nsaccess.c revision 71867
1/******************************************************************************* 2 * 3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace 4 * $Revision: 119 $ 5 * 6 ******************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999, 2000, 2001, 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_INTEGER: 229 230 ObjDesc->Integer.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 UINT32 LocalFlags = Flags & ~NS_ERROR_IF_FOUND; 365 366 DEBUG_EXEC (UINT32 i;) 367 368 369 FUNCTION_TRACE ("NsLookup"); 370 371 372 if (!ReturnNode) 373 { 374 return_ACPI_STATUS (AE_BAD_PARAMETER); 375 } 376 377 378 AcpiGbl_NsLookupCount++; 379 380 *ReturnNode = ENTRY_NOT_FOUND; 381 382 383 if (!AcpiGbl_RootNode) 384 { 385 return (AE_NO_NAMESPACE); 386 } 387 388 /* 389 * Get the prefix scope. 390 * A null scope means use the root scope 391 */ 392 393 if ((!ScopeInfo) || 394 (!ScopeInfo->Scope.Node)) 395 { 396 DEBUG_PRINT (TRACE_NAMES, 397 ("NsLookup: Null scope prefix, using root node (%p)\n", AcpiGbl_RootNode)); 398 399 PrefixNode = AcpiGbl_RootNode; 400 } 401 else 402 { 403 PrefixNode = ScopeInfo->Scope.Node; 404 } 405 406 407 /* 408 * This check is explicitly split provide relax the TypeToCheckFor 409 * conditions for BankFieldDefn. Originally, both BankFieldDefn and 410 * DefFieldDefn caused TypeToCheckFor to be set to ACPI_TYPE_REGION, 411 * but the BankFieldDefn may also check for a Field definition as well 412 * as an OperationRegion. 413 */ 414 415 if (INTERNAL_TYPE_DEF_FIELD_DEFN == Type) 416 { 417 /* DefFieldDefn defines fields in a Region */ 418 419 TypeToCheckFor = ACPI_TYPE_REGION; 420 } 421 422 else if (INTERNAL_TYPE_BANK_FIELD_DEFN == Type) 423 { 424 /* BankFieldDefn defines data fields in a Field Object */ 425 426 TypeToCheckFor = ACPI_TYPE_ANY; 427 } 428 429 else 430 { 431 TypeToCheckFor = Type; 432 } 433 434 435 /* TBD: [Restructure] - Move the pathname stuff into a new procedure */ 436 437 /* Examine the name pointer */ 438 439 if (!Pathname) 440 { 441 /* 8-12-98 ASL Grammar Update supports null NamePath */ 442 443 NullNamePath = TRUE; 444 NumSegments = 0; 445 ThisNode = AcpiGbl_RootNode; 446 447 DEBUG_PRINT (TRACE_NAMES, 448 ("NsLookup: Null Pathname (Zero segments), Flags=%x\n", Flags)); 449 } 450 451 else 452 { 453 /* 454 * Valid name pointer (Internal name format) 455 * 456 * Check for prefixes. As represented in the AML stream, a 457 * Pathname consists of an optional scope prefix followed by 458 * a segment part. 459 * 460 * If present, the scope prefix is either a RootPrefix (in 461 * which case the name is fully qualified), or zero or more 462 * ParentPrefixes (in which case the name's scope is relative 463 * to the current scope). 464 * 465 * The segment part consists of either: 466 * - A single 4-byte name segment, or 467 * - A DualNamePrefix followed by two 4-byte name segments, or 468 * - A MultiNamePrefixOp, followed by a byte indicating the 469 * number of segments and the segments themselves. 