1 /******************************************************************************
3 * Module Name: exresnte - AML Interpreter object resolution
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2014, Intel Corp.
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44 #define __EXRESNTE_C__
53 #define _COMPONENT ACPI_EXECUTER
54 ACPI_MODULE_NAME ("exresnte")
57 /*******************************************************************************
59 * FUNCTION: AcpiExResolveNodeToValue
61 * PARAMETERS: ObjectPtr - Pointer to a location that contains
62 * a pointer to a NS node, and will receive a
63 * pointer to the resolved object.
64 * WalkState - Current state. Valid only if executing AML
65 * code. NULL if simply resolving an object
69 * DESCRIPTION: Resolve a Namespace node to a valued object
71 * Note: for some of the data types, the pointer attached to the Node
72 * can be either a pointer to an actual internal object or a pointer into the
73 * AML stream itself. These types are currently:
81 ******************************************************************************/
84 AcpiExResolveNodeToValue (
85 ACPI_NAMESPACE_NODE **ObjectPtr,
86 ACPI_WALK_STATE *WalkState)
89 ACPI_STATUS Status = AE_OK;
90 ACPI_OPERAND_OBJECT *SourceDesc;
91 ACPI_OPERAND_OBJECT *ObjDesc = NULL;
92 ACPI_NAMESPACE_NODE *Node;
93 ACPI_OBJECT_TYPE EntryType;
96 ACPI_FUNCTION_TRACE (ExResolveNodeToValue);
100 * The stack pointer points to a ACPI_NAMESPACE_NODE (Node). Get the
101 * object that is attached to the Node.
104 SourceDesc = AcpiNsGetAttachedObject (Node);
105 EntryType = AcpiNsGetType ((ACPI_HANDLE) Node);
107 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
108 Node, SourceDesc, AcpiUtGetTypeName (EntryType)));
110 if ((EntryType == ACPI_TYPE_LOCAL_ALIAS) ||
111 (EntryType == ACPI_TYPE_LOCAL_METHOD_ALIAS))
113 /* There is always exactly one level of indirection */
115 Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object);
116 SourceDesc = AcpiNsGetAttachedObject (Node);
117 EntryType = AcpiNsGetType ((ACPI_HANDLE) Node);
122 * Several object types require no further processing:
123 * 1) Device/Thermal objects don't have a "real" subobject, return the Node
124 * 2) Method locals and arguments have a pseudo-Node
125 * 3) 10/2007: Added method type to assist with Package construction.
127 if ((EntryType == ACPI_TYPE_DEVICE) ||
128 (EntryType == ACPI_TYPE_THERMAL) ||
129 (EntryType == ACPI_TYPE_METHOD) ||
130 (Node->Flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL)))
132 return_ACPI_STATUS (AE_OK);
137 ACPI_ERROR ((AE_INFO, "No object attached to node [%4.4s] %p",
138 Node->Name.Ascii, Node));
139 return_ACPI_STATUS (AE_AML_NO_OPERAND);
143 * Action is based on the type of the Node, which indicates the type
144 * of the attached object or pointer
148 case ACPI_TYPE_PACKAGE:
150 if (SourceDesc->Common.Type != ACPI_TYPE_PACKAGE)
152 ACPI_ERROR ((AE_INFO, "Object not a Package, type %s",
153 AcpiUtGetObjectTypeName (SourceDesc)));
154 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
157 Status = AcpiDsGetPackageArguments (SourceDesc);
158 if (ACPI_SUCCESS (Status))
160 /* Return an additional reference to the object */
162 ObjDesc = SourceDesc;
163 AcpiUtAddReference (ObjDesc);
167 case ACPI_TYPE_BUFFER:
169 if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
171 ACPI_ERROR ((AE_INFO, "Object not a Buffer, type %s",
172 AcpiUtGetObjectTypeName (SourceDesc)));
173 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
176 Status = AcpiDsGetBufferArguments (SourceDesc);
177 if (ACPI_SUCCESS (Status))
179 /* Return an additional reference to the object */
181 ObjDesc = SourceDesc;
182 AcpiUtAddReference (ObjDesc);
186 case ACPI_TYPE_STRING:
188 if (SourceDesc->Common.Type != ACPI_TYPE_STRING)
190 ACPI_ERROR ((AE_INFO, "Object not a String, type %s",
191 AcpiUtGetObjectTypeName (SourceDesc)));
192 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
195 /* Return an additional reference to the object */
197 ObjDesc = SourceDesc;
198 AcpiUtAddReference (ObjDesc);
201 case ACPI_TYPE_INTEGER:
203 if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER)
205 ACPI_ERROR ((AE_INFO, "Object not a Integer, type %s",
206 AcpiUtGetObjectTypeName (SourceDesc)));
207 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
210 /* Return an additional reference to the object */
212 ObjDesc = SourceDesc;
213 AcpiUtAddReference (ObjDesc);
216 case ACPI_TYPE_BUFFER_FIELD:
217 case ACPI_TYPE_LOCAL_REGION_FIELD:
218 case ACPI_TYPE_LOCAL_BANK_FIELD:
219 case ACPI_TYPE_LOCAL_INDEX_FIELD:
221 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
222 "FieldRead Node=%p SourceDesc=%p Type=%X\n",
223 Node, SourceDesc, EntryType));
225 Status = AcpiExReadDataFromField (WalkState, SourceDesc, &ObjDesc);
228 /* For these objects, just return the object attached to the Node */
230 case ACPI_TYPE_MUTEX:
231 case ACPI_TYPE_POWER:
232 case ACPI_TYPE_PROCESSOR:
233 case ACPI_TYPE_EVENT:
234 case ACPI_TYPE_REGION:
236 /* Return an additional reference to the object */
238 ObjDesc = SourceDesc;
239 AcpiUtAddReference (ObjDesc);
242 /* TYPE_ANY is untyped, and thus there is no object associated with it */
246 ACPI_ERROR ((AE_INFO,
247 "Untyped entry %p, no attached object!", Node));
249 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); /* Cannot be AE_TYPE */
251 case ACPI_TYPE_LOCAL_REFERENCE:
253 switch (SourceDesc->Reference.Class)
255 case ACPI_REFCLASS_TABLE: /* This is a DdbHandle */
256 case ACPI_REFCLASS_REFOF:
257 case ACPI_REFCLASS_INDEX:
259 /* Return an additional reference to the object */
261 ObjDesc = SourceDesc;
262 AcpiUtAddReference (ObjDesc);
267 /* No named references are allowed here */
269 ACPI_ERROR ((AE_INFO,
270 "Unsupported Reference type 0x%X",
271 SourceDesc->Reference.Class));
273 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
279 /* Default case is for unknown types */
281 ACPI_ERROR ((AE_INFO,
282 "Node %p - Unknown object type 0x%X",
285 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
287 } /* switch (EntryType) */
290 /* Return the object descriptor */
292 *ObjectPtr = (void *) ObjDesc;
293 return_ACPI_STATUS (Status);