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 /*******************************************************************************
  *
  * Module Name: nsobject - Utilities for objects attached to namespace
  *                         table entries
  *
  ******************************************************************************/
 
 /******************************************************************************
  *
  * 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 __NSOBJECT_C__
 
 #include "acpi.h"
 #include "accommon.h"
 #include "acnamesp.h"
 
 
 #define _COMPONENT          ACPI_NAMESPACE
         ACPI_MODULE_NAME    ("nsobject")
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsAttachObject
  *
  * PARAMETERS:  Node                - Parent Node
  *              Object              - Object to be attached
  *              Type                - Type of object, or ACPI_TYPE_ANY if not
  *                                    known
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Record the given object as the value associated with the
  *              name whose ACPI_HANDLE is passed.  If Object is NULL
  *              and Type is ACPI_TYPE_ANY, set the name as having no value.
  *              Note: Future may require that the Node->Flags field be passed
  *              as a parameter.
  *
  * MUTEX:       Assumes namespace is locked
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsAttachObject (
     ACPI_NAMESPACE_NODE     *Node,
     ACPI_OPERAND_OBJECT     *Object,
     ACPI_OBJECT_TYPE        Type)
 {
     ACPI_OPERAND_OBJECT     *ObjDesc;
     ACPI_OPERAND_OBJECT     *LastObjDesc;
     ACPI_OBJECT_TYPE        ObjectType = ACPI_TYPE_ANY;
 
 
     ACPI_FUNCTION_TRACE (NsAttachObject);
 
 
     /*
      * Parameter validation
      */
     if (!Node)
     {
         /* Invalid handle */
 
         ACPI_ERROR ((AE_INFO, "Null NamedObj handle"));
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     if (!Object && (ACPI_TYPE_ANY != Type))
     {
         /* Null object */
 
         ACPI_ERROR ((AE_INFO,
             "Null object, but type not ACPI_TYPE_ANY"));
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED)
     {
         /* Not a name handle */
 
         ACPI_ERROR ((AE_INFO, "Invalid handle %p [%s]",
             Node, AcpiUtGetDescriptorName (Node)));
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     /* Check if this object is already attached */
 
     if (Node->Object == Object)
     {
         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
             "Obj %p already installed in NameObj %p\n",
             Object, Node));
 
         return_ACPI_STATUS (AE_OK);
     }
 
     /* If null object, we will just install it */
 
     if (!Object)
     {
         ObjDesc    = NULL;
         ObjectType = ACPI_TYPE_ANY;
     }
 
     /*
      * If the source object is a namespace Node with an attached object,
      * we will use that (attached) object
      */
     else if ((ACPI_GET_DESCRIPTOR_TYPE (Object) == ACPI_DESC_TYPE_NAMED) &&
             ((ACPI_NAMESPACE_NODE *) Object)->Object)
     {
         /*
          * Value passed is a name handle and that name has a
          * non-null value.  Use that name's value and type.
          */
         ObjDesc    = ((ACPI_NAMESPACE_NODE *) Object)->Object;
         ObjectType = ((ACPI_NAMESPACE_NODE *) Object)->Type;
     }
 
     /*
      * Otherwise, we will use the parameter object, but we must type
      * it first
      */
     else
     {
         ObjDesc = (ACPI_OPERAND_OBJECT  *) Object;
 
         /* Use the given type */
 
         ObjectType = Type;
     }
 
     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Installing %p into Node %p [%4.4s]\n",
         ObjDesc, Node, AcpiUtGetNodeName (Node)));
 
     /* Detach an existing attached object if present */
 
     if (Node->Object)
     {
         AcpiNsDetachObject (Node);
     }
 
     if (ObjDesc)
     {
         /*
          * Must increment the new value's reference count
          * (if it is an internal object)
          */
         AcpiUtAddReference (ObjDesc);
 
         /*
          * Handle objects with multiple descriptors - walk
          * to the end of the descriptor list
          */
         LastObjDesc = ObjDesc;
         while (LastObjDesc->Common.NextObject)
         {
             LastObjDesc = LastObjDesc->Common.NextObject;
         }
 
