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 - 2018, 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 * Alternatively, you may choose to be licensed under the terms of the 118 * following license: 119 * 120 * Redistribution and use in source and binary forms, with or without 121 * modification, are permitted provided that the following conditions 122 * are met: 123 * 1. Redistributions of source code must retain the above copyright 124 * notice, this list of conditions, and the following disclaimer, 125 * without modification. 126 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 127 * substantially similar to the "NO WARRANTY" disclaimer below 128 * ("Disclaimer") and any redistribution must be conditioned upon 129 * including a substantially similar Disclaimer requirement for further 130 * binary redistribution. 131 * 3. Neither the names of the above-listed copyright holders nor the names 132 * of any contributors may be used to endorse or promote products derived 133 * from this software without specific prior written permission. 134 * 135 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 136 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 137 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 138 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 139 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 140 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 141 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 142 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 143 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 144 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 145 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 146 * 147 * Alternatively, you may choose to be licensed under the terms of the 148 * GNU General Public License ("GPL") version 2 as published by the Free 149 * Software Foundation. 150 * 151 *****************************************************************************/ 152 153 #include <contrib/dev/acpica/include/acpi.h> 154 #include <contrib/dev/acpica/include/accommon.h> 155 #include <contrib/dev/acpica/include/acinterp.h> 156 #include <contrib/dev/acpica/include/acnamesp.h> 157 #include <contrib/dev/acpica/include/actables.h> 158 #include <contrib/dev/acpica/include/acdispat.h> 159 #include <contrib/dev/acpica/include/acevents.h> 160 #include <contrib/dev/acpica/include/amlcode.h> 161 162 163 #define _COMPONENT ACPI_EXECUTER 164 ACPI_MODULE_NAME ("exconfig") 165 166 /* Local prototypes */ 167 168 static ACPI_STATUS 169 AcpiExAddTable ( 170 UINT32 TableIndex, 171 ACPI_OPERAND_OBJECT **DdbHandle); 172 173 static ACPI_STATUS 174 AcpiExRegionRead ( 175 ACPI_OPERAND_OBJECT *ObjDesc, 176 UINT32 Length, 177 UINT8 *Buffer); 178 179 180 /******************************************************************************* 181 * 182 * FUNCTION: AcpiExAddTable 183 * 184 * PARAMETERS: Table - Pointer to raw table 185 * ParentNode - Where to load the table (scope) 186 * DdbHandle - Where to return the table handle. 187 * 188 * RETURN: Status 189 * 190 * DESCRIPTION: Common function to Install and Load an ACPI table with a 191 * returned table handle. 192 * 193 ******************************************************************************/ 194 195 static ACPI_STATUS 196 AcpiExAddTable ( 197 UINT32 TableIndex, 198 ACPI_OPERAND_OBJECT **DdbHandle) 199 { 200 ACPI_OPERAND_OBJECT *ObjDesc; 201 202 203 ACPI_FUNCTION_TRACE (ExAddTable); 204 205 206 /* Create an object to be the table handle */ 207 208 ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE); 209 if (!ObjDesc) 210 { 211 return_ACPI_STATUS (AE_NO_MEMORY); 212 } 213 214 /* Init the table handle */ 215 216 ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID; 217 ObjDesc->Reference.Class = ACPI_REFCLASS_TABLE; 218 ObjDesc->Reference.Value = TableIndex; 219 *DdbHandle = ObjDesc; 220 return_ACPI_STATUS (AE_OK); 221 } 222 223 224 /******************************************************************************* 225 * 226 * FUNCTION: AcpiExLoadTableOp 227 * 228 * PARAMETERS: WalkState - Current state with operands 229 * ReturnDesc - Where to store the return object 230 * 231 * RETURN: Status 232 * 233 * DESCRIPTION: Load an ACPI table from the RSDT/XSDT 234 * 235 ******************************************************************************/ 