1 /*******************************************************************************
3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace
5 ******************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2019, Intel Corp.
12 * All rights reserved.
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
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
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;
37 * The above copyright and patent license is granted only if the following
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.
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
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
72 * 3.4. Intel retains all right, title, and interest in and to the Original
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.
80 * 4. Disclaimer and Export Compliance
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
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
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.
114 *****************************************************************************
116 * Alternatively, you may choose to be licensed under the terms of the
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
122 * 1. Redistributions of source code must retain the above copyright
123 * notice, this list of conditions, and the following disclaimer,
124 * without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 * substantially similar to the "NO WARRANTY" disclaimer below
127 * ("Disclaimer") and any redistribution must be conditioned upon
128 * including a substantially similar Disclaimer requirement for further
129 * binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 * of any contributors may be used to endorse or promote products derived
132 * from this software without specific prior written permission.
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
150 *****************************************************************************/
152 #include <contrib/dev/acpica/include/acpi.h>
153 #include <contrib/dev/acpica/include/accommon.h>
154 #include <contrib/dev/acpica/include/amlcode.h>
155 #include <contrib/dev/acpica/include/acnamesp.h>
156 #include <contrib/dev/acpica/include/acdispat.h>
158 #ifdef ACPI_ASL_COMPILER
159 #include <contrib/dev/acpica/include/acdisasm.h>
162 #define _COMPONENT ACPI_NAMESPACE
163 ACPI_MODULE_NAME ("nsaccess")
166 /*******************************************************************************
168 * FUNCTION: AcpiNsRootInitialize
174 * DESCRIPTION: Allocate and initialize the default root named objects
176 * MUTEX: Locks namespace for entire execution
178 ******************************************************************************/
181 AcpiNsRootInitialize (
185 const ACPI_PREDEFINED_NAMES *InitVal = NULL;
186 ACPI_NAMESPACE_NODE *NewNode;
187 ACPI_OPERAND_OBJECT *ObjDesc;
188 ACPI_STRING Val = NULL;
191 ACPI_FUNCTION_TRACE (NsRootInitialize);
194 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
195 if (ACPI_FAILURE (Status))
197 return_ACPI_STATUS (Status);
201 * The global root ptr is initially NULL, so a non-NULL value indicates
202 * that AcpiNsRootInitialize() has already been called; just return.
204 if (AcpiGbl_RootNode)
211 * Tell the rest of the subsystem that the root is initialized
212 * (This is OK because the namespace is locked)
214 AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct;
216 /* Enter the pre-defined names in the name table */
218 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
219 "Entering predefined entries into namespace\n"));
221 for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++)
223 /* _OSI is optional for now, will be permanent later */
225 if (!strcmp (InitVal->Name, "_OSI") && !AcpiGbl_CreateOsiMethod)
230 Status = AcpiNsLookup (NULL, ACPI_CAST_PTR (char, InitVal->Name),
231 InitVal->Type, ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH,
233 if (ACPI_FAILURE (Status))
235 ACPI_EXCEPTION ((AE_INFO, Status,
236 "Could not create predefined name %s",
242 * Name entered successfully. If entry in PreDefinedNames[] specifies
243 * an initial value, create the initial value.
247 Status = AcpiOsPredefinedOverride (InitVal, &Val);
248 if (ACPI_FAILURE (Status))
250 ACPI_ERROR ((AE_INFO,
251 "Could not override predefined %s",
261 * Entry requests an initial value, allocate a
264 ObjDesc = AcpiUtCreateInternalObject (InitVal->Type);
267 Status = AE_NO_MEMORY;
272 * Convert value string from table entry to
273 * internal representation. Only types actually
274 * used for initial values are implemented here.
