nsaccess.c revision 127175
1/******************************************************************************* 2 * 3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace 4 * $Revision: 179 $ 5 * 6 ******************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2004, 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 "acnamesp.h" 122#include "acdispat.h" 123 124 125#define _COMPONENT ACPI_NAMESPACE 126 ACPI_MODULE_NAME ("nsaccess") 127 128 129/******************************************************************************* 130 * 131 * FUNCTION: AcpiNsRootInitialize 132 * 133 * PARAMETERS: None 134 * 135 * RETURN: Status 136 * 137 * DESCRIPTION: Allocate and initialize the default root named objects 138 * 139 * MUTEX: Locks namespace for entire execution 140 * 141 ******************************************************************************/ 142 143ACPI_STATUS 144AcpiNsRootInitialize (void) 145{ 146 ACPI_STATUS Status; 147 const ACPI_PREDEFINED_NAMES *InitVal = NULL; 148 ACPI_NAMESPACE_NODE *NewNode; 149 ACPI_OPERAND_OBJECT *ObjDesc; 150 ACPI_STRING Val = NULL; 151 152 153 ACPI_FUNCTION_TRACE ("NsRootInitialize"); 154 155 156 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 157 if (ACPI_FAILURE (Status)) 158 { 159 return_ACPI_STATUS (Status); 160 } 161 162 /* 163 * The global root ptr is initially NULL, so a non-NULL value indicates 164 * that AcpiNsRootInitialize() has already been called; just return. 165 */ 166 if (AcpiGbl_RootNode) 167 { 168 Status = AE_OK; 169 goto UnlockAndExit; 170 } 171 172 /* 173 * Tell the rest of the subsystem that the root is initialized 174 * (This is OK because the namespace is locked) 175 */ 176 AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct; 177 178 /* Enter the pre-defined names in the name table */ 179 180 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 181 "Entering predefined entries into namespace\n")); 182 183 for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++) 184 { 185 /* _OSI is optional for now, will be permanent later */ 186 187 if (!ACPI_STRCMP (InitVal->Name, "_OSI") && !AcpiGbl_CreateOsiMethod) 188 { 189 continue; 190 } 191 192 Status = AcpiNsLookup (NULL, InitVal->Name, InitVal->Type, 193 ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH, 194 NULL, &NewNode); 195 196 if (ACPI_FAILURE (Status) || (!NewNode)) /* Must be on same line for code converter */ 197 { 198 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 199 "Could not create predefined name %s, %s\n", 200 InitVal->Name, AcpiFormatException (Status))); 201 } 202 203 /* 204 * Name entered successfully. 205 * If entry in PreDefinedNames[] specifies an 206 * initial value, create the initial value. 207 */ 208 if (InitVal->Val) 209 { 210 Status = AcpiOsPredefinedOverride (InitVal, &Val); 211 if (ACPI_FAILURE (Status)) 212 { 213 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, 214 "Could not override predefined %s\n", 215 InitVal->Name)); 216 } 217 218 if (!Val) 219 { 220 Val = InitVal->Val; 221 } 222 223 /* 224 * Entry requests an initial value, allocate a 225 * descriptor for it. 226 */ 227 ObjDesc = AcpiUtCreateInternalObject (InitVal->Type); 228 if (!ObjDesc) 229 { 230 Status = AE_NO_MEMORY; 231 goto UnlockAndExit; 232 } 233 234 /* 235 * Convert value string from table entry to 236 * internal representation. Only types actually 237 * used for initial values are