1/******************************************************************************
2 *
3 * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
4 *                        parents and siblings and Scope manipulation
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2013, Intel Corp.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions, and the following disclaimer,
17 *    without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 *    substantially similar to the "NO WARRANTY" disclaimer below
20 *    ("Disclaimer") and any redistribution must be conditioned upon
21 *    including a substantially similar Disclaimer requirement for further
22 *    binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 *    of any contributors may be used to endorse or promote products derived
25 *    from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
30 *
31 * NO WARRANTY
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45#define __NSUTILS_C__
46
47#include <contrib/dev/acpica/include/acpi.h>
48#include <contrib/dev/acpica/include/accommon.h>
49#include <contrib/dev/acpica/include/acnamesp.h>
50#include <contrib/dev/acpica/include/amlcode.h>
51
52#define _COMPONENT          ACPI_NAMESPACE
53        ACPI_MODULE_NAME    ("nsutils")
54
55/* Local prototypes */
56
57#ifdef ACPI_OBSOLETE_FUNCTIONS
58ACPI_NAME
59AcpiNsFindParentName (
60    ACPI_NAMESPACE_NODE     *NodeToSearch);
61#endif
62
63
64/*******************************************************************************
65 *
66 * FUNCTION:    AcpiNsPrintNodePathname
67 *
68 * PARAMETERS:  Node            - Object
69 *              Message         - Prefix message
70 *
71 * DESCRIPTION: Print an object's full namespace pathname
72 *              Manages allocation/freeing of a pathname buffer
73 *
74 ******************************************************************************/
75
76void
77AcpiNsPrintNodePathname (
78    ACPI_NAMESPACE_NODE     *Node,
79    const char              *Message)
80{
81    ACPI_BUFFER             Buffer;
82    ACPI_STATUS             Status;
83
84
85    if (!Node)
86    {
87        AcpiOsPrintf ("[NULL NAME]");
88        return;
89    }
90
91    /* Convert handle to full pathname and print it (with supplied message) */
92
93    Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
94
95    Status = AcpiNsHandleToPathname (Node, &Buffer);
96    if (ACPI_SUCCESS (Status))
97    {
98        if (Message)
99        {
100            AcpiOsPrintf ("%s ", Message);
101        }
102
103        AcpiOsPrintf ("[%s] (Node %p)", (char *) Buffer.Pointer, Node);
104        ACPI_FREE (Buffer.Pointer);
105    }
106}
107
108
109/*******************************************************************************
110 *
111 * FUNCTION:    AcpiNsGetType
112 *
113 * PARAMETERS:  Node        - Parent Node to be examined
114 *
115 * RETURN:      Type field from Node whose handle is passed
116 *
117 * DESCRIPTION: Return the type of a Namespace node
118 *
119 ******************************************************************************/
120
121ACPI_OBJECT_TYPE
122AcpiNsGetType (
123    ACPI_NAMESPACE_NODE     *Node)
124{
125    ACPI_FUNCTION_TRACE (NsGetType);
126
127
128    if (!Node)
129    {
130        ACPI_WARNING ((AE_INFO, "Null Node parameter"));
131        return_UINT8 (ACPI_TYPE_ANY);
132    }
133
134    return_UINT8 (Node->Type);
135}
136
137
138/*******************************************************************************
139 *
140 * FUNCTION:    AcpiNsLocal
141 *
142 * PARAMETERS:  Type        - A namespace object type
143 *
144 * RETURN:      LOCAL if names must be found locally in objects of the
145 *              passed type, 0 if enclosing scopes should be searched
146 *
147 * DESCRIPTION: Returns scope rule for the given object type.
