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1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: exresnte - AML Interpreter object resolution | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
b4e104ea | 9 | * Copyright (C) 2000 - 2011, Intel Corp. |
1da177e4 LT |
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 | ||
1da177e4 | 45 | #include <acpi/acpi.h> |
e2f7a777 LB |
46 | #include "accommon.h" |
47 | #include "acdispat.h" | |
48 | #include "acinterp.h" | |
49 | #include "acnamesp.h" | |
1da177e4 | 50 | |
1da177e4 | 51 | #define _COMPONENT ACPI_EXECUTER |
4be44fcd | 52 | ACPI_MODULE_NAME("exresnte") |
1da177e4 LT |
53 | |
54 | /******************************************************************************* | |
55 | * | |
56 | * FUNCTION: acpi_ex_resolve_node_to_value | |
57 | * | |
58 | * PARAMETERS: object_ptr - Pointer to a location that contains | |
59 | * a pointer to a NS node, and will receive a | |
60 | * pointer to the resolved object. | |
61 | * walk_state - Current state. Valid only if executing AML | |
62 | * code. NULL if simply resolving an object | |
63 | * | |
64 | * RETURN: Status | |
65 | * | |
66 | * DESCRIPTION: Resolve a Namespace node to a valued object | |
67 | * | |
68 | * Note: for some of the data types, the pointer attached to the Node | |
69 | * can be either a pointer to an actual internal object or a pointer into the | |
70 | * AML stream itself. These types are currently: | |
71 | * | |
72 | * ACPI_TYPE_INTEGER | |
73 | * ACPI_TYPE_STRING | |
74 | * ACPI_TYPE_BUFFER | |
75 | * ACPI_TYPE_MUTEX | |
76 | * ACPI_TYPE_PACKAGE | |
77 | * | |
78 | ******************************************************************************/ | |
1da177e4 | 79 | acpi_status |
4be44fcd LB |
80 | acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr, |
81 | struct acpi_walk_state *walk_state) | |
1da177e4 | 82 | { |
4be44fcd LB |
83 | acpi_status status = AE_OK; |
84 | union acpi_operand_object *source_desc; | |
85 | union acpi_operand_object *obj_desc = NULL; | |
86 | struct acpi_namespace_node *node; | |
87 | acpi_object_type entry_type; | |
1da177e4 | 88 | |
b229cf92 | 89 | ACPI_FUNCTION_TRACE(ex_resolve_node_to_value); |
1da177e4 LT |
90 | |
91 | /* | |
92 | * The stack pointer points to a struct acpi_namespace_node (Node). Get the | |
93 | * object that is attached to the Node. | |
94 | */ | |
4be44fcd LB |
95 | node = *object_ptr; |
96 | source_desc = acpi_ns_get_attached_object(node); | |
97 | entry_type = acpi_ns_get_type((acpi_handle) node); | |
1da177e4 | 98 | |
b229cf92 | 99 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n", |
4be44fcd LB |
100 | node, source_desc, |
101 | acpi_ut_get_type_name(entry_type))); | |
1da177e4 LT |
102 | |
103 | if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) || | |
4be44fcd | 104 | (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) { |
52fc0b02 | 105 | |
1da177e4 LT |
106 | /* There is always exactly one level of indirection */ |
107 | ||
4be44fcd LB |
108 | node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object); |
109 | source_desc = acpi_ns_get_attached_object(node); | |
110 | entry_type = acpi_ns_get_type((acpi_handle) node); | |
1da177e4 LT |
111 | *object_ptr = node; |
