| 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes) |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
| 8 | * Copyright (C) 2000 - 2015, 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 "accommon.h" |
| 46 | #include "acinterp.h" |
| 47 | #include "acnamesp.h" |
| 48 | #include "actables.h" |
| 49 | #include "acdispat.h" |
| 50 | #include "acevents.h" |
| 51 | #include "amlcode.h" |
| 52 | |
| 53 | #define _COMPONENT ACPI_EXECUTER |
| 54 | ACPI_MODULE_NAME("exconfig") |
| 55 | |
| 56 | /* Local prototypes */ |
| 57 | static acpi_status |
| 58 | acpi_ex_add_table(u32 table_index, |
| 59 | struct acpi_namespace_node *parent_node, |
| 60 | union acpi_operand_object **ddb_handle); |
| 61 | |
| 62 | static acpi_status |
| 63 | acpi_ex_region_read(union acpi_operand_object *obj_desc, |
| 64 | u32 length, u8 *buffer); |
| 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(u32 table_index, |
| 83 | struct acpi_namespace_node *parent_node, |
| 84 | union acpi_operand_object **ddb_handle) |
| 85 | { |
| 86 | union acpi_operand_object *obj_desc; |
| 87 | acpi_status status; |
| 88 | acpi_owner_id owner_id; |
| 89 | |
| 90 | ACPI_FUNCTION_TRACE(ex_add_table); |
| 91 | |
| 92 | /* Create an object to be the table handle */ |
| 93 | |
| 94 | obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE); |
| 95 | if (!obj_desc) { |
| 96 | return_ACPI_STATUS(AE_NO_MEMORY); |
| 97 | } |
| 98 | |
| 99 | /* Init the table handle */ |
| 100 | |
| 101 | obj_desc->common.flags |= AOPOBJ_DATA_VALID; |
| 102 | obj_desc->reference.class = ACPI_REFCLASS_TABLE; |
| 103 | *ddb_handle = obj_desc; |
| 104 | |
| 105 | /* Install the new table into the local data structures */ |
| 106 | |
| 107 | obj_desc->reference.value = table_index; |
| 108 | |
| 109 | /* Add the table to the namespace */ |
| 110 | |
| 111 | status = acpi_ns_load_table(table_index, parent_node); |
| 112 | if (ACPI_FAILURE(status)) { |
| 113 | acpi_ut_remove_reference(obj_desc); |
| 114 | *ddb_handle = NULL; |
| 115 | return_ACPI_STATUS(status); |
| 116 | } |
| 117 | |
| 118 | /* Execute any module-level code that was found in the table */ |
| 119 | |
| 120 | acpi_ex_exit_interpreter(); |
| 121 | acpi_ns_exec_module_code_list(); |
| 122 | acpi_ex_enter_interpreter(); |
| 123 | |
| 124 | /* |
| 125 | * Update GPEs for any new _Lxx/_Exx methods. Ignore errors. The host is |
| 126 | * responsible for discovering any new wake GPEs by running _PRW methods |
| 127 | * that may have been loaded by this table. |
| 128 | */ |
| 129 | status = acpi_tb_get_owner_id(table_index, &owner_id); |
| 130 | if (ACPI_SUCCESS(status)) { |
| 131 | acpi_ev_update_gpes(owner_id); |
| 132 | } |
| 133 | |
| 134 | return_ACPI_STATUS(AE_OK); |
| 135 | } |
| 136 | |
| 137 | /******************************************************************************* |
| 138 | * |
| 139 | * FUNCTION: acpi_ex_load_table_op |
| 140 | * |
| 141 | * PARAMETERS: walk_state - Current state with operands |
| 142 | * return_desc - Where to store the return object |
| 143 | * |
| 144 | * RETURN: Status |
| 145 | * |
| 146 | * DESCRIPTION: Load an ACPI table from the RSDT/XSDT |
| 147 | * |
| 148 | ******************************************************************************/ |
| 149 | |
| 150 | acpi_status |
| 151 | acpi_ex_load_table_op(struct acpi_walk_state *walk_state, |
| 152 | union acpi_operand_object **return_desc) |
| 153 | { |
| 154 | acpi_status status; |
| 155 | union acpi_operand_object **operand = &walk_state->operands[0]; |
| 156 | struct acpi_namespace_node *parent_node; |
| 157 | struct acpi_namespace_node *start_node; |
| 158 | struct acpi_namespace_node *parameter_node = NULL; |
| 159 | union acpi_operand_object *ddb_handle; |
| 160 | struct acpi_table_header *table; |
| 161 | u32 table_index; |
| 162 | |
| 163 | ACPI_FUNCTION_TRACE(ex_load_table_op); |
| 164 | |
| 165 | /* Find the ACPI table in the RSDT/XSDT */ |
| 166 | |
| 167 | status = acpi_tb_find_table(operand[0]->string.pointer, |
| 168 | operand[1]->string.pointer, |
