1 /******************************************************************************
2 *
3 * Module Name: aslxref - Namespace cross-reference
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2014, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44
45 #include "aslcompiler.h"
46 #include "aslcompiler.y.h"
47 #include "acparser.h"
48 #include "amlcode.h"
49 #include "acnamesp.h"
50 #include "acdispat.h"
51
52
53 #define _COMPONENT ACPI_COMPILER
54 ACPI_MODULE_NAME ("aslxref")
55
56 /* Local prototypes */
57
58 static ACPI_STATUS
59 XfNamespaceLocateBegin (
60 ACPI_PARSE_OBJECT *Op,
61 UINT32 Level,
62 void *Context);
63
64 static ACPI_STATUS
65 XfNamespaceLocateEnd (
66 ACPI_PARSE_OBJECT *Op,
67 UINT32 Level,
68 void *Context);
69
70 static BOOLEAN
71 XfObjectExists (
72 char *Name);
73
74 static ACPI_STATUS
75 XfCompareOneNamespaceObject (
76 ACPI_HANDLE ObjHandle,
77 UINT32 Level,
78 void *Context,
79 void **ReturnValue);
80
81 static void
82 XfCheckFieldRange (
83 ACPI_PARSE_OBJECT *Op,
84 UINT32 RegionBitLength,
85 UINT32 FieldBitOffset,
86 UINT32 FieldBitLength,
87 UINT32 AccessBitWidth);
88
89
90 /*******************************************************************************
91 *
92 * FUNCTION: XfCrossReferenceNamespace
93 *
94 * PARAMETERS: None
95 *
96 * RETURN: Status
97 *
98 * DESCRIPTION: Perform a cross reference check of the parse tree against the
99 * namespace. Every named referenced within the parse tree
100 * should be get resolved with a namespace lookup. If not, the
101 * original reference in the ASL code is invalid -- i.e., refers
102 * to a non-existent object.
103 *
104 * NOTE: The ASL "External" operator causes the name to be inserted into the
105 * namespace so that references to the external name will be resolved
106 * correctly here.
107 *
108 ******************************************************************************/
109
110 ACPI_STATUS
111 XfCrossReferenceNamespace (
112 void)
113 {
114 ACPI_WALK_STATE *WalkState;
115
116
117 DbgPrint (ASL_DEBUG_OUTPUT, "\nCross referencing namespace\n\n");
118
119 /*
120 * Create a new walk state for use when looking up names
121 * within the namespace (Passed as context to the callbacks)
122 */
123 WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
124 if (!WalkState)
125 {
126 return (AE_NO_MEMORY);
127 }
128
129 /* Walk the entire parse tree */
130
131 TrWalkParseTree (RootNode, ASL_WALK_VISIT_TWICE, XfNamespaceLocateBegin,
132 XfNamespaceLocateEnd, WalkState);
133 return (AE_OK);
134 }
135
136
137 /*******************************************************************************
138 *
139 * FUNCTION: XfObjectExists
140 *
141 * PARAMETERS: Name - 4 char ACPI name
142 *
143 * RETURN: TRUE if name exists in namespace
144 *
145 * DESCRIPTION: Walk the namespace to find an object
146 *
147 ******************************************************************************/
148
149 static BOOLEAN
150 XfObjectExists (
151 char *Name)
152 {
153 ACPI_STATUS Status;
154
155
156 /* Walk entire namespace from the supplied root */
157
158 Status = AcpiNsWalkNamespace (ACPI_TYPE_ANY, ACPI_ROOT_OBJECT,
159 ACPI_UINT32_MAX, FALSE, XfCompareOneNamespaceObject, NULL,
160 Name, NULL);
161 if (Status == AE_CTRL_TRUE)
162 {
163 /* At least one instance of the name was found */
164
165 return (TRUE);
166 }
167
168 return (FALSE);
169 }
170
171
172 /*******************************************************************************
173 *
174 * FUNCTION: XfCompareOneNamespaceObject
175 *
176 * PARAMETERS: ACPI_WALK_CALLBACK
177 *
178 * RETURN: Status
179 *
180 * DESCRIPTION: Compare name of one object.
