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 /******************************************************************************
  *
  * Module Name: exresolv - AML Interpreter object resolution
  *
  *****************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
  * All rights reserved.
  *
  * 2. License
  *
  * 2.1. This is your license from Intel Corp. under its intellectual property
  * rights.  You may have additional license terms from the party that provided
  * you this software, covering your right to use that party's intellectual
  * property rights.
  *
  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  * copy of the source code appearing in this file ("Covered Code") an
  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  * base code distributed originally by Intel ("Original Intel Code") to copy,
  * make derivatives, distribute, use and display any portion of the Covered
  * Code in any form, with the right to sublicense such rights; and
  *
  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  * license (with the right to sublicense), under only those claims of Intel
  * patents that are infringed by the Original Intel Code, to make, use, sell,
  * offer to sell, and import the Covered Code and derivative works thereof
  * solely to the minimum extent necessary to exercise the above copyright
  * license, and in no event shall the patent license extend to any additions
  * to or modifications of the Original Intel Code.  No other license or right
  * is granted directly or by implication, estoppel or otherwise;
  *
  * The above copyright and patent license is granted only if the following
  * conditions are met:
  *
  * 3. Conditions
  *
  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification with rights to further distribute source must include
  * the above Copyright Notice, the above License, this list of Conditions,
  * and the following Disclaimer and Export Compliance provision.  In addition,
  * Licensee must cause all Covered Code to which Licensee contributes to
  * contain a file documenting the changes Licensee made to create that Covered
  * Code and the date of any change.  Licensee must include in that file the
  * documentation of any changes made by any predecessor Licensee.  Licensee
  * must include a prominent statement that the modification is derived,
  * directly or indirectly, from Original Intel Code.
  *
  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification without rights to further distribute source must
  * include the following Disclaimer and Export Compliance provision in the
  * documentation and/or other materials provided with distribution.  In
  * addition, Licensee may not authorize further sublicense of source of any
  * portion of the Covered Code, and must include terms to the effect that the
  * license from Licensee to its licensee is limited to the intellectual
  * property embodied in the software Licensee provides to its licensee, and
  * not to intellectual property embodied in modifications its licensee may
  * make.
  *
  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  * substantial portion of the Covered Code or modification must reproduce the
  * above Copyright Notice, and the following Disclaimer and Export Compliance
  * provision in the documentation and/or other materials provided with the
  * distribution.
  *
  * 3.4. Intel retains all right, title, and interest in and to the Original
  * Intel Code.
  *
  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  * Intel shall be used in advertising or otherwise to promote the sale, use or
  * other dealings in products derived from or relating to the Covered Code
  * without prior written authorization from Intel.
  *
  * 4. Disclaimer and Export Compliance
  *
  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  * PARTICULAR PURPOSE.
  *
  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  * LIMITED REMEDY.
  *
  * 4.3. Licensee shall not export, either directly or indirectly, any of this
  * software or system incorporating such software without first obtaining any
  * required license or other approval from the U. S. Department of Commerce or
  * any other agency or department of the United States Government.  In the
  * event Licensee exports any such software from the United States or
  * re-exports any such software from a foreign destination, Licensee shall
  * ensure that the distribution and export/re-export of the software is in
  * compliance with all laws, regulations, orders, or other restrictions of the
  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
  * any of its subsidiaries will export/re-export any technical data, process,
  * software, or service, directly or indirectly, to any country for which the
  * United States government or any agency thereof requires an export license,
  * other governmental approval, or letter of assurance, without first obtaining
  * such license, approval or letter.
  *
  *****************************************************************************/
 
 #define __EXRESOLV_C__
 
 #include "acpi.h"
 #include "accommon.h"
 #include "amlcode.h"
 #include "acdispat.h"
 #include "acinterp.h"
 #include "acnamesp.h"
 
 
 #define _COMPONENT          ACPI_EXECUTER
         ACPI_MODULE_NAME    ("exresolv")
 
 /* Local prototypes */
 
 static ACPI_STATUS
 AcpiExResolveObjectToValue (
     ACPI_OPERAND_OBJECT     **StackPtr,
     ACPI_WALK_STATE         *WalkState);
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExResolveToValue
  *
  * PARAMETERS:  **StackPtr          - Points to entry on ObjStack, which can
  *                                    be either an (ACPI_OPERAND_OBJECT *)
  *                                    or an ACPI_HANDLE.
  *              WalkState           - Current method state
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Convert Reference objects to values
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiExResolveToValue (
     ACPI_OPERAND_OBJECT     **StackPtr,
     ACPI_WALK_STATE         *WalkState)
 {
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE_PTR (ExResolveToValue, StackPtr);
 
 
     if (!StackPtr || !*StackPtr)
     {
         ACPI_ERROR ((AE_INFO, "Internal - null pointer"));
         return_ACPI_STATUS (AE_AML_NO_OPERAND);
     }
 
