1 /******************************************************************************* 2 * 3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace 4 * 5 ******************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2020, 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 "amlcode.h" 47 #include "acnamesp.h" 48 #include "acdispat.h" 49 50 #ifdef ACPI_ASL_COMPILER 51 #include "acdisasm.h" 52 #endif 53 54 #define _COMPONENT ACPI_NAMESPACE 55 ACPI_MODULE_NAME ("nsaccess") 56 57 58 /******************************************************************************* 59 * 60 * FUNCTION: AcpiNsRootInitialize 61 * 62 * PARAMETERS: None 63 * 64 * RETURN: Status 65 * 66 * DESCRIPTION: Allocate and initialize the default root named objects 67 * 68 * MUTEX: Locks namespace for entire execution 69 * 70 ******************************************************************************/ 71 72 ACPI_STATUS 73 AcpiNsRootInitialize ( 74 void) 75 { 76 ACPI_STATUS Status; 77 const ACPI_PREDEFINED_NAMES *InitVal = NULL; 78 ACPI_NAMESPACE_NODE *NewNode; 79 ACPI_NAMESPACE_NODE *PrevNode = NULL; 80 ACPI_OPERAND_OBJECT *ObjDesc; 81 ACPI_STRING Val = NULL; 82 83 84 ACPI_FUNCTION_TRACE (NsRootInitialize); 85 86 87 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 88 if (ACPI_FAILURE (Status)) 89 { 90 return_ACPI_STATUS (Status); 91 } 92 93 /* 94 * The global root ptr is initially NULL, so a non-NULL value indicates 95 * that AcpiNsRootInitialize() has already been called; just return. 96 */ 97 if (AcpiGbl_RootNode) 98 { 99 Status = AE_OK; 100 goto UnlockAndExit; 101 } 102 103 /* 104 * Tell the rest of the subsystem that the root is initialized 105 * (This is OK because the namespace is locked) 106 */ 107 AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct; 108 109 /* Enter the predefined names in the name table */ 110 111 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 112 "Entering predefined entries into namespace\n")); 113 114 /* 115 * Create the initial (default) namespace. 116 * This namespace looks like something similar to this: 117 * 118 * ACPI Namespace (from Namespace Root): 119 * 0 _GPE Scope 00203160 00 120 * 0 _PR_ Scope 002031D0 00 121 * 0 _SB_ Device 00203240 00 Notify Object: 0020ADD8 122 * 0 _SI_ Scope 002032B0 00 123 * 0 _TZ_ Device 00203320 00 124 * 0 _REV Integer 00203390 00 = 0000000000000002 125 * 0 _OS_ String 00203488 00 Len 14 "Microsoft Windows NT" 126 * 0 _GL_ Mutex 00203580 00 Object 002035F0 127 * 0 _OSI Method 00203678 00 Args 1 Len 0000 Aml 00000000 128 */ 129 for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++) 130 { 131 Status = AE_OK; 132 133 /* _OSI is optional for now, will be permanent later */ 134 135 if (!strcmp (InitVal->Name, "_OSI") && !AcpiGbl_CreateOsiMethod) 136 { 137 continue; 138 } 139 140 /* 141 * Create, init, and link the new predefined name 142 * Note: No need to use AcpiNsLookup here because all the 143 * predefined names are at the root level. It is much easier to 144 * just create and link the new node(s) here. 145 */ 146 NewNode = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_NAMESPACE_NODE)); 147 if (!NewNode) 148 { 149 Status = AE_NO_MEMORY; 150 goto UnlockAndExit; 151 } 152 153 ACPI_COPY_NAMESEG (NewNode->Name.Ascii, InitVal->Name); 154 NewNode->DescriptorType = ACPI_DESC_TYPE_NAMED; 155 NewNode->Type = InitVal->Type; 156 157 if (!PrevNode) 158 { 159 AcpiGbl_RootNodeStruct.Child = NewNode; 160 } 161 else 162 { 163 PrevNode->Peer = NewNode; 164 } 165 166 NewNode->Parent = &AcpiGbl_RootNodeStruct; 167 PrevNode = NewNode; 168 169 /* 170 * Name entered successfully. If entry in PreDefinedNames[] specifies 171 * an initial value, create the initial value. 