minix/drivers/acpi/executer/exconfig.c
Tomas Hruby 9560b6dea8 ACPI driver
- 99% of the code is Intel's ACPICA. The license is compliant with BSD
  and GNU and virtually all systems that use ACPI use this code, For
  instance it is part of the Linux kernel.

- The only minix specific files are

  acpi.c
  osminixxf.c
  platform/acminix.h

  and

  include/minix/acpi.h

- At the moment the driver does not register interrupt hooks which I
  believe is mainly for handling PnP, events like "battery level is
  low" and power management. Should not be difficult to add it if need
  be.

- The interface to the outside world is virtually non-existent except
  a trivial message based service for PCI driver to query which device
  is connected to what IRQ line. This will evolve as more components
  start using this driver. VM, Scheduler and IOMMU are the possible
  users right now.

- because of dependency on a native 64bit (long long, part of c99) it
  is compiled only with a gnu-like compilers which in case of Minix
  includes gcc llvm-gcc and clang
2010-09-02 15:44:04 +00:00

758 lines
24 KiB
C

/******************************************************************************
*
* Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2010, 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 __EXCONFIG_C__
#include "acpi.h"
#include "accommon.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "actables.h"
#include "acdispat.h"
#include "acevents.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exconfig")
/* Local prototypes */
static ACPI_STATUS
AcpiExAddTable (
UINT32 TableIndex,
ACPI_NAMESPACE_NODE *ParentNode,
ACPI_OPERAND_OBJECT **DdbHandle);
static ACPI_STATUS
AcpiExRegionRead (
ACPI_OPERAND_OBJECT *ObjDesc,
UINT32 Length,
UINT8 *Buffer);
/*******************************************************************************
*
* FUNCTION: AcpiExAddTable
*
* PARAMETERS: Table - Pointer to raw table
* ParentNode - Where to load the table (scope)
* DdbHandle - Where to return the table handle.
*
* RETURN: Status
*
* DESCRIPTION: Common function to Install and Load an ACPI table with a
* returned table handle.
*
******************************************************************************/
static ACPI_STATUS
AcpiExAddTable (
UINT32 TableIndex,
ACPI_NAMESPACE_NODE *ParentNode,
ACPI_OPERAND_OBJECT **DdbHandle)
{
ACPI_OPERAND_OBJECT *ObjDesc;
ACPI_STATUS Status;
ACPI_OWNER_ID OwnerId;
ACPI_FUNCTION_TRACE (ExAddTable);
/* Create an object to be the table handle */
ObjDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE);
if (!ObjDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Init the table handle */
ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID;
ObjDesc->Reference.Class = ACPI_REFCLASS_TABLE;
*DdbHandle = ObjDesc;
/* Install the new table into the local data structures */
ObjDesc->Reference.Value = TableIndex;
/* Add the table to the namespace */
Status = AcpiNsLoadTable (TableIndex, ParentNode);
if (ACPI_FAILURE (Status))
{
AcpiUtRemoveReference (ObjDesc);
*DdbHandle = NULL;
return_ACPI_STATUS (Status);
}
/* Execute any module-level code that was found in the table */
AcpiExExitInterpreter ();
AcpiNsExecModuleCodeList ();
AcpiExEnterInterpreter ();
/* Update GPEs for any new _PRW or _Lxx/_Exx methods. Ignore errors */
Status = AcpiTbGetOwnerId (TableIndex, &OwnerId);
if (ACPI_SUCCESS (Status))
{
AcpiEvUpdateGpes (OwnerId);
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiExLoadTableOp
*
* PARAMETERS: WalkState - Current state with operands
* ReturnDesc - Where to store the return object
*
* RETURN: Status
*
* DESCRIPTION: Load an ACPI table from the RSDT/XSDT
*
******************************************************************************/
ACPI_STATUS
AcpiExLoadTableOp (
ACPI_WALK_STATE *WalkState,
ACPI_OPERAND_OBJECT **ReturnDesc)
{
ACPI_STATUS Status;
ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
ACPI_NAMESPACE_NODE *ParentNode;
ACPI_NAMESPACE_NODE *StartNode;
