1 /****************************************************************************** 2 * 3 * Module Name: exresnte - AML Interpreter object resolution 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2016, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44 #include "acpi.h" 45 #include "accommon.h" 46 #include "acdispat.h" 47 #include "acinterp.h" 48 #include "acnamesp.h" 49 50 51 #define _COMPONENT ACPI_EXECUTER 52 ACPI_MODULE_NAME ("exresnte") 53 54 55 /******************************************************************************* 56 * 57 * FUNCTION: AcpiExResolveNodeToValue 58 * 59 * PARAMETERS: ObjectPtr - Pointer to a location that contains 60 * a pointer to a NS node, and will receive a 61 * pointer to the resolved object. 62 * WalkState - 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 ******************************************************************************/ 80 81 ACPI_STATUS 82 AcpiExResolveNodeToValue ( 83 ACPI_NAMESPACE_NODE **ObjectPtr, 84 ACPI_WALK_STATE *WalkState) 85 86 { 87 ACPI_STATUS Status = AE_OK; 88 ACPI_OPERAND_OBJECT *SourceDesc; 89 ACPI_OPERAND_OBJECT *ObjDesc = NULL; 90 ACPI_NAMESPACE_NODE *Node; 91 ACPI_OBJECT_TYPE EntryType; 92 93 94 ACPI_FUNCTION_TRACE (ExResolveNodeToValue); 95 96 97 /* 98 * The stack pointer points to a ACPI_NAMESPACE_NODE (Node). Get the 99 * object that is attached to the Node. 100 */ 101 Node = *ObjectPtr; 102 SourceDesc = AcpiNsGetAttachedObject (Node); 103 EntryType = AcpiNsGetType ((ACPI_HANDLE) Node); 104 105 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n", 106 Node, SourceDesc, AcpiUtGetTypeName (EntryType))); 107 108 if ((EntryType == ACPI_TYPE_LOCAL_ALIAS) || 109 (EntryType == ACPI_TYPE_LOCAL_METHOD_ALIAS)) 110 { 111 /* There is always exactly one level of indirection */ 112 113 Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object); 114 SourceDesc = AcpiNsGetAttachedObject (Node); 115 EntryType = AcpiNsGetType ((ACPI_HANDLE) Node); 116 *ObjectPtr = Node; 117 } 118 119 /* 120 * Several object types require no further processing: 121 * 1) Device/Thermal objects don't have a "real" subobject, return Node 122 * 2) Method locals and arguments have a pseudo-Node 123 * 3) 10/2007: Added method type to assist with Package construction. 124 */ 125 if ((EntryType == ACPI_TYPE_DEVICE) || 126 (EntryType == ACPI_TYPE_THERMAL) || 127 (EntryType == ACPI_TYPE_METHOD) || 128 (Node->Flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) 129 { 130 return_ACPI_STATUS (AE_OK); 131 } 132 133 if (!SourceDesc) 134 { 135 ACPI_ERROR ((AE_INFO, "No object attached to node [%4.4s] %p", 136 Node->Name.Ascii, Node)); 137 return_ACPI_STATUS (AE_AML_UNINITIALIZED_NODE); 138 } 139 140 /* 141 * Action is based on the type of the Node, which indicates the type 142 * of the attached object or pointer 143 */ 144 switch (EntryType) 145 { 146 case ACPI_TYPE_PACKAGE: 147 148 if (SourceDesc->Common.Type != ACPI_TYPE_PACKAGE) 149 { 150 ACPI_ERROR ((AE_INFO, "Object not a Package, type %s", 151 AcpiUtGetObjectTypeName (SourceDesc))); 152 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 153 } 154 155 Status = AcpiDsGetPackageArguments (SourceDesc); 156 if (ACPI_SUCCESS (Status)) 157 { 158 /* Return an additional reference to the object */ 159 160 ObjDesc = SourceDesc; 161 AcpiUtAddReference (ObjDesc); 162 } 163 break; 164 165 case ACPI_TYPE_BUFFER: 166 167 if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER) 168 { 169 ACPI_ERROR ((AE_INFO, "Object not a Buffer, type %s", 170 AcpiUtGetObjectTypeName (SourceDesc))); 171 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 172 } 173 174 Status = AcpiDsGetBufferArguments (SourceDesc); 175 if (ACPI_SUCCESS (Status)) 176 { 177 /* Return an additional reference to the object */ 178 179 ObjDesc = SourceDesc; 180 AcpiUtAddReference (ObjDesc); 181 } 182 break; 183 184 case ACPI_TYPE_STRING: 185 186 if (SourceDesc->Common.Type != ACPI_TYPE_STRING) 187 { 188 ACPI_ERROR ((AE_INFO, "Object not a String, type %s", 189 AcpiUtGetObjectTypeName (SourceDesc))); 190 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 191 } 192 193 /* Return an additional reference to the object */ 194 195 ObjDesc = SourceDesc; 196 AcpiUtAddReference (ObjDesc); 197 break; 198 199 case ACPI_TYPE_INTEGER: 200 201 if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER) 202 { 203 ACPI_ERROR ((AE_INFO, "Object not a Integer, type %s", 204 AcpiUtGetObjectTypeName (SourceDesc))); 205 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 206 } 207 208 /* Return an additional reference to the object */ 209 210 ObjDesc = SourceDesc; 211 AcpiUtAddReference (ObjDesc); 212 break; 213 214 case ACPI_TYPE_BUFFER_FIELD: 215 case ACPI_TYPE_LOCAL_REGION_FIELD: 216 case ACPI_TYPE_LOCAL_BANK_FIELD: 217 case ACPI_TYPE_LOCAL_INDEX_FIELD: 218 219 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, 220 "FieldRead Node=%p SourceDesc=%p Type=%X\n", 221 Node, SourceDesc, EntryType)); 222 223 Status = AcpiExReadDataFromField (WalkState, SourceDesc, &ObjDesc); 224 break; 225 226 /* For these objects, just return the object attached to the Node */ 227 228 case ACPI_TYPE_MUTEX: 229 case ACPI_TYPE_POWER: 230 case ACPI_TYPE_PROCESSOR: 231 case ACPI_TYPE_EVENT: 232 case ACPI_TYPE_REGION: 233 234 /* Return an additional reference to the object */ 235 236 ObjDesc = SourceDesc; 237 AcpiUtAddReference (ObjDesc); 238 break; 239 240 /* TYPE_ANY is untyped, and thus there is no object associated with it */ 241 242 case ACPI_TYPE_ANY: 243 244 ACPI_ERROR ((AE_INFO, 245 "Untyped entry %p, no attached object!", Node)); 246 247 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); /* Cannot be AE_TYPE */ 248 249 case ACPI_TYPE_LOCAL_REFERENCE: 250 251 switch (SourceDesc->Reference.Class) 252 { 253 case ACPI_REFCLASS_TABLE: /* This is a DdbHandle */ 254 case ACPI_REFCLASS_REFOF: 255 case ACPI_REFCLASS_INDEX: 256 257 /* Return an additional reference to the object */ 258 259 ObjDesc = SourceDesc; 260 AcpiUtAddReference (ObjDesc); 261 break; 262 263 default: 264 265 /* No named references are allowed here */ 266 267 ACPI_ERROR ((AE_INFO, 268 "Unsupported Reference type 0x%X", 269 SourceDesc->Reference.Class)); 270 271 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 272 } 273 break; 274 275 default: 276 277 /* Default case is for unknown types */ 278 279 ACPI_ERROR ((AE_INFO, 280 "Node %p - Unknown object type 0x%X", 281 Node, EntryType)); 282 283 return_ACPI_STATUS (AE_AML_OPERAND_TYPE); 284 285 } /* switch (EntryType) */ 286 287 288 /* Return the object descriptor */ 289 290 *ObjectPtr = (void *) ObjDesc; 291 return_ACPI_STATUS (Status); 292 } 293