path: root/sys/contrib/dev/acpica/tbconvrt.c

/******************************************************************************
 *
 * Module Name: tbconvrt - ACPI Table conversion utilities
 *              $Revision: 57 $
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2004, 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 __TBCONVRT_C__

#include "acpi.h"
#include "actables.h"


#define _COMPONENT          ACPI_TABLES
        ACPI_MODULE_NAME    ("tbconvrt")


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbGetTableCount
 *
 * PARAMETERS:  RSDP            - Pointer to the RSDP
 *              RSDT            - Pointer to the RSDT/XSDT
 *
 * RETURN:      The number of tables pointed to by the RSDT or XSDT.
 *
 * DESCRIPTION: Calculate the number of tables.  Automatically handles either
 *              an RSDT or XSDT.
 *
 ******************************************************************************/

UINT32
AcpiTbGetTableCount (
    RSDP_DESCRIPTOR         *RSDP,
    ACPI_TABLE_HEADER       *RSDT)
{
    UINT32                  PointerSize;


    ACPI_FUNCTION_ENTRY ();


    if (RSDP->Revision < 2)
    {
        PointerSize = sizeof (UINT32);
    }
    else
    {
        PointerSize = sizeof (UINT64);
    }

    /*
     * Determine the number of tables pointed to by the RSDT/XSDT.
     * This is defined by the ACPI Specification to be the number of
     * pointers contained within the RSDT/XSDT.  The size of the pointers
     * is architecture-dependent.
     */
    return ((RSDT->Length - sizeof (ACPI_TABLE_HEADER)) / PointerSize);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbConvertToXsdt
 *
 * PARAMETERS:  TableInfo       - Info about the RSDT
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert an RSDT to an XSDT (internal common format)
 *
 ******************************************************************************/

ACPI_STATUS
AcpiTbConvertToXsdt (
    ACPI_TABLE_DESC         *TableInfo)
{
    ACPI_SIZE               TableSize;
    UINT32                  i;
    XSDT_DESCRIPTOR         *NewTable;


    ACPI_FUNCTION_ENTRY ();


    /* Compute size of the converted XSDT */

    TableSize = ((ACPI_SIZE) AcpiGbl_RsdtTableCount * sizeof (UINT64)) +
                    sizeof (ACPI_TABLE_HEADER);

    /* Allocate an XSDT */

    NewTable = ACPI_MEM_CALLOCATE (TableSize);
    if (!NewTable)
    {
        return (AE_NO_MEMORY);
    }

    /* Copy the header and set the length */

    ACPI_MEMCPY (NewTable, TableInfo->Pointer, sizeof (ACPI_TABLE_HEADER));
    NewTable->Length = (UINT32) TableSize;

    /* Copy the table pointers */

    for (i = 0; i < AcpiGbl_RsdtTableCount; i++)
    {
        if (AcpiGbl_RSDP->Revision < 2)
        {
            ACPI_STORE_ADDRESS (NewTable->TableOffsetEntry[i],
                (ACPI_CAST_PTR (RSDT_DESCRIPTOR_REV1, TableInfo->Pointer))->TableOffsetEntry[i]);
        }
        else
        {
            NewTable->TableOffsetEntry[i] =
                (ACPI_CAST_PTR (XSDT_DESCRIPTOR, TableInfo->Pointer))->TableOffsetEntry[i];
        }
    }

    /* Delete the original table (either mapped or in a buffer) */

    AcpiTbDeleteSingleTable (TableInfo);

    /* Point the table descriptor to the new table */

    TableInfo->Pointer      = ACPI_CAST_PTR (ACPI_TABLE_HEADER, NewTable);
    TableInfo->Length       = TableSize;
    TableInfo->Allocation   = ACPI_MEM_ALLOCATED;

    return (AE_OK);
}


/******************************************************************************
 *
 * FUNCTION:    AcpiTbInitGenericAddress
 *
 * PARAMETERS:  NewGasStruct        - GAS struct to be initialized
 *              RegisterBitWidth    - Width of this register
 *              Address             - Address of the register
 *
 * RETURN:      None
 *
 * DESCRIPTION: Initialize a GAS structure.
 *
 ******************************************************************************/

static void
AcpiTbInitGenericAddress (
    ACPI_GENERIC_ADDRESS    *NewGasStruct,
    UINT8                   RegisterBitWidth,
    ACPI_PHYSICAL_ADDRESS   Address)
{

