1 /******************************************************************************
2  *
3  * Module Name: excreate - Named object creation
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 "amlcode.h"
157 #include "acnamesp.h"
158 
159 
160 #define _COMPONENT          ACPI_EXECUTER
161         ACPI_MODULE_NAME    ("excreate")
162 
163 
164 /*******************************************************************************
165  *
166  * FUNCTION:    AcpiExCreateAlias
167  *
168  * PARAMETERS:  WalkState            - Current state, contains operands
169  *
170  * RETURN:      Status
171  *
172  * DESCRIPTION: Create a new named alias
173  *
174  ******************************************************************************/
175 
176 ACPI_STATUS
AcpiExCreateAlias(ACPI_WALK_STATE * WalkState)177 AcpiExCreateAlias (
178     ACPI_WALK_STATE         *WalkState)
179 {
180     ACPI_NAMESPACE_NODE     *TargetNode;
181     ACPI_NAMESPACE_NODE     *AliasNode;
182     ACPI_STATUS             Status = AE_OK;
183 
184 
185     ACPI_FUNCTION_TRACE (ExCreateAlias);
186 
187 
188     /* Get the source/alias operands (both namespace nodes) */
189 
190     AliasNode =  (ACPI_NAMESPACE_NODE *) WalkState->Operands[0];
191     TargetNode = (ACPI_NAMESPACE_NODE *) WalkState->Operands[1];
192 
193     if ((TargetNode->Type == ACPI_TYPE_LOCAL_ALIAS)  ||
194         (TargetNode->Type == ACPI_TYPE_LOCAL_METHOD_ALIAS))
195     {
196         /*
197          * Dereference an existing alias so that we don't create a chain
198          * of aliases. With this code, we guarantee that an alias is
199          * always exactly one level of indirection away from the
200          * actual aliased name.
201          */
202         TargetNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, TargetNode->Object);
203     }
204 
205     /* Ensure that the target node is valid */
206 
207     if (!TargetNode)
208     {
209         return_ACPI_STATUS (AE_NULL_OBJECT);
210     }
211 
212     /* Construct the alias object (a namespace node) */
213 
214     switch (TargetNode->Type)
215     {
216     case ACPI_TYPE_METHOD:
217         /*
218          * Control method aliases need to be differentiated with
219          * a special type
220          */
221         AliasNode->Type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
222         break;
223 
224     default:
225         /*
226          * All other object types.
227          *
228          * The new alias has the type ALIAS and points to the original
229          * NS node, not the object itself.
230          */
231         AliasNode->Type = ACPI_TYPE_LOCAL_ALIAS;
232         AliasNode->Object = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, TargetNode);
233         break;
234     }
235 
236     /* Since both operands are Nodes, we don't need to delete them */
237 
238     AliasNode->Object = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, TargetNode);
239     return_ACPI_STATUS (Status);
240 }
241 
242 
243 /*******************************************************************************
244  *
245  * FUNCTION:    AcpiExCreateEvent
246  *
247  * PARAMETERS:  WalkState           - Current state
248  *
249  * RETURN:      Status
250  *
251  * DESCRIPTION: Create a new event object
252  *
253  ******************************************************************************/
254 
255 ACPI_STATUS
AcpiExCreateEvent(ACPI_WALK_STATE * WalkState)256 AcpiExCreateEvent (
257     ACPI_WALK_STATE         *WalkState)
258 {
259     ACPI_STATUS             Status;
260     ACPI_OPERAND_OBJECT     *ObjDesc;
261 
262 
263     ACPI_FUNCTION_TRACE (ExCreateEvent);
264 
265 
266     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_EVENT);
267     if (!ObjDesc)
268     {
269         Status = AE_NO_MEMORY;
270         goto Cleanup;
271     }
272 
273     /*
274      * Create the actual OS semaphore, with zero initial units -- meaning
275      * that the event is created in an unsignalled state
276      */
277     Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0,
278         &ObjDesc->Event.OsSemaphore);
279     if (ACPI_FAILURE (Status))
280     {
281         goto Cleanup;
282     }
283 
284     /* Attach object to the Node */
285 
286     Status = AcpiNsAttachObject (
287         (ACPI_NAMESPACE_NODE *) WalkState->Operands[0],
288         ObjDesc, ACPI_TYPE_EVENT);
289 
290 Cleanup:
291     /*
292      * Remove local reference to the object (on error, will cause deletion
293      * of both object and semaphore if present.)
