1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: exresnte - AML Interpreter object resolution
5 *
6 * Copyright (C) 2000 - 2019, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acdispat.h"
13 #include "acinterp.h"
14 #include "acnamesp.h"
15
16 #define _COMPONENT ACPI_EXECUTER
17 ACPI_MODULE_NAME("exresnte")
18
19 /*******************************************************************************
20 *
21 * FUNCTION: acpi_ex_resolve_node_to_value
22 *
23 * PARAMETERS: object_ptr - Pointer to a location that contains
24 * a pointer to a NS node, and will receive a
25 * pointer to the resolved object.
26 * walk_state - Current state. Valid only if executing AML
27 * code. NULL if simply resolving an object
28 *
29 * RETURN: Status
30 *
31 * DESCRIPTION: Resolve a Namespace node to a valued object
32 *
33 * Note: for some of the data types, the pointer attached to the Node
34 * can be either a pointer to an actual internal object or a pointer into the
35 * AML stream itself. These types are currently:
36 *
37 * ACPI_TYPE_INTEGER
38 * ACPI_TYPE_STRING
39 * ACPI_TYPE_BUFFER
40 * ACPI_TYPE_MUTEX
41 * ACPI_TYPE_PACKAGE
42 *
43 ******************************************************************************/
44 acpi_status
45 acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr,
46 struct acpi_walk_state *walk_state)
47 {
48 acpi_status status = AE_OK;
49 union acpi_operand_object *source_desc;
50 union acpi_operand_object *obj_desc = NULL;
51 struct acpi_namespace_node *node;
52 acpi_object_type entry_type;
53
54 ACPI_FUNCTION_TRACE(ex_resolve_node_to_value);
55
56 /*
57 * The stack pointer points to a struct acpi_namespace_node (Node). Get the
58 * object that is attached to the Node.
59 */
60 node = *object_ptr;
61 source_desc = acpi_ns_get_attached_object(node);
62 entry_type = acpi_ns_get_type((acpi_handle)node);
63
64 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
65 node, source_desc,
66 acpi_ut_get_type_name(entry_type)));
67
68 if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) ||
69 (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) {
70
71 /* There is always exactly one level of indirection */
72
73 node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object);
74 source_desc = acpi_ns_get_attached_object(node);
75 entry_type = acpi_ns_get_type((acpi_handle)node);
76 *object_ptr = node;
77 }
78
79 /*
80 * Several object types require no further processing:
81 * 1) Device/Thermal objects don't have a "real" subobject, return Node
82 * 2) Method locals and arguments have a pseudo-Node
83 * 3) 10/2007: Added method type to assist with Package construction.
84 */
85 if ((entry_type == ACPI_TYPE_DEVICE) ||
86 (entry_type == ACPI_TYPE_THERMAL) ||
87 (entry_type == ACPI_TYPE_METHOD) ||
88 (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) {
89 return_ACPI_STATUS(AE_OK);
90 }
91
92 if (!source_desc) {
93 ACPI_ERROR((AE_INFO, "No object attached to node [%4.4s] %p",
94 node->name.ascii, node));
95 return_ACPI_STATUS(AE_AML_UNINITIALIZED_NODE);
96 }
97
98 /*
99 * Action is based on the type of the Node, which indicates the type
100 * of the attached object or pointer
101 */
102 switch (entry_type) {
103 case ACPI_TYPE_PACKAGE:
104
105 if (source_desc->common.type != ACPI_TYPE_PACKAGE) {
106 ACPI_ERROR((AE_INFO, "Object not a Package, type %s",
107 acpi_ut_get_object_type_name(source_desc)));
108 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
109 }
110
111 status = acpi_ds_get_package_arguments(source_desc);
