1/******************************************************************************* 2 * 3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace 4 * 5 ******************************************************************************/ 6 7/****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 *****************************************************************************/ 115 116#define __NSACCESS_C__ 117 118#include <contrib/dev/acpica/include/acpi.h> 119#include <contrib/dev/acpica/include/accommon.h> 120#include <contrib/dev/acpica/include/amlcode.h> 121#include <contrib/dev/acpica/include/acnamesp.h> 122#include <contrib/dev/acpica/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 ( 145 void) 146{ 147 ACPI_STATUS Status; 148 const ACPI_PREDEFINED_NAMES *InitVal = NULL; 149 ACPI_NAMESPACE_NODE *NewNode; 150 ACPI_OPERAND_OBJECT *ObjDesc; 151 ACPI_STRING Val = NULL; 152 153 154 ACPI_FUNCTION_TRACE (NsRootInitialize); 155 156 157 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 158 if (ACPI_FAILURE (Status)) 159 { 160 return_ACPI_STATUS (Status); 161 } 162 163 /* 164 * The global root ptr is initially NULL, so a non-NULL value indicates 165 * that AcpiNsRootInitialize() has already been called; just return. 166 */ 167 if (AcpiGbl_RootNode) 168 { 169 Status = AE_OK; 170 goto UnlockAndExit; 171 } 172 173 /* 174 * Tell the rest of the subsystem that the root is initialized 175 * (This is OK because the namespace is locked) 176 */ 177 AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct; 178 179 /* Enter the pre-defined names in the name table */ 180 181 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 182 "Entering predefined entries into namespace\n")); 183 184 for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++) 185 { 186 /* _OSI is optional for now, will be permanent later */ 187 188 if (!ACPI_STRCMP (InitVal->Name, "_OSI") && !AcpiGbl_CreateOsiMethod) 189 { 190 continue; 191 } 192 193 Status = AcpiNsLookup (NULL, InitVal->Name, InitVal->Type, 194 ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH, 195 NULL, &NewNode); 196 197 if (ACPI_FAILURE (Status) || (!NewNode)) /* Must be on same line for code converter */ 198 { 199 ACPI_EXCEPTION ((AE_INFO, Status, 200 "Could not create predefined name %s", 201 InitVal->Name)); 202 } 203 204 /* 205 * Name entered successfully. If entry in PreDefinedNames[] specifies 206 * an 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_ERROR ((AE_INFO, 214 "Could not override predefined %s", 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_TO_INTEGER (Val); 243 ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID; 244 245#if defined (ACPI_ASL_COMPILER) 246 247 /* Save the parameter count for the iASL compiler */ 248 249 NewNode->Value = ObjDesc->Method.ParamCount; 250#else 251 /* Mark this as a very SPECIAL method */ 252 253 ObjDesc->Method.MethodFlags = AML_METHOD_INTERNAL_ONLY;
