xref: /illumos-gate/usr/src/common/acpica/executer/excreate.c (revision 35786f6866ae52207d0f1a25fe7ca5f652f32ce0)
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 - 2018, Intel Corp.
12  * All rights reserved.
13  *
14  * 2. License
15  *
16  * 2.1. This is your license from Intel Corp. under its intellectual property
17  * rights. You may have additional license terms from the party that provided
18  * you this software, covering your right to use that party's intellectual
19  * property rights.
20  *
21  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22  * copy of the source code appearing in this file ("Covered Code") an
23  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24  * base code distributed originally by Intel ("Original Intel Code") to copy,
25  * make derivatives, distribute, use and display any portion of the Covered
26  * Code in any form, with the right to sublicense such rights; and
27  *
28  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29  * license (with the right to sublicense), under only those claims of Intel
30  * patents that are infringed by the Original Intel Code, to make, use, sell,
31  * offer to sell, and import the Covered Code and derivative works thereof
32  * solely to the minimum extent necessary to exercise the above copyright
33  * license, and in no event shall the patent license extend to any additions
34  * to or modifications of the Original Intel Code. No other license or right
35  * is granted directly or by implication, estoppel or otherwise;
36  *
37  * The above copyright and patent license is granted only if the following
38  * conditions are met:
39  *
40  * 3. Conditions
41  *
42  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43  * Redistribution of source code of any substantial portion of the Covered
44  * Code or modification with rights to further distribute source must include
45  * the above Copyright Notice, the above License, this list of Conditions,
46  * and the following Disclaimer and Export Compliance provision. In addition,
47  * Licensee must cause all Covered Code to which Licensee contributes to
48  * contain a file documenting the changes Licensee made to create that Covered
49  * Code and the date of any change. Licensee must include in that file the
50  * documentation of any changes made by any predecessor Licensee. Licensee
51  * must include a prominent statement that the modification is derived,
52  * directly or indirectly, from Original Intel Code.
53  *
54  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55  * Redistribution of source code of any substantial portion of the Covered
56  * Code or modification without rights to further distribute source must
57  * include the following Disclaimer and Export Compliance provision in the
58  * documentation and/or other materials provided with distribution. In
59  * addition, Licensee may not authorize further sublicense of source of any
60  * portion of the Covered Code, and must include terms to the effect that the
61  * license from Licensee to its licensee is limited to the intellectual
62  * property embodied in the software Licensee provides to its licensee, and
63  * not to intellectual property embodied in modifications its licensee may
64  * make.
65  *
66  * 3.3. Redistribution of Executable. Redistribution in executable form of any
67  * substantial portion of the Covered Code or modification must reproduce the
68  * above Copyright Notice, and the following Disclaimer and Export Compliance
69  * provision in the documentation and/or other materials provided with the
70  * distribution.
71  *
72  * 3.4. Intel retains all right, title, and interest in and to the Original
73  * Intel Code.
74  *
75  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76  * Intel shall be used in advertising or otherwise to promote the sale, use or
77  * other dealings in products derived from or relating to the Covered Code
78  * without prior written authorization from Intel.
79  *
80  * 4. Disclaimer and Export Compliance
81  *
82  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83  * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85  * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 
87  * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
88  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
89  * PARTICULAR PURPOSE.
90  *
91  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
92  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
93  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
94  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
95  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
96  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
97  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
98  * LIMITED REMEDY.
99  *
100  * 4.3. Licensee shall not export, either directly or indirectly, any of this
101  * software or system incorporating such software without first obtaining any
102  * required license or other approval from the U. S. Department of Commerce or
103  * any other agency or department of the United States Government. In the
104  * event Licensee exports any such software from the United States or
105  * re-exports any such software from a foreign destination, Licensee shall
106  * ensure that the distribution and export/re-export of the software is in
107  * compliance with all laws, regulations, orders, or other restrictions of the
108  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
109  * any of its subsidiaries will export/re-export any technical data, process,
110  * software, or service, directly or indirectly, to any country for which the
111  * United States government or any agency thereof requires an export license,
112  * other governmental approval, or letter of assurance, without first obtaining
113  * such license, approval or letter.
114  *
115  *****************************************************************************
116  *
117  * Alternatively, you may choose to be licensed under the terms of the
118  * following license:
119  *
120  * Redistribution and use in source and binary forms, with or without
121  * modification, are permitted provided that the following conditions
122  * are met:
123  * 1. Redistributions of source code must retain the above copyright
124  *    notice, this list of conditions, and the following disclaimer,
125  *    without modification.
