1/****************************************************************************** 2 * 3 * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes) 4 * 5 *****************************************************************************/ 6 7/****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89 * PARTICULAR PURPOSE. 90 * 91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98 * LIMITED REMEDY. 99 * 100 * 4.3. Licensee shall not export, either directly or indirectly, any of this 101 * software or system incorporating such software without first obtaining any 102 * required license or other approval from the U. S. Department of Commerce or 103 * any other agency or department of the United States Government. In the 104 * event Licensee exports any such software from the United States or 105 * re-exports any such software from a foreign destination, Licensee shall 106 * ensure that the distribution and export/re-export of the software is in 107 * compliance with all laws, regulations, orders, or other restrictions of the 108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 109 * any of its subsidiaries will export/re-export any technical data, process, 110 * software, or service, directly or indirectly, to any country for which the 111 * United States government or any agency thereof requires an export license, 112 * other governmental approval, or letter of assurance, without first obtaining 113 * such license, approval or letter. 114 * 115 *****************************************************************************/ 116 117#define __EXCONFIG_C__ 118 119#include <contrib/dev/acpica/include/acpi.h> 120#include <contrib/dev/acpica/include/accommon.h> 121#include <contrib/dev/acpica/include/acinterp.h> 122#include <contrib/dev/acpica/include/acnamesp.h> 123#include <contrib/dev/acpica/include/actables.h> 124#include <contrib/dev/acpica/include/acdispat.h> 125#include <contrib/dev/acpica/include/acevents.h> 126 127 128#define _COMPONENT ACPI_EXECUTER 129 ACPI_MODULE_NAME ("exconfig") 130 131/* Local prototypes */ 132 133static ACPI_STATUS 134AcpiExAddTable ( 135 UINT32 TableIndex, 136 ACPI_NAMESPACE_NODE *ParentNode, 137 ACPI_OPERAND_OBJECT **DdbHandle); 138 139static ACPI_STATUS 140AcpiExRegionRead ( 141 ACPI_OPERAND_OBJECT *ObjDesc, 142 UINT32 Length, 143 UINT8 *Buffer); 144 145 146/******************************************************************************* 147 * 148 * FUNCTION: AcpiExAddTable 149 * 150 * PARAMETERS: Table - Pointer to raw table 151 * ParentNode - Where to load the table (scope) 152 * DdbHandle - Where to return the table handle. 153 * 154 * RETURN: Status 155 * 156 * DESCRIPTION: Common function to Install and Load an ACPI table with a 157 * returned table handle. 158 * 159 ******************************************************************************/ 160 161static ACPI_STATUS 162AcpiExAddTable ( 163 UINT32 TableIndex, 164 ACPI_NAMESPACE_NODE *ParentNode, 165 ACPI_OPERAND_OBJECT **DdbHandle) 166{ 167 ACPI_STATUS Status; 168 ACPI_OPERAND_OBJECT *ObjDesc; 169 170 171 ACPI_FUNCTION_TRACE (ExAddTable); 172 173 174 /* Create an object to be the table handle */ 175 176 ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE); 177 if (!ObjDesc) 178 { 179 return_ACPI_STATUS (AE_NO_MEMORY); 180 } 181 182 /* Init the table handle */ 183 184 ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID; 185 ObjDesc->Reference.Class = ACPI_REFCLASS_TABLE; 186 *DdbHandle = ObjDesc; 187 188 /* Install the new table into the local data structures */ 189 190 ObjDesc->Reference.Value = TableIndex; 191 192 /* Add the table to the namespace */ 193 194 Status = AcpiNsLoadTable (TableIndex, ParentNode); 195 if (ACPI_FAILURE (Status)) 196 { 197 AcpiUtRemoveReference (ObjDesc); 198 *DdbHandle = NULL; 199 return_ACPI_STATUS (Status); 200 } 201 202 /* Execute any