| 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes) |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
| 8 | * Copyright (C) 2000 - 2016, 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.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 | |
| 54 | #define _COMPONENT ACPI_EXECUTER |
| 55 | ACPI_MODULE_NAME ("exconfig" ) |
| 56 | |
| 57 | /* Local prototypes */ |
| 58 | |
| 59 | static ACPI_STATUS |
| 60 | AcpiExAddTable ( |
| 61 | UINT32 TableIndex, |
| 62 | ACPI_OPERAND_OBJECT **DdbHandle); |
| 63 | |
| 64 | static ACPI_STATUS |
| 65 | AcpiExRegionRead ( |
| 66 | ACPI_OPERAND_OBJECT *ObjDesc, |
| 67 | UINT32 Length, |
| 68 | UINT8 *Buffer); |
| 69 | |
| 70 | |
| 71 | /******************************************************************************* |
| 72 | * |
| 73 | * FUNCTION: AcpiExAddTable |
| 74 | * |
| 75 | * PARAMETERS: Table - Pointer to raw table |
| 76 | * ParentNode - Where to load the table (scope) |
| 77 | * DdbHandle - Where to return the table handle. |
| 78 | * |
| 79 | * RETURN: Status |
| 80 | * |
| 81 | * DESCRIPTION: Common function to Install and Load an ACPI table with a |
| 82 | * returned table handle. |
| 83 | * |
| 84 | ******************************************************************************/ |
| 85 | |
| 86 | static ACPI_STATUS |
| 87 | AcpiExAddTable ( |
| 88 | UINT32 TableIndex, |
| 89 | ACPI_OPERAND_OBJECT **DdbHandle) |
| 90 | { |
| 91 | ACPI_OPERAND_OBJECT *ObjDesc; |
| 92 | |
| 93 | |
| 94 | ACPI_FUNCTION_TRACE (ExAddTable); |
| 95 | |
| 96 | |
| 97 | /* Create an object to be the table handle */ |
| 98 | |
| 99 | ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE); |
| 100 | if (!ObjDesc) |
| 101 | { |
| 102 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 103 | } |
| 104 | |
| 105 | /* Init the table handle */ |
| 106 | |
| 107 | ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID; |
| 108 | ObjDesc->Reference.Class = ACPI_REFCLASS_TABLE; |
| 109 | ObjDesc->Reference.Value = TableIndex; |
| 110 | *DdbHandle = ObjDesc; |
| 111 | return_ACPI_STATUS (AE_OK); |
| 112 | } |
| 113 | |
| 114 | |
| 115 | /******************************************************************************* |
| 116 | * |
| 117 | * FUNCTION: AcpiExLoadTableOp |
| 118 | * |
| 119 | * PARAMETERS: WalkState - Current state with operands |
| 120 | * ReturnDesc - Where to store the return object |
| 121 | * |
| 122 | * RETURN: Status |
| 123 | * |
| 124 | * DESCRIPTION: Load an ACPI table from the RSDT/XSDT |
| 125 | * |
| 126 | ******************************************************************************/ |
| 127 | |
| 128 | ACPI_STATUS |
| 129 | AcpiExLoadTableOp ( |
| 130 | ACPI_WALK_STATE *WalkState, |
| 131 | ACPI_OPERAND_OBJECT **ReturnDesc) |
| 132 | { |
| 133 | ACPI_STATUS Status; |
| 134 | ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0]; |
| 135 | ACPI_NAMESPACE_NODE *ParentNode; |
| 136 | ACPI_NAMESPACE_NODE *StartNode; |
| 137 | ACPI_NAMESPACE_NODE *ParameterNode = NULL; |
| 138 | ACPI_OPERAND_OBJECT *DdbHandle; |
| 139 | UINT32 TableIndex; |
| 140 | |
| 141 | |
| 142 | ACPI_FUNCTION_TRACE (ExLoadTableOp); |
| 143 | |
| 144 | |
| 145 | /* Find the ACPI table in the RSDT/XSDT */ |
| 146 | |
| 147 | AcpiExExitInterpreter (); |