236 237 ACPI_STATUS 238 AcpiExLoadTableOp ( 239 ACPI_WALK_STATE *WalkState, 240 ACPI_OPERAND_OBJECT **ReturnDesc) 241 { 242 ACPI_STATUS Status; 243 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0]; 244 ACPI_NAMESPACE_NODE *ParentNode; 245 ACPI_NAMESPACE_NODE *StartNode; 246 ACPI_NAMESPACE_NODE *ParameterNode = NULL; 247 ACPI_OPERAND_OBJECT *DdbHandle; 248 UINT32 TableIndex; 249 250 251 ACPI_FUNCTION_TRACE (ExLoadTableOp); 252 253 254 /* Find the ACPI table in the RSDT/XSDT */ 255 256 AcpiExExitInterpreter (); 257 Status = AcpiTbFindTable ( 258 Operand[0]->String.Pointer, 259 Operand[1]->String.Pointer, 260 Operand[2]->String.Pointer, &TableIndex); 261 AcpiExEnterInterpreter (); 262 if (ACPI_FAILURE (Status)) 263 { 264 if (Status != AE_NOT_FOUND) 265 { 266 return_ACPI_STATUS (Status); 267 } 268 269 /* Table not found, return an Integer=0 and AE_OK */ 270 271 DdbHandle = AcpiUtCreateIntegerObject ((UINT64) 0); 272 if (!DdbHandle) 273 { 274 return_ACPI_STATUS (AE_NO_MEMORY); 275 } 276 277 *ReturnDesc = DdbHandle; 278 return_ACPI_STATUS (AE_OK); 279 } 280 281 /* Default nodes */ 282 283 StartNode = WalkState->ScopeInfo->Scope.Node; 284 ParentNode = AcpiGbl_RootNode; 285 286 /* RootPath (optional parameter) */ 287 288 if (Operand[3]->String.Length > 0) 289 { 290 /* 291 * Find the node referenced by the RootPathString. This is the 292 * location within the namespace where the table will be loaded. 293 */ 294 Status = AcpiNsGetNodeUnlocked (StartNode, 295 Operand[3]->String.Pointer, ACPI_NS_SEARCH_PARENT, 296 &ParentNode); 297 if (ACPI_FAILURE (Status)) 298 { 299 return_ACPI_STATUS (Status); 300 } 301 } 302 303 /* ParameterPath (optional parameter) */ 304 305 if (Operand[4]->String.Length > 0) 306 { 307 if ((Operand[4]->String.Pointer[0] != AML_ROOT_PREFIX) && 308 (Operand[4]->String.Pointer[0] != AML_PARENT_PREFIX)) 309 { 310 /* 311 * Path is not absolute, so it will be relative to the node 312 * referenced by the RootPathString (or the NS root if omitted) 313 */ 314 StartNode = ParentNode; 315 } 316 317 /* Find the node referenced by the ParameterPathString */ 318 319 Status = AcpiNsGetNodeUnlocked (StartNode, 320 Operand[4]->String.Pointer, ACPI_NS_SEARCH_PARENT, 321 &ParameterNode); 322 if (ACPI_FAILURE (Status)) 323 { 324 return_ACPI_STATUS (Status); 325 } 326 } 327 328 /* Load the table into the namespace */ 329 330 ACPI_INFO (("Dynamic OEM Table Load:")); 331 AcpiExExitInterpreter (); 332 Status = AcpiTbLoadTable (TableIndex, ParentNode); 333 AcpiExEnterInterpreter (); 334 if (ACPI_FAILURE (Status)) 335 { 336 return_ACPI_STATUS (Status); 337 } 338 339 Status = AcpiExAddTable (TableIndex, &DdbHandle); 340 if (ACPI_FAILURE (Status)) 341 { 342 return_ACPI_STATUS (Status); 343 } 344 345 /* Parameter Data (optional) */ 346 347 if (ParameterNode) 348 { 349 /* Store the parameter data into the optional parameter object */ 350 351 Status = AcpiExStore (Operand[5], 352 ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParameterNode), WalkState); 353 if (ACPI_FAILURE (Status)) 354 { 355 (void) AcpiExUnloadTable (DdbHandle); 356 357 AcpiUtRemoveReference (DdbHandle); 358 return_ACPI_STATUS (Status); 359 } 360 } 361 362 *ReturnDesc = DdbHandle; 363 return_ACPI_STATUS (Status); 364 } 365 366 367 /******************************************************************************* 368 * 369 * FUNCTION: AcpiExRegionRead 370 * 371 * PARAMETERS: ObjDesc - Region descriptor 372 * Length - Number of bytes to read 373 * Buffer - Pointer to where to put the data 374 * 375 * RETURN: Status 376 * 377 * DESCRIPTION: Read data from an operation region. The read starts from the 378 * beginning of the region. 379 * 380 ******************************************************************************/ 381 382 static ACPI_STATUS 383 AcpiExRegionRead ( 384 ACPI_OPERAND_OBJECT *ObjDesc, 385 UINT32 Length, 386 UINT8 *Buffer) 387 { 388 ACPI_STATUS Status; 389 UINT64 Value; 390 UINT32 RegionOffset = 0; 391 UINT32 i; 392 393 394 /* Bytewise reads */ 395 396 for (i = 0; i < Length; i++) 397 { 398 Status = AcpiEvAddressSpaceDispatch (ObjDesc, NULL, ACPI_READ, 399 RegionOffset, 8, &Value); 400 if (ACPI_FAILURE (Status)) 401 { 402 return (Status); 403 } 404 405 *Buffer = (UINT8) Value; 406 Buffer++; 407 RegionOffset++; 408 } 409 410 return (AE_OK); 411 } 412 413 414 /******************************************************************************* 415 * 416 * FUNCTION: AcpiExLoadOp 417 * 418 * PARAMETERS: ObjDesc - Region or Buffer/Field where the table will be 419 * obtained 420 * Target - Where a handle to the table will be stored 421 * WalkState - Current state 422 * 423 * RETURN: Status 424 * 425 * DESCRIPTION: Load an ACPI table from a field or operation region 426 * 427 * NOTE: Region Fields (Field, BankField, IndexFields) are resolved to buffer 428 * objects before this code is reached. 