sys/contrib/dev/acpica/source/components/dispatcher/dswload2.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dswload2 - Dispatcher second pass namespace load callbacks
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2017, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include "acpi.h"
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "amlcode.h"
  48 #include "acdispat.h"
  49 #include "acinterp.h"
  50 #include "acnamesp.h"
  51 #include "acevents.h"
  52
  53 #define _COMPONENT          ACPI_DISPATCHER
  54         ACPI_MODULE_NAME    ("dswload2")
  55
  56
  57 /*******************************************************************************
  58  *
  59  * FUNCTION:    AcpiDsLoad2BeginOp
  60  *
  61  * PARAMETERS:  WalkState       - Current state of the parse tree walk
  62  *              OutOp           - Wher to return op if a new one is created
  63  *
  64  * RETURN:      Status
  65  *
  66  * DESCRIPTION: Descending callback used during the loading of ACPI tables.
  67  *
  68  ******************************************************************************/
  69
  70 ACPI_STATUS
  71 AcpiDsLoad2BeginOp (
  72     ACPI_WALK_STATE         *WalkState,
  73     ACPI_PARSE_OBJECT       **OutOp)
  74 {
  75     ACPI_PARSE_OBJECT       *Op;
  76     ACPI_NAMESPACE_NODE     *Node;
  77     ACPI_STATUS             Status;
  78     ACPI_OBJECT_TYPE        ObjectType;
  79     char                    *BufferPtr;
  80     UINT32                  Flags;
  81
  82
  83     ACPI_FUNCTION_TRACE (DsLoad2BeginOp);
  84
  85
  86     Op = WalkState->Op;
  87     ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op=%p State=%p\n", Op, WalkState));
  88
  89     if (Op)
  90     {
  91         if ((WalkState->ControlState) &&
  92             (WalkState->ControlState->Common.State ==
  93                 ACPI_CONTROL_CONDITIONAL_EXECUTING))
  94         {
  95             /* We are executing a while loop outside of a method */
  96
  97             Status = AcpiDsExecBeginOp (WalkState, OutOp);
  98             return_ACPI_STATUS (Status);
  99         }
 100
 101         /* We only care about Namespace opcodes here */
 102
 103         if ((!(WalkState->OpInfo->Flags & AML_NSOPCODE)   &&
 104               (WalkState->Opcode != AML_INT_NAMEPATH_OP)) ||
 105             (!(WalkState->OpInfo->Flags & AML_NAMED)))
 106         {
 107             return_ACPI_STATUS (AE_OK);
 108         }
 109
 110         /* Get the name we are going to enter or lookup in the namespace */
 111
 112         if (WalkState->Opcode == AML_INT_NAMEPATH_OP)
 113         {
 114             /* For Namepath op, get the path string */
 115
 116             BufferPtr = Op->Common.Value.String;
 117             if (!BufferPtr)
 118             {
 119                 /* No name, just exit */
 120
 121                 return_ACPI_STATUS (AE_OK);
 122             }
 123         }
 124         else
 125         {
 126             /* Get name from the op */
 127
 128             BufferPtr = ACPI_CAST_PTR (char, &Op->Named.Name);
 129         }
 130     }
 131     else
 132     {
 133         /* Get the namestring from the raw AML */
 134
 135         BufferPtr = AcpiPsGetNextNamestring (&WalkState->ParserState);
 136     }
 137
 138     /* Map the opcode into an internal object type */
 139
 140     ObjectType = WalkState->OpInfo->ObjectType;
 141
 142     ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
 143         "State=%p Op=%p Type=%X\n", WalkState, Op, ObjectType));
 144
 145     switch (WalkState->Opcode)
 146     {
 147     case AML_FIELD_OP:
 148     case AML_BANK_FIELD_OP:
 149     case AML_INDEX_FIELD_OP:
 150
 151         Node = NULL;
 152         Status = AE_OK;
 153         break;
 154
 155     case AML_INT_NAMEPATH_OP:
 156         /*
 157          * The NamePath is an object reference to an existing object.