| 148 | Status = AcpiTbFindTable ( |
| 149 | Operand[0]->String.Pointer, |
| 150 | Operand[1]->String.Pointer, |
| 151 | Operand[2]->String.Pointer, &TableIndex); |
| 152 | AcpiExEnterInterpreter (); |
| 153 | if (ACPI_FAILURE (Status)) |
| 154 | { |
| 155 | if (Status != AE_NOT_FOUND) |
| 156 | { |
| 157 | return_ACPI_STATUS (Status); |
| 158 | } |
| 159 | |
| 160 | /* Table not found, return an Integer=0 and AE_OK */ |
| 161 | |
| 162 | DdbHandle = AcpiUtCreateIntegerObject ((UINT64) 0); |
| 163 | if (!DdbHandle) |
| 164 | { |
| 165 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 166 | } |
| 167 | |
| 168 | *ReturnDesc = DdbHandle; |
| 169 | return_ACPI_STATUS (AE_OK); |
| 170 | } |
| 171 | |
| 172 | /* Default nodes */ |
| 173 | |
| 174 | StartNode = WalkState->ScopeInfo->Scope.Node; |
| 175 | ParentNode = AcpiGbl_RootNode; |
| 176 | |
| 177 | /* RootPath (optional parameter) */ |
| 178 | |
| 179 | if (Operand[3]->String.Length > 0) |
| 180 | { |
| 181 | /* |
| 182 | * Find the node referenced by the RootPathString. This is the |
| 183 | * location within the namespace where the table will be loaded. |
| 184 | */ |
| 185 | Status = AcpiNsGetNodeUnlocked (StartNode, |
| 186 | Operand[3]->String.Pointer, ACPI_NS_SEARCH_PARENT, |
| 187 | &ParentNode); |
| 188 | if (ACPI_FAILURE (Status)) |
| 189 | { |
| 190 | return_ACPI_STATUS (Status); |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | /* ParameterPath (optional parameter) */ |
| 195 | |
| 196 | if (Operand[4]->String.Length > 0) |
| 197 | { |
| 198 | if ((Operand[4]->String.Pointer[0] != AML_ROOT_PREFIX) && |
| 199 | (Operand[4]->String.Pointer[0] != AML_PARENT_PREFIX)) |
| 200 | { |
| 201 | /* |
| 202 | * Path is not absolute, so it will be relative to the node |
| 203 | * referenced by the RootPathString (or the NS root if omitted) |
| 204 | */ |
| 205 | StartNode = ParentNode; |
| 206 | } |
| 207 | |
| 208 | /* Find the node referenced by the ParameterPathString */ |
| 209 | |
| 210 | Status = AcpiNsGetNodeUnlocked (StartNode, |
| 211 | Operand[4]->String.Pointer, ACPI_NS_SEARCH_PARENT, |
| 212 | &ParameterNode); |
| 213 | if (ACPI_FAILURE (Status)) |
| 214 | { |
| 215 | return_ACPI_STATUS (Status); |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | /* Load the table into the namespace */ |
| 220 | |
| 221 | ACPI_INFO (("Dynamic OEM Table Load:" )); |
| 222 | AcpiExExitInterpreter (); |
| 223 | Status = AcpiTbLoadTable (TableIndex, ParentNode); |
| 224 | AcpiExEnterInterpreter (); |
| 225 | if (ACPI_FAILURE (Status)) |
| 226 | { |
| 227 | return_ACPI_STATUS (Status); |
| 228 | } |
| 229 | |
| 230 | Status = AcpiExAddTable (TableIndex, &DdbHandle); |
| 231 | if (ACPI_FAILURE (Status)) |
| 232 | { |
| 233 | return_ACPI_STATUS (Status); |
| 234 | } |
| 235 | |
| 236 | /* Parameter Data (optional) */ |
| 237 | |
| 238 | if (ParameterNode) |
| 239 | { |
| 240 | /* Store the parameter data into the optional parameter object */ |
| 241 | |
| 242 | Status = AcpiExStore (Operand[5], |
| 243 | ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParameterNode), WalkState); |
| 244 | if (ACPI_FAILURE (Status)) |
| 245 | { |
| 246 | (void) AcpiExUnloadTable (DdbHandle); |
| 247 | |
| 248 | AcpiUtRemoveReference (DdbHandle); |
