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 "acpi.h" 154 #include "accommon.h" 155 #include "acinterp.h" 156 #include "acnamesp.h" 157 #include "actables.h" 158 #include "acdispat.h" 159 #include "acevents.h" 160 #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 /* Complete the initialization/resolution of package objects */ 346 347 Status = AcpiNsWalkNamespace (ACPI_TYPE_PACKAGE, ACPI_ROOT_OBJECT, 348 ACPI_UINT32_MAX, 0, AcpiNsInitOnePackage, NULL, NULL, NULL); 349 350 /* Parameter Data (optional) */ 351 352 if (ParameterNode) 353 { 354 /* Store the parameter data into the optional parameter object */ 355 356 Status = AcpiExStore (Operand[5], 357 ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParameterNode), WalkState); 358 if (ACPI_FAILURE (Status)) 359 { 360 (void) AcpiExUnloadTable (DdbHandle); 361 362 AcpiUtRemoveReference (DdbHandle); 363 return_ACPI_STATUS (Status); 364 } 365 } 366 367 *ReturnDesc = DdbHandle; 368 return_ACPI_STATUS (Status); 369 } 370 371 372 /******************************************************************************* 373 * 374 * FUNCTION: AcpiExRegionRead 375 * 376 * PARAMETERS: ObjDesc - Region descriptor 377 * Length - Number of bytes to read 378 * Buffer - Pointer to where to put the data 379 * 380 * RETURN: Status 381 * 382 * DESCRIPTION: Read data from an operation region. The read starts from the 383 * beginning of the region. 384 * 385 ******************************************************************************/ 386 387 static ACPI_STATUS 388 AcpiExRegionRead ( 389 ACPI_OPERAND_OBJECT *ObjDesc, 390 UINT32 Length, 391 UINT8 *Buffer) 392 { 393 ACPI_STATUS Status; 394 UINT64 Value; 395 UINT32 RegionOffset = 0; 396 UINT32 i; 397 398 399 /* Bytewise reads */ 400 401 for (i = 0; i < Length; i++) 402 { 403 Status = AcpiEvAddressSpaceDispatch (ObjDesc, NULL, ACPI_READ, 404 RegionOffset, 8, &Value); 405 if (ACPI_FAILURE (Status)) 406 { 407 return (Status); 408 } 409 410 *Buffer = (UINT8) Value; 411 Buffer++; 412 RegionOffset++; 413 } 414 415 return (AE_OK); 416 } 417 418 419 /******************************************************************************* 420 * 421 * FUNCTION: AcpiExLoadOp 422 * 423 * PARAMETERS: ObjDesc - Region or Buffer/Field where the table will be 424 * obtained 425 * Target - Where a handle to the table will be stored 426 * WalkState - Current state 427 * 428 * RETURN: Status 429 * 430 * DESCRIPTION: Load an ACPI table from a field or operation region 431 * 432 * NOTE: Region Fields (Field, BankField, IndexFields) are resolved to buffer 433 * objects before this code is reached. 434 * 435 * If source is an operation region, it must refer to SystemMemory, as 436 * per the ACPI specification. 437 * 438 ******************************************************************************/ 439 440 ACPI_STATUS 441 AcpiExLoadOp ( 442 ACPI_OPERAND_OBJECT *ObjDesc, 443 ACPI_OPERAND_OBJECT *Target, 444 ACPI_WALK_STATE *WalkState) 445 { 446 ACPI_OPERAND_OBJECT *DdbHandle; 447 ACPI_TABLE_HEADER *TableHeader; 448 ACPI_TABLE_HEADER *Table; 449 UINT32 TableIndex; 450 ACPI_STATUS Status; 451 UINT32 Length; 452 453 454 ACPI_FUNCTION_TRACE (ExLoadOp); 455 456 457 /* Source Object can be either an OpRegion or a Buffer/Field */ 458 459 switch (ObjDesc->Common.Type) 460 { 461 case ACPI_TYPE_REGION: 462 463 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 464 "Load table from Region %p\n", ObjDesc)); 465 466 /* Region must be SystemMemory (from ACPI spec) */ 467 468 if (ObjDesc->Region.SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY) 469 { 470 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 471 } 472 473 /* 474 * If the Region Address and Length have not been previously 475 * evaluated, evaluate them now and save the results. 