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 /*******************************************************************************
  *
  * Module Name: rsxface - Public interfaces to the resource manager
  *
  ******************************************************************************/
 
 /******************************************************************************
  *
  * 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 __RSXFACE_C__
 
 #include "acpi.h"
 #include "accommon.h"
 #include "acresrc.h"
 #include "acnamesp.h"
 
 #define _COMPONENT          ACPI_RESOURCES
         ACPI_MODULE_NAME    ("rsxface")
 
 /* Local macros for 16,32-bit to 64-bit conversion */
 
 #define ACPI_COPY_FIELD(Out, In, Field)  ((Out)->Field = (In)->Field)
 #define ACPI_COPY_ADDRESS(Out, In)                      \
     ACPI_COPY_FIELD(Out, In, ResourceType);              \
     ACPI_COPY_FIELD(Out, In, ProducerConsumer);          \
     ACPI_COPY_FIELD(Out, In, Decode);                    \
     ACPI_COPY_FIELD(Out, In, MinAddressFixed);           \
     ACPI_COPY_FIELD(Out, In, MaxAddressFixed);           \
     ACPI_COPY_FIELD(Out, In, Info);                      \
     ACPI_COPY_FIELD(Out, In, Granularity);               \
     ACPI_COPY_FIELD(Out, In, Minimum);                   \
     ACPI_COPY_FIELD(Out, In, Maximum);                   \
     ACPI_COPY_FIELD(Out, In, TranslationOffset);         \
     ACPI_COPY_FIELD(Out, In, AddressLength);             \
     ACPI_COPY_FIELD(Out, In, ResourceSource);
 
 
 /* Local prototypes */
 
 static ACPI_STATUS
 AcpiRsMatchVendorResource (
     ACPI_RESOURCE           *Resource,
     void                    *Context);
 
 static ACPI_STATUS
 AcpiRsValidateParameters (
     ACPI_HANDLE             DeviceHandle,
     ACPI_BUFFER             *Buffer,
     ACPI_NAMESPACE_NODE     **ReturnNode);
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiRsValidateParameters
  *
  * PARAMETERS:  DeviceHandle    - Handle to a device
  *              Buffer          - Pointer to a data buffer
  *              ReturnNode      - Pointer to where the device node is returned
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Common parameter validation for resource interfaces
  *
  ******************************************************************************/
 
 static ACPI_STATUS
 AcpiRsValidateParameters (
     ACPI_HANDLE             DeviceHandle,
     ACPI_BUFFER             *Buffer,
     ACPI_NAMESPACE_NODE     **ReturnNode)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
 
 
     ACPI_FUNCTION_TRACE (RsValidateParameters);
 
 
     /*
      * Must have a valid handle to an ACPI device
      */
     if (!DeviceHandle)
     {
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     Node = AcpiNsMapHandleToNode (DeviceHandle);
     if (!Node)
     {
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     if (Node->Type != ACPI_TYPE_DEVICE)
     {
         return_ACPI_STATUS (AE_TYPE);
     }
 
     /*
      * Validate the user buffer object
      *
      * if there is a non-zero buffer length we also need a valid pointer in
      * the buffer. If it's a zero buffer length, we'll be returning the
      * needed buffer size (later), so keep going.
      */
     Status = AcpiUtValidateBuffer (Buffer);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     *ReturnNode = Node;
     return_ACPI_STATUS (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiGetIrqRoutingTable
  *
  * PARAMETERS:  DeviceHandle    - Handle to the Bus device we are querying
  *              RetBuffer       - Pointer to a buffer to receive the
  *                                current resources for the device
  *
  * RETURN:      Status
  *
  * DESCRIPTION: This function is called to get the IRQ routing table for a
  *              specific bus. The caller must first acquire a handle for the
  *              desired bus. The routine table is placed in the buffer pointed
  *              to by the RetBuffer variable parameter.
  *
  *              If the function fails an appropriate status will be returned
  *              and the value of RetBuffer is undefined.
  *
  *              This function attempts to execute the _PRT method contained in
  *              the object indicated by the passed DeviceHandle.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiGetIrqRoutingTable  (
     ACPI_HANDLE             DeviceHandle,
     ACPI_BUFFER             *RetBuffer)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
 
