1
2 /******************************************************************************
3 *
4 * Module Name: exstoren - AML Interpreter object store support,
5 * Store to Node (namespace object)
6 *
7 *****************************************************************************/
8
9 /*
10 * Copyright (C) 2000 - 2004, R. Byron Moore
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions, and the following disclaimer,
18 * without modification.
19 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
20 * substantially similar to the "NO WARRANTY" disclaimer below
21 * ("Disclaimer") and any redistribution must be conditioned upon
22 * including a substantially similar Disclaimer requirement for further
23 * binary redistribution.
24 * 3. Neither the names of the above-listed copyright holders nor the names
25 * of any contributors may be used to endorse or promote products derived
26 * from this software without specific prior written permission.
27 *
28 * Alternatively, this software may be distributed under the terms of the
29 * GNU General Public License ("GPL") version 2 as published by the Free
30 * Software Foundation.
31 *
32 * NO WARRANTY
33 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
34 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
35 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
36 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
37 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
38 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
39 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
42 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
43 * POSSIBILITY OF SUCH DAMAGES.
44 */
45
46
47 #include <acpi/acpi.h>
48 #include <acpi/acinterp.h>
49 #include <acpi/amlcode.h>
50
51
52 #define _COMPONENT ACPI_EXECUTER
53 ACPI_MODULE_NAME ("exstoren")
54
55
56 /*******************************************************************************
57 *
58 * FUNCTION: acpi_ex_resolve_object
59 *
60 * PARAMETERS: source_desc_ptr - Pointer to the source object
61 * target_type - Current type of the target
62 * walk_state - Current walk state
63 *
64 * RETURN: Status, resolved object in source_desc_ptr.
65 *
66 * DESCRIPTION: Resolve an object. If the object is a reference, dereference
67 * it and return the actual object in the source_desc_ptr.
68 *
69 ******************************************************************************/
70
71 acpi_status
acpi_ex_resolve_object(union acpi_operand_object ** source_desc_ptr,acpi_object_type target_type,struct acpi_walk_state * walk_state)72 acpi_ex_resolve_object (
73 union acpi_operand_object **source_desc_ptr,
74 acpi_object_type target_type,
75 struct acpi_walk_state *walk_state)
76 {
77 union acpi_operand_object *source_desc = *source_desc_ptr;
78 acpi_status status = AE_OK;
79
80
81 ACPI_FUNCTION_TRACE ("ex_resolve_object");
82
83
84 /*
85 * Ensure we have a Target that can be stored to
86 */
87 switch (target_type) {
88 case ACPI_TYPE_BUFFER_FIELD:
89 case ACPI_TYPE_LOCAL_REGION_FIELD:
90 case ACPI_TYPE_LOCAL_BANK_FIELD:
91 case ACPI_TYPE_LOCAL_INDEX_FIELD:
92 /*
93 * These cases all require only Integers or values that
94 * can be converted to Integers (Strings or Buffers)
95 */
96
97 case ACPI_TYPE_INTEGER:
98 case ACPI_TYPE_STRING:
99 case ACPI_TYPE_BUFFER:
100
101 /*
102 * Stores into a Field/Region or into a Integer/Buffer/String
103 * are all essentially the same. This case handles the
104 * "interchangeable" types Integer, String, and Buffer.
105 */
106 if (ACPI_GET_OBJECT_TYPE (source_desc) == ACPI_TYPE_LOCAL_REFERENCE) {
107 /* Resolve a reference object first */
108
109 status = acpi_ex_resolve_to_value (source_desc_ptr, walk_state);
110 if (ACPI_FAILURE (status)) {
111 break;
112 }
113 }
114
115 /* For copy_object, no further validation necessary */
116
117 if (walk_state->opcode == AML_COPY_OP) {
118 break;
119 }
120
121 /*
122 * Must have a Integer, Buffer, or String
123 */
124 if ((ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_INTEGER) &&
125 (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_BUFFER) &&
126 (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_STRING) &&
127 !((ACPI_GET_OBJECT_TYPE (source_desc) == ACPI_TYPE_LOCAL_REFERENCE) && (source_desc->reference.opcode == AML_LOAD_OP))) {
128 /*
129 * Conversion successful but still not a valid type
130 */
131 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
132 "Cannot assign type %s to %s (must be type Int/Str/Buf)\n",
133 acpi_ut_get_object_type_name (source_desc),
134 acpi_ut_get_type_name (target_type)));
135 status = AE_AML_OPERAND_TYPE;
136 }
137 break;
138
139
140 case ACPI_TYPE_LOCAL_ALIAS:
141 case ACPI_TYPE_LOCAL_METHOD_ALIAS:
142
143 /*
144 * Aliases are resolved by acpi_ex_prep_operands
145 */
146 ACPI_REPORT_ERROR (("Store into Alias - should never happen\n"));
147 status = AE_AML_INTERNAL;
148 break;
149
150
151 case ACPI_TYPE_PACKAGE:
152 default:
153
154 /*
155 * All other types than Alias and the various Fields come here,
156 * including the untyped case - ACPI_TYPE_ANY.
