1
2 /******************************************************************************
3 *
4 * Module Name: exresnte - AML Interpreter object resolution
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2011, Intel Corp.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
30 *
31 * NO WARRANTY
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45 #define __EXRESNTE_C__
46
47 #include "acpi.h"
48 #include "accommon.h"
49 #include "acdispat.h"
50 #include "acinterp.h"
51 #include "acnamesp.h"
52
53
54 #define _COMPONENT ACPI_EXECUTER
55 ACPI_MODULE_NAME ("exresnte")
56
57
58 /*******************************************************************************
59 *
60 * FUNCTION: AcpiExResolveNodeToValue
61 *
62 * PARAMETERS: ObjectPtr - Pointer to a location that contains
63 * a pointer to a NS node, and will receive a
64 * pointer to the resolved object.
65 * WalkState - Current state. Valid only if executing AML
66 * code. NULL if simply resolving an object
67 *
68 * RETURN: Status
69 *
70 * DESCRIPTION: Resolve a Namespace node to a valued object
71 *
72 * Note: for some of the data types, the pointer attached to the Node
73 * can be either a pointer to an actual internal object or a pointer into the
74 * AML stream itself. These types are currently:
75 *
76 * ACPI_TYPE_INTEGER
77 * ACPI_TYPE_STRING
78 * ACPI_TYPE_BUFFER
79 * ACPI_TYPE_MUTEX
80 * ACPI_TYPE_PACKAGE
81 *
82 ******************************************************************************/
83
84 ACPI_STATUS
85 AcpiExResolveNodeToValue (
86 ACPI_NAMESPACE_NODE **ObjectPtr,
87 ACPI_WALK_STATE *WalkState)
88
89 {
90 ACPI_STATUS Status = AE_OK;
91 ACPI_OPERAND_OBJECT *SourceDesc;
92 ACPI_OPERAND_OBJECT *ObjDesc = NULL;
93 ACPI_NAMESPACE_NODE *Node;
94 ACPI_OBJECT_TYPE EntryType;
95
96
97 ACPI_FUNCTION_TRACE (ExResolveNodeToValue);
98
99
100 /*
101 * The stack pointer points to a ACPI_NAMESPACE_NODE (Node). Get the
102 * object that is attached to the Node.
103 */
104 Node = *ObjectPtr;
105 SourceDesc = AcpiNsGetAttachedObject (Node);
106 EntryType = AcpiNsGetType ((ACPI_HANDLE) Node);
107
108 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
109 Node, SourceDesc, AcpiUtGetTypeName (EntryType)));
110
111 if ((EntryType == ACPI_TYPE_LOCAL_ALIAS) ||
112 (EntryType == ACPI_TYPE_LOCAL_METHOD_ALIAS))
113 {
114 /* There is always exactly one level of indirection */
115
116 Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object);
117 SourceDesc = AcpiNsGetAttachedObject (Node);
118 EntryType = AcpiNsGetType ((ACPI_HANDLE) Node);
119 *ObjectPtr = Node;
120 }
121
122 /*
123 * Several object types require no further processing:
124 * 1) Device/Thermal objects don't have a "real" subobject, return the Node
125 * 2) Method locals and arguments have a pseudo-Node
126 * 3) 10/2007: Added method type to assist with Package construction.
