minor fixes for safecopy & safemap tests
[minix.git] / drivers / acpi / dispatcher / dsutils.c
blob7eb06372660fb620c58a32250d43d3cdd1dc46f9
1 /*******************************************************************************
3 * Module Name: dsutils - Dispatcher utilities
5 ******************************************************************************/
7 /******************************************************************************
9 * 1. Copyright Notice
11 * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp.
12 * All rights reserved.
14 * 2. License
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.
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
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;
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
40 * 3. Conditions
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.
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.
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.
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
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.
80 * 4. Disclaimer and Export Compliance
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.
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.
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.
114 *****************************************************************************/
116 #define __DSUTILS_C__
118 #include "acpi.h"
119 #include "accommon.h"
120 #include "acparser.h"
121 #include "amlcode.h"
122 #include "acdispat.h"
123 #include "acinterp.h"
124 #include "acnamesp.h"
125 #include "acdebug.h"
127 #define _COMPONENT ACPI_DISPATCHER
128 ACPI_MODULE_NAME ("dsutils")
131 /*******************************************************************************
133 * FUNCTION: AcpiDsClearImplicitReturn
135 * PARAMETERS: WalkState - Current State
137 * RETURN: None.
139 * DESCRIPTION: Clear and remove a reference on an implicit return value. Used
140 * to delete "stale" return values (if enabled, the return value
141 * from every operator is saved at least momentarily, in case the
142 * parent method exits.)
144 ******************************************************************************/
146 void
147 AcpiDsClearImplicitReturn (
148 ACPI_WALK_STATE *WalkState)
150 ACPI_FUNCTION_NAME (DsClearImplicitReturn);
154 * Slack must be enabled for this feature
156 if (!AcpiGbl_EnableInterpreterSlack)
158 return;
161 if (WalkState->ImplicitReturnObj)
164 * Delete any "stale" implicit return. However, in
165 * complex statements, the implicit return value can be
166 * bubbled up several levels.
168 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
169 "Removing reference on stale implicit return obj %p\n",
170 WalkState->ImplicitReturnObj));
172 AcpiUtRemoveReference (WalkState->ImplicitReturnObj);
173 WalkState->ImplicitReturnObj = NULL;
178 #ifndef ACPI_NO_METHOD_EXECUTION
179 /*******************************************************************************
181 * FUNCTION: AcpiDsDoImplicitReturn
183 * PARAMETERS: ReturnDesc - The return value
184 * WalkState - Current State
185 * AddReference - True if a reference should be added to the
186 * return object
188 * RETURN: TRUE if implicit return enabled, FALSE otherwise
190 * DESCRIPTION: Implements the optional "implicit return". We save the result
191 * of every ASL operator and control method invocation in case the
192 * parent method exit. Before storing a new return value, we
193 * delete the previous return value.
195 ******************************************************************************/
197 BOOLEAN
198 AcpiDsDoImplicitReturn (
199 ACPI_OPERAND_OBJECT *ReturnDesc,
200 ACPI_WALK_STATE *WalkState,
201 BOOLEAN AddReference)
203 ACPI_FUNCTION_NAME (DsDoImplicitReturn);
207 * Slack must be enabled for this feature, and we must
208 * have a valid return object
210 if ((!AcpiGbl_EnableInterpreterSlack) ||
211 (!ReturnDesc))
213 return (FALSE);
216 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
217 "Result %p will be implicitly returned; Prev=%p\n",
218 ReturnDesc,
219 WalkState->ImplicitReturnObj));
222 * Delete any "stale" implicit return value first. However, in
223 * complex statements, the implicit return value can be
224 * bubbled up several levels, so we don't clear the value if it
225 * is the same as the ReturnDesc.
