1 2 /****************************************************************************** 3 * 4 * Module Name: exresnte - AML Interpreter object resolution 5 * 6 *****************************************************************************/ 7 8 /* 9 * Copyright (C) 2000 - 2008, Intel Corp. 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 "accommon.h" 47 #include "acdispat.h" 48 #include "acinterp.h" 49 #include "acnamesp.h" 50 51 #define _COMPONENT ACPI_EXECUTER 52 ACPI_MODULE_NAME("exresnte") 53 54 /******************************************************************************* 55 * 56 * FUNCTION: acpi_ex_resolve_node_to_value 57 * 58 * PARAMETERS: object_ptr - Pointer to a location that contains 59 * a pointer to a NS node, and will receive a 60 * pointer to the resolved object. 61 * walk_state - Current state. Valid only if executing AML 62 * code. NULL if simply resolving an object 63 * 64 * RETURN: Status 65 * 66 * DESCRIPTION: Resolve a Namespace node to a valued object 67 * 68 * Note: for some of the data types, the pointer attached to the Node 69 * can be either a pointer to an actual internal object or a pointer into the 70 * AML stream itself. These types are currently: 71 * 72 * ACPI_TYPE_INTEGER 73 * ACPI_TYPE_STRING 74 * ACPI_TYPE_BUFFER 75 * ACPI_TYPE_MUTEX 76 * ACPI_TYPE_PACKAGE 77 * 78 ******************************************************************************/ 79 acpi_status 80 acpi_ex_resolve_node_to_value(struct acpi_namespace_node **object_ptr, 81 struct acpi_walk_state *walk_state) 82 { 83 acpi_status status = AE_OK; 84 union acpi_operand_object *source_desc; 85 union acpi_operand_object *obj_desc = NULL; 86 struct acpi_namespace_node *node; 87 acpi_object_type entry_type; 88 89 ACPI_FUNCTION_TRACE(ex_resolve_node_to_value); 90 91 /* 92 * The stack pointer points to a struct acpi_namespace_node (Node). Get the 93 * object that is attached to the Node. 94 */ 95 node = *object_ptr; 96 source_desc = acpi_ns_get_attached_object(node); 97 entry_type = acpi_ns_get_type((acpi_handle) node); 98 99 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n", 100 node, source_desc, 101 acpi_ut_get_type_name(entry_type))); 102 103 if ((entry_type == ACPI_TYPE_LOCAL_ALIAS) || 104 (entry_type == ACPI_TYPE_LOCAL_METHOD_ALIAS)) { 105 106 /* There is always exactly one level of indirection */ 107 108 node = ACPI_CAST_PTR(struct acpi_namespace_node, node->object); 109 source_desc = acpi_ns_get_attached_object(node); 110 entry_type = acpi_ns_get_type((acpi_handle) node); 111 *object_ptr = node; 112 } 113 114 /* 115 * Several object types require no further processing: 116 * 1) Device/Thermal objects don't have a "real" subobject, return the Node 117 * 2) Method locals and arguments have a pseudo-Node 118 * 3) 10/2007: Added method type to assist with Package construction. 119 */ 120 if ((entry_type == ACPI_TYPE_DEVICE) || 121 (entry_type == ACPI_TYPE_THERMAL) || 122 (entry_type == ACPI_TYPE_METHOD) || 123 (node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) { 124 return_ACPI_STATUS(AE_OK); 125 } 126 127 if (!source_desc) { 128 ACPI_ERROR((AE_INFO, "No object attached to node %p", node)); 129 return_ACPI_STATUS(AE_AML_NO_OPERAND); 130 } 131 132 /* 133 * Action is based on the type of the Node, which indicates the type 134 * of the attached object or pointer 135 */ 136 switch (entry_type) { 137 case ACPI_TYPE_PACKAGE: 138 139 if (source_desc->common.type != ACPI_TYPE_PACKAGE) { 140 ACPI_ERROR((AE_INFO, "Object not a Package, type %s", 141 acpi_ut_get_object_type_name(source_desc))); 142 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 143 } 144 145 status = acpi_ds_get_package_arguments(source_desc); 146 if (ACPI_SUCCESS(status)) { 147 148 /* Return an additional reference to the object */ 149 150 obj_desc = source_desc; 151 acpi_ut_add_reference(obj_desc); 152 } 153 break; 154 155 case ACPI_TYPE_BUFFER: 156 157 if (source_desc->common.type != ACPI_TYPE_BUFFER) { 158 ACPI_ERROR((AE_INFO, "Object not a Buffer, type %s", 159 acpi_ut_get_object_type_name(source_desc))); 160 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 161 } 162 163 status = acpi_ds_get_buffer_arguments(source_desc); 164 if (ACPI_SUCCESS(status)) { 165 166 /* Return an additional reference to the object */ 167 168 obj_desc = source_desc; 169 acpi_ut_add_reference(obj_desc); 170 } 171 break; 172 173 case ACPI_TYPE_STRING: 174 175 if (source_desc->common.type != ACPI_TYPE_STRING) { 176 ACPI_ERROR((AE_INFO, "Object not a String, type %s", 177 acpi_ut_get_object_type_name(source_desc))); 178 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 179 } 180 181 /* Return an additional reference to the object */ 182 183 obj_desc = source_desc; 184 acpi_ut_add_reference(obj_desc); 185 break; 186 187 case ACPI_TYPE_INTEGER: 188 189 if (source_desc->common.type != ACPI_TYPE_INTEGER) { 190 ACPI_ERROR((AE_INFO, "Object not a Integer, type %s", 191 acpi_ut_get_object_type_name(source_desc))); 192 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 193 } 194 195 /* Return an additional reference to the object */ 196 197 obj_desc = source_desc; 198 acpi_ut_add_reference(obj_desc); 199 break; 200 201 case ACPI_TYPE_BUFFER_FIELD: 202 case ACPI_TYPE_LOCAL_REGION_FIELD: 203 case ACPI_TYPE_LOCAL_BANK_FIELD: 204 case ACPI_TYPE_LOCAL_INDEX_FIELD: 205 206 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, 207 "FieldRead Node=%p SourceDesc=%p Type=%X\n", 208 node, source_desc, entry_type)); 209 210 status = 211 acpi_ex_read_data_from_field(walk_state, source_desc, 212 &obj_desc); 213 break; 214 215 /* For these objects, just return the object attached to the Node */ 216 217 case ACPI_TYPE_MUTEX: 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.class) { 241 case ACPI_REFCLASS_TABLE: /* This is a ddb_handle */ 242 case ACPI_REFCLASS_REFOF: 243 case ACPI_REFCLASS_INDEX: 244 245 /* Return an additional reference to the object */ 246 247 obj_desc = source_desc; 248 acpi_ut_add_reference(obj_desc); 249 break; 250 251 default: 252 /* No named references are allowed here */ 253 254 ACPI_ERROR((AE_INFO, 255 "Unsupported Reference type %X", 256 source_desc->reference.class)); 257 258 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 259 } 260 break; 261 262 default: 263 264 /* Default case is for unknown types */ 265 266 ACPI_ERROR((AE_INFO, 267 "Node %p - Unknown object type %X", 268 node, entry_type)); 269 270 return_ACPI_STATUS(AE_AML_OPERAND_TYPE); 271 272 } /* switch (entry_type) */ 273 274 /* Return the object descriptor */ 275 276 *object_ptr = (void *)obj_desc; 277 return_ACPI_STATUS(status); 278 } 279