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 - 2023, 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
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 *ReturnObj;
248 ACPI_OPERAND_OBJECT *DdbHandle;
249 UINT32 TableIndex;
250
251
252 ACPI_FUNCTION_TRACE (ExLoadTableOp);
253
254
255 /* Create the return object */
256
257 ReturnObj = AcpiUtCreateIntegerObject ((UINT64) 0);
258 if (!ReturnObj)
259 {
260 return_ACPI_STATUS (AE_NO_MEMORY);
261 }
262
263 *ReturnDesc = ReturnObj;
264
265 /* Find the ACPI table in the RSDT/XSDT */
266
267 AcpiExExitInterpreter ();
268 Status = AcpiTbFindTable (
269 Operand[0]->String.Pointer,
270 Operand[1]->String.Pointer,
271 Operand[2]->String.Pointer, &TableIndex);
272 AcpiExEnterInterpreter ();
273 if (ACPI_FAILURE (Status))
274 {
275 if (Status != AE_NOT_FOUND)
276 {
277 return_ACPI_STATUS (Status);
278 }
279
280 /* Table not found, return an Integer=0 and AE_OK */
281
282 return_ACPI_STATUS (AE_OK);
283 }
284
285 /* Default nodes */
286
287 StartNode = WalkState->ScopeInfo->Scope.Node;
288 ParentNode = AcpiGbl_RootNode;
289
290 /* RootPath (optional parameter) */
291
292 if (Operand[3]->String.Length > 0)
293 {
294 /*
295 * Find the node referenced by the RootPathString. This is the
296 * location within the namespace where the table will be loaded.
297 */
298 Status = AcpiNsGetNodeUnlocked (StartNode,
299 Operand[3]->String.Pointer, ACPI_NS_SEARCH_PARENT,
300 &ParentNode);
301 if (ACPI_FAILURE (Status))
302 {
303 return_ACPI_STATUS (Status);
304 }
305 }
306
307 /* ParameterPath (optional parameter) */
308
309 if (Operand[4]->String.Length > 0)
310 {
311 if ((Operand[4]->String.Pointer[0] != AML_ROOT_PREFIX) &&
312 (Operand[4]->String.Pointer[0] != AML_PARENT_PREFIX))
313 {
314 /*
315 * Path is not absolute, so it will be relative to the node
316 * referenced by the RootPathString (or the NS root if omitted)
317 */
318 StartNode = ParentNode;
319 }
320
321 /* Find the node referenced by the ParameterPathString */
322
323 Status = AcpiNsGetNodeUnlocked (StartNode,
324 Operand[4]->String.Pointer, ACPI_NS_SEARCH_PARENT,
325 &ParameterNode);
326 if (ACPI_FAILURE (Status))
327 {
328 return_ACPI_STATUS (Status);
329 }
330 }
331
332 /* Load the table into the namespace */
333
334 ACPI_INFO (("Dynamic OEM Table Load:"));
335 AcpiExExitInterpreter ();
336 Status = AcpiTbLoadTable (TableIndex, ParentNode);
337 AcpiExEnterInterpreter ();
338 if (ACPI_FAILURE (Status))
339 {
340 return_ACPI_STATUS (Status);
341 }
342
343 Status = AcpiExAddTable (TableIndex, &DdbHandle);
344 if (ACPI_FAILURE (Status))
345 {
346 return_ACPI_STATUS (Status);
347 }
348
349 /* Complete the initialization/resolution of new objects */
350
351 AcpiExExitInterpreter();
352 AcpiNsInitializeObjects();
353 AcpiExEnterInterpreter();
354
355 /* Parameter Data (optional) */
356
357 if (ParameterNode)
358 {
359 /* Store the parameter data into the optional parameter object */
360
361 Status = AcpiExStore (Operand[5],
362 ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParameterNode), WalkState);
363 if (ACPI_FAILURE (Status))
364 {
365 (void) AcpiExUnloadTable (DdbHandle);
366
367 AcpiUtRemoveReference (DdbHandle);
368 return_ACPI_STATUS (Status);
369 }
370 }
371
372 /* Remove the reference to DdbHandle created by AcpiExAddTable above */
373
374 AcpiUtRemoveReference (DdbHandle);
375
376 /* Return -1 (non-zero) indicates success */
377
378 ReturnObj->Integer.Value = 0xFFFFFFFFFFFFFFFF;
379 return_ACPI_STATUS (Status);
380 }
381
382
383 /*******************************************************************************
384 *
385 * FUNCTION: AcpiExRegionRead
386 *
387 * PARAMETERS: ObjDesc - Region descriptor
388 * Length - Number of bytes to read
389 * Buffer - Pointer to where to put the data
390 *
391 * RETURN: Status
392 *
393 * DESCRIPTION: Read data from an operation region. The read starts from the
394 * beginning of the region.