148 *
149 ******************************************************************************/
150
151UINT32
152AcpiNsLocal (
153    ACPI_OBJECT_TYPE        Type)
154{
155    ACPI_FUNCTION_TRACE (NsLocal);
156
157
158    if (!AcpiUtValidObjectType (Type))
159    {
160        /* Type code out of range  */
161
162        ACPI_WARNING ((AE_INFO, "Invalid Object Type 0x%X", Type));
163        return_UINT32 (ACPI_NS_NORMAL);
164    }
165
166    return_UINT32 (AcpiGbl_NsProperties[Type] & ACPI_NS_LOCAL);
167}
168
169
170/*******************************************************************************
171 *
172 * FUNCTION:    AcpiNsGetInternalNameLength
173 *
174 * PARAMETERS:  Info            - Info struct initialized with the
175 *                                external name pointer.
176 *
177 * RETURN:      None
178 *
179 * DESCRIPTION: Calculate the length of the internal (AML) namestring
180 *              corresponding to the external (ASL) namestring.
181 *
182 ******************************************************************************/
183
184void
185AcpiNsGetInternalNameLength (
186    ACPI_NAMESTRING_INFO    *Info)
187{
188    const char              *NextExternalChar;
189    UINT32                  i;
190
191
192    ACPI_FUNCTION_ENTRY ();
193
194
195    NextExternalChar = Info->ExternalName;
196    Info->NumCarats = 0;
197    Info->NumSegments = 0;
198    Info->FullyQualified = FALSE;
199
200    /*
201     * For the internal name, the required length is 4 bytes per segment, plus
202     * 1 each for RootPrefix, MultiNamePrefixOp, segment count, trailing null
203     * (which is not really needed, but no there's harm in putting it there)
204     *
205     * strlen() + 1 covers the first NameSeg, which has no path separator
206     */
207    if (ACPI_IS_ROOT_PREFIX (*NextExternalChar))
208    {
209        Info->FullyQualified = TRUE;
210        NextExternalChar++;
211
212        /* Skip redundant RootPrefix, like \\_SB.PCI0.SBRG.EC0 */
213
214        while (ACPI_IS_ROOT_PREFIX (*NextExternalChar))
215        {
216            NextExternalChar++;
217        }
218    }
219    else
220    {
221        /* Handle Carat prefixes */
222
223        while (ACPI_IS_PARENT_PREFIX (*NextExternalChar))
224        {
225            Info->NumCarats++;
226            NextExternalChar++;
227        }
228    }
229
230    /*
231     * Determine the number of ACPI name "segments" by counting the number of
232     * path separators within the string. Start with one segment since the
233     * segment count is [(# separators) + 1], and zero separators is ok.
234     */
235    if (*NextExternalChar)
236    {
237        Info->NumSegments = 1;
238        for (i = 0; NextExternalChar[i]; i++)
239        {
240            if (ACPI_IS_PATH_SEPARATOR (NextExternalChar[i]))
241            {
242                Info->NumSegments++;
243            }
244        }
245    }
246
247    Info->Length = (ACPI_NAME_SIZE * Info->NumSegments) +
248                    4 + Info->NumCarats;
249
250    Info->NextExternalChar = NextExternalChar;
251}
252
253
254/*******************************************************************************
255 *
256 * FUNCTION:    AcpiNsBuildInternalName
257 *
258 * PARAMETERS:  Info            - Info struct fully initialized
259 *
260 * RETURN:      Status
261 *
262 * DESCRIPTION: Construct the internal (AML) namestring
263 *              corresponding to the external (ASL) namestring.
264 *
265 ******************************************************************************/
266
267ACPI_STATUS
268AcpiNsBuildInternalName (
269    ACPI_NAMESTRING_INFO    *Info)
270{
271    UINT32                  NumSegments = Info->NumSegments;
272    char                    *InternalName = Info->InternalName;
273    const char              *ExternalName = Info->NextExternalChar;
274    char                    *Result = NULL;
275    UINT32                  i;
276
277
278    ACPI_FUNCTION_TRACE (NsBuildInternalName);
279
280
281    /* Setup the correct prefixes, counts, and pointers */
282
283    if (Info->FullyQualified)
284    {
285        InternalName[0] = AML_ROOT_PREFIX;
286
287        if (NumSegments <= 1)
288        {
289            Result = &InternalName[1];
290        }
291        else if (NumSegments == 2)
292        {
293            InternalName[1] = AML_DUAL_NAME_PREFIX;
294            Result = &InternalName[2];
295        }
296        else
297        {
298            InternalName[1] = AML_MULTI_NAME_PREFIX_OP;
299            InternalName[2] = (char) NumSegments;
300            Result = &InternalName[3];
301        }
302    }
303    else
304    {
305        /*
306         * Not fully qualified.