172 */ 173 if (InitVal->Val) 174 { 175 Status = AcpiOsPredefinedOverride (InitVal, &Val); 176 if (ACPI_FAILURE (Status)) 177 { 178 ACPI_ERROR ((AE_INFO, 179 "Could not override predefined %s", 180 InitVal->Name)); 181 } 182 183 if (!Val) 184 { 185 Val = InitVal->Val; 186 } 187 188 /* 189 * Entry requests an initial value, allocate a 190 * descriptor for it. 191 */ 192 ObjDesc = AcpiUtCreateInternalObject (InitVal->Type); 193 if (!ObjDesc) 194 { 195 Status = AE_NO_MEMORY; 196 goto UnlockAndExit; 197 } 198 199 /* 200 * Convert value string from table entry to 201 * internal representation. Only types actually 202 * used for initial values are implemented here. 203 */ 204 switch (InitVal->Type) 205 { 206 case ACPI_TYPE_METHOD: 207 208 ObjDesc->Method.ParamCount = (UINT8) ACPI_TO_INTEGER (Val); 209 ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID; 210 211 #if defined (ACPI_ASL_COMPILER) 212 213 /* Save the parameter count for the iASL compiler */ 214 215 NewNode->Value = ObjDesc->Method.ParamCount; 216 #else 217 /* Mark this as a very SPECIAL method (_OSI) */ 218 219 ObjDesc->Method.InfoFlags = ACPI_METHOD_INTERNAL_ONLY; 220 ObjDesc->Method.Dispatch.Implementation = AcpiUtOsiImplementation; 221 #endif 222 break; 223 224 case ACPI_TYPE_INTEGER: 225 226 ObjDesc->Integer.Value = ACPI_TO_INTEGER (Val); 227 break; 228 229 case ACPI_TYPE_STRING: 230 231 /* Build an object around the static string */ 232 233 ObjDesc->String.Length = (UINT32) strlen (Val); 234 ObjDesc->String.Pointer = Val; 235 ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER; 236 break; 237 238 case ACPI_TYPE_MUTEX: 239 240 ObjDesc->Mutex.Node = NewNode; 241 ObjDesc->Mutex.SyncLevel = (UINT8) (ACPI_TO_INTEGER (Val) - 1); 242 243 /* Create a mutex */ 244 245 Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex); 246 if (ACPI_FAILURE (Status)) 247 { 248 AcpiUtRemoveReference (ObjDesc); 249 goto UnlockAndExit; 250 } 251 252 /* Special case for ACPI Global Lock */ 253 254 if (strcmp (InitVal->Name, "_GL_") == 0) 255 { 256 AcpiGbl_GlobalLockMutex = ObjDesc; 257 258 /* Create additional counting semaphore for global lock */ 259 260 Status = AcpiOsCreateSemaphore ( 261 1, 0, &AcpiGbl_GlobalLockSemaphore); 262 if (ACPI_FAILURE (Status)) 263 { 264 AcpiUtRemoveReference (ObjDesc); 265 goto UnlockAndExit; 266 } 267 } 268 break; 269 270 default: 271 272 ACPI_ERROR ((AE_INFO, "Unsupported initial type value 0x%X", 273 InitVal->Type)); 274 AcpiUtRemoveReference (ObjDesc); 275 ObjDesc = NULL; 276 continue; 277 } 278 279 /* Store pointer to value descriptor in the Node */ 280 281 Status = AcpiNsAttachObject (NewNode, ObjDesc, 282 ObjDesc->Common.Type); 283 284 /* Remove local reference to the object */ 285 286 AcpiUtRemoveReference (ObjDesc); 287 } 288 } 289 290 UnlockAndExit: 291 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 292 293 /* Save a handle to "_GPE", it is always present */ 294 295 if (ACPI_SUCCESS (Status)) 296 { 297 Status = AcpiNsGetNode (NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH, 298 &AcpiGbl_FadtGpeDevice); 299 } 300 301 return_ACPI_STATUS (Status); 302 } 303 304 305 /******************************************************************************* 306 * 307 * FUNCTION: AcpiNsLookup 308 * 309 * PARAMETERS: ScopeInfo - Current scope info block 310 * Pathname - Search pathname, in internal format 311 * (as represented in the AML stream) 312 * Type - Type associated with name 313 * InterpreterMode - IMODE_LOAD_PASS2 => add name if not found 314 * Flags - Flags describing the search restrictions 315 * WalkState - Current state of the walk 316 * ReturnNode - Where the Node is placed (if found 317 * or created successfully) 318 * 319 * RETURN: Status 320 * 321 * DESCRIPTION: Find or enter the passed name in the name space. 