181 *
182 ******************************************************************************/
183
184 static ACPI_STATUS
185 XfCompareOneNamespaceObject (
186 ACPI_HANDLE ObjHandle,
187 UINT32 Level,
188 void *Context,
189 void **ReturnValue)
190 {
191 ACPI_NAMESPACE_NODE *Node = (ACPI_NAMESPACE_NODE *) ObjHandle;
192
193
194 /* Simply check the name */
195
196 if (*((UINT32 *) (Context)) == Node->Name.Integer)
197 {
198 /* Abort walk if we found one instance */
199
200 return (AE_CTRL_TRUE);
201 }
202
203 return (AE_OK);
204 }
205
206
207 /*******************************************************************************
208 *
209 * FUNCTION: XfCheckFieldRange
210 *
211 * PARAMETERS: RegionBitLength - Length of entire parent region
212 * FieldBitOffset - Start of the field unit (within region)
213 * FieldBitLength - Entire length of field unit
214 * AccessBitWidth - Access width of the field unit
215 *
216 * RETURN: None
217 *
218 * DESCRIPTION: Check one field unit to make sure it fits in the parent
219 * op region.
220 *
221 * Note: AccessBitWidth must be either 8,16,32, or 64
222 *
223 ******************************************************************************/
224
225 static void
226 XfCheckFieldRange (
227 ACPI_PARSE_OBJECT *Op,
228 UINT32 RegionBitLength,
229 UINT32 FieldBitOffset,
230 UINT32 FieldBitLength,
231 UINT32 AccessBitWidth)
232 {
233 UINT32 FieldEndBitOffset;
234
235
236 /*
237 * Check each field unit against the region size. The entire
238 * field unit (start offset plus length) must fit within the
239 * region.
240 */
241 FieldEndBitOffset = FieldBitOffset + FieldBitLength;
242
243 if (FieldEndBitOffset > RegionBitLength)
244 {
245 /* Field definition itself is beyond the end-of-region */
246
247 AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_OFFSET, Op, NULL);
248 return;
249 }
250
251 /*
252 * Now check that the field plus AccessWidth doesn't go beyond
253 * the end-of-region. Assumes AccessBitWidth is a power of 2
254 */
255 FieldEndBitOffset = ACPI_ROUND_UP (FieldEndBitOffset, AccessBitWidth);
256
257 if (FieldEndBitOffset > RegionBitLength)
258 {
259 /* Field definition combined with the access is beyond EOR */
260
261 AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_ACCESS_WIDTH, Op, NULL);
262 }
263 }
264
265 /*******************************************************************************
266 *
267 * FUNCTION: XfNamespaceLocateBegin
268 *
269 * PARAMETERS: ASL_WALK_CALLBACK
270 *
271 * RETURN: Status
272 *
273 * DESCRIPTION: Descending callback used during cross-reference. For named
274 * object references, attempt to locate the name in the
275 * namespace.
276 *
277 * NOTE: ASL references to named fields within resource descriptors are
278 * resolved to integer values here. Therefore, this step is an
279 * important part of the code generation. We don't know that the
280 * name refers to a resource descriptor until now.
