reactos/drivers/bus/acpi/acpica/executer/excreate.c

   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 - 2015, 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 #include "acpi.h"
 118 #include "accommon.h"
 119 #include "acinterp.h"
 120 #include "amlcode.h"
 121 #include "acnamesp.h"
 122
 123
 124 #define _COMPONENT          ACPI_EXECUTER
 125         ACPI_MODULE_NAME    ("excreate")
 126
 127
 128 #ifndef ACPI_NO_METHOD_EXECUTION
 129 /*******************************************************************************
 130  *
 131  * FUNCTION:    AcpiExCreateAlias
 132  *
 133  * PARAMETERS:  WalkState            - Current state, contains operands
 134  *
 135  * RETURN:      Status
 136  *
 137  * DESCRIPTION: Create a new named alias
 138  *
 139  ******************************************************************************/
 140
 141 ACPI_STATUS
 142 AcpiExCreateAlias (
 143     ACPI_WALK_STATE         *WalkState)
 144 {
 145     ACPI_NAMESPACE_NODE     *TargetNode;
 146     ACPI_NAMESPACE_NODE     *AliasNode;
 147     ACPI_STATUS             Status = AE_OK;
 148
 149
 150     ACPI_FUNCTION_TRACE (ExCreateAlias);
 151
 152
 153     /* Get the source/alias operands (both namespace nodes) */
 154
 155     AliasNode =  (ACPI_NAMESPACE_NODE *) WalkState->Operands[0];
 156     TargetNode = (ACPI_NAMESPACE_NODE *) WalkState->Operands[1];
 157
 158     if ((TargetNode->Type == ACPI_TYPE_LOCAL_ALIAS)  ||
 159         (TargetNode->Type == ACPI_TYPE_LOCAL_METHOD_ALIAS))
 160     {
 161         /*
 162          * Dereference an existing alias so that we don't create a chain
 163          * of aliases. With this code, we guarantee that an alias is
 164          * always exactly one level of indirection away from the
 165          * actual aliased name.
 166          */
 167         TargetNode = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, TargetNode->Object);
 168     }
 169
 170     /*
 171      * For objects that can never change (i.e., the NS node will
 172      * permanently point to the same object), we can simply attach
 173      * the object to the new NS node. For other objects (such as
 174      * Integers, buffers, etc.), we have to point the Alias node
 175      * to the original Node.
 176      */
 177     switch (TargetNode->Type)
 178     {
 179
 180     /* For these types, the sub-object can change dynamically via a Store */
 181
 182     case ACPI_TYPE_INTEGER:
 183     case ACPI_TYPE_STRING:
 184     case ACPI_TYPE_BUFFER:
 185     case ACPI_TYPE_PACKAGE:
 186     case ACPI_TYPE_BUFFER_FIELD:
 187     /*
 188      * These types open a new scope, so we need the NS node in order to access
 189      * any children.
 190      */
 191     case ACPI_TYPE_DEVICE:
 192     case ACPI_TYPE_POWER:
 193     case ACPI_TYPE_PROCESSOR:
 194     case ACPI_TYPE_THERMAL:
 195     case ACPI_TYPE_LOCAL_SCOPE:
 196         /*
 197          * The new alias has the type ALIAS and points to the original
 198          * NS node, not the object itself.
 199          */
 200         AliasNode->Type = ACPI_TYPE_LOCAL_ALIAS;
 201         AliasNode->Object = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, TargetNode);
 202         break;
 203
 204     case ACPI_TYPE_METHOD:
 205         /*
 206          * Control method aliases need to be differentiated
 207          */
 208         AliasNode->Type = ACPI_TYPE_LOCAL_METHOD_ALIAS;
 209         AliasNode->Object = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, TargetNode);
 210         break;
 211
 212     default:
 213
 214         /* Attach the original source object to the new Alias Node */
 215
 216         /*
 217          * The new alias assumes the type of the target, and it points
 218          * to the same object. The reference count of the object has an
 219          * additional reference to prevent deletion out from under either the
 220          * target node or the alias Node
 221          */
 222         Status = AcpiNsAttachObject (AliasNode,
 223             AcpiNsGetAttachedObject (TargetNode), TargetNode->Type);
 224         break;
 225     }
 226
 227     /* Since both operands are Nodes, we don't need to delete them */
 228
 229     return_ACPI_STATUS (Status);
 230 }
 231
 232
 233 /*******************************************************************************
 234  *
 235  * FUNCTION:    AcpiExCreateEvent
 236  *
 237  * PARAMETERS:  WalkState           - Current state
 238  *
 239  * RETURN:      Status
 240  *
 241  * DESCRIPTION: Create a new event object
 242  *
 243  ******************************************************************************/
 244
 245 ACPI_STATUS
 246 AcpiExCreateEvent (
 247     ACPI_WALK_STATE         *WalkState)
 248 {
 249     ACPI_STATUS             Status;
 250     ACPI_OPERAND_OBJECT     *ObjDesc;
 251
 252
 253     ACPI_FUNCTION_TRACE (ExCreateEvent);
 254
 255
 256     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_EVENT);
 257     if (!ObjDesc)
 258     {
 259         Status = AE_NO_MEMORY;
 260         goto Cleanup;
 261     }
 262
 263     /*
 264      * Create the actual OS semaphore, with zero initial units -- meaning
 265      * that the event is created in an unsignalled state
 266      */
 267     Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0,
 268         &ObjDesc->Event.OsSemaphore);
 269     if (ACPI_FAILURE (Status))
 270     {
 271         goto Cleanup;
 272     }
 273
 274     /* Attach object to the Node */
 275
 276     Status = AcpiNsAttachObject (
 277         (ACPI_NAMESPACE_NODE *) WalkState->Operands[0],
 278         ObjDesc, ACPI_TYPE_EVENT);
 279
 280 Cleanup:
 281     /*
 282      * Remove local reference to the object (on error, will cause deletion
 283      * of both object and semaphore if present.)
