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