294      */
295     AcpiUtRemoveReference (ObjDesc);
296     return_ACPI_STATUS (Status);
297 }
298 
299 
300 /*******************************************************************************
301  *
302  * FUNCTION:    AcpiExCreateMutex
303  *
304  * PARAMETERS:  WalkState           - Current state
305  *
306  * RETURN:      Status
307  *
308  * DESCRIPTION: Create a new mutex object
309  *
310  *              Mutex (Name[0], SyncLevel[1])
311  *
312  ******************************************************************************/
313 
314 ACPI_STATUS
AcpiExCreateMutex(ACPI_WALK_STATE * WalkState)315 AcpiExCreateMutex (
316     ACPI_WALK_STATE         *WalkState)
317 {
318     ACPI_STATUS             Status = AE_OK;
319     ACPI_OPERAND_OBJECT     *ObjDesc;
320 
321 
322     ACPI_FUNCTION_TRACE_PTR (ExCreateMutex, ACPI_WALK_OPERANDS);
323 
324 
325     /* Create the new mutex object */
326 
327     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_MUTEX);
328     if (!ObjDesc)
329     {
330         Status = AE_NO_MEMORY;
331         goto Cleanup;
332     }
333 
334     /* Create the actual OS Mutex */
335 
336     Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex);
337     if (ACPI_FAILURE (Status))
338     {
339         goto Cleanup;
340     }
341 
342     /* Init object and attach to NS node */
343 
344     ObjDesc->Mutex.SyncLevel = (UINT8) WalkState->Operands[1]->Integer.Value;
345     ObjDesc->Mutex.Node = (ACPI_NAMESPACE_NODE *) WalkState->Operands[0];
346 
347     Status = AcpiNsAttachObject (
348         ObjDesc->Mutex.Node, ObjDesc, ACPI_TYPE_MUTEX);
349 
350 
351 Cleanup:
352     /*
353      * Remove local reference to the object (on error, will cause deletion
354      * of both object and semaphore if present.)
355      */
356     AcpiUtRemoveReference (ObjDesc);
357     return_ACPI_STATUS (Status);
358 }
359 
360 
361 /*******************************************************************************
362  *
363  * FUNCTION:    AcpiExCreateRegion
364  *
365  * PARAMETERS:  AmlStart            - Pointer to the region declaration AML
366  *              AmlLength           - Max length of the declaration AML
367  *              SpaceId             - Address space ID for the region
368  *              WalkState           - Current state
369  *
370  * RETURN:      Status
371  *
372  * DESCRIPTION: Create a new operation region object
373  *
374  ******************************************************************************/
375 
376 ACPI_STATUS
AcpiExCreateRegion(UINT8 * AmlStart,UINT32 AmlLength,UINT8 SpaceId,ACPI_WALK_STATE * WalkState)377 AcpiExCreateRegion (
378     UINT8                   *AmlStart,
379     UINT32                  AmlLength,
380     UINT8                   SpaceId,
381     ACPI_WALK_STATE         *WalkState)
382 {
383     ACPI_STATUS             Status;
384     ACPI_OPERAND_OBJECT     *ObjDesc;
385     ACPI_NAMESPACE_NODE     *Node;
386     ACPI_OPERAND_OBJECT     *RegionObj2;
387 
388 
389     ACPI_FUNCTION_TRACE (ExCreateRegion);
390 
391 
392     /* Get the Namespace Node */
393 
394     Node = WalkState->Op->Common.Node;
395 
396     /*
397      * If the region object is already attached to this node,
398      * just return
399      */
400     if (AcpiNsGetAttachedObject (Node))
401     {
402         return_ACPI_STATUS (AE_OK);
403     }
404 
405     /*
406      * Space ID must be one of the predefined IDs, or in the user-defined
407      * range
408      */
409     if (!AcpiIsValidSpaceId (SpaceId))
410     {
411         /*
412          * Print an error message, but continue. We don't want to abort
413          * a table load for this exception. Instead, if the region is
414          * actually used at runtime, abort the executing method.
