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 - 2008, Intel Corp.
   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/actables.h>
  49 #include <acpi/acdispat.h>
  50
  51 #define _COMPONENT          ACPI_EXECUTER
  52 ACPI_MODULE_NAME("exconfig")
  53
  54 /* Local prototypes */
  55 static acpi_status
  56 acpi_ex_add_table(u32 table_index,
  57                   struct acpi_namespace_node *parent_node,
  58                   union acpi_operand_object **ddb_handle);
  59
  60 /*******************************************************************************
  61  *
  62  * FUNCTION:    acpi_ex_add_table
  63  *
  64  * PARAMETERS:  Table               - Pointer to raw table
  65  *              parent_node         - Where to load the table (scope)
  66  *              ddb_handle          - Where to return the table handle.
  67  *
  68  * RETURN:      Status
  69  *
  70  * DESCRIPTION: Common function to Install and Load an ACPI table with a
  71  *              returned table handle.
  72  *
  73  ******************************************************************************/
  74
  75 static acpi_status
  76 acpi_ex_add_table(u32 table_index,
  77                   struct acpi_namespace_node *parent_node,
  78                   union acpi_operand_object **ddb_handle)
  79 {
  80         acpi_status status;
  81         union acpi_operand_object *obj_desc;
  82
  83         ACPI_FUNCTION_TRACE(ex_add_table);
  84
  85         /* Create an object to be the table handle */
  86
  87         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
  88         if (!obj_desc) {
  89                 return_ACPI_STATUS(AE_NO_MEMORY);
  90         }
  91
  92         /* Init the table handle */
  93
  94         obj_desc->reference.opcode = AML_LOAD_OP;
  95         *ddb_handle = obj_desc;
  96
  97         /* Install the new table into the local data structures */
  98
  99         obj_desc->reference.object = ACPI_CAST_PTR(void,
 100                         (unsigned long)table_index);
 101
 102         /* Add the table to the namespace */
 103
 104         status = acpi_ns_load_table(table_index, parent_node);
 105         if (ACPI_FAILURE(status)) {
 106                 acpi_ut_remove_reference(obj_desc);
 107                 *ddb_handle = NULL;
 108         }
 109
 110         return_ACPI_STATUS(status);
 111 }
 112
 113 /*******************************************************************************
 114  *
 115  * FUNCTION:    acpi_ex_load_table_op
 116  *
 117  * PARAMETERS:  walk_state          - Current state with operands
 118  *              return_desc         - Where to store the return object
 119  *
 120  * RETURN:      Status
 121  *
 122  * DESCRIPTION: Load an ACPI table from the RSDT/XSDT
 123  *
 124  ******************************************************************************/
 125
 126 acpi_status
 127 acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
 128                       union acpi_operand_object **return_desc)
 129 {
 130         acpi_status status;
 131         union acpi_operand_object **operand = &walk_state->operands[0];
 132         struct acpi_namespace_node *parent_node;
 133         struct acpi_namespace_node *start_node;
 134         struct acpi_namespace_node *parameter_node = NULL;
 135         union acpi_operand_object *ddb_handle;
 136         struct acpi_table_header *table;
 137         u32 table_index;
 138
 139         ACPI_FUNCTION_TRACE(ex_load_table_op);
 140
 141         /* Validate lengths for the signature_string, OEMIDString, OEMtable_iD */
 142
 143         if ((operand[0]->string.length > ACPI_NAME_SIZE) ||
 144             (operand[1]->string.length > ACPI_OEM_ID_SIZE) ||
 145             (operand[2]->string.length > ACPI_OEM_TABLE_ID_SIZE)) {
 146                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 147         }
 148
 149         /* Find the ACPI table in the RSDT/XSDT */
 150
 151         status = acpi_tb_find_table(operand[0]->string.pointer,
 152                                     operand[1]->string.pointer,
 153                                     operand[2]->string.pointer, &table_index);
 154         if (ACPI_FAILURE(status)) {
 155                 if (status != AE_NOT_FOUND) {
 156                         return_ACPI_STATUS(status);
 157                 }
 158
 159                 /* Table not found, return an Integer=0 and AE_OK */
 160
 161                 ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 162                 if (!ddb_handle) {
 163                         return_ACPI_STATUS(AE_NO_MEMORY);
 164                 }
 165
 166                 ddb_handle->integer.value = 0;
 167                 *return_desc = ddb_handle;
 168
 169                 return_ACPI_STATUS(AE_OK);
 170         }
 171
 172         /* Default nodes */
 173
 174         start_node = walk_state->scope_info->scope.node;
 175         parent_node = acpi_gbl_root_node;
 176
 177         /* root_path (optional parameter) */
 178
 179         if (operand[3]->string.length > 0) {
 180                 /*
 181                  * Find the node referenced by the root_path_string. This is the
 182                  * location within the namespace where the table will be loaded.
