1 /*******************************************************************************
3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace
5 ******************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2018, 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 *****************************************************************************/
153 #include "accommon.h"
155 #include "acnamesp.h"
156 #include "acdispat.h"
158 #ifdef ACPI_ASL_COMPILER
159 #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
;
426 ACPI_FUNCTION_TRACE (NsLookup
);
431 return_ACPI_STATUS (AE_BAD_PARAMETER
);
435 ~(ACPI_NS_ERROR_IF_FOUND
| ACPI_NS_OVERRIDE_IF_FOUND
|
436 ACPI_NS_SEARCH_PARENT
);
437 *ReturnNode
= ACPI_ENTRY_NOT_FOUND
;
438 AcpiGbl_NsLookupCount
++;
440 if (!AcpiGbl_RootNode
)
442 return_ACPI_STATUS (AE_NO_NAMESPACE
);
445 /* Get the prefix scope. A null scope means use the root scope */
448 (!ScopeInfo
->Scope
.Node
))
450 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES
,
451 "Null scope prefix, using root node (%p)\n",
454 PrefixNode
= AcpiGbl_RootNode
;
458 PrefixNode
= ScopeInfo
->Scope
.Node
;
459 if (ACPI_GET_DESCRIPTOR_TYPE (PrefixNode
) != ACPI_DESC_TYPE_NAMED
)
461 ACPI_ERROR ((AE_INFO
, "%p is not a namespace node [%s]",
462 PrefixNode
, AcpiUtGetDescriptorName (PrefixNode
)));
463 return_ACPI_STATUS (AE_AML_INTERNAL
);
466 if (!(Flags
& ACPI_NS_PREFIX_IS_SCOPE
))
469 * This node might not be a actual "scope" node (such as a
470 * Device/Method, etc.) It could be a Package or other object
471 * node. Backup up the tree to find the containing scope node.
473 while (!AcpiNsOpensScope (PrefixNode
->Type
) &&
474 PrefixNode
->Type
!= ACPI_TYPE_ANY
)
476 PrefixNode
= PrefixNode
->Parent
;
481 /* Save type. TBD: may be no longer necessary */
483 TypeToCheckFor
= Type
;
486 * Begin examination of the actual pathname
490 /* A Null NamePath is allowed and refers to the root */
493 ThisNode
= AcpiGbl_RootNode
;
496 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES
,
497 "Null Pathname (Zero segments), Flags=%X\n", Flags
));
502 * Name pointer is valid (and must be in internal name format)
504 * Check for scope prefixes:
506 * As represented in the AML stream, a namepath consists of an
507 * optional scope prefix followed by a name segment part.
509 * If present, the scope prefix is either a Root Prefix (in
510 * which case the name is fully qualified), or one or more
511 * Parent Prefixes (in which case the name's scope is relative
512 * to the current scope).
514 if (*Path
== (UINT8
) AML_ROOT_PREFIX
)
516 /* Pathname is fully qualified, start from the root */
518 ThisNode
= AcpiGbl_RootNode
;
519 SearchParentFlag
= ACPI_NS_NO_UPSEARCH
;
521 /* Point to name segment part */
525 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES
,
526 "Path is absolute from root [%p]\n", ThisNode
));
530 /* Pathname is relative to current scope, start there */
532 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES
,
533 "Searching relative to prefix scope [%4.4s] (%p)\n",
534 AcpiUtGetNodeName (PrefixNode
), PrefixNode
));
537 * Handle multiple Parent Prefixes (carat) by just getting
538 * the parent node for each prefix instance.
540 ThisNode
= PrefixNode
;
542 while (*Path
== (UINT8
) AML_PARENT_PREFIX
)
544 /* Name is fully qualified, no search rules apply */
546 SearchParentFlag
= ACPI_NS_NO_UPSEARCH
;
549 * Point past this prefix to the name segment
550 * part or the next Parent Prefix
554 /* Backup to the parent node */
557 ThisNode
= ThisNode
->Parent
;
561 * Current scope has no parent scope. Externalize
562 * the internal path for error message.