    ACPI_STORE_ADDRESS (NewGasStruct->Address, Address);

    NewGasStruct->AddressSpaceId    = ACPI_ADR_SPACE_SYSTEM_IO;
    NewGasStruct->RegisterBitWidth  = RegisterBitWidth;
    NewGasStruct->RegisterBitOffset = 0;
    NewGasStruct->Reserved          = 0;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbConvertFadt1
 *
 * PARAMETERS:  LocalFadt       - Pointer to new FADT
 *              OriginalFadt    - Pointer to old FADT
 *
 * RETURN:      Populates LocalFadt
 *
 * DESCRIPTION: Convert an ACPI 1.0 FADT to common internal format
 *
 ******************************************************************************/

static void
AcpiTbConvertFadt1 (
    FADT_DESCRIPTOR_REV2   *LocalFadt,
    FADT_DESCRIPTOR_REV1   *OriginalFadt)
{


    /* ACPI 1.0 FACS */
    /* The BIOS stored FADT should agree with Revision 1.0 */

    /*
     * Copy the table header and the common part of the tables.
     *
     * The 2.0 table is an extension of the 1.0 table, so the entire 1.0
     * table can be copied first, then expand some fields to 64 bits.
     */
    ACPI_MEMCPY (LocalFadt, OriginalFadt, sizeof (FADT_DESCRIPTOR_REV1));

    /* Convert table pointers to 64-bit fields */

    ACPI_STORE_ADDRESS (LocalFadt->XFirmwareCtrl, LocalFadt->V1_FirmwareCtrl);
    ACPI_STORE_ADDRESS (LocalFadt->XDsdt, LocalFadt->V1_Dsdt);

    /*
     * System Interrupt Model isn't used in ACPI 2.0 (LocalFadt->Reserved1 = 0;)
     */

    /*
     * This field is set by the OEM to convey the preferred power management
     * profile to OSPM. It doesn't have any 1.0 equivalence.  Since we don't
     * know what kind of 32-bit system this is, we will use "unspecified".
     */
    LocalFadt->Prefer_PM_Profile = PM_UNSPECIFIED;

    /*
     * Processor Performance State Control. This is the value OSPM writes to
     * the SMI_CMD register to assume processor performance state control
     * responsibility. There isn't any equivalence in 1.0, leave it zeroed.
     */
    LocalFadt->PstateCnt = 0;

    /*
     * Support for the _CST object and C States change notification.
     * This data item hasn't any 1.0 equivalence so leave it zero.
     */
    LocalFadt->CstCnt = 0;

    /*
     * FADT Rev 2 was an interim FADT released between ACPI 1.0 and ACPI 2.0.
     * It primarily adds the FADT reset mechanism.
     */
    if ((OriginalFadt->Revision == 2) &&
        (OriginalFadt->Length == sizeof (FADT_DESCRIPTOR_REV2_MINUS)))
    {
        /*
         * Grab the entire generic address struct, plus the 1-byte reset value
         * that immediately follows.
         */
        ACPI_MEMCPY (&LocalFadt->ResetRegister,
            &((FADT_DESCRIPTOR_REV2_MINUS *) OriginalFadt)->ResetRegister,
            sizeof (ACPI_GENERIC_ADDRESS) + 1);
    }
    else
    {
        /*
         * Since there isn't any equivalence in 1.0 and since it is highly
         * likely that a 1.0 system has legacy support.
         */
        LocalFadt->IapcBootArch = BAF_LEGACY_DEVICES;
    }