227 if (WalkState->ImplicitReturnObj)
229 if (WalkState->ImplicitReturnObj == ReturnDesc)
231 return (TRUE);
233 AcpiDsClearImplicitReturn (WalkState);
236 /* Save the implicit return value, add a reference if requested */
238 WalkState->ImplicitReturnObj = ReturnDesc;
239 if (AddReference)
241 AcpiUtAddReference (ReturnDesc);
244 return (TRUE);
248 /*******************************************************************************
250 * FUNCTION: AcpiDsIsResultUsed
252 * PARAMETERS: Op - Current Op
253 * WalkState - Current State
255 * RETURN: TRUE if result is used, FALSE otherwise
257 * DESCRIPTION: Check if a result object will be used by the parent
259 ******************************************************************************/
261 BOOLEAN
262 AcpiDsIsResultUsed (
263 ACPI_PARSE_OBJECT *Op,
264 ACPI_WALK_STATE *WalkState)
266 const ACPI_OPCODE_INFO *ParentInfo;
268 ACPI_FUNCTION_TRACE_PTR (DsIsResultUsed, Op);
271 /* Must have both an Op and a Result Object */
273 if (!Op)
275 ACPI_ERROR ((AE_INFO, "Null Op"));
276 return_UINT8 (TRUE);
280 * We know that this operator is not a
281 * Return() operator (would not come here.) The following code is the
282 * optional support for a so-called "implicit return". Some AML code
283 * assumes that the last value of the method is "implicitly" returned
284 * to the caller. Just save the last result as the return value.
285 * NOTE: this is optional because the ASL language does not actually
286 * support this behavior.
288 (void) AcpiDsDoImplicitReturn (WalkState->ResultObj, WalkState, TRUE);
291 * Now determine if the parent will use the result
293 * If there is no parent, or the parent is a ScopeOp, we are executing
294 * at the method level. An executing method typically has no parent,
295 * since each method is parsed separately. A method invoked externally
296 * via ExecuteControlMethod has a ScopeOp as the parent.
298 if ((!Op->Common.Parent) ||
299 (Op->Common.Parent->Common.AmlOpcode == AML_SCOPE_OP))
301 /* No parent, the return value cannot possibly be used */
303 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
304 "At Method level, result of [%s] not used\n",
305 AcpiPsGetOpcodeName (Op->Common.AmlOpcode)));
306 return_UINT8 (FALSE);
309 /* Get info on the parent. The RootOp is AML_SCOPE */
311 ParentInfo = AcpiPsGetOpcodeInfo (Op->Common.Parent->Common.AmlOpcode);
312 if (ParentInfo->Class == AML_CLASS_UNKNOWN)
314 ACPI_ERROR ((AE_INFO,
315 "Unknown parent opcode Op=%p", Op));
316 return_UINT8 (FALSE);
320 * Decide what to do with the result based on the parent. If
321 * the parent opcode will not use the result, delete the object.
322 * Otherwise leave it as is, it will be deleted when it is used
323 * as an operand later.
325 switch (ParentInfo->Class)
327 case AML_CLASS_CONTROL:
329 switch (Op->Common.Parent->Common.AmlOpcode)
331 case AML_RETURN_OP:
333 /* Never delete the return value associated with a return opcode */
335 goto ResultUsed;
337 case AML_IF_OP:
338 case AML_WHILE_OP:
341 * If we are executing the predicate AND this is the predicate op,
342 * we will use the return value
344 if ((WalkState->ControlState->Common.State == ACPI_CONTROL_PREDICATE_EXECUTING) &&
345 (WalkState->ControlState->Control.PredicateOp == Op))
347 goto ResultUsed;
349 break;
351 default:
352 /* Ignore other control opcodes */
353 break;
356 /* The general control opcode returns no result */
358 goto ResultNotUsed;
361 case AML_CLASS_CREATE:
364 * These opcodes allow TermArg(s) as operands and therefore
365 * the operands can be method calls. The result is used.
367 goto ResultUsed;
370 case AML_CLASS_NAMED_OBJECT:
372 if ((Op->Common.Parent->Common.AmlOpcode == AML_REGION_OP) ||
373 (Op->Common.Parent->Common.AmlOpcode == AML_DATA_REGION_OP) ||
374 (Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
375 (Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP) ||
376 (Op->Common.Parent->Common.AmlOpcode == AML_BUFFER_OP) ||
377 (Op->Common.Parent->Common.AmlOpcode == AML_INT_EVAL_SUBTREE_OP) ||
378 (Op->Common.Parent->Common.AmlOpcode == AML_BANK_FIELD_OP))
381 * These opcodes allow TermArg(s) as operands and therefore
382 * the operands can be method calls. The result is used.
384 goto ResultUsed;
387 goto ResultNotUsed;
390 default:
393 * In all other cases. the parent will actually use the return
394 * object, so keep it.