322 * Log an error if name not found in Exec mode. 323 * 324 * MUTEX: Assumes namespace is locked. 325 * 326 ******************************************************************************/ 327 328 ACPI_STATUS 329 AcpiNsLookup ( 330 ACPI_GENERIC_STATE *ScopeInfo, 331 char *Pathname, 332 ACPI_OBJECT_TYPE Type, 333 ACPI_INTERPRETER_MODE InterpreterMode, 334 UINT32 Flags, 335 ACPI_WALK_STATE *WalkState, 336 ACPI_NAMESPACE_NODE **ReturnNode) 337 { 338 ACPI_STATUS Status; 339 char *Path = Pathname; 340 char *ExternalPath; 341 ACPI_NAMESPACE_NODE *PrefixNode; 342 ACPI_NAMESPACE_NODE *CurrentNode = NULL; 343 ACPI_NAMESPACE_NODE *ThisNode = NULL; 344 UINT32 NumSegments; 345 UINT32 NumCarats; 346 ACPI_NAME SimpleName; 347 ACPI_OBJECT_TYPE TypeToCheckFor; 348 ACPI_OBJECT_TYPE ThisSearchType; 349 UINT32 SearchParentFlag = ACPI_NS_SEARCH_PARENT; 350 UINT32 LocalFlags; 351 ACPI_INTERPRETER_MODE LocalInterpreterMode; 352 353 354 ACPI_FUNCTION_TRACE (NsLookup); 355 356 357 if (!ReturnNode) 358 { 359 return_ACPI_STATUS (AE_BAD_PARAMETER); 360 } 361 362 LocalFlags = Flags & 363 ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND | 364 ACPI_NS_SEARCH_PARENT); 365 *ReturnNode = ACPI_ENTRY_NOT_FOUND; 366 AcpiGbl_NsLookupCount++; 367 368 if (!AcpiGbl_RootNode) 369 { 370 return_ACPI_STATUS (AE_NO_NAMESPACE); 371 } 372 373 /* Get the prefix scope. A null scope means use the root scope */ 374 375 if ((!ScopeInfo) || 376 (!ScopeInfo->Scope.Node)) 377 { 378 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 379 "Null scope prefix, using root node (%p)\n", 380 AcpiGbl_RootNode)); 381 382 PrefixNode = AcpiGbl_RootNode; 383 } 384 else 385 { 386 PrefixNode = ScopeInfo->Scope.Node; 387 if (ACPI_GET_DESCRIPTOR_TYPE (PrefixNode) != ACPI_DESC_TYPE_NAMED) 388 { 389 ACPI_ERROR ((AE_INFO, "%p is not a namespace node [%s]", 390 PrefixNode, AcpiUtGetDescriptorName (PrefixNode))); 391 return_ACPI_STATUS (AE_AML_INTERNAL); 392 } 393 394 if (!(Flags & ACPI_NS_PREFIX_IS_SCOPE)) 395 { 396 /* 397 * This node might not be a actual "scope" node (such as a 398 * Device/Method, etc.) It could be a Package or other object 399 * node. Backup up the tree to find the containing scope node. 400 */ 401 while (!AcpiNsOpensScope (PrefixNode->Type) && 402 PrefixNode->Type != ACPI_TYPE_ANY) 403 { 404 PrefixNode = PrefixNode->Parent; 405 } 406 } 407 } 408 409 /* Save type. TBD: may be no longer necessary */ 410 411 TypeToCheckFor = Type; 412 413 /* 414 * Begin examination of the actual pathname 415 */ 416 if (!Pathname) 417 { 418 /* A Null NamePath is allowed and refers to the root */ 419 420 NumSegments = 0; 421 ThisNode = AcpiGbl_RootNode; 422 Path = ""; 423 424 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 425 "Null Pathname (Zero segments), Flags=%X\n", Flags)); 426 } 427 else 428 { 429 /* 430 * Name pointer is valid (and must be in internal name format) 431 * 432 * Check for scope prefixes: 433 * 434 * As represented in the AML stream, a namepath consists of an 435 * optional scope prefix followed by a name segment part. 436 * 437 * If present, the scope prefix is either a Root Prefix (in 438 * which case the name is fully qualified), or one or more 439 * Parent Prefixes (in which case the name's scope is relative 440 * to the current scope). 