395 *
396 ******************************************************************************/
397
398 static ACPI_STATUS
AcpiExRegionRead(ACPI_OPERAND_OBJECT * ObjDesc,UINT32 Length,UINT8 * Buffer)399 AcpiExRegionRead (
400 ACPI_OPERAND_OBJECT *ObjDesc,
401 UINT32 Length,
402 UINT8 *Buffer)
403 {
404 ACPI_STATUS Status;
405 UINT64 Value;
406 UINT32 RegionOffset = 0;
407 UINT32 i;
408
409
410 /* Bytewise reads */
411
412 for (i = 0; i < Length; i++)
413 {
414 Status = AcpiEvAddressSpaceDispatch (ObjDesc, NULL, ACPI_READ,
415 RegionOffset, 8, &Value);
416 if (ACPI_FAILURE (Status))
417 {
418 return (Status);
419 }
420
421 *Buffer = (UINT8) Value;
422 Buffer++;
423 RegionOffset++;
424 }
425
426 return (AE_OK);
427 }
428
429
430 /*******************************************************************************
431 *
432 * FUNCTION: AcpiExLoadOp
433 *
434 * PARAMETERS: ObjDesc - Region or Buffer/Field where the table will be
435 * obtained
436 * Target - Where the status of the load will be stored
437 * WalkState - Current state
438 *
439 * RETURN: Status
440 *
441 * DESCRIPTION: Load an ACPI table from a field or operation region
442 *
443 * NOTE: Region Fields (Field, BankField, IndexFields) are resolved to buffer
444 * objects before this code is reached.
445 *
446 * If source is an operation region, it must refer to SystemMemory, as
447 * per the ACPI specification.
448 *
449 ******************************************************************************/
450
451 ACPI_STATUS
AcpiExLoadOp(ACPI_OPERAND_OBJECT * ObjDesc,ACPI_OPERAND_OBJECT * Target,ACPI_WALK_STATE * WalkState)452 AcpiExLoadOp (
453 ACPI_OPERAND_OBJECT *ObjDesc,
454 ACPI_OPERAND_OBJECT *Target,
455 ACPI_WALK_STATE *WalkState)
456 {
457 ACPI_OPERAND_OBJECT *DdbHandle;
458 ACPI_TABLE_HEADER *TableHeader;
459 ACPI_TABLE_HEADER *Table;
460 UINT32 TableIndex;
461 ACPI_STATUS Status;
462 UINT32 Length;
463
464
465 ACPI_FUNCTION_TRACE (ExLoadOp);
466
467
468 if (Target->Common.DescriptorType == ACPI_DESC_TYPE_NAMED)
469 {
470 Target = AcpiNsGetAttachedObject (ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Target));
471 }
472 if (Target->Common.Type != ACPI_TYPE_INTEGER)
473 {
474 ACPI_ERROR ((AE_INFO, "Type not integer: %X", Target->Common.Type));
475 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
476 }
477
478 Target->Integer.Value = 0;
479
480 /* Source Object can be either an OpRegion or a Buffer/Field */
481
482 switch (ObjDesc->Common.Type)
483 {
484 case ACPI_TYPE_REGION:
485
486 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
487 "Load table from Region %p\n", ObjDesc));
488
489 /* Region must be SystemMemory (from ACPI spec) */
490
491 if (ObjDesc->Region.SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY)
492 {
493 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
494 }
495
496 /*
497 * If the Region Address and Length have not been previously
498 * evaluated, evaluate them now and save the results.