 
     ACPI_FUNCTION_TRACE (AcpiGetIrqRoutingTable);
 
 
     /* Validate parameters then dispatch to internal routine */
 
     Status = AcpiRsValidateParameters (DeviceHandle, RetBuffer, &Node);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     Status = AcpiRsGetPrtMethodData (Node, RetBuffer);
     return_ACPI_STATUS (Status);
 }
 
 ACPI_EXPORT_SYMBOL (AcpiGetIrqRoutingTable)
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiGetCurrentResources
  *
  * PARAMETERS:  DeviceHandle    - Handle to the device object for the
  *                                device we are querying
  *              RetBuffer       - Pointer to a buffer to receive the
  *                                current resources for the device
  *
  * RETURN:      Status
  *
  * DESCRIPTION: This function is called to get the current resources for a
  *              specific device. The caller must first acquire a handle for
  *              the desired device. The resource data is placed in the buffer
  *              pointed to by the RetBuffer variable parameter.
  *
  *              If the function fails an appropriate status will be returned
  *              and the value of RetBuffer is undefined.
  *
  *              This function attempts to execute the _CRS method contained in
  *              the object indicated by the passed DeviceHandle.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiGetCurrentResources (
     ACPI_HANDLE             DeviceHandle,
     ACPI_BUFFER             *RetBuffer)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
 
 
     ACPI_FUNCTION_TRACE (AcpiGetCurrentResources);
 
 
     /* Validate parameters then dispatch to internal routine */
 
     Status = AcpiRsValidateParameters (DeviceHandle, RetBuffer, &Node);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     Status = AcpiRsGetCrsMethodData (Node, RetBuffer);
     return_ACPI_STATUS (Status);
 }
 
 ACPI_EXPORT_SYMBOL (AcpiGetCurrentResources)
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiGetPossibleResources
  *
  * PARAMETERS:  DeviceHandle    - Handle to the device object for the
  *                                device we are querying
  *              RetBuffer       - Pointer to a buffer to receive the
  *                                resources for the device
  *
  * RETURN:      Status
  *
  * DESCRIPTION: This function is called to get a list of the possible resources
  *              for a specific device. The caller must first acquire a handle
  *              for the desired device. The resource data is placed in the
  *              buffer pointed to by the RetBuffer variable.
  *
  *              If the function fails an appropriate status will be returned
  *              and the value of RetBuffer is undefined.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiGetPossibleResources (
     ACPI_HANDLE             DeviceHandle,
     ACPI_BUFFER             *RetBuffer)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
 
 
     ACPI_FUNCTION_TRACE (AcpiGetPossibleResources);
 
 
     /* Validate parameters then dispatch to internal routine */
 
     Status = AcpiRsValidateParameters (DeviceHandle, RetBuffer, &Node);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     Status = AcpiRsGetPrsMethodData (Node, RetBuffer);
     return_ACPI_STATUS (Status);
 }
 
 ACPI_EXPORT_SYMBOL (AcpiGetPossibleResources)
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiSetCurrentResources
  *
  * PARAMETERS:  DeviceHandle    - Handle to the device object for the
  *                                device we are setting resources
  *              InBuffer        - Pointer to a buffer containing the
  *                                resources to be set for the device
  *
  * RETURN:      Status
  *
  * DESCRIPTION: This function is called to set the current resources for a
  *              specific device. The caller must first acquire a handle for
  *              the desired device. The resource data is passed to the routine
  *              the buffer pointed to by the InBuffer variable.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiSetCurrentResources (
     ACPI_HANDLE             DeviceHandle,
     ACPI_BUFFER             *InBuffer)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
 
 
     ACPI_FUNCTION_TRACE (AcpiSetCurrentResources);
 
 
     /* Validate the buffer, don't allow zero length */
 
     if ((!InBuffer) ||
         (!InBuffer->Pointer) ||
         (!InBuffer->Length))
     {
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     /* Validate parameters then dispatch to internal routine */
 
     Status = AcpiRsValidateParameters (DeviceHandle, InBuffer, &Node);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     Status = AcpiRsSetSrsMethodData (Node, InBuffer);
     return_ACPI_STATUS (Status);
 }
 
 ACPI_EXPORT_SYMBOL (AcpiSetCurrentResources)
 