     /*
      * The entity pointed to by the StackPtr can be either
      * 1) A valid ACPI_OPERAND_OBJECT, or
      * 2) A ACPI_NAMESPACE_NODE (NamedObj)
      */
     if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_OPERAND)
     {
         Status = AcpiExResolveObjectToValue (StackPtr, WalkState);
         if (ACPI_FAILURE (Status))
         {
             return_ACPI_STATUS (Status);
         }
 
         if (!*StackPtr)
         {
             ACPI_ERROR ((AE_INFO, "Internal - null pointer"));
             return_ACPI_STATUS (AE_AML_NO_OPERAND);
         }
     }
 
     /*
      * Object on the stack may have changed if AcpiExResolveObjectToValue()
      * was called (i.e., we can't use an _else_ here.)
      */
     if (ACPI_GET_DESCRIPTOR_TYPE (*StackPtr) == ACPI_DESC_TYPE_NAMED)
     {
         Status = AcpiExResolveNodeToValue (
                         ACPI_CAST_INDIRECT_PTR (ACPI_NAMESPACE_NODE, StackPtr),
                         WalkState);
         if (ACPI_FAILURE (Status))
         {
             return_ACPI_STATUS (Status);
         }
     }
 
     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Resolved object %p\n", *StackPtr));
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExResolveObjectToValue
  *
  * PARAMETERS:  StackPtr        - Pointer to an internal object
  *              WalkState       - Current method state
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Retrieve the value from an internal object. The Reference type
  *              uses the associated AML opcode to determine the value.
  *
  ******************************************************************************/
 
 static ACPI_STATUS
 AcpiExResolveObjectToValue (
     ACPI_OPERAND_OBJECT     **StackPtr,
     ACPI_WALK_STATE         *WalkState)
 {
     ACPI_STATUS             Status = AE_OK;
     ACPI_OPERAND_OBJECT     *StackDesc;
     ACPI_OPERAND_OBJECT     *ObjDesc = NULL;
     UINT8                   RefType;
 
 
     ACPI_FUNCTION_TRACE (ExResolveObjectToValue);
 
 
     StackDesc = *StackPtr;
 
     /* This is an ACPI_OPERAND_OBJECT  */
 
     switch (StackDesc->Common.Type)
     {
     case ACPI_TYPE_LOCAL_REFERENCE:
 
         RefType = StackDesc->Reference.Class;
 
         switch (RefType)
         {
         case ACPI_REFCLASS_LOCAL:
         case ACPI_REFCLASS_ARG:
 
             /*
              * Get the local from the method's state info
              * Note: this increments the local's object reference count
              */
             Status = AcpiDsMethodDataGetValue (RefType,
                             StackDesc->Reference.Value, WalkState, &ObjDesc);
             if (ACPI_FAILURE (Status))
             {
                 return_ACPI_STATUS (Status);
             }
 
             ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Arg/Local %X] ValueObj is %p\n",
                 StackDesc->Reference.Value, ObjDesc));
 
             /*
              * Now we can delete the original Reference Object and
              * replace it with the resolved value
              */
             AcpiUtRemoveReference (StackDesc);
             *StackPtr = ObjDesc;
             break;
 
 
         case ACPI_REFCLASS_INDEX:
 
             switch (StackDesc->Reference.TargetType)
             {
             case ACPI_TYPE_BUFFER_FIELD:
 
                 /* Just return - do not dereference */
                 break;
 
 
             case ACPI_TYPE_PACKAGE:
 
                 /* If method call or CopyObject - do not dereference */
 
                 if ((WalkState->Opcode == AML_INT_METHODCALL_OP) ||
                     (WalkState->Opcode == AML_COPY_OP))
                 {
                     break;
                 }
 
                 /* Otherwise, dereference the PackageIndex to a package element */
 
                 ObjDesc = *StackDesc->Reference.Where;
                 if (ObjDesc)
                 {
                     /*
                      * Valid object descriptor, copy pointer to return value
                      * (i.e., dereference the package index)
                      * Delete the ref object, increment the returned object
                      */
                     AcpiUtRemoveReference (StackDesc);
                     AcpiUtAddReference (ObjDesc);
                     *StackPtr = ObjDesc;
                 }
                 else
                 {
                     /*
                      * A NULL object descriptor means an uninitialized element of
                      * the package, can't dereference it
                      */
                     ACPI_ERROR ((AE_INFO,
                         "Attempt to dereference an Index to NULL package element Idx=%p",
                         StackDesc));
                     Status = AE_AML_UNINITIALIZED_ELEMENT;
                 }
                 break;
 
 
             default:
 