415          */
416         ACPI_ERROR ((AE_INFO,
417             "Invalid/unknown Address Space ID: 0x%2.2X", SpaceId));
418     }
419 
420     ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "Region Type - %s (0x%X)\n",
421         AcpiUtGetRegionName (SpaceId), SpaceId));
422 
423     /* Create the region descriptor */
424 
425     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_REGION);
426     if (!ObjDesc)
427     {
428         Status = AE_NO_MEMORY;
429         goto Cleanup;
430     }
431 
432     /*
433      * Remember location in AML stream of address & length
434      * operands since they need to be evaluated at run time.
435      */
436     RegionObj2 = AcpiNsGetSecondaryObject (ObjDesc);
437     RegionObj2->Extra.AmlStart = AmlStart;
438     RegionObj2->Extra.AmlLength = AmlLength;
439     RegionObj2->Extra.Method_REG = NULL;
440     if (WalkState->ScopeInfo)
441     {
442         RegionObj2->Extra.ScopeNode = WalkState->ScopeInfo->Scope.Node;
443     }
444     else
445     {
446         RegionObj2->Extra.ScopeNode = Node;
447     }
448 
449     /* Init the region from the operands */
450 
451     ObjDesc->Region.SpaceId = SpaceId;
452     ObjDesc->Region.Address = 0;
453     ObjDesc->Region.Length = 0;
454     ObjDesc->Region.Pointer = NULL;
455     ObjDesc->Region.Node = Node;
456     ObjDesc->Region.Handler = NULL;
457     ObjDesc->Common.Flags &=
458         ~(AOPOBJ_SETUP_COMPLETE | AOPOBJ_REG_CONNECTED |
459           AOPOBJ_OBJECT_INITIALIZED);
460 
461     /* Install the new region object in the parent Node */
462 
463     Status = AcpiNsAttachObject (Node, ObjDesc, ACPI_TYPE_REGION);
464 
465 
466 Cleanup:
467 
468     /* Remove local reference to the object */
469 
470     AcpiUtRemoveReference (ObjDesc);
471     return_ACPI_STATUS (Status);
472 }
473 
474 
475 /*******************************************************************************
476  *
477  * FUNCTION:    AcpiExCreateProcessor
478  *
479  * PARAMETERS:  WalkState           - Current state
480  *
481  * RETURN:      Status
482  *
483  * DESCRIPTION: Create a new processor object and populate the fields
484  *
485  *              Processor (Name[0], CpuID[1], PblockAddr[2], PblockLength[3])
486  *
487  ******************************************************************************/
488 
489 ACPI_STATUS
AcpiExCreateProcessor(ACPI_WALK_STATE * WalkState)490 AcpiExCreateProcessor (
491     ACPI_WALK_STATE         *WalkState)
492 {
493     ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
494     ACPI_OPERAND_OBJECT     *ObjDesc;
495     ACPI_STATUS             Status;
496 
497 
498     ACPI_FUNCTION_TRACE_PTR (ExCreateProcessor, WalkState);
499 
500 
501     /* Create the processor object */
502 
503     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_PROCESSOR);
504     if (!ObjDesc)
505     {
506         return_ACPI_STATUS (AE_NO_MEMORY);
507     }
508 
509     /* Initialize the processor object from the operands */
510 
511     ObjDesc->Processor.ProcId = (UINT8) Operand[1]->Integer.Value;
512     ObjDesc->Processor.Length = (UINT8) Operand[3]->Integer.Value;
513     ObjDesc->Processor.Address = (ACPI_IO_ADDRESS) Operand[2]->Integer.Value;
514 
515     /* Install the processor object in the parent Node */
516 
517     Status = AcpiNsAttachObject ((ACPI_NAMESPACE_NODE *) Operand[0],
518         ObjDesc, ACPI_TYPE_PROCESSOR);
519 
520     /* Remove local reference to the object */
521 
522     AcpiUtRemoveReference (ObjDesc);
523     return_ACPI_STATUS (Status);
524 }
525 
526 
527 /*******************************************************************************
528  *
529  * FUNCTION:    AcpiExCreatePowerResource
530  *
531  * PARAMETERS:  WalkState           - Current state
532  *
533  * RETURN:      Status
534  *
535  * DESCRIPTION: Create a new PowerResource object and populate the fields
536  *
537  *              PowerResource (Name[0], SystemLevel[1], ResourceOrder[2])
538  *