429 * 430 * If source is an operation region, it must refer to SystemMemory, as 431 * per the ACPI specification. 432 * 433 ******************************************************************************/ 434 435 ACPI_STATUS 436 AcpiExLoadOp ( 437 ACPI_OPERAND_OBJECT *ObjDesc, 438 ACPI_OPERAND_OBJECT *Target, 439 ACPI_WALK_STATE *WalkState) 440 { 441 ACPI_OPERAND_OBJECT *DdbHandle; 442 ACPI_TABLE_HEADER *TableHeader; 443 ACPI_TABLE_HEADER *Table; 444 UINT32 TableIndex; 445 ACPI_STATUS Status; 446 UINT32 Length; 447 448 449 ACPI_FUNCTION_TRACE (ExLoadOp); 450 451 452 /* Source Object can be either an OpRegion or a Buffer/Field */ 453 454 switch (ObjDesc->Common.Type) 455 { 456 case ACPI_TYPE_REGION: 457 458 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 459 "Load table from Region %p\n", ObjDesc)); 460 461 /* Region must be SystemMemory (from ACPI spec) */ 462 463 if (ObjDesc->Region.SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY) 464 { 465 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 466 } 467 468 /* 469 * If the Region Address and Length have not been previously 470 * evaluated, evaluate them now and save the results. 471 */ 472 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)) 473 { 474 Status = AcpiDsGetRegionArguments (ObjDesc); 475 if (ACPI_FAILURE (Status)) 476 { 477 return_ACPI_STATUS (Status); 478 } 479 } 480 481 /* Get the table header first so we can get the table length */ 482 483 TableHeader = ACPI_ALLOCATE (sizeof (ACPI_TABLE_HEADER)); 484 if (!TableHeader) 485 { 486 return_ACPI_STATUS (AE_NO_MEMORY); 487 } 488 489 Status = AcpiExRegionRead (ObjDesc, sizeof (ACPI_TABLE_HEADER), 490 ACPI_CAST_PTR (UINT8, TableHeader)); 491 Length = TableHeader->Length; 492 ACPI_FREE (TableHeader); 493 494 if (ACPI_FAILURE (Status)) 495 { 496 return_ACPI_STATUS (Status); 497 } 498 499 /* Must have at least an ACPI table header */ 500 501 if (Length < sizeof (ACPI_TABLE_HEADER)) 502 { 503 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); 504 } 505 506 /* 507 * The original implementation simply mapped the table, with no copy. 508 * However, the memory region is not guaranteed to remain stable and 509 * we must copy the table to a local buffer. For example, the memory 510 * region is corrupted after suspend on some machines. Dynamically 511 * loaded tables are usually small, so this overhead is minimal. 512 * 513 * The latest implementation (5/2009) does not use a mapping at all. 514 * We use the low-level operation region interface to read the table 515 * instead of the obvious optimization of using a direct mapping. 516 * This maintains a consistent use of operation regions across the 517 * entire subsystem. This is important if additional processing must 518 * be performed in the (possibly user-installed) operation region 519 * handler. For example, AcpiExec and ASLTS depend on this. 520 */ 521 522 /* Allocate a buffer for the table */ 523 524 Table = ACPI_ALLOCATE (Length); 525 if (!Table) 526 { 527 return_ACPI_STATUS (AE_NO_MEMORY); 528 } 529 530 /* Read the entire table */ 531 532 Status = AcpiExRegionRead (ObjDesc, Length, 533 ACPI_CAST_PTR (UINT8, Table)); 534 if (ACPI_FAILURE (Status)) 535 { 536 ACPI_FREE (Table); 537 return_ACPI_STATUS (Status); 538 } 539 break; 540 541 case ACPI_TYPE_BUFFER: /* Buffer or resolved RegionField */ 542 543 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 544 "Load table from Buffer or Field %p\n", ObjDesc)); 545 546 /* Must have at least an ACPI table header */ 547 548 if (ObjDesc->Buffer.Length < sizeof (ACPI_TABLE_HEADER)) 549 { 550 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); 551 } 552 553 /* Get the actual table length from the table header */ 554 555 TableHeader = ACPI_CAST_PTR ( 556 