nsaccess.c revision 70243
1/******************************************************************************* 2 * 3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace 4 * $Revision: 116 $ 5 * 6 ******************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999, 2000, Intel Corp. 13 * All rights reserved. 14 * 15 * 2. License 16 * 17 * 2.1. This is your license from Intel Corp. under its intellectual property 18 * rights. You may have additional license terms from the party that provided 19 * you this software, covering your right to use that party's intellectual 20 * property rights. 21 * 22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23 * copy of the source code appearing in this file ("Covered Code") an 24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25 * base code distributed originally by Intel ("Original Intel Code") to copy, 26 * make derivatives, distribute, use and display any portion of the Covered 27 * Code in any form, with the right to sublicense such rights; and 28 * 29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30 * license (with the right to sublicense), under only those claims of Intel 31 * patents that are infringed by the Original Intel Code, to make, use, sell, 32 * offer to sell, and import the Covered Code and derivative works thereof 33 * solely to the minimum extent necessary to exercise the above copyright 34 * license, and in no event shall the patent license extend to any additions 35 * to or modifications of the Original Intel Code. No other license or right 36 * is granted directly or by implication, estoppel or otherwise; 37 * 38 * The above copyright and patent license is granted only if the following 39 * conditions are met: 40 * 41 * 3. Conditions 42 * 43 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44 * Redistribution of source code of any substantial portion of the Covered 45 * Code or modification with rights to further distribute source must include 46 * the above Copyright Notice, the above License, this list of Conditions, 47 * and the following Disclaimer and Export Compliance provision. In addition, 48 * Licensee must cause all Covered Code to which Licensee contributes to 49 * contain a file documenting the changes Licensee made to create that Covered 50 * Code and the date of any change. Licensee must include in that file the 51 * documentation of any changes made by any predecessor Licensee. Licensee 52 * must include a prominent statement that the modification is derived, 53 * directly or indirectly, from Original Intel Code. 54 * 55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56 * Redistribution of source code of any substantial portion of the Covered 57 * Code or modification without rights to further distribute source must 58 * include the following Disclaimer and Export Compliance provision in the 59 * documentation and/or other materials provided with distribution. In 60 * addition, Licensee may not authorize further sublicense of source of any 61 * portion of the Covered Code, and must include terms to the effect that the 62 * license from Licensee to its licensee is limited to the intellectual 63 * property embodied in the software Licensee provides to its licensee, and 64 * not to intellectual property embodied in modifications its licensee may 65 * make. 66 * 67 * 3.3. Redistribution of Executable. Redistribution