 158          * Don't enter the name into the namespace, but look it up
 159          * for use later.
 160          */
 161         Status = AcpiNsLookup (WalkState->ScopeInfo, BufferPtr, ObjectType,
 162             ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 163             WalkState, &(Node));
 164         break;
 165
 166     case AML_SCOPE_OP:
 167
 168         /* Special case for Scope(\) -> refers to the Root node */
 169
 170         if (Op && (Op->Named.Node == AcpiGbl_RootNode))
 171         {
 172             Node = Op->Named.Node;
 173
 174             Status = AcpiDsScopeStackPush (Node, ObjectType, WalkState);
 175             if (ACPI_FAILURE (Status))
 176             {
 177                 return_ACPI_STATUS (Status);
 178             }
 179         }
 180         else
 181         {
 182             /*
 183              * The Path is an object reference to an existing object.
 184              * Don't enter the name into the namespace, but look it up
 185              * for use later.
 186              */
 187             Status = AcpiNsLookup (WalkState->ScopeInfo, BufferPtr, ObjectType,
 188                 ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT,
 189                 WalkState, &(Node));
 190             if (ACPI_FAILURE (Status))
 191             {
 192 #ifdef ACPI_ASL_COMPILER
 193                 if (Status == AE_NOT_FOUND)
 194                 {
 195                     Status = AE_OK;
 196                 }
 197                 else
 198                 {
 199                     ACPI_ERROR_NAMESPACE (BufferPtr, Status);
 200                 }
 201 #else
 202                 ACPI_ERROR_NAMESPACE (BufferPtr, Status);
 203 #endif
 204                 return_ACPI_STATUS (Status);
 205             }
 206         }
 207
 208         /*
 209          * We must check to make sure that the target is
 210          * one of the opcodes that actually opens a scope
 211          */
 212         switch (Node->Type)
 213         {
 214         case ACPI_TYPE_ANY:
 215         case ACPI_TYPE_LOCAL_SCOPE:         /* Scope */
 216         case ACPI_TYPE_DEVICE:
 217         case ACPI_TYPE_POWER:
 218         case ACPI_TYPE_PROCESSOR:
 219         case ACPI_TYPE_THERMAL:
 220
 221             /* These are acceptable types */
 222             break;
 223
 224         case ACPI_TYPE_INTEGER:
 225         case ACPI_TYPE_STRING:
 226         case ACPI_TYPE_BUFFER:
 227
 228             /*
 229              * These types we will allow, but we will change the type.
 230              * This enables some existing code of the form:
 231              *
 232              *  Name (DEB, 0)
 233              *  Scope (DEB) { ... }
 234              */
 235             ACPI_WARNING ((AE_INFO,
 236                 "Type override - [%4.4s] had invalid type (%s) "
 237                 "for Scope operator, changed to type ANY",
 238                 AcpiUtGetNodeName (Node), AcpiUtGetTypeName (Node->Type)));
 239
 240             Node->Type = ACPI_TYPE_ANY;
 241             WalkState->ScopeInfo->Common.Value = ACPI_TYPE_ANY;
 242             break;
 243
 244         case ACPI_TYPE_METHOD:
 245
 246             /*
 247              * Allow scope change to root during execution of module-level
 248              * code. Root is typed METHOD during this time.