499 */
500 if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
501 {
502 Status = AcpiDsGetRegionArguments (ObjDesc);
503 if (ACPI_FAILURE (Status))
504 {
505 return_ACPI_STATUS (Status);
506 }
507 }
508
509 /* Get the table header first so we can get the table length */
510
511 TableHeader = ACPI_ALLOCATE (sizeof (ACPI_TABLE_HEADER));
512 if (!TableHeader)
513 {
514 return_ACPI_STATUS (AE_NO_MEMORY);
515 }
516
517 Status = AcpiExRegionRead (ObjDesc, sizeof (ACPI_TABLE_HEADER),
518 ACPI_CAST_PTR (UINT8, TableHeader));
519 Length = TableHeader->Length;
520 ACPI_FREE (TableHeader);
521
522 if (ACPI_FAILURE (Status))
523 {
524 return_ACPI_STATUS (Status);
525 }
526
527 /* Must have at least an ACPI table header */
528
529 if (Length < sizeof (ACPI_TABLE_HEADER))
530 {
531 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
532 }
533
534 /*
535 * The original implementation simply mapped the table, with no copy.
536 * However, the memory region is not guaranteed to remain stable and
537 * we must copy the table to a local buffer. For example, the memory
538 * region is corrupted after suspend on some machines. Dynamically
539 * loaded tables are usually small, so this overhead is minimal.
540 *
541 * The latest implementation (5/2009) does not use a mapping at all.
542 * We use the low-level operation region interface to read the table
543 * instead of the obvious optimization of using a direct mapping.
544 * This maintains a consistent use of operation regions across the
545 * entire subsystem. This is important if additional processing must
546 * be performed in the (possibly user-installed) operation region
547 * handler. For example, AcpiExec and ASLTS depend on this.
548 */
549
550 /* Allocate a buffer for the table */
551
552 Table = ACPI_ALLOCATE (Length);
553 if (!Table)
554 {
555 return_ACPI_STATUS (AE_NO_MEMORY);
556 }
557
558 /* Read the entire table */
559
560 Status = AcpiExRegionRead (ObjDesc, Length,
561 ACPI_CAST_PTR (UINT8, Table));
562 if (ACPI_FAILURE (Status))
563 {
564 ACPI_FREE (Table);
565 return_ACPI_STATUS (Status);
566 }
567 break;
568
569 case ACPI_TYPE_BUFFER: /* Buffer or resolved RegionField */
570
571 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
572 "Load table from Buffer or Field %p\n", ObjDesc));
573
574 /* Must have at least an ACPI table header */
575
576 if (ObjDesc->Buffer.Length < sizeof (ACPI_TABLE_HEADER))
577 {
578 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
579 }
580
581 /* Get the actual table length from the table header */
582
583 TableHeader = ACPI_CAST_PTR (
584 ACPI_TABLE_HEADER, ObjDesc->Buffer.Pointer);
585 Length = TableHeader->Length;
586
587 /* Table cannot extend beyond the buffer */
588
589 if (Length > ObjDesc->Buffer.Length)
590 {
591 return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
592 }
593 if (Length < sizeof (ACPI_TABLE_HEADER))
594 {
595 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
596 }
597
598 /*
599 * Copy the table from the buffer because the buffer could be
600 * modified or even deleted in the future
601 */
602 Table = ACPI_ALLOCATE (Length);
603 if (!Table)
604 {
605 return_ACPI_STATUS (AE_NO_MEMORY);
606 }
607
608 memcpy (Table, TableHeader, Length);
609 break;
610
611 default:
612
613 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
614 }
615
616 /* Install the new table into the local data structures */
617
618 ACPI_INFO (("Dynamic OEM Table Load:"));
619 AcpiExExitInterpreter ();
620 Status = AcpiTbInstallAndLoadTable (ACPI_PTR_TO_PHYSADDR (Table),
621 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, Table, TRUE, &TableIndex);
622 AcpiExEnterInterpreter ();
623 if (ACPI_FAILURE (Status))
624 {
625 /* Delete allocated table buffer */
626
627 ACPI_FREE (Table);
628 return_ACPI_STATUS (Status);
629 }
630
631 /*
632 * Add the table to the namespace.
