1 /*******************************************************************************
2 *
3 * Module Name: dsmthdat - control method arguments and local variables
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2011, 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 #define __DSMTHDAT_C__
45
46 #include "acpi.h"
47 #include "accommon.h"
48 #include "acdispat.h"
49 #include "acnamesp.h"
50 #include "acinterp.h"
51
52
53 #define _COMPONENT ACPI_DISPATCHER
54 ACPI_MODULE_NAME ("dsmthdat")
55
56 /* Local prototypes */
57
58 static void
59 AcpiDsMethodDataDeleteValue (
60 UINT8 Type,
61 UINT32 Index,
62 ACPI_WALK_STATE *WalkState);
63
64 static ACPI_STATUS
65 AcpiDsMethodDataSetValue (
66 UINT8 Type,
67 UINT32 Index,
68 ACPI_OPERAND_OBJECT *Object,
69 ACPI_WALK_STATE *WalkState);
70
71 #ifdef ACPI_OBSOLETE_FUNCTIONS
72 ACPI_OBJECT_TYPE
73 AcpiDsMethodDataGetType (
74 UINT16 Opcode,
75 UINT32 Index,
76 ACPI_WALK_STATE *WalkState);
77 #endif
78
79
80 /*******************************************************************************
81 *
82 * FUNCTION: AcpiDsMethodDataInit
83 *
84 * PARAMETERS: WalkState - Current walk state object
85 *
86 * RETURN: Status
87 *
88 * DESCRIPTION: Initialize the data structures that hold the method's arguments
89 * and locals. The data struct is an array of namespace nodes for
90 * each - this allows RefOf and DeRefOf to work properly for these
91 * special data types.
92 *
93 * NOTES: WalkState fields are initialized to zero by the
94 * ACPI_ALLOCATE_ZEROED().
95 *
96 * A pseudo-Namespace Node is assigned to each argument and local
97 * so that RefOf() can return a pointer to the Node.
98 *
99 ******************************************************************************/
100
101 void
102 AcpiDsMethodDataInit (
103 ACPI_WALK_STATE *WalkState)
104 {
105 UINT32 i;
106
107
108 ACPI_FUNCTION_TRACE (DsMethodDataInit);
109
110
111 /* Init the method arguments */
112
113 for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++)
114 {
115 ACPI_MOVE_32_TO_32 (&WalkState->Arguments[i].Name, NAMEOF_ARG_NTE);
116 WalkState->Arguments[i].Name.Integer |= (i << 24);
117 WalkState->Arguments[i].DescriptorType = ACPI_DESC_TYPE_NAMED;
118 WalkState->Arguments[i].Type = ACPI_TYPE_ANY;
119 WalkState->Arguments[i].Flags = ANOBJ_METHOD_ARG;
120 }
121
122 /* Init the method locals */
123
124 for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++)
125 {
126 ACPI_MOVE_32_TO_32 (&WalkState->LocalVariables[i].Name, NAMEOF_LOCAL_NTE);
127
128 WalkState->LocalVariables[i].Name.Integer |= (i << 24);
129 WalkState->LocalVariables[i].DescriptorType = ACPI_DESC_TYPE_NAMED;
130 WalkState->LocalVariables[i].Type = ACPI_TYPE_ANY;
131 WalkState->LocalVariables[i].Flags = ANOBJ_METHOD_LOCAL;
132 }
133
134 return_VOID;
135 }
136
137
138 /*******************************************************************************
139 *
140 * FUNCTION: AcpiDsMethodDataDeleteAll
141 *
142 * PARAMETERS: WalkState - Current walk state object
143 *
144 * RETURN: None
145 *
146 * DESCRIPTION: Delete method locals and arguments. Arguments are only
147 * deleted if this method was called from another method.
