err.no 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 - 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/acinterp.h>
  47 #include <acpi/amlcode.h>
  48 #include <acpi/acnamesp.h>
  49 #include <acpi/acevents.h>
  50 #include <acpi/actables.h>
  51 #include <acpi/acdispat.h>
  52
  53
  54 #define _COMPONENT          ACPI_EXECUTER
  55          ACPI_MODULE_NAME    ("exconfig")
  56
  57 /* Local prototypes */
  58
  59 static acpi_status
  60 acpi_ex_add_table (
  61         struct acpi_table_header        *table,
  62         struct acpi_namespace_node      *parent_node,
  63         union acpi_operand_object       **ddb_handle);
  64
  65
  66 /*******************************************************************************
  67  *
  68  * FUNCTION:    acpi_ex_add_table
  69  *
  70  * PARAMETERS:  Table               - Pointer to raw table
  71  *              parent_node         - Where to load the table (scope)
  72  *              ddb_handle          - Where to return the table handle.
  73  *
  74  * RETURN:      Status
  75  *
  76  * DESCRIPTION: Common function to Install and Load an ACPI table with a
  77  *              returned table handle.
  78  *
  79  ******************************************************************************/
  80
  81 static acpi_status
  82 acpi_ex_add_table (
  83         struct acpi_table_header        *table,
  84         struct acpi_namespace_node      *parent_node,
  85         union acpi_operand_object       **ddb_handle)
  86 {
  87         acpi_status                     status;
  88         struct acpi_table_desc          table_info;
  89         union acpi_operand_object       *obj_desc;
  90
  91
  92         ACPI_FUNCTION_TRACE ("ex_add_table");
  93
  94
  95         /* Create an object to be the table handle */
  96
  97         obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_REFERENCE);
  98         if (!obj_desc) {
  99                 return_ACPI_STATUS (AE_NO_MEMORY);
 100         }
 101
 102         /* Init the table handle */
 103
 104         obj_desc->reference.opcode = AML_LOAD_OP;
 105         *ddb_handle = obj_desc;
 106
 107         /* Install the new table into the local data structures */
 108
 109         ACPI_MEMSET (&table_info, 0, sizeof (struct acpi_table_desc));
 110
 111         table_info.type      = ACPI_TABLE_SSDT;
 112         table_info.pointer   = table;
 113         table_info.length    = (acpi_size) table->length;
 114         table_info.allocation = ACPI_MEM_ALLOCATED;
 115
 116         status = acpi_tb_install_table (&table_info);
 117         obj_desc->reference.object = table_info.installed_desc;
 118
 119         if (ACPI_FAILURE (status)) {
 120                 if (status == AE_ALREADY_EXISTS) {
 121                         /* Table already exists, just return the handle */
 122
 123                         return_ACPI_STATUS (AE_OK);
 124                 }
 125                 goto cleanup;
 126         }
 127
 128         /* Add the table to the namespace */
 129
 130         status = acpi_ns_load_table (table_info.installed_desc, parent_node);
 131         if (ACPI_FAILURE (status)) {
 132                 /* Uninstall table on error */
 133
 134                 (void) acpi_tb_uninstall_table (table_info.installed_desc);
 135                 goto cleanup;
 136         }
 137
 138         return_ACPI_STATUS (AE_OK);
 139
 140
 141 cleanup:
 142         acpi_ut_remove_reference (obj_desc);
 143         *ddb_handle = NULL;
 144         return_ACPI_STATUS (status);
 145 }
 146
 147
 148 /*******************************************************************************
 149  *
 150  * FUNCTION:    acpi_ex_load_table_op
 151  *
 152  * PARAMETERS:  walk_state          - Current state with operands
 153  *              return_desc         - Where to store the return object
 154  *
 155  * RETURN:      Status
 156  *
 157  * DESCRIPTION: Load an ACPI table
 158  *
 159  ******************************************************************************/
 160
 161 acpi_status
 162 acpi_ex_load_table_op (
 163         struct acpi_walk_state          *walk_state,
 164         union acpi_operand_object       **return_desc)
 165 {
 166         acpi_status                     status;
 167         union acpi_operand_object       **operand = &walk_state->operands[0];
 168         struct acpi_table_header        *table;
 169         struct acpi_namespace_node      *parent_node;
 170         struct acpi_namespace_node      *start_node;
 171         struct acpi_namespace_node      *parameter_node = NULL;
 172         union acpi_operand_object       *ddb_handle;
 173
 174
 175         ACPI_FUNCTION_TRACE ("ex_load_table_op");
 176
 177
 178 #if 0
 179         /*
 180          * Make sure that the signature does not match one of the tables that
 181          * is already loaded.
