1 /******************************************************************************
   2  *
   3  * Module Name: exresnte - AML Interpreter object resolution
   4  *
   5  *****************************************************************************/
   6 
   7 /*
   8  * Copyright (C) 2000 - 2014, 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 #define __EXRESNTE_C__
  45 
  46 #include "acpi.h"
  47 #include "accommon.h"
  48 #include "acdispat.h"
  49 #include "acinterp.h"
  50 #include "acnamesp.h"
  51 
  52 
  53 #define _COMPONENT          ACPI_EXECUTER
  54         ACPI_MODULE_NAME    ("exresnte")
  55 
  56 
  57 /*******************************************************************************
  58  *
  59  * FUNCTION:    AcpiExResolveNodeToValue
  60  *
  61  * PARAMETERS:  ObjectPtr       - Pointer to a location that contains
  62  *                                a pointer to a NS node, and will receive a
  63  *                                pointer to the resolved object.
  64  *              WalkState       - Current state. Valid only if executing AML
  65  *                                code. NULL if simply resolving an object
  66  *
  67  * RETURN:      Status
  68  *
  69  * DESCRIPTION: Resolve a Namespace node to a valued object
  70  *
  71  * Note: for some of the data types, the pointer attached to the Node
  72  * can be either a pointer to an actual internal object or a pointer into the
  73  * AML stream itself. These types are currently:
  74  *
  75  *      ACPI_TYPE_INTEGER
  76  *      ACPI_TYPE_STRING
  77  *      ACPI_TYPE_BUFFER
  78  *      ACPI_TYPE_MUTEX
  79  *      ACPI_TYPE_PACKAGE
  80  *
  81  ******************************************************************************/
  82 
  83 ACPI_STATUS
  84 AcpiExResolveNodeToValue (
  85     ACPI_NAMESPACE_NODE     **ObjectPtr,
  86     ACPI_WALK_STATE         *WalkState)
  87 
  88 {
  89     ACPI_STATUS             Status = AE_OK;
  90     ACPI_OPERAND_OBJECT     *SourceDesc;
  91     ACPI_OPERAND_OBJECT     *ObjDesc = NULL;
  92     ACPI_NAMESPACE_NODE     *Node;
  93     ACPI_OBJECT_TYPE        EntryType;
  94 
  95 
  96     ACPI_FUNCTION_TRACE (ExResolveNodeToValue);
  97 
  98 
  99     /*
 100      * The stack pointer points to a ACPI_NAMESPACE_NODE (Node). Get the
 101      * object that is attached to the Node.
 102      */
 103     Node       = *ObjectPtr;
 104     SourceDesc = AcpiNsGetAttachedObject (Node);
 105     EntryType  = AcpiNsGetType ((ACPI_HANDLE) Node);
 106 
 107     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Entry=%p SourceDesc=%p [%s]\n",
 108          Node, SourceDesc, AcpiUtGetTypeName (EntryType)));
 109 
 110     if ((EntryType == ACPI_TYPE_LOCAL_ALIAS) ||
 111         (EntryType == ACPI_TYPE_LOCAL_METHOD_ALIAS))
 112     {
 113         /* There is always exactly one level of indirection */
 114 
 115         Node       = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Node->Object);
 116         SourceDesc = AcpiNsGetAttachedObject (Node);
 117         EntryType  = AcpiNsGetType ((ACPI_HANDLE) Node);
 118         *ObjectPtr = Node;
 119     }
 120 
 121     /*
 122      * Several object types require no further processing:
 123      * 1) Device/Thermal objects don't have a "real" subobject, return the Node
 124      * 2) Method locals and arguments have a pseudo-Node
 125      * 3) 10/2007: Added method type to assist with Package construction.