ACPI_NAMESPACE_NODE *ParameterNode = NULL;
ACPI_OPERAND_OBJECT *DdbHandle;
ACPI_TABLE_HEADER *Table;
UINT32 TableIndex;
ACPI_FUNCTION_TRACE (ExLoadTableOp);
/* Validate lengths for the SignatureString, OEMIDString, OEMTableID */
if ((Operand[0]->String.Length > ACPI_NAME_SIZE) ||
(Operand[1]->String.Length > ACPI_OEM_ID_SIZE) ||
(Operand[2]->String.Length > ACPI_OEM_TABLE_ID_SIZE))
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Find the ACPI table in the RSDT/XSDT */
Status = AcpiTbFindTable (Operand[0]->String.Pointer,
Operand[1]->String.Pointer,
Operand[2]->String.Pointer, &TableIndex);
if (ACPI_FAILURE (Status))
{
if (Status != AE_NOT_FOUND)
{
return_ACPI_STATUS (Status);
}
/* Table not found, return an Integer=0 and AE_OK */
DdbHandle = AcpiUtCreateIntegerObject ((UINT64) 0);
if (!DdbHandle)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
*ReturnDesc = DdbHandle;
return_ACPI_STATUS (AE_OK);
}
/* Default nodes */
StartNode = WalkState->ScopeInfo->Scope.Node;
ParentNode = AcpiGbl_RootNode;
/* RootPath (optional parameter) */
if (Operand[3]->String.Length > 0)
{
/*
* Find the node referenced by the RootPathString. This is the
* location within the namespace where the table will be loaded.
*/
Status = AcpiNsGetNode (StartNode, Operand[3]->String.Pointer,
ACPI_NS_SEARCH_PARENT, &ParentNode);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
/* ParameterPath (optional parameter) */
if (Operand[4]->String.Length > 0)
{
if ((Operand[4]->String.Pointer[0] != '\\') &&
(Operand[4]->String.Pointer[0] != '^'))
{
/*
* Path is not absolute, so it will be relative to the node
* referenced by the RootPathString (or the NS root if omitted)
*/
StartNode = ParentNode;
}
/* Find the node referenced by the ParameterPathString */
Status = AcpiNsGetNode (StartNode, Operand[4]->String.Pointer,
ACPI_NS_SEARCH_PARENT, &ParameterNode);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
/* Load the table into the namespace */
Status = AcpiExAddTable (TableIndex, ParentNode, &DdbHandle);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Parameter Data (optional) */
if (ParameterNode)
{
/* Store the parameter data into the optional parameter object */
Status = AcpiExStore (Operand[5],
ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, ParameterNode),
WalkState);
if (ACPI_FAILURE (Status))
{
(void) AcpiExUnloadTable (DdbHandle);
AcpiUtRemoveReference (DdbHandle);
return_ACPI_STATUS (Status);
}
}
Status = AcpiGetTableByIndex (TableIndex, &Table);
if (ACPI_SUCCESS (Status))
{
ACPI_INFO ((AE_INFO, "Dynamic OEM Table Load:"));
AcpiTbPrintTableHeader (0, Table);
}
/* Invoke table handler if present */
if (AcpiGbl_TableHandler)
{
(void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_LOAD, Table,
AcpiGbl_TableHandlerContext);
}
*ReturnDesc = DdbHandle;
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiExRegionRead
*
* PARAMETERS: ObjDesc - Region descriptor
* Length - Number of bytes to read
* Buffer - Pointer to where to put the data
*
* RETURN: Status
*
* DESCRIPTION: Read data from an operation region. The read starts from the
* beginning of the region.
*
******************************************************************************/
static ACPI_STATUS
AcpiExRegionRead (
ACPI_OPERAND_OBJECT *ObjDesc,
UINT32 Length,
UINT8 *Buffer)
{
ACPI_STATUS Status;
UINT64 Value;
UINT32 RegionOffset = 0;
UINT32 i;
/* Bytewise reads */
for (i = 0; i < Length; i++)
{
Status = AcpiEvAddressSpaceDispatch (ObjDesc, ACPI_READ,
RegionOffset, 8, &Value);
if (ACPI_FAILURE (Status))
{
return (Status);
}
*Buffer = (UINT8) Value;
Buffer++;
RegionOffset++;
}
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiExLoadOp
*
* PARAMETERS: ObjDesc - Region or Buffer/Field where the table will be
* obtained
* Target - Where a handle to the table will be stored
* WalkState - Current state
*
* RETURN: Status
*
* DESCRIPTION: Load an ACPI table from a field or operation region
*