112 if (ACPI_SUCCESS(status)) {
113
114 /* Return an additional reference to the object */
115
116 obj_desc = source_desc;
117 acpi_ut_add_reference(obj_desc);
118 }
119 break;
120
121 case ACPI_TYPE_BUFFER:
122
123 if (source_desc->common.type != ACPI_TYPE_BUFFER) {
124 ACPI_ERROR((AE_INFO, "Object not a Buffer, type %s",
125 acpi_ut_get_object_type_name(source_desc)));
126 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
127 }
128
129 status = acpi_ds_get_buffer_arguments(source_desc);
130 if (ACPI_SUCCESS(status)) {
131
132 /* Return an additional reference to the object */
133
134 obj_desc = source_desc;
135 acpi_ut_add_reference(obj_desc);
136 }
137 break;
138
139 case ACPI_TYPE_STRING:
140
141 if (source_desc->common.type != ACPI_TYPE_STRING) {
142 ACPI_ERROR((AE_INFO, "Object not a String, type %s",
143 acpi_ut_get_object_type_name(source_desc)));
144 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
145 }
146
147 /* Return an additional reference to the object */
148
149 obj_desc = source_desc;
150 acpi_ut_add_reference(obj_desc);
151 break;
152
153 case ACPI_TYPE_INTEGER:
154
155 if (source_desc->common.type != ACPI_TYPE_INTEGER) {
156 ACPI_ERROR((AE_INFO, "Object not a Integer, type %s",
157 acpi_ut_get_object_type_name(source_desc)));
158 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
159 }
160
161 /* Return an additional reference to the object */
162
163 obj_desc = source_desc;
164 acpi_ut_add_reference(obj_desc);
165 break;
166
167 case ACPI_TYPE_BUFFER_FIELD:
168 case ACPI_TYPE_LOCAL_REGION_FIELD:
169 case ACPI_TYPE_LOCAL_BANK_FIELD:
170 case ACPI_TYPE_LOCAL_INDEX_FIELD:
171
172 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
173 "FieldRead Node=%p SourceDesc=%p Type=%X\n",
174 node, source_desc, entry_type));
175
176 status =
177 acpi_ex_read_data_from_field(walk_state, source_desc,
178 &obj_desc);
179 break;
180
181 /* For these objects, just return the object attached to the Node */
182
183 case ACPI_TYPE_MUTEX:
184 case ACPI_TYPE_POWER:
185 case ACPI_TYPE_PROCESSOR:
186 case ACPI_TYPE_EVENT:
187 case ACPI_TYPE_REGION:
188
189 /* Return an additional reference to the object */
190
191 obj_desc = source_desc;
192 acpi_ut_add_reference(obj_desc);
193 break;
194
195 /* TYPE_ANY is untyped, and thus there is no object associated with it */
196
197 case ACPI_TYPE_ANY:
198
199 ACPI_ERROR((AE_INFO,
200 "Untyped entry %p, no attached object!", node));
201
202 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); /* Cannot be AE_TYPE */
203
204 case ACPI_TYPE_LOCAL_REFERENCE:
205
206 switch (source_desc->reference.class) {
207 case ACPI_REFCLASS_TABLE: /* This is a ddb_handle */
208 case ACPI_REFCLASS_REFOF:
209 case ACPI_REFCLASS_INDEX:
210
211 /* Return an additional reference to the object */
212
213 obj_desc = source_desc;
214 acpi_ut_add_reference(obj_desc);
215 break;
216
217 default:
218
219 /* No named references are allowed here */
220
221 ACPI_ERROR((AE_INFO,
222 "Unsupported Reference type 0x%X",
223 source_desc->reference.class));
224
225 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
226 }
227 break;
228
229 default:
230
231 /* Default case is for unknown types */
232
233 ACPI_ERROR((AE_INFO,
234 "Node %p - Unknown object type 0x%X",
235 node, entry_type));
236
237 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
238
239 } /* switch (entry_type) */
240
241 /* Return the object descriptor */
242
243 *object_ptr = (void *)obj_desc;
244 return_ACPI_STATUS(status);
245 }