| 249 | return_ACPI_STATUS (Status); |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | *ReturnDesc = DdbHandle; |
| 254 | return_ACPI_STATUS (Status); |
| 255 | } |
| 256 | |
| 257 | |
| 258 | /******************************************************************************* |
| 259 | * |
| 260 | * FUNCTION: AcpiExRegionRead |
| 261 | * |
| 262 | * PARAMETERS: ObjDesc - Region descriptor |
| 263 | * Length - Number of bytes to read |
| 264 | * Buffer - Pointer to where to put the data |
| 265 | * |
| 266 | * RETURN: Status |
| 267 | * |
| 268 | * DESCRIPTION: Read data from an operation region. The read starts from the |
| 269 | * beginning of the region. |
| 270 | * |
| 271 | ******************************************************************************/ |
| 272 | |
| 273 | static ACPI_STATUS |
| 274 | AcpiExRegionRead ( |
| 275 | ACPI_OPERAND_OBJECT *ObjDesc, |
| 276 | UINT32 Length, |
| 277 | UINT8 *Buffer) |
| 278 | { |
| 279 | ACPI_STATUS Status; |
| 280 | UINT64 Value; |
| 281 | UINT32 RegionOffset = 0; |
| 282 | UINT32 i; |
| 283 | |
| 284 | |
| 285 | /* Bytewise reads */ |
| 286 | |
| 287 | for (i = 0; i < Length; i++) |
| 288 | { |
| 289 | Status = AcpiEvAddressSpaceDispatch (ObjDesc, NULL, ACPI_READ, |
| 290 | RegionOffset, 8, &Value); |
| 291 | if (ACPI_FAILURE (Status)) |
| 292 | { |
| 293 | return (Status); |
| 294 | } |
| 295 | |
| 296 | *Buffer = (UINT8) Value; |
| 297 | Buffer++; |
| 298 | RegionOffset++; |
| 299 | } |
| 300 | |
| 301 | return (AE_OK); |
| 302 | } |
| 303 | |
| 304 | |
| 305 | /******************************************************************************* |
| 306 | * |
| 307 | * FUNCTION: AcpiExLoadOp |
| 308 | * |
| 309 | * PARAMETERS: ObjDesc - Region or Buffer/Field where the table will be |
| 310 | * obtained |
| 311 | * Target - Where a handle to the table will be stored |
| 312 | * WalkState - Current state |
| 313 | * |
| 314 | * RETURN: Status |
| 315 | * |
| 316 | * DESCRIPTION: Load an ACPI table from a field or operation region |
| 317 | * |
| 318 | * NOTE: Region Fields (Field, BankField, IndexFields) are resolved to buffer |
| 319 | * objects before this code is reached. |
| 320 | * |
| 321 | * If source is an operation region, it must refer to SystemMemory, as |
| 322 | * per the ACPI specification. |
| 323 | * |
| 324 | ******************************************************************************/ |
| 325 | |
| 326 | ACPI_STATUS |
| 327 | AcpiExLoadOp ( |
| 328 | ACPI_OPERAND_OBJECT *ObjDesc, |
| 329 | ACPI_OPERAND_OBJECT *Target, |
| 330 | ACPI_WALK_STATE *WalkState) |
| 331 | { |
| 332 | ACPI_OPERAND_OBJECT *DdbHandle; |
| 333 | ACPI_TABLE_HEADER *; |
| 334 | ACPI_TABLE_HEADER *Table; |
| 335 | UINT32 TableIndex; |
| 336 | ACPI_STATUS Status; |
| 337 | UINT32 Length; |
| 338 | |
| 339 | |
| 340 | ACPI_FUNCTION_TRACE (ExLoadOp); |
| 341 | |
| 342 | |
| 343 | /* Source Object can be either an OpRegion or a Buffer/Field */ |
| 344 | |
| 345 | switch (ObjDesc->Common.Type) |
| 346 | { |
| 347 | case ACPI_TYPE_REGION: |
| 348 | |
| 349 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| 350 | "Load table from Region %p\n" , ObjDesc)); |
| 351 | |
| 352 | /* Region must be SystemMemory (from ACPI spec) */ |
| 353 | |