 284      */
 285     AcpiUtRemoveReference (ObjDesc);
 286     return_ACPI_STATUS (Status);
 287 }
 288
 289
 290 /*******************************************************************************
 291  *
 292  * FUNCTION:    AcpiExCreateMutex
 293  *
 294  * PARAMETERS:  WalkState           - Current state
 295  *
 296  * RETURN:      Status
 297  *
 298  * DESCRIPTION: Create a new mutex object
 299  *
 300  *              Mutex (Name[0], SyncLevel[1])
 301  *
 302  ******************************************************************************/
 303
 304 ACPI_STATUS
 305 AcpiExCreateMutex (
 306     ACPI_WALK_STATE         *WalkState)
 307 {
 308     ACPI_STATUS             Status = AE_OK;
 309     ACPI_OPERAND_OBJECT     *ObjDesc;
 310
 311
 312     ACPI_FUNCTION_TRACE_PTR (ExCreateMutex, ACPI_WALK_OPERANDS);
 313
 314
 315     /* Create the new mutex object */
 316
 317     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_MUTEX);
 318     if (!ObjDesc)
 319     {
 320         Status = AE_NO_MEMORY;
 321         goto Cleanup;
 322     }
 323
 324     /* Create the actual OS Mutex */
 325
 326     Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex);
 327     if (ACPI_FAILURE (Status))
 328     {
 329         goto Cleanup;
 330     }
 331
 332     /* Init object and attach to NS node */
 333
 334     ObjDesc->Mutex.SyncLevel = (UINT8) WalkState->Operands[1]->Integer.Value;
 335     ObjDesc->Mutex.Node = (ACPI_NAMESPACE_NODE *) WalkState->Operands[0];
 336
 337     Status = AcpiNsAttachObject (
 338         ObjDesc->Mutex.Node, ObjDesc, ACPI_TYPE_MUTEX);
 339
 340
 341 Cleanup:
 342     /*
 343      * Remove local reference to the object (on error, will cause deletion
 344      * of both object and semaphore if present.)
 345      */
 346     AcpiUtRemoveReference (ObjDesc);
 347     return_ACPI_STATUS (Status);
 348 }
 349
 350
 351 /*******************************************************************************
 352  *
 353  * FUNCTION:    AcpiExCreateRegion
 354  *
 355  * PARAMETERS:  AmlStart            - Pointer to the region declaration AML
 356  *              AmlLength           - Max length of the declaration AML
 357  *              SpaceId             - Address space ID for the region
 358  *              WalkState           - Current state
 359  *
 360  * RETURN:      Status
 361  *
 362  * DESCRIPTION: Create a new operation region object
 363  *
 364  ******************************************************************************/
 365
 366 ACPI_STATUS
 367 AcpiExCreateRegion (
 368     UINT8                   *AmlStart,
 369     UINT32                  AmlLength,
 370     UINT8                   SpaceId,
 371     ACPI_WALK_STATE         *WalkState)
 372 {
 373     ACPI_STATUS             Status;
 374     ACPI_OPERAND_OBJECT     *ObjDesc;
 375     ACPI_NAMESPACE_NODE     *Node;
 376     ACPI_OPERAND_OBJECT     *RegionObj2;
 377
 378
 379     ACPI_FUNCTION_TRACE (ExCreateRegion);
 380
 381
 382     /* Get the Namespace Node */
 383
 384     Node = WalkState->Op->Common.Node;
 385
 386     /*
 387      * If the region object is already attached to this node,
 388      * just return
 389      */
 390     if (AcpiNsGetAttachedObject (Node))
 391     {
 392         return_ACPI_STATUS (AE_OK);
 393     }
 394
 395     /*
 396      * Space ID must be one of the predefined IDs, or in the user-defined
 397      * range
 398      */
 399     if (!AcpiIsValidSpaceId (SpaceId))
 400     {
 401         /*
 402          * Print an error message, but continue. We don't want to abort
 403          * a table load for this exception. Instead, if the region is
 404          * actually used at runtime, abort the executing method.