in executable form of any 68 * substantial portion of the Covered Code or modification must reproduce the 69 * above Copyright Notice, and the following Disclaimer and Export Compliance 70 * provision in the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3.4. Intel retains all right, title, and interest in and to the Original 74 * Intel Code. 75 * 76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77 * Intel shall be used in advertising or otherwise to promote the sale, use or 78 * other dealings in products derived from or relating to the Covered Code 79 * without prior written authorization from Intel. 80 * 81 * 4. Disclaimer and Export Compliance 82 * 83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89 * PARTICULAR PURPOSE. 90 * 91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98 * LIMITED REMEDY. 99 * 100 * 4.3. Licensee shall not export, either directly or indirectly, any of this 101 * software or system incorporating such software without first obtaining any 102 * required license or other approval from the U. S. Department of Commerce or 103 * any other agency or department of the United States Government. In the 104 * event Licensee exports any such software from the United States or 105 * re-exports any such software from a foreign destination, Licensee shall 106 * ensure that the distribution and export/re-export of the software is in 107 * compliance with all laws, regulations, orders, or other restrictions of the 108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 109 * any of its subsidiaries will export/re-export any technical data, process, 110 * software, or service, directly or indirectly, to any country for which the 111 * United States government or any agency thereof requires an export license, 112 * other governmental approval, or letter of assurance, without first obtaining 113 * such license, approval or letter. 114 * 115 *****************************************************************************/ 116 117#define __NSACCESS_C__ 118 119#include "acpi.h" 120#include "amlcode.h" 121#include "acinterp.h" 122#include "acnamesp.h" 123#include "acdispat.h" 124 125 126#define _COMPONENT NAMESPACE 127 MODULE_NAME ("nsaccess") 128 129 130/******************************************************************************* 131 * 132 * FUNCTION: AcpiNsRootInitialize 133 * 134 * PARAMETERS: None 135 * 136 * RETURN: Status 137 * 138 * DESCRIPTION: Allocate and initialize the default root named objects 139 * 140 * MUTEX: Locks namespace for entire execution 141 * 142 ******************************************************************************/ 143 144ACPI_STATUS 145AcpiNsRootInitialize (void) 146{ 147 ACPI_STATUS Status = AE_OK; 148 PREDEFINED_NAMES *InitVal = NULL; 149 ACPI_NAMESPACE_NODE *NewNode; 150 ACPI_OPERAND_OBJECT *ObjDesc; 151 152 153 FUNCTION_TRACE ("NsRootInitialize"); 154 155 156 AcpiCmAcquireMutex (ACPI_MTX_NAMESPACE); 157 158 /* 159 * The global root ptr is initially NULL, so a non-NULL value indicates 160 * that AcpiNsRootInitialize() has already been called; just return. 