276 switch (InitVal->Type)
278 case ACPI_TYPE_METHOD:
280 ObjDesc->Method.ParamCount = (UINT8) ACPI_TO_INTEGER (Val);
281 ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID;
283 #if defined (ACPI_ASL_COMPILER)
285 /* Save the parameter count for the iASL compiler */
287 NewNode->Value = ObjDesc->Method.ParamCount;
289 /* Mark this as a very SPECIAL method */
291 ObjDesc->Method.InfoFlags = ACPI_METHOD_INTERNAL_ONLY;
292 ObjDesc->Method.Dispatch.Implementation = AcpiUtOsiImplementation;
296 case ACPI_TYPE_INTEGER:
298 ObjDesc->Integer.Value = ACPI_TO_INTEGER (Val);
301 case ACPI_TYPE_STRING:
303 /* Build an object around the static string */
305 ObjDesc->String.Length = (UINT32) strlen (Val);
306 ObjDesc->String.Pointer = Val;
307 ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER;
310 case ACPI_TYPE_MUTEX:
312 ObjDesc->Mutex.Node = NewNode;
313 ObjDesc->Mutex.SyncLevel = (UINT8) (ACPI_TO_INTEGER (Val) - 1);
317 Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex);
318 if (ACPI_FAILURE (Status))
320 AcpiUtRemoveReference (ObjDesc);
324 /* Special case for ACPI Global Lock */
326 if (strcmp (InitVal->Name, "_GL_") == 0)
328 AcpiGbl_GlobalLockMutex = ObjDesc;
330 /* Create additional counting semaphore for global lock */
332 Status = AcpiOsCreateSemaphore (
333 1, 0, &AcpiGbl_GlobalLockSemaphore);
334 if (ACPI_FAILURE (Status))
336 AcpiUtRemoveReference (ObjDesc);
344 ACPI_ERROR ((AE_INFO, "Unsupported initial type value 0x%X",
346 AcpiUtRemoveReference (ObjDesc);
351 /* Store pointer to value descriptor in the Node */
353 Status = AcpiNsAttachObject (NewNode, ObjDesc,
354 ObjDesc->Common.Type);
356 /* Remove local reference to the object */
358 AcpiUtRemoveReference (ObjDesc);
364 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
366 /* Save a handle to "_GPE", it is always present */
368 if (ACPI_SUCCESS (Status))
370 Status = AcpiNsGetNode (NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH,
371 &AcpiGbl_FadtGpeDevice);
374 return_ACPI_STATUS (Status);
378 /*******************************************************************************
380 * FUNCTION: AcpiNsLookup
382 * PARAMETERS: ScopeInfo - Current scope info block
383 * Pathname - Search pathname, in internal format
384 * (as represented in the AML stream)
385 * Type - Type associated with name
386 * InterpreterMode - IMODE_LOAD_PASS2 => add name if not found
387 * Flags - Flags describing the search restrictions
388 * WalkState - Current state of the walk
389 * ReturnNode - Where the Node is placed (if found
390 * or created successfully)
394 * DESCRIPTION: Find or enter the passed name in the name space.
395 * Log an error if name not found in Exec mode.
397 * MUTEX: Assumes namespace is locked.
399 ******************************************************************************/
403 ACPI_GENERIC_STATE *ScopeInfo,
405 ACPI_OBJECT_TYPE Type,
406 ACPI_INTERPRETER_MODE InterpreterMode,
408 ACPI_WALK_STATE *WalkState,
409 ACPI_NAMESPACE_NODE **ReturnNode)
412 char *Path = Pathname;
414 ACPI_NAMESPACE_NODE *PrefixNode;
415 ACPI_NAMESPACE_NODE *CurrentNode = NULL;
416 ACPI_NAMESPACE_NODE *ThisNode = NULL;
419 ACPI_NAME SimpleName;
420 ACPI_OBJECT_TYPE TypeToCheckFor;
421 ACPI_OBJECT_TYPE ThisSearchType;
422 UINT32 SearchParentFlag = ACPI_NS_SEARCH_PARENT;
424 ACPI_INTERPRETER_MODE LocalInterpreterMode;
427 ACPI_FUNCTION_TRACE (NsLookup);
432 return_ACPI_STATUS (AE_BAD_PARAMETER);
436 ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND |
437 ACPI_NS_SEARCH_PARENT);
438 *ReturnNode = ACPI_ENTRY_NOT_FOUND;
439 AcpiGbl_NsLookupCount++;
441 if (!AcpiGbl_RootNode)
443 return_ACPI_STATUS (AE_NO_NAMESPACE);
446 /* Get the prefix scope. A null scope means use the root scope */
449 (!ScopeInfo->Scope.Node))
451 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
452 "Null scope prefix, using root node (%p)\n",
455 PrefixNode = AcpiGbl_RootNode;
459 PrefixNode = ScopeInfo->Scope.Node;
460 if (ACPI_GET_DESCRIPTOR_TYPE (PrefixNode) != ACPI_DESC_TYPE_NAMED)
462 ACPI_ERROR ((AE_INFO, "%p is not a namespace node [%s]",
463 PrefixNode, AcpiUtGetDescriptorName (PrefixNode)));
464 return_ACPI_STATUS (AE_AML_INTERNAL);
467 if (!(Flags & ACPI_NS_PREFIX_IS_SCOPE))
470 * This node might not be a actual "scope" node (such as a
471 * Device/Method, etc.) It could be a Package or other object
472 * node. Backup up the tree to find the containing scope node.
