1 /*******************************************************************************
2  *
3  * Module Name: nseval - Object evaluation, includes control method execution
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  *
67  * 3.3. Redistribution of Executable. Redistribution in executable form of any
68  * substantial portion of the Covered Code or modification must reproduce the
69  * above Copyright Notice, and the following Disclaimer and Export Compliance
70  * provision in the documentation and/or other materials provided with the
71  * distribution.
72  *
73  * 3.4. Intel retains all right, title, and interest in and to the Original
74  * Intel Code.
75  *
76  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
77  * Intel shall be used in advertising or otherwise to promote the sale, use or
78  * other dealings in products derived from or relating to the Covered Code
79  * without prior written authorization from Intel.
80  *
81  * 4. Disclaimer and Export Compliance
82  *
83  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
84  * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
85  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
86  * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
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 "acparser.h"
156 #include "acinterp.h"
157 #include "acnamesp.h"
158 
159 
160 #define _COMPONENT          ACPI_NAMESPACE
161         ACPI_MODULE_NAME    ("nseval")
162 
163 /* Local prototypes */
164 
165 static void
166 AcpiNsExecModuleCode (
167     ACPI_OPERAND_OBJECT     *MethodObj,
168     ACPI_EVALUATE_INFO      *Info);
169 
170 
171 /*******************************************************************************
172  *
173  * FUNCTION:    AcpiNsEvaluate
174  *
175  * PARAMETERS:  Info            - Evaluation info block, contains these fields
176  *                                and more:
177  *                  PrefixNode      - Prefix or Method/Object Node to execute
178  *                  RelativePath    - Name of method to execute, If NULL, the
179  *                                    Node is the object to execute
180  *                  Parameters      - List of parameters to pass to the method,
181  *                                    terminated by NULL. Params itself may be
182  *                                    NULL if no parameters are being passed.
183  *                  ParameterType   - Type of Parameter list
184  *                  ReturnObject    - Where to put method's return value (if
185  *                                    any). If NULL, no value is returned.
186  *                  Flags           - ACPI_IGNORE_RETURN_VALUE to delete return
187  *
188  * RETURN:      Status
189  *
190  * DESCRIPTION: Execute a control method or return the current value of an
191  *              ACPI namespace object.
192  *
193  * MUTEX:       Locks interpreter
194  *
195  ******************************************************************************/
196 
197 ACPI_STATUS
AcpiNsEvaluate(ACPI_EVALUATE_INFO * Info)198 AcpiNsEvaluate (
199     ACPI_EVALUATE_INFO      *Info)
200 {
201     ACPI_STATUS             Status;
202 
203 
204     ACPI_FUNCTION_TRACE (NsEvaluate);
205 
206 
207     if (!Info)
208     {
209         return_ACPI_STATUS (AE_BAD_PARAMETER);
210     }
211 
212     if (!Info->Node)
213     {
214         /*
215          * Get the actual namespace node for the target object if we
216          * need to. Handles these cases:
217          *
218          * 1) Null node, valid pathname from root (absolute path)
219          * 2) Node and valid pathname (path relative to Node)
220          * 3) Node, Null pathname
221          */
222         Status = AcpiNsGetNode (Info->PrefixNode, Info->RelativePathname,
223             ACPI_NS_NO_UPSEARCH, &Info->Node);
224         if (ACPI_FAILURE (Status))
225         {
226             return_ACPI_STATUS (Status);
227         }
228     }
229 
230     /*
231      * For a method alias, we must grab the actual method node so that
232      * proper scoping context will be established before execution.