126  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
127  *    substantially similar to the "NO WARRANTY" disclaimer below
128  *    ("Disclaimer") and any redistribution must be conditioned upon
129  *    including a substantially similar Disclaimer requirement for further
130  *    binary redistribution.
131  * 3. Neither the names of the above-listed copyright holders nor the names
132  *    of any contributors may be used to endorse or promote products derived
133  *    from this software without specific prior written permission.
134  *
135  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
136  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
137  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
138  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
139  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
140  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
141  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
142  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
143  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
144  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
145  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
146  *
147  * Alternatively, you may choose to be licensed under the terms of the
148  * GNU General Public License ("GPL") version 2 as published by the Free
149  * Software Foundation.
150  *
151  *****************************************************************************/
152 
153 #include "acpi.h"
154 #include "accommon.h"
155 #include "acinterp.h"
156 #include "amlcode.h"
157 #include "acnamesp.h"
158 
159 
160 #define _COMPONENT          ACPI_EXECUTER
161         ACPI_MODULE_NAME    ("excreate")
162 
163 
164 #ifndef ACPI_NO_METHOD_EXECUTION
165 /*******************************************************************************
166  *
167  * FUNCTION:    AcpiExCreateAlias
168  *
169  * PARAMETERS:  WalkState            - Current state, contains operands
170  *
171  * RETURN:      Status
172  *
173  * DESCRIPTION: Create a new named alias
174  *
175  ******************************************************************************/
176 
177 ACPI_STATUS
AcpiExCreateAlias(ACPI_WALK_STATE * WalkState)178 AcpiExCreateAlias (
179     ACPI_WALK_STATE         *WalkState)
180 {
181     ACPI_NAMESPACE_NODE     *TargetNode;
182     ACPI_NAMESPACE_NODE     *AliasNode;
183     ACPI_STATUS             Status = AE_OK;
184 
185 
186     ACPI_FUNCTION_TRACE (ExCreateAlias);
187 
188 
189     /* Get the source/alias operands (both namespace nodes) */
190 
191     AliasNode =  (ACPI_NAMESPACE_NODE *) WalkState->Operands[0];
192     TargetNode = (ACPI_NAMESPACE_NODE *) WalkState->Operands[1];
193 
194     if ((TargetNode->Type == ACPI_TYPE_LOCAL_ALIAS)  ||
195         (TargetNode->Type == ACPI_TYPE_LOCAL_METHOD_ALIAS))
196     {
197         /*
198          * Dereference an existing alias so that we don't create a chain
199          * of aliases. With this code, we guarantee that an alias is
200          * always exactly one level of indirection away from the
201          * actual aliased name.
202          */
203         TargetNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, TargetNode->Object);
204     }
205 
206     /* Ensure that the target node is valid */
207 
208     if (!TargetNode)
209     {
210         return_ACPI_STATUS (AE_NULL_OBJECT);
211     }
212 
213     /* Construct the alias object (a namespace node) */
214 
215     switch (TargetNode->Type)
216     {
217     case ACPI_TYPE_METHOD:
218         /*
219          * Control method aliases need to be differentiated with
220          * a special type
221          */
222         AliasNode->Type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
223         break;
224 
225     default:
226         /*
227          * All other object types.
228          *
229          * The new alias has the type ALIAS and points to the original
230          * NS node, not the object itself.
231          */
232         AliasNode->Type = ACPI_TYPE_LOCAL_ALIAS;
233         AliasNode->Object = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, TargetNode);
234         break;
235     }
236 
237     /* Since both operands are Nodes, we don't need to delete them */
238 
239     AliasNode->Object = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, TargetNode);
240     return_ACPI_STATUS (Status);
241 }
242 
243 
244 /*******************************************************************************
245  *
246  * FUNCTION:    AcpiExCreateEvent
247  *
248  * PARAMETERS:  WalkState           - Current state
249  *
250  * RETURN:      Status
251  *
252  * DESCRIPTION: Create a new event object
253  *
254  ******************************************************************************/
255 
256 ACPI_STATUS
AcpiExCreateEvent(ACPI_WALK_STATE * WalkState)257 AcpiExCreateEvent (
258     ACPI_WALK_STATE         *WalkState)
259 {
260     ACPI_STATUS             Status;
261     ACPI_OPERAND_OBJECT     *ObjDesc;
262 
263 
264     ACPI_FUNCTION_TRACE (ExCreateEvent);
265 
266 
267     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_EVENT);
268     if (!ObjDesc)
269     {
270         Status = AE_NO_MEMORY;
271         goto Cleanup;
272     }
273 
274     /*
275      * Create the actual OS semaphore, with zero initial units -- meaning
276      * that the event is created in an unsignalled state
277      */
278     Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0,
279         &ObjDesc->Event.OsSemaphore);
280     if (ACPI_FAILURE (Status))
281     {
282         goto Cleanup;
283     }
284 
285     /* Attach object to the Node */
286 
287     Status = AcpiNsAttachObject (
288         (ACPI_NAMESPACE_NODE *) WalkState->Operands[0],
289         ObjDesc, ACPI_TYPE_EVENT);
290 
291 Cleanup:
292     /*
293      * Remove local reference to the object (on error, will cause deletion
294      * of both object and semaphore if present.)
