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_ID_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
 114                         /* Table already exists, just return the handle */
 115
 116                         return_ACPI_STATUS(AE_OK);
 117                 }
 118                 goto cleanup;
 119         }
 120
 121         /* Add the table to the namespace */
 122
 123         status = acpi_ns_load_table(table_info.installed_desc, parent_node);
 124         if (ACPI_FAILURE(status)) {
 125
 126                 /* Uninstall table on error */
 127
 128                 (void)acpi_tb_uninstall_table(table_info.installed_desc);
 129                 goto cleanup;
 130         }
 131
 132         return_ACPI_STATUS(AE_OK);
 133
 134       cleanup:
 135         acpi_ut_remove_reference(obj_desc);
 136         *ddb_handle = NULL;
 137         return_ACPI_STATUS(status);
 138 }
 139
 140 /*******************************************************************************
 141  *
 142  * FUNCTION:    acpi_ex_load_table_op
 143  *
 144  * PARAMETERS:  walk_state          - Current state with operands
 145  *              return_desc         - Where to store the return object
 146  *
 147  * RETURN:      Status
 148  *
 149  * DESCRIPTION: Load an ACPI table
 150  *
 151  ******************************************************************************/
 152
 153 acpi_status
 154 acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
 155                       union acpi_operand_object **return_desc)
 156 {
 157         acpi_status status;
 158         union acpi_operand_object **operand = &walk_state->operands[0];
 159         struct acpi_table_header *table;
 160         struct acpi_namespace_node *parent_node;
 161         struct acpi_namespace_node *start_node;
 162         struct acpi_namespace_node *parameter_node = NULL;
 163         union acpi_operand_object *ddb_handle;
 164
 165         ACPI_FUNCTION_TRACE(ex_load_table_op);
 166
 167 #if 0
 168         /*
 169          * Make sure that the signature does not match one of the tables that
 170          * is already loaded.
 171          */
 172         status = acpi_tb_match_signature(operand[0]->string.pointer, NULL);
 173         if (status == AE_OK) {
 174
 175                 /* Signature matched -- don't allow override */
 176
 177                 return_ACPI_STATUS(AE_ALREADY_EXISTS);
 178         }
 179 #endif
 180
 181         /* Find the ACPI table */
 182
 183         status = acpi_tb_find_table(operand[0]->string.pointer,
 184                                     operand[1]->string.pointer,
 185                                     operand[2]->string.pointer, &table);
 186         if (ACPI_FAILURE(status)) {
 187                 if (status != AE_NOT_FOUND) {
 188                         return_ACPI_STATUS(status);
 189                 }
 190
 191                 /* Table not found, return an Integer=0 and AE_OK */
 192
 193                 ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 194                 if (!ddb_handle) {
 195                         return_ACPI_STATUS(AE_NO_MEMORY);
 196                 }
 197
 198                 ddb_handle->integer.value = 0;
 199                 *return_desc = ddb_handle;
 200
 201                 return_ACPI_STATUS(AE_OK);
 202         }
 203
 204         /* Default nodes */
 205
 206         start_node = walk_state->scope_info->scope.node;
 207         parent_node = acpi_gbl_root_node;
 208
 209         /* root_path (optional parameter) */
 210
 211         if (operand[3]->string.length > 0) {
 212                 /*
 213                  * Find the node referenced by the root_path_string. This is the
 214                  * location within the namespace where the table will be loaded.