* NOTE: Region Fields (Field, BankField, IndexFields) are resolved to buffer
* objects before this code is reached.
*
* If source is an operation region, it must refer to SystemMemory, as
* per the ACPI specification.
*
******************************************************************************/
ACPI_STATUS
AcpiExLoadOp (
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT *Target,
ACPI_WALK_STATE *WalkState)
{
ACPI_OPERAND_OBJECT *DdbHandle;
ACPI_TABLE_HEADER *Table;
ACPI_TABLE_DESC TableDesc;
UINT32 TableIndex;
ACPI_STATUS Status;
UINT32 Length;
ACPI_FUNCTION_TRACE (ExLoadOp);
ACPI_MEMSET (&TableDesc, 0, sizeof (ACPI_TABLE_DESC));
/* Source Object can be either an OpRegion or a Buffer/Field */
switch (ObjDesc->Common.Type)
{
case ACPI_TYPE_REGION:
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Load table from Region %p\n", ObjDesc));
/* Region must be SystemMemory (from ACPI spec) */
if (ObjDesc->Region.SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY)
{
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
/*
* If the Region Address and Length have not been previously evaluated,
* evaluate them now and save the results.
*/
if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
{
Status = AcpiDsGetRegionArguments (ObjDesc);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
}
/* Get the table header first so we can get the table length */
Table = ACPI_ALLOCATE (sizeof (ACPI_TABLE_HEADER));
if (!Table)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
Status = AcpiExRegionRead (ObjDesc, sizeof (ACPI_TABLE_HEADER),
ACPI_CAST_PTR (UINT8, Table));
Length = Table->Length;
ACPI_FREE (Table);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Must have at least an ACPI table header */
if (Length < sizeof (ACPI_TABLE_HEADER))
{
return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
}
/*
* The original implementation simply mapped the table, with no copy.
* However, the memory region is not guaranteed to remain stable and
* we must copy the table to a local buffer. For example, the memory
* region is corrupted after suspend on some machines. Dynamically
* loaded tables are usually small, so this overhead is minimal.
*
* The latest implementation (5/2009) does not use a mapping at all.
* We use the low-level operation region interface to read the table
* instead of the obvious optimization of using a direct mapping.
* This maintains a consistent use of operation regions across the
* entire subsystem. This is important if additional processing must
* be performed in the (possibly user-installed) operation region
* handler. For example, AcpiExec and ASLTS depend on this.
*/
/* Allocate a buffer for the table */
TableDesc.Pointer = ACPI_ALLOCATE (Length);
if (!TableDesc.Pointer)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Read the entire table */
Status = AcpiExRegionRead (ObjDesc, Length,
ACPI_CAST_PTR (UINT8, TableDesc.Pointer));
if (ACPI_FAILURE (Status))
{
ACPI_FREE (TableDesc.Pointer);
return_ACPI_STATUS (Status);
}
TableDesc.Address = ObjDesc->Region.Address;
break;
case ACPI_TYPE_BUFFER: /* Buffer or resolved RegionField */
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Load table from Buffer or Field %p\n", ObjDesc));
/* Must have at least an ACPI table header */
if (ObjDesc->Buffer.Length < sizeof (ACPI_TABLE_HEADER))
{
return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
}
/* Get the actual table length from the table header */
Table = ACPI_CAST_PTR (ACPI_TABLE_HEADER, ObjDesc->Buffer.Pointer);
Length = Table->Length;
/* Table cannot extend beyond the buffer */
if (Length > ObjDesc->Buffer.Length)
{
return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
}
if (Length < sizeof (ACPI_TABLE_HEADER))
{
return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
}
/*
* Copy the table from the buffer because the buffer could be modified
* or even deleted in the future
*/
TableDesc.Pointer = ACPI_ALLOCATE (Length);