112 | } | |
113 | ||
114 | /* | |
115 | * Several object types require no further processing: | |
4c90ece2 | 116 | * 1) Device/Thermal objects don't have a "real" subobject, return the Node |
1da177e4 | 117 | * 2) Method locals and arguments have a pseudo-Node |
b160987d | 118 | * 3) 10/2007: Added method type to assist with Package construction. |
1da177e4 | 119 | */ |
4c90ece2 BM |
120 | if ((entry_type == ACPI_TYPE_DEVICE) || |
121 | (entry_type == ACPI_TYPE_THERMAL) || | |
b160987d | 122 | (entry_type == ACPI_TYPE_METHOD) || |
4be44fcd LB |
123 | (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) { |
124 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
125 | } |
126 | ||
127 | if (!source_desc) { | |
b8e4d893 | 128 | ACPI_ERROR((AE_INFO, "No object attached to node %p", node)); |
4be44fcd | 129 | return_ACPI_STATUS(AE_AML_NO_OPERAND); |
1da177e4 LT |
130 | } |
131 | ||
132 | /* | |
133 | * Action is based on the type of the Node, which indicates the type | |
134 | * of the attached object or pointer | |
135 | */ | |
136 | switch (entry_type) { | |
137 | case ACPI_TYPE_PACKAGE: | |
138 | ||
3371c19c | 139 | if (source_desc->common.type != ACPI_TYPE_PACKAGE) { |
b8e4d893 BM |
140 | ACPI_ERROR((AE_INFO, "Object not a Package, type %s", |
141 | acpi_ut_get_object_type_name(source_desc))); | |
4be44fcd | 142 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
143 | } |
144 | ||
4be44fcd LB |
145 | status = acpi_ds_get_package_arguments(source_desc); |
146 | if (ACPI_SUCCESS(status)) { | |
52fc0b02 | 147 | |
1da177e4 LT |
148 | /* Return an additional reference to the object */ |
149 | ||
150 | obj_desc = source_desc; | |
4be44fcd | 151 | acpi_ut_add_reference(obj_desc); |
1da177e4 LT |
152 | } |
153 | break; | |
154 | ||
1da177e4 LT |
155 | case ACPI_TYPE_BUFFER: |
156 | ||
3371c19c | 157 | if (source_desc->common.type != ACPI_TYPE_BUFFER) { |
b8e4d893 BM |
158 | ACPI_ERROR((AE_INFO, "Object not a Buffer, type %s", |
159 | acpi_ut_get_object_type_name(source_desc))); | |
4be44fcd | 160 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
161 | } |
162 | ||
4be44fcd LB |
163 | status = acpi_ds_get_buffer_arguments(source_desc); |
164 | if (ACPI_SUCCESS(status)) { | |
52fc0b02 | 165 | |
1da177e4 LT |
166 | /* Return an additional reference to the object */ |
167 | ||
168 | obj_desc = source_desc; | |
4be44fcd | 169 | acpi_ut_add_reference(obj_desc); |
1da177e4 LT |
170 | } |
171 | break; | |
172 | ||
1da177e4 LT |
173 | case ACPI_TYPE_STRING: |
174 | ||
3371c19c | 175 | if (source_desc->common.type != ACPI_TYPE_STRING) { |
b8e4d893 BM |
176 | ACPI_ERROR((AE_INFO, "Object not a String, type %s", |
177 | acpi_ut_get_object_type_name(source_desc))); | |
4be44fcd | 178 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
179 | } |
180 | ||
181 | /* Return an additional reference to the object */ | |
182 | ||
183 | obj_desc = source_desc; | |
4be44fcd | 184 | acpi_ut_add_reference(obj_desc); |
1da177e4 LT |
185 | break; |
186 | ||
1da177e4 LT |
187 | case ACPI_TYPE_INTEGER: |
188 | ||
3371c19c | 189 | if (source_desc->common.type != ACPI_TYPE_INTEGER) { |
b8e4d893 BM |
190 | ACPI_ERROR((AE_INFO, "Object not a Integer, type %s", |