474 while (!AcpiNsOpensScope (PrefixNode->Type) &&
475 PrefixNode->Type != ACPI_TYPE_ANY)
477 PrefixNode = PrefixNode->Parent;
482 /* Save type. TBD: may be no longer necessary */
484 TypeToCheckFor = Type;
487 * Begin examination of the actual pathname
491 /* A Null NamePath is allowed and refers to the root */
494 ThisNode = AcpiGbl_RootNode;
497 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
498 "Null Pathname (Zero segments), Flags=%X\n", Flags));
503 * Name pointer is valid (and must be in internal name format)
505 * Check for scope prefixes:
507 * As represented in the AML stream, a namepath consists of an
508 * optional scope prefix followed by a name segment part.
510 * If present, the scope prefix is either a Root Prefix (in
511 * which case the name is fully qualified), or one or more
512 * Parent Prefixes (in which case the name's scope is relative
513 * to the current scope).
515 if (*Path == (UINT8) AML_ROOT_PREFIX)
517 /* Pathname is fully qualified, start from the root */
519 ThisNode = AcpiGbl_RootNode;
520 SearchParentFlag = ACPI_NS_NO_UPSEARCH;
522 /* Point to name segment part */
526 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
527 "Path is absolute from root [%p]\n", ThisNode));
531 /* Pathname is relative to current scope, start there */
533 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
534 "Searching relative to prefix scope [%4.4s] (%p)\n",
535 AcpiUtGetNodeName (PrefixNode), PrefixNode));
538 * Handle multiple Parent Prefixes (carat) by just getting
539 * the parent node for each prefix instance.
541 ThisNode = PrefixNode;
543 while (*Path == (UINT8) AML_PARENT_PREFIX)
545 /* Name is fully qualified, no search rules apply */
547 SearchParentFlag = ACPI_NS_NO_UPSEARCH;
550 * Point past this prefix to the name segment
551 * part or the next Parent Prefix
555 /* Backup to the parent node */
558 ThisNode = ThisNode->Parent;
562 * Current scope has no parent scope. Externalize
563 * the internal path for error message.
565 Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, Pathname,
566 NULL, &ExternalPath);
567 if (ACPI_SUCCESS (Status))
569 ACPI_ERROR ((AE_INFO,
570 "%s: Path has too many parent prefixes (^)",
573 ACPI_FREE (ExternalPath);
576 return_ACPI_STATUS (AE_NOT_FOUND);
580 if (SearchParentFlag == ACPI_NS_NO_UPSEARCH)
582 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
583 "Search scope is [%4.4s], path has %u carat(s)\n",
584 AcpiUtGetNodeName (ThisNode), NumCarats));
589 * Determine the number of ACPI name segments in this pathname.
591 * The segment part consists of either:
592 * - A Null name segment (0)
593 * - A DualNamePrefix followed by two 4-byte name segments
594 * - A MultiNamePrefix followed by a byte indicating the
595 * number of segments and the segments themselves.
596 * - A single 4-byte name segment
598 * Examine the name prefix opcode, if any, to determine the number of
605 * Null name after a root or parent prefixes. We already
606 * have the correct target node and there are no name segments.
