FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/components/executer/exfield.c

     /******************************************************************************
      *
      * Module Name: exfield - AML execution - FieldUnit read/write
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 1. Copyright Notice
     *
     * Some or all of this work - Copyright (c) 1999 - 2022, 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.
    *
    *****************************************************************************
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * following license:
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    * 1. Redistributions of source code must retain the above copyright
    *    notice, this list of conditions, and the following disclaimer,
    *    without modification.
    * 2. Redistributions in binary form must reproduce at minimum a disclaimer
    *    substantially similar to the "NO WARRANTY" disclaimer below
    *    ("Disclaimer") and any redistribution must be conditioned upon
    *    including a substantially similar Disclaimer requirement for further
    *    binary redistribution.
    * 3. Neither the names of the above-listed copyright holders nor the names
    *    of any contributors may be used to endorse or promote products derived
    *    from this software without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * GNU General Public License ("GPL") version 2 as published by the Free
    * Software Foundation.
    *
    *****************************************************************************/
   
   #include <contrib/dev/acpica/include/acpi.h>
   #include <contrib/dev/acpica/include/accommon.h>
   #include <contrib/dev/acpica/include/acdispat.h>
   #include <contrib/dev/acpica/include/acinterp.h>
   #include <contrib/dev/acpica/include/amlcode.h>
   
   
   #define _COMPONENT          ACPI_EXECUTER
           ACPI_MODULE_NAME    ("exfield")
   
   
   /*
    * This table maps the various Attrib protocols to the byte transfer
    * length. Used for the generic serial bus.
    */
   #define ACPI_INVALID_PROTOCOL_ID        0x80
   #define ACPI_MAX_PROTOCOL_ID            0x0F
   
   static const UINT8      AcpiProtocolLengths[] =
   {
       ACPI_INVALID_PROTOCOL_ID,   /* 0 - reserved */
       ACPI_INVALID_PROTOCOL_ID,   /* 1 - reserved */
       0x00,                       /* 2 - ATTRIB_QUICK */
       ACPI_INVALID_PROTOCOL_ID,   /* 3 - reserved */
       0x01,                       /* 4 - ATTRIB_SEND_RECEIVE */
       ACPI_INVALID_PROTOCOL_ID,   /* 5 - reserved */
       0x01,                       /* 6 - ATTRIB_BYTE */
       ACPI_INVALID_PROTOCOL_ID,   /* 7 - reserved */
       0x02,                       /* 8 - ATTRIB_WORD */
       ACPI_INVALID_PROTOCOL_ID,   /* 9 - reserved */
       0xFF,                       /* A - ATTRIB_BLOCK  */
       0xFF,                       /* B - ATTRIB_BYTES */
       0x02,                       /* C - ATTRIB_PROCESS_CALL */
       0xFF,                       /* D - ATTRIB_BLOCK_PROCESS_CALL */
       0xFF,                       /* E - ATTRIB_RAW_BYTES */
       0xFF                        /* F - ATTRIB_RAW_PROCESS_BYTES */
   };
   
   #define PCC_MASTER_SUBSPACE     3
   
   /*
    * The following macros determine a given offset is a COMD field.
    * According to the specification, generic subspaces (types 0-2) contains a
    * 2-byte COMD field at offset 4 and master subspaces (type 3) contains a 4-byte
    * COMD field starting at offset 12.
    */
   #define GENERIC_SUBSPACE_COMMAND(a)     (4 == a || a == 5)
   #define MASTER_SUBSPACE_COMMAND(a)      (12 <= a && a <= 15)
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiExGetProtocolBufferLength
    *
    * PARAMETERS:  ProtocolId      - The type of the protocol indicated by region
    *                                field access attributes
    *              ReturnLength    - Where the protocol byte transfer length is
    *                                returned
    *
    * RETURN:      Status and decoded byte transfer length
    *
    * DESCRIPTION: This routine returns the length of the GenericSerialBus
    *              protocol bytes
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiExGetProtocolBufferLength (
       UINT32                  ProtocolId,
       UINT32                  *ReturnLength)
   {
   
       if ((ProtocolId > ACPI_MAX_PROTOCOL_ID) ||
           (AcpiProtocolLengths[ProtocolId] == ACPI_INVALID_PROTOCOL_ID))
       {
           ACPI_ERROR ((AE_INFO,
               "Invalid Field/AccessAs protocol ID: 0x%4.4X", ProtocolId));
   
           return (AE_AML_PROTOCOL);
       }
   
       *ReturnLength = AcpiProtocolLengths[ProtocolId];
       return (AE_OK);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiExReadDataFromField
    *
    * PARAMETERS:  WalkState           - Current execution state
    *              ObjDesc             - The named field
    *              RetBufferDesc       - Where the return data object is stored
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Read from a named field. Returns either an Integer or a
    *              Buffer, depending on the size of the field and whether if a
    *              field is created by the CreateField() operator.
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiExReadDataFromField (
       ACPI_WALK_STATE         *WalkState,
       ACPI_OPERAND_OBJECT     *ObjDesc,
       ACPI_OPERAND_OBJECT     **RetBufferDesc)
   {
       ACPI_STATUS             Status;
       ACPI_OPERAND_OBJECT     *BufferDesc;
       void                    *Buffer;
       UINT32                  BufferLength;
   