 249              */
 250             if ((Node == AcpiGbl_RootNode) &&
 251                 (WalkState->ParseFlags & ACPI_PARSE_MODULE_LEVEL))
 252             {
 253                 break;
 254             }
 255
 256             /*lint -fallthrough */
 257
 258         default:
 259
 260             /* All other types are an error */
 261
 262             ACPI_ERROR ((AE_INFO,
 263                 "Invalid type (%s) for target of "
 264                 "Scope operator [%4.4s] (Cannot override)",
 265                 AcpiUtGetTypeName (Node->Type), AcpiUtGetNodeName (Node)));
 266
 267             return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 268         }
 269         break;
 270
 271     default:
 272
 273         /* All other opcodes */
 274
 275         if (Op && Op->Common.Node)
 276         {
 277             /* This op/node was previously entered into the namespace */
 278
 279             Node = Op->Common.Node;
 280
 281             if (AcpiNsOpensScope (ObjectType))
 282             {
 283                 Status = AcpiDsScopeStackPush (Node, ObjectType, WalkState);
 284                 if (ACPI_FAILURE (Status))
 285                 {
 286                     return_ACPI_STATUS (Status);
 287                 }
 288             }
 289
 290             return_ACPI_STATUS (AE_OK);
 291         }
 292
 293         /*
 294          * Enter the named type into the internal namespace. We enter the name
 295          * as we go downward in the parse tree. Any necessary subobjects that
 296          * involve arguments to the opcode must be created as we go back up the
 297          * parse tree later.
 298          *
 299          * Note: Name may already exist if we are executing a deferred opcode.
 300          */
 301         if (WalkState->DeferredNode)
 302         {
 303             /* This name is already in the namespace, get the node */
 304
 305             Node = WalkState->DeferredNode;
 306             Status = AE_OK;
 307             break;
 308         }
 309
 310         Flags = ACPI_NS_NO_UPSEARCH;
 311         if (WalkState->PassNumber == ACPI_IMODE_EXECUTE)
 312         {
 313             /* Execution mode, node cannot already exist, node is temporary */
 314
 315             Flags |= ACPI_NS_ERROR_IF_FOUND;
 316
 317             if (!(WalkState->ParseFlags & ACPI_PARSE_MODULE_LEVEL))
 318             {
 319                 Flags |= ACPI_NS_TEMPORARY;
 320             }
 321         }
 322
 323         /* Add new entry or lookup existing entry */
 324
 325         Status = AcpiNsLookup (WalkState->ScopeInfo, BufferPtr, ObjectType,
 326             ACPI_IMODE_LOAD_PASS2, Flags, WalkState, &Node);
 327
 328         if (ACPI_SUCCESS (Status) && (Flags & ACPI_NS_TEMPORARY))
 329         {
 330             ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
 331                 "***New Node [%4.4s] %p is temporary\n",
 332                 AcpiUtGetNodeName (Node), Node));
 333         }
 334         break;
 335     }
 336
 337     if (ACPI_FAILURE (Status))
 338     {
 339         ACPI_ERROR_NAMESPACE (BufferPtr, Status);
 340         return_ACPI_STATUS (Status);
 341     }
 342
 343     if (!Op)
 344     {
 345         /* Create a new op */
 346
 347         Op = AcpiPsAllocOp (WalkState->Opcode, WalkState->Aml);
 348         if (!Op)
 349         {
 350             return_ACPI_STATUS (AE_NO_MEMORY);
 351         }
 352
 353         /* Initialize the new op */
 354
 355         if (Node)
 356         {
 357             Op->Named.Name = Node->Name.Integer;
 358         }
 359         *OutOp = Op;
 360     }
 361
 362     /*
 363      * Put the Node in the "op" object that the parser uses, so we
 364      * can get it again quickly when this scope is closed
 365      */
 366     Op->Common.Node = Node;
 367     return_ACPI_STATUS (Status);
 368 }
 369
 370
 371 /*******************************************************************************
 372  *
 373  * FUNCTION:    AcpiDsLoad2EndOp
 374  *
 375  * PARAMETERS:  WalkState       - Current state of the parse tree walk
 376  *
 377  * RETURN:      Status
 378  *
 379  * DESCRIPTION: Ascending callback used during the loading of the namespace,
 380  *              both control methods and everything else.
