1 2/****************************************************************************** 3 * 4 * Module Name: exresnte - AML Interpreter object resolution 5 * 6 *****************************************************************************/ 7 8/* 9 * Copyright (C) 2000 - 2007, R. Byron Moore 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer, 17 * without modification. 18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 19 * substantially similar to the "NO WARRANTY" disclaimer below 20 * ("Disclaimer") and any redistribution must be conditioned upon 21 * including a substantially similar Disclaimer requirement for further 22 * binary redistribution. 23 * 3. Neither the names of the above-listed copyright holders nor the names 24 * of any contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * Alternatively, this software may be distributed under the terms of the 28 * GNU General Public License ("GPL") version 2 as published by the Free 29 * Software Foundation. 30 * 31 * NO WARRANTY 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42 * POSSIBILITY OF SUCH DAMAGES. 43 */ 44 45#include <acpi/acpi.h> 46#include <acpi/acdispat.h> 47#include <acpi/acinterp.h> 48#include <acpi/acnamesp.h> 49#include <acpi/acparser.h> 50#include <acpi/amlcode.h> 51 52#define _COMPONENT ACPI_EXECUTER 53ACPI_MODULE_NAME("exresnte") 54 55/******************************************************************************* 56 * 57 * FUNCTION: acpi_ex_resolve_node_to_value 58 * 59 * PARAMETERS: object_ptr - Pointer to a location that contains 60 * a pointer to a NS node, and will receive a 61 * pointer to the resolved object. 62 * walk_state - Current state. Valid only if executing AML 63 * code. NULL if simply resolving an object 64 * 65 * RETURN: Status 66 * 67 * DESCRIPTION: Resolve a Namespace node to a valued object 68 * 69 * Note: for some of the data types, the pointer attached to the Node 70 * can be either a pointer to an actual internal object or a pointer into the 71 * AML stream itself. These types are currently: 72 * 73 * ACPI_TYPE_INTEGER 74 * ACPI_TYPE_STRING 75 * ACPI_TYPE_BUFFER 76 * ACPI_TYPE_MUTEX 77 * ACPI_TYPE_PACKAGE 78 * 79 ******************************************************************************/ 80acpi_status 81acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr, 82 struct acpi_walk_state *walk_state) 83{ 84 acpi_status status = AE_OK; 85 union acpi_operand_object *source_desc; 86 union acpi_operand_object *obj_desc = NULL; 87 struct acpi_namespace_node *node; 88 acpi_object_type entry_type; 89 90 ACPI_FUNCTION_TRACE(ex_resolve_node_to_value); 91 92 /* 93 * The stack pointer points to a struct acpi_namespace_node (Node). Get the 94 * object that is attached to the Node. 95 */ 96 node = *object_ptr; 97 source_desc = acpi_ns_get_attached_object(node); 98 entry_type = acpi_ns_get_type((acpi_handle) node); 99 100 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n", 101 node, source_desc, 102 acpi_ut_get_type_name(entry_type))); 103 104 if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) || 105 (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) { 106 107 /* There is always exactly one level of indirection */ 108 109 node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object); 110 source_desc = acpi_ns_get_attached_object(node); 111 entry_type = acpi_ns_get_type((acpi_handle) node); 112 *object_ptr = node; 113 } 114 115 /* 116 * Several object types require no further processing: 117 * 1) Device/Thermal objects don't have a "real" subobject, return the Node 118 * 2) Method locals and arguments have a pseudo-Node 119 */ 120 if ((entry_type == ACPI_TYPE_DEVICE) || 121 (entry_type == ACPI_TYPE_THERMAL) || 122 (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) { 123 return_ACPI_STATUS(AE_OK); 124 } 125 126 if (!source_desc) { 127 ACPI_ERROR((AE_INFO, "No object attached to node %p", node)); 128 return_ACPI_STATUS(AE_AML_NO_OPERAND); 129 } 130 131 /* 132 * Action is based on the type of the Node, which