191 | acpi_ut_get_object_type_name(source_desc))); | |
4be44fcd | 192 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
193 | } |
194 | ||
195 | /* Return an additional reference to the object */ | |
196 | ||
197 | obj_desc = source_desc; | |
4be44fcd | 198 | acpi_ut_add_reference(obj_desc); |
1da177e4 LT |
199 | break; |
200 | ||
1da177e4 LT |
201 | case ACPI_TYPE_BUFFER_FIELD: |
202 | case ACPI_TYPE_LOCAL_REGION_FIELD: | |
203 | case ACPI_TYPE_LOCAL_BANK_FIELD: | |
204 | case ACPI_TYPE_LOCAL_INDEX_FIELD: | |
205 | ||
4be44fcd | 206 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
b229cf92 | 207 | "FieldRead Node=%p SourceDesc=%p Type=%X\n", |
4be44fcd | 208 | node, source_desc, entry_type)); |
1da177e4 | 209 | |
4be44fcd LB |
210 | status = |
211 | acpi_ex_read_data_from_field(walk_state, source_desc, | |
212 | &obj_desc); | |
1da177e4 LT |
213 | break; |
214 | ||
4be44fcd | 215 | /* For these objects, just return the object attached to the Node */ |
44f6c012 | 216 | |
1da177e4 | 217 | case ACPI_TYPE_MUTEX: |
1da177e4 LT |
218 | case ACPI_TYPE_POWER: |
219 | case ACPI_TYPE_PROCESSOR: | |
1da177e4 LT |
220 | case ACPI_TYPE_EVENT: |
221 | case ACPI_TYPE_REGION: | |
222 | ||
223 | /* Return an additional reference to the object */ | |
224 | ||
225 | obj_desc = source_desc; | |
4be44fcd | 226 | acpi_ut_add_reference(obj_desc); |
1da177e4 LT |
227 | break; |
228 | ||
4be44fcd | 229 | /* TYPE_ANY is untyped, and thus there is no object associated with it */ |
1da177e4 LT |
230 | |
231 | case ACPI_TYPE_ANY: | |
232 | ||
b8e4d893 BM |
233 | ACPI_ERROR((AE_INFO, |
234 | "Untyped entry %p, no attached object!", node)); | |
1da177e4 | 235 | |
4be44fcd | 236 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); /* Cannot be AE_TYPE */ |
1da177e4 LT |
237 | |
238 | case ACPI_TYPE_LOCAL_REFERENCE: | |
239 | ||
1044f1f6 BM |
240 | switch (source_desc->reference.class) { |
241 | case ACPI_REFCLASS_TABLE: /* This is a ddb_handle */ | |
242 | case ACPI_REFCLASS_REFOF: | |
243 | case ACPI_REFCLASS_INDEX: | |
1da177e4 | 244 | |
1da177e4 LT |
245 | /* Return an additional reference to the object */ |
246 | ||
247 | obj_desc = source_desc; | |
4be44fcd | 248 | acpi_ut_add_reference(obj_desc); |
1da177e4 LT |
249 | break; |
250 | ||
251 | default: | |
252 | /* No named references are allowed here */ | |
253 | ||
b8e4d893 | 254 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 255 | "Unsupported Reference type 0x%X", |
1044f1f6 | 256 | source_desc->reference.class)); |
1da177e4 | 257 | |
4be44fcd | 258 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
259 | } |
260 | break; | |
261 | ||
1da177e4 LT |
262 | default: |
263 | ||
44f6c012 RM |
264 | /* Default case is for unknown types */ |
265 | ||
b8e4d893 | 266 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 267 | "Node %p - Unknown object type 0x%X", |
b8e4d893 | 268 | node, entry_type)); |
1da177e4 | 269 | |
4be44fcd | 270 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 | 271 | |
4be44fcd | 272 | } /* switch (entry_type) */ |
1da177e4 | 273 | |
44f6c012 | 274 | /* Return the object descriptor */ |
1da177e4 | 275 | |
4be44fcd LB |
276 | *object_ptr = (void *)obj_desc; |
277 | return_ACPI_STATUS(status); | |
1da177e4 | 278 | } |