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 - 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         /* Install the new table into the local data structures */
 103
 104         ACPI_MEMSET (&table_info, 0, sizeof (struct acpi_table_desc));
 105
 106         table_info.type      = ACPI_TABLE_SSDT;
 107         table_info.pointer   = table;
 108         table_info.length    = (acpi_size) table->length;
 109         table_info.allocation = ACPI_MEM_ALLOCATED;
 110
 111         status = acpi_tb_install_table (&table_info);
 112         if (ACPI_FAILURE (status)) {
 113                 goto cleanup;
 114         }
 115
 116         /* Add the table to the namespace */
 117
 118         status = acpi_ns_load_table (table_info.installed_desc, parent_node);
 119         if (ACPI_FAILURE (status)) {
 120                 /* Uninstall table on error */
 121
 122                 (void) acpi_tb_uninstall_table (table_info.installed_desc);
 123                 goto cleanup;
 124         }
 125
 126         /* Init the table handle */
 127
 128         obj_desc->reference.opcode = AML_LOAD_OP;
 129         obj_desc->reference.object = table_info.installed_desc;
 130         *ddb_handle = obj_desc;
 131         return_ACPI_STATUS (AE_OK);
 132
 133
 134 cleanup:
 135         acpi_ut_remove_reference (obj_desc);
 136         return_ACPI_STATUS (status);
 137 }
 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 (
 155         struct acpi_walk_state          *walk_state,
 156         union acpi_operand_object       **return_desc)
 157 {
 158         acpi_status                     status;
 159         union acpi_operand_object       **operand = &walk_state->operands[0];
 160         struct acpi_table_header        *table;
 161         struct acpi_namespace_node      *parent_node;
 162         struct acpi_namespace_node      *start_node;
 163         struct acpi_namespace_node      *parameter_node = NULL;
 164         union acpi_operand_object       *ddb_handle;
 165
 166
 167         ACPI_FUNCTION_TRACE ("ex_load_table_op");
 168
 169
 170 #if 0
 171         /*
 172          * Make sure that the signature does not match one of the tables that
 173          * is already loaded.
 174          */
 175         status = acpi_tb_match_signature (operand[0]->string.pointer, NULL);
 176         if (status == AE_OK) {
 177                 /* Signature matched -- don't allow override */
 178
 179                 return_ACPI_STATUS (AE_ALREADY_EXISTS);
 180         }
 181 #endif
 182
 183         /* Find the ACPI table */
 184
 185         status = acpi_tb_find_table (operand[0]->string.pointer,
 186                            operand[1]->string.pointer,
 187                            operand[2]->string.pointer, &table);
 188         if (ACPI_FAILURE (status)) {
 189                 if (status != AE_NOT_FOUND) {
 190                         return_ACPI_STATUS (status);
 191                 }
 192
 193                 /* Table not found, return an Integer=0 and AE_OK */
 194
 195                 ddb_handle = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
 196                 if (!ddb_handle) {
 197                         return_ACPI_STATUS (AE_NO_MEMORY);
 198                 }
 199
 200                 ddb_handle->integer.value = 0;
 201                 *return_desc = ddb_handle;
 202
 203                 return_ACPI_STATUS (AE_OK);
 204         }
 205
 206         /* Default nodes */
 207
 208         start_node = walk_state->scope_info->scope.node;
 209         parent_node = acpi_gbl_root_node;
 210
 211         /* root_path (optional parameter) */
 212
 213         if (operand[3]->string.length > 0) {
 214                 /*
 215                  * Find the node referenced by the root_path_string. This is the
 216                  * location within the namespace where the table will be loaded.