 405          */
 406         ACPI_ERROR ((AE_INFO,
 407             "Invalid/unknown Address Space ID: 0x%2.2X", SpaceId));
 408     }
 409
 410     ACPI_DEBUG_PRINT ((ACPI_DB_LOAD, "Region Type - %s (0x%X)\n",
 411         AcpiUtGetRegionName (SpaceId), SpaceId));
 412
 413     /* Create the region descriptor */
 414
 415     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_REGION);
 416     if (!ObjDesc)
 417     {
 418         Status = AE_NO_MEMORY;
 419         goto Cleanup;
 420     }
 421
 422     /*
 423      * Remember location in AML stream of address & length
 424      * operands since they need to be evaluated at run time.
 425      */
 426     RegionObj2 = AcpiNsGetSecondaryObject (ObjDesc);
 427     RegionObj2->Extra.AmlStart = AmlStart;
 428     RegionObj2->Extra.AmlLength = AmlLength;
 429     RegionObj2->Extra.Method_REG = NULL;
 430     if (WalkState->ScopeInfo)
 431     {
 432         RegionObj2->Extra.ScopeNode = WalkState->ScopeInfo->Scope.Node;
 433     }
 434     else
 435     {
 436         RegionObj2->Extra.ScopeNode = Node;
 437     }
 438
 439     /* Init the region from the operands */
 440
 441     ObjDesc->Region.SpaceId = SpaceId;
 442     ObjDesc->Region.Address = 0;
 443     ObjDesc->Region.Length = 0;
 444     ObjDesc->Region.Node = Node;
 445     ObjDesc->Region.Handler = NULL;
 446     ObjDesc->Common.Flags &=
 447         ~(AOPOBJ_SETUP_COMPLETE | AOPOBJ_REG_CONNECTED |
 448           AOPOBJ_OBJECT_INITIALIZED);
 449
 450     /* Install the new region object in the parent Node */
 451
 452     Status = AcpiNsAttachObject (Node, ObjDesc, ACPI_TYPE_REGION);
 453
 454
 455 Cleanup:
 456
 457     /* Remove local reference to the object */
 458
 459     AcpiUtRemoveReference (ObjDesc);
 460     return_ACPI_STATUS (Status);
 461 }
 462
 463
 464 /*******************************************************************************
 465  *
 466  * FUNCTION:    AcpiExCreateProcessor
 467  *
 468  * PARAMETERS:  WalkState           - Current state
 469  *
 470  * RETURN:      Status
 471  *
 472  * DESCRIPTION: Create a new processor object and populate the fields
 473  *
 474  *              Processor (Name[0], CpuID[1], PblockAddr[2], PblockLength[3])
 475  *
 476  ******************************************************************************/
 477
 478 ACPI_STATUS
 479 AcpiExCreateProcessor (
 480     ACPI_WALK_STATE         *WalkState)
 481 {
 482     ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
 483     ACPI_OPERAND_OBJECT     *ObjDesc;
 484     ACPI_STATUS             Status;
 485
 486
 487     ACPI_FUNCTION_TRACE_PTR (ExCreateProcessor, WalkState);
 488
 489
 490     /* Create the processor object */
 491
 492     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_PROCESSOR);
 493     if (!ObjDesc)
 494     {
 495         return_ACPI_STATUS (AE_NO_MEMORY);
 496     }
 497
 498     /* Initialize the processor object from the operands */
 499
 500     ObjDesc->Processor.ProcId = (UINT8) Operand[1]->Integer.Value;
 501     ObjDesc->Processor.Length = (UINT8) Operand[3]->Integer.Value;
 502     ObjDesc->Processor.Address = (ACPI_IO_ADDRESS) Operand[2]->Integer.Value;
 503
 504     /* Install the processor object in the parent Node */
 505
 506     Status = AcpiNsAttachObject ((ACPI_NAMESPACE_NODE *) Operand[0],
 507         ObjDesc, ACPI_TYPE_PROCESSOR);
 508
 509     /* Remove local reference to the object */
 510
 511     AcpiUtRemoveReference (ObjDesc);
 512     return_ACPI_STATUS (Status);
 513 }
 514
 515
 516 /*******************************************************************************
 517  *
 518  * FUNCTION:    AcpiExCreatePowerResource
 519  *
 520  * PARAMETERS:  WalkState           - Current state
 521  *
 522  * RETURN:      Status
 523  *
 524  * DESCRIPTION: Create a new PowerResource object and populate the fields
 525  *
 526  *              PowerResource (Name[0], SystemLevel[1], ResourceOrder[2])
 527  *