307         * Handle Carats first, then append the name segments
308         */
309        i = 0;
310        if (Info->NumCarats)
311        {
312            for (i = 0; i < Info->NumCarats; i++)
313            {
314                InternalName[i] = AML_PARENT_PREFIX;
315            }
316        }
317
318        if (NumSegments <= 1)
319        {
320            Result = &InternalName[i];
321        }
322        else if (NumSegments == 2)
323        {
324            InternalName[i] = AML_DUAL_NAME_PREFIX;
325            Result = &InternalName[(ACPI_SIZE) i+1];
326        }
327        else
328        {
329            InternalName[i] = AML_MULTI_NAME_PREFIX_OP;
330            InternalName[(ACPI_SIZE) i+1] = (char) NumSegments;
331            Result = &InternalName[(ACPI_SIZE) i+2];
332        }
333    }
334
335    /* Build the name (minus path separators) */
336
337    for (; NumSegments; NumSegments--)
338    {
339        for (i = 0; i < ACPI_NAME_SIZE; i++)
340        {
341            if (ACPI_IS_PATH_SEPARATOR (*ExternalName) ||
342               (*ExternalName == 0))
343            {
344                /* Pad the segment with underscore(s) if segment is short */
345
346                Result[i] = '_';
347            }
348            else
349            {
350                /* Convert the character to uppercase and save it */
351
352                Result[i] = (char) ACPI_TOUPPER ((int) *ExternalName);
353                ExternalName++;
354            }
355        }
356
357        /* Now we must have a path separator, or the pathname is bad */
358
359        if (!ACPI_IS_PATH_SEPARATOR (*ExternalName) &&
360            (*ExternalName != 0))
361        {
362            return_ACPI_STATUS (AE_BAD_PATHNAME);
363        }
364
365        /* Move on the next segment */
366
367        ExternalName++;
368        Result += ACPI_NAME_SIZE;
369    }
370
371    /* Terminate the string */
372
373    *Result = 0;
374
375    if (Info->FullyQualified)
376    {
377        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (abs) \"\\%s\"\n",
378            InternalName, InternalName));
379    }
380    else
381    {
382        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
383            InternalName, InternalName));
384    }
385
386    return_ACPI_STATUS (AE_OK);
387}
388
389
390/*******************************************************************************
391 *
392 * FUNCTION:    AcpiNsInternalizeName
393 *
394 * PARAMETERS:  *ExternalName           - External representation of name
395 *              **Converted Name        - Where to return the resulting
396 *                                        internal represention of the name
397 *
398 * RETURN:      Status
399 *
400 * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
401 *              to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
402 *
403 *******************************************************************************/
404
405ACPI_STATUS
406AcpiNsInternalizeName (
407    const char              *ExternalName,
408    char                    **ConvertedName)
409{
410    char                    *InternalName;
411    ACPI_NAMESTRING_INFO    Info;
412    ACPI_STATUS             Status;
413
414
415    ACPI_FUNCTION_TRACE (NsInternalizeName);
416
417
418    if ((!ExternalName)      ||
419        (*ExternalName == 0) ||
420        (!ConvertedName))
421    {
422        return_ACPI_STATUS (AE_BAD_PARAMETER);
423    }
424
425    /* Get the length of the new internal name */
426
427    Info.ExternalName = ExternalName;
428    AcpiNsGetInternalNameLength (&Info);
429
430    /* We need a segment to store the internal  name */
431
432    InternalName = ACPI_ALLOCATE_ZEROED (Info.Length);
433    if (!InternalName)
434    {
435        return_ACPI_STATUS (AE_NO_MEMORY);
436    }
437
438    /* Build the name */
439
440    Info.InternalName = InternalName;
441    Status = AcpiNsBuildInternalName (&Info);