 217                  */
 218                 status = acpi_ns_get_node_by_path (operand[3]->string.pointer, start_node,
 219                                    ACPI_NS_SEARCH_PARENT, &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 = acpi_ns_get_node_by_path (operand[4]->string.pointer, start_node,
 240                                  ACPI_NS_SEARCH_PARENT, &parameter_node);
 241                 if (ACPI_FAILURE (status)) {
 242                         return_ACPI_STATUS (status);
 243                 }
 244         }
 245
 246         /* Load the table into the namespace */
 247
 248         status = acpi_ex_add_table (table, parent_node, &ddb_handle);
 249         if (ACPI_FAILURE (status)) {
 250                 return_ACPI_STATUS (status);
 251         }
 252
 253         /* Parameter Data (optional) */
 254
 255         if (parameter_node) {
 256                 /* Store the parameter data into the optional parameter object */
 257
 258                 status = acpi_ex_store (operand[5],
 259                                  ACPI_CAST_PTR (union acpi_operand_object, 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  *
 274  * FUNCTION:    acpi_ex_load_op
 275  *
 276  * PARAMETERS:  obj_desc        - Region or Field where the table will be
 277  *                                obtained
 278  *              Target          - Where a handle to the table will be stored
 279  *              walk_state      - Current state
 280  *
 281  * RETURN:      Status
 282  *
 283  * DESCRIPTION: Load an ACPI table from a field or operation region
 284  *
 285  ******************************************************************************/
 286
 287 acpi_status
 288 acpi_ex_load_op (
 289         union acpi_operand_object       *obj_desc,
 290         union acpi_operand_object       *target,
 291         struct acpi_walk_state          *walk_state)
 292 {
 293         acpi_status                     status;
 294         union acpi_operand_object       *ddb_handle;
 295         union acpi_operand_object       *buffer_desc = NULL;
 296         struct acpi_table_header        *table_ptr = NULL;
 297         acpi_physical_address           address;
 298         struct acpi_table_header        table_header;
 299         u32                             i;
 300
 301         ACPI_FUNCTION_TRACE ("ex_load_op");
 302
 303
 304         /* Object can be either an op_region or a Field */
 305
 306         switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
 307         case ACPI_TYPE_REGION:
 308
 309                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Load from Region %p %s\n",
 310                         obj_desc, acpi_ut_get_object_type_name (obj_desc)));
 311
 312                 /*
 313                  * If the Region Address and Length have not been previously evaluated,
 314                  * evaluate them now and save the results.
 315                  */
 316                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 317                         status = acpi_ds_get_region_arguments (obj_desc);
 318                         if (ACPI_FAILURE (status)) {
 319                                 return_ACPI_STATUS (status);
 320                         }
 321                 }
 322
 323                 /* Get the base physical address of the region */
 324
 325                 address = obj_desc->region.address;
 326
 327                 /* Get the table length from the table header */
 328
 329                 table_header.length = 0;
 330                 for (i = 0; i < 8; i++) {
 331                         status = acpi_ev_address_space_dispatch (obj_desc, ACPI_READ,
 332                                            (acpi_physical_address) (i + address), 8,
 333                                            ((u8 *) &table_header) + i);
 334                         if (ACPI_FAILURE (status)) {
 335                                 return_ACPI_STATUS (status);
 336                         }
 337                 }
 338
 339                 /* Sanity check the table length */
 340
 341                 if (table_header.length < sizeof (struct acpi_table_header)) {
 342                         return_ACPI_STATUS (AE_BAD_HEADER);
 343                 }
 344
 345                 /* Allocate a buffer for the entire table */
 346
 347                 table_ptr = ACPI_MEM_ALLOCATE (table_header.length);
 348                 if (!table_ptr) {
 349                         return_ACPI_STATUS (AE_NO_MEMORY);
 350                 }
 351
 352                 /* Get the entire table from the op region */
 353
 354                 for (i = 0; i < table_header.length; i++) {
 355                         status = acpi_ev_address_space_dispatch (obj_desc, ACPI_READ,
 356                                            (acpi_physical_address) (i + address), 8,
 357                                            ((u8 *) table_ptr + i));
 358                         if (ACPI_FAILURE (status)) {
 359                                 goto cleanup;
 360                         }
 361                 }
 362                 break;
 363
 364
 365         case ACPI_TYPE_LOCAL_REGION_FIELD:
 366         case ACPI_TYPE_LOCAL_BANK_FIELD:
 367         case ACPI_TYPE_LOCAL_INDEX_FIELD:
 368
 369                 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Load from Field %p %s\n",
 370                         obj_desc, acpi_ut_get_object_type_name (obj_desc)));
 371
 372                 /*
 373                  * The length of the field must be at least as large as the table.
 374                  * Read the entire field and thus the entire table.  Buffer is
 375                  * allocated during the read.