module-level code that was found in the table */ 203 204 AcpiExExitInterpreter (); 205 AcpiNsExecModuleCodeList (); 206 AcpiExEnterInterpreter (); 207 208 return_ACPI_STATUS (Status); 209} 210 211 212/******************************************************************************* 213 * 214 * FUNCTION: AcpiExLoadTableOp 215 * 216 * PARAMETERS: WalkState - Current state with operands 217 * ReturnDesc - Where to store the return object 218 * 219 * RETURN: Status 220 * 221 * DESCRIPTION: Load an ACPI table from the RSDT/XSDT 222 * 223 ******************************************************************************/ 224 225ACPI_STATUS 226AcpiExLoadTableOp ( 227 ACPI_WALK_STATE *WalkState, 228 ACPI_OPERAND_OBJECT **ReturnDesc) 229{ 230 ACPI_STATUS Status; 231 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0]; 232 ACPI_NAMESPACE_NODE *ParentNode; 233 ACPI_NAMESPACE_NODE *StartNode; 234 ACPI_NAMESPACE_NODE *ParameterNode = NULL; 235 ACPI_OPERAND_OBJECT *DdbHandle; 236 ACPI_TABLE_HEADER *Table; 237 UINT32 TableIndex; 238 239 240 ACPI_FUNCTION_TRACE (ExLoadTableOp); 241 242 243 /* Validate lengths for the SignatureString, OEMIDString, OEMTableID */ 244 245 if ((Operand[0]->String.Length > ACPI_NAME_SIZE) || 246 (Operand[1]->String.Length > ACPI_OEM_ID_SIZE) || 247 (Operand[2]->String.Length > ACPI_OEM_TABLE_ID_SIZE)) 248 { 249 return_ACPI_STATUS (AE_BAD_PARAMETER); 250 } 251 252 /* Find the ACPI table in the RSDT/XSDT */ 253 254 Status = AcpiTbFindTable (Operand[0]->String.Pointer, 255 Operand[1]->String.Pointer, 256 Operand[2]->String.Pointer, &TableIndex); 257 if (ACPI_FAILURE (Status)) 258 { 259 if (Status != AE_NOT_FOUND) 260 { 261 return_ACPI_STATUS (Status); 262 } 263 264 /* Table not found, return an Integer=0 and AE_OK */ 265
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266 DdbHandle = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
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266 DdbHandle = AcpiUtCreateIntegerObject ((UINT64) 0); |
267 if (!DdbHandle) 268 { 269 return_ACPI_STATUS (AE_NO_MEMORY); 270 } 271
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272 DdbHandle->Integer.Value = 0;
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272 *ReturnDesc = DdbHandle;
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274
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273 return_ACPI_STATUS (AE_OK); 274 } 275 276 /* Default nodes */ 277 278 StartNode = WalkState->ScopeInfo->Scope.Node; 279 ParentNode = AcpiGbl_RootNode; 280 281 /* RootPath (optional parameter) */ 282 283 if (Operand[3]->String.Length > 0) 284 { 285 /* 286 * Find the node referenced by the RootPathString. This is the 287 * location within the namespace where the table will be loaded. 288 */ 289 Status = AcpiNsGetNode (StartNode, Operand[3]->String.Pointer, 290 ACPI_NS_SEARCH_PARENT, &ParentNode); 291 if (ACPI_FAILURE (Status)) 292 { 293 return_ACPI_STATUS (Status); 294 } 295 } 296 297 /* ParameterPath (optional parameter) */ 298 299 if (Operand[4]->String.Length > 0) 300 { 301 if ((Operand[4]->String.Pointer[0] != '\\') && 302 (Operand[4]->String.Pointer[0] != '^')) 303 { 304 /* 305 * Path is not absolute, so it will be relative to the node 306 * referenced by the RootPathString (or the NS root if omitted) 307 */ 308 StartNode = ParentNode; 309 } 310 311 /* Find the node referenced by the ParameterPathString */ 312 313 Status = AcpiNsGetNode (StartNode, Operand[4]->String.Pointer, 314 ACPI_NS_SEARCH_PARENT, &ParameterNode); 315 if (ACPI_FAILURE (Status)) 316 { 317 return_ACPI_STATUS (Status); 318 } 319 } 320 321 /* Load the table into the namespace */ 322 323 Status = AcpiExAddTable (TableIndex, ParentNode, &DdbHandle); 324 if (ACPI_FAILURE (Status)) 325 { 326 return_ACPI_STATUS (Status); 327 } 328 329 /* Parameter Data (optional) */ 330 331 if (ParameterNode) 