396 goto ResultUsed;
400 ResultUsed:
401 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
402 "Result of [%s] used by Parent [%s] Op=%p\n",
403 AcpiPsGetOpcodeName (Op->Common.AmlOpcode),
404 AcpiPsGetOpcodeName (Op->Common.Parent->Common.AmlOpcode), Op));
406 return_UINT8 (TRUE);
409 ResultNotUsed:
410 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
411 "Result of [%s] not used by Parent [%s] Op=%p\n",
412 AcpiPsGetOpcodeName (Op->Common.AmlOpcode),
413 AcpiPsGetOpcodeName (Op->Common.Parent->Common.AmlOpcode), Op));
415 return_UINT8 (FALSE);
419 /*******************************************************************************
421 * FUNCTION: AcpiDsDeleteResultIfNotUsed
423 * PARAMETERS: Op - Current parse Op
424 * ResultObj - Result of the operation
425 * WalkState - Current state
427 * RETURN: Status
429 * DESCRIPTION: Used after interpretation of an opcode. If there is an internal
430 * result descriptor, check if the parent opcode will actually use
431 * this result. If not, delete the result now so that it will
432 * not become orphaned.
434 ******************************************************************************/
436 void
437 AcpiDsDeleteResultIfNotUsed (
438 ACPI_PARSE_OBJECT *Op,
439 ACPI_OPERAND_OBJECT *ResultObj,
440 ACPI_WALK_STATE *WalkState)
442 ACPI_OPERAND_OBJECT *ObjDesc;
443 ACPI_STATUS Status;
446 ACPI_FUNCTION_TRACE_PTR (DsDeleteResultIfNotUsed, ResultObj);
449 if (!Op)
451 ACPI_ERROR ((AE_INFO, "Null Op"));
452 return_VOID;
455 if (!ResultObj)
457 return_VOID;
460 if (!AcpiDsIsResultUsed (Op, WalkState))
462 /* Must pop the result stack (ObjDesc should be equal to ResultObj) */
464 Status = AcpiDsResultPop (&ObjDesc, WalkState);
465 if (ACPI_SUCCESS (Status))
467 AcpiUtRemoveReference (ResultObj);
471 return_VOID;
475 /*******************************************************************************
477 * FUNCTION: AcpiDsResolveOperands
479 * PARAMETERS: WalkState - Current walk state with operands on stack
481 * RETURN: Status
483 * DESCRIPTION: Resolve all operands to their values. Used to prepare
484 * arguments to a control method invocation (a call from one
485 * method to another.)
487 ******************************************************************************/
489 ACPI_STATUS
490 AcpiDsResolveOperands (
491 ACPI_WALK_STATE *WalkState)
493 UINT32 i;
494 ACPI_STATUS Status = AE_OK;
497 ACPI_FUNCTION_TRACE_PTR (DsResolveOperands, WalkState);
501 * Attempt to resolve each of the valid operands
502 * Method arguments are passed by reference, not by value. This means
503 * that the actual objects are passed, not copies of the objects.
505 for (i = 0; i < WalkState->NumOperands; i++)
507 Status = AcpiExResolveToValue (&WalkState->Operands[i], WalkState);
508 if (ACPI_FAILURE (Status))
510 break;
514 return_ACPI_STATUS (Status);
518 /*******************************************************************************
520 * FUNCTION: AcpiDsClearOperands
522 * PARAMETERS: WalkState - Current walk state with operands on stack
524 * RETURN: None
526 * DESCRIPTION: Clear all operands on the current walk state operand stack.
528 ******************************************************************************/
530 void
531 AcpiDsClearOperands (
532 ACPI_WALK_STATE *WalkState)
534 UINT32 i;
537 ACPI_FUNCTION_TRACE_PTR (DsClearOperands, WalkState);
540 /* Remove a reference on each operand on the stack */
542 for (i = 0; i < WalkState->NumOperands; i++)
545 * Remove a reference to all operands, including both
546 * "Arguments" and "Targets".
548 AcpiUtRemoveReference (WalkState->Operands[i]);
549 WalkState->Operands[i] = NULL;
552 WalkState->NumOperands = 0;
553 return_VOID;
555 #endif
558 /*******************************************************************************
560 * FUNCTION: AcpiDsCreateOperand
562 * PARAMETERS: WalkState - Current walk state
563 * Arg - Parse object for the argument
564 * ArgIndex - Which argument (zero based)
566 * RETURN: Status
568 * DESCRIPTION: Translate a parse tree object that is an argument to an AML
569 * opcode to the equivalent interpreter object. This may include
570 * looking up a name or entering a new name into the internal
571 * namespace.