157 */
158 break;
159 }
160
161 return_ACPI_STATUS (status);
162 }
163
164
165 /*******************************************************************************
166 *
167 * FUNCTION: acpi_ex_store_object_to_object
168 *
169 * PARAMETERS: source_desc - Object to store
170 * dest_desc - Object to receive a copy of the source
171 * new_desc - New object if dest_desc is obsoleted
172 * walk_state - Current walk state
173 *
174 * RETURN: Status
175 *
176 * DESCRIPTION: "Store" an object to another object. This may include
177 * converting the source type to the target type (implicit
178 * conversion), and a copy of the value of the source to
179 * the target.
180 *
181 * The Assignment of an object to another (not named) object
182 * is handled here.
183 * The Source passed in will replace the current value (if any)
184 * with the input value.
185 *
186 * When storing into an object the data is converted to the
187 * target object type then stored in the object. This means
188 * that the target object type (for an initialized target) will
189 * not be changed by a store operation.
190 *
191 * This module allows destination types of Number, String,
192 * Buffer, and Package.
193 *
194 * Assumes parameters are already validated. NOTE: source_desc
195 * resolution (from a reference object) must be performed by
196 * the caller if necessary.
197 *
198 ******************************************************************************/
199
200 acpi_status
acpi_ex_store_object_to_object(union acpi_operand_object * source_desc,union acpi_operand_object * dest_desc,union acpi_operand_object ** new_desc,struct acpi_walk_state * walk_state)201 acpi_ex_store_object_to_object (
202 union acpi_operand_object *source_desc,
203 union acpi_operand_object *dest_desc,
204 union acpi_operand_object **new_desc,
205 struct acpi_walk_state *walk_state)
206 {
207 union acpi_operand_object *actual_src_desc;
208 acpi_status status = AE_OK;
209
210
211 ACPI_FUNCTION_TRACE_PTR ("ex_store_object_to_object", source_desc);
212
213
214 actual_src_desc = source_desc;
215 if (!dest_desc) {
216 /*
217 * There is no destination object (An uninitialized node or
218 * package element), so we can simply copy the source object
219 * creating a new destination object
220 */
221 status = acpi_ut_copy_iobject_to_iobject (actual_src_desc, new_desc, walk_state);
222 return_ACPI_STATUS (status);
223 }
224
225 if (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_GET_OBJECT_TYPE (dest_desc)) {
226 /*
227 * The source type does not match the type of the destination.
228 * Perform the "implicit conversion" of the source to the current type
229 * of the target as per the ACPI specification.
230 *
231 * If no conversion performed, actual_src_desc = source_desc.
232 * Otherwise, actual_src_desc is a temporary object to hold the
233 * converted object.
234 */
235 status = acpi_ex_convert_to_target_type (ACPI_GET_OBJECT_TYPE (dest_desc), source_desc,
236 &actual_src_desc, walk_state);
237 if (ACPI_FAILURE (status)) {
238 return_ACPI_STATUS (status);
239 }
240
241 if (source_desc == actual_src_desc) {
242 /*
243 * No conversion was performed. Return the source_desc as the
244 * new object.
245 */
246 *new_desc = source_desc;
247 return_ACPI_STATUS (AE_OK);
248 }
249 }
250
251 /*
252 * We now have two objects of identical types, and we can perform a
253 * copy of the *value* of the source object.
254 */
255 switch (ACPI_GET_OBJECT_TYPE (dest_desc)) {
256 case ACPI_TYPE_INTEGER:
257
258 dest_desc->integer.value = actual_src_desc->integer.value;
259
260 /* Truncate value if we are executing from a 32-bit ACPI table */
261
262 acpi_ex_truncate_for32bit_table (dest_desc);
263 break;
264
265 case ACPI_TYPE_STRING:
266
267 status = acpi_ex_store_string_to_string (actual_src_desc, dest_desc);
268 break;
269
270 case ACPI_TYPE_BUFFER:
271
272 status = acpi_ex_store_buffer_to_buffer (actual_src_desc, dest_desc);
273 break;
274
275 case ACPI_TYPE_PACKAGE:
276
277 status = acpi_ut_copy_iobject_to_iobject (actual_src_desc, &dest_desc, walk_state);
278 break;
279
280 default:
281 /*
282 * All other types come here.
283 */
284 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Store into type %s not implemented\n",
285 acpi_ut_get_object_type_name (dest_desc)));
286
287 status = AE_NOT_IMPLEMENTED;
288 break;
289 }
290
291 if (actual_src_desc != source_desc) {
292 /* Delete the intermediate (temporary) source object */
293
294 acpi_ut_remove_reference (actual_src_desc);
295 }
296
297 *new_desc = dest_desc;
298 return_ACPI_STATUS (status);
299 }
300
301
302