1 /*******************************************************************************
2 *
3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace
4 *
5 ******************************************************************************/
6
7 /******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
20 *
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65 *
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88 * PARTICULAR PURPOSE.
89 *
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97 * LIMITED REMEDY.
98 *
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
113 *
114 *****************************************************************************
115 *
116 * Alternatively, you may choose to be licensed under the terms of the
117 * following license:
118 *
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
121 * are met:
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.
133 *
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.
145 *
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.
149 *
150 *****************************************************************************/
151
152 #include "acpi.h"
153 #include "accommon.h"
154 #include "amlcode.h"
155 #include "acnamesp.h"
156 #include "acdispat.h"
157
158 #ifdef ACPI_ASL_COMPILER
159 #include "acdisasm.h"
160 #endif
161
162 #define _COMPONENT ACPI_NAMESPACE
163 ACPI_MODULE_NAME ("nsaccess")
164
165
166 /*******************************************************************************
167 *
168 * FUNCTION: AcpiNsRootInitialize
169 *
170 * PARAMETERS: None
171 *
172 * RETURN: Status
173 *
174 * DESCRIPTION: Allocate and initialize the default root named objects
175 *
176 * MUTEX: Locks namespace for entire execution
177 *
178 ******************************************************************************/
179
180 ACPI_STATUS
AcpiNsRootInitialize(void)181 AcpiNsRootInitialize (
182 void)
183 {
184 ACPI_STATUS Status;
185 const ACPI_PREDEFINED_NAMES *InitVal = NULL;
186 ACPI_NAMESPACE_NODE *NewNode;
187 ACPI_OPERAND_OBJECT *ObjDesc;
188 ACPI_STRING Val = NULL;
189
190
191 ACPI_FUNCTION_TRACE (NsRootInitialize);
192
193
194 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
195 if (ACPI_FAILURE (Status))
196 {
197 return_ACPI_STATUS (Status);
198 }
199
200 /*
201 * The global root ptr is initially NULL, so a non-NULL value indicates
202 * that AcpiNsRootInitialize() has already been called; just return.
203 */
204 if (AcpiGbl_RootNode)
205 {
206 Status = AE_OK;
207 goto UnlockAndExit;
208 }
209
210 /*
211 * Tell the rest of the subsystem that the root is initialized
212 * (This is OK because the namespace is locked)
213 */
214 AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct;
215
216 /* Enter the pre-defined names in the name table */
217
218 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
219 "Entering predefined entries into namespace\n"));
220
221 for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++)
222 {
223 /* _OSI is optional for now, will be permanent later */
224
225 if (!strcmp (InitVal->Name, "_OSI") && !AcpiGbl_CreateOsiMethod)
226 {
227 continue;
228 }
229
230 Status = AcpiNsLookup (NULL, ACPI_CAST_PTR (char, InitVal->Name),
231 InitVal->Type, ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH,
232 NULL, &NewNode);
233 if (ACPI_FAILURE (Status))
234 {
235 ACPI_EXCEPTION ((AE_INFO, Status,
236 "Could not create predefined name %s",
237 InitVal->Name));
238 continue;
239 }
240
241 /*
242 * Name entered successfully. If entry in PreDefinedNames[] specifies
243 * an initial value, create the initial value.
244 */
245 if (InitVal->Val)
246 {
247 Status = AcpiOsPredefinedOverride (InitVal, &Val);
248 if (ACPI_FAILURE (Status))
249 {
250 ACPI_ERROR ((AE_INFO,
251 "Could not override predefined %s",
252 InitVal->Name));
253 }
254
255 if (!Val)
256 {
257 Val = InitVal->Val;
258 }
259
260 /*
261 * Entry requests an initial value, allocate a
262 * descriptor for it.
263 */
264 ObjDesc = AcpiUtCreateInternalObject (InitVal->Type);
265 if (!ObjDesc)
266 {
267 Status = AE_NO_MEMORY;
268 goto UnlockAndExit;
269 }
270
271 /*
272 * Convert value string from table entry to
273 * internal representation. Only types actually
274 * used for initial values are implemented here.