233      */
234     if (AcpiNsGetType (Info->Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
235     {
236         Info->Node = ACPI_CAST_PTR (
237             ACPI_NAMESPACE_NODE, Info->Node->Object);
238     }
239 
240     /* Complete the info block initialization */
241 
242     Info->ReturnObject = NULL;
243     Info->NodeFlags = Info->Node->Flags;
244     Info->ObjDesc = AcpiNsGetAttachedObject (Info->Node);
245 
246     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
247         Info->RelativePathname, Info->Node,
248         AcpiNsGetAttachedObject (Info->Node)));
249 
250     /* Get info if we have a predefined name (_HID, etc.) */
251 
252     Info->Predefined = AcpiUtMatchPredefinedMethod (Info->Node->Name.Ascii);
253 
254     /* Get the full pathname to the object, for use in warning messages */
255 
256     Info->FullPathname = AcpiNsGetNormalizedPathname (Info->Node, TRUE);
257     if (!Info->FullPathname)
258     {
259         return_ACPI_STATUS (AE_NO_MEMORY);
260     }
261 
262     /* Count the number of arguments being passed in */
263 
264     Info->ParamCount = 0;
265     if (Info->Parameters)
266     {
267         while (Info->Parameters[Info->ParamCount])
268         {
269             Info->ParamCount++;
270         }
271 
272         /* Warn on impossible argument count */
273 
274         if (Info->ParamCount > ACPI_METHOD_NUM_ARGS)
275         {
276             ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, ACPI_WARN_ALWAYS,
277                 "Excess arguments (%u) - using only %u",
278                 Info->ParamCount, ACPI_METHOD_NUM_ARGS));
279 
280             Info->ParamCount = ACPI_METHOD_NUM_ARGS;
281         }
282     }
283 
284     /*
285      * For predefined names: Check that the declared argument count
286      * matches the ACPI spec -- otherwise this is a BIOS error.
287      */
288     AcpiNsCheckAcpiCompliance (Info->FullPathname, Info->Node,
289         Info->Predefined);
290 
291     /*
292      * For all names: Check that the incoming argument count for
293      * this method/object matches the actual ASL/AML definition.
294      */
295     AcpiNsCheckArgumentCount (Info->FullPathname, Info->Node,
296         Info->ParamCount, Info->Predefined);
297 
298     /* For predefined names: Typecheck all incoming arguments */
299 
300     AcpiNsCheckArgumentTypes (Info);
301 
302     /*
303      * Three major evaluation cases:
304      *
305      * 1) Object types that cannot be evaluated by definition
306      * 2) The object is a control method -- execute it
307      * 3) The object is not a method -- just return it's current value
308      */
309     switch (AcpiNsGetType (Info->Node))
310     {
311     case ACPI_TYPE_ANY:
312     case ACPI_TYPE_DEVICE:
313     case ACPI_TYPE_EVENT:
314     case ACPI_TYPE_MUTEX:
315     case ACPI_TYPE_REGION:
316     case ACPI_TYPE_THERMAL:
317     case ACPI_TYPE_LOCAL_SCOPE:
318         /*
319          * 1) Disallow evaluation of these object types. For these,
320          *    object evaluation is undefined.
321          */
322         ACPI_ERROR ((AE_INFO,
323             "%s: This object type [%s] "
324             "never contains data and cannot be evaluated",
325             Info->FullPathname, AcpiUtGetTypeName (Info->Node->Type)));
326 
327         Status = AE_TYPE;
328         goto Cleanup;
329 
330     case ACPI_TYPE_METHOD:
331         /*
332          * 2) Object is a control method - execute it
333          */
334 
335         /* Verify that there is a method object associated with this node */
336 
337         if (!Info->ObjDesc)
338         {
339             ACPI_ERROR ((AE_INFO, "%s: Method has no attached sub-object",
340                 Info->FullPathname));
341             Status = AE_NULL_OBJECT;
342             goto Cleanup;
343         }
344 
345         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
346             "**** Execute method [%s] at AML address %p length %X\n",
347             Info->FullPathname,
348             Info->ObjDesc->Method.AmlStart + 1,
349             Info->ObjDesc->Method.AmlLength - 1));
350 
351         /*
352          * Any namespace deletion must acquire both the namespace and
353          * interpreter locks to ensure that no thread is using the portion of
354          * the namespace that is being deleted.
355          *
356          * Execute the method via the interpreter. The interpreter is locked
357          * here before calling into the AML parser
358          */
359         AcpiExEnterInterpreter ();
360         Status = AcpiPsExecuteMethod (Info);
361         AcpiExExitInterpreter ();
362         break;
363 
364     default:
365         /*
366          * 3) All other non-method objects -- get the current object value
367          */
368 
369         /*
370          * Some objects require additional resolution steps (e.g., the Node
371          * may be a field that must be read, etc.) -- we can't just grab
372          * the object out of the node.
373          *
374          * Use ResolveNodeToValue() to get the associated value.
375          *
376          * NOTE: we can get away with passing in NULL for a walk state because
377          * the Node is guaranteed to not be a reference to either a method
378          * local or a method argument (because this interface is never called
379          * from a running method.)
380          *
381          * Even though we do not directly invoke the interpreter for object
382          * resolution, we must lock it because we could access an OpRegion.
383          * The OpRegion access code assumes that the interpreter is locked.