    /*
     * Convert the V1.0 block addresses to V2.0 GAS structures
     */
    AcpiTbInitGenericAddress (&LocalFadt->XPm1aEvtBlk, LocalFadt->Pm1EvtLen,
                             (ACPI_PHYSICAL_ADDRESS)   LocalFadt->V1_Pm1aEvtBlk);
    AcpiTbInitGenericAddress (&LocalFadt->XPm1bEvtBlk, LocalFadt->Pm1EvtLen,
                             (ACPI_PHYSICAL_ADDRESS)   LocalFadt->V1_Pm1bEvtBlk);
    AcpiTbInitGenericAddress (&LocalFadt->XPm1aCntBlk, LocalFadt->Pm1CntLen,
                             (ACPI_PHYSICAL_ADDRESS)   LocalFadt->V1_Pm1aCntBlk);
    AcpiTbInitGenericAddress (&LocalFadt->XPm1bCntBlk, LocalFadt->Pm1CntLen,
                             (ACPI_PHYSICAL_ADDRESS)   LocalFadt->V1_Pm1bCntBlk);
    AcpiTbInitGenericAddress (&LocalFadt->XPm2CntBlk,  LocalFadt->Pm2CntLen,
                             (ACPI_PHYSICAL_ADDRESS)   LocalFadt->V1_Pm2CntBlk);
    AcpiTbInitGenericAddress (&LocalFadt->XPmTmrBlk,   LocalFadt->PmTmLen,
                             (ACPI_PHYSICAL_ADDRESS)   LocalFadt->V1_PmTmrBlk);
    AcpiTbInitGenericAddress (&LocalFadt->XGpe0Blk,    0,
                             (ACPI_PHYSICAL_ADDRESS)   LocalFadt->V1_Gpe0Blk);
    AcpiTbInitGenericAddress (&LocalFadt->XGpe1Blk,    0,
                             (ACPI_PHYSICAL_ADDRESS)   LocalFadt->V1_Gpe1Blk);

    /* Create separate GAS structs for the PM1 Enable registers */

    AcpiTbInitGenericAddress (&AcpiGbl_XPm1aEnable,
         (UINT8) ACPI_DIV_2 (AcpiGbl_FADT->Pm1EvtLen),
         (ACPI_PHYSICAL_ADDRESS) (ACPI_GET_ADDRESS (LocalFadt->XPm1aEvtBlk.Address) +
            ACPI_DIV_2 (AcpiGbl_FADT->Pm1EvtLen)));

    /* PM1B is optional; leave null if not present */

    if (ACPI_GET_ADDRESS (LocalFadt->XPm1bEvtBlk.Address))
    {
        AcpiTbInitGenericAddress (&AcpiGbl_XPm1bEnable,
             (UINT8) ACPI_DIV_2 (AcpiGbl_FADT->Pm1EvtLen),
             (ACPI_PHYSICAL_ADDRESS) (ACPI_GET_ADDRESS (LocalFadt->XPm1bEvtBlk.Address) +
                ACPI_DIV_2 (AcpiGbl_FADT->Pm1EvtLen)));
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbConvertFadt2
 *
 * PARAMETERS:  LocalFadt       - Pointer to new FADT
 *              OriginalFadt    - Pointer to old FADT
 *
 * RETURN:      Populates LocalFadt
 *
 * DESCRIPTION: Convert an ACPI 2.0 FADT to common internal format.
 *              Handles optional "X" fields.
 *
 ******************************************************************************/

static void
AcpiTbConvertFadt2 (
    FADT_DESCRIPTOR_REV2   *LocalFadt,
    FADT_DESCRIPTOR_REV2   *OriginalFadt)
{

    /* We have an ACPI 2.0 FADT but we must copy it to our local buffer */

    ACPI_MEMCPY (LocalFadt, OriginalFadt, sizeof (FADT_DESCRIPTOR_REV2));

    /*
     * "X" fields are optional extensions to the original V1.0 fields, so
     * we must selectively expand V1.0 fields if the corresponding X field
     * is zero.
     */
    if (!(ACPI_GET_ADDRESS (LocalFadt->XFirmwareCtrl)))
    {
        ACPI_STORE_ADDRESS (LocalFadt->XFirmwareCtrl, LocalFadt->V1_FirmwareCtrl);
    }

    if (!(ACPI_GET_ADDRESS (LocalFadt->XDsdt)))
    {
        ACPI_STORE_ADDRESS (LocalFadt->XDsdt, LocalFadt->V1_Dsdt);
    }

    if (!(ACPI_GET_ADDRESS (LocalFadt->XPm1aEvtBlk.Address)))
    {
        AcpiTbInitGenericAddress (&LocalFadt->XPm1aEvtBlk,
            LocalFadt->Pm1EvtLen, (ACPI_PHYSICAL_ADDRESS) LocalFadt->V1_Pm1aEvtBlk);
    }

    if (!(ACPI_GET_ADDRESS (LocalFadt->XPm1bEvtBlk.Address)))
    {
        AcpiTbInitGenericAddress (&LocalFadt->XPm1bEvtBlk,
            LocalFadt->Pm1EvtLen, (ACPI_PHYSICAL_ADDRESS) LocalFadt->V1_Pm1bEvtBlk);
    }