| 169 | operand[2]->string.pointer, &table_index); |
| 170 | if (ACPI_FAILURE(status)) { |
| 171 | if (status != AE_NOT_FOUND) { |
| 172 | return_ACPI_STATUS(status); |
| 173 | } |
| 174 | |
| 175 | /* Table not found, return an Integer=0 and AE_OK */ |
| 176 | |
| 177 | ddb_handle = acpi_ut_create_integer_object((u64) 0); |
| 178 | if (!ddb_handle) { |
| 179 | return_ACPI_STATUS(AE_NO_MEMORY); |
| 180 | } |
| 181 | |
| 182 | *return_desc = ddb_handle; |
| 183 | return_ACPI_STATUS(AE_OK); |
| 184 | } |
| 185 | |
| 186 | /* Default nodes */ |
| 187 | |
| 188 | start_node = walk_state->scope_info->scope.node; |
| 189 | parent_node = acpi_gbl_root_node; |
| 190 | |
| 191 | /* root_path (optional parameter) */ |
| 192 | |
| 193 | if (operand[3]->string.length > 0) { |
| 194 | /* |
| 195 | * Find the node referenced by the root_path_string. This is the |
| 196 | * location within the namespace where the table will be loaded. |
| 197 | */ |
| 198 | status = |
| 199 | acpi_ns_get_node(start_node, operand[3]->string.pointer, |
| 200 | ACPI_NS_SEARCH_PARENT, &parent_node); |
| 201 | if (ACPI_FAILURE(status)) { |
| 202 | return_ACPI_STATUS(status); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | /* parameter_path (optional parameter) */ |
| 207 | |
| 208 | if (operand[4]->string.length > 0) { |
| 209 | if ((operand[4]->string.pointer[0] != AML_ROOT_PREFIX) && |
| 210 | (operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) { |
| 211 | /* |
| 212 | * Path is not absolute, so it will be relative to the node |
| 213 | * referenced by the root_path_string (or the NS root if omitted) |
| 214 | */ |
| 215 | start_node = parent_node; |
| 216 | } |
| 217 | |
| 218 | /* Find the node referenced by the parameter_path_string */ |
| 219 | |
| 220 | status = |
| 221 | acpi_ns_get_node(start_node, operand[4]->string.pointer, |
| 222 | ACPI_NS_SEARCH_PARENT, ¶meter_node); |
| 223 | if (ACPI_FAILURE(status)) { |
| 224 | return_ACPI_STATUS(status); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | /* Load the table into the namespace */ |
| 229 | |
| 230 | status = acpi_ex_add_table(table_index, parent_node, &ddb_handle); |
| 231 | if (ACPI_FAILURE(status)) { |
| 232 | return_ACPI_STATUS(status); |
| 233 | } |
| 234 | |
| 235 | /* Parameter Data (optional) */ |
| 236 | |
| 237 | if (parameter_node) { |
| 238 | |
| 239 | /* Store the parameter data into the optional parameter object */ |
| 240 | |
| 241 | status = acpi_ex_store(operand[5], |
| 242 | ACPI_CAST_PTR(union acpi_operand_object, |
| 243 | parameter_node), |
| 244 | walk_state); |
| 245 | if (ACPI_FAILURE(status)) { |
| 246 | (void)acpi_ex_unload_table(ddb_handle); |
| 247 | |
| 248 | acpi_ut_remove_reference(ddb_handle); |
| 249 | return_ACPI_STATUS(status); |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | status = acpi_get_table_by_index(table_index, &table); |
| 254 | if (ACPI_SUCCESS(status)) { |
| 255 | ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:")); |
| 256 | acpi_tb_print_table_header(0, table); |
| 257 | } |
| 258 | |
| 259 | /* Invoke table handler if present */ |
| 260 | |
| 261 | if (acpi_gbl_table_handler) { |
| 262 | (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table, |
| 263 | acpi_gbl_table_handler_context); |
| 264 | } |
| 265 | |
| 266 | *return_desc = ddb_handle; |
| 267 | return_ACPI_STATUS(status); |
| 268 | } |
| 269 | |
| 270 | /******************************************************************************* |
| 271 | * |
| 272 | * FUNCTION: acpi_ex_region_read |
| 273 | * |
| 274 | * PARAMETERS: obj_desc - Region descriptor |
| 275 | * length - Number of bytes to read |
| 276 | * buffer - Pointer to where to put the data |
| 277 | * |
| 278 | * RETURN: Status |
| 279 | * |
| 280 | * DESCRIPTION: Read data from an operation region. The read starts from the |
| 281 | * beginning of the region. |
| 282 | * |
| 283 | ******************************************************************************/ |
| 284 | |
| 285 | static acpi_status |
| 286 | acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer) |