573 ******************************************************************************/
575 ACPI_STATUS
576 AcpiDsCreateOperand (
577 ACPI_WALK_STATE *WalkState,
578 ACPI_PARSE_OBJECT *Arg,
579 UINT32 ArgIndex)
581 ACPI_STATUS Status = AE_OK;
582 char *NameString;
583 UINT32 NameLength;
584 ACPI_OPERAND_OBJECT *ObjDesc;
585 ACPI_PARSE_OBJECT *ParentOp;
586 UINT16 Opcode;
587 ACPI_INTERPRETER_MODE InterpreterMode;
588 const ACPI_OPCODE_INFO *OpInfo;
591 ACPI_FUNCTION_TRACE_PTR (DsCreateOperand, Arg);
594 /* A valid name must be looked up in the namespace */
596 if ((Arg->Common.AmlOpcode == AML_INT_NAMEPATH_OP) &&
597 (Arg->Common.Value.String) &&
598 !(Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
600 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", Arg));
602 /* Get the entire name string from the AML stream */
604 Status = AcpiExGetNameString (ACPI_TYPE_ANY, Arg->Common.Value.Buffer,
605 &NameString, &NameLength);
607 if (ACPI_FAILURE (Status))
609 return_ACPI_STATUS (Status);
612 /* All prefixes have been handled, and the name is in NameString */
615 * Special handling for BufferField declarations. This is a deferred
616 * opcode that unfortunately defines the field name as the last
617 * parameter instead of the first. We get here when we are performing
618 * the deferred execution, so the actual name of the field is already
619 * in the namespace. We don't want to attempt to look it up again
620 * because we may be executing in a different scope than where the
621 * actual opcode exists.
623 if ((WalkState->DeferredNode) &&
624 (WalkState->DeferredNode->Type == ACPI_TYPE_BUFFER_FIELD) &&
625 (ArgIndex == (UINT32) ((WalkState->Opcode == AML_CREATE_FIELD_OP) ? 3 : 2)))
627 ObjDesc = ACPI_CAST_PTR (
628 ACPI_OPERAND_OBJECT, WalkState->DeferredNode);
629 Status = AE_OK;
631 else /* All other opcodes */
634 * Differentiate between a namespace "create" operation
635 * versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
636 * IMODE_EXECUTE) in order to support the creation of
637 * namespace objects during the execution of control methods.
639 ParentOp = Arg->Common.Parent;
640 OpInfo = AcpiPsGetOpcodeInfo (ParentOp->Common.AmlOpcode);
641 if ((OpInfo->Flags & AML_NSNODE) &&
642 (ParentOp->Common.AmlOpcode != AML_INT_METHODCALL_OP) &&
643 (ParentOp->Common.AmlOpcode != AML_REGION_OP) &&
644 (ParentOp->Common.AmlOpcode != AML_INT_NAMEPATH_OP))
646 /* Enter name into namespace if not found */
648 InterpreterMode = ACPI_IMODE_LOAD_PASS2;
650 else
652 /* Return a failure if name not found */
654 InterpreterMode = ACPI_IMODE_EXECUTE;
657 Status = AcpiNsLookup (WalkState->ScopeInfo, NameString,
658 ACPI_TYPE_ANY, InterpreterMode,
659 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
660 WalkState,
661 ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, &ObjDesc));
663 * The only case where we pass through (ignore) a NOT_FOUND
664 * error is for the CondRefOf opcode.
