1 /******************************************************************************
3 * Module Name: exoparg1 - AML execution - opcodes with 1 argument
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2015, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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41 * POSSIBILITY OF SUCH DAMAGES.
53 #define _COMPONENT ACPI_EXECUTER
54 ACPI_MODULE_NAME ("exoparg1")
58 * Naming convention for AML interpreter execution routines.
60 * The routines that begin execution of AML opcodes are named with a common
61 * convention based upon the number of arguments, the number of target operands,
62 * and whether or not a value is returned:
64 * AcpiExOpcode_xA_yT_zR
68 * xA - ARGUMENTS: The number of arguments (input operands) that are
69 * required for this opcode type (0 through 6 args).
70 * yT - TARGETS: The number of targets (output operands) that are required
71 * for this opcode type (0, 1, or 2 targets).
72 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
73 * as the function return (0 or 1).
75 * The AcpiExOpcode* functions are called via the Dispatcher component with
76 * fully resolved operands.
79 /*******************************************************************************
81 * FUNCTION: AcpiExOpcode_0A_0T_1R
83 * PARAMETERS: WalkState - Current state (contains AML opcode)
87 * DESCRIPTION: Execute operator with no operands, one return value
89 ******************************************************************************/
92 AcpiExOpcode_0A_0T_1R (
93 ACPI_WALK_STATE *WalkState)
95 ACPI_STATUS Status = AE_OK;
96 ACPI_OPERAND_OBJECT *ReturnDesc = NULL;
99 ACPI_FUNCTION_TRACE_STR (ExOpcode_0A_0T_1R,
100 AcpiPsGetOpcodeName (WalkState->Opcode));
103 /* Examine the AML opcode */
105 switch (WalkState->Opcode)
107 case AML_TIMER_OP: /* Timer () */
109 /* Create a return object of type Integer */
111 ReturnDesc = AcpiUtCreateIntegerObject (AcpiOsGetTimer ());
114 Status = AE_NO_MEMORY;
119 default: /* Unknown opcode */
121 ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
123 Status = AE_AML_BAD_OPCODE;
129 /* Delete return object on error */
131 if ((ACPI_FAILURE (Status)) || WalkState->ResultObj)
133 AcpiUtRemoveReference (ReturnDesc);
134 WalkState->ResultObj = NULL;
138 /* Save the return value */
140 WalkState->ResultObj = ReturnDesc;
143 return_ACPI_STATUS (Status);
147 /*******************************************************************************
149 * FUNCTION: AcpiExOpcode_1A_0T_0R
151 * PARAMETERS: WalkState - Current state (contains AML opcode)
155 * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
158 ******************************************************************************/
161 AcpiExOpcode_1A_0T_0R (
162 ACPI_WALK_STATE *WalkState)
164 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
165 ACPI_STATUS Status = AE_OK;
168 ACPI_FUNCTION_TRACE_STR (ExOpcode_1A_0T_0R,
169 AcpiPsGetOpcodeName (WalkState->Opcode));
172 /* Examine the AML opcode */
174 switch (WalkState->Opcode)
176 case AML_RELEASE_OP: /* Release (MutexObject) */
178 Status = AcpiExReleaseMutex (Operand[0], WalkState);
181 case AML_RESET_OP: /* Reset (EventObject) */
183 Status = AcpiExSystemResetEvent (Operand[0]);
186 case AML_SIGNAL_OP: /* Signal (EventObject) */
188 Status = AcpiExSystemSignalEvent (Operand[0]);
191 case AML_SLEEP_OP: /* Sleep (MsecTime) */
193 Status = AcpiExSystemDoSleep (Operand[0]->Integer.Value);
196 case AML_STALL_OP: /* Stall (UsecTime) */
198 Status = AcpiExSystemDoStall ((UINT32) Operand[0]->Integer.Value);
201 case AML_UNLOAD_OP: /* Unload (Handle) */
203 Status = AcpiExUnloadTable (Operand[0]);
206 default: /* Unknown opcode */
208 ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
210 Status = AE_AML_BAD_OPCODE;
214 return_ACPI_STATUS (Status);
218 /*******************************************************************************