 183                  */
 184                 status =
 185                     acpi_ns_get_node(start_node, operand[3]->string.pointer,
 186                                      ACPI_NS_SEARCH_PARENT, &parent_node);
 187                 if (ACPI_FAILURE(status)) {
 188                         return_ACPI_STATUS(status);
 189                 }
 190         }
 191
 192         /* parameter_path (optional parameter) */
 193
 194         if (operand[4]->string.length > 0) {
 195                 if ((operand[4]->string.pointer[0] != '\\') &&
 196                     (operand[4]->string.pointer[0] != '^')) {
 197                         /*
 198                          * Path is not absolute, so it will be relative to the node
 199                          * referenced by the root_path_string (or the NS root if omitted)
 200                          */
 201                         start_node = parent_node;
 202                 }
 203
 204                 /* Find the node referenced by the parameter_path_string */
 205
 206                 status =
 207                     acpi_ns_get_node(start_node, operand[4]->string.pointer,
 208                                      ACPI_NS_SEARCH_PARENT, &parameter_node);
 209                 if (ACPI_FAILURE(status)) {
 210                         return_ACPI_STATUS(status);
 211                 }
 212         }
 213
 214         /* Load the table into the namespace */
 215
 216         status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
 217         if (ACPI_FAILURE(status)) {
 218                 return_ACPI_STATUS(status);
 219         }
 220
 221         /* Parameter Data (optional) */
 222
 223         if (parameter_node) {
 224
 225                 /* Store the parameter data into the optional parameter object */
 226
 227                 status = acpi_ex_store(operand[5],
 228                                        ACPI_CAST_PTR(union acpi_operand_object,
 229                                                      parameter_node),
 230                                        walk_state);
 231                 if (ACPI_FAILURE(status)) {
 232                         (void)acpi_ex_unload_table(ddb_handle);
 233                         return_ACPI_STATUS(status);
 234                 }
 235         }
 236
 237         status = acpi_get_table_by_index(table_index, &table);
 238         if (ACPI_SUCCESS(status)) {
 239                 ACPI_INFO((AE_INFO,
 240                            "Dynamic OEM Table Load - [%.4s] OemId [%.6s] OemTableId [%.8s]",
 241                            table->signature, table->oem_id,
 242                            table->oem_table_id));
 243         }
 244
 245         /* Invoke table handler if present */
 246
 247         if (acpi_gbl_table_handler) {
 248                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 249                                              acpi_gbl_table_handler_context);
 250         }
 251
 252         *return_desc = ddb_handle;
 253         return_ACPI_STATUS(status);
 254 }
 255
 256 /*******************************************************************************
 257  *
 258  * FUNCTION:    acpi_ex_load_op
 259  *
 260  * PARAMETERS:  obj_desc        - Region or Buffer/Field where the table will be
 261  *                                obtained
 262  *              Target          - Where a handle to the table will be stored
 263  *              walk_state      - Current state
 264  *
 265  * RETURN:      Status
 266  *
 267  * DESCRIPTION: Load an ACPI table from a field or operation region
 268  *
 269  * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
 270  *       objects before this code is reached.
 271  *
 272  *       If source is an operation region, it must refer to system_memory, as
 273  *       per the ACPI specification.
 274  *
 275  ******************************************************************************/
 276
 277 acpi_status
 278 acpi_ex_load_op(union acpi_operand_object *obj_desc,
 279                 union acpi_operand_object *target,
 280                 struct acpi_walk_state *walk_state)
 281 {
 282         union acpi_operand_object *ddb_handle;
 283         struct acpi_table_desc table_desc;
 284         u32 table_index;
 285         acpi_status status;
 286         u32 length;
 287
 288         ACPI_FUNCTION_TRACE(ex_load_op);
 289
 290         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
 291
 292         /* Source Object can be either an op_region or a Buffer/Field */
 293
 294         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 295         case ACPI_TYPE_REGION:
 296
 297                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Region %p %s\n",
 298                                   obj_desc,
 299                                   acpi_ut_get_object_type_name(obj_desc)));
 300
 301                 /* Region must be system_memory (from ACPI spec) */
 302
 303                 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
 304                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 305                 }
 306
 307                 /*
 308                  * If the Region Address and Length have not been previously evaluated,
 309                  * evaluate them now and save the results.
 310                  */
 311                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 312                         status = acpi_ds_get_region_arguments(obj_desc);
 313                         if (ACPI_FAILURE(status)) {
 314                                 return_ACPI_STATUS(status);
 315                         }
 316                 }
 317
 318                 /*
 319                  * We will simply map the memory region for the table. However, the
 320                  * memory region is technically not guaranteed to remain stable and
 321                  * we may eventually have to copy the table to a local buffer.