666 if (Status == AE_NOT_FOUND)
668 if (ParentOp->Common.AmlOpcode == AML_COND_REF_OF_OP)
671 * For the Conditional Reference op, it's OK if
672 * the name is not found; We just need a way to
673 * indicate this to the interpreter, set the
674 * object to the root
676 ObjDesc = ACPI_CAST_PTR (
677 ACPI_OPERAND_OBJECT, AcpiGbl_RootNode);
678 Status = AE_OK;
680 else
683 * We just plain didn't find it -- which is a
684 * very serious error at this point
686 Status = AE_AML_NAME_NOT_FOUND;
690 if (ACPI_FAILURE (Status))
692 ACPI_ERROR_NAMESPACE (NameString, Status);
696 /* Free the namestring created above */
698 ACPI_FREE (NameString);
700 /* Check status from the lookup */
702 if (ACPI_FAILURE (Status))
704 return_ACPI_STATUS (Status);
707 /* Put the resulting object onto the current object stack */
709 Status = AcpiDsObjStackPush (ObjDesc, WalkState);
710 if (ACPI_FAILURE (Status))
712 return_ACPI_STATUS (Status);
714 ACPI_DEBUGGER_EXEC (AcpiDbDisplayArgumentObject (ObjDesc, WalkState));
716 else
718 /* Check for null name case */
720 if ((Arg->Common.AmlOpcode == AML_INT_NAMEPATH_OP) &&
721 !(Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
724 * If the name is null, this means that this is an
725 * optional result parameter that was not specified
726 * in the original ASL. Create a Zero Constant for a
727 * placeholder. (Store to a constant is a Noop.)
729 Opcode = AML_ZERO_OP; /* Has no arguments! */
731 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
732 "Null namepath: Arg=%p\n", Arg));
734 else
736 Opcode = Arg->Common.AmlOpcode;
739 /* Get the object type of the argument */
741 OpInfo = AcpiPsGetOpcodeInfo (Opcode);
742 if (OpInfo->ObjectType == ACPI_TYPE_INVALID)
744 return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
747 if ((OpInfo->Flags & AML_HAS_RETVAL) || (Arg->Common.Flags & ACPI_PARSEOP_IN_STACK))
749 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
750 "Argument previously created, already stacked\n"));
752 ACPI_DEBUGGER_EXEC (AcpiDbDisplayArgumentObject (
753 WalkState->Operands [WalkState->NumOperands - 1], WalkState));
756 * Use value that was already previously returned
757 * by the evaluation of this argument
759 Status = AcpiDsResultPop (&ObjDesc, WalkState);
760 if (ACPI_FAILURE (Status))
763 * Only error is underflow, and this indicates
764 * a missing or null operand!
766 ACPI_EXCEPTION ((AE_INFO, Status,
767 "Missing or null operand"));
768 return_ACPI_STATUS (Status);
771 else
773 /* Create an ACPI_INTERNAL_OBJECT for the argument */
775 ObjDesc = AcpiUtCreateInternalObject (OpInfo->ObjectType);
776 if (!ObjDesc)
778 return_ACPI_STATUS (AE_NO_MEMORY);
781 /* Initialize the new object */
783 Status = AcpiDsInitObjectFromOp (
784 WalkState, Arg, Opcode, &ObjDesc);
785 if (ACPI_FAILURE (Status))
787 AcpiUtDeleteObjectDesc (ObjDesc);
788 return_ACPI_STATUS (Status);
792 /* Put the operand object on the object stack */
794 Status = AcpiDsObjStackPush (ObjDesc, WalkState);
795 if (ACPI_FAILURE (Status))
797 return_ACPI_STATUS (Status);
800 ACPI_DEBUGGER_EXEC (AcpiDbDisplayArgumentObject (ObjDesc, WalkState));
803 return_ACPI_STATUS (AE_OK);
807 /*******************************************************************************
809 * FUNCTION: AcpiDsCreateOperands
811 * PARAMETERS: WalkState - Current state
812 * FirstArg - First argument of a parser argument tree
814 * RETURN: Status
816 * DESCRIPTION: Convert an operator's arguments from a parse tree format to
817 * namespace objects and place those argument object on the object
818 * stack in preparation for evaluation by the interpreter.