 182          */
 183         status = acpi_tb_match_signature (operand[0]->string.pointer, NULL);
 184         if (status == AE_OK) {
 185                 /* Signature matched -- don't allow override */
 186
 187                 return_ACPI_STATUS (AE_ALREADY_EXISTS);
 188         }
 189 #endif
 190
 191         /* Find the ACPI table */
 192
 193         status = acpi_tb_find_table (operand[0]->string.pointer,
 194                            operand[1]->string.pointer,
 195                            operand[2]->string.pointer, &table);
 196         if (ACPI_FAILURE (status)) {
 197                 if (status != AE_NOT_FOUND) {
 198                         return_ACPI_STATUS (status);
 199                 }
 200
 201                 /* Table not found, return an Integer=0 and AE_OK */
 202
 203                 ddb_handle = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
 204                 if (!ddb_handle) {
 205                         return_ACPI_STATUS (AE_NO_MEMORY);
 206                 }
 207
 208                 ddb_handle->integer.value = 0;
 209                 *return_desc = ddb_handle;
 210
 211                 return_ACPI_STATUS (AE_OK);
 212         }
 213
 214         /* Default nodes */
 215
 216         start_node = walk_state->scope_info->scope.node;
 217         parent_node = acpi_gbl_root_node;
 218
 219         /* root_path (optional parameter) */
 220
 221         if (operand[3]->string.length > 0) {
 222                 /*
 223                  * Find the node referenced by the root_path_string. This is the
 224                  * location within the namespace where the table will be loaded.
 225                  */
 226                 status = acpi_ns_get_node_by_path (operand[3]->string.pointer, start_node,
 227                                    ACPI_NS_SEARCH_PARENT, &parent_node);
 228                 if (ACPI_FAILURE (status)) {
 229                         return_ACPI_STATUS (status);
 230                 }
 231         }
 232
 233         /* parameter_path (optional parameter) */
 234
 235         if (operand[4]->string.length > 0) {
 236                 if ((operand[4]->string.pointer[0] != '\\') &&
 237                         (operand[4]->string.pointer[0] != '^')) {
 238                         /*
 239                          * Path is not absolute, so it will be relative to the node
 240                          * referenced by the root_path_string (or the NS root if omitted)
 241                          */
 242                         start_node = parent_node;
 243                 }
 244
 245                 /* Find the node referenced by the parameter_path_string */
 246
 247                 status = acpi_ns_get_node_by_path (operand[4]->string.pointer, start_node,
 248                                  ACPI_NS_SEARCH_PARENT, &parameter_node);
 249                 if (ACPI_FAILURE (status)) {
 250                         return_ACPI_STATUS (status);
 251                 }
 252         }
 253
 254         /* Load the table into the namespace */
 255
 256         status = acpi_ex_add_table (table, parent_node, &ddb_handle);
 257         if (ACPI_FAILURE (status)) {
 258                 return_ACPI_STATUS (status);
 259         }
 260
 261         /* Parameter Data (optional) */
 262
 263         if (parameter_node) {
 264                 /* Store the parameter data into the optional parameter object */
 265
 266                 status = acpi_ex_store (operand[5],
 267                                  ACPI_CAST_PTR (union acpi_operand_object, parameter_node),
 268                                  walk_state);
 269                 if (ACPI_FAILURE (status)) {
 270                         (void) acpi_ex_unload_table (ddb_handle);
 271                         return_ACPI_STATUS (status);
 272                 }
 273         }
 274
 275         *return_desc = ddb_handle;
 276         return_ACPI_STATUS  (status);
 277 }
 278
 279
 280 /*******************************************************************************
 281  *
 282  * FUNCTION:    acpi_ex_load_op
 283  *
 284  * PARAMETERS:  obj_desc        - Region or Field where the table will be
 285  *                                obtained
 286  *              Target          - Where a handle to the table will be stored
 287  *              walk_state      - Current state
 288  *
 289  * RETURN:      Status
 290  *
 291  * DESCRIPTION: Load an ACPI table from a field or operation region
 292  *
 293  ******************************************************************************/
 294
 295 acpi_status
 296 acpi_ex_load_op (
 297         union acpi_operand_object       *obj_desc,
 298         union acpi_operand_object       *target,
 299         struct acpi_walk_state          *walk_state)
 300 {
 301         acpi_status                     status;
 302         union acpi_operand_object       *ddb_handle;
 303         union acpi_operand_object       *buffer_desc = NULL;
 304         struct acpi_table_header        *table_ptr = NULL;
 305         acpi_physical_address           address;
 306         struct acpi_table_header        table_header;
 307         u32                             i;
 308
 309         ACPI_FUNCTION_TRACE ("ex_load_op");
 310
 311
 312         /* Object can be either an op_region or a Field */
 313
 314         switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
 315         case ACPI_TYPE_REGION:
 316
 317                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Load from Region %p %s\n",
 318                         obj_desc, acpi_ut_get_object_type_name (obj_desc)));
 319
 320                 /*
 321                  * If the Region Address and Length have not been previously evaluated,
 322                  * evaluate them now and save the results.