if (!TableDesc.Pointer)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
ACPI_MEMCPY (TableDesc.Pointer, Table, Length);
TableDesc.Address = ACPI_TO_INTEGER (TableDesc.Pointer);
break;
default:
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
/* Validate table checksum (will not get validated in TbAddTable) */
Status = AcpiTbVerifyChecksum (TableDesc.Pointer, Length);
if (ACPI_FAILURE (Status))
{
ACPI_FREE (TableDesc.Pointer);
return_ACPI_STATUS (Status);
}
/* Complete the table descriptor */
TableDesc.Length = Length;
TableDesc.Flags = ACPI_TABLE_ORIGIN_ALLOCATED;
/* Install the new table into the local data structures */
Status = AcpiTbAddTable (&TableDesc, &TableIndex);
if (ACPI_FAILURE (Status))
{
/* Delete allocated table buffer */
AcpiTbDeleteTable (&TableDesc);
return_ACPI_STATUS (Status);
}
/*
* Add the table to the namespace.
*
* Note: Load the table objects relative to the root of the namespace.
* This appears to go against the ACPI specification, but we do it for
* compatibility with other ACPI implementations.
*/
Status = AcpiExAddTable (TableIndex, AcpiGbl_RootNode, &DdbHandle);
if (ACPI_FAILURE (Status))
{
/* On error, TablePtr was deallocated above */
return_ACPI_STATUS (Status);
}
/* Store the DdbHandle into the Target operand */
Status = AcpiExStore (DdbHandle, Target, WalkState);
if (ACPI_FAILURE (Status))
{
(void) AcpiExUnloadTable (DdbHandle);
/* TablePtr was deallocated above */
AcpiUtRemoveReference (DdbHandle);
return_ACPI_STATUS (Status);
}
ACPI_INFO ((AE_INFO, "Dynamic OEM Table Load:"));
AcpiTbPrintTableHeader (0, TableDesc.Pointer);
/* Remove the reference by added by AcpiExStore above */
AcpiUtRemoveReference (DdbHandle);
/* Invoke table handler if present */
if (AcpiGbl_TableHandler)
{
(void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_LOAD, TableDesc.Pointer,
AcpiGbl_TableHandlerContext);
}
return_ACPI_STATUS (Status);
}
/*******************************************************************************
*
* FUNCTION: AcpiExUnloadTable
*
* PARAMETERS: DdbHandle - Handle to a previously loaded table
*
* RETURN: Status
*
* DESCRIPTION: Unload an ACPI table
*
******************************************************************************/
ACPI_STATUS
AcpiExUnloadTable (
ACPI_OPERAND_OBJECT *DdbHandle)
{
ACPI_STATUS Status = AE_OK;
ACPI_OPERAND_OBJECT *TableDesc = DdbHandle;
UINT32 TableIndex;
ACPI_TABLE_HEADER *Table;
ACPI_FUNCTION_TRACE (ExUnloadTable);
/*
* Validate the handle
* Although the handle is partially validated in AcpiExReconfiguration()
* when it calls AcpiExResolveOperands(), the handle is more completely
* validated here.
*
* Handle must be a valid operand object of type reference. Also, the
* DdbHandle must still be marked valid (table has not been previously
* unloaded)
*/
if ((!DdbHandle) ||
(ACPI_GET_DESCRIPTOR_TYPE (DdbHandle) != ACPI_DESC_TYPE_OPERAND) ||
(DdbHandle->Common.Type != ACPI_TYPE_LOCAL_REFERENCE) ||
(!(DdbHandle->Common.Flags & AOPOBJ_DATA_VALID)))
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Get the table index from the DdbHandle */
TableIndex = TableDesc->Reference.Value;
/* Ensure the table is still loaded */
if (!AcpiTbIsTableLoaded (TableIndex))
{
return_ACPI_STATUS (AE_NOT_EXIST);
}
/* Invoke table handler if present */
if (AcpiGbl_TableHandler)
{
Status = AcpiGetTableByIndex (TableIndex, &Table);
if (ACPI_SUCCESS (Status))
{
(void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_UNLOAD, Table,
AcpiGbl_TableHandlerContext);
}
}
/* Delete the portion of the namespace owned by this table */
Status = AcpiTbDeleteNamespaceByOwner (TableIndex);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
(void) AcpiTbReleaseOwnerId (TableIndex);
AcpiTbSetTableLoadedFlag (TableIndex, FALSE);
/*
* Invalidate the handle. We do this because the handle may be stored
* in a named object and may not be actually deleted until much later.
*/
DdbHandle->Common.Flags &= ~AOPOBJ_DATA_VALID;
return_ACPI_STATUS (AE_OK);
}