1 /******************************************************************************
2 *
3 * Module Name: exresnte - AML Interpreter object resolution
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
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.
25 *
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.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #define __EXRESNTE_C__
45
46 #include "acpi.h"
47 #include "accommon.h"
48 #include "acdispat.h"
49 #include "acinterp.h"
50 #include "acnamesp.h"
51
52
53 #define _COMPONENT ACPI_EXECUTER
54 ACPI_MODULE_NAME ("exresnte")
55
56
57 /*******************************************************************************
58 *
59 * FUNCTION: AcpiExResolveNodeToValue
60 *
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
66 *
67 * RETURN: Status
68 *
69 * DESCRIPTION: Resolve a Namespace node to a valued object
70 *
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:
74 *
75 * ACPI_TYPE_INTEGER
76 * ACPI_TYPE_STRING
77 * ACPI_TYPE_BUFFER
78 * ACPI_TYPE_MUTEX
79 * ACPI_TYPE_PACKAGE
80 *
81 ******************************************************************************/
82
83 ACPI_STATUS
84 AcpiExResolveNodeToValue (
85 ACPI_NAMESPACE_NODE **ObjectPtr,
86 ACPI_WALK_STATE *WalkState)
87
88 {
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;
94
95
96 ACPI_FUNCTION_TRACE (ExResolveNodeToValue);
97
98
99 /*
100 * The stack pointer points to a ACPI_NAMESPACE_NODE (Node). Get the
101 * object that is attached to the Node.
102 */
103 Node = *ObjectPtr;
104 SourceDesc = AcpiNsGetAttachedObject (Node);
105 EntryType = AcpiNsGetType ((ACPI_HANDLE) Node);
106
107 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
108 Node, SourceDesc, AcpiUtGetTypeName (EntryType)));
109
110 if ((EntryType == ACPI_TYPE_LOCAL_ALIAS) ||
111 (EntryType == ACPI_TYPE_LOCAL_METHOD_ALIAS))
112 {
113 /* There is always exactly one level of indirection */
114
115 Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object);
116 SourceDesc = AcpiNsGetAttachedObject (Node);
117 EntryType = AcpiNsGetType ((ACPI_HANDLE) Node);
118 *ObjectPtr = Node;
119 }
120
121 /*
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.
126 */
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)))
131 {
132 return_ACPI_STATUS (AE_OK);
133 }
134
135 if (!SourceDesc)
136 {
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);
140 }
141
142 /*
143 * Action is based on the type of the Node, which indicates the type
144 * of the attached object or pointer
145 */
146 switch (EntryType)
147 {
148 case ACPI_TYPE_PACKAGE:
149
150 if (SourceDesc->Common.Type != ACPI_TYPE_PACKAGE)
151 {
152 ACPI_ERROR ((AE_INFO, "Object not a Package, type %s",
153 AcpiUtGetObjectTypeName (SourceDesc)));
154 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
155 }
156
157 Status = AcpiDsGetPackageArguments (SourceDesc);
158 if (ACPI_SUCCESS (Status))
159 {
160 /* Return an additional reference to the object */
161
162 ObjDesc = SourceDesc;
163 AcpiUtAddReference (ObjDesc);
164 }
165 break;
166
167 case ACPI_TYPE_BUFFER:
168
169 if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
170 {
171 ACPI_ERROR ((AE_INFO, "Object not a Buffer, type %s",
172 AcpiUtGetObjectTypeName (SourceDesc)));
173 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
174 }
175
176 Status = AcpiDsGetBufferArguments (SourceDesc);
177 if (ACPI_SUCCESS (Status))
178 {
179 /* Return an additional reference to the object */
180
181 ObjDesc = SourceDesc;
182 AcpiUtAddReference (ObjDesc);
183 }
184 break;
185
186 case ACPI_TYPE_STRING:
187
188 if (SourceDesc->Common.Type != ACPI_TYPE_STRING)
189 {
190 ACPI_ERROR ((AE_INFO, "Object not a String, type %s",
191 AcpiUtGetObjectTypeName (SourceDesc)));
192 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
193 }
194
195 /* Return an additional reference to the object */
196
197 ObjDesc = SourceDesc;
198 AcpiUtAddReference (ObjDesc);
199 break;
200
201 case ACPI_TYPE_INTEGER:
202
203 if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER)
204 {
205 ACPI_ERROR ((AE_INFO, "Object not a Integer, type %s",
206 AcpiUtGetObjectTypeName (SourceDesc)));
207 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
208 }
209
210 /* Return an additional reference to the object */
211
212 ObjDesc = SourceDesc;
213 AcpiUtAddReference (ObjDesc);
214 break;
215
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:
220
221 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
222 "FieldRead Node=%p SourceDesc=%p Type=%X\n",
223 Node, SourceDesc, EntryType));
224
225 Status = AcpiExReadDataFromField (WalkState, SourceDesc, &ObjDesc);
226 break;
227
228 /* For these objects, just return the object attached to the Node */
229
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:
235
236 /* Return an additional reference to the object */
237
238 ObjDesc = SourceDesc;
239 AcpiUtAddReference (ObjDesc);
240 break;
241
242 /* TYPE_ANY is untyped, and thus there is no object associated with it */
243
244 case ACPI_TYPE_ANY:
245
246 ACPI_ERROR ((AE_INFO,
247 "Untyped entry %p, no attached object!", Node));
248
249 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); /* Cannot be AE_TYPE */
250
251 case ACPI_TYPE_LOCAL_REFERENCE:
252
253 switch (SourceDesc->Reference.Class)
254 {
255 case ACPI_REFCLASS_TABLE: /* This is a DdbHandle */
256 case ACPI_REFCLASS_REFOF:
257 case ACPI_REFCLASS_INDEX:
258
259 /* Return an additional reference to the object */
260
261 ObjDesc = SourceDesc;
262 AcpiUtAddReference (ObjDesc);
263 break;
264
265 default:
266
267 /* No named references are allowed here */
268
269 ACPI_ERROR ((AE_INFO,
270 "Unsupported Reference type 0x%X",
271 SourceDesc->Reference.Class));
272
273 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
274 }
275 break;
276
277 default:
278
279 /* Default case is for unknown types */
280
281 ACPI_ERROR ((AE_INFO,
282 "Node %p - Unknown object type 0x%X",
283 Node, EntryType));
284
285 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
286
287 } /* switch (EntryType) */
288
289
290 /* Return the object descriptor */
291
292 *ObjectPtr = (void *) ObjDesc;
293 return_ACPI_STATUS (Status);
294 }