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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21 * including a substantially similar Disclaimer requirement for further
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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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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)));
136 Status = AE_AML_OPERAND_TYPE;
140 case ACPI_TYPE_LOCAL_ALIAS:
141 case ACPI_TYPE_LOCAL_METHOD_ALIAS:
143 * All aliases should have been resolved earlier, during the
144 * operand resolution phase.
146 ACPI_ERROR ((AE_INFO, "Store into an unresolved Alias object"));
147 Status = AE_AML_INTERNAL;
150 case ACPI_TYPE_PACKAGE:
153 * All other types than Alias and the various Fields come here,
154 * including the untyped case - ACPI_TYPE_ANY.
159 return_ACPI_STATUS (Status);
163 /*******************************************************************************
165 * FUNCTION: AcpiExStoreObjectToObject
167 * PARAMETERS: SourceDesc - Object to store
168 * DestDesc - Object to receive a copy of the source
169 * NewDesc - New object if DestDesc is obsoleted
170 * WalkState - Current walk state
174 * DESCRIPTION: "Store" an object to another object. This may include
175 * converting the source type to the target type (implicit
176 * conversion), and a copy of the value of the source to
179 * The Assignment of an object to another (not named) object
181 * The Source passed in will replace the current value (if any)
182 * with the input value.
184 * When storing into an object the data is converted to the
185 * target object type then stored in the object. This means
186 * that the target object type (for an initialized target) will
187 * not be changed by a store operation.
189 * This module allows destination types of Number, String,
190 * Buffer, and Package.
192 * Assumes parameters are already validated. NOTE: SourceDesc
193 * resolution (from a reference object) must be performed by
194 * the caller if necessary.
196 ******************************************************************************/
199 AcpiExStoreObjectToObject (
200 ACPI_OPERAND_OBJECT *SourceDesc,
201 ACPI_OPERAND_OBJECT *DestDesc,
202 ACPI_OPERAND_OBJECT **NewDesc,
203 ACPI_WALK_STATE *WalkState)
205 ACPI_OPERAND_OBJECT *ActualSrcDesc;
206 ACPI_STATUS Status = AE_OK;
209 ACPI_FUNCTION_TRACE_PTR (ExStoreObjectToObject, SourceDesc);
212 ActualSrcDesc = SourceDesc;
216 * There is no destination object (An uninitialized node or
217 * package element), so we can simply copy the source object
218 * creating a new destination object
220 Status = AcpiUtCopyIobjectToIobject (ActualSrcDesc, NewDesc, WalkState);
221 return_ACPI_STATUS (Status);
224 if (SourceDesc->Common.Type != DestDesc->Common.Type)
227 * The source type does not match the type of the destination.
228 * Perform the "implicit conversion" of the source to the current type
229 * of the target as per the ACPI specification.
231 * If no conversion performed, ActualSrcDesc = SourceDesc.
232 * Otherwise, ActualSrcDesc is a temporary object to hold the
235 Status = AcpiExConvertToTargetType (DestDesc->Common.Type,
236 SourceDesc, &ActualSrcDesc, WalkState);
237 if (ACPI_FAILURE (Status))
239 return_ACPI_STATUS (Status);
242 if (SourceDesc == ActualSrcDesc)
245 * No conversion was performed. Return the SourceDesc as the
248 *NewDesc = SourceDesc;
249 return_ACPI_STATUS (AE_OK);
254 * We now have two objects of identical types, and we can perform a
255 * copy of the *value* of the source object.
257 switch (DestDesc->Common.Type)
259 case ACPI_TYPE_INTEGER:
261 DestDesc->Integer.Value = ActualSrcDesc->Integer.Value;
263 /* Truncate value if we are executing from a 32-bit ACPI table */
265 (void) AcpiExTruncateFor32bitTable (DestDesc);
268 case ACPI_TYPE_STRING:
270 Status = AcpiExStoreStringToString (ActualSrcDesc, DestDesc);
273 case ACPI_TYPE_BUFFER:
275 Status = AcpiExStoreBufferToBuffer (ActualSrcDesc, DestDesc);
278 case ACPI_TYPE_PACKAGE:
280 Status = AcpiUtCopyIobjectToIobject (ActualSrcDesc, &DestDesc,
286 * All other types come here.
288 ACPI_WARNING ((AE_INFO, "Store into type [%s] not implemented",
289 AcpiUtGetObjectTypeName (DestDesc)));
291 Status = AE_NOT_IMPLEMENTED;
295 if (ActualSrcDesc != SourceDesc)
297 /* Delete the intermediate (temporary) source object */
299 AcpiUtRemoveReference (ActualSrcDesc);
303 return_ACPI_STATUS (Status);