161 */ 162 163 if (AcpiGbl_RootNode) 164 { 165 Status = AE_OK; 166 goto UnlockAndExit; 167 } 168 169 170 /* 171 * Tell the rest of the subsystem that the root is initialized 172 * (This is OK because the namespace is locked) 173 */ 174 175 AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct; 176 177 178 /* Enter the pre-defined names in the name table */ 179 180 DEBUG_PRINT (ACPI_INFO, 181 ("Entering predefined name table entries into namespace\n")); 182 183 for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++) 184 { 185 Status = AcpiNsLookup (NULL, InitVal->Name, 186 (OBJECT_TYPE_INTERNAL) InitVal->Type, 187 IMODE_LOAD_PASS2, NS_NO_UPSEARCH, 188 NULL, &NewNode); 189 190 if (ACPI_FAILURE (Status) || (!NewNode)) /* Must be on same line for code converter */ 191 { 192 DEBUG_PRINT (ACPI_ERROR, 193 ("Could not create predefined name %s, %s\n", 194 InitVal->Name, AcpiCmFormatException (Status))); 195 } 196 197 /* 198 * Name entered successfully. 199 * If entry in PreDefinedNames[] specifies an 200 * initial value, create the initial value. 201 */ 202 203 if (InitVal->Val) 204 { 205 /* 206 * Entry requests an initial value, allocate a 207 * descriptor for it. 208 */ 209 210 ObjDesc = AcpiCmCreateInternalObject ( 211 (OBJECT_TYPE_INTERNAL) InitVal->Type); 212 213 if (!ObjDesc) 214 { 215 Status = AE_NO_MEMORY; 216 goto UnlockAndExit; 217 } 218 219 /* 220 * Convert value string from table entry to 221 * internal representation. Only types actually 222 * used for initial values are implemented here. 223 */ 224 225 switch (InitVal->Type) 226 { 227 228 case ACPI_TYPE_NUMBER: 229 230 ObjDesc->Number.Value = 231 (ACPI_INTEGER) STRTOUL (InitVal->Val, NULL, 10); 232 break; 233 234 235 case ACPI_TYPE_STRING: 236 237 ObjDesc->String.Length = 238 (UINT16) STRLEN (InitVal->Val); 239 240 /* 241 * Allocate a buffer for the string. All 242 * String.Pointers must be allocated buffers! 243 * (makes deletion simpler) 244 */ 245 ObjDesc->String.Pointer = AcpiCmAllocate ( 246 (ObjDesc->String.Length + 1)); 247 if (!ObjDesc->String.Pointer) 248 { 249 AcpiCmRemoveReference (ObjDesc); 250 Status = AE_NO_MEMORY; 251 goto UnlockAndExit; 252 } 253 254 STRCPY (ObjDesc->String.Pointer, InitVal->Val); 255 break; 256 257 258 case ACPI_TYPE_MUTEX: 259 260 ObjDesc->Mutex.SyncLevel = 261 (UINT16) STRTOUL (InitVal->Val, NULL, 10); 262 263 if (STRCMP (InitVal->Name, "_GL_") == 0) 264 { 265 /* 266 * Create a counting semaphore for the 267 * global lock 268 */ 269 Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 270 1, &ObjDesc->Mutex.Semaphore); 271 272 if (ACPI_FAILURE (Status)) 273 { 274 goto UnlockAndExit; 275 } 276 /* 277 * We just created the mutex for the 278 * global lock, save it 279 */ 280 281 AcpiGbl_GlobalLockSemaphore = ObjDesc->Mutex.Semaphore; 282 } 283 284 else 285 { 286 /* Create a mutex */ 287 288 Status = AcpiOsCreateSemaphore (1, 1, 289 &ObjDesc->Mutex.Semaphore); 290 291 if (ACPI_FAILURE (Status)) 292 { 293 goto UnlockAndExit; 294 } 295 } 296 break; 297 298 299 default: 300 REPORT_ERROR (("Unsupported initial type value %X\n", 301 InitVal->Type)); 302 AcpiCmRemoveReference (ObjDesc); 303 ObjDesc = NULL; 304 continue; 305 } 306 307 /* Store pointer to value descriptor in the Node */ 308 309 AcpiNsAttachObject (NewNode, ObjDesc, 310 ObjDesc->Common.Type); 311 } 312 } 313 314 315UnlockAndExit: 316 AcpiCmReleaseMutex (ACPI_MTX_NAMESPACE); 317 return_ACPI_STATUS (Status); 318} 319 320 321/******************************************************************************* 322 * 323 * FUNCTION: AcpiNsLookup 324 * 325 * PARAMETERS: PrefixNode - Search scope if name is not fully qualified 326 * Pathname - Search pathname, in internal format 327 * (as represented in the AML stream) 328 * Type - Type associated with name 329 * InterpreterMode - IMODE_LOAD_PASS2 => add name if not found 330 * Flags - Flags describing the search restrictions 331 * WalkState - Current state of the walk 332 * ReturnNode - Where the Node is placed (if found 333 * or created successfully) 334 * 335 * RETURN: Status 336 * 337 * DESCRIPTION: Find or enter the passed name in the name space. 