1 /******************************************************************************
3 * Module Name: exstoren - AML Interpreter object store support,
4 * Store to Node (namespace object)
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2015, Intel Corp.
10 * All rights reserved.
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13 * modification, are permitted provided that the following conditions
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21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
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24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
27 * Alternatively, this software may be distributed under the terms of the
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29 * Software Foundation.
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51 #define _COMPONENT ACPI_EXECUTER
52 ACPI_MODULE_NAME ("exstoren")
55 /*******************************************************************************
57 * FUNCTION: AcpiExResolveObject
59 * PARAMETERS: SourceDescPtr - Pointer to the source object
60 * TargetType - Current type of the target
61 * WalkState - Current walk state
63 * RETURN: Status, resolved object in SourceDescPtr.
65 * DESCRIPTION: Resolve an object. If the object is a reference, dereference
66 * it and return the actual object in the SourceDescPtr.
68 ******************************************************************************/
72 ACPI_OPERAND_OBJECT **SourceDescPtr,
73 ACPI_OBJECT_TYPE TargetType,
74 ACPI_WALK_STATE *WalkState)
76 ACPI_OPERAND_OBJECT *SourceDesc = *SourceDescPtr;
77 ACPI_STATUS Status = AE_OK;
80 ACPI_FUNCTION_TRACE (ExResolveObject);
83 /* Ensure we have a Target that can be stored to */
87 case ACPI_TYPE_BUFFER_FIELD:
88 case ACPI_TYPE_LOCAL_REGION_FIELD:
89 case ACPI_TYPE_LOCAL_BANK_FIELD:
90 case ACPI_TYPE_LOCAL_INDEX_FIELD:
92 * These cases all require only Integers or values that
93 * can be converted to Integers (Strings or Buffers)
95 case ACPI_TYPE_INTEGER:
96 case ACPI_TYPE_STRING:
97 case ACPI_TYPE_BUFFER:
99 * Stores into a Field/Region or into a Integer/Buffer/String
100 * are all essentially the same. This case handles the
101 * "interchangeable" types Integer, String, and Buffer.
103 if (SourceDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE)
105 /* Resolve a reference object first */
107 Status = AcpiExResolveToValue (SourceDescPtr, WalkState);
108 if (ACPI_FAILURE (Status))
114 /* For CopyObject, no further validation necessary */
116 if (WalkState->Opcode == AML_COPY_OP)
121 /* Must have a Integer, Buffer, or String */
123 if ((SourceDesc->Common.Type != ACPI_TYPE_INTEGER) &&
124 (SourceDesc->Common.Type != ACPI_TYPE_BUFFER) &&
125 (SourceDesc->Common.Type != ACPI_TYPE_STRING) &&
126 !((SourceDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE) &&
127 (SourceDesc->Reference.Class== ACPI_REFCLASS_TABLE)))
129 /* Conversion successful but still not a valid type */
131 ACPI_ERROR ((AE_INFO,
132 "Cannot assign type %s to %s (must be type Int/Str/Buf)",
133 AcpiUtGetObjectTypeName (SourceDesc),
134 AcpiUtGetTypeName (TargetType)));
135 Status = AE_AML_OPERAND_TYPE;
139 case ACPI_TYPE_LOCAL_ALIAS:
140 case ACPI_TYPE_LOCAL_METHOD_ALIAS:
142 * All aliases should have been resolved earlier, during the
143 * operand resolution phase.
145 ACPI_ERROR ((AE_INFO, "Store into an unresolved Alias object"));
146 Status = AE_AML_INTERNAL;
149 case ACPI_TYPE_PACKAGE:
152 * All other types than Alias and the various Fields come here,
153 * including the untyped case - ACPI_TYPE_ANY.
158 return_ACPI_STATUS (Status);
162 /*******************************************************************************
164 * FUNCTION: AcpiExStoreObjectToObject
166 * PARAMETERS: SourceDesc - Object to store
167 * DestDesc - Object to receive a copy of the source
168 * NewDesc - New object if DestDesc is obsoleted
169 * WalkState - Current walk state
173 * DESCRIPTION: "Store" an object to another object. This may include
174 * converting the source type to the target type (implicit
175 * conversion), and a copy of the value of the source to
178 * The Assignment of an object to another (not named) object
180 * The Source passed in will replace the current value (if any)
181 * with the input value.
183 * When storing into an object the data is converted to the
184 * target object type then stored in the object. This means
185 * that the target object type (for an initialized target) will
186 * not be changed by a store operation.
188 * This module allows destination types of Number, String,
189 * Buffer, and Package.
191 * Assumes parameters are already validated. NOTE: SourceDesc
192 * resolution (from a reference object) must be performed by
193 * the caller if necessary.
195 ******************************************************************************/
198 AcpiExStoreObjectToObject (
199 ACPI_OPERAND_OBJECT *SourceDesc,
200 ACPI_OPERAND_OBJECT *DestDesc,
201 ACPI_OPERAND_OBJECT **NewDesc,
202 ACPI_WALK_STATE *WalkState)
204 ACPI_OPERAND_OBJECT *ActualSrcDesc;
205 ACPI_STATUS Status = AE_OK;
208 ACPI_FUNCTION_TRACE_PTR (ExStoreObjectToObject, SourceDesc);
211 ActualSrcDesc = SourceDesc;
215 * There is no destination object (An uninitialized node or
216 * package element), so we can simply copy the source object
217 * creating a new destination object
219 Status = AcpiUtCopyIobjectToIobject (ActualSrcDesc, NewDesc, WalkState);
220 return_ACPI_STATUS (Status);
223 if (SourceDesc->Common.Type != DestDesc->Common.Type)
226 * The source type does not match the type of the destination.
227 * Perform the "implicit conversion" of the source to the current type
228 * of the target as per the ACPI specification.
230 * If no conversion performed, ActualSrcDesc = SourceDesc.
231 * Otherwise, ActualSrcDesc is a temporary object to hold the
234 Status = AcpiExConvertToTargetType (DestDesc->Common.Type,
235 SourceDesc, &ActualSrcDesc, WalkState);
236 if (ACPI_FAILURE (Status))
238 return_ACPI_STATUS (Status);
241 if (SourceDesc == ActualSrcDesc)
244 * No conversion was performed. Return the SourceDesc as the
247 *NewDesc = SourceDesc;
248 return_ACPI_STATUS (AE_OK);
253 * We now have two objects of identical types, and we can perform a
254 * copy of the *value* of the source object.
256 switch (DestDesc->Common.Type)
258 case ACPI_TYPE_INTEGER:
260 DestDesc->Integer.Value = ActualSrcDesc->Integer.Value;
262 /* Truncate value if we are executing from a 32-bit ACPI table */
264 (void) AcpiExTruncateFor32bitTable (DestDesc);
267 case ACPI_TYPE_STRING:
269 Status = AcpiExStoreStringToString (ActualSrcDesc, DestDesc);
272 case ACPI_TYPE_BUFFER:
274 Status = AcpiExStoreBufferToBuffer (ActualSrcDesc, DestDesc);
277 case ACPI_TYPE_PACKAGE:
279 Status = AcpiUtCopyIobjectToIobject (ActualSrcDesc, &DestDesc,
285 * All other types come here.
287 ACPI_WARNING ((AE_INFO, "Store into type %s not implemented",
288 AcpiUtGetObjectTypeName (DestDesc)));
290 Status = AE_NOT_IMPLEMENTED;
294 if (ActualSrcDesc != SourceDesc)
296 /* Delete the intermediate (temporary) source object */
298 AcpiUtRemoveReference (ActualSrcDesc);
302 return_ACPI_STATUS (Status);