 322                  */
 323                 table_desc.address = obj_desc->region.address;
 324                 table_desc.length = obj_desc->region.length;
 325                 table_desc.flags = ACPI_TABLE_ORIGIN_MAPPED;
 326                 break;
 327
 328         case ACPI_TYPE_BUFFER:  /* Buffer or resolved region_field */
 329
 330                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 331                                   "Load from Buffer or Field %p %s\n", obj_desc,
 332                                   acpi_ut_get_object_type_name(obj_desc)));
 333
 334                 length = obj_desc->buffer.length;
 335
 336                 /* Must have at least an ACPI table header */
 337
 338                 if (length < sizeof(struct acpi_table_header)) {
 339                         return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
 340                 }
 341
 342                 /* Validate checksum here. It won't get validated in tb_add_table */
 343
 344                 status =
 345                     acpi_tb_verify_checksum(ACPI_CAST_PTR
 346                                             (struct acpi_table_header,
 347                                              obj_desc->buffer.pointer), length);
 348                 if (ACPI_FAILURE(status)) {
 349                         return_ACPI_STATUS(status);
 350                 }
 351
 352                 /*
 353                  * We need to copy the buffer since the original buffer could be
 354                  * changed or deleted in the future
 355                  */
 356                 table_desc.pointer = ACPI_ALLOCATE(length);
 357                 if (!table_desc.pointer) {
 358                         return_ACPI_STATUS(AE_NO_MEMORY);
 359                 }
 360
 361                 ACPI_MEMCPY(table_desc.pointer, obj_desc->buffer.pointer,
 362                             length);
 363                 table_desc.length = length;
 364                 table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;
 365                 break;
 366
 367         default:
 368                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 369         }
 370
 371         /*
 372          * Install the new table into the local data structures
 373          */
 374         status = acpi_tb_add_table(&table_desc, &table_index);
 375         if (ACPI_FAILURE(status)) {
 376                 goto cleanup;
 377         }
 378
 379         /*
 380          * Add the table to the namespace.
 381          *
 382          * Note: We load the table objects relative to the root of the namespace.
 383          * This appears to go against the ACPI specification, but we do it for
 384          * compatibility with other ACPI implementations.
 385          */
 386         status =
 387             acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
 388         if (ACPI_FAILURE(status)) {
 389
 390                 /* On error, table_ptr was deallocated above */
 391
 392                 return_ACPI_STATUS(status);
 393         }
 394
 395         /* Store the ddb_handle into the Target operand */
 396
 397         status = acpi_ex_store(ddb_handle, target, walk_state);
 398         if (ACPI_FAILURE(status)) {
 399                 (void)acpi_ex_unload_table(ddb_handle);
 400
 401                 /* table_ptr was deallocated above */
 402
 403                 acpi_ut_remove_reference(ddb_handle);
 404                 return_ACPI_STATUS(status);
 405         }
 406
 407         /* Invoke table handler if present */
 408
 409         if (acpi_gbl_table_handler) {
 410                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD,
 411                                              table_desc.pointer,
 412                                              acpi_gbl_table_handler_context);
 413         }
 414
 415       cleanup:
 416         if (ACPI_FAILURE(status)) {
 417
 418                 /* Delete allocated buffer or mapping */
 419
 420                 acpi_tb_delete_table(&table_desc);
 421         }
 422         return_ACPI_STATUS(status);
 423 }
 424
 425 /*******************************************************************************
 426  *
 427  * FUNCTION:    acpi_ex_unload_table
 428  *
 429  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 430  *
 431  * RETURN:      Status
 432  *
 433  * DESCRIPTION: Unload an ACPI table
 434  *
 435  ******************************************************************************/
 436
 437 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 438 {
 439         acpi_status status = AE_OK;
 440         union acpi_operand_object *table_desc = ddb_handle;
 441         u32 table_index;
 442         struct acpi_table_header *table;
 443
 444         ACPI_FUNCTION_TRACE(ex_unload_table);
 445
 446         /*
 447          * Validate the handle
 448          * Although the handle is partially validated in acpi_ex_reconfiguration(),
 449          * when it calls acpi_ex_resolve_operands(), the handle is more completely
 450          * validated here.
 451          */
 452         if ((!ddb_handle) ||
 453             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
 454             (ACPI_GET_OBJECT_TYPE(ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
 455                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 456         }
 457
 458         /* Get the table index from the ddb_handle (acpi_size for 64-bit case) */
 459
 460         table_index = (u32) (acpi_size) table_desc->reference.object;
 461
 462         /* Invoke table handler if present */
 463
 464         if (acpi_gbl_table_handler) {
 465                 status = acpi_get_table_by_index(table_index, &table);
 466                 if (ACPI_SUCCESS(status)) {
 467                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 468                                                      table,
 469                                                      acpi_gbl_table_handler_context);
 470                 }
 471         }
 472
 473         /*
 474          * Delete the entire namespace under this table Node
 475          * (Offset contains the table_id)
 476          */
 477         acpi_tb_delete_namespace_by_owner(table_index);
 478         (void)acpi_tb_release_owner_id(table_index);
 479
 480         acpi_tb_set_table_loaded_flag(table_index, FALSE);
 481
 482         return_ACPI_STATUS(AE_OK);
 483 }