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 /*******************************************************************************
  *
  * Module Name: nseval - Object evaluation, includes control method execution
  *
  ******************************************************************************/
 
 /******************************************************************************
  *
  * 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 __NSEVAL_C__
 
 #include "acpi.h"
 #include "accommon.h"
 #include "acparser.h"
 #include "acinterp.h"
 #include "acnamesp.h"
 
 
 #define _COMPONENT          ACPI_NAMESPACE
         ACPI_MODULE_NAME    ("nseval")
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsEvaluate
  *
  * PARAMETERS:  Info            - Evaluation info block, contains:
  *                  PrefixNode      - Prefix or Method/Object Node to execute
  *                  Pathname        - Name of method to execute, If NULL, the
  *                                    Node is the object to execute
  *                  Parameters      - List of parameters to pass to the method,
  *                                    terminated by NULL. Params itself may be
  *                                    NULL if no parameters are being passed.
  *                  ReturnObject    - Where to put method's return value (if
  *                                    any). If NULL, no value is returned.
  *                  ParameterType   - Type of Parameter list
  *                  ReturnObject    - Where to put method's return value (if
  *                                    any). If NULL, no value is returned.
  *                  Flags           - ACPI_IGNORE_RETURN_VALUE to delete return
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Execute a control method or return the current value of an
  *              ACPI namespace object.
  *
  * MUTEX:       Locks interpreter
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsEvaluate (
     ACPI_EVALUATE_INFO      *Info)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
 
 
     ACPI_FUNCTION_TRACE (NsEvaluate);
 
 
     if (!Info)
     {
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     /* Initialize the return value to an invalid object */
 
     Info->ReturnObject = NULL;
     Info->ParamCount = 0;
 
     /*
      * Get the actual namespace node for the target object. Handles these cases:
      *
      * 1) Null node, Pathname (absolute path)
      * 2) Node, Pathname (path relative to Node)
      * 3) Node, Null Pathname
      */
     Status = AcpiNsGetNode (Info->PrefixNode, Info->Pathname,
                 ACPI_NS_NO_UPSEARCH, &Info->ResolvedNode);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     /*
      * For a method alias, we must grab the actual method node so that proper
      * scoping context will be established before execution.
      */
     if (AcpiNsGetType (Info->ResolvedNode) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
     {
         Info->ResolvedNode =
             ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Info->ResolvedNode->Object);
     }
 
     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n", Info->Pathname,
         Info->ResolvedNode, AcpiNsGetAttachedObject (Info->ResolvedNode)));
 
     Node = Info->ResolvedNode;
 
     /*
      * Two major cases here:
      *
      * 1) The object is a control method -- execute it
      * 2) The object is not a method -- just return it's current value
      */
     if (AcpiNsGetType (Info->ResolvedNode) == ACPI_TYPE_METHOD)
     {
         /*
          * 1) Object is a control method - execute it
          */
 
         /* Verify that there is a method object associated with this node */
 
         Info->ObjDesc = AcpiNsGetAttachedObject (Info->ResolvedNode);
         if (!Info->ObjDesc)
         {
             ACPI_ERROR ((AE_INFO, "Control method has no attached sub-object"));
             return_ACPI_STATUS (AE_NULL_OBJECT);
         }
 
         /* Count the number of arguments being passed to the method */
 
         if (Info->Parameters)
         {
             while (Info->Parameters[Info->ParamCount])
             {
                 if (Info->ParamCount > ACPI_METHOD_MAX_ARG)
                 {
                     return_ACPI_STATUS (AE_LIMIT);
                 }
                 Info->ParamCount++;
             }
         }
 
         ACPI_DUMP_PATHNAME (Info->ResolvedNode, "ACPI: Execute Method",
             ACPI_LV_INFO, _COMPONENT);
 
         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
             "Method at AML address %p Length %X\n",
             Info->ObjDesc->Method.AmlStart + 1,
             Info->ObjDesc->Method.AmlLength - 1));
 
         /*
          * Any namespace deletion must acquire both the namespace and
          * interpreter locks to ensure that no thread is using the portion of
          * the namespace that is being deleted.
          *
          * Execute the method via the interpreter. The interpreter is locked
          * here before calling into the AML parser
          */
         AcpiExEnterInterpreter ();
         Status = AcpiPsExecuteMethod (Info);
         AcpiExExitInterpreter ();
     }
     else
     {
         /*
          * 2) Object is not a method, return its current value
          *
          * Disallow certain object types. For these, "evaluation" is undefined.
          */
         switch (Info->ResolvedNode->Type)
         {
         case ACPI_TYPE_DEVICE:
         case ACPI_TYPE_EVENT:
         case ACPI_TYPE_MUTEX:
         case ACPI_TYPE_REGION:
         case ACPI_TYPE_THERMAL:
         case ACPI_TYPE_LOCAL_SCOPE:
 
             ACPI_ERROR ((AE_INFO,
                 "[%4.4s] Evaluation of object type [%s] is not supported",
                 Info->ResolvedNode->Name.Ascii,
                 AcpiUtGetTypeName (Info->ResolvedNode->Type)));
 
             return_ACPI_STATUS (AE_TYPE);
 
         default:
             break;
         }
 
         /*
          * Objects require additional resolution steps (e.g., the Node may be
          * a field that must be read, etc.) -- we can't just grab the object
          * out of the node.
          *
          * Use ResolveNodeToValue() to get the associated value.
          *
          * NOTE: we can get away with passing in NULL for a walk state because
          * ResolvedNode is guaranteed to not be a reference to either a method
          * local or a method argument (because this interface is never called
          * from a running method.)
          *
          * Even though we do not directly invoke the interpreter for object
          * resolution, we must lock it because we could access an opregion.
          * The opregion access code assumes that the interpreter is locked.
          */
         AcpiExEnterInterpreter ();
 
         /* Function has a strange interface */
 
         Status = AcpiExResolveNodeToValue (&Info->ResolvedNode, NULL);
         AcpiExExitInterpreter ();
 
         /*
          * If AcpiExResolveNodeToValue() succeeded, the return value was placed
          * in ResolvedNode.
          */
         if (ACPI_SUCCESS (Status))
         {
             Status = AE_CTRL_RETURN_VALUE;
             Info->ReturnObject =
                 ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Info->ResolvedNode);
 
             ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returning object %p [%s]\n",
                 Info->ReturnObject,
                 AcpiUtGetObjectTypeName (Info->ReturnObject)));
         }
     }
 
     /*
      * Check input argument count against the ASL-defined count for a method.
      * Also check predefined names: argument count and return value against
      * the ACPI specification. Some incorrect return value types are repaired.
      */
     (void) AcpiNsCheckPredefinedNames (Node, Info->ParamCount,
                 Status, &Info->ReturnObject);
 
     /* Check if there is a return value that must be dealt with */
 
     if (Status == AE_CTRL_RETURN_VALUE)
     {
         /* If caller does not want the return value, delete it */
 
         if (Info->Flags & ACPI_IGNORE_RETURN_VALUE)
         {
             AcpiUtRemoveReference (Info->ReturnObject);
             Info->ReturnObject = NULL;
         }
 
         /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
 
         Status = AE_OK;
     }
 
     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
         "*** Completed evaluation of object %s ***\n", Info->Pathname));
 
     /*
      * Namespace was unlocked by the handling AcpiNs* function, so we
      * just return
      */
     return_ACPI_STATUS (Status);
 }