275 */
276 switch (InitVal->Type)
277 {
278 case ACPI_TYPE_METHOD:
279
280 ObjDesc->Method.ParamCount = (UINT8) ACPI_TO_INTEGER (Val);
281 ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID;
282
283 #if defined (ACPI_ASL_COMPILER)
284
285 /* Save the parameter count for the iASL compiler */
286
287 NewNode->Value = ObjDesc->Method.ParamCount;
288 #else
289 /* Mark this as a very SPECIAL method */
290
291 ObjDesc->Method.InfoFlags = ACPI_METHOD_INTERNAL_ONLY;
292 ObjDesc->Method.Dispatch.Implementation = AcpiUtOsiImplementation;
293 #endif
294 break;
295
296 case ACPI_TYPE_INTEGER:
297
298 ObjDesc->Integer.Value = ACPI_TO_INTEGER (Val);
299 break;
300
301 case ACPI_TYPE_STRING:
302
303 /* Build an object around the static string */
304
305 ObjDesc->String.Length = (UINT32) strlen (Val);
306 ObjDesc->String.Pointer = Val;
307 ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER;
308 break;
309
310 case ACPI_TYPE_MUTEX:
311
312 ObjDesc->Mutex.Node = NewNode;
313 ObjDesc->Mutex.SyncLevel = (UINT8) (ACPI_TO_INTEGER (Val) - 1);
314
315 /* Create a mutex */
316
317 Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex);
318 if (ACPI_FAILURE (Status))
319 {
320 AcpiUtRemoveReference (ObjDesc);
321 goto UnlockAndExit;
322 }
323
324 /* Special case for ACPI Global Lock */
325
326 if (strcmp (InitVal->Name, "_GL_") == 0)
327 {
328 AcpiGbl_GlobalLockMutex = ObjDesc;
329
330 /* Create additional counting semaphore for global lock */
331
332 Status = AcpiOsCreateSemaphore (
333 1, 0, &AcpiGbl_GlobalLockSemaphore);
334 if (ACPI_FAILURE (Status))
335 {
336 AcpiUtRemoveReference (ObjDesc);
337 goto UnlockAndExit;
338 }
339 }
340 break;
341
342 default:
343
344 ACPI_ERROR ((AE_INFO, "Unsupported initial type value 0x%X",
345 InitVal->Type));
346 AcpiUtRemoveReference (ObjDesc);
347 ObjDesc = NULL;
348 continue;
349 }
350
351 /* Store pointer to value descriptor in the Node */
352
353 Status = AcpiNsAttachObject (NewNode, ObjDesc,
354 ObjDesc->Common.Type);
355
356 /* Remove local reference to the object */
357
358 AcpiUtRemoveReference (ObjDesc);
359 }
360 }
361
362
363 UnlockAndExit:
364 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
365
366 /* Save a handle to "_GPE", it is always present */
367
368 if (ACPI_SUCCESS (Status))
369 {
370 Status = AcpiNsGetNode (NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH,
371 &AcpiGbl_FadtGpeDevice);
372 }
373
374 return_ACPI_STATUS (Status);
375 }
376
377
378 /*******************************************************************************
379 *
380 * FUNCTION: AcpiNsLookup
381 *
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)
391 *
392 * RETURN: Status
393 *
394 * DESCRIPTION: Find or enter the passed name in the name space.
395 * Log an error if name not found in Exec mode.
396 *
397 * MUTEX: Assumes namespace is locked.