implemented here. 238 */ 239 switch (InitVal->Type) 240 { 241 case ACPI_TYPE_METHOD: 242 ObjDesc->Method.ParamCount = (UINT8) ACPI_STRTOUL 243 (Val, NULL, 10); 244 ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID; 245 246#if defined (_ACPI_ASL_COMPILER) || defined (_ACPI_DUMP_APP) 247 248 /* iASL Compiler cheats by putting parameter count in the OwnerID */ 249 250 NewNode->OwnerId = ObjDesc->Method.ParamCount; 251#else 252 /* Mark this as a very SPECIAL method */ 253 254 ObjDesc->Method.MethodFlags = AML_METHOD_INTERNAL_ONLY; 255 ObjDesc->Method.Implementation = AcpiUtOsiImplementation; 256#endif 257 break; 258 259 case ACPI_TYPE_INTEGER: 260 261 ObjDesc->Integer.Value = 262 (ACPI_INTEGER) ACPI_STRTOUL (Val, NULL, 10); 263 break; 264 265 266 case ACPI_TYPE_STRING: 267 268 /* 269 * Build an object around the static string 270 */ 271 ObjDesc->String.Length = (UINT32) ACPI_STRLEN (Val); 272 ObjDesc->String.Pointer = Val; 273 ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER; 274 break; 275 276 277 case ACPI_TYPE_MUTEX: 278 279 ObjDesc->Mutex.Node = NewNode; 280 ObjDesc->Mutex.SyncLevel = (UINT16) ACPI_STRTOUL 281 (Val, NULL, 10); 282 283 if (ACPI_STRCMP (InitVal->Name, "_GL_") == 0) 284 { 285 /* 286 * Create a counting semaphore for the 287 * global lock 288 */ 289 Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 290 1, &ObjDesc->Mutex.Semaphore); 291 if (ACPI_FAILURE (Status)) 292 { 293 goto UnlockAndExit; 294 } 295 296 /* 297 * We just created the mutex for the 298 * global lock, save it 299 */ 300 AcpiGbl_GlobalLockSemaphore = ObjDesc->Mutex.Semaphore; 301 } 302 else 303 { 304 /* Create a mutex */ 305 306 Status = AcpiOsCreateSemaphore (1, 1, 307 &ObjDesc->Mutex.Semaphore); 308 if (ACPI_FAILURE (Status)) 309 { 310 goto UnlockAndExit; 311 } 312 } 313 break; 314 315 316 default: 317 318 ACPI_REPORT_ERROR (("Unsupported initial type value %X\n", 319 InitVal->Type)); 320 AcpiUtRemoveReference (ObjDesc); 321 ObjDesc = NULL; 322 continue; 323 } 324 325 /* Store pointer to value descriptor in the Node */ 326 327 Status = AcpiNsAttachObject (NewNode, ObjDesc, ACPI_GET_OBJECT_TYPE (ObjDesc)); 328 329 /* Remove local reference to the object */ 330 331 AcpiUtRemoveReference (ObjDesc); 332 } 333 } 334 335 336UnlockAndExit: 337 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 338 return_ACPI_STATUS (Status); 339} 340 341 342/******************************************************************************* 343 * 344 * FUNCTION: AcpiNsLookup 345 * 346 * PARAMETERS: PrefixNode - Search scope if name is not fully qualified 347 * Pathname - Search pathname, in internal format 348 * (as represented in the AML stream) 349 * Type - Type associated with name 350 * InterpreterMode - IMODE_LOAD_PASS2 => add name if not found 351 * Flags - Flags describing the search restrictions 352 * WalkState - Current state of the walk 353 * ReturnNode - Where the Node is placed (if found 354 * or created successfully) 355 * 356 * RETURN: Status 357 * 358 * DESCRIPTION: Find or enter the passed name in the name space. 359 * Log an error if name not found in Exec mode. 360 * 361 * MUTEX: Assumes namespace is locked. 