332 { 333 /* Store the parameter data into the optional parameter object */ 334 335 Status = AcpiExStore (Operand[5], 336 ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParameterNode), 337 WalkState); 338 if (ACPI_FAILURE (Status)) 339 { 340 (void) AcpiExUnloadTable (DdbHandle); 341 342 AcpiUtRemoveReference (DdbHandle); 343 return_ACPI_STATUS (Status); 344 } 345 } 346 347 Status = AcpiGetTableByIndex (TableIndex, &Table); 348 if (ACPI_SUCCESS (Status)) 349 { 350 ACPI_INFO ((AE_INFO, 351 "Dynamic OEM Table Load - [%.4s] OemId [%.6s] OemTableId [%.8s]", 352 Table->Signature, Table->OemId, Table->OemTableId)); 353 } 354 355 /* Invoke table handler if present */ 356 357 if (AcpiGbl_TableHandler) 358 { 359 (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_LOAD, Table, 360 AcpiGbl_TableHandlerContext); 361 } 362 363 *ReturnDesc = DdbHandle; 364 return_ACPI_STATUS (Status); 365} 366 367 368/******************************************************************************* 369 * 370 * FUNCTION: AcpiExRegionRead 371 * 372 * PARAMETERS: ObjDesc - Region descriptor 373 * Length - Number of bytes to read 374 * Buffer - Pointer to where to put the data 375 * 376 * RETURN: Status 377 * 378 * DESCRIPTION: Read data from an operation region. The read starts from the 379 * beginning of the region. 380 * 381 ******************************************************************************/ 382 383static ACPI_STATUS 384AcpiExRegionRead ( 385 ACPI_OPERAND_OBJECT *ObjDesc, 386 UINT32 Length, 387 UINT8 *Buffer) 388{ 389 ACPI_STATUS Status; 390 ACPI_INTEGER Value; 391 UINT32 RegionOffset = 0; 392 UINT32 i; 393 394 395 /* Bytewise reads */ 396 397 for (i = 0; i < Length; i++) 398 { 399 Status = AcpiEvAddressSpaceDispatch (ObjDesc, ACPI_READ, 400 RegionOffset, 8, &Value); 401 if (ACPI_FAILURE (Status)) 402 { 403 return (Status); 404 } 405 406 *Buffer = (UINT8) Value; 407 Buffer++; 408 RegionOffset++; 409 } 410 411 return (AE_OK); 412} 413 414 415/******************************************************************************* 416 * 417 * FUNCTION: AcpiExLoadOp 418 * 419 * PARAMETERS: ObjDesc - Region or Buffer/Field where the table will be 420 * obtained 421 * Target - Where a handle to the table will be stored 422 * WalkState - Current state 423 * 424 * RETURN: Status 425 * 426 * DESCRIPTION: Load an ACPI table from a field or operation region 427 * 428 * NOTE: Region Fields (Field, BankField, IndexFields) are resolved to buffer 429 * objects before this code is reached. 430 * 431 * If source is an operation region, it must refer to SystemMemory, as 432 * per the ACPI specification. 433 * 434 ******************************************************************************/ 435 436ACPI_STATUS 437AcpiExLoadOp ( 438 ACPI_OPERAND_OBJECT *ObjDesc, 439 ACPI_OPERAND_OBJECT *Target, 440 ACPI_WALK_STATE *WalkState) 441{ 442 ACPI_OPERAND_OBJECT *DdbHandle; 443 ACPI_TABLE_HEADER *Table; 444 ACPI_TABLE_DESC TableDesc; 445 UINT32 TableIndex; 446 ACPI_STATUS Status; 447 UINT32 Length; 448 449 450 ACPI_FUNCTION_TRACE (ExLoadOp); 451 452 453 ACPI_MEMSET (&TableDesc, 0, sizeof (ACPI_TABLE_DESC)); 454 455 /* Source Object can be either an OpRegion or a Buffer/Field */ 456 457 switch (ObjDesc->Common.Type) 458 { 459 case ACPI_TYPE_REGION: 460 461 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 462 "Load table from Region %p\n", ObjDesc)); 463 464 /* Region must be SystemMemory (from ACPI spec) */ 465 466 if (ObjDesc->Region.SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY) 467 { 468 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 469 } 470 471 /* 472 * If the Region Address and Length have not been previously evaluated, 473 * evaluate them now and save the results. 