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 - 2007, 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(acpi_native_uint table_index,
  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(acpi_native_uint table_index,
  78                   struct acpi_namespace_node *parent_node,
  79                   union acpi_operand_object **ddb_handle)
  80 {
  81         acpi_status status;
  82         union acpi_operand_object *obj_desc;
  83
  84         ACPI_FUNCTION_TRACE(ex_add_table);
  85
  86         /* Create an object to be the table handle */
  87
  88         obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
  89         if (!obj_desc) {
  90                 return_ACPI_STATUS(AE_NO_MEMORY);
  91         }
  92
  93         /* Init the table handle */
  94
  95         obj_desc->reference.opcode = AML_LOAD_OP;
  96         *ddb_handle = obj_desc;
  97
  98         /* Install the new table into the local data structures */
  99
 100         obj_desc->reference.object = ACPI_CAST_PTR(void, 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         acpi_native_uint table_index;
 133         struct acpi_namespace_node *parent_node;
 134         struct acpi_namespace_node *start_node;
 135         struct acpi_namespace_node *parameter_node = NULL;
 136         union acpi_operand_object *ddb_handle;
 137         struct acpi_table_header *table;
 138
 139         ACPI_FUNCTION_TRACE(ex_load_table_op);
 140
 141         /* Find the ACPI table in the RSDT/XSDT */
 142
 143         status = acpi_tb_find_table(operand[0]->string.pointer,
 144                                     operand[1]->string.pointer,
 145                                     operand[2]->string.pointer, &table_index);
 146         if (ACPI_FAILURE(status)) {
 147                 if (status != AE_NOT_FOUND) {
 148                         return_ACPI_STATUS(status);
 149                 }
 150
 151                 /* Table not found, return an Integer=0 and AE_OK */
 152
 153                 ddb_handle = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 154                 if (!ddb_handle) {
 155                         return_ACPI_STATUS(AE_NO_MEMORY);
 156                 }
 157
 158                 ddb_handle->integer.value = 0;
 159                 *return_desc = ddb_handle;
 160
 161                 return_ACPI_STATUS(AE_OK);
 162         }
 163
 164         /* Default nodes */
 165
 166         start_node = walk_state->scope_info->scope.node;
 167         parent_node = acpi_gbl_root_node;
 168
 169         /* root_path (optional parameter) */
 170
 171         if (operand[3]->string.length > 0) {
 172                 /*
 173                  * Find the node referenced by the root_path_string. This is the
 174                  * location within the namespace where the table will be loaded.
 175                  */
 176                 status =
 177                     acpi_ns_get_node(start_node, operand[3]->string.pointer,
 178                                      ACPI_NS_SEARCH_PARENT, &parent_node);
 179                 if (ACPI_FAILURE(status)) {
 180                         return_ACPI_STATUS(status);
 181                 }
 182         }
 183
 184         /* parameter_path (optional parameter) */
 185
 186         if (operand[4]->string.length > 0) {
 187                 if ((operand[4]->string.pointer[0] != '\\') &&
 188                     (operand[4]->string.pointer[0] != '^')) {
 189                         /*
 190                          * Path is not absolute, so it will be relative to the node
 191                          * referenced by the root_path_string (or the NS root if omitted)
 192                          */
 193                         start_node = parent_node;
 194                 }
 195
 196                 /* Find the node referenced by the parameter_path_string */
 197
 198                 status =
 199                     acpi_ns_get_node(start_node, operand[4]->string.pointer,
 200                                      ACPI_NS_SEARCH_PARENT, &parameter_node);
 201                 if (ACPI_FAILURE(status)) {
 202                         return_ACPI_STATUS(status);
 203                 }
 204         }
 205
 206         /* Load the table into the namespace */
 207
 208         status = acpi_ex_add_table(table_index, parent_node, &ddb_handle);
 209         if (ACPI_FAILURE(status)) {
 210                 return_ACPI_STATUS(status);
 211         }
 212
 213         /* Parameter Data (optional) */
 214
 215         if (parameter_node) {
 216
 217                 /* Store the parameter data into the optional parameter object */
 218
 219                 status = acpi_ex_store(operand[5],
 220                                        ACPI_CAST_PTR(union acpi_operand_object,
 221                                                      parameter_node),
 222                                        walk_state);
 223                 if (ACPI_FAILURE(status)) {
 224                         (void)acpi_ex_unload_table(ddb_handle);
 225                         return_ACPI_STATUS(status);
 226                 }
 227         }
 228
 229         status = acpi_get_table_by_index(table_index, &table);
 230         if (ACPI_SUCCESS(status)) {
 231                 ACPI_INFO((AE_INFO,
 232                            "Dynamic OEM Table Load - [%4.4s] OemId [%6.6s] OemTableId [%8.8s]",
 233                            table->signature, table->oem_id,
 234                            table->oem_table_id));
 235         }
 236
 237         *return_desc = ddb_handle;
 238         return_ACPI_STATUS(status);
 239 }
 240
 241 /*******************************************************************************
 242  *
 243  * FUNCTION:    acpi_ex_load_op
 244  *
 245  * PARAMETERS:  obj_desc        - Region or Buffer/Field where the table will be
 246  *                                obtained
 247  *              Target          - Where a handle to the table will be stored
 248  *              walk_state      - Current state
 249  *
 250  * RETURN:      Status
 251  *
 252  * DESCRIPTION: Load an ACPI table from a field or operation region
 253  *
 254  * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
 255  *       objects before this code is reached.