398 *
399 ******************************************************************************/
400
401 ACPI_STATUS
AcpiNsLookup(ACPI_GENERIC_STATE * ScopeInfo,char * Pathname,ACPI_OBJECT_TYPE Type,ACPI_INTERPRETER_MODE InterpreterMode,UINT32 Flags,ACPI_WALK_STATE * WalkState,ACPI_NAMESPACE_NODE ** ReturnNode)402 AcpiNsLookup (
403 ACPI_GENERIC_STATE *ScopeInfo,
404 char *Pathname,
405 ACPI_OBJECT_TYPE Type,
406 ACPI_INTERPRETER_MODE InterpreterMode,
407 UINT32 Flags,
408 ACPI_WALK_STATE *WalkState,
409 ACPI_NAMESPACE_NODE **ReturnNode)
410 {
411 ACPI_STATUS Status;
412 char *Path = Pathname;
413 char *ExternalPath;
414 ACPI_NAMESPACE_NODE *PrefixNode;
415 ACPI_NAMESPACE_NODE *CurrentNode = NULL;
416 ACPI_NAMESPACE_NODE *ThisNode = NULL;
417 UINT32 NumSegments;
418 UINT32 NumCarats;
419 ACPI_NAME SimpleName;
420 ACPI_OBJECT_TYPE TypeToCheckFor;
421 ACPI_OBJECT_TYPE ThisSearchType;
422 UINT32 SearchParentFlag = ACPI_NS_SEARCH_PARENT;
423 UINT32 LocalFlags;
424
425
426 ACPI_FUNCTION_TRACE (NsLookup);
427
428
429 if (!ReturnNode)
430 {
431 return_ACPI_STATUS (AE_BAD_PARAMETER);
432 }
433
434 LocalFlags = Flags &
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++;
439
440 if (!AcpiGbl_RootNode)
441 {
442 return_ACPI_STATUS (AE_NO_NAMESPACE);
443 }
444
445 /* Get the prefix scope. A null scope means use the root scope */
446
447 if ((!ScopeInfo) ||
448 (!ScopeInfo->Scope.Node))
449 {
450 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
451 "Null scope prefix, using root node (%p)\n",
452 AcpiGbl_RootNode));
453
454 PrefixNode = AcpiGbl_RootNode;
455 }
456 else
457 {
458 PrefixNode = ScopeInfo->Scope.Node;
459 if (ACPI_GET_DESCRIPTOR_TYPE (PrefixNode) != ACPI_DESC_TYPE_NAMED)
460 {
461 ACPI_ERROR ((AE_INFO, "%p is not a namespace node [%s]",
462 PrefixNode, AcpiUtGetDescriptorName (PrefixNode)));
463 return_ACPI_STATUS (AE_AML_INTERNAL);
464 }
465
466 if (!(Flags & ACPI_NS_PREFIX_IS_SCOPE))
467 {
468 /*
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.
472 */
473 while (!AcpiNsOpensScope (PrefixNode->Type) &&
474 PrefixNode->Type != ACPI_TYPE_ANY)
475 {
476 PrefixNode = PrefixNode->Parent;
477 }
478 }
479 }
480
481 /* Save type. TBD: may be no longer necessary */
482
483 TypeToCheckFor = Type;
484
485 /*
486 * Begin examination of the actual pathname
487 */
488 if (!Pathname)
489 {
490 /* A Null NamePath is allowed and refers to the root */
491
492 NumSegments = 0;
493 ThisNode = AcpiGbl_RootNode;
494 Path = "";
495
496 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
497 "Null Pathname (Zero segments), Flags=%X\n", Flags));
498 }
499 else
500 {
501 /*
502 * Name pointer is valid (and must be in internal name format)
503 *
504 * Check for scope prefixes:
505 *
506 * As represented in the AML stream, a namepath consists of an
507 * optional scope prefix followed by a name segment part.
508 *
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).
513 */
514 if (*Path == (UINT8) AML_ROOT_PREFIX)
515 {
516 /* Pathname is fully qualified, start from the root */
517
518 ThisNode = AcpiGbl_RootNode;
519 SearchParentFlag = ACPI_NS_NO_UPSEARCH;
520
521 /* Point to name segment part */
522
523 Path++;
524
525 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
526 "Path is absolute from root [%p]\n", ThisNode));
527 }
528 else
529 {
530 /* Pathname is relative to current scope, start there */
531
532 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
533 "Searching relative to prefix scope [%4.4s] (%p)\n",
534 AcpiUtGetNodeName (PrefixNode), PrefixNode));
535
536 /*
537 * Handle multiple Parent Prefixes (carat) by just getting
538 * the parent node for each prefix instance.
539 */
540 ThisNode = PrefixNode;
541 NumCarats = 0;
542 while (*Path == (UINT8) AML_PARENT_PREFIX)
543 {
544 /* Name is fully qualified, no search rules apply */
545
546 SearchParentFlag = ACPI_NS_NO_UPSEARCH;
547
548 /*
549 * Point past this prefix to the name segment
550 * part or the next Parent Prefix
551 */
552 Path++;
553
554 /* Backup to the parent node */
555
556 NumCarats++;
557 ThisNode = ThisNode->Parent;
558 if (!ThisNode)
559 {
560 /*
561 * Current scope has no parent scope. Externalize
562 * the internal path for error message.