| 287 | { |
| 288 | acpi_status status; |
| 289 | u64 value; |
| 290 | u32 region_offset = 0; |
| 291 | u32 i; |
| 292 | |
| 293 | /* Bytewise reads */ |
| 294 | |
| 295 | for (i = 0; i < length; i++) { |
| 296 | status = |
| 297 | acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ, |
| 298 | region_offset, 8, &value); |
| 299 | if (ACPI_FAILURE(status)) { |
| 300 | return (status); |
| 301 | } |
| 302 | |
| 303 | *buffer = (u8)value; |
| 304 | buffer++; |
| 305 | region_offset++; |
| 306 | } |
| 307 | |
| 308 | return (AE_OK); |
| 309 | } |
| 310 | |
| 311 | /******************************************************************************* |
| 312 | * |
| 313 | * FUNCTION: acpi_ex_load_op |
| 314 | * |
| 315 | * PARAMETERS: obj_desc - Region or Buffer/Field where the table will be |
| 316 | * obtained |
| 317 | * target - Where a handle to the table will be stored |
| 318 | * walk_state - Current state |
| 319 | * |
| 320 | * RETURN: Status |
| 321 | * |
| 322 | * DESCRIPTION: Load an ACPI table from a field or operation region |
| 323 | * |
| 324 | * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer |
| 325 | * objects before this code is reached. |
| 326 | * |
| 327 | * If source is an operation region, it must refer to system_memory, as |
| 328 | * per the ACPI specification. |
| 329 | * |
| 330 | ******************************************************************************/ |
| 331 | |
| 332 | acpi_status |
| 333 | acpi_ex_load_op(union acpi_operand_object *obj_desc, |
| 334 | union acpi_operand_object *target, |
| 335 | struct acpi_walk_state *walk_state) |
| 336 | { |
| 337 | union acpi_operand_object *ddb_handle; |
| 338 | struct acpi_table_header *table_header; |
| 339 | struct acpi_table_header *table; |
| 340 | u32 table_index; |
| 341 | acpi_status status; |
| 342 | u32 length; |
| 343 | |
| 344 | ACPI_FUNCTION_TRACE(ex_load_op); |
| 345 | |
| 346 | /* Source Object can be either an op_region or a Buffer/Field */ |
| 347 | |
| 348 | switch (obj_desc->common.type) { |
| 349 | case ACPI_TYPE_REGION: |
| 350 | |
| 351 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
| 352 | "Load table from Region %p\n", obj_desc)); |
| 353 | |
| 354 | /* Region must be system_memory (from ACPI spec) */ |
| 355 | |
| 356 | if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) { |
| 357 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
| 358 | } |
| 359 | |
| 360 | /* |
| 361 | * If the Region Address and Length have not been previously |
| 362 | * evaluated, evaluate them now and save the results. |
| 363 | */ |
| 364 | if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { |
| 365 | status = acpi_ds_get_region_arguments(obj_desc); |
| 366 | if (ACPI_FAILURE(status)) { |
| 367 | return_ACPI_STATUS(status); |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | /* Get the table header first so we can get the table length */ |
| 372 | |
| 373 | table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header)); |
| 374 | if (!table_header) { |
| 375 | return_ACPI_STATUS(AE_NO_MEMORY); |
| 376 | } |
| 377 | |
| 378 | status = |
| 379 | acpi_ex_region_read(obj_desc, |
| 380 | sizeof(struct acpi_table_header), |
| 381 | ACPI_CAST_PTR(u8, table_header)); |
| 382 | length = table_header->length; |
| 383 | ACPI_FREE(table_header); |
| 384 | |
| 385 | if (ACPI_FAILURE(status)) { |
| 386 | return_ACPI_STATUS(status); |
| 387 | } |
| 388 | |
| 389 | /* Must have at least an ACPI table header */ |
| 390 | |
| 391 | if (length < sizeof(struct acpi_table_header)) { |
| 392 | return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * The original implementation simply mapped the table, with no copy. |
| 397 | * However, the memory region is not guaranteed to remain stable and |
| 398 | * we must copy the table to a local buffer. For example, the memory |
| 399 | * region is corrupted after suspend on some machines. Dynamically |
| 400 | * loaded tables are usually small, so this overhead is minimal. |
| 401 | * |