564 Status
= AcpiNsExternalizeName (ACPI_UINT32_MAX
, Pathname
,
565 NULL
, &ExternalPath
);
566 if (ACPI_SUCCESS (Status
))
568 ACPI_ERROR ((AE_INFO
,
569 "%s: Path has too many parent prefixes (^)",
572 ACPI_FREE (ExternalPath
);
575 return_ACPI_STATUS (AE_NOT_FOUND
);
579 if (SearchParentFlag
== ACPI_NS_NO_UPSEARCH
)
581 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES
,
582 "Search scope is [%4.4s], path has %u carat(s)\n",
583 AcpiUtGetNodeName (ThisNode
), NumCarats
));
588 * Determine the number of ACPI name segments in this pathname.
590 * The segment part consists of either:
591 * - A Null name segment (0)
592 * - A DualNamePrefix followed by two 4-byte name segments
593 * - A MultiNamePrefix followed by a byte indicating the
594 * number of segments and the segments themselves.
595 * - A single 4-byte name segment
597 * Examine the name prefix opcode, if any, to determine the number of
604 * Null name after a root or parent prefixes. We already
605 * have the correct target node and there are no name segments.
608 Type
= ThisNode
->Type
;
610 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES
,
611 "Prefix-only Pathname (Zero name segments), Flags=%X\n",
615 case AML_DUAL_NAME_PREFIX
:
617 /* More than one NameSeg, search rules do not apply */
619 SearchParentFlag
= ACPI_NS_NO_UPSEARCH
;
621 /* Two segments, point to first name segment */
626 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES
,
627 "Dual Pathname (2 segments, Flags=%X)\n", Flags
));
630 case AML_MULTI_NAME_PREFIX
:
632 /* More than one NameSeg, search rules do not apply */
634 SearchParentFlag
= ACPI_NS_NO_UPSEARCH
;
636 /* Extract segment count, point to first name segment */
639 NumSegments
= (UINT32
) (UINT8
) *Path
;
642 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES
,
643 "Multi Pathname (%u Segments, Flags=%X)\n",
644 NumSegments
, Flags
));
649 * Not a Null name, no Dual or Multi prefix, hence there is
650 * only one name segment and Pathname is already pointing to it.
654 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES
,
655 "Simple Pathname (1 segment, Flags=%X)\n", Flags
));
659 ACPI_DEBUG_EXEC (AcpiNsPrintPathname (NumSegments
, Path
));
664 * Search namespace for each segment of the name. Loop through and
665 * verify (or add to the namespace) each name segment.
667 * The object type is significant only at the last name
668 * segment. (We don't care about the types along the path, only
669 * the type of the final target object.)
671 ThisSearchType
= ACPI_TYPE_ANY
;
672 CurrentNode
= ThisNode
;
673 while (NumSegments
&& CurrentNode
)
678 /* This is the last segment, enable typechecking */
680 ThisSearchType
= Type
;
683 * Only allow automatic parent search (search rules) if the caller
684 * requested it AND we have a single, non-fully-qualified NameSeg
686 if ((SearchParentFlag
!= ACPI_NS_NO_UPSEARCH
) &&
687 (Flags
& ACPI_NS_SEARCH_PARENT
))
689 LocalFlags
|= ACPI_NS_SEARCH_PARENT
;
692 /* Set error flag according to caller */
694 if (Flags
& ACPI_NS_ERROR_IF_FOUND
)
696 LocalFlags
|= ACPI_NS_ERROR_IF_FOUND
;
699 /* Set override flag according to caller */
701 if (Flags
& ACPI_NS_OVERRIDE_IF_FOUND
)
703 LocalFlags
|= ACPI_NS_OVERRIDE_IF_FOUND
;
707 /* Extract one ACPI name from the front of the pathname */
709 ACPI_MOVE_32_TO_32 (&SimpleName
, Path
);
711 /* Try to find the single (4 character) ACPI name */
713 Status
= AcpiNsSearchAndEnter (SimpleName
, WalkState
, CurrentNode
,
714 InterpreterMode
, ThisSearchType
, LocalFlags
, &ThisNode
);
715 if (ACPI_FAILURE (Status
))
717 if (Status
== AE_NOT_FOUND
)
719 /* Name not found in ACPI namespace */
721 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES
,
722 "Name [%4.4s] not found in scope [%4.4s] %p\n",
723 (char *) &SimpleName
, (char *) &CurrentNode
->Name
,
727 #ifdef ACPI_ASL_COMPILER
729 * If this ACPI name already exists within the namespace as an
730 * external declaration, then mark the external as a conflicting
731 * declaration and proceed to process the current node as if it did
732 * not exist in the namespace. If this node is not processed as
733 * normal, then it could cause improper namespace resolution
734 * by failing to open a new scope.