384          */
385         AcpiExEnterInterpreter ();
386 
387         /* TBD: ResolveNodeToValue has a strange interface, fix */
388 
389         Info->ReturnObject = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Info->Node);
390 
391         Status = AcpiExResolveNodeToValue (ACPI_CAST_INDIRECT_PTR (
392             ACPI_NAMESPACE_NODE, &Info->ReturnObject), NULL);
393         AcpiExExitInterpreter ();
394 
395         if (ACPI_FAILURE (Status))
396         {
397             Info->ReturnObject = NULL;
398             goto Cleanup;
399         }
400 
401         ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returned object %p [%s]\n",
402             Info->ReturnObject,
403             AcpiUtGetObjectTypeName (Info->ReturnObject)));
404 
405         Status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */
406         break;
407     }
408 
409     /*
410      * For predefined names, check the return value against the ACPI
411      * specification. Some incorrect return value types are repaired.
412      */
413     (void) AcpiNsCheckReturnValue (Info->Node, Info, Info->ParamCount,
414         Status, &Info->ReturnObject);
415 
416     /* Check if there is a return value that must be dealt with */
417 
418     if (Status == AE_CTRL_RETURN_VALUE)
419     {
420         /* If caller does not want the return value, delete it */
421 
422         if (Info->Flags & ACPI_IGNORE_RETURN_VALUE)
423         {
424             AcpiUtRemoveReference (Info->ReturnObject);
425             Info->ReturnObject = NULL;
426         }
427 
428         /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
429 
430         Status = AE_OK;
431     }
432     else if (ACPI_FAILURE(Status))
433     {
434         /* If ReturnObject exists, delete it */
435 
436         if (Info->ReturnObject)
437         {
438             AcpiUtRemoveReference (Info->ReturnObject);
439             Info->ReturnObject = NULL;
440         }
441     }
442 
443     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
444         "*** Completed evaluation of object %s ***\n",
445         Info->RelativePathname));
446 
447 Cleanup:
448     /*
449      * Namespace was unlocked by the handling AcpiNs* function, so we
450      * just free the pathname and return
451      */
452     ACPI_FREE (Info->FullPathname);
453     Info->FullPathname = NULL;
454     return_ACPI_STATUS (Status);
455 }
456 
457 
458 /*******************************************************************************
459  *
460  * FUNCTION:    AcpiNsExecModuleCodeList
461  *
462  * PARAMETERS:  None
463  *
464  * RETURN:      None. Exceptions during method execution are ignored, since
465  *              we cannot abort a table load.
466  *
467  * DESCRIPTION: Execute all elements of the global module-level code list.
468  *              Each element is executed as a single control method.
469  *
470  * NOTE: With this option enabled, each block of detected executable AML
471  * code that is outside of any control method is wrapped with a temporary
472  * control method object and placed on a global list. The methods on this
473  * list are executed below.
474  *
475  * This function executes the module-level code for all tables only after
476  * all of the tables have been loaded. It is a legacy option and is
477  * not compatible with other ACPI implementations. See AcpiNsLoadTable.
478  *
479  * This function will be removed when the legacy option is removed.
480  *
481  ******************************************************************************/
482 
483 void
AcpiNsExecModuleCodeList(void)484 AcpiNsExecModuleCodeList (
485     void)
486 {
487     ACPI_OPERAND_OBJECT     *Prev;
488     ACPI_OPERAND_OBJECT     *Next;
489     ACPI_EVALUATE_INFO      *Info;
490     UINT32                  MethodCount = 0;
491 
492 
493     ACPI_FUNCTION_TRACE (NsExecModuleCodeList);
494 
495 
496     /* Exit now if the list is empty */
497 
498     Next = AcpiGbl_ModuleCodeList;
499     if (!Next)
500     {
501         ACPI_DEBUG_PRINT ((ACPI_DB_INIT_NAMES,
502             "Legacy MLC block list is empty\n"));
503 
504         return_VOID;
505     }
506 
507     /* Allocate the evaluation information block */
508 
509     Info = ACPI_ALLOCATE (sizeof (ACPI_EVALUATE_INFO));
510     if (!Info)
511     {
512         return_VOID;
513     }
514 
515     /* Walk the list, executing each "method" */
516 
517     while (Next)
518     {
519         Prev = Next;
520         Next = Next->Method.Mutex;
521 
522         /* Clear the link field and execute the method */
523 
524         Prev->Method.Mutex = NULL;
525         AcpiNsExecModuleCode (Prev, Info);
526         MethodCount++;
527 
528         /* Delete the (temporary) method object */
529 
530         AcpiUtRemoveReference (Prev);
531     }
532 
533     ACPI_INFO ((
534         "Executed %u blocks of module-level executable AML code",
535         MethodCount));
536 
537     ACPI_FREE (Info);
538     AcpiGbl_ModuleCodeList = NULL;
539     return_VOID;
540 }
541 
542 
543 /*******************************************************************************
544  *
545  * FUNCTION:    AcpiNsExecModuleCode
546  *
547  * PARAMETERS:  MethodObj           - Object container for the module-level code
548  *              Info                - Info block for method evaluation
549  *
550  * RETURN:      None. Exceptions during method execution are ignored, since
551  *              we cannot abort a table load.