362 * 363 ******************************************************************************/ 364 365ACPI_STATUS 366AcpiNsLookup ( 367 ACPI_GENERIC_STATE *ScopeInfo, 368 char *Pathname, 369 ACPI_OBJECT_TYPE Type, 370 ACPI_INTERPRETER_MODE InterpreterMode, 371 UINT32 Flags, 372 ACPI_WALK_STATE *WalkState, 373 ACPI_NAMESPACE_NODE **ReturnNode) 374{ 375 ACPI_STATUS Status; 376 char *Path = Pathname; 377 ACPI_NAMESPACE_NODE *PrefixNode; 378 ACPI_NAMESPACE_NODE *CurrentNode = NULL; 379 ACPI_NAMESPACE_NODE *ThisNode = NULL; 380 UINT32 NumSegments; 381 UINT32 NumCarats; 382 ACPI_NAME SimpleName; 383 ACPI_OBJECT_TYPE TypeToCheckFor; 384 ACPI_OBJECT_TYPE ThisSearchType; 385 UINT32 SearchParentFlag = ACPI_NS_SEARCH_PARENT; 386 UINT32 LocalFlags = Flags & ~(ACPI_NS_ERROR_IF_FOUND | 387 ACPI_NS_SEARCH_PARENT); 388 389 390 ACPI_FUNCTION_TRACE ("NsLookup"); 391 392 393 if (!ReturnNode) 394 { 395 return_ACPI_STATUS (AE_BAD_PARAMETER); 396 } 397 398 AcpiGbl_NsLookupCount++; 399 *ReturnNode = ACPI_ENTRY_NOT_FOUND; 400 401 if (!AcpiGbl_RootNode) 402 { 403 return_ACPI_STATUS (AE_NO_NAMESPACE); 404 } 405 406 /* 407 * Get the prefix scope. 408 * A null scope means use the root scope 409 */ 410 if ((!ScopeInfo) || 411 (!ScopeInfo->Scope.Node)) 412 { 413 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 414 "Null scope prefix, using root node (%p)\n", 415 AcpiGbl_RootNode)); 416 417 PrefixNode = AcpiGbl_RootNode; 418 } 419 else 420 { 421 PrefixNode = ScopeInfo->Scope.Node; 422 if (ACPI_GET_DESCRIPTOR_TYPE (PrefixNode) != ACPI_DESC_TYPE_NAMED) 423 { 424 ACPI_REPORT_ERROR (("NsLookup: %p is not a namespace node [%s]\n", 425 PrefixNode, AcpiUtGetDescriptorName (PrefixNode))); 426 return_ACPI_STATUS (AE_AML_INTERNAL); 427 } 428 429 /* 430 * This node might not be a actual "scope" node (such as a 431 * Device/Method, etc.) It could be a Package or other object node. 432 * Backup up the tree to find the containing scope node. 433 */ 434 while (!AcpiNsOpensScope (PrefixNode->Type) && 435 PrefixNode->Type != ACPI_TYPE_ANY) 436 { 437 PrefixNode = AcpiNsGetParentNode (PrefixNode); 438 } 439 } 440 441 /* Save type TBD: may be no longer necessary */ 442 443 TypeToCheckFor = Type; 444 445 /* 446 * Begin examination of the actual pathname 447 */ 448 if (!Pathname) 449 { 450 /* A Null NamePath is allowed and refers to the root */ 451 452 NumSegments = 0; 453 ThisNode = AcpiGbl_RootNode; 454 Path = ""; 455 456 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 457 "Null Pathname (Zero segments), Flags=%X\n", Flags)); 458 } 459 else 460 { 461 /* 462 * Name pointer is valid (and must be in internal name format) 463 * 464 * Check for scope prefixes: 465 * 466 * As represented in the AML stream, a namepath consists of an 467 * optional scope prefix followed by a name segment part. 468 * 469 * If present, the scope prefix is either a Root Prefix (in 470 * which case the name is fully qualified), or one or more 471 * Parent Prefixes (in which case the name's scope is relative 472 * to the current scope). 473 */ 474 if (*Path == (UINT8) AML_ROOT_PREFIX) 475 { 476 /* Pathname is fully qualified, start from the root */ 477 478 ThisNode = AcpiGbl_RootNode; 479 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 480 481 /* Point to name segment part */ 482 483 Path++; 484 485 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 486 "Path is absolute from root [%p]\n", ThisNode)); 487 } 488 else 489 { 490 /* Pathname is relative to current scope, start there */ 491 492 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 493 "Searching relative to prefix scope [%4.4s] (%p)\n", 494 AcpiUtGetNodeName (PrefixNode), PrefixNode)); 495 496 /* 497 * Handle multiple Parent Prefixes (carat) by just getting 498 * the parent node for each prefix instance. 