                 /* Invalid reference object */
 
                 ACPI_ERROR ((AE_INFO,
                     "Unknown TargetType %X in Index/Reference object %p",
                     StackDesc->Reference.TargetType, StackDesc));
                 Status = AE_AML_INTERNAL;
                 break;
             }
             break;
 
 
         case ACPI_REFCLASS_REFOF:
         case ACPI_REFCLASS_DEBUG:
         case ACPI_REFCLASS_TABLE:
 
             /* Just leave the object as-is, do not dereference */
 
             break;
 
         case ACPI_REFCLASS_NAME:   /* Reference to a named object */
 
             /* Dereference the name */
 
             if ((StackDesc->Reference.Node->Type == ACPI_TYPE_DEVICE) ||
                 (StackDesc->Reference.Node->Type == ACPI_TYPE_THERMAL))
             {
                 /* These node types do not have 'real' subobjects */
 
                 *StackPtr = (void *) StackDesc->Reference.Node;
             }
             else
             {
                 /* Get the object pointed to by the namespace node */
 
                 *StackPtr = (StackDesc->Reference.Node)->Object;
                 AcpiUtAddReference (*StackPtr);
             }
 
             AcpiUtRemoveReference (StackDesc);
             break;
 
         default:
 
             ACPI_ERROR ((AE_INFO,
                 "Unknown Reference type %X in %p", RefType, StackDesc));
             Status = AE_AML_INTERNAL;
             break;
         }
         break;
 
 
     case ACPI_TYPE_BUFFER:
 
         Status = AcpiDsGetBufferArguments (StackDesc);
         break;
 
 
     case ACPI_TYPE_PACKAGE:
 
         Status = AcpiDsGetPackageArguments (StackDesc);
         break;
 
 
     case ACPI_TYPE_BUFFER_FIELD:
     case ACPI_TYPE_LOCAL_REGION_FIELD:
     case ACPI_TYPE_LOCAL_BANK_FIELD:
     case ACPI_TYPE_LOCAL_INDEX_FIELD:
 
         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "FieldRead SourceDesc=%p Type=%X\n",
             StackDesc, StackDesc->Common.Type));
 
         Status = AcpiExReadDataFromField (WalkState, StackDesc, &ObjDesc);
 
         /* Remove a reference to the original operand, then override */
 
         AcpiUtRemoveReference (*StackPtr);
         *StackPtr = (void *) ObjDesc;
         break;
 
     default:
         break;
     }
 
     return_ACPI_STATUS (Status);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiExResolveMultiple
  *
  * PARAMETERS:  WalkState           - Current state (contains AML opcode)
  *              Operand             - Starting point for resolution
  *              ReturnType          - Where the object type is returned
  *              ReturnDesc          - Where the resolved object is returned
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Return the base object and type.  Traverse a reference list if
  *              necessary to get to the base object.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiExResolveMultiple (
     ACPI_WALK_STATE         *WalkState,
     ACPI_OPERAND_OBJECT     *Operand,
     ACPI_OBJECT_TYPE        *ReturnType,
     ACPI_OPERAND_OBJECT     **ReturnDesc)
 {
     ACPI_OPERAND_OBJECT     *ObjDesc = (void *) Operand;
     ACPI_NAMESPACE_NODE     *Node;
     ACPI_OBJECT_TYPE        Type;
     ACPI_STATUS             Status;
 
 
     ACPI_FUNCTION_TRACE (AcpiExResolveMultiple);
 
 
     /* Operand can be either a namespace node or an operand descriptor */
 
     switch (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc))
     {
     case ACPI_DESC_TYPE_OPERAND:
         Type = ObjDesc->Common.Type;
         break;
 
     case ACPI_DESC_TYPE_NAMED:
         Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
         ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc);
 
         /* If we had an Alias node, use the attached object for type info */
 
         if (Type == ACPI_TYPE_LOCAL_ALIAS)
         {
             Type = ((ACPI_NAMESPACE_NODE *) ObjDesc)->Type;
             ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) ObjDesc);
         }
         break;
 
     default:
         return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
     }
 
     /* If type is anything other than a reference, we are done */
 
     if (Type != ACPI_TYPE_LOCAL_REFERENCE)
     {
         goto Exit;
     }
 
     /*
      * For reference objects created via the RefOf, Index, or Load/LoadTable
      * operators, we need to get to the base object (as per the ACPI
      * specification of the ObjectType and SizeOf operators). This means
      * traversing the list of possibly many nested references.
      */
     while (ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REFERENCE)
     {
         switch (ObjDesc->Reference.Class)
         {
         case ACPI_REFCLASS_REFOF:
         case ACPI_REFCLASS_NAME:
 