 
 /******************************************************************************
  *
  * FUNCTION:    AcpiResourceToAddress64
  *
  * PARAMETERS:  Resource        - Pointer to a resource
  *              Out             - Pointer to the users's return buffer
  *                                (a struct acpi_resource_address64)
  *
  * RETURN:      Status
  *
  * DESCRIPTION: If the resource is an address16, address32, or address64,
  *              copy it to the address64 return buffer. This saves the
  *              caller from having to duplicate code for different-sized
  *              addresses.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiResourceToAddress64 (
     ACPI_RESOURCE               *Resource,
     ACPI_RESOURCE_ADDRESS64     *Out)
 {
     ACPI_RESOURCE_ADDRESS16     *Address16;
     ACPI_RESOURCE_ADDRESS32     *Address32;
 
 
     if (!Resource || !Out)
     {
         return (AE_BAD_PARAMETER);
     }
 
     /* Convert 16 or 32 address descriptor to 64 */
 
     switch (Resource->Type)
     {
     case ACPI_RESOURCE_TYPE_ADDRESS16:
 
         Address16 = ACPI_CAST_PTR (ACPI_RESOURCE_ADDRESS16, &Resource->Data);
         ACPI_COPY_ADDRESS (Out, Address16);
         break;
 
     case ACPI_RESOURCE_TYPE_ADDRESS32:
 
         Address32 = ACPI_CAST_PTR (ACPI_RESOURCE_ADDRESS32, &Resource->Data);
         ACPI_COPY_ADDRESS (Out, Address32);
         break;
 
     case ACPI_RESOURCE_TYPE_ADDRESS64:
 
         /* Simple copy for 64 bit source */
 
         ACPI_MEMCPY (Out, &Resource->Data, sizeof (ACPI_RESOURCE_ADDRESS64));
         break;
 
     default:
         return (AE_BAD_PARAMETER);
     }
 
     return (AE_OK);
 }
 
 ACPI_EXPORT_SYMBOL (AcpiResourceToAddress64)
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiGetVendorResource
  *
  * PARAMETERS:  DeviceHandle    - Handle for the parent device object
  *              Name            - Method name for the parent resource
  *                                (METHOD_NAME__CRS or METHOD_NAME__PRS)
  *              Uuid            - Pointer to the UUID to be matched.
  *                                includes both subtype and 16-byte UUID
  *              RetBuffer       - Where the vendor resource is returned
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Walk a resource template for the specified evice to find a
  *              vendor-defined resource that matches the supplied UUID and
  *              UUID subtype. Returns a ACPI_RESOURCE of type Vendor.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiGetVendorResource (
     ACPI_HANDLE             DeviceHandle,
     char                    *Name,
     ACPI_VENDOR_UUID        *Uuid,
     ACPI_BUFFER             *RetBuffer)
 {
     ACPI_VENDOR_WALK_INFO   Info;
     ACPI_STATUS             Status;
 
 
     /* Other parameters are validated by AcpiWalkResources */
 
     if (!Uuid || !RetBuffer)
     {
         return (AE_BAD_PARAMETER);
     }
 
     Info.Uuid = Uuid;
     Info.Buffer = RetBuffer;
     Info.Status = AE_NOT_EXIST;
 
     /* Walk the _CRS or _PRS resource list for this device */
 
     Status = AcpiWalkResources (DeviceHandle, Name, AcpiRsMatchVendorResource,
                 &Info);
     if (ACPI_FAILURE (Status))
     {
         return (Status);
     }
 
     return (Info.Status);
 }
 
 ACPI_EXPORT_SYMBOL (AcpiGetVendorResource)
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiRsMatchVendorResource
  *
  * PARAMETERS:  ACPI_WALK_RESOURCE_CALLBACK
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Match a vendor resource via the ACPI 3.0 UUID
  *
  ******************************************************************************/
 
 static ACPI_STATUS
 AcpiRsMatchVendorResource (
     ACPI_RESOURCE           *Resource,
     void                    *Context)
 {
     ACPI_VENDOR_WALK_INFO       *Info = Context;
     ACPI_RESOURCE_VENDOR_TYPED  *Vendor;
     ACPI_BUFFER                 *Buffer;
     ACPI_STATUS                 Status;
 