539  ******************************************************************************/
540 
541 ACPI_STATUS
AcpiExCreatePowerResource(ACPI_WALK_STATE * WalkState)542 AcpiExCreatePowerResource (
543     ACPI_WALK_STATE         *WalkState)
544 {
545     ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
546     ACPI_STATUS             Status;
547     ACPI_OPERAND_OBJECT     *ObjDesc;
548 
549 
550     ACPI_FUNCTION_TRACE_PTR (ExCreatePowerResource, WalkState);
551 
552 
553     /* Create the power resource object */
554 
555     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_POWER);
556     if (!ObjDesc)
557     {
558         return_ACPI_STATUS (AE_NO_MEMORY);
559     }
560 
561     /* Initialize the power object from the operands */
562 
563     ObjDesc->PowerResource.SystemLevel = (UINT8) Operand[1]->Integer.Value;
564     ObjDesc->PowerResource.ResourceOrder = (UINT16) Operand[2]->Integer.Value;
565 
566     /* Install the  power resource object in the parent Node */
567 
568     Status = AcpiNsAttachObject ((ACPI_NAMESPACE_NODE *) Operand[0],
569         ObjDesc, ACPI_TYPE_POWER);
570 
571     /* Remove local reference to the object */
572 
573     AcpiUtRemoveReference (ObjDesc);
574     return_ACPI_STATUS (Status);
575 }
576 
577 
578 /*******************************************************************************
579  *
580  * FUNCTION:    AcpiExCreateMethod
581  *
582  * PARAMETERS:  AmlStart        - First byte of the method's AML
583  *              AmlLength       - AML byte count for this method
584  *              WalkState       - Current state
585  *
586  * RETURN:      Status
587  *
588  * DESCRIPTION: Create a new method object
589  *
590  ******************************************************************************/
591 
592 ACPI_STATUS
AcpiExCreateMethod(UINT8 * AmlStart,UINT32 AmlLength,ACPI_WALK_STATE * WalkState)593 AcpiExCreateMethod (
594     UINT8                   *AmlStart,
595     UINT32                  AmlLength,
596     ACPI_WALK_STATE         *WalkState)
597 {
598     ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
599     ACPI_OPERAND_OBJECT     *ObjDesc;
600     ACPI_STATUS             Status;
601     UINT8                   MethodFlags;
602 
603 
604     ACPI_FUNCTION_TRACE_PTR (ExCreateMethod, WalkState);
605 
606 
607     /* Create a new method object */
608 
609     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_METHOD);
610     if (!ObjDesc)
611     {
612        Status = AE_NO_MEMORY;
613        goto Exit;
614     }
615 
616     /* Save the method's AML pointer and length  */
617 
618     ObjDesc->Method.AmlStart = AmlStart;
619     ObjDesc->Method.AmlLength = AmlLength;
620     ObjDesc->Method.Node = Operand[0];
621 
622     /*
623      * Disassemble the method flags. Split off the ArgCount, Serialized
624      * flag, and SyncLevel for efficiency.
625      */
626     MethodFlags = (UINT8) Operand[1]->Integer.Value;
627     ObjDesc->Method.ParamCount = (UINT8)
628         (MethodFlags & AML_METHOD_ARG_COUNT);
629 
630     /*
631      * Get the SyncLevel. If method is serialized, a mutex will be
632      * created for this method when it is parsed.
633      */
634     if (MethodFlags & AML_METHOD_SERIALIZED)
635     {
636         ObjDesc->Method.InfoFlags = ACPI_METHOD_SERIALIZED;
637 
638         /*
639          * ACPI 1.0: SyncLevel = 0
640          * ACPI 2.0: SyncLevel = SyncLevel in method declaration
641          */
642         ObjDesc->Method.SyncLevel = (UINT8)
643             ((MethodFlags & AML_METHOD_SYNC_LEVEL) >> 4);
644     }
645 
646     /* Attach the new object to the method Node */
647 
648     Status = AcpiNsAttachObject ((ACPI_NAMESPACE_NODE *) Operand[0],
649         ObjDesc, ACPI_TYPE_METHOD);
650 
651     /* Remove local reference to the object */
652 
653     AcpiUtRemoveReference (ObjDesc);
654 
655 Exit:
656     /* Remove a reference to the operand */
657 
658     AcpiUtRemoveReference (Operand[1]);
659     return_ACPI_STATUS (Status);
660 }
661