 381  *
 382  ******************************************************************************/
 383
 384 ACPI_STATUS
 385 AcpiDsLoad2EndOp (
 386     ACPI_WALK_STATE         *WalkState)
 387 {
 388     ACPI_PARSE_OBJECT       *Op;
 389     ACPI_STATUS             Status = AE_OK;
 390     ACPI_OBJECT_TYPE        ObjectType;
 391     ACPI_NAMESPACE_NODE     *Node;
 392     ACPI_PARSE_OBJECT       *Arg;
 393     ACPI_NAMESPACE_NODE     *NewNode;
 394 #ifndef ACPI_NO_METHOD_EXECUTION
 395     UINT32                  i;
 396     UINT8                   RegionSpace;
 397 #endif
 398
 399
 400     ACPI_FUNCTION_TRACE (DsLoad2EndOp);
 401
 402     Op = WalkState->Op;
 403     ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
 404         WalkState->OpInfo->Name, Op, WalkState));
 405
 406     /* Check if opcode had an associated namespace object */
 407
 408     if (!(WalkState->OpInfo->Flags & AML_NSOBJECT))
 409     {
 410         return_ACPI_STATUS (AE_OK);
 411     }
 412
 413     if (Op->Common.AmlOpcode == AML_SCOPE_OP)
 414     {
 415         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
 416             "Ending scope Op=%p State=%p\n", Op, WalkState));
 417     }
 418
 419     ObjectType = WalkState->OpInfo->ObjectType;
 420
 421     /*
 422      * Get the Node/name from the earlier lookup
 423      * (It was saved in the *op structure)
 424      */
 425     Node = Op->Common.Node;
 426
 427     /*
 428      * Put the Node on the object stack (Contains the ACPI Name of
 429      * this object)
 430      */
 431     WalkState->Operands[0] = (void *) Node;
 432     WalkState->NumOperands = 1;
 433
 434     /* Pop the scope stack */
 435
 436     if (AcpiNsOpensScope (ObjectType) &&
 437        (Op->Common.AmlOpcode != AML_INT_METHODCALL_OP))
 438     {
 439         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "(%s) Popping scope for Op %p\n",
 440             AcpiUtGetTypeName (ObjectType), Op));
 441
 442         Status = AcpiDsScopeStackPop (WalkState);
 443         if (ACPI_FAILURE (Status))
 444         {
 445             goto Cleanup;
 446         }
 447     }
 448
 449     /*
 450      * Named operations are as follows:
 451      *
 452      * AML_ALIAS
 453      * AML_BANKFIELD
 454      * AML_CREATEBITFIELD
 455      * AML_CREATEBYTEFIELD
 456      * AML_CREATEDWORDFIELD
 457      * AML_CREATEFIELD
 458      * AML_CREATEQWORDFIELD
 459      * AML_CREATEWORDFIELD
 460      * AML_DATA_REGION
 461      * AML_DEVICE
 462      * AML_EVENT
 463      * AML_FIELD
 464      * AML_INDEXFIELD
 465      * AML_METHOD
 466      * AML_METHODCALL
 467      * AML_MUTEX
 468      * AML_NAME
 469      * AML_NAMEDFIELD
 470      * AML_OPREGION
 471      * AML_POWERRES
 472      * AML_PROCESSOR
 473      * AML_SCOPE
 474      * AML_THERMALZONE
 475      */
 476
 477     ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
 478         "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
 479         AcpiPsGetOpcodeName (Op->Common.AmlOpcode), WalkState, Op, Node));
 480
 481     /* Decode the opcode */
 482
 483     Arg = Op->Common.Value.Arg;
 484
 485     switch (WalkState->OpInfo->Type)
 486     {
 487 #ifndef ACPI_NO_METHOD_EXECUTION
 488
 489     case AML_TYPE_CREATE_FIELD:
 490         /*
 491          * Create the field object, but the field buffer and index must
 492          * be evaluated later during the execution phase
 493          */
 494         Status = AcpiDsCreateBufferField (Op, WalkState);
 495         break;
 496
 497      case AML_TYPE_NAMED_FIELD:
 498         /*
 499          * If we are executing a method, initialize the field
 500          */
 501         if (WalkState->MethodNode)
 502         {
 503             Status = AcpiDsInitFieldObjects (Op, WalkState);
 504         }
 505
 506         switch (Op->Common.AmlOpcode)
 507         {
 508         case AML_INDEX_FIELD_OP:
 509
 510             Status = AcpiDsCreateIndexField (
 511                 Op, (ACPI_HANDLE) Arg->Common.Node, WalkState);
 512             break;
 513
 514         case AML_BANK_FIELD_OP:
 515
 516             Status = AcpiDsCreateBankField (Op, Arg->Common.Node, WalkState);
 517             break;
 518
 519         case AML_FIELD_OP:
 520
 521             Status = AcpiDsCreateField (Op, Arg->Common.Node, WalkState);
 522             break;
 523
 524         default:
 525
 526             /* All NAMED_FIELD opcodes must be handled above */
 527             break;
 528         }
 529         break;
 530
 531      case AML_TYPE_NAMED_SIMPLE:
 532
 533         Status = AcpiDsCreateOperands (WalkState, Arg);
 534         if (ACPI_FAILURE (Status))
 535         {
 536             goto Cleanup;
 537         }
 538
 539         switch (Op->Common.AmlOpcode)
 540         {
 541         case AML_PROCESSOR_OP:
 542
 543             Status = AcpiExCreateProcessor (WalkState);
 544             break;
 545
 546         case AML_POWER_RESOURCE_OP:
 547
 548             Status = AcpiExCreatePowerResource (WalkState);
 549             break;
 550
 551         case AML_MUTEX_OP:
 552
 553             Status = AcpiExCreateMutex (WalkState);
 554             break;
 555
 556         case AML_EVENT_OP:
 557
 558             Status = AcpiExCreateEvent (WalkState);
 559             break;
 560
 561         case AML_ALIAS_OP:
 562
 563             Status = AcpiExCreateAlias (WalkState);
 564             break;
 565
 566         default:
 567
 568             /* Unknown opcode */
 569
 570             Status = AE_OK;
 571             goto Cleanup;
 572         }
 573
 574         /* Delete operands */
 575
 576         for (i = 1; i < WalkState->NumOperands; i++)
 577         {
 578             AcpiUtRemoveReference (WalkState->Operands[i]);
 579             WalkState->Operands[i] = NULL;
 580         }
 581
 582         break;
 583 #endif /* ACPI_NO_METHOD_EXECUTION */
 584
 585     case AML_TYPE_NAMED_COMPLEX:
 586
 587         switch (Op->Common.AmlOpcode)
 588         {
 589 #ifndef ACPI_NO_METHOD_EXECUTION
 590         case AML_REGION_OP:
 591         case AML_DATA_REGION_OP:
 592
 593             if (Op->Common.AmlOpcode == AML_REGION_OP)
 594             {
 595                 RegionSpace = (ACPI_ADR_SPACE_TYPE)
 596                     ((Op->Common.Value.Arg)->Common.Value.Integer);
 597             }
 598             else
 599             {
 600                 RegionSpace = ACPI_ADR_SPACE_DATA_TABLE;
 601             }
 602
 603             /*
 604              * The OpRegion is not fully parsed at this time. The only valid
 605              * argument is the SpaceId. (We must save the address of the
 606              * AML of the address and length operands)
 607              *
 608              * If we have a valid region, initialize it. The namespace is
 609              * unlocked at this point.
 610              *
 611              * Need to unlock interpreter if it is locked (if we are running
 612              * a control method), in order to allow _REG methods to be run
 613              * during AcpiEvInitializeRegion.