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255#endif 256 break; 257 258 case ACPI_TYPE_INTEGER: 259 260 ObjDesc->Integer.Value = ACPI_TO_INTEGER (Val); 261 break; 262 263 264 case ACPI_TYPE_STRING: 265 266 /* Build an object around the static string */ 267 268 ObjDesc->String.Length = (UINT32) ACPI_STRLEN (Val); 269 ObjDesc->String.Pointer = Val; 270 ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER; 271 break; 272 273 274 case ACPI_TYPE_MUTEX: 275 276 ObjDesc->Mutex.Node = NewNode; 277 ObjDesc->Mutex.SyncLevel = (UINT8) (ACPI_TO_INTEGER (Val) - 1); 278 279 /* Create a mutex */ 280 281 Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex); 282 if (ACPI_FAILURE (Status)) 283 { 284 AcpiUtRemoveReference (ObjDesc); 285 goto UnlockAndExit; 286 } 287 288 /* Special case for ACPI Global Lock */ 289 290 if (ACPI_STRCMP (InitVal->Name, "_GL_") == 0) 291 { 292 AcpiGbl_GlobalLockMutex = ObjDesc; 293 294 /* Create additional counting semaphore for global lock */ 295 296 Status = AcpiOsCreateSemaphore ( 297 1, 0, &AcpiGbl_GlobalLockSemaphore); 298 if (ACPI_FAILURE (Status)) 299 { 300 AcpiUtRemoveReference (ObjDesc); 301 goto UnlockAndExit; 302 } 303 } 304 break; 305 306 307 default: 308 309 ACPI_ERROR ((AE_INFO, "Unsupported initial type value %X", 310 InitVal->Type)); 311 AcpiUtRemoveReference (ObjDesc); 312 ObjDesc = NULL; 313 continue; 314 } 315 316 /* Store pointer to value descriptor in the Node */ 317 318 Status = AcpiNsAttachObject (NewNode, ObjDesc, 319 ObjDesc->Common.Type); 320 321 /* Remove local reference to the object */ 322 323 AcpiUtRemoveReference (ObjDesc); 324 } 325 } 326 327 328UnlockAndExit: 329 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 330 331 /* Save a handle to "_GPE", it is always present */ 332 333 if (ACPI_SUCCESS (Status)) 334 { 335 Status = AcpiNsGetNode (NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH, 336 &AcpiGbl_FadtGpeDevice); 337 } 338 339 return_ACPI_STATUS (Status); 340} 341 342 343/******************************************************************************* 344 * 345 * FUNCTION: AcpiNsLookup 346 * 347 * PARAMETERS: ScopeInfo - Current scope info block 348 * Pathname - Search pathname, in internal format 349 * (as represented in the AML stream) 350 * Type - Type associated with name 351 * InterpreterMode - IMODE_LOAD_PASS2 => add name if not found 352 * Flags - Flags describing the search restrictions 353 * WalkState - Current state of the walk 354 * ReturnNode - Where the Node is placed (if found 355 * or created successfully) 356 * 357 * RETURN: Status 358 * 359 * DESCRIPTION: Find or enter the passed name in the name space. 360 * Log an error if name not found in Exec mode. 361 * 362 * MUTEX: Assumes namespace is locked. 363 * 364 ******************************************************************************/ 365 366ACPI_STATUS 367AcpiNsLookup ( 368 ACPI_GENERIC_STATE *ScopeInfo, 369 char *Pathname, 370 ACPI_OBJECT_TYPE Type, 371 ACPI_INTERPRETER_MODE InterpreterMode, 372 UINT32 Flags, 373 ACPI_WALK_STATE *WalkState, 374 ACPI_NAMESPACE_NODE **ReturnNode) 375{ 376 ACPI_STATUS Status; 377 char *Path = Pathname; 378 ACPI_NAMESPACE_NODE *PrefixNode; 379 ACPI_NAMESPACE_NODE *CurrentNode = NULL; 380 ACPI_NAMESPACE_NODE *ThisNode = NULL; 381 UINT32 NumSegments; 382 UINT32 NumCarats; 383 ACPI_NAME SimpleName; 384 ACPI_OBJECT_TYPE TypeToCheckFor; 385 ACPI_OBJECT_TYPE ThisSearchType; 386 UINT32 SearchParentFlag = ACPI_NS_SEARCH_PARENT; 387 UINT32 LocalFlags; 388 389 390 ACPI_FUNCTION_TRACE (NsLookup); 391 392 393 if (!ReturnNode) 394 { 395 return_ACPI_STATUS (AE_BAD_PARAMETER); 396 } 397 398 LocalFlags = Flags & ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_SEARCH_PARENT); 399 *ReturnNode = ACPI_ENTRY_NOT_FOUND; 400 AcpiGbl_NsLookupCount++; 401 402 if (!AcpiGbl_RootNode) 403 { 404 return_ACPI_STATUS (AE_NO_NAMESPACE); 