441 */ 442 if (*Path == (UINT8) AML_ROOT_PREFIX) 443 { 444 /* Pathname is fully qualified, start from the root */ 445 446 ThisNode = AcpiGbl_RootNode; 447 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 448 449 /* Point to name segment part */ 450 451 Path++; 452 453 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 454 "Path is absolute from root [%p]\n", ThisNode)); 455 } 456 else 457 { 458 /* Pathname is relative to current scope, start there */ 459 460 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 461 "Searching relative to prefix scope [%4.4s] (%p)\n", 462 AcpiUtGetNodeName (PrefixNode), PrefixNode)); 463 464 /* 465 * Handle multiple Parent Prefixes (carat) by just getting 466 * the parent node for each prefix instance. 467 */ 468 ThisNode = PrefixNode; 469 NumCarats = 0; 470 while (*Path == (UINT8) AML_PARENT_PREFIX) 471 { 472 /* Name is fully qualified, no search rules apply */ 473 474 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 475 476 /* 477 * Point past this prefix to the name segment 478 * part or the next Parent Prefix 479 */ 480 Path++; 481 482 /* Backup to the parent node */ 483 484 NumCarats++; 485 ThisNode = ThisNode->Parent; 486 if (!ThisNode) 487 { 488 /* 489 * Current scope has no parent scope. Externalize 490 * the internal path for error message. 491 */ 492 Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, Pathname, 493 NULL, &ExternalPath); 494 if (ACPI_SUCCESS (Status)) 495 { 496 ACPI_ERROR ((AE_INFO, 497 "%s: Path has too many parent prefixes (^)", 498 ExternalPath)); 499 500 ACPI_FREE (ExternalPath); 501 } 502 503 return_ACPI_STATUS (AE_NOT_FOUND); 504 } 505 } 506 507 if (SearchParentFlag == ACPI_NS_NO_UPSEARCH) 508 { 509 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 510 "Search scope is [%4.4s], path has %u carat(s)\n", 511 AcpiUtGetNodeName (ThisNode), NumCarats)); 512 } 513 } 514 515 /* 516 * Determine the number of ACPI name segments in this pathname. 517 * 518 * The segment part consists of either: 519 * - A Null name segment (0) 520 * - A DualNamePrefix followed by two 4-byte name segments 521 * - A MultiNamePrefix followed by a byte indicating the 522 * number of segments and the segments themselves. 523 * - A single 4-byte name segment 524 * 525 * Examine the name prefix opcode, if any, to determine the number of 526 * segments. 527 */ 528 switch (*Path) 529 { 530 case 0: 531 /* 532 * Null name after a root or parent prefixes. We already 533 * have the correct target node and there are no name segments. 534 */ 535 NumSegments = 0; 536 Type = ThisNode->Type; 537 538 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 539 "Prefix-only Pathname (Zero name segments), Flags=%X\n", 540 Flags)); 541 break; 542 543 case AML_DUAL_NAME_PREFIX: 544 545 /* More than one NameSeg, search rules do not apply */ 546 547 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 548 549 /* Two segments, point to first name segment */ 550 551 NumSegments = 2; 552 Path++; 553 554 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 555 "Dual Pathname (2 segments, Flags=%X)\n", Flags)); 556 break; 557 558 case AML_MULTI_NAME_PREFIX: 559 560 /* More than one NameSeg, search rules do not apply */ 561 562 