1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: exstoren - AML Interpreter object store support,
5 * Store to Node (namespace object)
6 *
7 * Copyright (C) 2000 - 2019, Intel Corp.
8 *
9 *****************************************************************************/
10
11 #include <acpi/acpi.h>
12 #include "accommon.h"
13 #include "acinterp.h"
14 #include "amlcode.h"
15
16 #define _COMPONENT ACPI_EXECUTER
17 ACPI_MODULE_NAME("exstoren")
18
19 /*******************************************************************************
20 *
21 * FUNCTION: acpi_ex_resolve_object
22 *
23 * PARAMETERS: source_desc_ptr - Pointer to the source object
24 * target_type - Current type of the target
25 * walk_state - Current walk state
26 *
27 * RETURN: Status, resolved object in source_desc_ptr.
28 *
29 * DESCRIPTION: Resolve an object. If the object is a reference, dereference
30 * it and return the actual object in the source_desc_ptr.
31 *
32 ******************************************************************************/
33 acpi_status
34 acpi_ex_resolve_object(union acpi_operand_object **source_desc_ptr,
35 acpi_object_type target_type,
36 struct acpi_walk_state *walk_state)
37 {
38 union acpi_operand_object *source_desc = *source_desc_ptr;
39 acpi_status status = AE_OK;
40
41 ACPI_FUNCTION_TRACE(ex_resolve_object);
42
43 /* Ensure we have a Target that can be stored to */
44
45 switch (target_type) {
46 case ACPI_TYPE_BUFFER_FIELD:
47 case ACPI_TYPE_LOCAL_REGION_FIELD:
48 case ACPI_TYPE_LOCAL_BANK_FIELD:
49 case ACPI_TYPE_LOCAL_INDEX_FIELD:
50 /*
51 * These cases all require only Integers or values that
52 * can be converted to Integers (Strings or Buffers)
53 */
54 case ACPI_TYPE_INTEGER:
55 case ACPI_TYPE_STRING:
56 case ACPI_TYPE_BUFFER:
57 /*
58 * Stores into a Field/Region or into a Integer/Buffer/String
59 * are all essentially the same. This case handles the
60 * "interchangeable" types Integer, String, and Buffer.
61 */
62 if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
63
64 /* Resolve a reference object first */
65
66 status =
67 acpi_ex_resolve_to_value(source_desc_ptr,
68 walk_state);
69 if (ACPI_FAILURE(status)) {
70 break;
71 }
72 }
73
74 /* For copy_object, no further validation necessary */
75
76 if (walk_state->opcode == AML_COPY_OBJECT_OP) {
77 break;
78 }
79
80 /* Must have a Integer, Buffer, or String */
81
82 if ((source_desc->common.type != ACPI_TYPE_INTEGER) &&
83 (source_desc->common.type != ACPI_TYPE_BUFFER) &&
84 (source_desc->common.type != ACPI_TYPE_STRING) &&
85 !((source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) &&
86 (source_desc->reference.class == ACPI_REFCLASS_TABLE))) {
87
88 /* Conversion successful but still not a valid type */
89
90 ACPI_ERROR((AE_INFO,
91 "Cannot assign type [%s] to [%s] (must be type Int/Str/Buf)",
92 acpi_ut_get_object_type_name(source_desc),
93 acpi_ut_get_type_name(target_type)));
94
95 status = AE_AML_OPERAND_TYPE;
96 }
97 break;
98
99 case ACPI_TYPE_LOCAL_ALIAS:
100 case ACPI_TYPE_LOCAL_METHOD_ALIAS:
101 /*
102 * All aliases should have been resolved earlier, during the
103 * operand resolution phase.
104 */
105 ACPI_ERROR((AE_INFO, "Store into an unresolved Alias object"));
106 status = AE_AML_INTERNAL;
107 break;
108
109 case ACPI_TYPE_PACKAGE:
110 default:
111 /*
112 * All other types than Alias and the various Fields come here,
113 * including the untyped case - ACPI_TYPE_ANY.