338 * Log an error if name not found in Exec mode. 339 * 340 * MUTEX: Assumes namespace is locked. 341 * 342 ******************************************************************************/ 343 344ACPI_STATUS 345AcpiNsLookup ( 346 ACPI_GENERIC_STATE *ScopeInfo, 347 NATIVE_CHAR *Pathname, 348 OBJECT_TYPE_INTERNAL Type, 349 OPERATING_MODE InterpreterMode, 350 UINT32 Flags, 351 ACPI_WALK_STATE *WalkState, 352 ACPI_NAMESPACE_NODE **ReturnNode) 353{ 354 ACPI_STATUS Status; 355 ACPI_NAMESPACE_NODE *PrefixNode; 356 ACPI_NAMESPACE_NODE *CurrentNode = NULL; 357 ACPI_NAMESPACE_NODE *ScopeToPush = NULL; 358 ACPI_NAMESPACE_NODE *ThisNode = NULL; 359 UINT32 NumSegments; 360 ACPI_NAME SimpleName; 361 BOOLEAN NullNamePath = FALSE; 362 OBJECT_TYPE_INTERNAL TypeToCheckFor; 363 OBJECT_TYPE_INTERNAL ThisSearchType; 364 365 DEBUG_ONLY_MEMBERS (UINT32 i) 366 367 368 FUNCTION_TRACE ("NsLookup"); 369 370 371 if (!ReturnNode) 372 { 373 return_ACPI_STATUS (AE_BAD_PARAMETER); 374 } 375 376 377 AcpiGbl_NsLookupCount++; 378 379 *ReturnNode = ENTRY_NOT_FOUND; 380 381 382 if (!AcpiGbl_RootNode) 383 { 384 return (AE_NO_NAMESPACE); 385 } 386 387 /* 388 * Get the prefix scope. 389 * A null scope means use the root scope 390 */ 391 392 if ((!ScopeInfo) || 393 (!ScopeInfo->Scope.Node)) 394 { 395 DEBUG_PRINT (TRACE_NAMES, 396 ("NsLookup: Null scope prefix, using root node (%p)\n", AcpiGbl_RootNode)); 397 398 PrefixNode = AcpiGbl_RootNode; 399 } 400 else 401 { 402 PrefixNode = ScopeInfo->Scope.Node; 403 } 404 405 406 /* 407 * This check is explicitly split provide relax the TypeToCheckFor 408 * conditions for BankFieldDefn. Originally, both BankFieldDefn and 409 * DefFieldDefn caused TypeToCheckFor to be set to ACPI_TYPE_REGION, 410 * but the BankFieldDefn may also check for a Field definition as well 411 * as an OperationRegion. 412 */ 413 414 if (INTERNAL_TYPE_DEF_FIELD_DEFN == Type) 415 { 416 /* DefFieldDefn defines fields in a Region */ 417 418 TypeToCheckFor = ACPI_TYPE_REGION; 419 } 420 421 else if (INTERNAL_TYPE_BANK_FIELD_DEFN == Type) 422 { 423 /* BankFieldDefn defines data fields in a Field Object */ 424 425 TypeToCheckFor = ACPI_TYPE_ANY; 426 } 427 428 else 429 { 430 TypeToCheckFor = Type; 431 } 432 433 434 /* TBD: [Restructure] - Move the pathname stuff into a new procedure */ 435 436 /* Examine the name pointer */ 437 438 if (!Pathname) 439 { 440 /* 8-12-98 ASL Grammar Update supports null NamePath */ 441 442 NullNamePath = TRUE; 443 NumSegments = 0; 444 ThisNode = AcpiGbl_RootNode; 445 446 DEBUG_PRINT (TRACE_NAMES, 447 ("NsLookup: Null Pathname (Zero segments), Flags=%x\n", Flags)); 448 } 449 450 else 451 { 452 /* 453 * Valid name pointer (Internal name format) 454 * 455 * Check for prefixes. As represented in the AML stream, a 456 * Pathname consists of an optional scope prefix followed by 457 * a segment part. 458 * 459 * If present, the scope prefix is either a RootPrefix (in 460 * which case the name is fully qualified), or zero or more 461 * ParentPrefixes (in which case the name's scope is relative 462 * to the current scope). 