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 563 564 /* Extract segment count, point to first name segment */ 565 566 Path++; 567 NumSegments = (UINT32) (UINT8) *Path; 568 Path++; 569 570 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 571 "Multi Pathname (%u Segments, Flags=%X)\n", 572 NumSegments, Flags)); 573 break; 574 575 default: 576 /* 577 * Not a Null name, no Dual or Multi prefix, hence there is 578 * only one name segment and Pathname is already pointing to it. 579 */ 580 NumSegments = 1; 581 582 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 583 "Simple Pathname (1 segment, Flags=%X)\n", Flags)); 584 break; 585 } 586 587 ACPI_DEBUG_EXEC (AcpiNsPrintPathname (NumSegments, Path)); 588 } 589 590 591 /* 592 * Search namespace for each segment of the name. Loop through and 593 * verify (or add to the namespace) each name segment. 594 * 595 * The object type is significant only at the last name 596 * segment. (We don't care about the types along the path, only 597 * the type of the final target object.) 598 */ 599 ThisSearchType = ACPI_TYPE_ANY; 600 CurrentNode = ThisNode; 601 602 while (NumSegments && CurrentNode) 603 { 604 NumSegments--; 605 if (!NumSegments) 606 { 607 /* This is the last segment, enable typechecking */ 608 609 ThisSearchType = Type; 610 611 /* 612 * Only allow automatic parent search (search rules) if the caller 613 * requested it AND we have a single, non-fully-qualified NameSeg 614 */ 615 if ((SearchParentFlag != ACPI_NS_NO_UPSEARCH) && 616 (Flags & ACPI_NS_SEARCH_PARENT)) 617 { 618 LocalFlags |= ACPI_NS_SEARCH_PARENT; 619 } 620 621 /* Set error flag according to caller */ 622 623 if (Flags & ACPI_NS_ERROR_IF_FOUND) 624 { 625 LocalFlags |= ACPI_NS_ERROR_IF_FOUND; 626 } 627 628 /* Set override flag according to caller */ 629 630 if (Flags & ACPI_NS_OVERRIDE_IF_FOUND) 631 { 632 LocalFlags |= ACPI_NS_OVERRIDE_IF_FOUND; 633 } 634 } 635 636 /* Handle opcodes that create a new NameSeg via a full NamePath */ 637 638 LocalInterpreterMode = InterpreterMode; 639 if ((Flags & ACPI_NS_PREFIX_MUST_EXIST) && (NumSegments > 0)) 640 { 641 /* Every element of the path must exist (except for the final NameSeg) */ 642 643 LocalInterpreterMode = ACPI_IMODE_EXECUTE; 644 } 645 646 /* Extract one ACPI name from the front of the pathname */ 647 648 ACPI_MOVE_32_TO_32 (&SimpleName, Path); 649 650 /* Try to find the single (4 character) ACPI name */ 651 652 Status = AcpiNsSearchAndEnter (SimpleName, WalkState, CurrentNode, 653 LocalInterpreterMode, ThisSearchType, LocalFlags, &ThisNode); 654 if (ACPI_FAILURE (Status)) 655 { 656 if (Status == AE_NOT_FOUND) 657 { 658 #if !defined ACPI_ASL_COMPILER /* Note: iASL reports this error by itself, not needed here */ 659 if (Flags & ACPI_NS_PREFIX_MUST_EXIST) 660 { 661 AcpiOsPrintf (ACPI_MSG_BIOS_ERROR 662 "Object does not exist: %4.4s\n", (char *) &SimpleName); 663 } 664 #endif 665 /* Name not found in ACPI namespace */ 666 667 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 668 "Name [%4.4s] not found in scope [%4.4s] %p\n", 669 (char *) &SimpleName, (char *) &CurrentNode->Name, 670 CurrentNode)); 671 } 672 673 #ifdef ACPI_EXEC_APP 674 if ((Status == AE_ALREADY_EXISTS) && 675 (ThisNode->Flags & ANOBJ_NODE_EARLY_INIT)) 676 { 677 ThisNode->Flags &= ~ANOBJ_NODE_EARLY_INIT; 678 Status = AE_OK; 679 } 680 #endif 681 682 #ifdef ACPI_ASL_COMPILER 683 /* 684 * If this ACPI name already exists within the namespace as an 685 * external declaration, then mark the external as a conflicting 686 * declaration and proceed to process the current node as if it did 687 * not exist in the namespace. If this node is not processed as 688 * normal, then it could cause improper namespace resolution 689 * by failing to open a new scope. 