1 | /****************************************************************************** |
2 | * |
3 | * Module Name: exresnte - AML Interpreter object resolution |
4 | * |
5 | *****************************************************************************/ |
6 | |
7 | /* |
8 | * Copyright (C) 2000 - 2016, 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 | #include "acpi.h" |
45 | #include "accommon.h" |
46 | #include "acdispat.h" |
47 | #include "acinterp.h" |
48 | #include "acnamesp.h" |
49 | |
50 | |
51 | #define _COMPONENT ACPI_EXECUTER |
52 | ACPI_MODULE_NAME ("exresnte" ) |
53 | |
54 | |
55 | /******************************************************************************* |
56 | * |
57 | * FUNCTION: AcpiExResolveNodeToValue |
58 | * |
59 | * PARAMETERS: ObjectPtr - Pointer to a location that contains |
60 | * a pointer to a NS node, and will receive a |
61 | * pointer to the resolved object. |
62 | * WalkState - Current state. Valid only if executing AML |
63 | * code. NULL if simply resolving an object |
64 | * |
65 | * RETURN: Status |
66 | * |
67 | * DESCRIPTION: Resolve a Namespace node to a valued object |
68 | * |
69 | * Note: for some of the data types, the pointer attached to the Node |
70 | * can be either a pointer to an actual internal object or a pointer into the |
71 | * AML stream itself. These types are currently: |
72 | * |
73 | * ACPI_TYPE_INTEGER |
74 | * ACPI_TYPE_STRING |
75 | * ACPI_TYPE_BUFFER |
76 | * ACPI_TYPE_MUTEX |
77 | * ACPI_TYPE_PACKAGE |
78 | * |
79 | ******************************************************************************/ |
80 | |
81 | ACPI_STATUS |
82 | AcpiExResolveNodeToValue ( |
83 | ACPI_NAMESPACE_NODE **ObjectPtr, |
84 | ACPI_WALK_STATE *WalkState) |
85 | |
86 | { |
87 | ACPI_STATUS Status = AE_OK; |
88 | ACPI_OPERAND_OBJECT *SourceDesc; |
89 | ACPI_OPERAND_OBJECT *ObjDesc = NULL; |
90 | ACPI_NAMESPACE_NODE *Node; |
91 | ACPI_OBJECT_TYPE EntryType; |
92 | |
93 | |
94 | ACPI_FUNCTION_TRACE (ExResolveNodeToValue); |
95 | |
96 | |
97 | /* |
98 | * The stack pointer points to a ACPI_NAMESPACE_NODE (Node). Get the |
99 | * object that is attached to the Node. |
100 | */ |
101 | Node = *ObjectPtr; |
102 | SourceDesc = AcpiNsGetAttachedObject (Node); |
103 | EntryType = AcpiNsGetType ((ACPI_HANDLE) Node); |
104 | |
105 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n" , |
106 | Node, SourceDesc, AcpiUtGetTypeName (EntryType))); |
107 | |
108 | if ((EntryType == ACPI_TYPE_LOCAL_ALIAS) || |
109 | (EntryType == ACPI_TYPE_LOCAL_METHOD_ALIAS)) |
110 | { |
111 | /* There is always exactly one level of indirection */ |
112 | |
113 | Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object); |
114 | SourceDesc = AcpiNsGetAttachedObject (Node); |
115 | EntryType = AcpiNsGetType ((ACPI_HANDLE) Node); |
116 | *ObjectPtr = Node; |
117 | } |
118 | |
119 | /* |
120 | * Several object types require no further processing: |
121 | * 1) Device/Thermal objects don't have a "real" subobject, return Node |
122 | * 2) Method locals and arguments have a pseudo-Node |
123 | * 3) 10/2007: Added method type to assist with Package construction. |
124 | */ |
125 | if ((EntryType == ACPI_TYPE_DEVICE) || |
126 | (EntryType == ACPI_TYPE_THERMAL) || |
127 | (EntryType == ACPI_TYPE_METHOD) || |
128 | (Node->Flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) |
129 | { |
130 | return_ACPI_STATUS (AE_OK); |
131 | } |
132 | |
133 | if (!SourceDesc) |
134 | { |
135 | ACPI_ERROR ((AE_INFO, "No object attached to node [%4.4s] %p" , |
136 | Node->Name.Ascii, Node)); |
137 | return_ACPI_STATUS (AE_AML_UNINITIALIZED_NODE); |
138 | } |
139 | |
140 | /* |
141 | * Action is based on the type of the Node, which indicates the type |
142 | * of the attached object or pointer |
143 | */ |
144 | switch (EntryType) |
145 | { |
146 | case ACPI_TYPE_PACKAGE: |
147 | |
148 | if (SourceDesc->Common.Type != ACPI_TYPE_PACKAGE) |
149 | { |
150 | ACPI_ERROR ((AE_INFO, "Object not a Package, type %s" , |
151 | AcpiUtGetObjectTypeName (SourceDesc))); |
152 | return_ACPI_STATUS (AE_AML_OPERAND_TYPE); |