114 */
115 break;
116 }
117
118 return_ACPI_STATUS(status);
119 }
120
121 /*******************************************************************************
122 *
123 * FUNCTION: acpi_ex_store_object_to_object
124 *
125 * PARAMETERS: source_desc - Object to store
126 * dest_desc - Object to receive a copy of the source
127 * new_desc - New object if dest_desc is obsoleted
128 * walk_state - Current walk state
129 *
130 * RETURN: Status
131 *
132 * DESCRIPTION: "Store" an object to another object. This may include
133 * converting the source type to the target type (implicit
134 * conversion), and a copy of the value of the source to
135 * the target.
136 *
137 * The Assignment of an object to another (not named) object
138 * is handled here.
139 * The Source passed in will replace the current value (if any)
140 * with the input value.
141 *
142 * When storing into an object the data is converted to the
143 * target object type then stored in the object. This means
144 * that the target object type (for an initialized target) will
145 * not be changed by a store operation.
146 *
147 * This module allows destination types of Number, String,
148 * Buffer, and Package.
149 *
150 * Assumes parameters are already validated. NOTE: source_desc
151 * resolution (from a reference object) must be performed by
152 * the caller if necessary.
153 *
154 ******************************************************************************/
155
156 acpi_status
157 acpi_ex_store_object_to_object(union acpi_operand_object *source_desc,
158 union acpi_operand_object *dest_desc,
159 union acpi_operand_object **new_desc,
160 struct acpi_walk_state *walk_state)
161 {
162 union acpi_operand_object *actual_src_desc;
163 acpi_status status = AE_OK;
164
165 ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_object, source_desc);
166
167 actual_src_desc = source_desc;
168 if (!dest_desc) {
169 /*
170 * There is no destination object (An uninitialized node or
171 * package element), so we can simply copy the source object
172 * creating a new destination object
173 */
174 status =
175 acpi_ut_copy_iobject_to_iobject(actual_src_desc, new_desc,
176 walk_state);
177 return_ACPI_STATUS(status);
178 }
179
180 if (source_desc->common.type != dest_desc->common.type) {
181 /*
182 * The source type does not match the type of the destination.
183 * Perform the "implicit conversion" of the source to the current type
184 * of the target as per the ACPI specification.
185 *
186 * If no conversion performed, actual_src_desc = source_desc.
187 * Otherwise, actual_src_desc is a temporary object to hold the
188 * converted object.
189 */
190 status = acpi_ex_convert_to_target_type(dest_desc->common.type,
191 source_desc,
192 &actual_src_desc,
193 walk_state);
194 if (ACPI_FAILURE(status)) {
195 return_ACPI_STATUS(status);
196 }
197
198 if (source_desc == actual_src_desc) {
199 /*
200 * No conversion was performed. Return the source_desc as the
201 * new object.
202 */
203 *new_desc = source_desc;
204 return_ACPI_STATUS(AE_OK);
205 }
206 }
207
208 /*
209 * We now have two objects of identical types, and we can perform a
210 * copy of the *value* of the source object.
211 */
212 switch (dest_desc->common.type) {
213 case ACPI_TYPE_INTEGER:
214
215 dest_desc->integer.value = actual_src_desc->integer.value;
216
217 /* Truncate value if we are executing from a 32-bit ACPI table */
218
219 (void)acpi_ex_truncate_for32bit_table(dest_desc);
220 break;
221
222 case ACPI_TYPE_STRING:
223
224 status =
225 acpi_ex_store_string_to_string(actual_src_desc, dest_desc);
226 break;
227
228 case ACPI_TYPE_BUFFER:
229
230 status =
231 acpi_ex_store_buffer_to_buffer(actual_src_desc, dest_desc);
232 break;
233
234 case ACPI_TYPE_PACKAGE:
235
236 status =
237 acpi_ut_copy_iobject_to_iobject(actual_src_desc, &dest_desc,
238 walk_state);
239 break;
240
241 default:
242 /*
243 * All other types come here.
244 */
245 ACPI_WARNING((AE_INFO, "Store into type [%s] not implemented",
246 acpi_ut_get_object_type_name(dest_desc)));
247
248 status = AE_NOT_IMPLEMENTED;
249 break;
250 }
251
252 if (actual_src_desc != source_desc) {
253
254 /* Delete the intermediate (temporary) source object */
255
256 acpi_ut_remove_reference(actual_src_desc);
257 }
258
259 *new_desc = dest_desc;
260 return_ACPI_STATUS(status);
261 }