUS(AE_NO_MEMORY);
 193                 }
 194
 195                 ddb_handle->integer.value = 0;
 196                 *return_desc = ddb_handle;
 197
 198                 return_ACPI_STATUS(AE_OK);
 199         }
 200
 201         /* Default nodes */
 202
 203         start_node = walk_state->scope_info->scope.node;
 204         parent_node = acpi_gbl_root_node;
 205
 206         /* root_path (optional parameter) */
 207
 208         if (operand[3]->string.length > 0) {
 209                 /*
 210                  * Find the node referenced by the root_path_string. This is the
 211                  * location within the namespace where the table will be loaded.
 212                  */
 213                 status =
 214                     acpi_ns_get_node_by_path(operand[3]->string.pointer,
 215                                              start_node, ACPI_NS_SEARCH_PARENT,
 216                                              &parent_node);
 217                 if (ACPI_FAILURE(status)) {
 218                         return_ACPI_STATUS(status);
 219                 }
 220         }
 221
 222         /* parameter_path (optional parameter) */
 223
 224         if (operand[4]->string.length > 0) {
 225                 if ((operand[4]->string.pointer[0] != '\\') &&
 226                     (operand[4]->string.pointer[0] != '^')) {
 227                         /*
 228                          * Path is not absolute, so it will be relative to the node
 229                          * referenced by the root_path_string (or the NS root if omitted)
 230                          */
 231                         start_node = parent_node;
 232                 }
 233
 234                 /* Find the node referenced by the parameter_path_string */
 235
 236                 status =
 237                     acpi_ns_get_node_by_path(operand[4]->string.pointer,
 238                                              start_node, ACPI_NS_SEARCH_PARENT,
 239                                              &parameter_node);
 240                 if (ACPI_FAILURE(status)) {
 241                         return_ACPI_STATUS(status);
 242                 }
 243         }
 244
 245         /* Load the table into the namespace */
 246
 247         status = acpi_ex_add_table(table, parent_node, &ddb_handle);
 248         if (ACPI_FAILURE(status)) {
 249                 return_ACPI_STATUS(status);
 250         }
 251
 252         /* Parameter Data (optional) */
 253
 254         if (parameter_node) {
 255                 /* Store the parameter data into the optional parameter object */
 256
 257                 status = acpi_ex_store(operand[5],
 258                                        ACPI_CAST_PTR(union acpi_operand_object,
 259                                                      parameter_node),
 260                                        walk_state);
 261                 if (ACPI_FAILURE(status)) {
 262                         (void)acpi_ex_unload_table(ddb_handle);
 263                         return_ACPI_STATUS(status);
 264                 }
 265         }
 266
 267         *return_desc = ddb_handle;
 268         return_ACPI_STATUS(status);
 269 }
 270
 271 /*******************************************************************************
 272  *
 273  * FUNCTION:    acpi_ex_load_op
 274  *
 275  * PARAMETERS:  obj_desc        - Region or Field where the table will be
 276  *                                obtained
 277  *              Target          - Where a handle to the table will be stored
 278  *              walk_state      - Current state
 279  *
 280  * RETURN:      Status
 281  *
 282  * DESCRIPTION: Load an ACPI table from a field or operation region
 283  *
 284  ******************************************************************************/
 285
 286 acpi_status
 287 acpi_ex_load_op(union acpi_operand_object *obj_desc,
 288                 union acpi_operand_object *target,
 289                 struct acpi_walk_state *walk_state)
 290 {
 291         acpi_status status;
 292         union acpi_operand_object *ddb_handle;
 293         union acpi_operand_object *buffer_desc = NULL;
 294         struct acpi_table_header *table_ptr = NULL;
 295         acpi_physical_address address;
 296         struct acpi_table_header table_header;
 297         u32 i;
 298
 299         ACPI_FUNCTION_TRACE("ex_load_op");
 300
 301         /* Object can be either an op_region or a Field */
 302
 303         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 304         case ACPI_TYPE_REGION:
 305
 306                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Region %p %s\n",
 307                                   obj_desc,
 308                                   acpi_ut_get_object_type_name(obj_desc)));
 309
 310                 /*
 311                  * If the Region Address and Length have not been previously evaluated,
 312                  * evaluate them now and save the results.
 313                  */
 314                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 315                         status = acpi_ds_get_region_arguments(obj_desc);
 316                         if (ACPI_FAILURE(status)) {
 317                                 return_ACPI_STATUS(status);
 318                         }
 319                 }
 320
 321                 /* Get the base physical address of the region */
 322
 323                 address = obj_desc->region.address;
 324
 325                 /* Get the table length from the table header */
 326
 327                 table_header.length = 0;
 328                 for (i = 0; i < 8; i++) {
 329                         status =
 330                             acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
 331                                                            (acpi_physical_address)
 332                                                            (i + address), 8,
 333                                                            ((u8 *) &
 334                                                             table_header) + i);
 335                         if (ACPI_FAILURE(status)) {
 336                                 return_ACPI_STATUS(status);
 337                         }
 338                 }
 339
 340                 /* Sanity check the table length */
 341
 342                 if (table_header.length < sizeof(struct acpi_table_header)) {
 343                         return_ACPI_STATUS(AE_BAD_HEADER);
 344                 }
 345
 346                 /* Allocate a buffer for the entire table */
 347
 348                 table_ptr = ACPI_MEM_ALLOCATE(table_header.length);
 349                 if (!table_ptr) {
 350                         return_ACPI_STATUS(AE_NO_MEMORY);
 351                 }
 352
 353                 /* Get the entire table from the op region */
 354
 355                 for (i = 0; i < table_header.length; i++) {
 356                         status =
 357                             acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
 358                                                            (acpi_physical_address)
 359                                                            (i + address), 8,
 360                                                            ((u8 *) table_ptr +
 361                                                             i));
 362                         if (ACPI_FAILURE(status)) {
 363                                 goto cleanup;
 364                         }
 365                 }
 366                 break;
 367
 368         case ACPI_TYPE_LOCAL_REGION_FIELD:
 369         case ACPI_TYPE_LOCAL_BANK_FIELD:
 370         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 371
 372                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Field %p %s\n",
 373                                   obj_desc,
 374                                   acpi_ut_get_object_type_name(obj_desc)));
 375
 376                 /*
 377                  * The length of the field must be at least as large as the table.