| 354 | if (ObjDesc->Region.SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY) |
| 355 | { |
| 356 | return_ACPI_STATUS (AE_AML_OPERAND_TYPE); |
| 357 | } |
| 358 | |
| 359 | /* |
| 360 | * If the Region Address and Length have not been previously |
| 361 | * evaluated, evaluate them now and save the results. |
| 362 | */ |
| 363 | if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)) |
| 364 | { |
| 365 | Status = AcpiDsGetRegionArguments (ObjDesc); |
| 366 | if (ACPI_FAILURE (Status)) |
| 367 | { |
| 368 | return_ACPI_STATUS (Status); |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | /* Get the table header first so we can get the table length */ |
| 373 | |
| 374 | TableHeader = ACPI_ALLOCATE (sizeof (ACPI_TABLE_HEADER)); |
| 375 | if (!TableHeader) |
| 376 | { |
| 377 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 378 | } |
| 379 | |
| 380 | Status = AcpiExRegionRead (ObjDesc, sizeof (ACPI_TABLE_HEADER), |
| 381 | ACPI_CAST_PTR (UINT8, TableHeader)); |
| 382 | Length = TableHeader->Length; |
| 383 | ACPI_FREE (TableHeader); |
| 384 | |
| 385 | if (ACPI_FAILURE (Status)) |
| 386 | { |
| 387 | return_ACPI_STATUS (Status); |
| 388 | } |
| 389 | |
| 390 | /* Must have at least an ACPI table header */ |
| 391 | |
| 392 | if (Length < sizeof (ACPI_TABLE_HEADER)) |
| 393 | { |
| 394 | return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); |
| 395 | } |
| 396 | |
| 397 | /* |
| 398 | * The original implementation simply mapped the table, with no copy. |
| 399 | * However, the memory region is not guaranteed to remain stable and |
| 400 | * we must copy the table to a local buffer. For example, the memory |
| 401 | * region is corrupted after suspend on some machines. Dynamically |
| 402 | * loaded tables are usually small, so this overhead is minimal. |
| 403 | * |
| 404 | * The latest implementation (5/2009) does not use a mapping at all. |
| 405 | * We use the low-level operation region interface to read the table |
| 406 | * instead of the obvious optimization of using a direct mapping. |
| 407 | * This maintains a consistent use of operation regions across the |
| 408 | * entire subsystem. This is important if additional processing must |
| 409 | * be performed in the (possibly user-installed) operation region |
| 410 | * handler. For example, AcpiExec and ASLTS depend on this. |
| 411 | */ |
| 412 | |
| 413 | /* Allocate a buffer for the table */ |
| 414 | |
| 415 | Table = ACPI_ALLOCATE (Length); |
| 416 | if (!Table) |
| 417 | { |
| 418 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 419 | } |
| 420 | |
| 421 | /* Read the entire table */ |
| 422 | |
| 423 | Status = AcpiExRegionRead (ObjDesc, Length, |
| 424 | ACPI_CAST_PTR (UINT8, Table)); |
| 425 | if (ACPI_FAILURE (Status)) |
| 426 | { |
| 427 | ACPI_FREE (Table); |
| 428 | return_ACPI_STATUS (Status); |
| 429 | } |
| 430 | break; |
| 431 | |
| 432 | case ACPI_TYPE_BUFFER: /* Buffer or resolved RegionField */ |
| 433 | |
| 434 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
| 435 | "Load table from Buffer or Field %p\n" , ObjDesc)); |
| 436 | |
| 437 | /* Must have at least an ACPI table header */ |
| 438 | |
| 439 | if (ObjDesc->Buffer.Length < sizeof (ACPI_TABLE_HEADER)) |
| 440 | { |