 376                  */
 377                 status = acpi_ex_read_data_from_field (walk_state, obj_desc, &buffer_desc);
 378                 if (ACPI_FAILURE (status)) {
 379                         goto cleanup;
 380                 }
 381
 382                 table_ptr = ACPI_CAST_PTR (struct acpi_table_header,
 383                                   buffer_desc->buffer.pointer);
 384
 385                  /* Sanity check the table length */
 386
 387                 if (table_ptr->length < sizeof (struct acpi_table_header)) {
 388                         return_ACPI_STATUS (AE_BAD_HEADER);
 389                 }
 390                 break;
 391
 392
 393         default:
 394                 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 395         }
 396
 397         /* The table must be either an SSDT or a PSDT */
 398
 399         if ((!ACPI_STRNCMP (table_ptr->signature,
 400                           acpi_gbl_table_data[ACPI_TABLE_PSDT].signature,
 401                           acpi_gbl_table_data[ACPI_TABLE_PSDT].sig_length)) &&
 402                 (!ACPI_STRNCMP (table_ptr->signature,
 403                                  acpi_gbl_table_data[ACPI_TABLE_SSDT].signature,
 404                                  acpi_gbl_table_data[ACPI_TABLE_SSDT].sig_length))) {
 405                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 406                         "Table has invalid signature [%4.4s], must be SSDT or PSDT\n",
 407                         table_ptr->signature));
 408                 status = AE_BAD_SIGNATURE;
 409                 goto cleanup;
 410         }
 411
 412         /* Install the new table into the local data structures */
 413
 414         status = acpi_ex_add_table (table_ptr, acpi_gbl_root_node, &ddb_handle);
 415         if (ACPI_FAILURE (status)) {
 416                 goto cleanup;
 417         }
 418
 419         /* Store the ddb_handle into the Target operand */
 420
 421         status = acpi_ex_store (ddb_handle, target, walk_state);
 422         if (ACPI_FAILURE (status)) {
 423                 (void) acpi_ex_unload_table (ddb_handle);
 424         }
 425
 426         return_ACPI_STATUS (status);
 427
 428
 429 cleanup:
 430
 431         if (buffer_desc) {
 432                 acpi_ut_remove_reference (buffer_desc);
 433         }
 434         else {
 435                 ACPI_MEM_FREE (table_ptr);
 436         }
 437         return_ACPI_STATUS (status);
 438 }
 439
 440
 441 /*******************************************************************************
 442  *
 443  * FUNCTION:    acpi_ex_unload_table
 444  *
 445  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 446  *
 447  * RETURN:      Status
 448  *
 449  * DESCRIPTION: Unload an ACPI table
 450  *
 451  ******************************************************************************/
 452
 453 acpi_status
 454 acpi_ex_unload_table (
 455         union acpi_operand_object       *ddb_handle)
 456 {
 457         acpi_status                     status = AE_OK;
 458         union acpi_operand_object       *table_desc = ddb_handle;
 459         struct acpi_table_desc          *table_info;
 460
 461
 462         ACPI_FUNCTION_TRACE ("ex_unload_table");
 463
 464
 465         /*
 466          * Validate the handle
 467          * Although the handle is partially validated in acpi_ex_reconfiguration(),
 468          * when it calls acpi_ex_resolve_operands(), the handle is more completely
 469          * validated here.
 470          */
 471         if ((!ddb_handle) ||
 472                 (ACPI_GET_DESCRIPTOR_TYPE (ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
 473                 (ACPI_GET_OBJECT_TYPE (ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
 474                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 475         }
 476
 477         /* Get the actual table descriptor from the ddb_handle */
 478
 479         table_info = (struct acpi_table_desc *) table_desc->reference.object;
 480
 481         /*
 482          * Delete the entire namespace under this table Node
 483          * (Offset contains the table_id)
 484          */
 485         acpi_ns_delete_namespace_by_owner (table_info->table_id);
 486
 487         /* Delete the table itself */
 488
 489         (void) acpi_tb_uninstall_table (table_info->installed_desc);
 490
 491         /* Delete the table descriptor (ddb_handle) */
 492
 493         acpi_ut_remove_reference (table_desc);
 494         return_ACPI_STATUS (status);
 495 }
 496