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 - 2021, 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
AcpiExAddTable(UINT32 TableIndex,ACPI_OPERAND_OBJECT ** DdbHandle)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
AcpiExLoadTableOp(ACPI_WALK_STATE * WalkState,ACPI_OPERAND_OBJECT ** ReturnDesc)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 new objects */
346
347 AcpiExExitInterpreter();
348 AcpiNsInitializeObjects();
349 AcpiExEnterInterpreter();
350
351 /* Parameter Data (optional) */
352
353 if (ParameterNode)
354 {
355 /* Store the parameter data into the optional parameter object */
356
357 Status = AcpiExStore (Operand[5],
358 ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParameterNode), WalkState);
359 if (ACPI_FAILURE (Status))
360 {
361 (void) AcpiExUnloadTable (DdbHandle);
362
363 AcpiUtRemoveReference (DdbHandle);
364 return_ACPI_STATUS (Status);
365 }
366 }
367
368 *ReturnDesc = DdbHandle;
369 return_ACPI_STATUS (Status);
370 }
371
372
373 /*******************************************************************************
374 *
375 * FUNCTION: AcpiExRegionRead
376 *
377 * PARAMETERS: ObjDesc - Region descriptor
378 * Length - Number of bytes to read
379 * Buffer - Pointer to where to put the data
380 *
381 * RETURN: Status
382 *
383 * DESCRIPTION: Read data from an operation region. The read starts from the
384 * beginning of the region.
385 *
386 ******************************************************************************/
387
388 static ACPI_STATUS
AcpiExRegionRead(ACPI_OPERAND_OBJECT * ObjDesc,UINT32 Length,UINT8 * Buffer)389 AcpiExRegionRead (
390 ACPI_OPERAND_OBJECT *ObjDesc,
391 UINT32 Length,
392 UINT8 *Buffer)
393 {
394 ACPI_STATUS Status;
395 UINT64 Value;
396 UINT32 RegionOffset = 0;
397 UINT32 i;
398
399
400 /* Bytewise reads */
401
402 for (i = 0; i < Length; i++)
403 {
404 Status = AcpiEvAddressSpaceDispatch (ObjDesc, NULL, ACPI_READ,
405 RegionOffset, 8, &Value);
406 if (ACPI_FAILURE (Status))
407 {
408 return (Status);
409 }
410
411 *Buffer = (UINT8) Value;
412 Buffer++;
413 RegionOffset++;
414 }
415
416 return (AE_OK);
417 }
418
419
420 /*******************************************************************************
421 *
422 * FUNCTION: AcpiExLoadOp
423 *
424 * PARAMETERS: ObjDesc - Region or Buffer/Field where the table will be
425 * obtained
426 * Target - Where a handle to the table will be stored
427 * WalkState - Current state
428 *
429 * RETURN: Status
430 *
431 * DESCRIPTION: Load an ACPI table from a field or operation region
432 *
433 * NOTE: Region Fields (Field, BankField, IndexFields) are resolved to buffer
434 * objects before this code is reached.
435 *
436 * If source is an operation region, it must refer to SystemMemory, as
437 * per the ACPI specification.
438 *
439 ******************************************************************************/
440
441 ACPI_STATUS
AcpiExLoadOp(ACPI_OPERAND_OBJECT * ObjDesc,ACPI_OPERAND_OBJECT * Target,ACPI_WALK_STATE * WalkState)442 AcpiExLoadOp (
443 ACPI_OPERAND_OBJECT *ObjDesc,
444 ACPI_OPERAND_OBJECT *Target,
445 ACPI_WALK_STATE *WalkState)
446 {
447 ACPI_OPERAND_OBJECT *DdbHandle;
448 ACPI_TABLE_HEADER *TableHeader;
449 ACPI_TABLE_HEADER *Table;
450 UINT32 TableIndex;
451 ACPI_STATUS Status;
452 UINT32 Length;
453
454
455 ACPI_FUNCTION_TRACE (ExLoadOp);
456
457
458 /* Source Object can be either an OpRegion or a Buffer/Field */
459
460 switch (ObjDesc->Common.Type)
461 {
462 case ACPI_TYPE_REGION:
463
464 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
465 "Load table from Region %p\n", ObjDesc));
466
467 /* Region must be SystemMemory (from ACPI spec) */
468
469 if (ObjDesc->Region.SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY)
470 {
471 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
472 }
473
474 /*
475 * If the Region Address and Length have not been previously
476 * evaluated, evaluate them now and save the results.