563 */
564 Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, Pathname,
565 NULL, &ExternalPath);
566 if (ACPI_SUCCESS (Status))
567 {
568 ACPI_ERROR ((AE_INFO,
569 "%s: Path has too many parent prefixes (^)",
570 ExternalPath));
571
572 ACPI_FREE (ExternalPath);
573 }
574
575 return_ACPI_STATUS (AE_NOT_FOUND);
576 }
577 }
578
579 if (SearchParentFlag == ACPI_NS_NO_UPSEARCH)
580 {
581 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
582 "Search scope is [%4.4s], path has %u carat(s)\n",
583 AcpiUtGetNodeName (ThisNode), NumCarats));
584 }
585 }
586
587 /*
588 * Determine the number of ACPI name segments in this pathname.
589 *
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
596 *
597 * Examine the name prefix opcode, if any, to determine the number of
598 * segments.
599 */
600 switch (*Path)
601 {
602 case 0:
603 /*
604 * Null name after a root or parent prefixes. We already
605 * have the correct target node and there are no name segments.
606 */
607 NumSegments = 0;
608 Type = ThisNode->Type;
609
610 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
611 "Prefix-only Pathname (Zero name segments), Flags=%X\n",
612 Flags));
613 break;
614
615 case AML_DUAL_NAME_PREFIX:
616
617 /* More than one NameSeg, search rules do not apply */
618
619 SearchParentFlag = ACPI_NS_NO_UPSEARCH;
620
621 /* Two segments, point to first name segment */
622
623 NumSegments = 2;
624 Path++;
625
626 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
627 "Dual Pathname (2 segments, Flags=%X)\n", Flags));
628 break;
629
630 case AML_MULTI_NAME_PREFIX:
631
632 /* More than one NameSeg, search rules do not apply */
633
634 SearchParentFlag = ACPI_NS_NO_UPSEARCH;
635
636 /* Extract segment count, point to first name segment */
637
638 Path++;
639 NumSegments = (UINT32) (UINT8) *Path;
640 Path++;
641
642 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
643 "Multi Pathname (%u Segments, Flags=%X)\n",
644 NumSegments, Flags));
645 break;
646
647 default:
648 /*
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.
651 */
652 NumSegments = 1;
653
654 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
655 "Simple Pathname (1 segment, Flags=%X)\n", Flags));
656 break;
657 }
658
659 ACPI_DEBUG_EXEC (AcpiNsPrintPathname (NumSegments, Path));
660 }
661
662
663 /*
664 * Search namespace for each segment of the name. Loop through and
665 * verify (or add to the namespace) each name segment.
666 *
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.)
670 */
671 ThisSearchType = ACPI_TYPE_ANY;
672 CurrentNode = ThisNode;
673 while (NumSegments && CurrentNode)
674 {
675 NumSegments--;
676 if (!NumSegments)
677 {
678 /* This is the last segment, enable typechecking */
679
680 ThisSearchType = Type;
681
682 /*
683 * Only allow automatic parent search (search rules) if the caller
684 * requested it AND we have a single, non-fully-qualified NameSeg
685 */
686 if ((SearchParentFlag != ACPI_NS_NO_UPSEARCH) &&
687 (Flags & ACPI_NS_SEARCH_PARENT))
688 {
689 LocalFlags |= ACPI_NS_SEARCH_PARENT;
690 }
691
692 /* Set error flag according to caller */
693
694 if (Flags & ACPI_NS_ERROR_IF_FOUND)
695 {
696 LocalFlags |= ACPI_NS_ERROR_IF_FOUND;
697 }
698
699 /* Set override flag according to caller */
700
701 if (Flags & ACPI_NS_OVERRIDE_IF_FOUND)
702 {
703 LocalFlags |= ACPI_NS_OVERRIDE_IF_FOUND;
704 }
705 }
706
707 /* Extract one ACPI name from the front of the pathname */
708
709 ACPI_MOVE_32_TO_32 (&SimpleName, Path);
710
711 /* Try to find the single (4 character) ACPI name */
712
713 Status = AcpiNsSearchAndEnter (SimpleName, WalkState, CurrentNode,
714 InterpreterMode, ThisSearchType, LocalFlags, &ThisNode);
715 if (ACPI_FAILURE (Status))
716 {
717 if (Status == AE_NOT_FOUND)
718 {
719 /* Name not found in ACPI namespace */
720
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,
724 CurrentNode));
725 }
726
727 #ifdef ACPI_ASL_COMPILER
728 /*
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.