 126      */
 127     if ((EntryType == ACPI_TYPE_DEVICE)  ||
 128         (EntryType == ACPI_TYPE_THERMAL) ||
 129         (EntryType == ACPI_TYPE_METHOD)  ||
 130         (Node->Flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL)))
 131     {
 132         return_ACPI_STATUS (AE_OK);
 133     }
 134 
 135     if (!SourceDesc)
 136     {
 137         ACPI_ERROR ((AE_INFO, "No object attached to node [%4.4s] %p",
 138             Node->Name.Ascii, Node));
 139         return_ACPI_STATUS (AE_AML_NO_OPERAND);
 140     }
 141 
 142     /*
 143      * Action is based on the type of the Node, which indicates the type
 144      * of the attached object or pointer
 145      */
 146     switch (EntryType)
 147     {
 148     case ACPI_TYPE_PACKAGE:
 149 
 150         if (SourceDesc->Common.Type != ACPI_TYPE_PACKAGE)
 151         {
 152             ACPI_ERROR ((AE_INFO, "Object not a Package, type %s",
 153                 AcpiUtGetObjectTypeName (SourceDesc)));
 154             return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 155         }
 156 
 157         Status = AcpiDsGetPackageArguments (SourceDesc);
 158         if (ACPI_SUCCESS (Status))
 159         {
 160             /* Return an additional reference to the object */
 161 
 162             ObjDesc = SourceDesc;
 163             AcpiUtAddReference (ObjDesc);
 164         }
 165         break;
 166 
 167     case ACPI_TYPE_BUFFER:
 168 
 169         if (SourceDesc->Common.Type != ACPI_TYPE_BUFFER)
 170         {
 171             ACPI_ERROR ((AE_INFO, "Object not a Buffer, type %s",
 172                 AcpiUtGetObjectTypeName (SourceDesc)));
 173             return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 174         }
 175 
 176         Status = AcpiDsGetBufferArguments (SourceDesc);
 177         if (ACPI_SUCCESS (Status))
 178         {
 179             /* Return an additional reference to the object */
 180 
 181             ObjDesc = SourceDesc;
 182             AcpiUtAddReference (ObjDesc);
 183         }
 184         break;
 185 
 186     case ACPI_TYPE_STRING:
 187 
 188         if (SourceDesc->Common.Type != ACPI_TYPE_STRING)
 189         {
 190             ACPI_ERROR ((AE_INFO, "Object not a String, type %s",
 191                 AcpiUtGetObjectTypeName (SourceDesc)));
 192             return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 193         }
 194 
 195         /* Return an additional reference to the object */
 196 
 197         ObjDesc = SourceDesc;
 198         AcpiUtAddReference (ObjDesc);
 199         break;
 200 
 201     case ACPI_TYPE_INTEGER:
 202 
 203         if (SourceDesc->Common.Type != ACPI_TYPE_INTEGER)
 204         {
 205             ACPI_ERROR ((AE_INFO, "Object not a Integer, type %s",
 206                 AcpiUtGetObjectTypeName (SourceDesc)));
 207             return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 208         }
 209 
 210         /* Return an additional reference to the object */
 211 
 212         ObjDesc = SourceDesc;
 213         AcpiUtAddReference (ObjDesc);
 214         break;
 215 
 216     case ACPI_TYPE_BUFFER_FIELD:
 217     case ACPI_TYPE_LOCAL_REGION_FIELD:
 218     case ACPI_TYPE_LOCAL_BANK_FIELD:
 219     case ACPI_TYPE_LOCAL_INDEX_FIELD:
 220 
 221         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 222             "FieldRead Node=%p SourceDesc=%p Type=%X\n",
 223             Node, SourceDesc, EntryType));
 224 
 225         Status = AcpiExReadDataFromField (WalkState, SourceDesc, &ObjDesc);
 226         break;
 227 
 228     /* For these objects, just return the object attached to the Node */
 229 
 230     case ACPI_TYPE_MUTEX:
 231     case ACPI_TYPE_POWER:
 232     case ACPI_TYPE_PROCESSOR:
 233     case ACPI_TYPE_EVENT:
 234     case ACPI_TYPE_REGION:
 235 
 236         /* Return an additional reference to the object */
 237 
 238         ObjDesc = SourceDesc;
 239         AcpiUtAddReference (ObjDesc);
 240         break;
 241 
 242     /* TYPE_ANY is untyped, and thus there is no object associated with it */
 243 
 244     case ACPI_TYPE_ANY:
 245 
 246         ACPI_ERROR ((AE_INFO,
 247             "Untyped entry %p, no attached object!", Node));
 248 
 249         return_ACPI_STATUS (AE_AML_OPERAND_TYPE);  /* Cannot be AE_TYPE */
 250 
 251     case ACPI_TYPE_LOCAL_REFERENCE:
 252 
 253         switch (SourceDesc->Reference.Class)
 254         {
 255         case ACPI_REFCLASS_TABLE:   /* This is a DdbHandle */
 256         case ACPI_REFCLASS_REFOF:
 257         case ACPI_REFCLASS_INDEX:
 258 
 259             /* Return an additional reference to the object */
 260 
 261             ObjDesc = SourceDesc;
 262             AcpiUtAddReference (ObjDesc);
 263             break;
 264 
 265         default:
 266 
 267             /* No named references are allowed here */
 268 
 269             ACPI_ERROR ((AE_INFO,
 270                 "Unsupported Reference type 0x%X",
 271                 SourceDesc->Reference.Class));
 272 
 273             return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 274         }
 275         break;
 276 
 277     default:
 278 
 279         /* Default case is for unknown types */
 280 
 281         ACPI_ERROR ((AE_INFO,
 282             "Node %p - Unknown object type 0x%X",
 283             Node, EntryType));
 284 
 285         return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
 286 
 287     } /* switch (EntryType) */
 288 
 289 
 290     /* Return the object descriptor */
 291 
 292     *ObjectPtr = (void *) ObjDesc;
 293     return_ACPI_STATUS (Status);
 294 }