| 402 | * The latest implementation (5/2009) does not use a mapping at all. |
| 403 | * We use the low-level operation region interface to read the table |
| 404 | * instead of the obvious optimization of using a direct mapping. |
| 405 | * This maintains a consistent use of operation regions across the |
| 406 | * entire subsystem. This is important if additional processing must |
| 407 | * be performed in the (possibly user-installed) operation region |
| 408 | * handler. For example, acpi_exec and ASLTS depend on this. |
| 409 | */ |
| 410 | |
| 411 | /* Allocate a buffer for the table */ |
| 412 | |
| 413 | table = ACPI_ALLOCATE(length); |
| 414 | if (!table) { |
| 415 | return_ACPI_STATUS(AE_NO_MEMORY); |
| 416 | } |
| 417 | |
| 418 | /* Read the entire table */ |
| 419 | |
| 420 | status = acpi_ex_region_read(obj_desc, length, |
| 421 | ACPI_CAST_PTR(u8, table)); |
| 422 | if (ACPI_FAILURE(status)) { |
| 423 | ACPI_FREE(table); |
| 424 | return_ACPI_STATUS(status); |
| 425 | } |
| 426 | break; |
| 427 | |
| 428 | case ACPI_TYPE_BUFFER: /* Buffer or resolved region_field */ |
| 429 | |
| 430 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
| 431 | "Load table from Buffer or Field %p\n", |
| 432 | obj_desc)); |
| 433 | |
| 434 | /* Must have at least an ACPI table header */ |
| 435 | |
| 436 | if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) { |
| 437 | return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); |
| 438 | } |
| 439 | |
| 440 | /* Get the actual table length from the table header */ |
| 441 | |
| 442 | table_header = |
| 443 | ACPI_CAST_PTR(struct acpi_table_header, |
| 444 | obj_desc->buffer.pointer); |
| 445 | length = table_header->length; |
| 446 | |
| 447 | /* Table cannot extend beyond the buffer */ |
| 448 | |
| 449 | if (length > obj_desc->buffer.length) { |
| 450 | return_ACPI_STATUS(AE_AML_BUFFER_LIMIT); |
| 451 | } |
| 452 | if (length < sizeof(struct acpi_table_header)) { |
| 453 | return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); |
| 454 | } |
| 455 | |
| 456 | /* |
| 457 | * Copy the table from the buffer because the buffer could be |
| 458 | * modified or even deleted in the future |
| 459 | */ |
| 460 | table = ACPI_ALLOCATE(length); |
| 461 | if (!table) { |
| 462 | return_ACPI_STATUS(AE_NO_MEMORY); |
| 463 | } |
| 464 | |
| 465 | memcpy(table, table_header, length); |
| 466 | break; |
| 467 | |
| 468 | default: |
| 469 | |
| 470 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
| 471 | } |
| 472 | |
| 473 | /* Install the new table into the local data structures */ |
| 474 | |
| 475 | ACPI_INFO((AE_INFO, "Dynamic OEM Table Load:")); |
| 476 | (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); |
| 477 | |
| 478 | status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table), |
| 479 | ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, |
| 480 | TRUE, TRUE, &table_index); |
| 481 | |
| 482 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); |
| 483 | if (ACPI_FAILURE(status)) { |
| 484 | |
| 485 | /* Delete allocated table buffer */ |
| 486 | |
| 487 | ACPI_FREE(table); |
| 488 | return_ACPI_STATUS(status); |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * Note: Now table is "INSTALLED", it must be validated before |
| 493 | * loading. |
| 494 | */ |
| 495 | status = |
| 496 | acpi_tb_validate_table(&acpi_gbl_root_table_list. |
| 497 | tables[table_index]); |
| 498 | if (ACPI_FAILURE(status)) { |
| 499 | return_ACPI_STATUS(status); |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * Add the table to the namespace. |
| 504 | * |
| 505 | * Note: Load the table objects relative to the root of the namespace. |
| 506 | * This appears to go against the ACPI specification, but we do it for |
| 507 | * compatibility with other ACPI implementations. |
| 508 | */ |
| 509 | status = |
| 510 | acpi_ex_add_table(table_index, acpi_gbl_root_node, &ddb_handle); |
| 511 | if (ACPI_FAILURE(status)) { |
| 512 | |
| 513 | /* On error, table_ptr was deallocated above */ |
| 514 | |
| 515 | return_ACPI_STATUS(status); |