 614              */
 615             if (WalkState->MethodNode)
 616             {
 617                 /*
 618                  * Executing a method: initialize the region and unlock
 619                  * the interpreter
 620                  */
 621                 Status = AcpiExCreateRegion (Op->Named.Data,
 622                     Op->Named.Length, RegionSpace, WalkState);
 623                 if (ACPI_FAILURE (Status))
 624                 {
 625                     return_ACPI_STATUS (Status);
 626                 }
 627             }
 628
 629             Status = AcpiEvInitializeRegion (
 630                 AcpiNsGetAttachedObject (Node));
 631             break;
 632
 633         case AML_NAME_OP:
 634
 635             Status = AcpiDsCreateNode (WalkState, Node, Op);
 636             break;
 637
 638         case AML_METHOD_OP:
 639             /*
 640              * MethodOp PkgLength NameString MethodFlags TermList
 641              *
 642              * Note: We must create the method node/object pair as soon as we
 643              * see the method declaration. This allows later pass1 parsing
 644              * of invocations of the method (need to know the number of
 645              * arguments.)
 646              */
 647             ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
 648                 "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 649                 WalkState, Op, Op->Named.Node));
 650
 651             if (!AcpiNsGetAttachedObject (Op->Named.Node))
 652             {
 653                 WalkState->Operands[0] = ACPI_CAST_PTR (void, Op->Named.Node);
 654                 WalkState->NumOperands = 1;
 655
 656                 Status = AcpiDsCreateOperands (
 657                     WalkState, Op->Common.Value.Arg);
 658                 if (ACPI_SUCCESS (Status))
 659                 {
 660                     Status = AcpiExCreateMethod (
 661                         Op->Named.Data, Op->Named.Length, WalkState);
 662                 }
 663
 664                 WalkState->Operands[0] = NULL;
 665                 WalkState->NumOperands = 0;
 666
 667                 if (ACPI_FAILURE (Status))
 668                 {
 669                     return_ACPI_STATUS (Status);
 670                 }
 671             }
 672             break;
 673
 674 #endif /* ACPI_NO_METHOD_EXECUTION */
 675
 676         default:
 677
 678             /* All NAMED_COMPLEX opcodes must be handled above */
 679             break;
 680         }
 681         break;
 682
 683     case AML_CLASS_INTERNAL:
 684
 685         /* case AML_INT_NAMEPATH_OP: */
 686         break;
 687
 688     case AML_CLASS_METHOD_CALL:
 689
 690         ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
 691             "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
 692             WalkState, Op, Node));
 693
 694         /*
 695          * Lookup the method name and save the Node
 696          */
 697         Status = AcpiNsLookup (WalkState->ScopeInfo, Arg->Common.Value.String,
 698             ACPI_TYPE_ANY, ACPI_IMODE_LOAD_PASS2,
 699             ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
 700             WalkState, &(NewNode));
 701         if (ACPI_SUCCESS (Status))
 702         {
 703             /*
 704              * Make sure that what we found is indeed a method
 705              * We didn't search for a method on purpose, to see if the name
 706              * would resolve
 707              */
 708             if (NewNode->Type != ACPI_TYPE_METHOD)
 709             {
 710                 Status = AE_AML_OPERAND_TYPE;
 711             }
 712
 713             /* We could put the returned object (Node) on the object stack for
 714              * later, but for now, we will put it in the "op" object that the
 715              * parser uses, so we can get it again at the end of this scope
 716              */
 717             Op->Common.Node = NewNode;
 718         }
 719         else
 720         {
 721             ACPI_ERROR_NAMESPACE (Arg->Common.Value.String, Status);
 722         }
 723         break;
 724
 725
 726     default:
 727
 728         break;
 729     }
 730
 731 Cleanup:
 732
 733     /* Remove the Node pushed at the very beginning */
 734
 735     WalkState->Operands[0] = NULL;
 736     WalkState->NumOperands = 0;
 737     return_ACPI_STATUS (Status);
 738 }