470 */ 471 472 if (*Pathname == AML_ROOT_PREFIX) 473 { 474 /* Pathname is fully qualified, look in root name table */ 475 476 CurrentNode = AcpiGbl_RootNode; 477 478 /* point to segment part */ 479 480 Pathname++; 481 482 DEBUG_PRINT (TRACE_NAMES, 483 ("NsLookup: Searching from root [%p]\n", 484 CurrentNode)); 485 486 /* Direct reference to root, "\" */ 487 488 if (!(*Pathname)) 489 { 490 ThisNode = AcpiGbl_RootNode; 491 goto CheckForNewScopeAndExit; 492 } 493 } 494 495 else 496 { 497 /* Pathname is relative to current scope, start there */ 498 499 CurrentNode = PrefixNode; 500 501 DEBUG_PRINT (TRACE_NAMES, 502 ("NsLookup: Searching relative to pfx scope [%p]\n", 503 PrefixNode)); 504 505 /* 506 * Handle up-prefix (carat). More than one prefix 507 * is supported 508 */ 509 510 while (*Pathname == AML_PARENT_PREFIX) 511 { 512 /* Point to segment part or next ParentPrefix */ 513 514 Pathname++; 515 516 /* Backup to the parent's scope */ 517 518 ThisNode = AcpiNsGetParentObject (CurrentNode); 519 if (!ThisNode) 520 { 521 /* Current scope has no parent scope */ 522 523 REPORT_ERROR (("Too many parent prefixes (^) - reached root\n")); 524 return_ACPI_STATUS (AE_NOT_FOUND); 525 } 526 527 CurrentNode = ThisNode; 528 } 529 } 530 531 532 /* 533 * Examine the name prefix opcode, if any, 534 * to determine the number of segments 535 */ 536 537 if (*Pathname == AML_DUAL_NAME_PREFIX) 538 { 539 NumSegments = 2; 540 541 /* point to first segment */ 542 543 Pathname++; 544 545 DEBUG_PRINT (TRACE_NAMES, 546 ("NsLookup: Dual Pathname (2 segments, Flags=%X)\n", Flags)); 547 } 548 549 else if (*Pathname == AML_MULTI_NAME_PREFIX_OP) 550 { 551 NumSegments = (UINT32)* (UINT8 *) ++Pathname; 552 553 /* point to first segment */ 554 555 Pathname++; 556 557 DEBUG_PRINT (TRACE_NAMES, 558 ("NsLookup: Multi Pathname (%d Segments, Flags=%X) \n", 559 NumSegments, Flags)); 560 } 561 562 else 563 { 564 /* 565 * No Dual or Multi prefix, hence there is only one 566 * segment and Pathname is already pointing to it. 567 */ 568 NumSegments = 1; 569 570 DEBUG_PRINT (TRACE_NAMES, 571 ("NsLookup: Simple Pathname (1 segment, Flags=%X)\n", Flags)); 572 } 573 574#ifdef ACPI_DEBUG 575 576 /* TBD: [Restructure] Make this a procedure */ 577 578 /* Debug only: print the entire name that we are about to lookup */ 579 580 DEBUG_PRINT (TRACE_NAMES, ("NsLookup: [")); 581 582 for (i = 0; i < NumSegments; i++) 583 { 584 DEBUG_PRINT_RAW (TRACE_NAMES, ("%4.4s/", &Pathname[i * 4])); 585 } 586 DEBUG_PRINT_RAW (TRACE_NAMES, ("]\n")); 587#endif 588 } 589 590 591 /* 592 * Search namespace for each segment of the name. 593 * Loop through and verify/add each name segment. 594 */ 595 596 597 while (NumSegments-- && CurrentNode) 598 { 599 /* 600 * Search for the current name segment under the current 601 * named object. The Type is significant only at the last (topmost) 602 * level. (We don't care about the types along the path, only 603 * the type of the final target object.) 