736 if (AcpiGbl_DisasmFlag
&&
737 (Status
== AE_ALREADY_EXISTS
) &&
738 ((ThisNode
->Flags
& ANOBJ_IS_EXTERNAL
) ||
739 (WalkState
&& WalkState
->Opcode
== AML_EXTERNAL_OP
)))
741 ThisNode
->Flags
&= ~ANOBJ_IS_EXTERNAL
;
742 ThisNode
->Type
= (UINT8
)ThisSearchType
;
743 if (WalkState
->Opcode
!= AML_EXTERNAL_OP
)
745 AcpiDmMarkExternalConflict (ThisNode
);
751 *ReturnNode
= ThisNode
;
752 return_ACPI_STATUS (Status
);
755 /* More segments to follow? */
760 * If we have an alias to an object that opens a scope (such as a
761 * device or processor), we need to dereference the alias here so
762 * that we can access any children of the original node (via the
763 * remaining segments).
765 if (ThisNode
->Type
== ACPI_TYPE_LOCAL_ALIAS
)
767 if (!ThisNode
->Object
)
769 return_ACPI_STATUS (AE_NOT_EXIST
);
772 if (AcpiNsOpensScope (((ACPI_NAMESPACE_NODE
*)
773 ThisNode
->Object
)->Type
))
775 ThisNode
= (ACPI_NAMESPACE_NODE
*) ThisNode
->Object
;
780 /* Special handling for the last segment (NumSegments == 0) */
784 #ifdef ACPI_ASL_COMPILER
785 if (!AcpiGbl_DisasmFlag
&& (ThisNode
->Flags
& ANOBJ_IS_EXTERNAL
))
787 ThisNode
->Flags
&= ~IMPLICIT_EXTERNAL
;
792 * Sanity typecheck of the target object:
794 * If 1) This is the last segment (NumSegments == 0)
795 * 2) And we are looking for a specific type
796 * (Not checking for TYPE_ANY)
797 * 3) Which is not an alias
798 * 4) Which is not a local type (TYPE_SCOPE)
799 * 5) And the type of target object is known (not TYPE_ANY)
800 * 6) And target object does not match what we are looking for
802 * Then we have a type mismatch. Just warn and ignore it.
804 if ((TypeToCheckFor
!= ACPI_TYPE_ANY
) &&
805 (TypeToCheckFor
!= ACPI_TYPE_LOCAL_ALIAS
) &&
806 (TypeToCheckFor
!= ACPI_TYPE_LOCAL_METHOD_ALIAS
) &&
807 (TypeToCheckFor
!= ACPI_TYPE_LOCAL_SCOPE
) &&
808 (ThisNode
->Type
!= ACPI_TYPE_ANY
) &&
809 (ThisNode
->Type
!= TypeToCheckFor
))
811 /* Complain about a type mismatch */
813 ACPI_WARNING ((AE_INFO
,
814 "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)",
815 ACPI_CAST_PTR (char, &SimpleName
),
816 AcpiUtGetTypeName (ThisNode
->Type
),
817 AcpiUtGetTypeName (TypeToCheckFor
)));
821 * If this is the last name segment and we are not looking for a
822 * specific type, but the type of found object is known, use that
823 * type to (later) see if it opens a scope.
825 if (Type
== ACPI_TYPE_ANY
)
827 Type
= ThisNode
->Type
;
831 /* Point to next name segment and make this node current */
833 Path
+= ACPI_NAME_SIZE
;
834 CurrentNode
= ThisNode
;
837 /* Always check if we need to open a new scope */
839 if (!(Flags
& ACPI_NS_DONT_OPEN_SCOPE
) && (WalkState
))
842 * If entry is a type which opens a scope, push the new scope on the
845 if (AcpiNsOpensScope (Type
))
847 Status
= AcpiDsScopeStackPush (ThisNode
, Type
, WalkState
);
848 if (ACPI_FAILURE (Status
))
850 return_ACPI_STATUS (Status
);
855 *ReturnNode
= ThisNode
;
856 return_ACPI_STATUS (AE_OK
);