   
       ACPI_FUNCTION_TRACE_PTR (ExReadDataFromField, ObjDesc);
   
   
       /* Parameter validation */
   
       if (!ObjDesc)
       {
           return_ACPI_STATUS (AE_AML_NO_OPERAND);
       }
       if (!RetBufferDesc)
       {
           return_ACPI_STATUS (AE_BAD_PARAMETER);
       }
   
       if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
       {
           /*
            * If the BufferField arguments have not been previously evaluated,
            * evaluate them now and save the results.
            */
           if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
           {
               Status = AcpiDsGetBufferFieldArguments (ObjDesc);
               if (ACPI_FAILURE (Status))
               {
                   return_ACPI_STATUS (Status);
               }
           }
       }
       else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
           (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
            ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
            ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI  ||
            ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_RT ||
            ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_FIXED_HARDWARE))
       {
           /* SMBus, GSBus, IPMI serial */
   
           Status = AcpiExReadSerialBus (ObjDesc, RetBufferDesc);
           return_ACPI_STATUS (Status);
       }
   
       /*
        * Allocate a buffer for the contents of the field.
        *
        * If the field is larger than the current integer width, create
        * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
        * the use of arithmetic operators on the returned value if the
        * field size is equal or smaller than an Integer.
        *
        * However, all buffer fields created by CreateField operator needs to
        * remain as a buffer to match other AML interpreter implementations.
        *
        * Note: Field.length is in bits.
        */
       BufferLength = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (
           ObjDesc->Field.BitLength);
   
       if (BufferLength > AcpiGbl_IntegerByteWidth ||
           (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD &&
           ObjDesc->BufferField.IsCreateField))
       {
           /* Field is too large for an Integer, create a Buffer instead */
   
           BufferDesc = AcpiUtCreateBufferObject (BufferLength);
           if (!BufferDesc)
           {
               return_ACPI_STATUS (AE_NO_MEMORY);
           }
           Buffer = BufferDesc->Buffer.Pointer;
       }
       else
       {
           /* Field will fit within an Integer (normal case) */
   
           BufferDesc = AcpiUtCreateIntegerObject ((UINT64) 0);
           if (!BufferDesc)
           {
               return_ACPI_STATUS (AE_NO_MEMORY);
           }
   
           BufferLength = AcpiGbl_IntegerByteWidth;
           Buffer = &BufferDesc->Integer.Value;
       }
   
       if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
           (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GPIO))
       {
           /* General Purpose I/O */
   
           Status = AcpiExReadGpio (ObjDesc, Buffer);
           goto Exit;
       }
       else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
           (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_COMM))
       {
           /*
            * Reading from a PCC field unit does not require the handler because
            * it only requires reading from the InternalPccBuffer.
            */
           ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
               "PCC FieldRead bits %u\n", ObjDesc->Field.BitLength));
   
           memcpy (Buffer, ObjDesc->Field.RegionObj->Field.InternalPccBuffer +
           ObjDesc->Field.BaseByteOffset, (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (
               ObjDesc->Field.BitLength));
   
           *RetBufferDesc = BufferDesc;
           return AE_OK;
       }
   
       ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
           "FieldRead [TO]:   Obj %p, Type %X, Buf %p, ByteLen %X\n",
           ObjDesc, ObjDesc->Common.Type, Buffer, BufferLength));
       ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
           "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
           ObjDesc->CommonField.BitLength,
           ObjDesc->CommonField.StartFieldBitOffset,
           ObjDesc->CommonField.BaseByteOffset));
   
       /* Lock entire transaction if requested */
   
       AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
   
       /* Read from the field */
   
       Status = AcpiExExtractFromField (ObjDesc, Buffer, BufferLength);
       AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
   
   
   Exit:
       if (ACPI_FAILURE (Status))
       {
           AcpiUtRemoveReference (BufferDesc);
       }
       else
       {
           *RetBufferDesc = BufferDesc;
       }
   
       return_ACPI_STATUS (Status);
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    AcpiExWriteDataToField
    *
    * PARAMETERS:  SourceDesc          - Contains data to write
    *              ObjDesc             - The named field
    *              ResultDesc          - Where the return value is returned, if any
    *
    * RETURN:      Status
    *
    * DESCRIPTION: Write to a named field
    *
    ******************************************************************************/
   