476 */ 477 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID)) 478 { 479 Status = AcpiDsGetRegionArguments (ObjDesc); 480 if (ACPI_FAILURE (Status)) 481 { 482 return_ACPI_STATUS (Status); 483 } 484 } 485 486 /* Get the table header first so we can get the table length */ 487 488 TableHeader = ACPI_ALLOCATE (sizeof (ACPI_TABLE_HEADER)); 489 if (!TableHeader) 490 { 491 return_ACPI_STATUS (AE_NO_MEMORY); 492 } 493 494 Status = AcpiExRegionRead (ObjDesc, sizeof (ACPI_TABLE_HEADER), 495 ACPI_CAST_PTR (UINT8, TableHeader)); 496 Length = TableHeader->Length; 497 ACPI_FREE (TableHeader); 498 499 if (ACPI_FAILURE (Status)) 500 { 501 return_ACPI_STATUS (Status); 502 } 503 504 /* Must have at least an ACPI table header */ 505 506 if (Length < sizeof (ACPI_TABLE_HEADER)) 507 { 508 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); 509 } 510 511 /* 512 * The original implementation simply mapped the table, with no copy. 513 * However, the memory region is not guaranteed to remain stable and 514 * we must copy the table to a local buffer. For example, the memory 515 * region is corrupted after suspend on some machines. Dynamically 516 * loaded tables are usually small, so this overhead is minimal. 517 * 518 * The latest implementation (5/2009) does not use a mapping at all. 519 * We use the low-level operation region interface to read the table 520 * instead of the obvious optimization of using a direct mapping. 521 * This maintains a consistent use of operation regions across the 522 * entire subsystem. This is important if additional processing must 523 * be performed in the (possibly user-installed) operation region 524 * handler. For example, AcpiExec and ASLTS depend on this. 525 */ 526 527 /* Allocate a buffer for the table */ 528 529 Table = ACPI_ALLOCATE (Length); 530 if (!Table) 531 { 532 return_ACPI_STATUS (AE_NO_MEMORY); 533 } 534 535 /* Read the entire table */ 536 537 Status = AcpiExRegionRead (ObjDesc, Length, 538 ACPI_CAST_PTR (UINT8, Table)); 539 if (ACPI_FAILURE (Status)) 540 { 541 ACPI_FREE (Table); 542 return_ACPI_STATUS (Status); 543 } 544 break; 545 546 case ACPI_TYPE_BUFFER: /* Buffer or resolved RegionField */ 547 548 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 549 "Load table from Buffer or Field %p\n", ObjDesc)); 550 551 /* Must have at least an ACPI table header */ 552 553 if (ObjDesc->Buffer.Length < sizeof (ACPI_TABLE_HEADER)) 554 { 555 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH); 556 } 557 558 /* Get the actual table length from the table header */ 559 560 TableHeader = ACPI_CAST_PTR ( 561 ACPI_TABLE_HEADER, ObjDesc->Buffer.Pointer); 562 Length = TableHeader->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 577 * modified or even deleted in the future 578 */ 579 Table = ACPI_ALLOCATE (Length); 580 if (!Table) 581 { 582 return_ACPI_STATUS (AE_NO_MEMORY); 583 } 584 585 memcpy (Table, TableHeader, Length); 586 break; 587 588 default: 589 590 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 591 } 592 593 /* Install the new table into the local data structures */ 594 595 ACPI_INFO (("Dynamic OEM Table Load:")); 596 AcpiExExitInterpreter (); 597 Status = AcpiTbInstallAndLoadTable (ACPI_PTR_TO_PHYSADDR (Table), 598 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, TRUE, &TableIndex); 599 AcpiExEnterInterpreter (); 600 if (ACPI_FAILURE (Status)) 601 { 602 /* Delete allocated table buffer */ 603 604 ACPI_FREE (Table); 605 return_ACPI_STATUS (Status); 606 } 607 608 /* 609 * Add the table to the namespace. 610 * 611 * Note: Load the table objects relative to the root of the namespace. 