 378                  * Read the entire field and thus the entire table.  Buffer is
 379                  * allocated during the read.
 380                  */
 381                 status =
 382                     acpi_ex_read_data_from_field(walk_state, obj_desc,
 383                                                  &buffer_desc);
 384                 if (ACPI_FAILURE(status)) {
 385                         return_ACPI_STATUS(status);
 386                 }
 387
 388                 table_ptr = ACPI_CAST_PTR(struct acpi_table_header,
 389                                           buffer_desc->buffer.pointer);
 390
 391                 /* All done with the buffer_desc, delete it */
 392
 393                 buffer_desc->buffer.pointer = NULL;
 394                 acpi_ut_remove_reference(buffer_desc);
 395
 396                 /* Sanity check the table length */
 397
 398                 if (table_ptr->length < sizeof(struct acpi_table_header)) {
 399                         status = AE_BAD_HEADER;
 400                         goto cleanup;
 401                 }
 402                 break;
 403
 404         default:
 405                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 406         }
 407
 408         /* The table must be either an SSDT or a PSDT */
 409
 410         if ((!ACPI_STRNCMP(table_ptr->signature,
 411                            acpi_gbl_table_data[ACPI_TABLE_PSDT].signature,
 412                            acpi_gbl_table_data[ACPI_TABLE_PSDT].sig_length)) &&
 413             (!ACPI_STRNCMP(table_ptr->signature,
 414                            acpi_gbl_table_data[ACPI_TABLE_SSDT].signature,
 415                            acpi_gbl_table_data[ACPI_TABLE_SSDT].sig_length))) {
 416                 ACPI_ERROR((AE_INFO,
 417                             "Table has invalid signature [%4.4s], must be SSDT or PSDT",
 418                             table_ptr->signature));
 419                 status = AE_BAD_SIGNATURE;
 420                 goto cleanup;
 421         }
 422
 423         /* Install the new table into the local data structures */
 424
 425         status = acpi_ex_add_table(table_ptr, acpi_gbl_root_node, &ddb_handle);
 426         if (ACPI_FAILURE(status)) {
 427                 /* On error, table_ptr was deallocated above */
 428
 429                 return_ACPI_STATUS(status);
 430         }
 431
 432         /* Store the ddb_handle into the Target operand */
 433
 434         status = acpi_ex_store(ddb_handle, target, walk_state);
 435         if (ACPI_FAILURE(status)) {
 436                 (void)acpi_ex_unload_table(ddb_handle);
 437
 438                 /* table_ptr was deallocated above */
 439
 440                 return_ACPI_STATUS(status);
 441         }
 442
 443       cleanup:
 444         if (ACPI_FAILURE(status)) {
 445                 ACPI_MEM_FREE(table_ptr);
 446         }
 447         return_ACPI_STATUS(status);
 448 }
 449
 450 /*******************************************************************************
 451  *
 452  * FUNCTION:    acpi_ex_unload_table
 453  *
 454  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 455  *
 456  * RETURN:      Status
 457  *
 458  * DESCRIPTION: Unload an ACPI table
 459  *
 460  ******************************************************************************/
 461
 462 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 463 {
 464         acpi_status status = AE_OK;
 465         union acpi_operand_object *table_desc = ddb_handle;
 466         struct acpi_table_desc *table_info;
 467
 468         ACPI_FUNCTION_TRACE("ex_unload_table");
 469
 470         /*
 471          * Validate the handle
 472          * Although the handle is partially validated in acpi_ex_reconfiguration(),
 473          * when it calls acpi_ex_resolve_operands(), the handle is more completely
 474          * validated here.
 475          */
 476         if ((!ddb_handle) ||
 477             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
 478             (ACPI_GET_OBJECT_TYPE(ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
 479                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 480         }
 481
 482         /* Get the actual table descriptor from the ddb_handle */
 483
 484         table_info = (struct acpi_table_desc *)table_desc->reference.object;
 485
 486         /*
 487          * Delete the entire namespace under this table Node
 488          * (Offset contains the table_id)
 489          */
 490         acpi_ns_delete_namespace_by_owner(table_info->owner_id);
 491         acpi_ut_release_owner_id(&table_info->owner_id);
 492
 493         /* Delete the table itself */
 494
 495         (void)acpi_tb_uninstall_table(table_info->installed_desc);
 496
 497         /* Delete the table descriptor (ddb_handle) */
 498
 499         acpi_ut_remove_reference(table_desc);
 500         return_ACPI_STATUS(status);
 501 }