552  *
553  * DESCRIPTION: Execute a control method containing a block of module-level
554  *              executable AML code. The control method is temporarily
555  *              installed to the root node, then evaluated.
556  *
557  ******************************************************************************/
558 
559 static void
AcpiNsExecModuleCode(ACPI_OPERAND_OBJECT * MethodObj,ACPI_EVALUATE_INFO * Info)560 AcpiNsExecModuleCode (
561     ACPI_OPERAND_OBJECT     *MethodObj,
562     ACPI_EVALUATE_INFO      *Info)
563 {
564     ACPI_OPERAND_OBJECT     *ParentObj;
565     ACPI_NAMESPACE_NODE     *ParentNode;
566     ACPI_OBJECT_TYPE        Type;
567     ACPI_STATUS             Status;
568 
569 
570     ACPI_FUNCTION_TRACE (NsExecModuleCode);
571 
572 
573     /*
574      * Get the parent node. We cheat by using the NextObject field
575      * of the method object descriptor.
576      */
577     ParentNode = ACPI_CAST_PTR (
578         ACPI_NAMESPACE_NODE, MethodObj->Method.NextObject);
579     Type = AcpiNsGetType (ParentNode);
580 
581     /*
582      * Get the region handler and save it in the method object. We may need
583      * this if an operation region declaration causes a _REG method to be run.
584      *
585      * We can't do this in AcpiPsLinkModuleCode because
586      * AcpiGbl_RootNode->Object is NULL at PASS1.
587      */
588     if ((Type == ACPI_TYPE_DEVICE) && ParentNode->Object)
589     {
590         MethodObj->Method.Dispatch.Handler =
591             ParentNode->Object->Device.Handler;
592     }
593 
594     /* Must clear NextObject (AcpiNsAttachObject needs the field) */
595 
596     MethodObj->Method.NextObject = NULL;
597 
598     /* Initialize the evaluation information block */
599 
600     memset (Info, 0, sizeof (ACPI_EVALUATE_INFO));
601     Info->PrefixNode = ParentNode;
602 
603     /*
604      * Get the currently attached parent object. Add a reference,
605      * because the ref count will be decreased when the method object
606      * is installed to the parent node.
607      */
608     ParentObj = AcpiNsGetAttachedObject (ParentNode);
609     if (ParentObj)
610     {
611         AcpiUtAddReference (ParentObj);
612     }
613 
614     /* Install the method (module-level code) in the parent node */
615 
616     Status = AcpiNsAttachObject (ParentNode, MethodObj, ACPI_TYPE_METHOD);
617     if (ACPI_FAILURE (Status))
618     {
619         goto Exit;
620     }
621 
622     /* Execute the parent node as a control method */
623 
624     Status = AcpiNsEvaluate (Info);
625 
626     ACPI_DEBUG_PRINT ((ACPI_DB_INIT_NAMES,
627         "Executed module-level code at %p\n",
628         MethodObj->Method.AmlStart));
629 
630     /* Delete a possible implicit return value (in slack mode) */
631 
632     if (Info->ReturnObject)
633     {
634         AcpiUtRemoveReference (Info->ReturnObject);
635     }
636 
637     /* Detach the temporary method object */
638 
639     AcpiNsDetachObject (ParentNode);
640 
641     /* Restore the original parent object */
642 
643     if (ParentObj)
644     {
645         Status = AcpiNsAttachObject (ParentNode, ParentObj, Type);
646     }
647     else
648     {
649         ParentNode->Type = (UINT8) Type;
650     }
651 
652 Exit:
653     if (ParentObj)
654     {
655         AcpiUtRemoveReference (ParentObj);
656     }
657     return_VOID;
658 }
659