405 } 406 407 /* Get the prefix scope. A null scope means use the root scope */ 408 409 if ((!ScopeInfo) || 410 (!ScopeInfo->Scope.Node)) 411 { 412 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 413 "Null scope prefix, using root node (%p)\n", 414 AcpiGbl_RootNode)); 415 416 PrefixNode = AcpiGbl_RootNode; 417 } 418 else 419 { 420 PrefixNode = ScopeInfo->Scope.Node; 421 if (ACPI_GET_DESCRIPTOR_TYPE (PrefixNode) != ACPI_DESC_TYPE_NAMED) 422 { 423 ACPI_ERROR ((AE_INFO, "%p is not a namespace node [%s]", 424 PrefixNode, AcpiUtGetDescriptorName (PrefixNode))); 425 return_ACPI_STATUS (AE_AML_INTERNAL); 426 } 427 428 if (!(Flags & ACPI_NS_PREFIX_IS_SCOPE)) 429 { 430 /* 431 * This node might not be a actual "scope" node (such as a 432 * Device/Method, etc.) It could be a Package or other object 433 * node. Backup up the tree to find the containing scope node. 434 */ 435 while (!AcpiNsOpensScope (PrefixNode->Type) && 436 PrefixNode->Type != ACPI_TYPE_ANY) 437 { 438 PrefixNode = AcpiNsGetParentNode (PrefixNode); 439 } 440 } 441 } 442 443 /* Save type. TBD: may be no longer necessary */ 444 445 TypeToCheckFor = Type; 446 447 /* 448 * Begin examination of the actual pathname 449 */ 450 if (!Pathname) 451 { 452 /* A Null NamePath is allowed and refers to the root */ 453 454 NumSegments = 0; 455 ThisNode = AcpiGbl_RootNode; 456 Path = ""; 457 458 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 459 "Null Pathname (Zero segments), Flags=%X\n", Flags)); 460 } 461 else 462 { 463 /* 464 * Name pointer is valid (and must be in internal name format) 465 * 466 * Check for scope prefixes: 467 * 468 * As represented in the AML stream, a namepath consists of an 469 * optional scope prefix followed by a name segment part. 470 * 471 * If present, the scope prefix is either a Root Prefix (in 472 * which case the name is fully qualified), or one or more 473 * Parent Prefixes (in which case the name's scope is relative 474 * to the current scope). 475 */ 476 if (*Path == (UINT8) AML_ROOT_PREFIX) 477 { 478 /* Pathname is fully qualified, start from the root */ 479 480 ThisNode = AcpiGbl_RootNode; 481 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 482 483 /* Point to name segment part */ 484 485 Path++; 486 487 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 488 "Path is absolute from root [%p]\n", ThisNode)); 489 } 490 else 491 { 492 /* Pathname is relative to current scope, start there */ 493 494 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 495 "Searching relative to prefix scope [%4.4s] (%p)\n", 496 AcpiUtGetNodeName (PrefixNode), PrefixNode)); 497 498 /* 499 * Handle multiple Parent Prefixes (carat) by just getting 500 * the parent node for each prefix instance. 501 */ 502 ThisNode = PrefixNode; 503 NumCarats = 0; 504 while (*Path == (UINT8) AML_PARENT_PREFIX) 505 { 506 /* Name is fully qualified, no search rules apply */ 507 508 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 509 510 /* 511 * Point past this prefix to the name segment 512 * part or the next Parent Prefix 513 */ 514 Path++; 515 516 /* Backup to the parent node */ 517 518 NumCarats++; 519 ThisNode = AcpiNsGetParentNode (ThisNode); 520 if (!ThisNode) 521 { 522 /* Current scope has no parent scope */ 523 524 ACPI_ERROR ((AE_INFO, 525 "ACPI path has too many parent prefixes (^) " 526 "- reached beyond root node")); 527 return_ACPI_STATUS (AE_NOT_FOUND); 528 } 529 } 530 531 if (SearchParentFlag == ACPI_NS_NO_UPSEARCH) 532 { 533 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 534 "Search scope is [%4.4s], path has %d carat(s)\n", 535 AcpiUtGetNodeName (ThisNode), NumCarats)); 536 } 537 } 538 539 /* 540 * Determine the number of ACPI name segments in this pathname. 