820 ******************************************************************************/
822 ACPI_STATUS
823 AcpiDsCreateOperands (
824 ACPI_WALK_STATE *WalkState,
825 ACPI_PARSE_OBJECT *FirstArg)
827 ACPI_STATUS Status = AE_OK;
828 ACPI_PARSE_OBJECT *Arg;
829 ACPI_PARSE_OBJECT *Arguments[ACPI_OBJ_NUM_OPERANDS];
830 UINT32 ArgCount = 0;
831 UINT32 Index = WalkState->NumOperands;
832 UINT32 i;
835 ACPI_FUNCTION_TRACE_PTR (DsCreateOperands, FirstArg);
838 /* Get all arguments in the list */
840 Arg = FirstArg;
841 while (Arg)
843 if (Index >= ACPI_OBJ_NUM_OPERANDS)
845 return_ACPI_STATUS (AE_BAD_DATA);
848 Arguments[Index] = Arg;
849 WalkState->Operands [Index] = NULL;
851 /* Move on to next argument, if any */
853 Arg = Arg->Common.Next;
854 ArgCount++;
855 Index++;
858 Index--;
860 /* It is the appropriate order to get objects from the Result stack */
862 for (i = 0; i < ArgCount; i++)
864 Arg = Arguments[Index];
866 /* Force the filling of the operand stack in inverse order */
868 WalkState->OperandIndex = (UINT8) Index;
870 Status = AcpiDsCreateOperand (WalkState, Arg, Index);
871 if (ACPI_FAILURE (Status))
873 goto Cleanup;
876 Index--;
878 ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Arg #%u (%p) done, Arg1=%p\n",
879 Index, Arg, FirstArg));
882 return_ACPI_STATUS (Status);
885 Cleanup:
887 * We must undo everything done above; meaning that we must
888 * pop everything off of the operand stack and delete those
889 * objects
891 AcpiDsObjStackPopAndDelete (ArgCount, WalkState);
893 ACPI_EXCEPTION ((AE_INFO, Status, "While creating Arg %u", Index));
894 return_ACPI_STATUS (Status);
898 /*****************************************************************************
900 * FUNCTION: AcpiDsEvaluateNamePath
902 * PARAMETERS: WalkState - Current state of the parse tree walk,
903 * the opcode of current operation should be
904 * AML_INT_NAMEPATH_OP
906 * RETURN: Status
908 * DESCRIPTION: Translate the -NamePath- parse tree object to the equivalent
909 * interpreter object, convert it to value, if needed, duplicate
910 * it, if needed, and push it onto the current result stack.
912 ****************************************************************************/
914 ACPI_STATUS
915 AcpiDsEvaluateNamePath (
916 ACPI_WALK_STATE *WalkState)
918 ACPI_STATUS Status = AE_OK;
919 ACPI_PARSE_OBJECT *Op = WalkState->Op;
920 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
921 ACPI_OPERAND_OBJECT *NewObjDesc;
922 UINT8 Type;
925 ACPI_FUNCTION_TRACE_PTR (DsEvaluateNamePath, WalkState);
928 if (!Op->Common.Parent)
930 /* This happens after certain exception processing */
932 goto Exit;
935 if ((Op->Common.Parent->Common.AmlOpcode == AML_PACKAGE_OP) ||
936 (Op->Common.Parent->Common.AmlOpcode == AML_VAR_PACKAGE_OP) ||
937 (Op->Common.Parent->Common.AmlOpcode == AML_REF_OF_OP))
939 /* TBD: Should we specify this feature as a bit of OpInfo->Flags of these opcodes? */
941 goto Exit;
944 Status = AcpiDsCreateOperand (WalkState, Op, 0);
945 if (ACPI_FAILURE (Status))
947 goto Exit;
950 if (Op->Common.Flags & ACPI_PARSEOP_TARGET)
952 NewObjDesc = *Operand;
953 goto PushResult;
956 Type = (*Operand)->Common.Type;
958 Status = AcpiExResolveToValue (Operand, WalkState);
959 if (ACPI_FAILURE (Status))
961 goto Exit;
964 if (Type == ACPI_TYPE_INTEGER)
966 /* It was incremented by AcpiExResolveToValue */
968 AcpiUtRemoveReference (*Operand);
970 Status = AcpiUtCopyIobjectToIobject (*Operand, &NewObjDesc, WalkState);
971 if (ACPI_FAILURE (Status))
973 goto Exit;
976 else
979 * The object either was anew created or is
980 * a Namespace node - don't decrement it.
982 NewObjDesc = *Operand;
985 /* Cleanup for name-path operand */
987 Status = AcpiDsObjStackPop (1, WalkState);
988 if (ACPI_FAILURE (Status))
990 WalkState->ResultObj = NewObjDesc;
991 goto Exit;
994 PushResult:
996 WalkState->ResultObj = NewObjDesc;
998 Status = AcpiDsResultPush (WalkState->ResultObj, WalkState);
999 if (ACPI_SUCCESS (Status))
1001 /* Force to take it from stack */
1003 Op->Common.Flags |= ACPI_PARSEOP_IN_STACK;
1006 Exit:
1008 return_ACPI_STATUS (Status);