148 *
149 ******************************************************************************/
150
151 void
152 AcpiDsMethodDataDeleteAll (
153 ACPI_WALK_STATE *WalkState)
154 {
155 UINT32 Index;
156
157
158 ACPI_FUNCTION_TRACE (DsMethodDataDeleteAll);
159
160
161 /* Detach the locals */
162
163 for (Index = 0; Index < ACPI_METHOD_NUM_LOCALS; Index++)
164 {
165 if (WalkState->LocalVariables[Index].Object)
166 {
167 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Local%u=%p\n",
168 Index, WalkState->LocalVariables[Index].Object));
169
170 /* Detach object (if present) and remove a reference */
171
172 AcpiNsDetachObject (&WalkState->LocalVariables[Index]);
173 }
174 }
175
176 /* Detach the arguments */
177
178 for (Index = 0; Index < ACPI_METHOD_NUM_ARGS; Index++)
179 {
180 if (WalkState->Arguments[Index].Object)
181 {
182 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Deleting Arg%u=%p\n",
183 Index, WalkState->Arguments[Index].Object));
184
185 /* Detach object (if present) and remove a reference */
186
187 AcpiNsDetachObject (&WalkState->Arguments[Index]);
188 }
189 }
190
191 return_VOID;
192 }
193
194
195 /*******************************************************************************
196 *
197 * FUNCTION: AcpiDsMethodDataInitArgs
198 *
199 * PARAMETERS: *Params - Pointer to a parameter list for the method
200 * MaxParamCount - The arg count for this method
201 * WalkState - Current walk state object
202 *
203 * RETURN: Status
204 *
205 * DESCRIPTION: Initialize arguments for a method. The parameter list is a list
206 * of ACPI operand objects, either null terminated or whose length
207 * is defined by MaxParamCount.
208 *
209 ******************************************************************************/
210
211 ACPI_STATUS
212 AcpiDsMethodDataInitArgs (
213 ACPI_OPERAND_OBJECT **Params,
214 UINT32 MaxParamCount,
215 ACPI_WALK_STATE *WalkState)
216 {
217 ACPI_STATUS Status;
218 UINT32 Index = 0;
219
220
221 ACPI_FUNCTION_TRACE_PTR (DsMethodDataInitArgs, Params);
222
223
224 if (!Params)
225 {
226 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "No param list passed to method\n"));
227 return_ACPI_STATUS (AE_OK);
228 }
229
230 /* Copy passed parameters into the new method stack frame */
231
232 while ((Index < ACPI_METHOD_NUM_ARGS) &&
233 (Index < MaxParamCount) &&
234 Params[Index])
235 {
236 /*
237 * A valid parameter.
238 * Store the argument in the method/walk descriptor.
239 * Do not copy the arg in order to implement call by reference
240 */
241 Status = AcpiDsMethodDataSetValue (ACPI_REFCLASS_ARG, Index,
242 Params[Index], WalkState);
243 if (ACPI_FAILURE (Status))
244 {
245 return_ACPI_STATUS (Status);
246 }
247
248 Index++;
249 }
250
251 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%u args passed to method\n", Index));
252 return_ACPI_STATUS (AE_OK);
253 }
254
255
256 /*******************************************************************************
257 *
258 * FUNCTION: AcpiDsMethodDataGetNode
259 *
260 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or
261 * ACPI_REFCLASS_ARG
262 * Index - Which Local or Arg whose type to get
263 * WalkState - Current walk state object
264 * Node - Where the node is returned.
265 *
266 * RETURN: Status and node
267 *
268 * DESCRIPTION: Get the Node associated with a local or arg.
269 *
270 ******************************************************************************/
271
272 ACPI_STATUS
273 AcpiDsMethodDataGetNode (
274 UINT8 Type,
275 UINT32 Index,
276 ACPI_WALK_STATE *WalkState,
277 ACPI_NAMESPACE_NODE **Node)
278 {
279 ACPI_FUNCTION_TRACE (DsMethodDataGetNode);
280
281
282 /*
283 * Method Locals and Arguments are supported
284 */
285 switch (Type)
286 {
287 case ACPI_REFCLASS_LOCAL:
288
289 if (Index > ACPI_METHOD_MAX_LOCAL)
290 {
291 ACPI_ERROR ((AE_INFO,
292 "Local index %u is invalid (max %u)",
293 Index, ACPI_METHOD_MAX_LOCAL));
294 return_ACPI_STATUS (AE_AML_INVALID_INDEX);
295 }
296
297 /* Return a pointer to the pseudo-node */
298
299 *Node = &WalkState->LocalVariables[Index];
300 break;
301
302 case ACPI_REFCLASS_ARG:
303
304 if (Index > ACPI_METHOD_MAX_ARG)
305 {
306 ACPI_ERROR ((AE_INFO,
307 "Arg index %u is invalid (max %u)",
308 Index, ACPI_METHOD_MAX_ARG));
309 return_ACPI_STATUS (AE_AML_INVALID_INDEX);
310 }
311
312 /* Return a pointer to the pseudo-node */
313
314 *Node = &WalkState->Arguments[Index];
315 break;
316
317 default:
318 ACPI_ERROR ((AE_INFO, "Type %u is invalid", Type));
319 return_ACPI_STATUS (AE_TYPE);
320 }
321
322 return_ACPI_STATUS (AE_OK);
323 }
324
325
326 /*******************************************************************************
327 *
328 * FUNCTION: AcpiDsMethodDataSetValue
329 *
330 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or
331 * ACPI_REFCLASS_ARG
332 * Index - Which Local or Arg to get
333 * Object - Object to be inserted into the stack entry
334 * WalkState - Current walk state object
335 *
336 * RETURN: Status
337 *
338 * DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
339 * Note: There is no "implicit conversion" for locals.