         /* Install the object at the front of the object list */
 
         LastObjDesc->Common.NextObject = Node->Object;
     }
 
     Node->Type     = (UINT8) ObjectType;
     Node->Object   = ObjDesc;
 
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsDetachObject
  *
  * PARAMETERS:  Node           - A Namespace node whose object will be detached
  *
  * RETURN:      None.
  *
  * DESCRIPTION: Detach/delete an object associated with a namespace node.
  *              if the object is an allocated object, it is freed.
  *              Otherwise, the field is simply cleared.
  *
  ******************************************************************************/
 
 void
 AcpiNsDetachObject (
     ACPI_NAMESPACE_NODE     *Node)
 {
     ACPI_OPERAND_OBJECT     *ObjDesc;
 
 
     ACPI_FUNCTION_TRACE (NsDetachObject);
 
 
     ObjDesc = Node->Object;
 
     if (!ObjDesc ||
         (ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA))
     {
         return_VOID;
     }
 
     if (Node->Flags & ANOBJ_ALLOCATED_BUFFER)
     {
         /* Free the dynamic aml buffer */
 
         if (ObjDesc->Common.Type == ACPI_TYPE_METHOD)
         {
             ACPI_FREE (ObjDesc->Method.AmlStart);
         }
     }
 
     /* Clear the entry in all cases */
 
     Node->Object = NULL;
     if (ACPI_GET_DESCRIPTOR_TYPE (ObjDesc) == ACPI_DESC_TYPE_OPERAND)
     {
         Node->Object = ObjDesc->Common.NextObject;
         if (Node->Object &&
            ((Node->Object)->Common.Type != ACPI_TYPE_LOCAL_DATA))
         {
             Node->Object = Node->Object->Common.NextObject;
         }
     }
 
     /* Reset the node type to untyped */
 
     Node->Type = ACPI_TYPE_ANY;
 
     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Node %p [%4.4s] Object %p\n",
         Node, AcpiUtGetNodeName (Node), ObjDesc));
 
     /* Remove one reference on the object (and all subobjects) */
 
     AcpiUtRemoveReference (ObjDesc);
     return_VOID;
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsGetAttachedObject
  *
  * PARAMETERS:  Node             - Namespace node
  *
  * RETURN:      Current value of the object field from the Node whose
  *              handle is passed
  *
  * DESCRIPTION: Obtain the object attached to a namespace node.
  *
  ******************************************************************************/
 
 ACPI_OPERAND_OBJECT *
 AcpiNsGetAttachedObject (
     ACPI_NAMESPACE_NODE     *Node)
 {
     ACPI_FUNCTION_TRACE_PTR (NsGetAttachedObject, Node);
 
 
     if (!Node)
     {
         ACPI_WARNING ((AE_INFO, "Null Node ptr"));
         return_PTR (NULL);
     }
 
     if (!Node->Object ||
             ((ACPI_GET_DESCRIPTOR_TYPE (Node->Object) != ACPI_DESC_TYPE_OPERAND) &&
              (ACPI_GET_DESCRIPTOR_TYPE (Node->Object) != ACPI_DESC_TYPE_NAMED))  ||
         ((Node->Object)->Common.Type == ACPI_TYPE_LOCAL_DATA))
     {
         return_PTR (NULL);
     }
 
     return_PTR (Node->Object);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsGetSecondaryObject
  *
  * PARAMETERS:  Node             - Namespace node
  *
  * RETURN:      Current value of the object field from the Node whose
  *              handle is passed.
  *
  * DESCRIPTION: Obtain a secondary object associated with a namespace node.
  *
  ******************************************************************************/
 