442    if (ACPI_FAILURE (Status))
443    {
444        ACPI_FREE (InternalName);
445        return_ACPI_STATUS (Status);
446    }
447
448    *ConvertedName = InternalName;
449    return_ACPI_STATUS (AE_OK);
450}
451
452
453/*******************************************************************************
454 *
455 * FUNCTION:    AcpiNsExternalizeName
456 *
457 * PARAMETERS:  InternalNameLength  - Lenth of the internal name below
458 *              InternalName        - Internal representation of name
459 *              ConvertedNameLength - Where the length is returned
460 *              ConvertedName       - Where the resulting external name
461 *                                    is returned
462 *
463 * RETURN:      Status
464 *
465 * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
466 *              to its external (printable) form (e.g. "\_PR_.CPU0")
467 *
468 ******************************************************************************/
469
470ACPI_STATUS
471AcpiNsExternalizeName (
472    UINT32                  InternalNameLength,
473    const char              *InternalName,
474    UINT32                  *ConvertedNameLength,
475    char                    **ConvertedName)
476{
477    UINT32                  NamesIndex = 0;
478    UINT32                  NumSegments = 0;
479    UINT32                  RequiredLength;
480    UINT32                  PrefixLength = 0;
481    UINT32                  i = 0;
482    UINT32                  j = 0;
483
484
485    ACPI_FUNCTION_TRACE (NsExternalizeName);
486
487
488    if (!InternalNameLength     ||
489        !InternalName           ||
490        !ConvertedName)
491    {
492        return_ACPI_STATUS (AE_BAD_PARAMETER);
493    }
494
495    /* Check for a prefix (one '\' | one or more '^') */
496
497    switch (InternalName[0])
498    {
499    case AML_ROOT_PREFIX:
500
501        PrefixLength = 1;
502        break;
503
504    case AML_PARENT_PREFIX:
505
506        for (i = 0; i < InternalNameLength; i++)
507        {
508            if (ACPI_IS_PARENT_PREFIX (InternalName[i]))
509            {
510                PrefixLength = i + 1;
511            }
512            else
513            {
514                break;
515            }
516        }
517
518        if (i == InternalNameLength)
519        {
520            PrefixLength = i;
521        }
522
523        break;
524
525    default:
526
527        break;
528    }
529
530    /*
531     * Check for object names. Note that there could be 0-255 of these
532     * 4-byte elements.
533     */
534    if (PrefixLength < InternalNameLength)
535    {
536        switch (InternalName[PrefixLength])
537        {
538        case AML_MULTI_NAME_PREFIX_OP:
539
540            /* <count> 4-byte names */
541
542            NamesIndex = PrefixLength + 2;
543            NumSegments = (UINT8)
544                InternalName[(ACPI_SIZE) PrefixLength + 1];
545            break;
546
547        case AML_DUAL_NAME_PREFIX:
548
549            /* Two 4-byte names */
550
551            NamesIndex = PrefixLength + 1;
552            NumSegments = 2;
553            break;
554
555        case 0:
556
557            /* NullName */
558
559            NamesIndex = 0;
560            NumSegments = 0;
561            break;
562
563        default:
564
565            /* one 4-byte name */
566
567            NamesIndex = PrefixLength;
568            NumSegments = 1;
569            break;
570        }
571    }
572
573    /*
574     * Calculate the length of ConvertedName, which equals the length
575     * of the prefix, length of all object names, length of any required
576     * punctuation ('.') between object names, plus the NULL terminator.
577     */
578    RequiredLength = PrefixLength + (4 * NumSegments) +
579                        ((NumSegments > 0) ? (NumSegments - 1) : 0) + 1;
580
581    /*
582     * Check to see if we're still in bounds. If not, there's a problem
583     * with InternalName (invalid format).