609 Type = ThisNode->Type;
611 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
612 "Prefix-only Pathname (Zero name segments), Flags=%X\n",
616 case AML_DUAL_NAME_PREFIX:
618 /* More than one NameSeg, search rules do not apply */
620 SearchParentFlag = ACPI_NS_NO_UPSEARCH;
622 /* Two segments, point to first name segment */
627 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
628 "Dual Pathname (2 segments, Flags=%X)\n", Flags));
631 case AML_MULTI_NAME_PREFIX:
633 /* More than one NameSeg, search rules do not apply */
635 SearchParentFlag = ACPI_NS_NO_UPSEARCH;
637 /* Extract segment count, point to first name segment */
640 NumSegments = (UINT32) (UINT8) *Path;
643 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
644 "Multi Pathname (%u Segments, Flags=%X)\n",
645 NumSegments, Flags));
650 * Not a Null name, no Dual or Multi prefix, hence there is
651 * only one name segment and Pathname is already pointing to it.
655 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
656 "Simple Pathname (1 segment, Flags=%X)\n", Flags));
660 ACPI_DEBUG_EXEC (AcpiNsPrintPathname (NumSegments, Path));
665 * Search namespace for each segment of the name. Loop through and
666 * verify (or add to the namespace) each name segment.
668 * The object type is significant only at the last name
669 * segment. (We don't care about the types along the path, only
670 * the type of the final target object.)
672 ThisSearchType = ACPI_TYPE_ANY;
673 CurrentNode = ThisNode;
675 while (NumSegments && CurrentNode)
680 /* This is the last segment, enable typechecking */
682 ThisSearchType = Type;
685 * Only allow automatic parent search (search rules) if the caller
686 * requested it AND we have a single, non-fully-qualified NameSeg
688 if ((SearchParentFlag != ACPI_NS_NO_UPSEARCH) &&
689 (Flags & ACPI_NS_SEARCH_PARENT))
691 LocalFlags |= ACPI_NS_SEARCH_PARENT;
694 /* Set error flag according to caller */
696 if (Flags & ACPI_NS_ERROR_IF_FOUND)
698 LocalFlags |= ACPI_NS_ERROR_IF_FOUND;
701 /* Set override flag according to caller */
703 if (Flags & ACPI_NS_OVERRIDE_IF_FOUND)
705 LocalFlags |= ACPI_NS_OVERRIDE_IF_FOUND;
709 /* Handle opcodes that create a new NameSeg via a full NamePath */
711 LocalInterpreterMode = InterpreterMode;
712 if ((Flags & ACPI_NS_PREFIX_MUST_EXIST) && (NumSegments > 0))
714 /* Every element of the path must exist (except for the final NameSeg) */
716 LocalInterpreterMode = ACPI_IMODE_EXECUTE;
719 /* Extract one ACPI name from the front of the pathname */
721 ACPI_MOVE_32_TO_32 (&SimpleName, Path);
723 /* Try to find the single (4 character) ACPI name */
725 Status = AcpiNsSearchAndEnter (SimpleName, WalkState, CurrentNode,
726 LocalInterpreterMode, ThisSearchType, LocalFlags, &ThisNode);
727 if (ACPI_FAILURE (Status))
729 if (Status == AE_NOT_FOUND)
731 #if !defined ACPI_ASL_COMPILER /* Note: iASL reports this error by itself, not needed here */
732 if (Flags & ACPI_NS_PREFIX_MUST_EXIST)
734 AcpiOsPrintf (ACPI_MSG_BIOS_ERROR
735 "Object does not exist: %4.4s\n", &SimpleName);
738 /* Name not found in ACPI namespace */
740 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
741 "Name [%4.4s] not found in scope [%4.4s] %p\n",
742 (char *) &SimpleName, (char *) &CurrentNode->Name,
747 if ((Status == AE_ALREADY_EXISTS) &&
748 (ThisNode->Flags & ANOBJ_NODE_EARLY_INIT))
750 ThisNode->Flags &= ~ANOBJ_NODE_EARLY_INIT;
755 #ifdef ACPI_ASL_COMPILER
757 * If this ACPI name already exists within the namespace as an
758 * external declaration, then mark the external as a conflicting
759 * declaration and proceed to process the current node as if it did
760 * not exist in the namespace. If this node is not processed as
761 * normal, then it could cause improper namespace resolution
762 * by failing to open a new scope.