 
     /* Ignore all descriptors except Vendor */
 
     if (Resource->Type != ACPI_RESOURCE_TYPE_VENDOR)
     {
         return (AE_OK);
     }
 
     Vendor = &Resource->Data.VendorTyped;
 
     /*
      * For a valid match, these conditions must hold:
      *
      * 1) Length of descriptor data must be at least as long as a UUID struct
      * 2) The UUID subtypes must match
      * 3) The UUID data must match
      */
     if ((Vendor->ByteLength < (ACPI_UUID_LENGTH + 1)) ||
         (Vendor->UuidSubtype != Info->Uuid->Subtype)  ||
         (ACPI_MEMCMP (Vendor->Uuid, Info->Uuid->Data, ACPI_UUID_LENGTH)))
     {
         return (AE_OK);
     }
 
     /* Validate/Allocate/Clear caller buffer */
 
     Buffer = Info->Buffer;
     Status = AcpiUtInitializeBuffer (Buffer, Resource->Length);
     if (ACPI_FAILURE (Status))
     {
         return (Status);
     }
 
     /* Found the correct resource, copy and return it */
 
     ACPI_MEMCPY (Buffer->Pointer, Resource, Resource->Length);
     Buffer->Length = Resource->Length;
 
     /* Found the desired descriptor, terminate resource walk */
 
     Info->Status = AE_OK;
     return (AE_CTRL_TERMINATE);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiWalkResources
  *
  * PARAMETERS:  DeviceHandle    - Handle to the device object for the
  *                                device we are querying
  *              Name            - Method name of the resources we want
  *                                (METHOD_NAME__CRS or METHOD_NAME__PRS)
  *              UserFunction    - Called for each resource
  *              Context         - Passed to UserFunction
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Retrieves the current or possible resource list for the
  *              specified device. The UserFunction is called once for
  *              each resource in the list.
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiWalkResources (
     ACPI_HANDLE                 DeviceHandle,
     char                        *Name,
     ACPI_WALK_RESOURCE_CALLBACK UserFunction,
     void                        *Context)
 {
     ACPI_STATUS                 Status;
     ACPI_BUFFER                 Buffer;
     ACPI_RESOURCE               *Resource;
     ACPI_RESOURCE               *ResourceEnd;
 
 
     ACPI_FUNCTION_TRACE (AcpiWalkResources);
 
 
     /* Parameter validation */
 
     if (!DeviceHandle || !UserFunction || !Name ||
         (!ACPI_COMPARE_NAME (Name, METHOD_NAME__CRS) &&
          !ACPI_COMPARE_NAME (Name, METHOD_NAME__PRS)))
     {
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     /* Get the _CRS or _PRS resource list */
 
     Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER;
     Status = AcpiRsGetMethodData (DeviceHandle, Name, &Buffer);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     /* Buffer now contains the resource list */
 
     Resource = ACPI_CAST_PTR (ACPI_RESOURCE, Buffer.Pointer);
     ResourceEnd = ACPI_ADD_PTR (ACPI_RESOURCE, Buffer.Pointer, Buffer.Length);
 
     /* Walk the resource list until the EndTag is found (or buffer end) */
 
     while (Resource < ResourceEnd)
     {
         /* Sanity check the resource */
 
         if (Resource->Type > ACPI_RESOURCE_TYPE_MAX)
         {
             Status = AE_AML_INVALID_RESOURCE_TYPE;
             break;
         }
 
         /* Invoke the user function, abort on any error returned */
 
         Status = UserFunction (Resource, Context);
         if (ACPI_FAILURE (Status))
         {
             if (Status == AE_CTRL_TERMINATE)
             {
                 /* This is an OK termination by the user function */
 
                 Status = AE_OK;
             }
             break;
         }
 
         /* EndTag indicates end-of-list */
 
         if (Resource->Type == ACPI_RESOURCE_TYPE_END_TAG)
         {
             break;
         }
 
         /* Get the next resource descriptor */
 
         Resource = ACPI_ADD_PTR (ACPI_RESOURCE, Resource, Resource->Length);
     }
 
     ACPI_FREE (Buffer.Pointer);
     return_ACPI_STATUS (Status);
 }
 
 ACPI_EXPORT_SYMBOL (AcpiWalkResources)