584     */
585    if (RequiredLength > InternalNameLength)
586    {
587        ACPI_ERROR ((AE_INFO, "Invalid internal name"));
588        return_ACPI_STATUS (AE_BAD_PATHNAME);
589    }
590
591    /* Build the ConvertedName */
592
593    *ConvertedName = ACPI_ALLOCATE_ZEROED (RequiredLength);
594    if (!(*ConvertedName))
595    {
596        return_ACPI_STATUS (AE_NO_MEMORY);
597    }
598
599    j = 0;
600
601    for (i = 0; i < PrefixLength; i++)
602    {
603        (*ConvertedName)[j++] = InternalName[i];
604    }
605
606    if (NumSegments > 0)
607    {
608        for (i = 0; i < NumSegments; i++)
609        {
610            if (i > 0)
611            {
612                (*ConvertedName)[j++] = '.';
613            }
614
615            /* Copy and validate the 4-char name segment */
616
617            ACPI_MOVE_NAME (&(*ConvertedName)[j], &InternalName[NamesIndex]);
618            AcpiUtRepairName (&(*ConvertedName)[j]);
619
620            j += ACPI_NAME_SIZE;
621            NamesIndex += ACPI_NAME_SIZE;
622        }
623    }
624
625    if (ConvertedNameLength)
626    {
627        *ConvertedNameLength = (UINT32) RequiredLength;
628    }
629
630    return_ACPI_STATUS (AE_OK);
631}
632
633
634/*******************************************************************************
635 *
636 * FUNCTION:    AcpiNsValidateHandle
637 *
638 * PARAMETERS:  Handle          - Handle to be validated and typecast to a
639 *                                namespace node.
640 *
641 * RETURN:      A pointer to a namespace node
642 *
643 * DESCRIPTION: Convert a namespace handle to a namespace node. Handles special
644 *              cases for the root node.
645 *
646 * NOTE: Real integer handles would allow for more verification
647 *       and keep all pointers within this subsystem - however this introduces
648 *       more overhead and has not been necessary to this point. Drivers
649 *       holding handles are typically notified before a node becomes invalid
650 *       due to a table unload.
651 *
652 ******************************************************************************/
653
654ACPI_NAMESPACE_NODE *
655AcpiNsValidateHandle (
656    ACPI_HANDLE             Handle)
657{
658
659    ACPI_FUNCTION_ENTRY ();
660
661
662    /* Parameter validation */
663
664    if ((!Handle) || (Handle == ACPI_ROOT_OBJECT))
665    {
666        return (AcpiGbl_RootNode);
667    }
668
669    /* We can at least attempt to verify the handle */
670
671    if (ACPI_GET_DESCRIPTOR_TYPE (Handle) != ACPI_DESC_TYPE_NAMED)
672    {
673        return (NULL);
674    }
675
676    return (ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Handle));
677}
678
679
680/*******************************************************************************
681 *
682 * FUNCTION:    AcpiNsTerminate
683 *
684 * PARAMETERS:  none
685 *
686 * RETURN:      none
687 *
688 * DESCRIPTION: free memory allocated for namespace and ACPI table storage.