477 */
478 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
479 {
480 Status = AcpiDsGetRegionArguments (ObjDesc);
481 if (ACPI_FAILURE (Status))
482 {
483 return_ACPI_STATUS (Status);
484 }
485 }
486
487 /* Get the table header first so we can get the table length */
488
489 TableHeader = ACPI_ALLOCATE (sizeof (ACPI_TABLE_HEADER));
490 if (!TableHeader)
491 {
492 return_ACPI_STATUS (AE_NO_MEMORY);
493 }
494
495 Status = AcpiExRegionRead (ObjDesc, sizeof (ACPI_TABLE_HEADER),
496 ACPI_CAST_PTR (UINT8, TableHeader));
497 Length = TableHeader->Length;
498 ACPI_FREE (TableHeader);
499
500 if (ACPI_FAILURE (Status))
501 {
502 return_ACPI_STATUS (Status);
503 }
504
505 /* Must have at least an ACPI table header */
506
507 if (Length < sizeof (ACPI_TABLE_HEADER))
508 {
509 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
510 }
511
512 /*
513 * The original implementation simply mapped the table, with no copy.
514 * However, the memory region is not guaranteed to remain stable and
515 * we must copy the table to a local buffer. For example, the memory
516 * region is corrupted after suspend on some machines. Dynamically
517 * loaded tables are usually small, so this overhead is minimal.
518 *
519 * The latest implementation (5/2009) does not use a mapping at all.
520 * We use the low-level operation region interface to read the table
521 * instead of the obvious optimization of using a direct mapping.
522 * This maintains a consistent use of operation regions across the
523 * entire subsystem. This is important if additional processing must
524 * be performed in the (possibly user-installed) operation region
525 * handler. For example, AcpiExec and ASLTS depend on this.
526 */
527
528 /* Allocate a buffer for the table */
529
530 Table = ACPI_ALLOCATE (Length);
531 if (!Table)
532 {
533 return_ACPI_STATUS (AE_NO_MEMORY);
534 }
535
536 /* Read the entire table */
537
538 Status = AcpiExRegionRead (ObjDesc, Length,
539 ACPI_CAST_PTR (UINT8, Table));
540 if (ACPI_FAILURE (Status))
541 {
542 ACPI_FREE (Table);
543 return_ACPI_STATUS (Status);
544 }
545 break;
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 TableHeader = ACPI_CAST_PTR (
562 ACPI_TABLE_HEADER, ObjDesc->Buffer.Pointer);
563 Length = TableHeader->Length;
564
565 /* Table cannot extend beyond the buffer */
566
567 if (Length > ObjDesc->Buffer.Length)
568 {
569 return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
570 }
571 if (Length < sizeof (ACPI_TABLE_HEADER))
572 {
573 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
574 }
575
576 /*
577 * Copy the table from the buffer because the buffer could be
578 * modified or even deleted in the future
579 */
580 Table = ACPI_ALLOCATE (Length);
581 if (!Table)
582 {
583 return_ACPI_STATUS (AE_NO_MEMORY);
584 }
585
586 memcpy (Table, TableHeader, Length);
587 break;
588
589 default:
590
591 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
592 }
593
594 /* Install the new table into the local data structures */
595
596 ACPI_INFO (("Dynamic OEM Table Load:"));
597 AcpiExExitInterpreter ();
598 Status = AcpiTbInstallAndLoadTable (ACPI_PTR_TO_PHYSADDR (Table),
599 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, Table, TRUE, &TableIndex);
600 AcpiExEnterInterpreter ();
601 if (ACPI_FAILURE (Status))
602 {
603 /* Delete allocated table buffer */
604
605 ACPI_FREE (Table);
606 return_ACPI_STATUS (Status);
607 }
608
609 /*
610 * Add the table to the namespace.
611 *
612 * Note: Load the table objects relative to the root of the namespace.
613 * This appears to go against the ACPI specification, but we do it for
614 * compatibility with other ACPI implementations.