281 *
282 ******************************************************************************/
283
284 static ACPI_STATUS
285 XfNamespaceLocateBegin (
286 ACPI_PARSE_OBJECT *Op,
287 UINT32 Level,
288 void *Context)
289 {
290 ACPI_WALK_STATE *WalkState = (ACPI_WALK_STATE *) Context;
291 ACPI_NAMESPACE_NODE *Node;
292 ACPI_STATUS Status;
293 ACPI_OBJECT_TYPE ObjectType;
294 char *Path;
295 UINT8 PassedArgs;
296 ACPI_PARSE_OBJECT *NextOp;
297 ACPI_PARSE_OBJECT *OwningOp;
298 ACPI_PARSE_OBJECT *SpaceIdOp;
299 UINT32 MinimumLength;
300 UINT32 Offset;
301 UINT32 FieldBitLength;
302 UINT32 TagBitLength;
303 UINT8 Message = 0;
304 const ACPI_OPCODE_INFO *OpInfo;
305 UINT32 Flags;
306
307
308 ACPI_FUNCTION_TRACE_PTR (XfNamespaceLocateBegin, Op);
309
310 /*
311 * If this node is the actual declaration of a name
312 * [such as the XXXX name in "Method (XXXX)"],
313 * we are not interested in it here. We only care about names that are
314 * references to other objects within the namespace and the parent objects
315 * of name declarations
316 */
317 if (Op->Asl.CompileFlags & NODE_IS_NAME_DECLARATION)
318 {
319 return_ACPI_STATUS (AE_OK);
320 }
321
322 /* We are only interested in opcodes that have an associated name */
323
324 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);
325
326 if ((!(OpInfo->Flags & AML_NAMED)) &&
327 (!(OpInfo->Flags & AML_CREATE)) &&
328 (Op->Asl.ParseOpcode != PARSEOP_NAMESTRING) &&
329 (Op->Asl.ParseOpcode != PARSEOP_NAMESEG) &&
330 (Op->Asl.ParseOpcode != PARSEOP_METHODCALL))
331 {
332 return_ACPI_STATUS (AE_OK);
333 }
334
335 /*
336 * One special case: CondRefOf operator - we don't care if the name exists
337 * or not at this point, just ignore it, the point of the operator is to
338 * determine if the name exists at runtime.
339 */
340 if ((Op->Asl.Parent) &&
341 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONDREFOF))
342 {
343 return_ACPI_STATUS (AE_OK);
344 }
345
346 /*
347 * We must enable the "search-to-root" for single NameSegs, but
348 * we have to be very careful about opening up scopes
349 */
350 Flags = ACPI_NS_SEARCH_PARENT;
351 if ((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) ||
352 (Op->Asl.ParseOpcode == PARSEOP_NAMESEG) ||
353 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL))
354 {
355 /*
356 * These are name references, do not push the scope stack
357 * for them.
358 */
359 Flags |= ACPI_NS_DONT_OPEN_SCOPE;
360 }
361
362 /* Get the NamePath from the appropriate place */
363
364 if (OpInfo->Flags & AML_NAMED)
365 {
366 /* For nearly all NAMED operators, the name reference is the first child */
367
368 Path = Op->Asl.Child->Asl.Value.String;
369 if (Op->Asl.AmlOpcode == AML_ALIAS_OP)
370 {
371 /*
372 * ALIAS is the only oddball opcode, the name declaration
373 * (alias name) is the second operand
374 */
375 Path = Op->Asl.Child->Asl.Next->Asl.Value.String;
376 }
377 }
378 else if (OpInfo->Flags & AML_CREATE)
379 {
380 /* Name must appear as the last parameter */
381
382 NextOp = Op->Asl.Child;
383 while (!(NextOp->Asl.CompileFlags & NODE_IS_NAME_DECLARATION))
384 {
385 NextOp = NextOp->Asl.Next;
386 }
387 Path = NextOp->Asl.Value.String;
388 }
389 else
390 {
391 Path = Op->Asl.Value.String;
392 }
393
394 ObjectType = AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode);
395 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
396 "Type=%s\n", AcpiUtGetTypeName (ObjectType)));
397
398 /*
399 * Lookup the name in the namespace. Name must exist at this point, or it
400 * is an invalid reference.
401 *
402 * The namespace is also used as a lookup table for references to resource
403 * descriptors and the fields within them.