indicates the type 133 * of the attached object or pointer 134 */ 135 switch (entry_type) { 136 case ACPI_TYPE_PACKAGE: 137 138 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_PACKAGE) { 139 ACPI_ERROR((AE_INFO, "Object not a Package, type %s", 140 acpi_ut_get_object_type_name(source_desc))); 141 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 142 } 143 144 status = acpi_ds_get_package_arguments(source_desc); 145 if (ACPI_SUCCESS(status)) { 146 147 /* Return an additional reference to the object */ 148 149 obj_desc = source_desc; 150 acpi_ut_add_reference(obj_desc); 151 } 152 break; 153 154 case ACPI_TYPE_BUFFER: 155 156 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_BUFFER) { 157 ACPI_ERROR((AE_INFO, "Object not a Buffer, type %s", 158 acpi_ut_get_object_type_name(source_desc))); 159 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 160 } 161 162 status = acpi_ds_get_buffer_arguments(source_desc); 163 if (ACPI_SUCCESS(status)) { 164 165 /* Return an additional reference to the object */ 166 167 obj_desc = source_desc; 168 acpi_ut_add_reference(obj_desc); 169 } 170 break; 171 172 case ACPI_TYPE_STRING: 173 174 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_STRING) { 175 ACPI_ERROR((AE_INFO, "Object not a String, type %s", 176 acpi_ut_get_object_type_name(source_desc))); 177 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 178 } 179 180 /* Return an additional reference to the object */ 181 182 obj_desc = source_desc; 183 acpi_ut_add_reference(obj_desc); 184 break; 185 186 case ACPI_TYPE_INTEGER: 187 188 if (ACPI_GET_OBJECT_TYPE(source_desc) != ACPI_TYPE_INTEGER) { 189 ACPI_ERROR((AE_INFO, "Object not a Integer, type %s", 190 acpi_ut_get_object_type_name(source_desc))); 191 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 192 } 193 194 /* Return an additional reference to the object */ 195 196 obj_desc = source_desc; 197 acpi_ut_add_reference(obj_desc); 198 break; 199 200 case ACPI_TYPE_BUFFER_FIELD: 201 case ACPI_TYPE_LOCAL_REGION_FIELD: 202 case ACPI_TYPE_LOCAL_BANK_FIELD: 203 case ACPI_TYPE_LOCAL_INDEX_FIELD: 204 205 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 206 "FieldRead Node=%p SourceDesc=%p Type=%X\n", 207 node, source_desc, entry_type)); 208 209 status = 210 acpi_ex_read_data_from_field(walk_state, source_desc, 211 &obj_desc); 212 break; 213 214 /* For these objects, just return the object attached to the Node */ 215 216 case ACPI_TYPE_MUTEX: 217 case ACPI_TYPE_METHOD: 218 case ACPI_TYPE_POWER: 219 case ACPI_TYPE_PROCESSOR: 220 case ACPI_TYPE_EVENT: 221 case ACPI_TYPE_REGION: 222 223 /* Return an additional reference to the object */ 224 225 obj_desc = source_desc; 226 acpi_ut_add_reference(obj_desc); 227 break; 228 229 /* TYPE_ANY is untyped, and thus there is no object associated with it */ 230 231 case ACPI_TYPE_ANY: 232 233 ACPI_ERROR((AE_INFO, 234 "Untyped entry %p, no attached object!", node)); 235 236 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); /* Cannot be AE_TYPE */ 237 238 case ACPI_TYPE_LOCAL_REFERENCE: 239 240 switch (source_desc->reference.opcode) { 241 case AML_LOAD_OP: 242 243 /* This is a ddb_handle */ 244 /* Return an additional reference to the object */ 245 246 case AML_REF_OF_OP: 247 248 obj_desc = source_desc; 249 acpi_ut_add_reference(obj_desc); 250 break; 251 252 default: 253 /* No named references are allowed here */ 254 255 ACPI_ERROR((AE_INFO, 256 "Unsupported Reference opcode %X (%s)", 257 source_desc->reference.opcode, 258 acpi_ps_get_opcode_name(source_desc-> 259 reference.opcode))); 260 261 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 262 } 263 break; 264 265 default: 266 267 /* Default case is for unknown types */ 268 269 ACPI_ERROR((AE_INFO, 270 "Node %p - Unknown object type %X", 271 node, entry_type)); 272 273 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 274 275 } /* switch (entry_type) */ 276 277 /* Return the object descriptor */ 278 279 *object_ptr = (void *)obj_desc; 280 return_ACPI_STATUS(status); 281} 282