463 * 464 * The segment part consists of either: 465 * - A single 4-byte name segment, or 466 * - A DualNamePrefix followed by two 4-byte name segments, or 467 * - A MultiNamePrefixOp, followed by a byte indicating the 468 * number of segments and the segments themselves. 469 */ 470 471 if (*Pathname == AML_ROOT_PREFIX) 472 { 473 /* Pathname is fully qualified, look in root name table */ 474 475 CurrentNode = AcpiGbl_RootNode; 476 477 /* point to segment part */ 478 479 Pathname++; 480 481 DEBUG_PRINT (TRACE_NAMES, 482 ("NsLookup: Searching from root [%p]\n", 483 CurrentNode)); 484 485 /* Direct reference to root, "\" */ 486 487 if (!(*Pathname)) 488 { 489 ThisNode = AcpiGbl_RootNode; 490 goto CheckForNewScopeAndExit; 491 } 492 } 493 494 else 495 { 496 /* Pathname is relative to current scope, start there */ 497 498 CurrentNode = PrefixNode; 499 500 DEBUG_PRINT (TRACE_NAMES, 501 ("NsLookup: Searching relative to pfx scope [%p]\n", 502 PrefixNode)); 503 504 /* 505 * Handle up-prefix (carat). More than one prefix 506 * is supported 507 */ 508 509 while (*Pathname == AML_PARENT_PREFIX) 510 { 511 /* Point to segment part or next ParentPrefix */ 512 513 Pathname++; 514 515 /* Backup to the parent's scope */ 516 517 ThisNode = AcpiNsGetParentObject (CurrentNode); 518 if (!ThisNode) 519 { 520 /* Current scope has no parent scope */ 521 522 REPORT_ERROR (("Too many parent prefixes (^) - reached root\n")); 523 return_ACPI_STATUS (AE_NOT_FOUND); 524 } 525 526 CurrentNode = ThisNode; 527 } 528 } 529 530 531 /* 532 * Examine the name prefix opcode, if any, 533 * to determine the number of segments 534 */ 535 536 if (*Pathname == AML_DUAL_NAME_PREFIX) 537 { 538 NumSegments = 2; 539 540 /* point to first segment */ 541 542 Pathname++; 543 544 DEBUG_PRINT (TRACE_NAMES, 545 ("NsLookup: Dual Pathname (2 segments, Flags=%X)\n", Flags)); 546 } 547 548 else if (*Pathname == AML_MULTI_NAME_PREFIX_OP) 549 { 550 NumSegments = (UINT32)* (UINT8 *) ++Pathname; 551 552 /* point to first segment */ 553 554 Pathname++; 555 556 DEBUG_PRINT (TRACE_NAMES, 557 ("NsLookup: Multi Pathname (%d Segments, Flags=%X) \n", 558 NumSegments, Flags)); 559 } 560 561 else 562 { 563 /* 564 * No Dual or Multi prefix, hence there is only one 565 * segment and Pathname is already pointing to it. 566 */ 567 NumSegments = 1; 568 569 DEBUG_PRINT (TRACE_NAMES, 570 ("NsLookup: Simple Pathname (1 segment, Flags=%X)\n", Flags)); 571 } 572 573#ifdef ACPI_DEBUG 574 575 /* TBD: [Restructure] Make this a procedure */ 576 577 /* Debug only: print the entire name that we are about to lookup */ 578 579 DEBUG_PRINT (TRACE_NAMES, ("NsLookup: [")); 580 581 for (i = 0; i < NumSegments; i++) 582 { 583 DEBUG_PRINT_RAW (TRACE_NAMES, ("%4.4s/", &Pathname[i * 4])); 584 } 585 DEBUG_PRINT_RAW (TRACE_NAMES, ("]\n")); 586#endif 587 } 588 589 590 /* 591 * Search namespace for each segment of the name. 592 * Loop through and verify/add each name segment. 593 */ 594 595 596 while (NumSegments-- && CurrentNode) 597 { 598 /* 599 * Search for the current name segment under the current 600 * named object. The Type is significant only at the last (topmost) 601 * level. (We don't care about the types along the path, only 602 * the type of the final target object.) 