 256  *
 257  *       If source is an operation region, it must refer to system_memory, as
 258  *       per the ACPI specification.
 259  *
 260  ******************************************************************************/
 261
 262 acpi_status
 263 acpi_ex_load_op(union acpi_operand_object *obj_desc,
 264                 union acpi_operand_object *target,
 265                 struct acpi_walk_state *walk_state)
 266 {
 267         union acpi_operand_object *ddb_handle;
 268         struct acpi_table_desc table_desc;
 269         acpi_native_uint table_index;
 270         acpi_status status;
 271
 272         ACPI_FUNCTION_TRACE(ex_load_op);
 273
 274         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
 275
 276         /* Source Object can be either an op_region or a Buffer/Field */
 277
 278         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 279         case ACPI_TYPE_REGION:
 280
 281                 /* Region must be system_memory (from ACPI spec) */
 282
 283                 if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
 284                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 285                 }
 286
 287                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Load from Region %p %s\n",
 288                                   obj_desc,
 289                                   acpi_ut_get_object_type_name(obj_desc)));
 290
 291                 /*
 292                  * If the Region Address and Length have not been previously evaluated,
 293                  * evaluate them now and save the results.
 294                  */
 295                 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
 296                         status = acpi_ds_get_region_arguments(obj_desc);
 297                         if (ACPI_FAILURE(status)) {
 298                                 return_ACPI_STATUS(status);
 299                         }
 300                 }
 301
 302                 table_desc.address = obj_desc->region.address;
 303                 table_desc.length = obj_desc->region.length;
 304                 table_desc.flags = ACPI_TABLE_ORIGIN_MAPPED;
 305                 break;
 306
 307         case ACPI_TYPE_BUFFER:  /* Buffer or resolved region_field */
 308
 309                 /* Simply extract the buffer from the buffer object */
 310
 311                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 312                                   "Load from Buffer or Field %p %s\n", obj_desc,
 313                                   acpi_ut_get_object_type_name(obj_desc)));
 314
 315                 table_desc.pointer = ACPI_CAST_PTR(struct acpi_table_header,
 316                                                    obj_desc->buffer.pointer);
 317                 table_desc.length = table_desc.pointer->length;
 318                 table_desc.flags = ACPI_TABLE_ORIGIN_ALLOCATED;
 319
 320                 obj_desc->buffer.pointer = NULL;
 321                 break;
 322
 323         default:
 324                 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 325         }
 326
 327         /*
 328          * Install the new table into the local data structures
 329          */
 330         status = acpi_tb_add_table(&table_desc, &table_index);
 331         if (ACPI_FAILURE(status)) {
 332                 goto cleanup;
 333         }
 334
 335         status =
 336             acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle);
 337         if (ACPI_FAILURE(status)) {
 338
 339                 /* On error, table_ptr was deallocated above */
 340
 341                 return_ACPI_STATUS(status);
 342         }
 343
 344         /* Store the ddb_handle into the Target operand */
 345
 346         status = acpi_ex_store(ddb_handle, target, walk_state);
 347         if (ACPI_FAILURE(status)) {
 348                 (void)acpi_ex_unload_table(ddb_handle);
 349
 350                 /* table_ptr was deallocated above */
 351
 352                 return_ACPI_STATUS(status);
 353         }
 354
 355       cleanup:
 356         if (ACPI_FAILURE(status)) {
 357                 acpi_tb_delete_table(&table_desc);
 358         }
 359         return_ACPI_STATUS(status);
 360 }
 361
 362 /*******************************************************************************
 363  *
 364  * FUNCTION:    acpi_ex_unload_table
 365  *
 366  * PARAMETERS:  ddb_handle          - Handle to a previously loaded table
 367  *
 368  * RETURN:      Status
 369  *
 370  * DESCRIPTION: Unload an ACPI table
 371  *
 372  ******************************************************************************/
 373
 374 acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
 375 {
 376         acpi_status status = AE_OK;
 377         union acpi_operand_object *table_desc = ddb_handle;
 378         acpi_native_uint table_index;
 379
 380         ACPI_FUNCTION_TRACE(ex_unload_table);
 381
 382         /*
 383          * Validate the handle
 384          * Although the handle is partially validated in acpi_ex_reconfiguration(),
 385          * when it calls acpi_ex_resolve_operands(), the handle is more completely
 386          * validated here.
 387          */
 388         if ((!ddb_handle) ||
 389             (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
 390             (ACPI_GET_OBJECT_TYPE(ddb_handle) != ACPI_TYPE_LOCAL_REFERENCE)) {
 391                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 392         }
 393
 394         /* Get the table index from the ddb_handle */
 395
 396         table_index = (acpi_native_uint) table_desc->reference.object;
 397
 398         /*
 399          * Delete the entire namespace under this table Node
 400          * (Offset contains the table_id)
 401          */
 402         acpi_tb_delete_namespace_by_owner(table_index);
 403         acpi_tb_release_owner_id(table_index);
 404
 405         acpi_tb_set_table_loaded_flag(table_index, FALSE);
 406
 407         /* Delete the table descriptor (ddb_handle) */
 408
 409         acpi_ut_remove_reference(table_desc);
 410         return_ACPI_STATUS(status);
 411 }