153 | } |
154 | |
155 | Status = AcpiDsGetPackageArguments (SourceDesc); |
156 | if (ACPI_SUCCESS (Status)) |
157 | { |
158 | /* Return an additional reference to the object */ |
159 | |
160 | ObjDesc = SourceDesc; |
161 | AcpiUtAddReference (ObjDesc); |
162 | } |
163 | break; |
164 | |
165 | case ACPI_TYPE_BUFFER: |
166 | |
167 | if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER) |
168 | { |
169 | ACPI_ERROR ((AE_INFO, "Object not a Buffer, type %s" , |
170 | AcpiUtGetObjectTypeName (SourceDesc))); |
171 | return_ACPI_STATUS (AE_AML_OPERAND_TYPE); |
172 | } |
173 | |
174 | Status = AcpiDsGetBufferArguments (SourceDesc); |
175 | if (ACPI_SUCCESS (Status)) |
176 | { |
177 | /* Return an additional reference to the object */ |
178 | |
179 | ObjDesc = SourceDesc; |
180 | AcpiUtAddReference (ObjDesc); |
181 | } |
182 | break; |
183 | |
184 | case ACPI_TYPE_STRING: |
185 | |
186 | if (SourceDesc->Common.Type != ACPI_TYPE_STRING) |
187 | { |
188 | ACPI_ERROR ((AE_INFO, "Object not a String, type %s" , |
189 | AcpiUtGetObjectTypeName (SourceDesc))); |
190 | return_ACPI_STATUS (AE_AML_OPERAND_TYPE); |
191 | } |
192 | |
193 | /* Return an additional reference to the object */ |
194 | |
195 | ObjDesc = SourceDesc; |
196 | AcpiUtAddReference (ObjDesc); |
197 | break; |
198 | |
199 | case ACPI_TYPE_INTEGER: |
200 | |
201 | if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER) |
202 | { |
203 | ACPI_ERROR ((AE_INFO, "Object not a Integer, type %s" , |
204 | AcpiUtGetObjectTypeName (SourceDesc))); |
205 | return_ACPI_STATUS (AE_AML_OPERAND_TYPE); |
206 | } |
207 | |
208 | /* Return an additional reference to the object */ |
209 | |
210 | ObjDesc = SourceDesc; |
211 | AcpiUtAddReference (ObjDesc); |
212 | break; |
213 | |
214 | case ACPI_TYPE_BUFFER_FIELD: |
215 | case ACPI_TYPE_LOCAL_REGION_FIELD: |
216 | case ACPI_TYPE_LOCAL_BANK_FIELD: |
217 | case ACPI_TYPE_LOCAL_INDEX_FIELD: |
218 | |
219 | ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, |
220 | "FieldRead Node=%p SourceDesc=%p Type=%X\n" , |
221 | Node, SourceDesc, EntryType)); |
222 | |
223 | Status = AcpiExReadDataFromField (WalkState, SourceDesc, &ObjDesc); |
224 | break; |
225 | |
226 | /* For these objects, just return the object attached to the Node */ |
227 | |
228 | case ACPI_TYPE_MUTEX: |
229 | case ACPI_TYPE_POWER: |
230 | case ACPI_TYPE_PROCESSOR: |
231 | case ACPI_TYPE_EVENT: |
232 | case ACPI_TYPE_REGION: |
233 | |
234 | /* Return an additional reference to the object */ |
235 | |
236 | ObjDesc = SourceDesc; |
237 | AcpiUtAddReference (ObjDesc); |
238 | break; |
239 | |
240 | /* TYPE_ANY is untyped, and thus there is no object associated with it */ |
241 | |
242 | case ACPI_TYPE_ANY: |
243 | |
244 | ACPI_ERROR ((AE_INFO, |
245 | "Untyped entry %p, no attached object!" , Node)); |
246 | |
247 | return_ACPI_STATUS (AE_AML_OPERAND_TYPE); /* Cannot be AE_TYPE */ |
248 | |
249 | case ACPI_TYPE_LOCAL_REFERENCE: |
250 | |
251 | switch (SourceDesc->Reference.Class) |
252 | { |
253 | case ACPI_REFCLASS_TABLE: /* This is a DdbHandle */ |
254 | case ACPI_REFCLASS_REFOF: |
255 | case ACPI_REFCLASS_INDEX: |
256 | |
257 | /* Return an additional reference to the object */ |
258 | |
259 | ObjDesc = SourceDesc; |
260 | AcpiUtAddReference (ObjDesc); |
261 | break; |
262 | |
263 | default: |
264 | |
265 | /* No named references are allowed here */ |
266 | |
267 | ACPI_ERROR ((AE_INFO, |
268 | "Unsupported Reference type 0x%X" , |
269 | SourceDesc->Reference.Class)); |
270 | |
271 | return_ACPI_STATUS (AE_AML_OPERAND_TYPE); |
272 | } |
273 | break; |
274 | |
275 | default: |
276 | |
277 | /* Default case is for unknown types */ |
278 | |
279 | ACPI_ERROR ((AE_INFO, |
280 | "Node %p - Unknown object type 0x%X" , |
281 | Node, EntryType)); |
282 | |
283 | return_ACPI_STATUS (AE_AML_OPERAND_TYPE); |
284 | |
285 | } /* switch (EntryType) */ |
286 | |
287 | |
288 | /* Return the object descriptor */ |
289 | |
290 | *ObjectPtr = (void *) ObjDesc; |
291 | return_ACPI_STATUS (Status); |
292 | } |
293 | |