 215                  */
 216                 status =
 217                     acpi_ns_get_node_by_path(operand[3]->string.pointer,
 218                                              start_node, ACPI_NS_SEARCH_PARENT,
 219                                              &parent_node);
 220                 if (ACPI_FAILURE(status)) {
 221                         return_ACPI_STATUS(status);
 222                 }
 223         }
 224
 225         /* parameter_path (optional parameter) */
 226
 227         if (operand[4]->string.length > 0) {
 228                 if ((operand[4]->string.pointer[0] != '\\') &&
 229                     (operand[4]->string.pointer[0] != '^')) {
 230                         /*
 231                          * Path is not absolute, so it will be relative to the node
 232                          * referenced by the root_path_string (or the NS root if omitted)
 233                          */
 234                         start_node = parent_node;
 235                 }
 236
 237                 /* Find the node referenced by the parameter_path_string */
 238
 239                 status =
 240                     acpi_ns_get_node_by_path(operand[4]->string.pointer,
 241                                              start_node, ACPI_NS_SEARCH_PARENT,
 242                                              &parameter_node);
 243                 if (ACPI_FAILURE(status)) {
 244                         return_ACPI_STATUS(status);
 245                 }
 246         }
 247
 248         /* Load the table into the namespace */
 249
 250         status = acpi_ex_add_table(table, parent_node, &ddb_handle);
 251         if (ACPI_FAILURE(status)) {
 252                 return_ACPI_STATUS(status);
 253         }
 254
 255         /* Parameter Data (optional) */
 256
 257         if (parameter_node) {
 258
 259                 /* Store the parameter data into the optional parameter object */
 260
 261                 status = acpi_ex_store(operand[5],
 262                                        ACPI_CAST_PTR(union acpi_operand_object,
 263                                                      parameter_node),
 264                                        walk_state);
 265                 if (ACPI_FAILURE(status)) {
 266                         (void)acpi_ex_unload_table(ddb_handle);
 267                         return_ACPI_STATUS(status);
 268                 }
 269         }
 270
 271         *return_desc = ddb_handle;
 272         return_ACPI_STATUS(status);
 273 }
 274
 275 /*******************************************************************************
 276  *
 277  * FUNCTION:    acpi_ex_load_op
 278  *
 279  * PARAMETERS:  obj_desc        - Region or Field where the table will be
 280  *                                obtained
 281  *              Target          - Where a handle to the table will be stored
 282  *              walk_state      - Current state
 283  *
 284  * RETURN:      Status
 285  *
 286  * DESCRIPTION: Load an ACPI table from a field or operation region
 287  *
 288  ******************************************************************************/
 289
 290 acpi_status
 291 acpi_ex_load_op(union acpi_operand_object *obj_desc,
 292                 union acpi_operand_object *target,
 293                 struct acpi_walk_state *walk_state)
 294 {
 295         acpi_status status;
 296         union acpi_operand_object *ddb_handle;
 297         union acpi_operand_object *buffer_desc = NULL;
 298         struct acpi_table_header *table_ptr = NULL;
 299         acpi_physical_address address;
 300         struct acpi_table_header table_header;
 301         acpi_integer temp;
 302         u32 i;
 303
 304         ACPI_FUNCTION_TRACE(ex_load_op);
 305
 306         /* Object can be either an op_region or a Field */
 307
 308         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 309         case ACPI_TYPE_REGION:
 310
 311                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Region %p %s\n",
 312                                   obj_desc,
 313                                   acpi_ut_get_object_type_name(obj_desc)));
 314
 315                 /*
 316                  * If the Region Address and Length have not been previously evaluated,
 317                  * evaluate them now and save the results.
 318                  */
 319                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 320                         status = acpi_ds_get_region_arguments(obj_desc);
 321                         if (ACPI_FAILURE(status)) {
 322                                 return_ACPI_STATUS(status);
 323                         }
 324                 }
 325
 326                 /* Get the base physical address of the region */
 327
 328                 address = obj_desc->region.address;
 329
 330                 /* Get part of the table header to get the table length */
 331
 332                 table_header.length = 0;
 333                 for (i = 0; i < 8; i++) {
 334                         status =
 335                             acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
 336                                                            (acpi_physical_address)
 337                                                            (i + address), 8,
 338                                                            &temp);
 339                         if (ACPI_FAILURE(status)) {
 340                                 return_ACPI_STATUS(status);
 341                         }
 342
 343                         /* Get the one valid byte of the returned 64-bit value */
 344
 345                         ACPI_CAST_PTR(u8, &table_header)[i] = (u8) temp;
 346                 }
 347
 348                 /* Sanity check the table length */
 349
 350                 if (table_header.length < sizeof(struct acpi_table_header)) {
 351                         return_ACPI_STATUS(AE_BAD_HEADER);
 352                 }
 353
 354                 /* Allocate a buffer for the entire table */
 355
 356                 table_ptr = ACPI_ALLOCATE(table_header.length);
 357                 if (!table_ptr) {
 358                         return_ACPI_STATUS(AE_NO_MEMORY);
 359                 }
 360
 361                 /* Get the entire table from the op region */
 362
 363                 for (i = 0; i < table_header.length; i++) {
 364                         status =
 365                             acpi_ev_address_space_dispatch(obj_desc, ACPI_READ,
 366                                                            (acpi_physical_address)
 367                                                            (i + address), 8,
 368                                                            &temp);
 369                         if (ACPI_FAILURE(status)) {
 370                                 goto cleanup;
 371                         }
 372
 373                         /* Get the one valid byte of the returned 64-bit value */
 374
 375                         ACPI_CAST_PTR(u8, table_ptr)[i] = (u8) temp;
 376                 }
 377                 break;
 378
 379         case ACPI_TYPE_LOCAL_REGION_FIELD:
 380         case ACPI_TYPE_LOCAL_BANK_FIELD:
 381         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 382
 383                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Field %p %s\n",
 384                                   obj_desc,
 385                                   acpi_ut_get_object_type_name(obj_desc)));
 386
 387                 /*
 388                  * The length of the field must be at least as large as the table.