689 *
690 ******************************************************************************/
691
692void
693AcpiNsTerminate (
694    void)
695{
696    ACPI_OPERAND_OBJECT     *ObjDesc;
697
698
699    ACPI_FUNCTION_TRACE (NsTerminate);
700
701
702    /*
703     * 1) Free the entire namespace -- all nodes and objects
704     *
705     * Delete all object descriptors attached to namepsace nodes
706     */
707    AcpiNsDeleteNamespaceSubtree (AcpiGbl_RootNode);
708
709    /* Detach any objects attached to the root */
710
711    ObjDesc = AcpiNsGetAttachedObject (AcpiGbl_RootNode);
712    if (ObjDesc)
713    {
714        AcpiNsDetachObject (AcpiGbl_RootNode);
715    }
716
717    ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Namespace freed\n"));
718    return_VOID;
719}
720
721
722/*******************************************************************************
723 *
724 * FUNCTION:    AcpiNsOpensScope
725 *
726 * PARAMETERS:  Type        - A valid namespace type
727 *
728 * RETURN:      NEWSCOPE if the passed type "opens a name scope" according
729 *              to the ACPI specification, else 0
730 *
731 ******************************************************************************/
732
733UINT32
734AcpiNsOpensScope (
735    ACPI_OBJECT_TYPE        Type)
736{
737    ACPI_FUNCTION_ENTRY ();
738
739
740    if (Type > ACPI_TYPE_LOCAL_MAX)
741    {
742        /* type code out of range  */
743
744        ACPI_WARNING ((AE_INFO, "Invalid Object Type 0x%X", Type));
745        return (ACPI_NS_NORMAL);
746    }
747
748    return (((UINT32) AcpiGbl_NsProperties[Type]) & ACPI_NS_NEWSCOPE);
749}
750
751
752/*******************************************************************************
753 *
754 * FUNCTION:    AcpiNsGetNode
755 *
756 * PARAMETERS:  *Pathname   - Name to be found, in external (ASL) format. The
757 *                            \ (backslash) and ^ (carat) prefixes, and the
758 *                            . (period) to separate segments are supported.
759 *              PrefixNode   - Root of subtree to be searched, or NS_ALL for the
760 *                            root of the name space. If Name is fully
761 *                            qualified (first INT8 is '\'), the passed value
762 *                            of Scope will not be accessed.
763 *              Flags       - Used to indicate whether to perform upsearch or
764 *                            not.
765 *              ReturnNode  - Where the Node is returned
766 *
767 * DESCRIPTION: Look up a name relative to a given scope and return the
768 *              corresponding Node. NOTE: Scope can be null.
769 *
770 * MUTEX:       Locks namespace
771 *
772 ******************************************************************************/
773
774ACPI_STATUS
775AcpiNsGetNode (
776    ACPI_NAMESPACE_NODE     *PrefixNode,
777    const char              *Pathname,
778    UINT32                  Flags,
779    ACPI_NAMESPACE_NODE     **ReturnNode)
780{
781    ACPI_GENERIC_STATE      ScopeInfo;
782    ACPI_STATUS             Status;
783    char                    *InternalPath;
784
785
786    ACPI_FUNCTION_TRACE_PTR (NsGetNode, ACPI_CAST_PTR (char, Pathname));
787
788
789    /* Simplest case is a null pathname */
790
791    if (!Pathname)
792    {
793        *ReturnNode = PrefixNode;
794        if (!PrefixNode)
795        {
796            *ReturnNode = AcpiGbl_RootNode;
797        }
798        return_ACPI_STATUS (AE_OK);
799    }
800
801    /* Quick check for a reference to the root */
802
803    if (ACPI_IS_ROOT_PREFIX (Pathname[0]) && (!Pathname[1]))
804    {
805        *ReturnNode = AcpiGbl_RootNode;
806        return_ACPI_STATUS (AE_OK);
807    }
808
809    /* Convert path to internal representation */
810
811    Status = AcpiNsInternalizeName (Pathname, &InternalPath);
812    if (ACPI_FAILURE (Status))
813    {
814        return_ACPI_STATUS (Status);
815    }
816
817    /* Must lock namespace during lookup */
818
819    Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
820    if (ACPI_FAILURE (Status))
821    {
822        goto Cleanup;
823    }
824
825    /* Setup lookup scope (search starting point) */
826
827    ScopeInfo.Scope.Node = PrefixNode;
828
829    /* Lookup the name in the namespace */
830
831    Status = AcpiNsLookup (&ScopeInfo, InternalPath, ACPI_TYPE_ANY,
832                ACPI_IMODE_EXECUTE, (Flags | ACPI_NS_DONT_OPEN_SCOPE),
833                NULL, ReturnNode);
834    if (ACPI_FAILURE (Status))
835    {
836        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s, %s\n",
837                Pathname, AcpiFormatException (Status)));
838    }
839
840    (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
841
842Cleanup:
843    ACPI_FREE (InternalPath);
844    return_ACPI_STATUS (Status);
845}
846