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 - 2020, 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 } 262