474 */ 475 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)) 476 { 477 Status = AcpiDsGetRegionArguments (ObjDesc); 478 if (ACPI_FAILURE (Status)) 479 { 480 return_ACPI_STATUS (Status); 481 } 482 } 483 484 /* Get the table header first so we can get the table length */ 485 486 Table = ACPI_ALLOCATE (sizeof (ACPI_TABLE_HEADER)); 487 if (!Table) 488 { 489 return_ACPI_STATUS (AE_NO_MEMORY); 490 } 491 492 Status = AcpiExRegionRead (ObjDesc, sizeof (ACPI_TABLE_HEADER), 493 ACPI_CAST_PTR (UINT8, Table)); 494 Length = Table->Length; 495 ACPI_FREE (Table); 496 497 if (ACPI_FAILURE (Status)) 498 { 499 return_ACPI_STATUS (Status); 500 } 501 502 /* Must have at least an ACPI table header */ 503 504 if (Length < sizeof (ACPI_TABLE_HEADER)) 505 { 506 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); 507 } 508 509 /* 510 * The original implementation simply mapped the table, with no copy. 511 * However, the memory region is not guaranteed to remain stable and 512 * we must copy the table to a local buffer. For example, the memory 513 * region is corrupted after suspend on some machines. Dynamically 514 * loaded tables are usually small, so this overhead is minimal. 515 * 516 * The latest implementation (5/2009) does not use a mapping at all. 517 * We use the low-level operation region interface to read the table 518 * instead of the obvious optimization of using a direct mapping. 519 * This maintains a consistent use of operation regions across the 520 * entire subsystem. This is important if additional processing must 521 * be performed in the (possibly user-installed) operation region 522 * handler. For example, AcpiExec and ASLTS depend on this. 523 */ 524 525 /* Allocate a buffer for the table */ 526 527 TableDesc.Pointer = ACPI_ALLOCATE (Length); 528 if (!TableDesc.Pointer) 529 { 530 return_ACPI_STATUS (AE_NO_MEMORY); 531 } 532 533 /* Read the entire table */ 534 535 Status = AcpiExRegionRead (ObjDesc, Length, 536 ACPI_CAST_PTR (UINT8, TableDesc.Pointer)); 537 if (ACPI_FAILURE (Status)) 538 { 539 ACPI_FREE (TableDesc.Pointer); 540 return_ACPI_STATUS (Status); 541 } 542 543 TableDesc.Address = ObjDesc->Region.Address; 544 break; 545 546 547 case ACPI_TYPE_BUFFER: /* Buffer or resolved RegionField */ 548 549 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 550 "Load table from Buffer or Field %p\n", ObjDesc)); 551 552 /* Must have at least an ACPI table header */ 553 554 if (ObjDesc->Buffer.Length < sizeof (ACPI_TABLE_HEADER)) 555 { 556 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); 557 } 558 559 /* Get the actual table length from the table header */ 560 561 Table = ACPI_CAST_PTR (ACPI_TABLE_HEADER, ObjDesc->Buffer.Pointer); 562 Length = Table->Length; 563 564 /* Table cannot extend beyond the buffer */ 565 566 if (Length > ObjDesc->Buffer.Length) 567 { 568 return_ACPI_STATUS (AE_AML_BUFFER_LIMIT); 569 } 570 if (Length < sizeof (ACPI_TABLE_HEADER)) 571 { 572 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); 573 } 574 575 /* 576 * Copy the table from the buffer because the buffer could be modified 577 * or even deleted in the future 578 */ 579 TableDesc.Pointer = ACPI_ALLOCATE (Length); 580 if (!TableDesc.Pointer) 581 { 582 return_ACPI_STATUS (AE_NO_MEMORY); 583 } 584 585 ACPI_MEMCPY (TableDesc.Pointer, Table, Length); 586 TableDesc.Address = ACPI_TO_INTEGER (TableDesc.Pointer); 587 break; 588 589 590 default: 591 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 592 } 593 594 /* Validate table checksum (will not get validated in TbAddTable) */ 595 596 Status = AcpiTbVerifyChecksum (TableDesc.Pointer, Length); 597 if (ACPI_FAILURE (Status)) 598 { 599 ACPI_FREE (TableDesc.Pointer); 600 return_ACPI_STATUS (Status); 601 } 602 603 /* Complete the table descriptor */ 604 605 TableDesc.Length = Length; 606 TableDesc.Flags = ACPI_TABLE_ORIGIN_ALLOCATED; 607 608 /* Install the new table into the local data structures */ 609 610 Status = AcpiTbAddTable (&TableDesc, &TableIndex); 611 if (ACPI_FAILURE (Status)) 612 { 613 goto Cleanup; 614 } 615 616 /* 617 * Add the table to the namespace. 