 528  ******************************************************************************/
 529
 530 ACPI_STATUS
 531 AcpiExCreatePowerResource (
 532     ACPI_WALK_STATE         *WalkState)
 533 {
 534     ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
 535     ACPI_STATUS             Status;
 536     ACPI_OPERAND_OBJECT     *ObjDesc;
 537
 538
 539     ACPI_FUNCTION_TRACE_PTR (ExCreatePowerResource, WalkState);
 540
 541
 542     /* Create the power resource object */
 543
 544     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_POWER);
 545     if (!ObjDesc)
 546     {
 547         return_ACPI_STATUS (AE_NO_MEMORY);
 548     }
 549
 550     /* Initialize the power object from the operands */
 551
 552     ObjDesc->PowerResource.SystemLevel = (UINT8) Operand[1]->Integer.Value;
 553     ObjDesc->PowerResource.ResourceOrder = (UINT16) Operand[2]->Integer.Value;
 554
 555     /* Install the  power resource object in the parent Node */
 556
 557     Status = AcpiNsAttachObject ((ACPI_NAMESPACE_NODE *) Operand[0],
 558         ObjDesc, ACPI_TYPE_POWER);
 559
 560     /* Remove local reference to the object */
 561
 562     AcpiUtRemoveReference (ObjDesc);
 563     return_ACPI_STATUS (Status);
 564 }
 565 #endif
 566
 567
 568 /*******************************************************************************
 569  *
 570  * FUNCTION:    AcpiExCreateMethod
 571  *
 572  * PARAMETERS:  AmlStart        - First byte of the method's AML
 573  *              AmlLength       - AML byte count for this method
 574  *              WalkState       - Current state
 575  *
 576  * RETURN:      Status
 577  *
 578  * DESCRIPTION: Create a new method object
 579  *
 580  ******************************************************************************/
 581
 582 ACPI_STATUS
 583 AcpiExCreateMethod (
 584     UINT8                   *AmlStart,
 585     UINT32                  AmlLength,
 586     ACPI_WALK_STATE         *WalkState)
 587 {
 588     ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
 589     ACPI_OPERAND_OBJECT     *ObjDesc;
 590     ACPI_STATUS             Status;
 591     UINT8                   MethodFlags;
 592
 593
 594     ACPI_FUNCTION_TRACE_PTR (ExCreateMethod, WalkState);
 595
 596
 597     /* Create a new method object */
 598
 599     ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_METHOD);
 600     if (!ObjDesc)
 601     {
 602        Status = AE_NO_MEMORY;
 603        goto Exit;
 604     }
 605
 606     /* Save the method's AML pointer and length  */
 607
 608     ObjDesc->Method.AmlStart = AmlStart;
 609     ObjDesc->Method.AmlLength = AmlLength;
 610     ObjDesc->Method.Node = Operand[0];
 611
 612     /*
 613      * Disassemble the method flags. Split off the ArgCount, Serialized
 614      * flag, and SyncLevel for efficiency.
 615      */
 616     MethodFlags = (UINT8) Operand[1]->Integer.Value;
 617     ObjDesc->Method.ParamCount = (UINT8)
 618         (MethodFlags & AML_METHOD_ARG_COUNT);
 619
 620     /*
 621      * Get the SyncLevel. If method is serialized, a mutex will be
 622      * created for this method when it is parsed.
 623      */
 624     if (MethodFlags & AML_METHOD_SERIALIZED)
 625     {
 626         ObjDesc->Method.InfoFlags = ACPI_METHOD_SERIALIZED;
 627
 628         /*
 629          * ACPI 1.0: SyncLevel = 0
 630          * ACPI 2.0: SyncLevel = SyncLevel in method declaration
 631          */
 632         ObjDesc->Method.SyncLevel = (UINT8)
 633             ((MethodFlags & AML_METHOD_SYNC_LEVEL) >> 4);
 634     }
 635
 636     /* Attach the new object to the method Node */
 637
 638     Status = AcpiNsAttachObject ((ACPI_NAMESPACE_NODE *) Operand[0],
 639         ObjDesc, ACPI_TYPE_METHOD);
 640
 641     /* Remove local reference to the object */
 642
 643     AcpiUtRemoveReference (ObjDesc);
 644
 645 Exit:
 646     /* Remove a reference to the operand */
 647
 648     AcpiUtRemoveReference (Operand[1]);
 649     return_ACPI_STATUS (Status);
 650 }