   ACPI_STATUS
   AcpiExWriteDataToField (
       ACPI_OPERAND_OBJECT     *SourceDesc,
       ACPI_OPERAND_OBJECT     *ObjDesc,
       ACPI_OPERAND_OBJECT     **ResultDesc)
   {
       ACPI_STATUS             Status;
       UINT32                  BufferLength;
       UINT32                  DataLength;
       void                    *Buffer;
   
   
       ACPI_FUNCTION_TRACE_PTR (ExWriteDataToField, ObjDesc);
   
   
       /* Parameter validation */
   
       if (!SourceDesc || !ObjDesc)
       {
           return_ACPI_STATUS (AE_AML_NO_OPERAND);
       }
   
       if (ObjDesc->Common.Type == ACPI_TYPE_BUFFER_FIELD)
       {
           /*
            * If the BufferField arguments have not been previously evaluated,
            * evaluate them now and save the results.
            */
           if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
           {
               Status = AcpiDsGetBufferFieldArguments (ObjDesc);
               if (ACPI_FAILURE (Status))
               {
                   return_ACPI_STATUS (Status);
               }
           }
       }
       else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
           (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GPIO))
       {
           /* General Purpose I/O */
   
           Status = AcpiExWriteGpio (SourceDesc, ObjDesc, ResultDesc);
           return_ACPI_STATUS (Status);
       }
       else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
           (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_SMBUS ||
            ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS ||
            ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_IPMI  ||
            ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_RT ||
            ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_FIXED_HARDWARE))
       {
           /* SMBus, GSBus, IPMI serial */
   
           Status = AcpiExWriteSerialBus (SourceDesc, ObjDesc, ResultDesc);
           return_ACPI_STATUS (Status);
       }
       else if ((ObjDesc->Common.Type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
                (ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_COMM))
       {
           /*
            * According to the spec a write to the COMD field will invoke the
            * region handler. Otherwise, write to the PccInternal buffer. This
            * implementation will use the offsets specified rather than the name
            * of the field. This is considered safer because some firmware tools
            * are known to obfiscate named objects.
            */
           DataLength = (ACPI_SIZE) ACPI_ROUND_BITS_UP_TO_BYTES (
               ObjDesc->Field.BitLength);
           memcpy (ObjDesc->Field.RegionObj->Field.InternalPccBuffer +
               ObjDesc->Field.BaseByteOffset,
               SourceDesc->Buffer.Pointer, DataLength);
   
           if (MASTER_SUBSPACE_COMMAND (ObjDesc->Field.BaseByteOffset))
           {
               /* Perform the write */
   
               ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                   "PCC COMD field has been written. Invoking PCC handler now.\n"));
   
               Status = AcpiExAccessRegion (
                   ObjDesc, 0, (UINT64 *) ObjDesc->Field.RegionObj->Field.InternalPccBuffer,
                   ACPI_WRITE);
               return_ACPI_STATUS (Status);
           }
           return (AE_OK);
       }
   
   
       /* Get a pointer to the data to be written */
   
       switch (SourceDesc->Common.Type)
       {
       case ACPI_TYPE_INTEGER:
   
           Buffer = &SourceDesc->Integer.Value;
           BufferLength = sizeof (SourceDesc->Integer.Value);
           break;
   
       case ACPI_TYPE_BUFFER:
   
           Buffer = SourceDesc->Buffer.Pointer;
           BufferLength = SourceDesc->Buffer.Length;
           break;
   
       case ACPI_TYPE_STRING:
   
           Buffer = SourceDesc->String.Pointer;
           BufferLength = SourceDesc->String.Length;
           break;
   
       default:
           return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
       }
   
       ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
           "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
           SourceDesc, AcpiUtGetTypeName (SourceDesc->Common.Type),
           SourceDesc->Common.Type, Buffer, BufferLength));
   
       ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
           "FieldWrite [TO]:   Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
           ObjDesc, AcpiUtGetTypeName (ObjDesc->Common.Type),
           ObjDesc->Common.Type,
           ObjDesc->CommonField.BitLength,
           ObjDesc->CommonField.StartFieldBitOffset,
           ObjDesc->CommonField.BaseByteOffset));
   
       /* Lock entire transaction if requested */
   
       AcpiExAcquireGlobalLock (ObjDesc->CommonField.FieldFlags);
   
       /* Write to the field */
   
       Status = AcpiExInsertIntoField (ObjDesc, Buffer, BufferLength);
       AcpiExReleaseGlobalLock (ObjDesc->CommonField.FieldFlags);
       return_ACPI_STATUS (Status);
   }

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