    if (!(ACPI_GET_ADDRESS (LocalFadt->XPm1aCntBlk.Address)))
    {
        AcpiTbInitGenericAddress (&LocalFadt->XPm1aCntBlk,
            LocalFadt->Pm1CntLen, (ACPI_PHYSICAL_ADDRESS) LocalFadt->V1_Pm1aCntBlk);
    }

    if (!(ACPI_GET_ADDRESS (LocalFadt->XPm1bCntBlk.Address)))
    {
        AcpiTbInitGenericAddress (&LocalFadt->XPm1bCntBlk,
            LocalFadt->Pm1CntLen, (ACPI_PHYSICAL_ADDRESS) LocalFadt->V1_Pm1bCntBlk);
    }

    if (!(ACPI_GET_ADDRESS (LocalFadt->XPm2CntBlk.Address)))
    {
        AcpiTbInitGenericAddress (&LocalFadt->XPm2CntBlk,
            LocalFadt->Pm2CntLen, (ACPI_PHYSICAL_ADDRESS) LocalFadt->V1_Pm2CntBlk);
    }

    if (!(ACPI_GET_ADDRESS (LocalFadt->XPmTmrBlk.Address)))
    {
        AcpiTbInitGenericAddress (&LocalFadt->XPmTmrBlk,
            LocalFadt->PmTmLen, (ACPI_PHYSICAL_ADDRESS) LocalFadt->V1_PmTmrBlk);
    }

    if (!(ACPI_GET_ADDRESS (LocalFadt->XGpe0Blk.Address)))
    {
        AcpiTbInitGenericAddress (&LocalFadt->XGpe0Blk,
            0, (ACPI_PHYSICAL_ADDRESS) LocalFadt->V1_Gpe0Blk);
    }

    if (!(ACPI_GET_ADDRESS (LocalFadt->XGpe1Blk.Address)))
    {
        AcpiTbInitGenericAddress (&LocalFadt->XGpe1Blk,
            0, (ACPI_PHYSICAL_ADDRESS) LocalFadt->V1_Gpe1Blk);
    }

    /* Create separate GAS structs for the PM1 Enable registers */

    AcpiTbInitGenericAddress (&AcpiGbl_XPm1aEnable,
        (UINT8) ACPI_DIV_2 (AcpiGbl_FADT->Pm1EvtLen),
        (ACPI_PHYSICAL_ADDRESS) (ACPI_GET_ADDRESS (LocalFadt->XPm1aEvtBlk.Address) +
            ACPI_DIV_2 (AcpiGbl_FADT->Pm1EvtLen)));
    AcpiGbl_XPm1aEnable.AddressSpaceId  = LocalFadt->XPm1aEvtBlk.AddressSpaceId;

    /* PM1B is optional; leave null if not present */

    if (ACPI_GET_ADDRESS (LocalFadt->XPm1bEvtBlk.Address))
    {
        AcpiTbInitGenericAddress (&AcpiGbl_XPm1bEnable,
            (UINT8) ACPI_DIV_2 (AcpiGbl_FADT->Pm1EvtLen),
            (ACPI_PHYSICAL_ADDRESS) (ACPI_GET_ADDRESS (LocalFadt->XPm1bEvtBlk.Address) +
                ACPI_DIV_2 (AcpiGbl_FADT->Pm1EvtLen)));
        AcpiGbl_XPm1bEnable.AddressSpaceId  = LocalFadt->XPm1bEvtBlk.AddressSpaceId;
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbConvertTableFadt
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Converts a BIOS supplied ACPI 1.0 FADT to a local
 *              ACPI 2.0 FADT. If the BIOS supplied a 2.0 FADT then it is simply
 *              copied to the local FADT.  The ACPI CA software uses this
 *              local FADT. Thus a significant amount of special #ifdef
 *              type codeing is saved.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiTbConvertTableFadt (void)
{
    FADT_DESCRIPTOR_REV2   *LocalFadt;
    ACPI_TABLE_DESC        *TableDesc;


    ACPI_FUNCTION_TRACE ("TbConvertTableFadt");


    /*
     * AcpiGbl_FADT is valid. Validate the FADT length. The table must be
     * at least as long as the version 1.0 FADT
     */
    if (AcpiGbl_FADT->Length < sizeof (FADT_DESCRIPTOR_REV1))
    {
        ACPI_REPORT_ERROR (("FADT is invalid, too short: 0x%X\n", AcpiGbl_FADT->Length));
        return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
    }