340 *
341 ******************************************************************************/
342
343 static ACPI_STATUS
344 AcpiDsMethodDataSetValue (
345 UINT8 Type,
346 UINT32 Index,
347 ACPI_OPERAND_OBJECT *Object,
348 ACPI_WALK_STATE *WalkState)
349 {
350 ACPI_STATUS Status;
351 ACPI_NAMESPACE_NODE *Node;
352
353
354 ACPI_FUNCTION_TRACE (DsMethodDataSetValue);
355
356
357 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
358 "NewObj %p Type %2.2X, Refs=%u [%s]\n", Object,
359 Type, Object->Common.ReferenceCount,
360 AcpiUtGetTypeName (Object->Common.Type)));
361
362 /* Get the namespace node for the arg/local */
363
364 Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
365 if (ACPI_FAILURE (Status))
366 {
367 return_ACPI_STATUS (Status);
368 }
369
370 /*
371 * Increment ref count so object can't be deleted while installed.
372 * NOTE: We do not copy the object in order to preserve the call by
373 * reference semantics of ACPI Control Method invocation.
374 * (See ACPI Specification 2.0C)
375 */
376 AcpiUtAddReference (Object);
377
378 /* Install the object */
379
380 Node->Object = Object;
381 return_ACPI_STATUS (Status);
382 }
383
384
385 /*******************************************************************************
386 *
387 * FUNCTION: AcpiDsMethodDataGetValue
388 *
389 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or
390 * ACPI_REFCLASS_ARG
391 * Index - Which localVar or argument to get
392 * WalkState - Current walk state object
393 * DestDesc - Where Arg or Local value is returned
394 *
395 * RETURN: Status
396 *
397 * DESCRIPTION: Retrieve value of selected Arg or Local for this method
398 * Used only in AcpiExResolveToValue().
399 *
400 ******************************************************************************/
401
402 ACPI_STATUS
403 AcpiDsMethodDataGetValue (
404 UINT8 Type,
405 UINT32 Index,
406 ACPI_WALK_STATE *WalkState,
407 ACPI_OPERAND_OBJECT **DestDesc)
408 {
409 ACPI_STATUS Status;
410 ACPI_NAMESPACE_NODE *Node;
411 ACPI_OPERAND_OBJECT *Object;
412
413
414 ACPI_FUNCTION_TRACE (DsMethodDataGetValue);
415
416
417 /* Validate the object descriptor */
418
419 if (!DestDesc)
420 {
421 ACPI_ERROR ((AE_INFO, "Null object descriptor pointer"));
422 return_ACPI_STATUS (AE_BAD_PARAMETER);
423 }
424
425 /* Get the namespace node for the arg/local */
426
427 Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
428 if (ACPI_FAILURE (Status))
429 {
430 return_ACPI_STATUS (Status);
431 }
432
433 /* Get the object from the node */
434
435 Object = Node->Object;
436
437 /* Examine the returned object, it must be valid. */
438
439 if (!Object)
440 {
441 /*
442 * Index points to uninitialized object.
443 * This means that either 1) The expected argument was
444 * not passed to the method, or 2) A local variable
445 * was referenced by the method (via the ASL)
446 * before it was initialized. Either case is an error.
447 */
448
449 /* If slack enabled, init the LocalX/ArgX to an Integer of value zero */
450
451 if (AcpiGbl_EnableInterpreterSlack)
452 {
453 Object = AcpiUtCreateIntegerObject ((UINT64) 0);
454 if (!Object)
455 {
456 return_ACPI_STATUS (AE_NO_MEMORY);
457 }
458
459 Node->Object = Object;
460 }
461
462 /* Otherwise, return the error */
463
464 else switch (Type)
465 {
466 case ACPI_REFCLASS_ARG:
467
468 ACPI_ERROR ((AE_INFO,
469 "Uninitialized Arg[%u] at node %p",
470 Index, Node));
471
472 return_ACPI_STATUS (AE_AML_UNINITIALIZED_ARG);
473
474 case ACPI_REFCLASS_LOCAL:
475
476 /*
477 * No error message for this case, will be trapped again later to
478 * detect and ignore cases of Store(LocalX,LocalX)
479 */
480 return_ACPI_STATUS (AE_AML_UNINITIALIZED_LOCAL);
481
482 default:
483
484 ACPI_ERROR ((AE_INFO, "Not a Arg/Local opcode: 0x%X", Type));
485 return_ACPI_STATUS (AE_AML_INTERNAL);
486 }
487 }
488
489 /*
490 * The Index points to an initialized and valid object.