| 441 | return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); |
| 442 | } |
| 443 | |
| 444 | /* Get the actual table length from the table header */ |
| 445 | |
| 446 | TableHeader = ACPI_CAST_PTR ( |
| 447 | ACPI_TABLE_HEADER, ObjDesc->Buffer.Pointer); |
| 448 | Length = TableHeader->Length; |
| 449 | |
| 450 | /* Table cannot extend beyond the buffer */ |
| 451 | |
| 452 | if (Length > ObjDesc->Buffer.Length) |
| 453 | { |
| 454 | return_ACPI_STATUS (AE_AML_BUFFER_LIMIT); |
| 455 | } |
| 456 | if (Length < sizeof (ACPI_TABLE_HEADER)) |
| 457 | { |
| 458 | return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); |
| 459 | } |
| 460 | |
| 461 | /* |
| 462 | * Copy the table from the buffer because the buffer could be |
| 463 | * modified or even deleted in the future |
| 464 | */ |
| 465 | Table = ACPI_ALLOCATE (Length); |
| 466 | if (!Table) |
| 467 | { |
| 468 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 469 | } |
| 470 | |
| 471 | memcpy (Table, TableHeader, Length); |
| 472 | break; |
| 473 | |
| 474 | default: |
| 475 | |
| 476 | return_ACPI_STATUS (AE_AML_OPERAND_TYPE); |
| 477 | } |
| 478 | |
| 479 | /* Install the new table into the local data structures */ |
| 480 | |
| 481 | ACPI_INFO (("Dynamic OEM Table Load:" )); |
| 482 | AcpiExExitInterpreter (); |
| 483 | Status = AcpiTbInstallAndLoadTable (Table, ACPI_PTR_TO_PHYSADDR (Table), |
| 484 | ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, TRUE, &TableIndex); |
| 485 | AcpiExEnterInterpreter (); |
| 486 | if (ACPI_FAILURE (Status)) |
| 487 | { |
| 488 | /* Delete allocated table buffer */ |
| 489 | |
| 490 | ACPI_FREE (Table); |
| 491 | return_ACPI_STATUS (Status); |
| 492 | } |
| 493 | |
| 494 | /* |
| 495 | * Add the table to the namespace. |
| 496 | * |
| 497 | * Note: Load the table objects relative to the root of the namespace. |
| 498 | * This appears to go against the ACPI specification, but we do it for |
| 499 | * compatibility with other ACPI implementations. |
| 500 | */ |
| 501 | Status = AcpiExAddTable (TableIndex, &DdbHandle); |
| 502 | if (ACPI_FAILURE (Status)) |
| 503 | { |
| 504 | /* On error, TablePtr was deallocated above */ |
| 505 | |
| 506 | return_ACPI_STATUS (Status); |
| 507 | } |
| 508 | |
| 509 | /* Store the DdbHandle into the Target operand */ |
| 510 | |
| 511 | Status = AcpiExStore (DdbHandle, Target, WalkState); |
| 512 | if (ACPI_FAILURE (Status)) |
| 513 | { |
| 514 | (void) AcpiExUnloadTable (DdbHandle); |
| 515 | |
| 516 | /* TablePtr was deallocated above */ |
| 517 | |
| 518 | AcpiUtRemoveReference (DdbHandle); |
| 519 | return_ACPI_STATUS (Status); |
| 520 | } |
| 521 | |
| 522 | /* Remove the reference by added by AcpiExStore above */ |
| 523 | |
| 524 | AcpiUtRemoveReference (DdbHandle); |
| 525 | return_ACPI_STATUS (Status); |
| 526 | } |
| 527 | |
| 528 | |
| 529 | /******************************************************************************* |
| 530 | * |
| 531 | * FUNCTION: AcpiExUnloadTable |
| 532 | * |
| 533 | * PARAMETERS: DdbHandle - Handle to a previously loaded table |
| 534 | * |
| 535 | * RETURN: Status |
| 536 | * |
| 537 | * DESCRIPTION: Unload an ACPI table |
| 538 | * |
| 539 | ******************************************************************************/ |