633 *
634 * Note: Load the table objects relative to the root of the namespace.
635 * This appears to go against the ACPI specification, but we do it for
636 * compatibility with other ACPI implementations.
637 */
638 Status = AcpiExAddTable (TableIndex, &DdbHandle);
639 if (ACPI_FAILURE (Status))
640 {
641 return_ACPI_STATUS (Status);
642 }
643
644 /* Complete the initialization/resolution of new objects */
645
646 AcpiExExitInterpreter ();
647 AcpiNsInitializeObjects ();
648 AcpiExEnterInterpreter ();
649
650 /* Remove the reference to DdbHandle created by AcpiExAddTable above */
651
652 AcpiUtRemoveReference (DdbHandle);
653
654 /* Return -1 (non-zero) indicates success */
655
656 Target->Integer.Value = 0xFFFFFFFFFFFFFFFF;
657 return_ACPI_STATUS (Status);
658 }
659
660
661 /*******************************************************************************
662 *
663 * FUNCTION: AcpiExUnloadTable
664 *
665 * PARAMETERS: DdbHandle - Handle to a previously loaded table
666 *
667 * RETURN: Status
668 *
669 * DESCRIPTION: Unload an ACPI table
670 *
671 ******************************************************************************/
672
673 ACPI_STATUS
AcpiExUnloadTable(ACPI_OPERAND_OBJECT * DdbHandle)674 AcpiExUnloadTable (
675 ACPI_OPERAND_OBJECT *DdbHandle)
676 {
677 ACPI_STATUS Status = AE_OK;
678 ACPI_OPERAND_OBJECT *TableDesc = DdbHandle;
679 UINT32 TableIndex;
680
681
682 ACPI_FUNCTION_TRACE (ExUnloadTable);
683
684
685 /*
686 * Temporarily emit a warning so that the ASL for the machine can be
687 * hopefully obtained. This is to say that the Unload() operator is
688 * extremely rare if not completely unused.
689 */
690 ACPI_WARNING ((AE_INFO,
691 "Received request to unload an ACPI table"));
692
693 /*
694 * May 2018: Unload is no longer supported for the following reasons:
695 * 1) A correct implementation on some hosts may not be possible.
696 * 2) Other ACPI implementations do not correctly/fully support it.
697 * 3) It requires host device driver support which does not exist.
698 * (To properly support namespace unload out from underneath.)
699 * 4) This AML operator has never been seen in the field.
700 */
701 ACPI_EXCEPTION ((AE_INFO, AE_NOT_IMPLEMENTED,
702 "AML Unload operator is not supported"));
703
704 /*
705 * Validate the handle
706 * Although the handle is partially validated in AcpiExReconfiguration()
707 * when it calls AcpiExResolveOperands(), the handle is more completely
708 * validated here.
709 *
710 * Handle must be a valid operand object of type reference. Also, the
711 * DdbHandle must still be marked valid (table has not been previously
712 * unloaded)
713 */
714 if ((!DdbHandle) ||
715 (ACPI_GET_DESCRIPTOR_TYPE (DdbHandle) != ACPI_DESC_TYPE_OPERAND) ||
716 (DdbHandle->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) ||
717 (!(DdbHandle->Common.Flags & AOPOBJ_DATA_VALID)))
718 {
719 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
720 }
721
722 /* Get the table index from the DdbHandle */
723
724 TableIndex = TableDesc->Reference.Value;
725
726 /*
727 * Release the interpreter lock so that the table lock won't have
728 * strict order requirement against it.
729 */
730 AcpiExExitInterpreter ();
731 Status = AcpiTbUnloadTable (TableIndex);
732 AcpiExEnterInterpreter ();
733
734 /*
735 * Invalidate the handle. We do this because the handle may be stored
736 * in a named object and may not be actually deleted until much later.
737 */
738 if (ACPI_SUCCESS (Status))
739 {
740 DdbHandle->Common.Flags &= ~AOPOBJ_DATA_VALID;
741 }
742 return_ACPI_STATUS (Status);
743 }
744