735 */
736 if (AcpiGbl_DisasmFlag &&
737 (Status == AE_ALREADY_EXISTS) &&
738 ((ThisNode->Flags & ANOBJ_IS_EXTERNAL) ||
739 (WalkState && WalkState->Opcode == AML_EXTERNAL_OP)))
740 {
741 ThisNode->Flags &= ~ANOBJ_IS_EXTERNAL;
742 ThisNode->Type = (UINT8)ThisSearchType;
743 if (WalkState->Opcode != AML_EXTERNAL_OP)
744 {
745 AcpiDmMarkExternalConflict (ThisNode);
746 }
747 break;
748 }
749 #endif
750
751 *ReturnNode = ThisNode;
752 return_ACPI_STATUS (Status);
753 }
754
755 /* More segments to follow? */
756
757 if (NumSegments > 0)
758 {
759 /*
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).
764 */
765 if (ThisNode->Type == ACPI_TYPE_LOCAL_ALIAS)
766 {
767 if (!ThisNode->Object)
768 {
769 return_ACPI_STATUS (AE_NOT_EXIST);
770 }
771
772 if (AcpiNsOpensScope (((ACPI_NAMESPACE_NODE *)
773 ThisNode->Object)->Type))
774 {
775 ThisNode = (ACPI_NAMESPACE_NODE *) ThisNode->Object;
776 }
777 }
778 }
779
780 /* Special handling for the last segment (NumSegments == 0) */
781
782 else
783 {
784 /*
785 * Sanity typecheck of the target object:
786 *
787 * If 1) This is the last segment (NumSegments == 0)
788 * 2) And we are looking for a specific type
789 * (Not checking for TYPE_ANY)
790 * 3) Which is not an alias
791 * 4) Which is not a local type (TYPE_SCOPE)
792 * 5) And the type of target object is known (not TYPE_ANY)
793 * 6) And target object does not match what we are looking for
794 *
795 * Then we have a type mismatch. Just warn and ignore it.
796 */
797 if ((TypeToCheckFor != ACPI_TYPE_ANY) &&
798 (TypeToCheckFor != ACPI_TYPE_LOCAL_ALIAS) &&
799 (TypeToCheckFor != ACPI_TYPE_LOCAL_METHOD_ALIAS) &&
800 (TypeToCheckFor != ACPI_TYPE_LOCAL_SCOPE) &&
801 (ThisNode->Type != ACPI_TYPE_ANY) &&
802 (ThisNode->Type != TypeToCheckFor))
803 {
804 /* Complain about a type mismatch */
805
806 ACPI_WARNING ((AE_INFO,
807 "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)",
808 ACPI_CAST_PTR (char, &SimpleName),
809 AcpiUtGetTypeName (ThisNode->Type),
810 AcpiUtGetTypeName (TypeToCheckFor)));
811 }
812
813 /*
814 * If this is the last name segment and we are not looking for a
815 * specific type, but the type of found object is known, use that
816 * type to (later) see if it opens a scope.
817 */
818 if (Type == ACPI_TYPE_ANY)
819 {
820 Type = ThisNode->Type;
821 }
822 }
823
824 /* Point to next name segment and make this node current */
825
826 Path += ACPI_NAME_SIZE;
827 CurrentNode = ThisNode;
828 }
829
830 /* Always check if we need to open a new scope */
831
832 if (!(Flags & ACPI_NS_DONT_OPEN_SCOPE) && (WalkState))
833 {
834 /*
835 * If entry is a type which opens a scope, push the new scope on the
836 * scope stack.
837 */
838 if (AcpiNsOpensScope (Type))
839 {
840 Status = AcpiDsScopeStackPush (ThisNode, Type, WalkState);
841 if (ACPI_FAILURE (Status))
842 {
843 return_ACPI_STATUS (Status);
844 }
845 }
846 }
847
848 *ReturnNode = ThisNode;
849 return_ACPI_STATUS (AE_OK);
850 }
851