| 540 | |
| 541 | ACPI_STATUS |
| 542 | AcpiExUnloadTable ( |
| 543 | ACPI_OPERAND_OBJECT *DdbHandle) |
| 544 | { |
| 545 | ACPI_STATUS Status = AE_OK; |
| 546 | ACPI_OPERAND_OBJECT *TableDesc = DdbHandle; |
| 547 | UINT32 TableIndex; |
| 548 | ACPI_TABLE_HEADER *Table; |
| 549 | |
| 550 | |
| 551 | ACPI_FUNCTION_TRACE (ExUnloadTable); |
| 552 | |
| 553 | |
| 554 | /* |
| 555 | * Temporarily emit a warning so that the ASL for the machine can be |
| 556 | * hopefully obtained. This is to say that the Unload() operator is |
| 557 | * extremely rare if not completely unused. |
| 558 | */ |
| 559 | ACPI_WARNING ((AE_INFO, |
| 560 | "Received request to unload an ACPI table" )); |
| 561 | |
| 562 | /* |
| 563 | * Validate the handle |
| 564 | * Although the handle is partially validated in AcpiExReconfiguration() |
| 565 | * when it calls AcpiExResolveOperands(), the handle is more completely |
| 566 | * validated here. |
| 567 | * |
| 568 | * Handle must be a valid operand object of type reference. Also, the |
| 569 | * DdbHandle must still be marked valid (table has not been previously |
| 570 | * unloaded) |
| 571 | */ |
| 572 | if ((!DdbHandle) || |
| 573 | (ACPI_GET_DESCRIPTOR_TYPE (DdbHandle) != ACPI_DESC_TYPE_OPERAND) || |
| 574 | (DdbHandle->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) || |
| 575 | (!(DdbHandle->Common.Flags & AOPOBJ_DATA_VALID))) |
| 576 | { |
| 577 | return_ACPI_STATUS (AE_AML_OPERAND_TYPE); |
| 578 | } |
| 579 | |
| 580 | /* Get the table index from the DdbHandle */ |
| 581 | |
| 582 | TableIndex = TableDesc->Reference.Value; |
| 583 | |
| 584 | /* |
| 585 | * Release the interpreter lock so that the table lock won't have |
| 586 | * strict order requirement against it. |
| 587 | */ |
| 588 | AcpiExExitInterpreter (); |
| 589 | |
| 590 | /* Ensure the table is still loaded */ |
| 591 | |
| 592 | if (!AcpiTbIsTableLoaded (TableIndex)) |
| 593 | { |
| 594 | Status = AE_NOT_EXIST; |
| 595 | goto LockAndExit; |
| 596 | } |
| 597 | |
| 598 | /* Invoke table handler if present */ |
| 599 | |
| 600 | if (AcpiGbl_TableHandler) |
| 601 | { |
| 602 | Status = AcpiGetTableByIndex (TableIndex, &Table); |
| 603 | if (ACPI_SUCCESS (Status)) |
| 604 | { |
| 605 | (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_UNLOAD, Table, |
| 606 | AcpiGbl_TableHandlerContext); |
| 607 | } |
| 608 | } |
| 609 | |
| 610 | /* Delete the portion of the namespace owned by this table */ |
| 611 | |
| 612 | Status = AcpiTbDeleteNamespaceByOwner (TableIndex); |
| 613 | if (ACPI_FAILURE (Status)) |
| 614 | { |
| 615 | goto LockAndExit; |
| 616 | } |
| 617 | |
| 618 | (void) AcpiTbReleaseOwnerId (TableIndex); |
| 619 | AcpiTbSetTableLoadedFlag (TableIndex, FALSE); |
| 620 | |
| 621 | LockAndExit: |
| 622 | |
| 623 | /* Re-acquire the interpreter lock */ |
| 624 | |
| 625 | AcpiExEnterInterpreter (); |
| 626 | |
| 627 | /* |
| 628 | * Invalidate the handle. We do this because the handle may be stored |
| 629 | * in a named object and may not be actually deleted until much later. |
| 630 | */ |
| 631 | if (ACPI_SUCCESS (Status)) |
| 632 | { |
| 633 | DdbHandle->Common.Flags &= ~AOPOBJ_DATA_VALID; |
| 634 | } |
| 635 | return_ACPI_STATUS (Status); |
| 636 | } |
| 637 | |