127 */
128 if ((EntryType == ACPI_TYPE_DEVICE) ||
129 (EntryType == ACPI_TYPE_THERMAL) ||
130 (EntryType == ACPI_TYPE_METHOD) ||
131 (Node->Flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL)))
132 {
133 return_ACPI_STATUS (AE_OK);
134 }
135
136 if (!SourceDesc)
137 {
138 ACPI_ERROR ((AE_INFO, "No object attached to node %p",
139 Node));
140 return_ACPI_STATUS (AE_AML_NO_OPERAND);
141 }
142
143 /*
144 * Action is based on the type of the Node, which indicates the type
145 * of the attached object or pointer
146 */
147 switch (EntryType)
148 {
149 case ACPI_TYPE_PACKAGE:
150
151 if (SourceDesc->Common.Type != ACPI_TYPE_PACKAGE)
152 {
153 ACPI_ERROR ((AE_INFO, "Object not a Package, type %s",
154 AcpiUtGetObjectTypeName (SourceDesc)));
155 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
156 }
157
158 Status = AcpiDsGetPackageArguments (SourceDesc);
159 if (ACPI_SUCCESS (Status))
160 {
161 /* Return an additional reference to the object */
162
163 ObjDesc = SourceDesc;
164 AcpiUtAddReference (ObjDesc);
165 }
166 break;
167
168
169 case ACPI_TYPE_BUFFER:
170
171 if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
172 {
173 ACPI_ERROR ((AE_INFO, "Object not a Buffer, type %s",
174 AcpiUtGetObjectTypeName (SourceDesc)));
175 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
176 }
177
178 Status = AcpiDsGetBufferArguments (SourceDesc);
179 if (ACPI_SUCCESS (Status))
180 {
181 /* Return an additional reference to the object */
182
183 ObjDesc = SourceDesc;
184 AcpiUtAddReference (ObjDesc);
185 }
186 break;
187
188
189 case ACPI_TYPE_STRING:
190
191 if (SourceDesc->Common.Type != ACPI_TYPE_STRING)
192 {
193 ACPI_ERROR ((AE_INFO, "Object not a String, type %s",
194 AcpiUtGetObjectTypeName (SourceDesc)));
195 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
196 }
197
198 /* Return an additional reference to the object */
199
200 ObjDesc = SourceDesc;
201 AcpiUtAddReference (ObjDesc);
202 break;
203
204
205 case ACPI_TYPE_INTEGER:
206
207 if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER)
208 {
209 ACPI_ERROR ((AE_INFO, "Object not a Integer, type %s",
210 AcpiUtGetObjectTypeName (SourceDesc)));
211 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
212 }
213
214 /* Return an additional reference to the object */
215
216 ObjDesc = SourceDesc;
217 AcpiUtAddReference (ObjDesc);
218 break;
219
220
221 case ACPI_TYPE_BUFFER_FIELD:
222 case ACPI_TYPE_LOCAL_REGION_FIELD:
223 case ACPI_TYPE_LOCAL_BANK_FIELD:
224 case ACPI_TYPE_LOCAL_INDEX_FIELD:
225
226 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
227 "FieldRead Node=%p SourceDesc=%p Type=%X\n",
228 Node, SourceDesc, EntryType));
229
230 Status = AcpiExReadDataFromField (WalkState, SourceDesc, &ObjDesc);
231 break;
232
233 /* For these objects, just return the object attached to the Node */
234
235 case ACPI_TYPE_MUTEX:
236 case ACPI_TYPE_POWER:
237 case ACPI_TYPE_PROCESSOR:
238 case ACPI_TYPE_EVENT:
239 case ACPI_TYPE_REGION:
240
241 /* Return an additional reference to the object */
242
243 ObjDesc = SourceDesc;
244 AcpiUtAddReference (ObjDesc);
245 break;
246
247 /* TYPE_ANY is untyped, and thus there is no object associated with it */
248
249 case ACPI_TYPE_ANY:
250
251 ACPI_ERROR ((AE_INFO,
252 "Untyped entry %p, no attached object!", Node));
253
254 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); /* Cannot be AE_TYPE */
255
256
257 case ACPI_TYPE_LOCAL_REFERENCE:
258
259 switch (SourceDesc->Reference.Class)
260 {
261 case ACPI_REFCLASS_TABLE: /* This is a DdbHandle */
262 case ACPI_REFCLASS_REFOF:
263 case ACPI_REFCLASS_INDEX:
264
265 /* Return an additional reference to the object */
266
267 ObjDesc = SourceDesc;
268 AcpiUtAddReference (ObjDesc);
269 break;
270
271 default:
272 /* No named references are allowed here */
273
274 ACPI_ERROR ((AE_INFO,
275 "Unsupported Reference type 0x%X",
276 SourceDesc->Reference.Class));
277
278 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
279 }
280 break;
281
282
283 default:
284
285 /* Default case is for unknown types */
286
287 ACPI_ERROR ((AE_INFO,
288 "Node %p - Unknown object type 0x%X",
289 Node, EntryType));
290
291 return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
292
293 } /* switch (EntryType) */
294
295
296 /* Return the object descriptor */
297
298 *ObjectPtr = (void *) ObjDesc;
299 return_ACPI_STATUS (Status);
300 }
301
302