295      */
296     AcpiUtRemoveReference (ObjDesc);
297     return_ACPI_STATUS (Status);
298 }
299 
300 
301 /*******************************************************************************
302  *
303  * FUNCTION:    AcpiExCreateMutex
304  *
305  * PARAMETERS:  WalkState           - Current state
306  *
307  * RETURN:      Status
308  *
309  * DESCRIPTION: Create a new mutex object
310  *
311  *              Mutex (Name[0], SyncLevel[1])
312  *
313  ******************************************************************************/
314 
315 ACPI_STATUS
AcpiExCreateMutex(ACPI_WALK_STATE * WalkState)316 AcpiExCreateMutex (
317     ACPI_WALK_STATE         *WalkState)
318 {
319     ACPI_STATUS             Status = AE_OK;
320     ACPI_OPERAND_OBJECT     *ObjDesc;
321 
322 
323     ACPI_FUNCTION_TRACE_PTR (ExCreateMutex, ACPI_WALK_OPERANDS);
324 
325 
326     /* Create the new mutex object */
327 
328     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_MUTEX);
329     if (!ObjDesc)
330     {
331         Status = AE_NO_MEMORY;
332         goto Cleanup;
333     }
334 
335     /* Create the actual OS Mutex */
336 
337     Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex);
338     if (ACPI_FAILURE (Status))
339     {
340         goto Cleanup;
341     }
342 
343     /* Init object and attach to NS node */
344 
345     ObjDesc->Mutex.SyncLevel = (UINT8) WalkState->Operands[1]->Integer.Value;
346     ObjDesc->Mutex.Node = (ACPI_NAMESPACE_NODE *) WalkState->Operands[0];
347 
348     Status = AcpiNsAttachObject (
349         ObjDesc->Mutex.Node, ObjDesc, ACPI_TYPE_MUTEX);
350 
351 
352 Cleanup:
353     /*
354      * Remove local reference to the object (on error, will cause deletion
355      * of both object and semaphore if present.)
356      */
357     AcpiUtRemoveReference (ObjDesc);
358     return_ACPI_STATUS (Status);
359 }
360 
361 
362 /*******************************************************************************
363  *
364  * FUNCTION:    AcpiExCreateRegion
365  *
366  * PARAMETERS:  AmlStart            - Pointer to the region declaration AML
367  *              AmlLength           - Max length of the declaration AML
368  *              SpaceId             - Address space ID for the region
369  *              WalkState           - Current state
370  *
371  * RETURN:      Status
372  *
373  * DESCRIPTION: Create a new operation region object
374  *
375  ******************************************************************************/
376 
377 ACPI_STATUS
AcpiExCreateRegion(UINT8 * AmlStart,UINT32 AmlLength,UINT8 SpaceId,ACPI_WALK_STATE * WalkState)378 AcpiExCreateRegion (
379     UINT8                   *AmlStart,
380     UINT32                  AmlLength,
381     UINT8                   SpaceId,
382     ACPI_WALK_STATE         *WalkState)
383 {
384     ACPI_STATUS             Status;
385     ACPI_OPERAND_OBJECT     *ObjDesc;
386     ACPI_NAMESPACE_NODE     *Node;
387     ACPI_OPERAND_OBJECT     *RegionObj2;
388 
389 
390     ACPI_FUNCTION_TRACE (ExCreateRegion);
391 
392 
393     /* Get the Namespace Node */
394 
395     Node = WalkState->Op->Common.Node;
396 
397     /*
398      * If the region object is already attached to this node,
399      * just return
400      */
401     if (AcpiNsGetAttachedObject (Node))
402     {
403         return_ACPI_STATUS (AE_OK);
404     }
405 
406     /*
407      * Space ID must be one of the predefined IDs, or in the user-defined
408      * range
409      */
410     if (!AcpiIsValidSpaceId (SpaceId))
411     {
412         /*
413          * Print an error message, but continue. We don't want to abort
414          * a table load for this exception. Instead, if the region is
415          * actually used at runtime, abort the executing method.