 323                  */
 324                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 325                         status = acpi_ds_get_region_arguments (obj_desc);
 326                         if (ACPI_FAILURE (status)) {
 327                                 return_ACPI_STATUS (status);
 328                         }
 329                 }
 330
 331                 /* Get the base physical address of the region */
 332
 333                 address = obj_desc->region.address;
 334
 335                 /* Get the table length from the table header */
 336
 337                 table_header.length = 0;
 338                 for (i = 0; i < 8; i++) {
 339                         status = acpi_ev_address_space_dispatch (obj_desc, ACPI_READ,
 340                                            (acpi_physical_address) (i + address), 8,
 341                                            ((u8 *) &table_header) + i);
 342                         if (ACPI_FAILURE (status)) {
 343                                 return_ACPI_STATUS (status);
 344                         }
 345                 }
 346
 347                 /* Sanity check the table length */
 348
 349                 if (table_header.length < sizeof (struct acpi_table_header)) {
 350                         return_ACPI_STATUS (AE_BAD_HEADER);
 351                 }
 352
 353                 /* Allocate a buffer for the entire table */
 354
 355                 table_ptr = ACPI_MEM_ALLOCATE (table_header.length);
 356                 if (!table_ptr) {
 357                         return_ACPI_STATUS (AE_NO_MEMORY);
 358                 }
 359
 360                 /* Get the entire table from the op region */
 361
 362                 for (i = 0; i < table_header.length; i++) {
 363                         status = acpi_ev_address_space_dispatch (obj_desc, ACPI_READ,
 364                                            (acpi_physical_address) (i + address), 8,
 365                                            ((u8 *) table_ptr + i));
 366                         if (ACPI_FAILURE (status)) {
 367                                 goto cleanup;
 368                         }
 369                 }
 370                 break;
 371
 372
 373         case ACPI_TYPE_LOCAL_REGION_FIELD:
 374         case ACPI_TYPE_LOCAL_BANK_FIELD:
 375         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 376
 377                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Load from Field %p %s\n",
 378                         obj_desc, acpi_ut_get_object_type_name (obj_desc)));
 379
 380                 /*
 381                  * The length of the field must be at least as large as the table.
 382                  * Read the entire field and thus the entire table.  Buffer is
 383                  * allocated during the read.
 384                  */
 385                 status = acpi_ex_read_data_from_field (walk_state, obj_desc, &buffer_desc);
 386                 if (ACPI_FAILURE (status)) {
 387                         return_ACPI_STATUS (status);
 388                 }
 389
 390                 table_ptr = ACPI_CAST_PTR (struct acpi_table_header,
 391                                   buffer_desc->buffer.pointer);
 392
 393                 /* All done with the buffer_desc, delete it */
 394
 395                 buffer_desc->buffer.pointer = NULL;
 396                 acpi_ut_remove_reference (buffer_desc);
 397
 398                 /* Sanity check the table length */
 399
 400                 if (table_ptr->length < sizeof (struct acpi_table_header)) {
 401                         status = AE_BAD_HEADER;
 402                         goto cleanup;
 403                 }
 404                 break;
 405
 406
 407         default:
 408                 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 409         }
 410
 411         /* The table must be either an SSDT or a PSDT */
 412
 413         if ((!ACPI_STRNCMP (table_ptr->signature,
 414                           acpi_gbl_table_data[ACPI_TABLE_PSDT].signature,
 415                           acpi_gbl_table_data[ACPI_TABLE_PSDT].sig_length)) &&
 416                 (!ACPI_STRNCMP (table_ptr->signature,
 417                                  acpi_gbl_table_data[ACPI_TABLE_SSDT].signature,
 418                                  acpi_gbl_table_data[ACPI_TABLE_SSDT].sig_length))) {
 419                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 420                         "Table has invalid signature [%4.4s], must be SSDT or PSDT\n",
 421                         table_ptr->signature));
 422                 status = AE_BAD_SIGNATURE;
 423                 goto cleanup;
 424         }
 425
 426         /* Install the new table into the local data structures */
 427
 428         status = acpi_ex_add_table (table_ptr, acpi_gbl_root_node, &ddb_handle);
 429         if (ACPI_FAILURE (status)) {
 430                 /* On error, table_ptr was deallocated above */
 431
 432                 return_ACPI_STATUS (status);
 433         }
 434
 435         /* Store the ddb_handle into the Target operand */
 436
 437         status = acpi_ex_store (ddb_handle, target, walk_state);
 438         if (ACPI_FAILURE (status)) {
 439                 (void) acpi_ex_unload_table (ddb_handle);
 440
 441                 /* table_ptr was deallocated above */
 442
 443                 return_ACPI_STATUS (status);
 444         }
 445
 446 cleanup:
 447         if (ACPI_FAILURE (status)) {
 448                 ACPI_MEM_FREE (table_ptr);
 449         }
 450         return_ACPI_STATUS (status);
 451 }
 452
 453
 454 /*******************************************************************************
 455  *
 456  * FUNCTION:    acpi_ex_unload_table
 457  *
 458  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 459  *
 460  * RETURN:      Status
 461  *
 462  * DESCRIPTION: Unload an ACPI table
 463  *
 464  ******************************************************************************/
 465
 466 acpi_status
 467 acpi_ex_unload_table (
 468         union acpi_operand_object       *ddb_handle)
 469 {
 470         acpi_status                     status = AE_OK;
 471         union acpi_operand_object       *table_desc = ddb_handle;
 472         struct acpi_table_desc          *table_info;
 473
 474
 475         ACPI_FUNCTION_TRACE ("ex_unload_table");
 476
 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 }
 510