541 * 542 * The segment part consists of either: 543 * - A Null name segment (0) 544 * - A DualNamePrefix followed by two 4-byte name segments 545 * - A MultiNamePrefix followed by a byte indicating the 546 * number of segments and the segments themselves. 547 * - A single 4-byte name segment 548 * 549 * Examine the name prefix opcode, if any, to determine the number of 550 * segments. 551 */ 552 switch (*Path) 553 { 554 case 0: 555 /* 556 * Null name after a root or parent prefixes. We already 557 * have the correct target node and there are no name segments. 558 */ 559 NumSegments = 0; 560 Type = ThisNode->Type; 561 562 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 563 "Prefix-only Pathname (Zero name segments), Flags=%X\n", 564 Flags)); 565 break; 566 567 case AML_DUAL_NAME_PREFIX: 568 569 /* More than one NameSeg, search rules do not apply */ 570 571 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 572 573 /* Two segments, point to first name segment */ 574 575 NumSegments = 2; 576 Path++; 577 578 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 579 "Dual Pathname (2 segments, Flags=%X)\n", Flags)); 580 break; 581 582 case AML_MULTI_NAME_PREFIX_OP: 583 584 /* More than one NameSeg, search rules do not apply */ 585 586 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 587 588 /* Extract segment count, point to first name segment */ 589 590 Path++; 591 NumSegments = (UINT32) (UINT8) *Path; 592 Path++; 593 594 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 595 "Multi Pathname (%d Segments, Flags=%X)\n", 596 NumSegments, Flags)); 597 break; 598 599 default: 600 /* 601 * Not a Null name, no Dual or Multi prefix, hence there is 602 * only one name segment and Pathname is already pointing to it. 603 */ 604 NumSegments = 1; 605 606 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 607 "Simple Pathname (1 segment, Flags=%X)\n", Flags)); 608 break; 609 } 610 611 ACPI_DEBUG_EXEC (AcpiNsPrintPathname (NumSegments, Path)); 612 } 613 614 615 /* 616 * Search namespace for each segment of the name. Loop through and 617 * verify (or add to the namespace) each name segment. 618 * 619 * The object type is significant only at the last name 620 * segment. (We don't care about the types along the path, only 621 * the type of the final target object.) 622 */ 623 ThisSearchType = ACPI_TYPE_ANY; 624 CurrentNode = ThisNode; 625 while (NumSegments && CurrentNode) 626 { 627 NumSegments--; 628 if (!NumSegments) 629 { 630 /* This is the last segment, enable typechecking */ 631 632 ThisSearchType = Type; 633 634 /* 635 * Only allow automatic parent search (search rules) if the caller 636 * requested it AND we have a single, non-fully-qualified NameSeg 637 */ 638 if ((SearchParentFlag != ACPI_NS_NO_UPSEARCH) && 639 (Flags & ACPI_NS_SEARCH_PARENT)) 640 { 641 LocalFlags |= ACPI_NS_SEARCH_PARENT; 642 } 643 644 /* Set error flag according to caller */ 645 646 if (Flags & ACPI_NS_ERROR_IF_FOUND) 647 { 648 LocalFlags |= ACPI_NS_ERROR_IF_FOUND; 649 } 650 } 651 652 /* Extract