             /* Dereference the reference pointer */
 
             if (ObjDesc->Reference.Class == ACPI_REFCLASS_REFOF)
             {
                 Node = ObjDesc->Reference.Object;
             }
             else /* AML_INT_NAMEPATH_OP */
             {
                 Node = ObjDesc->Reference.Node;
             }
 
             /* All "References" point to a NS node */
 
             if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED)
             {
                 ACPI_ERROR ((AE_INFO,
                     "Not a NS node %p [%s]",
                     Node, AcpiUtGetDescriptorName (Node)));
                 return_ACPI_STATUS (AE_AML_INTERNAL);
             }
 
             /* Get the attached object */
 
             ObjDesc = AcpiNsGetAttachedObject (Node);
             if (!ObjDesc)
             {
                 /* No object, use the NS node type */
 
                 Type = AcpiNsGetType (Node);
                 goto Exit;
             }
 
             /* Check for circular references */
 
             if (ObjDesc == Operand)
             {
                 return_ACPI_STATUS (AE_AML_CIRCULAR_REFERENCE);
             }
             break;
 
 
         case ACPI_REFCLASS_INDEX:
 
             /* Get the type of this reference (index into another object) */
 
             Type = ObjDesc->Reference.TargetType;
             if (Type != ACPI_TYPE_PACKAGE)
             {
                 goto Exit;
             }
 
             /*
              * The main object is a package, we want to get the type
              * of the individual package element that is referenced by
              * the index.
              *
              * This could of course in turn be another reference object.
              */
             ObjDesc = *(ObjDesc->Reference.Where);
             if (!ObjDesc)
             {
                 /* NULL package elements are allowed */
 
                 Type = 0; /* Uninitialized */
                 goto Exit;
             }
             break;
 
 
         case ACPI_REFCLASS_TABLE:
 
             Type = ACPI_TYPE_DDB_HANDLE;
             goto Exit;
 
 
         case ACPI_REFCLASS_LOCAL:
         case ACPI_REFCLASS_ARG:
 
             if (ReturnDesc)
             {
                 Status = AcpiDsMethodDataGetValue (ObjDesc->Reference.Class,
                             ObjDesc->Reference.Value, WalkState, &ObjDesc);
                 if (ACPI_FAILURE (Status))
                 {
                     return_ACPI_STATUS (Status);
                 }
                 AcpiUtRemoveReference (ObjDesc);
             }
             else
             {
                 Status = AcpiDsMethodDataGetNode (ObjDesc->Reference.Class,
                             ObjDesc->Reference.Value, WalkState, &Node);
                 if (ACPI_FAILURE (Status))
                 {
                     return_ACPI_STATUS (Status);
                 }
 
                 ObjDesc = AcpiNsGetAttachedObject (Node);
                 if (!ObjDesc)
                 {
                     Type = ACPI_TYPE_ANY;
                     goto Exit;
                 }
             }
             break;
 
 
         case ACPI_REFCLASS_DEBUG:
 
             /* The Debug Object is of type "DebugObject" */
 
             Type = ACPI_TYPE_DEBUG_OBJECT;
             goto Exit;
 
 
         default:
 
             ACPI_ERROR ((AE_INFO,
                 "Unknown Reference Class %2.2X", ObjDesc->Reference.Class));
             return_ACPI_STATUS (AE_AML_INTERNAL);
         }
     }
 
     /*
      * Now we are guaranteed to have an object that has not been created
      * via the RefOf or Index operators.
      */
     Type = ObjDesc->Common.Type;
 
 
 Exit:
     /* Convert internal types to external types */
 
     switch (Type)
     {
     case ACPI_TYPE_LOCAL_REGION_FIELD:
     case ACPI_TYPE_LOCAL_BANK_FIELD:
     case ACPI_TYPE_LOCAL_INDEX_FIELD:
 
         Type = ACPI_TYPE_FIELD_UNIT;
         break;
 
     case ACPI_TYPE_LOCAL_SCOPE:
 
         /* Per ACPI Specification, Scope is untyped */
 
         Type = ACPI_TYPE_ANY;
         break;
 
     default:
         /* No change to Type required */
         break;
     }
 
     *ReturnType = Type;
     if (ReturnDesc)
     {
         *ReturnDesc = ObjDesc;
     }
     return_ACPI_STATUS (AE_OK);
 }