491 * Return an additional reference to the object
492 */
493 *DestDesc = Object;
494 AcpiUtAddReference (Object);
495
496 return_ACPI_STATUS (AE_OK);
497 }
498
499
500 /*******************************************************************************
501 *
502 * FUNCTION: AcpiDsMethodDataDeleteValue
503 *
504 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or
505 * ACPI_REFCLASS_ARG
506 * Index - Which localVar or argument to delete
507 * WalkState - Current walk state object
508 *
509 * RETURN: None
510 *
511 * DESCRIPTION: Delete the entry at Opcode:Index. Inserts
512 * a null into the stack slot after the object is deleted.
513 *
514 ******************************************************************************/
515
516 static void
517 AcpiDsMethodDataDeleteValue (
518 UINT8 Type,
519 UINT32 Index,
520 ACPI_WALK_STATE *WalkState)
521 {
522 ACPI_STATUS Status;
523 ACPI_NAMESPACE_NODE *Node;
524 ACPI_OPERAND_OBJECT *Object;
525
526
527 ACPI_FUNCTION_TRACE (DsMethodDataDeleteValue);
528
529
530 /* Get the namespace node for the arg/local */
531
532 Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
533 if (ACPI_FAILURE (Status))
534 {
535 return_VOID;
536 }
537
538 /* Get the associated object */
539
540 Object = AcpiNsGetAttachedObject (Node);
541
542 /*
543 * Undefine the Arg or Local by setting its descriptor
544 * pointer to NULL. Locals/Args can contain both
545 * ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
546 */
547 Node->Object = NULL;
548
549 if ((Object) &&
550 (ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_OPERAND))
551 {
552 /*
553 * There is a valid object.
554 * Decrement the reference count by one to balance the
555 * increment when the object was stored.
556 */
557 AcpiUtRemoveReference (Object);
558 }
559
560 return_VOID;
561 }
562
563
564 /*******************************************************************************
565 *
566 * FUNCTION: AcpiDsStoreObjectToLocal
567 *
568 * PARAMETERS: Type - Either ACPI_REFCLASS_LOCAL or
569 * ACPI_REFCLASS_ARG
570 * Index - Which Local or Arg to set
571 * ObjDesc - Value to be stored
572 * WalkState - Current walk state
573 *
574 * RETURN: Status
575 *
576 * DESCRIPTION: Store a value in an Arg or Local. The ObjDesc is installed
577 * as the new value for the Arg or Local and the reference count
578 * for ObjDesc is incremented.
579 *
580 ******************************************************************************/
581
582 ACPI_STATUS
583 AcpiDsStoreObjectToLocal (
584 UINT8 Type,
585 UINT32 Index,
586 ACPI_OPERAND_OBJECT *ObjDesc,
587 ACPI_WALK_STATE *WalkState)
588 {
589 ACPI_STATUS Status;
590 ACPI_NAMESPACE_NODE *Node;
591 ACPI_OPERAND_OBJECT *CurrentObjDesc;
592 ACPI_OPERAND_OBJECT *NewObjDesc;
593
594
595 ACPI_FUNCTION_TRACE (DsStoreObjectToLocal);
596 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Type=%2.2X Index=%u Obj=%p\n",
597 Type, Index, ObjDesc));
598
599 /* Parameter validation */
600
601 if (!ObjDesc)
602 {
603 return_ACPI_STATUS (AE_BAD_PARAMETER);
604 }
605
606 /* Get the namespace node for the arg/local */
607
608 Status = AcpiDsMethodDataGetNode (Type, Index, WalkState, &Node);
609 if (ACPI_FAILURE (Status))
610 {
611 return_ACPI_STATUS (Status);
612 }
613
614 CurrentObjDesc = AcpiNsGetAttachedObject (Node);
615 if (CurrentObjDesc == ObjDesc)
616 {
617 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Obj=%p already installed!\n",
618 ObjDesc));
619 return_ACPI_STATUS (Status);
620 }
621
622 /*
623 * If the reference count on the object is more than one, we must
624 * take a copy of the object before we store. A reference count
625 * of exactly 1 means that the object was just created during the
626 * evaluation of an expression, and we can safely use it since it
627 * is not used anywhere else.