220 * FUNCTION: AcpiExOpcode_1A_1T_0R
222 * PARAMETERS: WalkState - Current state (contains AML opcode)
226 * DESCRIPTION: Execute opcode with one argument, one target, and no
229 ******************************************************************************/
232 AcpiExOpcode_1A_1T_0R (
233 ACPI_WALK_STATE *WalkState)
235 ACPI_STATUS Status = AE_OK;
236 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
239 ACPI_FUNCTION_TRACE_STR (ExOpcode_1A_1T_0R,
240 AcpiPsGetOpcodeName (WalkState->Opcode));
243 /* Examine the AML opcode */
245 switch (WalkState->Opcode)
249 Status = AcpiExLoadOp (Operand[0], Operand[1], WalkState);
252 default: /* Unknown opcode */
254 ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
256 Status = AE_AML_BAD_OPCODE;
263 return_ACPI_STATUS (Status);
267 /*******************************************************************************
269 * FUNCTION: AcpiExOpcode_1A_1T_1R
271 * PARAMETERS: WalkState - Current state (contains AML opcode)
275 * DESCRIPTION: Execute opcode with one argument, one target, and a
278 ******************************************************************************/
281 AcpiExOpcode_1A_1T_1R (
282 ACPI_WALK_STATE *WalkState)
284 ACPI_STATUS Status = AE_OK;
285 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
286 ACPI_OPERAND_OBJECT *ReturnDesc = NULL;
287 ACPI_OPERAND_OBJECT *ReturnDesc2 = NULL;
294 ACPI_FUNCTION_TRACE_STR (ExOpcode_1A_1T_1R,
295 AcpiPsGetOpcodeName (WalkState->Opcode));
298 /* Examine the AML opcode */
300 switch (WalkState->Opcode)
303 case AML_FIND_SET_LEFT_BIT_OP:
304 case AML_FIND_SET_RIGHT_BIT_OP:
305 case AML_FROM_BCD_OP:
307 case AML_COND_REF_OF_OP:
309 /* Create a return object of type Integer for these opcodes */
311 ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
314 Status = AE_NO_MEMORY;
318 switch (WalkState->Opcode)
320 case AML_BIT_NOT_OP: /* Not (Operand, Result) */
322 ReturnDesc->Integer.Value = ~Operand[0]->Integer.Value;
325 case AML_FIND_SET_LEFT_BIT_OP: /* FindSetLeftBit (Operand, Result) */
327 ReturnDesc->Integer.Value = Operand[0]->Integer.Value;
330 * Acpi specification describes Integer type as a little
331 * endian unsigned value, so this boundary condition is valid.
333 for (Temp32 = 0; ReturnDesc->Integer.Value &&
334 Temp32 < ACPI_INTEGER_BIT_SIZE; ++Temp32)
336 ReturnDesc->Integer.Value >>= 1;
339 ReturnDesc->Integer.Value = Temp32;
342 case AML_FIND_SET_RIGHT_BIT_OP: /* FindSetRightBit (Operand, Result) */
344 ReturnDesc->Integer.Value = Operand[0]->Integer.Value;
347 * The Acpi specification describes Integer type as a little
348 * endian unsigned value, so this boundary condition is valid.
350 for (Temp32 = 0; ReturnDesc->Integer.Value &&
351 Temp32 < ACPI_INTEGER_BIT_SIZE; ++Temp32)
353 ReturnDesc->Integer.Value <<= 1;
356 /* Since the bit position is one-based, subtract from 33 (65) */
358 ReturnDesc->Integer.Value =
359 Temp32 == 0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - Temp32;
362 case AML_FROM_BCD_OP: /* FromBcd (BCDValue, Result) */
364 * The 64-bit ACPI integer can hold 16 4-bit BCD characters
365 * (if table is 32-bit, integer can hold 8 BCD characters)
366 * Convert each 4-bit BCD value
369 ReturnDesc->Integer.Value = 0;
370 Digit = Operand[0]->Integer.Value;
372 /* Convert each BCD digit (each is one nybble wide) */
374 for (i = 0; (i < AcpiGbl_IntegerNybbleWidth) && (Digit > 0); i++)
376 /* Get the least significant 4-bit BCD digit */
378 Temp32 = ((UINT32) Digit) & 0xF;
380 /* Check the range of the digit */
384 ACPI_ERROR ((AE_INFO,
385 "BCD digit too large (not decimal): 0x%X",
388 Status = AE_AML_NUMERIC_OVERFLOW;
392 /* Sum the digit into the result with the current power of 10 */
394 ReturnDesc->Integer.Value +=
395 (((UINT64) Temp32) * PowerOfTen);
397 /* Shift to next BCD digit */
401 /* Next power of 10 */