499 */ 500 ThisNode = PrefixNode; 501 NumCarats = 0; 502 while (*Path == (UINT8) AML_PARENT_PREFIX) 503 { 504 /* Name is fully qualified, no search rules apply */ 505 506 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 507 /* 508 * Point past this prefix to the name segment 509 * part or the next Parent Prefix 510 */ 511 Path++; 512 513 /* Backup to the parent node */ 514 515 NumCarats++; 516 ThisNode = AcpiNsGetParentNode (ThisNode); 517 if (!ThisNode) 518 { 519 /* Current scope has no parent scope */ 520 521 ACPI_REPORT_ERROR ( 522 ("ACPI path has too many parent prefixes (^) - reached beyond root node\n")); 523 return_ACPI_STATUS (AE_NOT_FOUND); 524 } 525 } 526 527 if (SearchParentFlag == ACPI_NS_NO_UPSEARCH) 528 { 529 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 530 "Search scope is [%4.4s], path has %d carat(s)\n", 531 AcpiUtGetNodeName (ThisNode), NumCarats)); 532 } 533 } 534 535 /* 536 * Determine the number of ACPI name segments in this pathname. 537 * 538 * The segment part consists of either: 539 * - A Null name segment (0) 540 * - A DualNamePrefix followed by two 4-byte name segments 541 * - A MultiNamePrefix followed by a byte indicating the 542 * number of segments and the segments themselves. 543 * - A single 4-byte name segment 544 * 545 * Examine the name prefix opcode, if any, to determine the number of 546 * segments. 547 */ 548 switch (*Path) 549 { 550 case 0: 551 /* 552 * Null name after a root or parent prefixes. We already 553 * have the correct target node and there are no name segments. 554 */ 555 NumSegments = 0; 556 Type = ThisNode->Type; 557 558 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 559 "Prefix-only Pathname (Zero name segments), Flags=%X\n", Flags)); 560 break; 561 562 case AML_DUAL_NAME_PREFIX: 563 564 /* More than one NameSeg, search rules do not apply */ 565 566 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 567 568 /* Two segments, point to first name segment */ 569 570 NumSegments = 2; 571 Path++; 572 573 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 574 "Dual Pathname (2 segments, Flags=%X)\n", Flags)); 575 break; 576 577 case AML_MULTI_NAME_PREFIX_OP: 578 579 /* More than one NameSeg, search rules do not apply */ 580 581 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 582 583 /* Extract segment count, point to first name segment */ 584 585 Path++; 586 NumSegments = (UINT32) (UINT8) *Path; 587 Path++; 588 589 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 590 "Multi Pathname (%d Segments, Flags=%X) \n", 591 NumSegments, Flags)); 592 break; 593 594 default: 595 /* 596 * Not a Null name, no Dual or Multi prefix, hence there is 597 * only one name segment and Pathname is already pointing to it. 598 */ 599 NumSegments = 1; 600 601 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 602 "Simple Pathname (1 segment, Flags=%X)\n", Flags)); 603 break; 604 } 605 606 ACPI_DEBUG_EXEC (AcpiNsPrintPathname (NumSegments, Path)); 607 } 608 609 610 /* 611 * Search namespace for each segment of the name. Loop through and 612 * verify (or add to the namespace) each name segment. 613 * 614 * The object type is significant only at the last name 615 * segment. (We don't care about the types along the path, only 616 * the type of the final target object.) 