 389                  * Read the entire field and thus the entire table.  Buffer is
 390                  * allocated during the read.
 391                  */
 392                 status =
 393                     acpi_ex_read_data_from_field(walk_state, obj_desc,
 394                                                  &buffer_desc);
 395                 if (ACPI_FAILURE(status)) {
 396                         return_ACPI_STATUS(status);
 397                 }
 398
 399                 table_ptr = ACPI_CAST_PTR(struct acpi_table_header,
 400                                           buffer_desc->buffer.pointer);
 401
 402                 /* All done with the buffer_desc, delete it */
 403
 404                 buffer_desc->buffer.pointer = NULL;
 405                 acpi_ut_remove_reference(buffer_desc);
 406
 407                 /* Sanity check the table length */
 408
 409                 if (table_ptr->length < sizeof(struct acpi_table_header)) {
 410                         status = AE_BAD_HEADER;
 411                         goto cleanup;
 412                 }
 413                 break;
 414
 415         default:
 416                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 417         }
 418
 419         /* The table must be either an SSDT or a PSDT */
 420
 421         if ((!ACPI_COMPARE_NAME(table_ptr->signature, PSDT_SIG)) &&
 422             (!ACPI_COMPARE_NAME(table_ptr->signature, SSDT_SIG))) {
 423                 ACPI_ERROR((AE_INFO,
 424                             "Table has invalid signature [%4.4s], must be SSDT or PSDT",
 425                             table_ptr->signature));
 426                 status = AE_BAD_SIGNATURE;
 427                 goto cleanup;
 428         }
 429
 430         /* Install the new table into the local data structures */
 431
 432         status = acpi_ex_add_table(table_ptr, acpi_gbl_root_node, &ddb_handle);
 433         if (ACPI_FAILURE(status)) {
 434
 435                 /* On error, table_ptr was deallocated above */
 436
 437                 return_ACPI_STATUS(status);
 438         }
 439
 440         /* Store the ddb_handle into the Target operand */
 441
 442         status = acpi_ex_store(ddb_handle, target, walk_state);
 443         if (ACPI_FAILURE(status)) {
 444                 (void)acpi_ex_unload_table(ddb_handle);
 445
 446                 /* table_ptr was deallocated above */
 447
 448                 return_ACPI_STATUS(status);
 449         }
 450
 451       cleanup:
 452         if (ACPI_FAILURE(status)) {
 453                 ACPI_FREE(table_ptr);
 454         }
 455         return_ACPI_STATUS(status);
 456 }
 457
 458 /*******************************************************************************
 459  *
 460  * FUNCTION:    acpi_ex_unload_table
 461  *
 462  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 463  *
 464  * RETURN:      Status
 465  *
 466  * DESCRIPTION: Unload an ACPI table
 467  *
 468  ******************************************************************************/
 469
 470 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 471 {
 472         acpi_status status = AE_OK;
 473         union acpi_operand_object *table_desc = ddb_handle;
 474         struct acpi_table_desc *table_info;
 475
 476         ACPI_FUNCTION_TRACE(ex_unload_table);
 477
 478         /*
 479          * Validate the handle
 480          * Although the handle is partially validated in acpi_ex_reconfiguration(),
 481          * when it calls acpi_ex_resolve_operands(), the handle is more completely
 482          * validated here.
 483          */
 484         if ((!ddb_handle) ||
 485             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
 486             (ACPI_GET_OBJECT_TYPE(ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
 487                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 488         }
 489
 490         /* Get the actual table descriptor from the ddb_handle */
 491
 492         table_info = (struct acpi_table_desc *)table_desc->reference.object;
 493
 494         /*
 495          * Delete the entire namespace under this table Node
 496          * (Offset contains the table_id)
 497          */
 498         acpi_ns_delete_namespace_by_owner(table_info->owner_id);
 499         acpi_ut_release_owner_id(&table_info->owner_id);
 500
 501         /* Delete the table itself */
 502
 503         (void)acpi_tb_uninstall_table(table_info->installed_desc);
 504
 505         /* Delete the table descriptor (ddb_handle) */
 506
 507         acpi_ut_remove_reference(table_desc);
 508         return_ACPI_STATUS(status);
 509 }