407 case AML_TO_BCD_OP: /* ToBcd (Operand, Result) */
409 ReturnDesc->Integer.Value = 0;
410 Digit = Operand[0]->Integer.Value;
412 /* Each BCD digit is one nybble wide */
414 for (i = 0; (i < AcpiGbl_IntegerNybbleWidth) && (Digit > 0); i++)
416 (void) AcpiUtShortDivide (Digit, 10, &Digit, &Temp32);
419 * Insert the BCD digit that resides in the
420 * remainder from above
422 ReturnDesc->Integer.Value |=
423 (((UINT64) Temp32) << ACPI_MUL_4 (i));
426 /* Overflow if there is any data left in Digit */
430 ACPI_ERROR ((AE_INFO,
431 "Integer too large to convert to BCD: 0x%8.8X%8.8X",
432 ACPI_FORMAT_UINT64 (Operand[0]->Integer.Value)));
433 Status = AE_AML_NUMERIC_OVERFLOW;
438 case AML_COND_REF_OF_OP: /* CondRefOf (SourceObject, Result) */
440 * This op is a little strange because the internal return value is
441 * different than the return value stored in the result descriptor
442 * (There are really two return values)
444 if ((ACPI_NAMESPACE_NODE *) Operand[0] == AcpiGbl_RootNode)
447 * This means that the object does not exist in the namespace,
450 ReturnDesc->Integer.Value = 0;
454 /* Get the object reference, store it, and remove our reference */
456 Status = AcpiExGetObjectReference (Operand[0],
457 &ReturnDesc2, WalkState);
458 if (ACPI_FAILURE (Status))
463 Status = AcpiExStore (ReturnDesc2, Operand[1], WalkState);
464 AcpiUtRemoveReference (ReturnDesc2);
466 /* The object exists in the namespace, return TRUE */
468 ReturnDesc->Integer.Value = ACPI_UINT64_MAX;
474 /* No other opcodes get here */
480 case AML_STORE_OP: /* Store (Source, Target) */
482 * A store operand is typically a number, string, buffer or lvalue
483 * Be careful about deleting the source object,
484 * since the object itself may have been stored.
486 Status = AcpiExStore (Operand[0], Operand[1], WalkState);
487 if (ACPI_FAILURE (Status))
489 return_ACPI_STATUS (Status);
492 /* It is possible that the Store already produced a return object */
494 if (!WalkState->ResultObj)
497 * Normally, we would remove a reference on the Operand[0]
498 * parameter; But since it is being used as the internal return
499 * object (meaning we would normally increment it), the two
500 * cancel out, and we simply don't do anything.
502 WalkState->ResultObj = Operand[0];
503 WalkState->Operands[0] = NULL; /* Prevent deletion */
505 return_ACPI_STATUS (Status);
510 case AML_COPY_OP: /* Copy (Source, Target) */
512 Status = AcpiUtCopyIobjectToIobject (Operand[0], &ReturnDesc,
516 case AML_TO_DECSTRING_OP: /* ToDecimalString (Data, Result) */
518 Status = AcpiExConvertToString (Operand[0], &ReturnDesc,
519 ACPI_EXPLICIT_CONVERT_DECIMAL);
520 if (ReturnDesc == Operand[0])
522 /* No conversion performed, add ref to handle return value */
523 AcpiUtAddReference (ReturnDesc);
527 case AML_TO_HEXSTRING_OP: /* ToHexString (Data, Result) */
529 Status = AcpiExConvertToString (Operand[0], &ReturnDesc,
530 ACPI_EXPLICIT_CONVERT_HEX);
531 if (ReturnDesc == Operand[0])
533 /* No conversion performed, add ref to handle return value */
534 AcpiUtAddReference (ReturnDesc);
538 case AML_TO_BUFFER_OP: /* ToBuffer (Data, Result) */
540 Status = AcpiExConvertToBuffer (Operand[0], &ReturnDesc);
541 if (ReturnDesc == Operand[0])
543 /* No conversion performed, add ref to handle return value */
544 AcpiUtAddReference (ReturnDesc);
548 case AML_TO_INTEGER_OP: /* ToInteger (Data, Result) */
550 Status = AcpiExConvertToInteger (Operand[0], &ReturnDesc,
552 if (ReturnDesc == Operand[0])
554 /* No conversion performed, add ref to handle return value */
555 AcpiUtAddReference (ReturnDesc);
559 case AML_SHIFT_LEFT_BIT_OP: /* ShiftLeftBit (Source, BitNum) */
560 case AML_SHIFT_RIGHT_BIT_OP: /* ShiftRightBit (Source, BitNum) */
562 /* These are two obsolete opcodes */
564 ACPI_ERROR ((AE_INFO,
565 "%s is obsolete and not implemented",
566 AcpiPsGetOpcodeName (WalkState->Opcode)));