618 * 619 * Note: Load the table objects relative to the root of the namespace. 620 * This appears to go against the ACPI specification, but we do it for 621 * compatibility with other ACPI implementations. 622 */ 623 Status = AcpiExAddTable (TableIndex, AcpiGbl_RootNode, &DdbHandle); 624 if (ACPI_FAILURE (Status)) 625 { 626 /* On error, TablePtr was deallocated above */ 627 628 return_ACPI_STATUS (Status); 629 } 630 631 /* Store the DdbHandle into the Target operand */ 632 633 Status = AcpiExStore (DdbHandle, Target, WalkState); 634 if (ACPI_FAILURE (Status)) 635 { 636 (void) AcpiExUnloadTable (DdbHandle); 637 638 /* TablePtr was deallocated above */ 639 640 AcpiUtRemoveReference (DdbHandle); 641 return_ACPI_STATUS (Status); 642 } 643 644 /* Remove the reference by added by AcpiExStore above */ 645 646 AcpiUtRemoveReference (DdbHandle); 647 648 /* Invoke table handler if present */ 649 650 if (AcpiGbl_TableHandler) 651 { 652 (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_LOAD, TableDesc.Pointer, 653 AcpiGbl_TableHandlerContext); 654 } 655 656Cleanup: 657 if (ACPI_FAILURE (Status)) 658 { 659 /* Delete allocated table buffer */ 660 661 AcpiTbDeleteTable (&TableDesc); 662 } 663 return_ACPI_STATUS (Status); 664} 665 666 667/******************************************************************************* 668 * 669 * FUNCTION: AcpiExUnloadTable 670 * 671 * PARAMETERS: DdbHandle - Handle to a previously loaded table 672 * 673 * RETURN: Status 674 * 675 * DESCRIPTION: Unload an ACPI table 676 * 677 ******************************************************************************/ 678 679ACPI_STATUS 680AcpiExUnloadTable ( 681 ACPI_OPERAND_OBJECT *DdbHandle) 682{ 683 ACPI_STATUS Status = AE_OK; 684 ACPI_OPERAND_OBJECT *TableDesc = DdbHandle; 685 UINT32 TableIndex; 686 ACPI_TABLE_HEADER *Table; 687 688 689 ACPI_FUNCTION_TRACE (ExUnloadTable); 690 691 692 /* 693 * Validate the handle 694 * Although the handle is partially validated in AcpiExReconfiguration() 695 * when it calls AcpiExResolveOperands(), the handle is more completely 696 * validated here. 697 * 698 * Handle must be a valid operand object of type reference. Also, the 699 * DdbHandle must still be marked valid (table has not been previously 700 * unloaded) 701 */ 702 if ((!DdbHandle) || 703 (ACPI_GET_DESCRIPTOR_TYPE (DdbHandle) != ACPI_DESC_TYPE_OPERAND) || 704 (DdbHandle->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) || 705 (!(DdbHandle->Common.Flags & AOPOBJ_DATA_VALID))) 706 { 707 return_ACPI_STATUS (AE_BAD_PARAMETER); 708 } 709 710 /* Get the table index from the DdbHandle */ 711 712 TableIndex = TableDesc->Reference.Value; 713 714 /* Ensure the table is still loaded */ 715 716 if (!AcpiTbIsTableLoaded (TableIndex)) 717 { 718 return_ACPI_STATUS (AE_NOT_EXIST); 719 } 720 721 /* Invoke table handler if present */ 722 723 if (AcpiGbl_TableHandler) 724 { 725 Status = AcpiGetTableByIndex (TableIndex, &Table); 726 if (ACPI_SUCCESS (Status)) 727 { 728 (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_UNLOAD, Table, 729 AcpiGbl_TableHandlerContext); 730 } 731 } 732 733 /* Delete the portion of the namespace owned by this table */ 734 735 Status = AcpiTbDeleteNamespaceByOwner (TableIndex); 736 if (ACPI_FAILURE (Status)) 737 { 738 return_ACPI_STATUS (Status); 739 } 740 741 (void) AcpiTbReleaseOwnerId (TableIndex); 742 AcpiTbSetTableLoadedFlag (TableIndex, FALSE); 743 744 /* 745 * Invalidate the handle. We do this because the handle may be stored 746 * in a named object and may not be actually deleted until much later. 747 */ 748 DdbHandle->Common.Flags &= ~AOPOBJ_DATA_VALID; 749 return_ACPI_STATUS (AE_OK); 750} 751
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