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 - 2014, 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 "acpi.h"
48 #include "accommon.h"
49 #include "acnamesp.h"
50 #include "amlcode.h"
51
52 #define _COMPONENT ACPI_NAMESPACE
53 ACPI_MODULE_NAME ("nsutils")
54
55 /* Local prototypes */
56
57 #ifdef ACPI_OBSOLETE_FUNCTIONS
58 ACPI_NAME
59 AcpiNsFindParentName (
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
76 void
77 AcpiNsPrintNodePathname (
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
121 ACPI_OBJECT_TYPE
122 AcpiNsGetType (
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
151 UINT32
152 AcpiNsLocal (
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
184 void
185 AcpiNsGetInternalNameLength (
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
267 ACPI_STATUS
268 AcpiNsBuildInternalName (
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
405 ACPI_STATUS
406 AcpiNsInternalizeName (
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
470 ACPI_STATUS
471 AcpiNsExternalizeName (
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
654 ACPI_NAMESPACE_NODE *
655 AcpiNsValidateHandle (
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
692 void
693 AcpiNsTerminate (
694 void)
695 {
696 ACPI_STATUS Status;
697
698
699 ACPI_FUNCTION_TRACE (NsTerminate);
700
701
702 /*
703 * Free the entire namespace -- all nodes and all objects
704 * attached to the nodes
705 */
706 AcpiNsDeleteNamespaceSubtree (AcpiGbl_RootNode);
707
708 /* Delete any objects attached to the root node */
709
710 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
711 if (ACPI_FAILURE (Status))
712 {
713 return_VOID;
714 }
715
716 AcpiNsDeleteNode (AcpiGbl_RootNode);
717 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
718
719 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Namespace freed\n"));
720 return_VOID;
721 }
722
723
724 /*******************************************************************************
725 *
726 * FUNCTION: AcpiNsOpensScope
727 *
728 * PARAMETERS: Type - A valid namespace type
729 *
730 * RETURN: NEWSCOPE if the passed type "opens a name scope" according
731 * to the ACPI specification, else 0
732 *
733 ******************************************************************************/
734
735 UINT32
736 AcpiNsOpensScope (
737 ACPI_OBJECT_TYPE Type)
738 {
739 ACPI_FUNCTION_ENTRY ();
740
741
742 if (Type > ACPI_TYPE_LOCAL_MAX)
743 {
744 /* type code out of range */
745
746 ACPI_WARNING ((AE_INFO, "Invalid Object Type 0x%X", Type));
747 return (ACPI_NS_NORMAL);
748 }
749
750 return (((UINT32) AcpiGbl_NsProperties[Type]) & ACPI_NS_NEWSCOPE);
751 }
752
753
754 /*******************************************************************************
755 *
756 * FUNCTION: AcpiNsGetNode
757 *
758 * PARAMETERS: *Pathname - Name to be found, in external (ASL) format. The
759 * \ (backslash) and ^ (carat) prefixes, and the
760 * . (period) to separate segments are supported.
761 * PrefixNode - Root of subtree to be searched, or NS_ALL for the
762 * root of the name space. If Name is fully
763 * qualified (first INT8 is '\'), the passed value
764 * of Scope will not be accessed.
765 * Flags - Used to indicate whether to perform upsearch or
766 * not.
767 * ReturnNode - Where the Node is returned
768 *
769 * DESCRIPTION: Look up a name relative to a given scope and return the
770 * corresponding Node. NOTE: Scope can be null.
771 *
772 * MUTEX: Locks namespace
773 *
774 ******************************************************************************/
775
776 ACPI_STATUS
777 AcpiNsGetNode (
778 ACPI_NAMESPACE_NODE *PrefixNode,
779 const char *Pathname,
780 UINT32 Flags,
781 ACPI_NAMESPACE_NODE **ReturnNode)
782 {
783 ACPI_GENERIC_STATE ScopeInfo;
784 ACPI_STATUS Status;
785 char *InternalPath;
786
787
788 ACPI_FUNCTION_TRACE_PTR (NsGetNode, ACPI_CAST_PTR (char, Pathname));
789
790
791 /* Simplest case is a null pathname */
792
793 if (!Pathname)
794 {
795 *ReturnNode = PrefixNode;
796 if (!PrefixNode)
797 {
798 *ReturnNode = AcpiGbl_RootNode;
799 }
800 return_ACPI_STATUS (AE_OK);
801 }
802
803 /* Quick check for a reference to the root */
804
805 if (ACPI_IS_ROOT_PREFIX (Pathname[0]) && (!Pathname[1]))
806 {
807 *ReturnNode = AcpiGbl_RootNode;
808 return_ACPI_STATUS (AE_OK);
809 }
810
811 /* Convert path to internal representation */
812
813 Status = AcpiNsInternalizeName (Pathname, &InternalPath);
814 if (ACPI_FAILURE (Status))
815 {
816 return_ACPI_STATUS (Status);
817 }
818
819 /* Must lock namespace during lookup */
820
821 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
822 if (ACPI_FAILURE (Status))
823 {
824 goto Cleanup;
825 }
826
827 /* Setup lookup scope (search starting point) */
828
829 ScopeInfo.Scope.Node = PrefixNode;
830
831 /* Lookup the name in the namespace */
832
833 Status = AcpiNsLookup (&ScopeInfo, InternalPath, ACPI_TYPE_ANY,
834 ACPI_IMODE_EXECUTE, (Flags | ACPI_NS_DONT_OPEN_SCOPE),
835 NULL, ReturnNode);
836 if (ACPI_FAILURE (Status))
837 {
838 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s, %s\n",
839 Pathname, AcpiFormatException (Status)));
840 }
841
842 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
843
844 Cleanup:
845 ACPI_FREE (InternalPath);
846 return_ACPI_STATUS (Status);
847 }