404 */
405 Gbl_NsLookupCount++;
406
407 Status = AcpiNsLookup (WalkState->ScopeInfo, Path, ObjectType,
408 ACPI_IMODE_EXECUTE, Flags, WalkState, &(Node));
409 if (ACPI_FAILURE (Status))
410 {
411 if (Status == AE_NOT_FOUND)
412 {
413 /*
414 * We didn't find the name reference by path -- we can qualify this
415 * a little better before we print an error message
416 */
417 if (strlen (Path) == ACPI_NAME_SIZE)
418 {
419 /* A simple, one-segment ACPI name */
420
421 if (XfObjectExists (Path))
422 {
423 /*
424 * There exists such a name, but we couldn't get to it
425 * from this scope
426 */
427 AslError (ASL_ERROR, ASL_MSG_NOT_REACHABLE, Op,
428 Op->Asl.ExternalName);
429 }
430 else
431 {
432 /* The name doesn't exist, period */
433
434 AslError (ASL_ERROR, ASL_MSG_NOT_EXIST,
435 Op, Op->Asl.ExternalName);
436 }
437 }
438 else
439 {
440 /* Check for a fully qualified path */
441
442 if (Path[0] == AML_ROOT_PREFIX)
443 {
444 /* Gave full path, the object does not exist */
445
446 AslError (ASL_ERROR, ASL_MSG_NOT_EXIST, Op,
447 Op->Asl.ExternalName);
448 }
449 else
450 {
451 /*
452 * We can't tell whether it doesn't exist or just
453 * can't be reached.
454 */
455 AslError (ASL_ERROR, ASL_MSG_NOT_FOUND, Op,
456 Op->Asl.ExternalName);
457 }
458 }
459
460 Status = AE_OK;
461 }
462
463 return_ACPI_STATUS (Status);
464 }
465
466 /* Check for a reference vs. name declaration */
467
468 if (!(OpInfo->Flags & AML_NAMED) &&
469 !(OpInfo->Flags & AML_CREATE))
470 {
471 /* This node has been referenced, mark it for reference check */
472
473 Node->Flags |= ANOBJ_IS_REFERENCED;
474 }
475
476 /* Attempt to optimize the NamePath */
477
478 OptOptimizeNamePath (Op, OpInfo->Flags, WalkState, Path, Node);
479
480 /*
481 * 1) Dereference an alias (A name reference that is an alias)
482 * Aliases are not nested, the alias always points to the final object
483 */
484 if ((Op->Asl.ParseOpcode != PARSEOP_ALIAS) &&
485 (Node->Type == ACPI_TYPE_LOCAL_ALIAS))
486 {
487 /* This node points back to the original PARSEOP_ALIAS */
488
489 NextOp = Node->Op;
490
491 /* The first child is the alias target op */
492
493 NextOp = NextOp->Asl.Child;
494
495 /* That in turn points back to original target alias node */
496
497 if (NextOp->Asl.Node)
498 {
499 Node = NextOp->Asl.Node;
500 }
501
502 /* Else - forward reference to alias, will be resolved later */
503 }
504
505 /* 2) Check for a reference to a resource descriptor */
506
507 if ((Node->Type == ACPI_TYPE_LOCAL_RESOURCE_FIELD) ||
508 (Node->Type == ACPI_TYPE_LOCAL_RESOURCE))
509 {
510 /*
511 * This was a reference to a field within a resource descriptor.
512 * Extract the associated field offset (either a bit or byte
513 * offset depending on the field type) and change the named
514 * reference into an integer for AML code generation
515 */
516 Offset = Node->Value;
517 TagBitLength = Node->Length;
518
519 /*
520 * If a field is being created, generate the length (in bits) of
521 * the field. Note: Opcodes other than CreateXxxField and Index
522 * can come through here. For other opcodes, we just need to
523 * convert the resource tag reference to an integer offset.
524 */
525 switch (Op->Asl.Parent->Asl.AmlOpcode)
526 {
527 case AML_CREATE_FIELD_OP: /* Variable "Length" field, in bits */
528 /*
529 * We know the length operand is an integer constant because
530 * we know that it contains a reference to a resource
531 * descriptor tag.