 ACPI_OPERAND_OBJECT *
 AcpiNsGetSecondaryObject (
     ACPI_OPERAND_OBJECT     *ObjDesc)
 {
     ACPI_FUNCTION_TRACE_PTR (NsGetSecondaryObject, ObjDesc);
 
 
     if ((!ObjDesc)                                     ||
         (ObjDesc->Common.Type== ACPI_TYPE_LOCAL_DATA)  ||
         (!ObjDesc->Common.NextObject)                  ||
         ((ObjDesc->Common.NextObject)->Common.Type == ACPI_TYPE_LOCAL_DATA))
     {
         return_PTR (NULL);
     }
 
     return_PTR (ObjDesc->Common.NextObject);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsAttachData
  *
  * PARAMETERS:  Node            - Namespace node
  *              Handler         - Handler to be associated with the data
  *              Data            - Data to be attached
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Low-level attach data.  Create and attach a Data object.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsAttachData (
     ACPI_NAMESPACE_NODE     *Node,
     ACPI_OBJECT_HANDLER     Handler,
     void                    *Data)
 {
     ACPI_OPERAND_OBJECT     *PrevObjDesc;
     ACPI_OPERAND_OBJECT     *ObjDesc;
     ACPI_OPERAND_OBJECT     *DataDesc;
 
 
     /* We only allow one attachment per handler */
 
     PrevObjDesc = NULL;
     ObjDesc = Node->Object;
     while (ObjDesc)
     {
         if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA) &&
             (ObjDesc->Data.Handler == Handler))
         {
             return (AE_ALREADY_EXISTS);
         }
 
         PrevObjDesc = ObjDesc;
         ObjDesc = ObjDesc->Common.NextObject;
     }
 
     /* Create an internal object for the data */
 
     DataDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_DATA);
     if (!DataDesc)
     {
         return (AE_NO_MEMORY);
     }
 
     DataDesc->Data.Handler = Handler;
     DataDesc->Data.Pointer = Data;
 
     /* Install the data object */
 
     if (PrevObjDesc)
     {
         PrevObjDesc->Common.NextObject = DataDesc;
     }
     else
     {
         Node->Object = DataDesc;
     }
 
     return (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsDetachData
  *
  * PARAMETERS:  Node            - Namespace node
  *              Handler         - Handler associated with the data
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Low-level detach data.  Delete the data node, but the caller
  *              is responsible for the actual data.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsDetachData (
     ACPI_NAMESPACE_NODE     *Node,
     ACPI_OBJECT_HANDLER     Handler)
 {
     ACPI_OPERAND_OBJECT     *ObjDesc;
     ACPI_OPERAND_OBJECT     *PrevObjDesc;
 
 
     PrevObjDesc = NULL;
     ObjDesc = Node->Object;
     while (ObjDesc)
     {
         if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA) &&
             (ObjDesc->Data.Handler == Handler))
         {
             if (PrevObjDesc)
             {
                 PrevObjDesc->Common.NextObject = ObjDesc->Common.NextObject;
             }
             else
             {
                 Node->Object = ObjDesc->Common.NextObject;
             }
 
             AcpiUtRemoveReference (ObjDesc);
             return (AE_OK);
         }
 
         PrevObjDesc = ObjDesc;
         ObjDesc = ObjDesc->Common.NextObject;
     }
 
     return (AE_NOT_FOUND);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsGetAttachedData
  *
  * PARAMETERS:  Node            - Namespace node
  *              Handler         - Handler associated with the data
  *              Data            - Where the data is returned
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Low level interface to obtain data previously associated with
  *              a namespace node.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsGetAttachedData (
     ACPI_NAMESPACE_NODE     *Node,
     ACPI_OBJECT_HANDLER     Handler,
     void                    **Data)
 {
     ACPI_OPERAND_OBJECT     *ObjDesc;
 
 
     ObjDesc = Node->Object;
     while (ObjDesc)
     {
         if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_DATA) &&
             (ObjDesc->Data.Handler == Handler))
         {
             *Data = ObjDesc->Data.Pointer;
             return (AE_OK);
         }
 
         ObjDesc = ObjDesc->Common.NextObject;
     }
 
     return (AE_NOT_FOUND);
 }