| 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 | |