532 */
533 FieldBitLength = (UINT32) Op->Asl.Next->Asl.Value.Integer;
534 break;
535
536 case AML_CREATE_BIT_FIELD_OP:
537
538 FieldBitLength = 1;
539 break;
540
541 case AML_CREATE_BYTE_FIELD_OP:
542 case AML_INDEX_OP:
543
544 FieldBitLength = 8;
545 break;
546
547 case AML_CREATE_WORD_FIELD_OP:
548
549 FieldBitLength = 16;
550 break;
551
552 case AML_CREATE_DWORD_FIELD_OP:
553
554 FieldBitLength = 32;
555 break;
556
557 case AML_CREATE_QWORD_FIELD_OP:
558
559 FieldBitLength = 64;
560 break;
561
562 default:
563
564 FieldBitLength = 0;
565 break;
566 }
567
568 /* Check the field length against the length of the resource tag */
569
570 if (FieldBitLength)
571 {
572 if (TagBitLength < FieldBitLength)
573 {
574 Message = ASL_MSG_TAG_SMALLER;
575 }
576 else if (TagBitLength > FieldBitLength)
577 {
578 Message = ASL_MSG_TAG_LARGER;
579 }
580
581 if (Message)
582 {
583 sprintf (MsgBuffer, "Size mismatch, Tag: %u bit%s, Field: %u bit%s",
584 TagBitLength, (TagBitLength > 1) ? "s" : "",
585 FieldBitLength, (FieldBitLength > 1) ? "s" : "");
586
587 AslError (ASL_WARNING, Message, Op, MsgBuffer);
588 }
589 }
590
591 /* Convert the BitOffset to a ByteOffset for certain opcodes */
592
593 switch (Op->Asl.Parent->Asl.AmlOpcode)
594 {
595 case AML_CREATE_BYTE_FIELD_OP:
596 case AML_CREATE_WORD_FIELD_OP:
597 case AML_CREATE_DWORD_FIELD_OP:
598 case AML_CREATE_QWORD_FIELD_OP:
599 case AML_INDEX_OP:
600
601 Offset = ACPI_DIV_8 (Offset);
602 break;
603
604 default:
605
606 break;
607 }
608
609 /* Now convert this node to an integer whose value is the field offset */
610
611 Op->Asl.AmlLength = 0;
612 Op->Asl.ParseOpcode = PARSEOP_INTEGER;
613 Op->Asl.Value.Integer = (UINT64) Offset;
614 Op->Asl.CompileFlags |= NODE_IS_RESOURCE_FIELD;
615
616 OpcGenerateAmlOpcode (Op);
617 }
618
619 /* 3) Check for a method invocation */
620
621 else if ((((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) || (Op->Asl.ParseOpcode == PARSEOP_NAMESEG)) &&
622 (Node->Type == ACPI_TYPE_METHOD) &&
623 (Op->Asl.Parent) &&
624 (Op->Asl.Parent->Asl.ParseOpcode != PARSEOP_METHOD)) ||
625
626 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL))
627 {
628 /*
629 * A reference to a method within one of these opcodes is not an
630 * invocation of the method, it is simply a reference to the method.
631 */
632 if ((Op->Asl.Parent) &&
633 ((Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_REFOF) ||
634 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_DEREFOF) ||
635 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_OBJECTTYPE)))
636 {
637 return_ACPI_STATUS (AE_OK);
638 }
639 /*
640 * There are two types of method invocation:
641 * 1) Invocation with arguments -- the parser recognizes this
642 * as a METHODCALL.
643 * 2) Invocation with no arguments --the parser cannot determine that
644 * this is a method invocation, therefore we have to figure it out
645 * here.
646 */
647 if (Node->Type != ACPI_TYPE_METHOD)
648 {
649 sprintf (MsgBuffer, "%s is a %s",
650 Op->Asl.ExternalName, AcpiUtGetTypeName (Node->Type));
651
652 AslError (ASL_ERROR, ASL_MSG_NOT_METHOD, Op, MsgBuffer);
653 return_ACPI_STATUS (AE_OK);
654 }
655
656 /* Save the method node in the caller's op */
657
658 Op->Asl.Node = Node;
659 if (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_CONDREFOF)
660 {
661 return_ACPI_STATUS (AE_OK);
662 }
663
664 /*
665 * This is a method invocation, with or without arguments.