617 */ 618 ThisSearchType = ACPI_TYPE_ANY; 619 CurrentNode = ThisNode; 620 while (NumSegments && CurrentNode) 621 { 622 NumSegments--; 623 if (!NumSegments) 624 { 625 /* 626 * This is the last segment, enable typechecking 627 */ 628 ThisSearchType = Type; 629 630 /* 631 * Only allow automatic parent search (search rules) if the caller 632 * requested it AND we have a single, non-fully-qualified NameSeg 633 */ 634 if ((SearchParentFlag != ACPI_NS_NO_UPSEARCH) && 635 (Flags & ACPI_NS_SEARCH_PARENT)) 636 { 637 LocalFlags |= ACPI_NS_SEARCH_PARENT; 638 } 639 640 /* Set error flag according to caller */ 641 642 if (Flags & ACPI_NS_ERROR_IF_FOUND) 643 { 644 LocalFlags |= ACPI_NS_ERROR_IF_FOUND; 645 } 646 } 647 648 /* Extract one ACPI name from the front of the pathname */ 649 650 ACPI_MOVE_32_TO_32 (&SimpleName, Path); 651 652 /* Try to find the single (4 character) ACPI name */ 653 654 Status = AcpiNsSearchAndEnter (SimpleName, WalkState, CurrentNode, 655 InterpreterMode, ThisSearchType, LocalFlags, &ThisNode); 656 if (ACPI_FAILURE (Status)) 657 { 658 if (Status == AE_NOT_FOUND) 659 { 660 /* Name not found in ACPI namespace */ 661 662 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 663 "Name [%4.4s] not found in scope [%4.4s] %p\n", 664 (char *) &SimpleName, (char *) &CurrentNode->Name, 665 CurrentNode)); 666 } 667 668 *ReturnNode = ThisNode; 669 return_ACPI_STATUS (Status); 670 } 671 672 /* 673 * Sanity typecheck of the target object: 674 * 675 * If 1) This is the last segment (NumSegments == 0) 676 * 2) And we are looking for a specific type 677 * (Not checking for TYPE_ANY) 678 * 3) Which is not an alias 679 * 4) Which is not a local type (TYPE_SCOPE) 680 * 5) And the type of target object is known (not TYPE_ANY) 681 * 6) And target object does not match what we are looking for 682 * 683 * Then we have a type mismatch. Just warn and ignore it. 684 */ 685 if ((NumSegments == 0) && 686 (TypeToCheckFor != ACPI_TYPE_ANY) && 687 (TypeToCheckFor != ACPI_TYPE_LOCAL_ALIAS) && 688 (TypeToCheckFor != ACPI_TYPE_LOCAL_SCOPE) && 689 (ThisNode->Type != ACPI_TYPE_ANY) && 690 (ThisNode->Type != TypeToCheckFor)) 691 { 692 /* Complain about a type mismatch */ 693 694 ACPI_REPORT_WARNING ( 695 ("NsLookup: Type mismatch on %4.4s (%s), searching for (%s)\n", 696 (char *) &SimpleName, AcpiUtGetTypeName (ThisNode->Type), 697 AcpiUtGetTypeName (TypeToCheckFor))); 698 } 699 700 /* 701 * If this is the last name segment and we are not looking for a 702 * specific type, but the type of found object is known, use that type 703 * to see if it opens a scope. 704 */ 705 if ((NumSegments == 0) && (Type == ACPI_TYPE_ANY)) 706 { 707 Type = ThisNode->Type; 708 } 709 710 /* Point to next name segment and make this node current */ 711 712 Path += ACPI_NAME_SIZE; 713 CurrentNode = ThisNode; 714 } 715 716 /* 717 * Always check if we need to open a new scope 718 */ 719 if (!(Flags & ACPI_NS_DONT_OPEN_SCOPE) && (WalkState)) 720 { 721 /* 722 * If entry is a type which opens a scope, push the new scope on the 723 * scope stack. 724 */ 725 if (AcpiNsOpensScope (Type)) 726 { 727 Status = AcpiDsScopeStackPush (ThisNode, Type, WalkState); 728 if (ACPI_FAILURE (Status)) 729 { 730 return_ACPI_STATUS (Status); 731 } 732 } 733 } 734 735 *ReturnNode = ThisNode; 736 return_ACPI_STATUS (AE_OK); 737} 738 739