570 default: /* Unknown opcode */
572 ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
574 Status = AE_AML_BAD_OPCODE;
578 if (ACPI_SUCCESS (Status))
580 /* Store the return value computed above into the target object */
582 Status = AcpiExStore (ReturnDesc, Operand[1], WalkState);
588 /* Delete return object on error */
590 if (ACPI_FAILURE (Status))
592 AcpiUtRemoveReference (ReturnDesc);
595 /* Save return object on success */
597 else if (!WalkState->ResultObj)
599 WalkState->ResultObj = ReturnDesc;
602 return_ACPI_STATUS (Status);
606 /*******************************************************************************
608 * FUNCTION: AcpiExOpcode_1A_0T_1R
610 * PARAMETERS: WalkState - Current state (contains AML opcode)
614 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
616 ******************************************************************************/
619 AcpiExOpcode_1A_0T_1R (
620 ACPI_WALK_STATE *WalkState)
622 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
623 ACPI_OPERAND_OBJECT *TempDesc;
624 ACPI_OPERAND_OBJECT *ReturnDesc = NULL;
625 ACPI_STATUS Status = AE_OK;
630 ACPI_FUNCTION_TRACE_STR (ExOpcode_1A_0T_1R,
631 AcpiPsGetOpcodeName (WalkState->Opcode));
634 /* Examine the AML opcode */
636 switch (WalkState->Opcode)
638 case AML_LNOT_OP: /* LNot (Operand) */
640 ReturnDesc = AcpiUtCreateIntegerObject ((UINT64) 0);
643 Status = AE_NO_MEMORY;
648 * Set result to ONES (TRUE) if Value == 0. Note:
649 * ReturnDesc->Integer.Value is initially == 0 (FALSE) from above.
651 if (!Operand[0]->Integer.Value)
653 ReturnDesc->Integer.Value = ACPI_UINT64_MAX;
657 case AML_DECREMENT_OP: /* Decrement (Operand) */
658 case AML_INCREMENT_OP: /* Increment (Operand) */
660 * Create a new integer. Can't just get the base integer and
661 * increment it because it may be an Arg or Field.
663 ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
666 Status = AE_NO_MEMORY;
671 * Since we are expecting a Reference operand, it can be either a
672 * NS Node or an internal object.
674 TempDesc = Operand[0];
675 if (ACPI_GET_DESCRIPTOR_TYPE (TempDesc) == ACPI_DESC_TYPE_OPERAND)
677 /* Internal reference object - prevent deletion */
679 AcpiUtAddReference (TempDesc);
683 * Convert the Reference operand to an Integer (This removes a
684 * reference on the Operand[0] object)
686 * NOTE: We use LNOT_OP here in order to force resolution of the
687 * reference operand to an actual integer.
689 Status = AcpiExResolveOperands (AML_LNOT_OP, &TempDesc, WalkState);
690 if (ACPI_FAILURE (Status))
692 ACPI_EXCEPTION ((AE_INFO, Status,
693 "While resolving operands for [%s]",
694 AcpiPsGetOpcodeName (WalkState->Opcode)));
700 * TempDesc is now guaranteed to be an Integer object --
701 * Perform the actual increment or decrement
703 if (WalkState->Opcode == AML_INCREMENT_OP)
705 ReturnDesc->Integer.Value = TempDesc->Integer.Value +1;
709 ReturnDesc->Integer.Value = TempDesc->Integer.Value -1;
712 /* Finished with this Integer object */
714 AcpiUtRemoveReference (TempDesc);
717 * Store the result back (indirectly) through the original
720 Status = AcpiExStore (ReturnDesc, Operand[0], WalkState);
723 case AML_TYPE_OP: /* ObjectType (SourceObject) */
725 * Note: The operand is not resolved at this point because we want to
726 * get the associated object, not its value. For example, we don't
727 * want to resolve a FieldUnit to its value, we want the actual
731 /* Get the type of the base object */
733 Status = AcpiExResolveMultiple (WalkState, Operand[0], &Type, NULL);
734 if (ACPI_FAILURE (Status))
739 /* Allocate a descriptor to hold the type. */
741 ReturnDesc = AcpiUtCreateIntegerObject ((UINT64) Type);
744 Status = AE_NO_MEMORY;
749 case AML_SIZE_OF_OP: /* SizeOf (SourceObject) */
751 * Note: The operand is not resolved at this point because we want to
752 * get the associated object, not its value.