ACPI_TABLE_HEADER, ObjDesc->Buffer.Pointer); 557 Length = TableHeader->Length; 558 559 /* Table cannot extend beyond the buffer */ 560 561 if (Length > ObjDesc->Buffer.Length) 562 { 563 return_ACPI_STATUS (AE_AML_BUFFER_LIMIT); 564 } 565 if (Length < sizeof (ACPI_TABLE_HEADER)) 566 { 567 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); 568 } 569 570 /* 571 * Copy the table from the buffer because the buffer could be 572 * modified or even deleted in the future 573 */ 574 Table = ACPI_ALLOCATE (Length); 575 if (!Table) 576 { 577 return_ACPI_STATUS (AE_NO_MEMORY); 578 } 579 580 memcpy (Table, TableHeader, Length); 581 break; 582 583 default: 584 585 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 586 } 587 588 /* Install the new table into the local data structures */ 589 590 ACPI_INFO (("Dynamic OEM Table Load:")); 591 AcpiExExitInterpreter (); 592 Status = AcpiTbInstallAndLoadTable (ACPI_PTR_TO_PHYSADDR (Table), 593 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, TRUE, &TableIndex); 594 AcpiExEnterInterpreter (); 595 if (ACPI_FAILURE (Status)) 596 { 597 /* Delete allocated table buffer */ 598 599 ACPI_FREE (Table); 600 return_ACPI_STATUS (Status); 601 } 602 603 /* 604 * Add the table to the namespace. 605 * 606 * Note: Load the table objects relative to the root of the namespace. 607 * This appears to go against the ACPI specification, but we do it for 608 * compatibility with other ACPI implementations. 609 */ 610 Status = AcpiExAddTable (TableIndex, &DdbHandle); 611 if (ACPI_FAILURE (Status)) 612 { 613 /* On error, TablePtr was deallocated above */ 614 615 return_ACPI_STATUS (Status); 616 } 617 618 /* Store the DdbHandle into the Target operand */ 619 620 Status = AcpiExStore (DdbHandle, Target, WalkState); 621 if (ACPI_FAILURE (Status)) 622 { 623 (void) AcpiExUnloadTable (DdbHandle); 624 625 /* TablePtr was deallocated above */ 626 627 AcpiUtRemoveReference (DdbHandle); 628 return_ACPI_STATUS (Status); 629 } 630 631 /* Remove the reference by added by AcpiExStore above */ 632 633 AcpiUtRemoveReference (DdbHandle); 634 return_ACPI_STATUS (Status); 635 } 636 637 638 /******************************************************************************* 639 * 640 * FUNCTION: AcpiExUnloadTable 641 * 642 * PARAMETERS: DdbHandle - Handle to a previously loaded table 643 * 644 * RETURN: Status 645 * 646 * DESCRIPTION: Unload an ACPI table 647 * 648 ******************************************************************************/ 649 650 ACPI_STATUS 651 AcpiExUnloadTable ( 652 ACPI_OPERAND_OBJECT *DdbHandle) 653 { 654 ACPI_STATUS Status = AE_OK; 655 ACPI_OPERAND_OBJECT *TableDesc = DdbHandle; 656 UINT32 TableIndex; 657 658 659 ACPI_FUNCTION_TRACE (ExUnloadTable); 660 661 662 /* 663 * Temporarily emit a warning so that the ASL for the machine can be 664 * hopefully obtained. This is to say that the Unload() operator is 665 * extremely rare if not completely unused. 666 */ 667 ACPI_WARNING ((AE_INFO, 668 "Received request to unload an ACPI table")); 669 670 /* 671 * Validate the handle 672 * Although the handle is partially validated in AcpiExReconfiguration() 673 * when it calls AcpiExResolveOperands(), the handle is more completely 674 * validated here. 675 * 676 * Handle must be a valid operand object of type reference. Also, the 677 * DdbHandle must still be marked valid (table has not been previously 678 * unloaded) 679 */ 680 if ((!DdbHandle) || 681 (ACPI_GET_DESCRIPTOR_TYPE (DdbHandle) != ACPI_DESC_TYPE_OPERAND) || 682 (DdbHandle->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) || 683 (!(DdbHandle->Common.Flags & AOPOBJ_DATA_VALID))) 684 { 685 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 686 } 687 688 /* Get the table index from the DdbHandle */ 689 690 TableIndex = TableDesc->Reference.Value; 691 692 /* 693 * Release the interpreter lock so that the table lock won't have 694 * strict order requirement against it. 695 */ 696 AcpiExExitInterpreter (); 697 Status = AcpiTbUnloadTable (TableIndex); 698 AcpiExEnterInterpreter (); 699 700 /* 701 * Invalidate the handle. We do this because the handle may be stored 702 * in a named object and may not be actually deleted until much later. 703 */ 704 if (ACPI_SUCCESS (Status)) 705 { 706 DdbHandle->Common.Flags &= ~AOPOBJ_DATA_VALID; 707 } 708 return_ACPI_STATUS (Status); 709 } 710