| 516 | } |
| 517 | |
| 518 | /* Store the ddb_handle into the Target operand */ |
| 519 | |
| 520 | status = acpi_ex_store(ddb_handle, target, walk_state); |
| 521 | if (ACPI_FAILURE(status)) { |
| 522 | (void)acpi_ex_unload_table(ddb_handle); |
| 523 | |
| 524 | /* table_ptr was deallocated above */ |
| 525 | |
| 526 | acpi_ut_remove_reference(ddb_handle); |
| 527 | return_ACPI_STATUS(status); |
| 528 | } |
| 529 | |
| 530 | /* Remove the reference by added by acpi_ex_store above */ |
| 531 | |
| 532 | acpi_ut_remove_reference(ddb_handle); |
| 533 | |
| 534 | /* Invoke table handler if present */ |
| 535 | |
| 536 | if (acpi_gbl_table_handler) { |
| 537 | (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table, |
| 538 | acpi_gbl_table_handler_context); |
| 539 | } |
| 540 | |
| 541 | return_ACPI_STATUS(status); |
| 542 | } |
| 543 | |
| 544 | /******************************************************************************* |
| 545 | * |
| 546 | * FUNCTION: acpi_ex_unload_table |
| 547 | * |
| 548 | * PARAMETERS: ddb_handle - Handle to a previously loaded table |
| 549 | * |
| 550 | * RETURN: Status |
| 551 | * |
| 552 | * DESCRIPTION: Unload an ACPI table |
| 553 | * |
| 554 | ******************************************************************************/ |
| 555 | |
| 556 | acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle) |
| 557 | { |
| 558 | acpi_status status = AE_OK; |
| 559 | union acpi_operand_object *table_desc = ddb_handle; |
| 560 | u32 table_index; |
| 561 | struct acpi_table_header *table; |
| 562 | |
| 563 | ACPI_FUNCTION_TRACE(ex_unload_table); |
| 564 | |
| 565 | /* |
| 566 | * Temporarily emit a warning so that the ASL for the machine can be |
| 567 | * hopefully obtained. This is to say that the Unload() operator is |
| 568 | * extremely rare if not completely unused. |
| 569 | */ |
| 570 | ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table")); |
| 571 | |
| 572 | /* |
| 573 | * Validate the handle |
| 574 | * Although the handle is partially validated in acpi_ex_reconfiguration() |
| 575 | * when it calls acpi_ex_resolve_operands(), the handle is more completely |
| 576 | * validated here. |
| 577 | * |
| 578 | * Handle must be a valid operand object of type reference. Also, the |
| 579 | * ddb_handle must still be marked valid (table has not been previously |
| 580 | * unloaded) |
| 581 | */ |
| 582 | if ((!ddb_handle) || |
| 583 | (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) || |
| 584 | (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) || |
| 585 | (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) { |
| 586 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
| 587 | } |
| 588 | |
| 589 | /* Get the table index from the ddb_handle */ |
| 590 | |
| 591 | table_index = table_desc->reference.value; |
| 592 | |
| 593 | /* Ensure the table is still loaded */ |
| 594 | |
| 595 | if (!acpi_tb_is_table_loaded(table_index)) { |
| 596 | return_ACPI_STATUS(AE_NOT_EXIST); |
| 597 | } |
| 598 | |
| 599 | /* Invoke table handler if present */ |
| 600 | |
| 601 | if (acpi_gbl_table_handler) { |
| 602 | status = acpi_get_table_by_index(table_index, &table); |
| 603 | if (ACPI_SUCCESS(status)) { |
| 604 | (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD, |
| 605 | table, |
| 606 | acpi_gbl_table_handler_context); |
| 607 | } |
| 608 | } |
| 609 | |
| 610 | /* Delete the portion of the namespace owned by this table */ |
| 611 | |
| 612 | status = acpi_tb_delete_namespace_by_owner(table_index); |
| 613 | if (ACPI_FAILURE(status)) { |
| 614 | return_ACPI_STATUS(status); |
| 615 | } |
| 616 | |
| 617 | (void)acpi_tb_release_owner_id(table_index); |
| 618 | acpi_tb_set_table_loaded_flag(table_index, FALSE); |
| 619 | |
| 620 | /* |
| 621 | * Invalidate the handle. We do this because the handle may be stored |
| 622 | * in a named object and may not be actually deleted until much later. |
| 623 | */ |
| 624 | ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID; |
| 625 | return_ACPI_STATUS(AE_OK); |
| 626 | } |