690 */ 691 if (AcpiGbl_DisasmFlag && 692 (Status == AE_ALREADY_EXISTS) && 693 ((ThisNode->Flags & ANOBJ_IS_EXTERNAL) || 694 (WalkState && WalkState->Opcode == AML_EXTERNAL_OP))) 695 { 696 ThisNode->Flags &= ~ANOBJ_IS_EXTERNAL; 697 ThisNode->Type = (UINT8)ThisSearchType; 698 if (WalkState->Opcode != AML_EXTERNAL_OP) 699 { 700 AcpiDmMarkExternalConflict (ThisNode); 701 } 702 break; 703 } 704 #endif 705 706 *ReturnNode = ThisNode; 707 return_ACPI_STATUS (Status); 708 } 709 710 /* More segments to follow? */ 711 712 if (NumSegments > 0) 713 { 714 /* 715 * If we have an alias to an object that opens a scope (such as a 716 * device or processor), we need to dereference the alias here so 717 * that we can access any children of the original node (via the 718 * remaining segments). 719 */ 720 if (ThisNode->Type == ACPI_TYPE_LOCAL_ALIAS) 721 { 722 if (!ThisNode->Object) 723 { 724 return_ACPI_STATUS (AE_NOT_EXIST); 725 } 726 727 if (AcpiNsOpensScope (((ACPI_NAMESPACE_NODE *) 728 ThisNode->Object)->Type)) 729 { 730 ThisNode = (ACPI_NAMESPACE_NODE *) ThisNode->Object; 731 } 732 } 733 } 734 735 /* Special handling for the last segment (NumSegments == 0) */ 736 737 else 738 { 739 /* 740 * Sanity typecheck of the target object: 741 * 742 * If 1) This is the last segment (NumSegments == 0) 743 * 2) And we are looking for a specific type 744 * (Not checking for TYPE_ANY) 745 * 3) Which is not an alias 746 * 4) Which is not a local type (TYPE_SCOPE) 747 * 5) And the type of target object is known (not TYPE_ANY) 748 * 6) And target object does not match what we are looking for 749 * 750 * Then we have a type mismatch. Just warn and ignore it. 751 */ 752 if ((TypeToCheckFor != ACPI_TYPE_ANY) && 753 (TypeToCheckFor != ACPI_TYPE_LOCAL_ALIAS) && 754 (TypeToCheckFor != ACPI_TYPE_LOCAL_METHOD_ALIAS) && 755 (TypeToCheckFor != ACPI_TYPE_LOCAL_SCOPE) && 756 (ThisNode->Type != ACPI_TYPE_ANY) && 757 (ThisNode->Type != TypeToCheckFor)) 758 { 759 /* Complain about a type mismatch */ 760 761 ACPI_WARNING ((AE_INFO, 762 "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)", 763 ACPI_CAST_PTR (char, &SimpleName), 764 AcpiUtGetTypeName (ThisNode->Type), 765 AcpiUtGetTypeName (TypeToCheckFor))); 766 } 767 768 /* 769 * If this is the last name segment and we are not looking for a 770 * specific type, but the type of found object is known, use that 771 * type to (later) see if it opens a scope. 772 */ 773 if (Type == ACPI_TYPE_ANY) 774 { 775 Type = ThisNode->Type; 776 } 777 } 778 779 /* Point to next name segment and make this node current */ 780 781 Path += ACPI_NAMESEG_SIZE; 782 CurrentNode = ThisNode; 783 } 784 785 /* Always check if we need to open a new scope */ 786 787 if (!(Flags & ACPI_NS_DONT_OPEN_SCOPE) && (WalkState)) 788 { 789 /* 790 * If entry is a type which opens a scope, push the new scope on the 791 * scope stack. 792 */ 793 if (AcpiNsOpensScope (Type)) 794 { 795 Status = AcpiDsScopeStackPush (ThisNode, Type, WalkState); 796 if (ACPI_FAILURE (Status)) 797 { 798 return_ACPI_STATUS (Status); 799 } 800 } 801 } 802 803 #ifdef ACPI_EXEC_APP 804 if (Flags & ACPI_NS_EARLY_INIT) 805 { 806 ThisNode->Flags |= ANOBJ_NODE_EARLY_INIT; 807 } 808 #endif 809 810 *ReturnNode = ThisNode; 811 return_ACPI_STATUS (AE_OK); 812 } 813