615 */
616 Status = AcpiExAddTable (TableIndex, &DdbHandle);
617 if (ACPI_FAILURE (Status))
618 {
619 /* On error, TablePtr was deallocated above */
620
621 return_ACPI_STATUS (Status);
622 }
623
624 /* Complete the initialization/resolution of new objects */
625
626 AcpiExExitInterpreter ();
627 AcpiNsInitializeObjects ();
628 AcpiExEnterInterpreter ();
629
630 /* Store the DdbHandle into the Target operand */
631
632 Status = AcpiExStore (DdbHandle, Target, WalkState);
633 if (ACPI_FAILURE (Status))
634 {
635 (void) AcpiExUnloadTable (DdbHandle);
636
637 /* TablePtr was deallocated above */
638
639 AcpiUtRemoveReference (DdbHandle);
640 return_ACPI_STATUS (Status);
641 }
642
643 /* Remove the reference by added by AcpiExStore above */
644
645 AcpiUtRemoveReference (DdbHandle);
646 return_ACPI_STATUS (Status);
647 }
648
649
650 /*******************************************************************************
651 *
652 * FUNCTION: AcpiExUnloadTable
653 *
654 * PARAMETERS: DdbHandle - Handle to a previously loaded table
655 *
656 * RETURN: Status
657 *
658 * DESCRIPTION: Unload an ACPI table
659 *
660 ******************************************************************************/
661
662 ACPI_STATUS
AcpiExUnloadTable(ACPI_OPERAND_OBJECT * DdbHandle)663 AcpiExUnloadTable (
664 ACPI_OPERAND_OBJECT *DdbHandle)
665 {
666 ACPI_STATUS Status = AE_OK;
667 ACPI_OPERAND_OBJECT *TableDesc = DdbHandle;
668 UINT32 TableIndex;
669
670
671 ACPI_FUNCTION_TRACE (ExUnloadTable);
672
673
674 /*
675 * Temporarily emit a warning so that the ASL for the machine can be
676 * hopefully obtained. This is to say that the Unload() operator is
677 * extremely rare if not completely unused.
678 */
679 ACPI_WARNING ((AE_INFO,
680 "Received request to unload an ACPI table"));
681
682 /*
683 * May 2018: Unload is no longer supported for the following reasons:
684 * 1) A correct implementation on some hosts may not be possible.
685 * 2) Other ACPI implementations do not correctly/fully support it.
686 * 3) It requires host device driver support which does not exist.
687 * (To properly support namespace unload out from underneath.)
688 * 4) This AML operator has never been seen in the field.
689 */
690 ACPI_EXCEPTION ((AE_INFO, AE_NOT_IMPLEMENTED,
691 "AML Unload operator is not supported"));
692
693 /*
694 * Validate the handle
695 * Although the handle is partially validated in AcpiExReconfiguration()
696 * when it calls AcpiExResolveOperands(), the handle is more completely
697 * validated here.
698 *
699 * Handle must be a valid operand object of type reference. Also, the
700 * DdbHandle must still be marked valid (table has not been previously
701 * unloaded)
702 */
703 if ((!DdbHandle) ||
704 (ACPI_GET_DESCRIPTOR_TYPE (DdbHandle) != ACPI_DESC_TYPE_OPERAND) ||
705 (DdbHandle->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) ||
706 (!(DdbHandle->Common.Flags & AOPOBJ_DATA_VALID)))
707 {
708 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
709 }
710
711 /* Get the table index from the DdbHandle */
712
713 TableIndex = TableDesc->Reference.Value;
714
715 /*
716 * Release the interpreter lock so that the table lock won't have
717 * strict order requirement against it.
718 */
719 AcpiExExitInterpreter ();
720 Status = AcpiTbUnloadTable (TableIndex);
721 AcpiExEnterInterpreter ();
722
723 /*
724 * Invalidate the handle. We do this because the handle may be stored
725 * in a named object and may not be actually deleted until much later.
726 */
727 if (ACPI_SUCCESS (Status))
728 {
729 DdbHandle->Common.Flags &= ~AOPOBJ_DATA_VALID;
730 }
731 return_ACPI_STATUS (Status);
732 }
733