604 */ 605 ThisSearchType = ACPI_TYPE_ANY; 606 if (!NumSegments) 607 { 608 ThisSearchType = Type; 609 LocalFlags = Flags; 610 } 611 612 /* Pluck one ACPI name from the front of the pathname */ 613 614 MOVE_UNALIGNED32_TO_32 (&SimpleName, Pathname); 615 616 /* Try to find the ACPI name */ 617 618 Status = AcpiNsSearchAndEnter (SimpleName, WalkState, 619 CurrentNode, InterpreterMode, 620 ThisSearchType, LocalFlags, 621 &ThisNode); 622 623 if (ACPI_FAILURE (Status)) 624 { 625 if (Status == AE_NOT_FOUND) 626 { 627 /* Name not found in ACPI namespace */ 628 629 DEBUG_PRINT (TRACE_NAMES, 630 ("NsLookup: Name [%4.4s] not found in scope %X\n", 631 &SimpleName, CurrentNode)); 632 } 633 634 return_ACPI_STATUS (Status); 635 } 636 637 638 /* 639 * If 1) This is the last segment (NumSegments == 0) 640 * 2) and looking for a specific type 641 * (Not checking for TYPE_ANY) 642 * 3) Which is not an alias 643 * 4) which is not a local type (TYPE_DEF_ANY) 644 * 5) which is not a local type (TYPE_SCOPE) 645 * 6) which is not a local type (TYPE_INDEX_FIELD_DEFN) 646 * 7) and type of object is known (not TYPE_ANY) 647 * 8) and object does not match request 648 * 649 * Then we have a type mismatch. Just warn and ignore it. 650 */ 651 if ((NumSegments == 0) && 652 (TypeToCheckFor != ACPI_TYPE_ANY) && 653 (TypeToCheckFor != INTERNAL_TYPE_ALIAS) && 654 (TypeToCheckFor != INTERNAL_TYPE_DEF_ANY) && 655 (TypeToCheckFor != INTERNAL_TYPE_SCOPE) && 656 (TypeToCheckFor != INTERNAL_TYPE_INDEX_FIELD_DEFN) && 657 (ThisNode->Type != ACPI_TYPE_ANY) && 658 (ThisNode->Type != TypeToCheckFor)) 659 { 660 /* Complain about a type mismatch */ 661 662 REPORT_WARNING ( 663 ("NsLookup: %4.4s, type %X, checking for type %X\n", 664 &SimpleName, ThisNode->Type, TypeToCheckFor)); 665 } 666 667 /* 668 * If this is the last name segment and we are not looking for a 669 * specific type, but the type of found object is known, use that type 670 * to see if it opens a scope. 671 */ 672 673 if ((0 == NumSegments) && (ACPI_TYPE_ANY == Type)) 674 { 675 Type = ThisNode->Type; 676 } 677 678 if ((NumSegments || AcpiNsOpensScope (Type)) && 679 (ThisNode->Child == NULL)) 680 { 681 /* 682 * More segments or the type implies enclosed scope, 683 * and the next scope has not been allocated. 684 */ 685 686 DEBUG_PRINT (ACPI_INFO, 687 ("NsLookup: Load mode=%X ThisNode=%X\n", 688 InterpreterMode, ThisNode)); 689 } 690 691 CurrentNode = ThisNode; 692 693 /* point to next name segment */ 694 695 Pathname += ACPI_NAME_SIZE; 696 } 697 698 699 /* 700 * Always check if we need to open a new scope 701 */ 702 703CheckForNewScopeAndExit: 704 705 if (!(Flags & NS_DONT_OPEN_SCOPE) && (WalkState)) 706 { 707 /* 708 * If entry is a type which opens a scope, 709 * push the new scope on the scope stack. 710 */ 711 712 if (AcpiNsOpensScope (TypeToCheckFor)) 713 { 714 /* 8-12-98 ASL Grammar Update supports null NamePath */ 715 716 if (NullNamePath) 717 { 718 /* TBD: [Investigate] - is this the correct thing to do? */ 719 720 ScopeToPush = NULL; 721 } 722 else 723 { 724 ScopeToPush = ThisNode; 725 } 726 727 Status = AcpiDsScopeStackPush (ScopeToPush, Type, 728 WalkState); 729 if (ACPI_FAILURE (Status)) 730 { 731 return_ACPI_STATUS (Status); 732 } 733 734 DEBUG_PRINT (ACPI_INFO, 735 ("NsLookup: Set global scope to %p\n", ScopeToPush)); 736 } 737 } 738 739 *ReturnNode = ThisNode; 740 return_ACPI_STATUS (AE_OK); 741} 742 743