603 */ 604 ThisSearchType = ACPI_TYPE_ANY; 605 if (!NumSegments) 606 { 607 ThisSearchType = Type; 608 } 609 610 /* Pluck one ACPI name from the front of the pathname */ 611 612 MOVE_UNALIGNED32_TO_32 (&SimpleName, Pathname); 613 614 /* Try to find the ACPI name */ 615 616 Status = AcpiNsSearchAndEnter (SimpleName, WalkState, 617 CurrentNode, InterpreterMode, 618 ThisSearchType, Flags, 619 &ThisNode); 620 621 if (ACPI_FAILURE (Status)) 622 { 623 if (Status == AE_NOT_FOUND) 624 { 625 /* Name not found in ACPI namespace */ 626 627 DEBUG_PRINT (TRACE_NAMES, 628 ("NsLookup: Name [%4.4s] not found in scope %X\n", 629 &SimpleName, CurrentNode)); 630 } 631 632 return_ACPI_STATUS (Status); 633 } 634 635 636 /* 637 * If 1) This is the last segment (NumSegments == 0) 638 * 2) and looking for a specific type 639 * (Not checking for TYPE_ANY) 640 * 3) Which is not an alias 641 * 4) which is not a local type (TYPE_DEF_ANY) 642 * 5) which is not a local type (TYPE_SCOPE) 643 * 6) which is not a local type (TYPE_INDEX_FIELD_DEFN) 644 * 7) and type of object is known (not TYPE_ANY) 645 * 8) and object does not match request 646 * 647 * Then we have a type mismatch. Just warn and ignore it. 648 */ 649 if ((NumSegments == 0) && 650 (TypeToCheckFor != ACPI_TYPE_ANY) && 651 (TypeToCheckFor != INTERNAL_TYPE_ALIAS) && 652 (TypeToCheckFor != INTERNAL_TYPE_DEF_ANY) && 653 (TypeToCheckFor != INTERNAL_TYPE_SCOPE) && 654 (TypeToCheckFor != INTERNAL_TYPE_INDEX_FIELD_DEFN) && 655 (ThisNode->Type != ACPI_TYPE_ANY) && 656 (ThisNode->Type != TypeToCheckFor)) 657 { 658 /* Complain about a type mismatch */ 659 660 REPORT_WARNING ( 661 ("NsLookup: %4.4s, type %X, checking for type %X\n", 662 &SimpleName, ThisNode->Type, TypeToCheckFor)); 663 } 664 665 /* 666 * If this is the last name segment and we are not looking for a 667 * specific type, but the type of found object is known, use that type 668 * to see if it opens a scope. 669 */ 670 671 if ((0 == NumSegments) && (ACPI_TYPE_ANY == Type)) 672 { 673 Type = ThisNode->Type; 674 } 675 676 if ((NumSegments || AcpiNsOpensScope (Type)) && 677 (ThisNode->Child == NULL)) 678 { 679 /* 680 * More segments or the type implies enclosed scope, 681 * and the next scope has not been allocated. 682 */ 683 684 DEBUG_PRINT (ACPI_INFO, 685 ("NsLookup: Load mode=%X ThisNode=%X\n", 686 InterpreterMode, ThisNode)); 687 } 688 689 CurrentNode = ThisNode; 690 691 /* point to next name segment */ 692 693 Pathname += ACPI_NAME_SIZE; 694 } 695 696 697 /* 698 * Always check if we need to open a new scope 699 */ 700 701CheckForNewScopeAndExit: 702 703 if (!(Flags & NS_DONT_OPEN_SCOPE) && (WalkState)) 704 { 705 /* 706 * If entry is a type which opens a scope, 707 * push the new scope on the scope stack. 708 */ 709 710 if (AcpiNsOpensScope (TypeToCheckFor)) 711 { 712 /* 8-12-98 ASL Grammar Update supports null NamePath */ 713 714 if (NullNamePath) 715 { 716 /* TBD: [Investigate] - is this the correct thing to do? */ 717 718 ScopeToPush = NULL; 719 } 720 else 721 { 722 ScopeToPush = ThisNode; 723 } 724 725 Status = AcpiDsScopeStackPush (ScopeToPush, Type, 726 WalkState); 727 if (ACPI_FAILURE (Status)) 728 { 729 return_ACPI_STATUS (Status); 730 } 731 732 DEBUG_PRINT (ACPI_INFO, 733 ("NsLookup: Set global scope to %p\n", ScopeToPush)); 734 } 735 } 736 737 *ReturnNode = ThisNode; 738 return_ACPI_STATUS (AE_OK); 739} 740 741