628 */
629 NewObjDesc = ObjDesc;
630 if (ObjDesc->Common.ReferenceCount > 1)
631 {
632 Status = AcpiUtCopyIobjectToIobject (ObjDesc, &NewObjDesc, WalkState);
633 if (ACPI_FAILURE (Status))
634 {
635 return_ACPI_STATUS (Status);
636 }
637 }
638
639 /*
640 * If there is an object already in this slot, we either
641 * have to delete it, or if this is an argument and there
642 * is an object reference stored there, we have to do
643 * an indirect store!
644 */
645 if (CurrentObjDesc)
646 {
647 /*
648 * Check for an indirect store if an argument
649 * contains an object reference (stored as an Node).
650 * We don't allow this automatic dereferencing for
651 * locals, since a store to a local should overwrite
652 * anything there, including an object reference.
653 *
654 * If both Arg0 and Local0 contain RefOf (Local4):
655 *
656 * Store (1, Arg0) - Causes indirect store to local4
657 * Store (1, Local0) - Stores 1 in local0, overwriting
658 * the reference to local4
659 * Store (1, DeRefof (Local0)) - Causes indirect store to local4
660 *
661 * Weird, but true.
662 */
663 if (Type == ACPI_REFCLASS_ARG)
664 {
665 /*
666 * If we have a valid reference object that came from RefOf(),
667 * do the indirect store
668 */
669 if ((ACPI_GET_DESCRIPTOR_TYPE (CurrentObjDesc) == ACPI_DESC_TYPE_OPERAND) &&
670 (CurrentObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
671 (CurrentObjDesc->Reference.Class == ACPI_REFCLASS_REFOF))
672 {
673 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
674 "Arg (%p) is an ObjRef(Node), storing in node %p\n",
675 NewObjDesc, CurrentObjDesc));
676
677 /*
678 * Store this object to the Node (perform the indirect store)
679 * NOTE: No implicit conversion is performed, as per the ACPI
680 * specification rules on storing to Locals/Args.
681 */
682 Status = AcpiExStoreObjectToNode (NewObjDesc,
683 CurrentObjDesc->Reference.Object, WalkState,
684 ACPI_NO_IMPLICIT_CONVERSION);
685
686 /* Remove local reference if we copied the object above */
687
688 if (NewObjDesc != ObjDesc)
689 {
690 AcpiUtRemoveReference (NewObjDesc);
691 }
692 return_ACPI_STATUS (Status);
693 }
694 }
695
696 /* Delete the existing object before storing the new one */
697
698 AcpiDsMethodDataDeleteValue (Type, Index, WalkState);
699 }
700
701 /*
702 * Install the Obj descriptor (*NewObjDesc) into
703 * the descriptor for the Arg or Local.
704 * (increments the object reference count by one)
705 */
706 Status = AcpiDsMethodDataSetValue (Type, Index, NewObjDesc, WalkState);
707
708 /* Remove local reference if we copied the object above */
709
710 if (NewObjDesc != ObjDesc)
711 {
712 AcpiUtRemoveReference (NewObjDesc);
713 }
714
715 return_ACPI_STATUS (Status);
716 }
717
718
719 #ifdef ACPI_OBSOLETE_FUNCTIONS
720 /*******************************************************************************
721 *
722 * FUNCTION: AcpiDsMethodDataGetType
723 *
724 * PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
725 * Index - Which Local or Arg whose type to get
726 * WalkState - Current walk state object
727 *
728 * RETURN: Data type of current value of the selected Arg or Local
729 *
730 * DESCRIPTION: Get the type of the object stored in the Local or Arg
731 *
732 ******************************************************************************/
733
734 ACPI_OBJECT_TYPE
735 AcpiDsMethodDataGetType (
736 UINT16 Opcode,
737 UINT32 Index,
738 ACPI_WALK_STATE *WalkState)
739 {
740 ACPI_STATUS Status;
741 ACPI_NAMESPACE_NODE *Node;
742 ACPI_OPERAND_OBJECT *Object;
743
744
745 ACPI_FUNCTION_TRACE (DsMethodDataGetType);
746
747
748 /* Get the namespace node for the arg/local */
749
750 Status = AcpiDsMethodDataGetNode (Opcode, Index, WalkState, &Node);
751 if (ACPI_FAILURE (Status))
752 {
753 return_VALUE ((ACPI_TYPE_NOT_FOUND));
754 }
755
756 /* Get the object */
757
758 Object = AcpiNsGetAttachedObject (Node);
759 if (!Object)
760 {
761 /* Uninitialized local/arg, return TYPE_ANY */
762
763 return_VALUE (ACPI_TYPE_ANY);
764 }
765
766 /* Get the object type */
767
768 return_VALUE (Object->Type);
769 }
770 #endif
771
772