    /* Allocate buffer for the ACPI 2.0(+) FADT */

    LocalFadt = ACPI_MEM_CALLOCATE (sizeof (FADT_DESCRIPTOR_REV2));
    if (!LocalFadt)
    {
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    if (AcpiGbl_FADT->Revision >= FADT2_REVISION_ID)
    {
        if (AcpiGbl_FADT->Length < sizeof (FADT_DESCRIPTOR_REV2))
        {
            /* Length is too short to be a V2.0 table */

            ACPI_REPORT_WARNING (("Inconsistent FADT length (0x%X) and revision (0x%X), using FADT V1.0 portion of table\n",
                        AcpiGbl_FADT->Length, AcpiGbl_FADT->Revision));

            AcpiTbConvertFadt1 (LocalFadt, (void *) AcpiGbl_FADT);
        }
        else
        {
            /* Valid V2.0 table */

            AcpiTbConvertFadt2 (LocalFadt, AcpiGbl_FADT);
        }
    }
    else
    {
        /* Valid V1.0 table */

        AcpiTbConvertFadt1 (LocalFadt, (void *) AcpiGbl_FADT);
    }

    /*
     * Global FADT pointer will point to the new common V2.0 FADT
     */
    AcpiGbl_FADT = LocalFadt;
    AcpiGbl_FADT->Length = sizeof (FADT_DESCRIPTOR);

    /* Free the original table */

    TableDesc = AcpiGbl_TableLists[ACPI_TABLE_FADT].Next;
    AcpiTbDeleteSingleTable (TableDesc);

    /* Install the new table */

    TableDesc->Pointer      = ACPI_CAST_PTR (ACPI_TABLE_HEADER, AcpiGbl_FADT);
    TableDesc->Allocation   = ACPI_MEM_ALLOCATED;
    TableDesc->Length       = sizeof (FADT_DESCRIPTOR_REV2);

    /* Dump the entire FADT */

    ACPI_DEBUG_PRINT ((ACPI_DB_TABLES,
        "Hex dump of common internal FADT, size %d (%X)\n",
        AcpiGbl_FADT->Length, AcpiGbl_FADT->Length));
    ACPI_DUMP_BUFFER ((UINT8 *) (AcpiGbl_FADT), AcpiGbl_FADT->Length);

    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiTbConvertTableFacs
 *
 * PARAMETERS:  TableInfo       - Info for currently installad FACS
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert ACPI 1.0 and ACPI 2.0 FACS to a common internal
 *              table format.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiTbBuildCommonFacs (
    ACPI_TABLE_DESC         *TableInfo)
{

    ACPI_FUNCTION_TRACE ("TbBuildCommonFacs");


    /* Absolute minimum length is 24, but the ACPI spec says 64 */

    if (AcpiGbl_FACS->Length < 24)
    {
        ACPI_REPORT_ERROR (("Invalid FACS table length: 0x%X\n", AcpiGbl_FACS->Length));
        return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
    }

    if (AcpiGbl_FACS->Length < 64)
    {
        ACPI_REPORT_WARNING (("FACS is shorter than the ACPI specification allows: 0x%X, using anyway\n",
            AcpiGbl_FACS->Length));
    }

    /* Copy fields to the new FACS */

    AcpiGbl_CommonFACS.GlobalLock = &(AcpiGbl_FACS->GlobalLock);

    if ((AcpiGbl_RSDP->Revision < 2) ||
        (AcpiGbl_FACS->Length < 32)  ||
        (!(ACPI_GET_ADDRESS (AcpiGbl_FACS->XFirmwareWakingVector))))
    {
        /* ACPI 1.0 FACS or short table or optional X_ field is zero */

        AcpiGbl_CommonFACS.FirmwareWakingVector = ACPI_CAST_PTR (UINT64, &(AcpiGbl_FACS->FirmwareWakingVector));
        AcpiGbl_CommonFACS.VectorWidth = 32;
    }
    else
    {
        /* ACPI 2.0 FACS with valid X_ field */

        AcpiGbl_CommonFACS.FirmwareWakingVector = &AcpiGbl_FACS->XFirmwareWakingVector;
        AcpiGbl_CommonFACS.VectorWidth = 64;
    }

    return_ACPI_STATUS (AE_OK);
}