416          */
417         ACPI_ERROR ((AE_INFO,
418             "Invalid/unknown Address Space ID: 0x%2.2X", SpaceId));
419     }
420 
421     ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "Region Type - %s (0x%X)\n",
422         AcpiUtGetRegionName (SpaceId), SpaceId));
423 
424     /* Create the region descriptor */
425 
426     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_REGION);
427     if (!ObjDesc)
428     {
429         Status = AE_NO_MEMORY;
430         goto Cleanup;
431     }
432 
433     /*
434      * Remember location in AML stream of address & length
435      * operands since they need to be evaluated at run time.
436      */
437     RegionObj2 = AcpiNsGetSecondaryObject (ObjDesc);
438     RegionObj2->Extra.AmlStart = AmlStart;
439     RegionObj2->Extra.AmlLength = AmlLength;
440     RegionObj2->Extra.Method_REG = NULL;
441     if (WalkState->ScopeInfo)
442     {
443         RegionObj2->Extra.ScopeNode = WalkState->ScopeInfo->Scope.Node;
444     }
445     else
446     {
447         RegionObj2->Extra.ScopeNode = Node;
448     }
449 
450     /* Init the region from the operands */
451 
452     ObjDesc->Region.SpaceId = SpaceId;
453     ObjDesc->Region.Address = 0;
454     ObjDesc->Region.Length = 0;
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 #endif
577 
578 
579 /*******************************************************************************
580  *
581  * FUNCTION:    AcpiExCreateMethod
582  *
583  * PARAMETERS:  AmlStart        - First byte of the method's AML
584  *              AmlLength       - AML byte count for this method
585  *              WalkState       - Current state
586  *
587  * RETURN:      Status
588  *
589  * DESCRIPTION: Create a new method object
590  *
591  ******************************************************************************/
592 
593 ACPI_STATUS
AcpiExCreateMethod(UINT8 * AmlStart,UINT32 AmlLength,ACPI_WALK_STATE * WalkState)594 AcpiExCreateMethod (
595     UINT8                   *AmlStart,
596     UINT32                  AmlLength,
597     ACPI_WALK_STATE         *WalkState)
598 {
599     ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
600     ACPI_OPERAND_OBJECT     *ObjDesc;
601     ACPI_STATUS             Status;
602     UINT8                   MethodFlags;
603 
604 
605     ACPI_FUNCTION_TRACE_PTR (ExCreateMethod, WalkState);
606 
607 
608     /* Create a new method object */
609 
610     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_METHOD);
611     if (!ObjDesc)
612     {
613        Status = AE_NO_MEMORY;
614        goto Exit;
615     }
616 
617     /* Save the method's AML pointer and length  */
618 
619     ObjDesc->Method.AmlStart = AmlStart;
620     ObjDesc->Method.AmlLength = AmlLength;
621     ObjDesc->Method.Node = Operand[0];
622 
623     /*
624      * Disassemble the method flags. Split off the ArgCount, Serialized
625      * flag, and SyncLevel for efficiency.
626      */
627     MethodFlags = (UINT8) Operand[1]->Integer.Value;
628     ObjDesc->Method.ParamCount = (UINT8)
629         (MethodFlags & AML_METHOD_ARG_COUNT);
630 
631     /*
632      * Get the SyncLevel. If method is serialized, a mutex will be
633      * created for this method when it is parsed.
634      */
635     if (MethodFlags & AML_METHOD_SERIALIZED)
636     {
637         ObjDesc->Method.InfoFlags = ACPI_METHOD_SERIALIZED;
638 
639         /*
640          * ACPI 1.0: SyncLevel = 0
641          * ACPI 2.0: SyncLevel = SyncLevel in method declaration
642          */
643         ObjDesc->Method.SyncLevel = (UINT8)
644             ((MethodFlags & AML_METHOD_SYNC_LEVEL) >> 4);
645     }
646 
647     /* Attach the new object to the method Node */
648 
649     Status = AcpiNsAttachObject ((ACPI_NAMESPACE_NODE *) Operand[0],
650         ObjDesc, ACPI_TYPE_METHOD);
651 
652     /* Remove local reference to the object */
653 
654     AcpiUtRemoveReference (ObjDesc);
655 
656 Exit:
657     /* Remove a reference to the operand */
658 
659     AcpiUtRemoveReference (Operand[1]);
660     return_ACPI_STATUS (Status);
661 }
662