612 * This appears to go against the ACPI specification, but we do it for 613 * compatibility with other ACPI implementations. 614 */ 615 Status = AcpiExAddTable (TableIndex, &DdbHandle); 616 if (ACPI_FAILURE (Status)) 617 { 618 /* On error, TablePtr was deallocated above */ 619 620 return_ACPI_STATUS (Status); 621 } 622 623 /* Complete the initialization/resolution of package objects */ 624 625 Status = AcpiNsWalkNamespace (ACPI_TYPE_PACKAGE, ACPI_ROOT_OBJECT, 626 ACPI_UINT32_MAX, 0, AcpiNsInitOnePackage, NULL, NULL, NULL); 627 628 /* Store the DdbHandle into the Target operand */ 629 630 Status = AcpiExStore (DdbHandle, Target, WalkState); 631 if (ACPI_FAILURE (Status)) 632 { 633 (void) AcpiExUnloadTable (DdbHandle); 634 635 /* TablePtr was deallocated above */ 636 637 AcpiUtRemoveReference (DdbHandle); 638 return_ACPI_STATUS (Status); 639 } 640 641 /* Remove the reference by added by AcpiExStore above */ 642 643 AcpiUtRemoveReference (DdbHandle); 644 return_ACPI_STATUS (Status); 645 } 646 647 648 /******************************************************************************* 649 * 650 * FUNCTION: AcpiExUnloadTable 651 * 652 * PARAMETERS: DdbHandle - Handle to a previously loaded table 653 * 654 * RETURN: Status 655 * 656 * DESCRIPTION: Unload an ACPI table 657 * 658 ******************************************************************************/ 659 660 ACPI_STATUS 661 AcpiExUnloadTable ( 662 ACPI_OPERAND_OBJECT *DdbHandle) 663 { 664 ACPI_STATUS Status = AE_OK; 665 ACPI_OPERAND_OBJECT *TableDesc = DdbHandle; 666 UINT32 TableIndex; 667 668 669 ACPI_FUNCTION_TRACE (ExUnloadTable); 670 671 672 /* 673 * Temporarily emit a warning so that the ASL for the machine can be 674 * hopefully obtained. This is to say that the Unload() operator is 675 * extremely rare if not completely unused. 676 */ 677 ACPI_WARNING ((AE_INFO, 678 "Received request to unload an ACPI table")); 679 680 /* 681 * May 2018: Unload is no longer supported for the following reasons: 682 * 1) A correct implementation on some hosts may not be possible. 683 * 2) Other ACPI implementations do not correctly/fully support it. 684 * 3) It requires host device driver support which does not exist. 685 * (To properly support namespace unload out from underneath.) 686 * 4) This AML operator has never been seen in the field. 687 */ 688 ACPI_EXCEPTION ((AE_INFO, AE_NOT_IMPLEMENTED, 689 "AML Unload operator is not supported")); 690 691 /* 692 * Validate the handle 693 * Although the handle is partially validated in AcpiExReconfiguration() 694 * when it calls AcpiExResolveOperands(), the handle is more completely 695 * validated here. 696 * 697 * Handle must be a valid operand object of type reference. Also, the 698 * DdbHandle must still be marked valid (table has not been previously 699 * unloaded) 700 */ 701 if ((!DdbHandle) || 702 (ACPI_GET_DESCRIPTOR_TYPE (DdbHandle) != ACPI_DESC_TYPE_OPERAND) || 703 (DdbHandle->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) || 704 (!(DdbHandle->Common.Flags & AOPOBJ_DATA_VALID))) 705 { 706 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 707 } 708 709 /* Get the table index from the DdbHandle */ 710 711 TableIndex = TableDesc->Reference.Value; 712 713 /* 714 * Release the interpreter lock so that the table lock won't have 715 * strict order requirement against it. 716 */ 717 AcpiExExitInterpreter (); 718 Status = AcpiTbUnloadTable (TableIndex); 719 AcpiExEnterInterpreter (); 720 721 /* 722 * Invalidate the handle. We do this because the handle may be stored 723 * in a named object and may not be actually deleted until much later. 724 */ 725 if (ACPI_SUCCESS (Status)) 726 { 727 DdbHandle->Common.Flags &= ~AOPOBJ_DATA_VALID; 728 } 729 return_ACPI_STATUS (Status); 730 } 731