755 /* Get the base object */
757 Status = AcpiExResolveMultiple (WalkState,
758 Operand[0], &Type, &TempDesc);
759 if (ACPI_FAILURE (Status))
765 * The type of the base object must be integer, buffer, string, or
766 * package. All others are not supported.
768 * NOTE: Integer is not specifically supported by the ACPI spec,
769 * but is supported implicitly via implicit operand conversion.
770 * rather than bother with conversion, we just use the byte width
771 * global (4 or 8 bytes).
775 case ACPI_TYPE_INTEGER:
777 Value = AcpiGbl_IntegerByteWidth;
780 case ACPI_TYPE_STRING:
782 Value = TempDesc->String.Length;
785 case ACPI_TYPE_BUFFER:
787 /* Buffer arguments may not be evaluated at this point */
789 Status = AcpiDsGetBufferArguments (TempDesc);
790 Value = TempDesc->Buffer.Length;
793 case ACPI_TYPE_PACKAGE:
795 /* Package arguments may not be evaluated at this point */
797 Status = AcpiDsGetPackageArguments (TempDesc);
798 Value = TempDesc->Package.Count;
803 ACPI_ERROR ((AE_INFO,
804 "Operand must be Buffer/Integer/String/Package - found type %s",
805 AcpiUtGetTypeName (Type)));
806 Status = AE_AML_OPERAND_TYPE;
810 if (ACPI_FAILURE (Status))
816 * Now that we have the size of the object, create a result
817 * object to hold the value
819 ReturnDesc = AcpiUtCreateIntegerObject (Value);
822 Status = AE_NO_MEMORY;
828 case AML_REF_OF_OP: /* RefOf (SourceObject) */
830 Status = AcpiExGetObjectReference (Operand[0], &ReturnDesc, WalkState);
831 if (ACPI_FAILURE (Status))
838 case AML_DEREF_OF_OP: /* DerefOf (ObjReference | String) */
840 /* Check for a method local or argument, or standalone String */
842 if (ACPI_GET_DESCRIPTOR_TYPE (Operand[0]) == ACPI_DESC_TYPE_NAMED)
844 TempDesc = AcpiNsGetAttachedObject (
845 (ACPI_NAMESPACE_NODE *) Operand[0]);
847 ((TempDesc->Common.Type == ACPI_TYPE_STRING) ||
848 (TempDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE)))
850 Operand[0] = TempDesc;
851 AcpiUtAddReference (TempDesc);
855 Status = AE_AML_OPERAND_TYPE;
861 switch ((Operand[0])->Common.Type)
863 case ACPI_TYPE_LOCAL_REFERENCE:
865 * This is a DerefOf (LocalX | ArgX)
867 * Must resolve/dereference the local/arg reference first
869 switch (Operand[0]->Reference.Class)
871 case ACPI_REFCLASS_LOCAL:
872 case ACPI_REFCLASS_ARG:
874 /* Set Operand[0] to the value of the local/arg */
876 Status = AcpiDsMethodDataGetValue (
877 Operand[0]->Reference.Class,
878 Operand[0]->Reference.Value,
879 WalkState, &TempDesc);
880 if (ACPI_FAILURE (Status))
886 * Delete our reference to the input object and
887 * point to the object just retrieved
889 AcpiUtRemoveReference (Operand[0]);
890 Operand[0] = TempDesc;
893 case ACPI_REFCLASS_REFOF:
895 /* Get the object to which the reference refers */
897 TempDesc = Operand[0]->Reference.Object;
898 AcpiUtRemoveReference (Operand[0]);
899 Operand[0] = TempDesc;
904 /* Must be an Index op - handled below */
909 case ACPI_TYPE_STRING:
915 Status = AE_AML_OPERAND_TYPE;
920 if (ACPI_GET_DESCRIPTOR_TYPE (Operand[0]) != ACPI_DESC_TYPE_NAMED)
922 if ((Operand[0])->Common.Type == ACPI_TYPE_STRING)
925 * This is a DerefOf (String). The string is a reference
926 * to a named ACPI object.
928 * 1) Find the owning Node
929 * 2) Dereference the node to an actual object. Could be a
930 * Field, so we need to resolve the node to a value.