666 * Count the number of arguments, each appears as a child
667 * under the parent node
668 */
669 Op->Asl.ParseOpcode = PARSEOP_METHODCALL;
670 UtSetParseOpName (Op);
671
672 PassedArgs = 0;
673 NextOp = Op->Asl.Child;
674
675 while (NextOp)
676 {
677 PassedArgs++;
678 NextOp = NextOp->Asl.Next;
679 }
680
681 if (Node->Value != ASL_EXTERNAL_METHOD)
682 {
683 /*
684 * Check the parsed arguments with the number expected by the
685 * method declaration itself
686 */
687 if (PassedArgs != Node->Value)
688 {
689 sprintf (MsgBuffer, "%s requires %u", Op->Asl.ExternalName,
690 Node->Value);
691
692 if (PassedArgs < Node->Value)
693 {
694 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_LO, Op, MsgBuffer);
695 }
696 else
697 {
698 AslError (ASL_ERROR, ASL_MSG_ARG_COUNT_HI, Op, MsgBuffer);
699 }
700 }
701 }
702 }
703
704 /* 4) Check for an ASL Field definition */
705
706 else if ((Op->Asl.Parent) &&
707 ((Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_FIELD) ||
708 (Op->Asl.Parent->Asl.ParseOpcode == PARSEOP_BANKFIELD)))
709 {
710 /*
711 * Offset checking for fields. If the parent operation region has a
712 * constant length (known at compile time), we can check fields
713 * defined in that region against the region length. This will catch
714 * fields and field units that cannot possibly fit within the region.
715 *
716 * Note: Index fields do not directly reference an operation region,
717 * thus they are not included in this check.
718 */
719 if (Op == Op->Asl.Parent->Asl.Child)
720 {
721 /*
722 * This is the first child of the field node, which is
723 * the name of the region. Get the parse node for the
724 * region -- which contains the length of the region.
725 */
726 OwningOp = Node->Op;
727 Op->Asl.Parent->Asl.ExtraValue =
728 ACPI_MUL_8 ((UINT32) OwningOp->Asl.Value.Integer);
729
730 /* Examine the field access width */
731
732 switch ((UINT8) Op->Asl.Parent->Asl.Value.Integer)
733 {
734 case AML_FIELD_ACCESS_ANY:
735 case AML_FIELD_ACCESS_BYTE:
736 case AML_FIELD_ACCESS_BUFFER:
737 default:
738
739 MinimumLength = 1;
740 break;
741
742 case AML_FIELD_ACCESS_WORD:
743
744 MinimumLength = 2;
745 break;
746
747 case AML_FIELD_ACCESS_DWORD:
748
749 MinimumLength = 4;
750 break;
751
752 case AML_FIELD_ACCESS_QWORD:
753
754 MinimumLength = 8;
755 break;
756 }
757
758 /*
759 * Is the region at least as big as the access width?