764 if (AcpiGbl_DisasmFlag &&
765 (Status == AE_ALREADY_EXISTS) &&
766 ((ThisNode->Flags & ANOBJ_IS_EXTERNAL) ||
767 (WalkState && WalkState->Opcode == AML_EXTERNAL_OP)))
769 ThisNode->Flags &= ~ANOBJ_IS_EXTERNAL;
770 ThisNode->Type = (UINT8)ThisSearchType;
771 if (WalkState->Opcode != AML_EXTERNAL_OP)
773 AcpiDmMarkExternalConflict (ThisNode);
779 *ReturnNode = ThisNode;
780 return_ACPI_STATUS (Status);
783 /* More segments to follow? */
788 * If we have an alias to an object that opens a scope (such as a
789 * device or processor), we need to dereference the alias here so
790 * that we can access any children of the original node (via the
791 * remaining segments).
793 if (ThisNode->Type == ACPI_TYPE_LOCAL_ALIAS)
795 if (!ThisNode->Object)
797 return_ACPI_STATUS (AE_NOT_EXIST);
800 if (AcpiNsOpensScope (((ACPI_NAMESPACE_NODE *)
801 ThisNode->Object)->Type))
803 ThisNode = (ACPI_NAMESPACE_NODE *) ThisNode->Object;
808 /* Special handling for the last segment (NumSegments == 0) */
813 * Sanity typecheck of the target object:
815 * If 1) This is the last segment (NumSegments == 0)
816 * 2) And we are looking for a specific type
817 * (Not checking for TYPE_ANY)
818 * 3) Which is not an alias
819 * 4) Which is not a local type (TYPE_SCOPE)
820 * 5) And the type of target object is known (not TYPE_ANY)
821 * 6) And target object does not match what we are looking for
823 * Then we have a type mismatch. Just warn and ignore it.
825 if ((TypeToCheckFor != ACPI_TYPE_ANY) &&
826 (TypeToCheckFor != ACPI_TYPE_LOCAL_ALIAS) &&
827 (TypeToCheckFor != ACPI_TYPE_LOCAL_METHOD_ALIAS) &&
828 (TypeToCheckFor != ACPI_TYPE_LOCAL_SCOPE) &&
829 (ThisNode->Type != ACPI_TYPE_ANY) &&
830 (ThisNode->Type != TypeToCheckFor))
832 /* Complain about a type mismatch */
834 ACPI_WARNING ((AE_INFO,
835 "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)",
836 ACPI_CAST_PTR (char, &SimpleName),
837 AcpiUtGetTypeName (ThisNode->Type),
838 AcpiUtGetTypeName (TypeToCheckFor)));
842 * If this is the last name segment and we are not looking for a
843 * specific type, but the type of found object is known, use that
844 * type to (later) see if it opens a scope.
846 if (Type == ACPI_TYPE_ANY)
848 Type = ThisNode->Type;
852 /* Point to next name segment and make this node current */
854 Path += ACPI_NAME_SIZE;
855 CurrentNode = ThisNode;
858 /* Always check if we need to open a new scope */
860 if (!(Flags & ACPI_NS_DONT_OPEN_SCOPE) && (WalkState))
863 * If entry is a type which opens a scope, push the new scope on the
866 if (AcpiNsOpensScope (Type))
868 Status = AcpiDsScopeStackPush (ThisNode, Type, WalkState);
869 if (ACPI_FAILURE (Status))
871 return_ACPI_STATUS (Status);
877 if (Flags & ACPI_NS_EARLY_INIT)
879 ThisNode->Flags |= ANOBJ_NODE_EARLY_INIT;
883 *ReturnNode = ThisNode;
884 return_ACPI_STATUS (AE_OK);