932 Status = AcpiNsGetNode (WalkState->ScopeInfo->Scope.Node,
933 Operand[0]->String.Pointer,
934 ACPI_NS_SEARCH_PARENT,
935 ACPI_CAST_INDIRECT_PTR (
936 ACPI_NAMESPACE_NODE, &ReturnDesc));
937 if (ACPI_FAILURE (Status))
942 Status = AcpiExResolveNodeToValue (
943 ACPI_CAST_INDIRECT_PTR (
944 ACPI_NAMESPACE_NODE, &ReturnDesc),
950 /* Operand[0] may have changed from the code above */
952 if (ACPI_GET_DESCRIPTOR_TYPE (Operand[0]) == ACPI_DESC_TYPE_NAMED)
955 * This is a DerefOf (ObjectReference)
956 * Get the actual object from the Node (This is the dereference).
957 * This case may only happen when a LocalX or ArgX is
958 * dereferenced above.
960 ReturnDesc = AcpiNsGetAttachedObject (
961 (ACPI_NAMESPACE_NODE *) Operand[0]);
962 AcpiUtAddReference (ReturnDesc);
967 * This must be a reference object produced by either the
968 * Index() or RefOf() operator
970 switch (Operand[0]->Reference.Class)
972 case ACPI_REFCLASS_INDEX:
974 * The target type for the Index operator must be
975 * either a Buffer or a Package
977 switch (Operand[0]->Reference.TargetType)
979 case ACPI_TYPE_BUFFER_FIELD:
981 TempDesc = Operand[0]->Reference.Object;
984 * Create a new object that contains one element of the
985 * buffer -- the element pointed to by the index.
987 * NOTE: index into a buffer is NOT a pointer to a
988 * sub-buffer of the main buffer, it is only a pointer to a
989 * single element (byte) of the buffer!
991 * Since we are returning the value of the buffer at the
992 * indexed location, we don't need to add an additional
993 * reference to the buffer itself.
995 ReturnDesc = AcpiUtCreateIntegerObject ((UINT64)
996 TempDesc->Buffer.Pointer[Operand[0]->Reference.Value]);
999 Status = AE_NO_MEMORY;
1004 case ACPI_TYPE_PACKAGE:
1006 * Return the referenced element of the package. We must
1007 * add another reference to the referenced object, however.
1009 ReturnDesc = *(Operand[0]->Reference.Where);
1013 * Element is NULL, do not allow the dereference.
1014 * This provides compatibility with other ACPI
1017 return_ACPI_STATUS (AE_AML_UNINITIALIZED_ELEMENT);
1020 AcpiUtAddReference (ReturnDesc);
1025 ACPI_ERROR ((AE_INFO,
1026 "Unknown Index TargetType 0x%X in reference object %p",
1027 Operand[0]->Reference.TargetType, Operand[0]));
1028 Status = AE_AML_OPERAND_TYPE;
1033 case ACPI_REFCLASS_REFOF:
1035 ReturnDesc = Operand[0]->Reference.Object;
1037 if (ACPI_GET_DESCRIPTOR_TYPE (ReturnDesc) ==
1038 ACPI_DESC_TYPE_NAMED)
1040 ReturnDesc = AcpiNsGetAttachedObject (
1041 (ACPI_NAMESPACE_NODE *) ReturnDesc);
1049 * BufferFields/FieldUnits require additional resolution
1051 switch (ReturnDesc->Common.Type)
1053 case ACPI_TYPE_BUFFER_FIELD:
1054 case ACPI_TYPE_LOCAL_REGION_FIELD:
1055 case ACPI_TYPE_LOCAL_BANK_FIELD:
1056 case ACPI_TYPE_LOCAL_INDEX_FIELD:
1058 Status = AcpiExReadDataFromField (WalkState,
1059 ReturnDesc, &TempDesc);
1060 if (ACPI_FAILURE (Status))
1065 ReturnDesc = TempDesc;
1070 /* Add another reference to the object */
1072 AcpiUtAddReference (ReturnDesc);
1080 ACPI_ERROR ((AE_INFO,
1081 "Unknown class in reference(%p) - 0x%2.2X",
1082 Operand[0], Operand[0]->Reference.Class));
1092 ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
1093 WalkState->Opcode));
1094 Status = AE_AML_BAD_OPCODE;
1101 /* Delete return object on error */
1103 if (ACPI_FAILURE (Status))
1105 AcpiUtRemoveReference (ReturnDesc);
1108 /* Save return object on success */
1112 WalkState->ResultObj = ReturnDesc;
1115 return_ACPI_STATUS (Status);