xref: /openbmc/linux/drivers/acpi/acpica/exstoren.c (revision 612c2932)
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 - 2023, 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
acpi_ex_resolve_object(union acpi_operand_object ** source_desc_ptr,acpi_object_type target_type,struct acpi_walk_state * walk_state)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
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)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 }
262