one ACPI name from the front of the pathname */ 653 654 ACPI_MOVE_32_TO_32 (&SimpleName, Path); 655 656 /* Try to find the single (4 character) ACPI name */ 657 658 Status = AcpiNsSearchAndEnter (SimpleName, WalkState, CurrentNode, 659 InterpreterMode, ThisSearchType, LocalFlags, &ThisNode); 660 if (ACPI_FAILURE (Status)) 661 { 662 if (Status == AE_NOT_FOUND) 663 { 664 /* Name not found in ACPI namespace */ 665 666 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 667 "Name [%4.4s] not found in scope [%4.4s] %p\n", 668 (char *) &SimpleName, (char *) &CurrentNode->Name, 669 CurrentNode)); 670 } 671 672 *ReturnNode = ThisNode; 673 return_ACPI_STATUS (Status); 674 } 675 676 /* More segments to follow? */ 677 678 if (NumSegments > 0) 679 { 680 /* 681 * If we have an alias to an object that opens a scope (such as a 682 * device or processor), we need to dereference the alias here so 683 * that we can access any children of the original node (via the 684 * remaining segments). 685 */ 686 if (ThisNode->Type == ACPI_TYPE_LOCAL_ALIAS) 687 { 688 if (!ThisNode->Object) 689 { 690 return_ACPI_STATUS (AE_NOT_EXIST); 691 } 692 693 if (AcpiNsOpensScope (((ACPI_NAMESPACE_NODE *) 694 ThisNode->Object)->Type)) 695 { 696 ThisNode = (ACPI_NAMESPACE_NODE *) ThisNode->Object; 697 } 698 } 699 } 700 701 /* Special handling for the last segment (NumSegments == 0) */ 702 703 else 704 { 705 /* 706 * Sanity typecheck of the target object: 707 * 708 * If 1) This is the last segment (NumSegments == 0) 709 * 2) And we are looking for a specific type 710 * (Not checking for TYPE_ANY) 711 * 3) Which is not an alias 712 * 4) Which is not a local type (TYPE_SCOPE) 713 * 5) And the type of target object is known (not TYPE_ANY) 714 * 6) And target object does not match what we are looking for 715 * 716 * Then we have a type mismatch. Just warn and ignore it. 717 */ 718 if ((TypeToCheckFor != ACPI_TYPE_ANY) && 719 (TypeToCheckFor != ACPI_TYPE_LOCAL_ALIAS) && 720 (TypeToCheckFor != ACPI_TYPE_LOCAL_METHOD_ALIAS) && 721 (TypeToCheckFor != ACPI_TYPE_LOCAL_SCOPE) && 722 (ThisNode->Type != ACPI_TYPE_ANY) && 723 (ThisNode->Type != TypeToCheckFor)) 724 { 725 /* Complain about a type mismatch */ 726 727 ACPI_WARNING ((AE_INFO, 728 "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)", 729 ACPI_CAST_PTR (char, &SimpleName), 730 AcpiUtGetTypeName (ThisNode->Type), 731 AcpiUtGetTypeName (TypeToCheckFor))); 732 } 733 734 /* 735 * If this is the last name segment and we are not looking for a 736 * specific type, but the type of found object is known, use that 737 * type to (later) see if it opens a scope. 738 */ 739 if (Type == ACPI_TYPE_ANY) 740 { 741 Type = ThisNode->Type; 742 } 743 } 744 745 /* Point to next name segment and make this node current */ 746 747 Path += ACPI_NAME_SIZE; 748 CurrentNode = ThisNode; 749 } 750 751 /* Always check if we need to open a new scope */ 752 753 if (!(Flags & ACPI_NS_DONT_OPEN_SCOPE) && (WalkState)) 754 { 755 /* 756 * If entry is a type which opens a scope, push the new scope on the 757 * scope stack. 758 */ 759 if (AcpiNsOpensScope (Type)) 760 { 761 Status = AcpiDsScopeStackPush (ThisNode, Type, WalkState); 762 if (ACPI_FAILURE (Status)) 763 { 764 return_ACPI_STATUS (Status); 765 } 766 } 767 } 768 769 *ReturnNode = ThisNode; 770 return_ACPI_STATUS (AE_OK); 771} 772
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