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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.02/******************************************************************************3 *4 * Module Name: exresnte - AML Interpreter object resolution5 *6 * Copyright (C) 2000 - 2023, 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_EXECUTER17ACPI_MODULE_NAME("exresnte")18 19/*******************************************************************************20 *21 * FUNCTION: acpi_ex_resolve_node_to_value22 *23 * PARAMETERS: object_ptr - Pointer to a location that contains24 * a pointer to a NS node, and will receive a25 * pointer to the resolved object.26 * walk_state - Current state. Valid only if executing AML27 * code. NULL if simply resolving an object28 *29 * RETURN: Status30 *31 * DESCRIPTION: Resolve a Namespace node to a valued object32 *33 * Note: for some of the data types, the pointer attached to the Node34 * can be either a pointer to an actual internal object or a pointer into the35 * AML stream itself. These types are currently:36 *37 * ACPI_TYPE_INTEGER38 * ACPI_TYPE_STRING39 * ACPI_TYPE_BUFFER40 * ACPI_TYPE_MUTEX41 * ACPI_TYPE_PACKAGE42 *43 ******************************************************************************/44acpi_status45acpi_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 the58 * 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 Node82 * 2) Method locals and arguments have a pseudo-Node83 * 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 type100 * of the attached object or pointer101 */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}246