760 * Note: DataTableRegions have 0 length
761 */
762 if (((UINT32) OwningOp->Asl.Value.Integer) &&
763 ((UINT32) OwningOp->Asl.Value.Integer < MinimumLength))
764 {
765 AslError (ASL_ERROR, ASL_MSG_FIELD_ACCESS_WIDTH, Op, NULL);
766 }
767
768 /*
769 * Check EC/CMOS/SMBUS fields to make sure that the correct
770 * access type is used (BYTE for EC/CMOS, BUFFER for SMBUS)
771 */
772 SpaceIdOp = OwningOp->Asl.Child->Asl.Next;
773 switch ((UINT32) SpaceIdOp->Asl.Value.Integer)
774 {
775 case ACPI_ADR_SPACE_EC:
776 case ACPI_ADR_SPACE_CMOS:
777 case ACPI_ADR_SPACE_GPIO:
778
779 if ((UINT8) Op->Asl.Parent->Asl.Value.Integer != AML_FIELD_ACCESS_BYTE)
780 {
781 AslError (ASL_ERROR, ASL_MSG_REGION_BYTE_ACCESS, Op, NULL);
782 }
783 break;
784
785 case ACPI_ADR_SPACE_SMBUS:
786 case ACPI_ADR_SPACE_IPMI:
787 case ACPI_ADR_SPACE_GSBUS:
788
789 if ((UINT8) Op->Asl.Parent->Asl.Value.Integer != AML_FIELD_ACCESS_BUFFER)
790 {
791 AslError (ASL_ERROR, ASL_MSG_REGION_BUFFER_ACCESS, Op, NULL);
792 }
793 break;
794
795 default:
796
797 /* Nothing to do for other address spaces */
798
799 break;
800 }
801 }
802 else
803 {
804 /*
805 * This is one element of the field list. Check to make sure
806 * that it does not go beyond the end of the parent operation region.
807 *
808 * In the code below:
809 * Op->Asl.Parent->Asl.ExtraValue - Region Length (bits)
810 * Op->Asl.ExtraValue - Field start offset (bits)
811 * Op->Asl.Child->Asl.Value.Integer32 - Field length (bits)
812 * Op->Asl.Child->Asl.ExtraValue - Field access width (bits)
813 */
814 if (Op->Asl.Parent->Asl.ExtraValue && Op->Asl.Child)
815 {
816 XfCheckFieldRange (Op,
817 Op->Asl.Parent->Asl.ExtraValue,
818 Op->Asl.ExtraValue,
819 (UINT32) Op->Asl.Child->Asl.Value.Integer,
820 Op->Asl.Child->Asl.ExtraValue);
821 }
822 }
823 }
824
825 Op->Asl.Node = Node;
826 return_ACPI_STATUS (Status);
827 }
828
829
830 /*******************************************************************************
831 *
832 * FUNCTION: XfNamespaceLocateEnd
833 *
834 * PARAMETERS: ASL_WALK_CALLBACK
835 *
836 * RETURN: Status
837 *
838 * DESCRIPTION: Ascending callback used during cross reference. We only
839 * need to worry about scope management here.
840 *
841 ******************************************************************************/
842
843 static ACPI_STATUS
844 XfNamespaceLocateEnd (
845 ACPI_PARSE_OBJECT *Op,
846 UINT32 Level,
847 void *Context)
848 {
849 ACPI_WALK_STATE *WalkState = (ACPI_WALK_STATE *) Context;
850 const ACPI_OPCODE_INFO *OpInfo;
851
852
853 ACPI_FUNCTION_TRACE (XfNamespaceLocateEnd);
854
855
856 /* We are only interested in opcodes that have an associated name */
857
858 OpInfo = AcpiPsGetOpcodeInfo (Op->Asl.AmlOpcode);
859 if (!(OpInfo->Flags & AML_NAMED))
860 {
861 return_ACPI_STATUS (AE_OK);
862 }
863
864 /* Not interested in name references, we did not open a scope for them */
865
866 if ((Op->Asl.ParseOpcode == PARSEOP_NAMESTRING) ||
867 (Op->Asl.ParseOpcode == PARSEOP_NAMESEG) ||
868 (Op->Asl.ParseOpcode == PARSEOP_METHODCALL))
869 {
870 return_ACPI_STATUS (AE_OK);
871 }
872
873 /* Pop the scope stack if necessary */
874
875 if (AcpiNsOpensScope (AslMapNamedOpcodeToDataType (Op->Asl.AmlOpcode)))
876 {
877
878 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
879 "%s: Popping scope for Op %p\n",
880 AcpiUtGetTypeName (OpInfo->ObjectType), Op));
881
882 (void) AcpiDsScopeStackPop (WalkState);
883 }
884
885 return_ACPI_STATUS (AE_OK);
886 }