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/******************************************************************************

 *

 * Module Name: tbutils   - table utilities

 *

 *****************************************************************************/

/******************************************************************************

 *

 * 1. Copyright Notice

 *

 * Some or all of this work - Copyright (c) 1999 - 2011, 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 __TBUTILS_C__

#include "acpi.h"

#include "accommon.h"

#include "actables.h"

#define _COMPONENT          ACPI_TABLES

        ACPI_MODULE_NAME    ("tbutils")

/* Local prototypes */

static void

AcpiTbFixString (

    char                    *String,

    ACPI_SIZE               Length);

static void

AcpiTbCleanupTableHeader (

    ACPI_TABLE_HEADER       *OutHeader,

    ACPI_TABLE_HEADER       *Header);

static ACPI_PHYSICAL_ADDRESS

AcpiTbGetRootTableEntry (

    UINT8                   *TableEntry,

    UINT32                  TableEntrySize);

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbInitializeFacs

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global

 *              for accessing the Global Lock and Firmware Waking Vector

 *

 ******************************************************************************/

ACPI_STATUS

AcpiTbInitializeFacs (

    void)

{

    ACPI_STATUS             Status;

    Status = AcpiGetTableByIndex (ACPI_TABLE_INDEX_FACS,

                ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &AcpiGbl_FACS));

    return (Status);

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbTablesLoaded

 *

 * PARAMETERS:  None

 *

 * RETURN:      TRUE if required ACPI tables are loaded

 *

 * DESCRIPTION: Determine if the minimum required ACPI tables are present

 *              (FADT, FACS, DSDT)

 *

 ******************************************************************************/

BOOLEAN

AcpiTbTablesLoaded (

    void)

{

    if (AcpiGbl_RootTableList.CurrentTableCount >= 3)

    {

        return (TRUE);

    }

    return (FALSE);

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbFixString

 *

 * PARAMETERS:  String              - String to be repaired

 *              Length              - Maximum length

 *

 * RETURN:      None

 *

 * DESCRIPTION: Replace every non-printable or non-ascii byte in the string

 *              with a question mark '?'.

 *

 ******************************************************************************/

static void

AcpiTbFixString (

    char                    *String,

    ACPI_SIZE               Length)

{

    while (Length && *String)

    {

        if (!ACPI_IS_PRINT (*String))

        {

            *String = '?';

        }

        String++;

        Length--;

    }

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbCleanupTableHeader

 *

 * PARAMETERS:  OutHeader           - Where the cleaned header is returned

 *              Header              - Input ACPI table header

 *

 * RETURN:      Returns the cleaned header in OutHeader

 *

 * DESCRIPTION: Copy the table header and ensure that all "string" fields in

 *              the header consist of printable characters.

 *

 ******************************************************************************/

static void

AcpiTbCleanupTableHeader (

    ACPI_TABLE_HEADER       *OutHeader,

    ACPI_TABLE_HEADER       *Header)

{

    ACPI_MEMCPY (OutHeader, Header, sizeof (ACPI_TABLE_HEADER));

    AcpiTbFixString (OutHeader->Signature, ACPI_NAME_SIZE);

    AcpiTbFixString (OutHeader->OemId, ACPI_OEM_ID_SIZE);

    AcpiTbFixString (OutHeader->OemTableId, ACPI_OEM_TABLE_ID_SIZE);

    AcpiTbFixString (OutHeader->AslCompilerId, ACPI_NAME_SIZE);

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbPrintTableHeader

 *

 * PARAMETERS:  Address             - Table physical address

 *              Header              - Table header

 *

 * RETURN:      None

 *

 * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.

 *

 ******************************************************************************/

void

AcpiTbPrintTableHeader (

    ACPI_PHYSICAL_ADDRESS   Address,

    ACPI_TABLE_HEADER       *Header)

{

    ACPI_TABLE_HEADER       LocalHeader;

    /*

     * The reason that the Address is cast to a void pointer is so that we

     * can use %p which will work properly on both 32-bit and 64-bit hosts.

     */

    if (ACPI_COMPARE_NAME (Header->Signature, ACPI_SIG_FACS))

    {

        /* FACS only has signature and length fields */

        ACPI_INFO ((AE_INFO, "%4.4s %p %05X",

            Header->Signature, ACPI_CAST_PTR (void, Address),

            Header->Length));

    }

    else if (ACPI_COMPARE_NAME (Header->Signature, ACPI_SIG_RSDP))

    {

        /* RSDP has no common fields */

        ACPI_MEMCPY (LocalHeader.OemId,

            ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->OemId, ACPI_OEM_ID_SIZE);

        AcpiTbFixString (LocalHeader.OemId, ACPI_OEM_ID_SIZE);

        ACPI_INFO ((AE_INFO, "RSDP %p %05X (v%.2d %6.6s)",

            ACPI_CAST_PTR (void, Address),

            (ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->Revision > 0) ?

                ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->Length : 20,

            ACPI_CAST_PTR (ACPI_TABLE_RSDP, Header)->Revision,

            LocalHeader.OemId));

    }

    else

    {

        /* Standard ACPI table with full common header */

        AcpiTbCleanupTableHeader (&LocalHeader, Header);

        ACPI_INFO ((AE_INFO,

            "%4.4s %p %05X (v%.2d %6.6s %8.8s %08X %4.4s %08X)",

            LocalHeader.Signature, ACPI_CAST_PTR (void, Address),

            LocalHeader.Length, LocalHeader.Revision, LocalHeader.OemId,

            LocalHeader.OemTableId, LocalHeader.OemRevision,

            LocalHeader.AslCompilerId, LocalHeader.AslCompilerRevision));

    }

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbValidateChecksum

 *

 * PARAMETERS:  Table               - ACPI table to verify

 *              Length              - Length of entire table

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns

 *              exception on bad checksum.

 *

 ******************************************************************************/

ACPI_STATUS

AcpiTbVerifyChecksum (

    ACPI_TABLE_HEADER       *Table,

    UINT32                  Length)

{

    UINT8                   Checksum;

    /* Compute the checksum on the table */

    Checksum = AcpiTbChecksum (ACPI_CAST_PTR (UINT8, Table), Length);

    /* Checksum ok? (should be zero) */

    if (Checksum)

    {

        ACPI_WARNING ((AE_INFO,

            "Incorrect checksum in table [%4.4s] - 0x%2.2X, should be 0x%2.2X",

            Table->Signature, Table->Checksum,

            (UINT8) (Table->Checksum - Checksum)));

#if (ACPI_CHECKSUM_ABORT)

        return (AE_BAD_CHECKSUM);

#endif

    }

    return (AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbChecksum

 *

 * PARAMETERS:  Buffer          - Pointer to memory region to be checked

 *              Length          - Length of this memory region

 *

 * RETURN:      Checksum (UINT8)

 *

 * DESCRIPTION: Calculates circular checksum of memory region.

 *

 ******************************************************************************/

UINT8

AcpiTbChecksum (

    UINT8                   *Buffer,

    UINT32                  Length)

{

    UINT8                   Sum = 0;

    UINT8                   *End = Buffer + Length;

    while (Buffer < End)

    {

        Sum = (UINT8) (Sum + *(Buffer++));

    }

    return Sum;

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbCheckDsdtHeader

 *

 * PARAMETERS:  None

 *

 * RETURN:      None

 *

 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect

 *              if the DSDT has been replaced from outside the OS and/or if

 *              the DSDT header has been corrupted.

 *

 ******************************************************************************/

void

AcpiTbCheckDsdtHeader (

    void)

{

    /* Compare original length and checksum to current values */

    if (AcpiGbl_OriginalDsdtHeader.Length != AcpiGbl_DSDT->Length ||

        AcpiGbl_OriginalDsdtHeader.Checksum != AcpiGbl_DSDT->Checksum)

    {

        ACPI_ERROR ((AE_INFO,

            "The DSDT has been corrupted or replaced - old, new headers below"));

        AcpiTbPrintTableHeader (0, &AcpiGbl_OriginalDsdtHeader);

        AcpiTbPrintTableHeader (0, AcpiGbl_DSDT);

        /* Disable further error messages */

        AcpiGbl_OriginalDsdtHeader.Length = AcpiGbl_DSDT->Length;

        AcpiGbl_OriginalDsdtHeader.Checksum = AcpiGbl_DSDT->Checksum;

    }

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbCopyDsdt

 *

 * PARAMETERS:  TableDesc           - Installed table to copy

 *

 * RETURN:      None

 *

 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.

 *              Some very bad BIOSs are known to either corrupt the DSDT or

 *              install a new, bad DSDT. This copy works around the problem.

 *

 ******************************************************************************/

ACPI_TABLE_HEADER *

AcpiTbCopyDsdt (

    UINT32                  TableIndex)

{

    ACPI_TABLE_HEADER       *NewTable;

    ACPI_TABLE_DESC         *TableDesc;

    TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex];

    NewTable = ACPI_ALLOCATE (TableDesc->Length);

    if (!NewTable)

    {

        ACPI_ERROR ((AE_INFO, "Could not copy DSDT of length 0x%X",

            TableDesc->Length));

        return (NULL);

    }

    ACPI_MEMCPY (NewTable, TableDesc->Pointer, TableDesc->Length);

    AcpiTbDeleteTable (TableDesc);

    TableDesc->Pointer = NewTable;

    TableDesc->Flags = ACPI_TABLE_ORIGIN_ALLOCATED;

    ACPI_INFO ((AE_INFO,

        "Forced DSDT copy: length 0x%05X copied locally, original unmapped",

        NewTable->Length));

    return (NewTable);

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbInstallTable

 *

 * PARAMETERS:  Address                 - Physical address of DSDT or FACS

 *              Signature               - Table signature, NULL if no need to

 *                                        match

 *              TableIndex              - Index into root table array

 *

 * RETURN:      None

 *

 * DESCRIPTION: Install an ACPI table into the global data structure. The

 *              table override mechanism is implemented here to allow the host

 *              OS to replace any table before it is installed in the root

 *              table array.

 *

 ******************************************************************************/

void

AcpiTbInstallTable (

    ACPI_PHYSICAL_ADDRESS   Address,

    char                    *Signature,

    UINT32                  TableIndex)

{

    UINT8                   Flags;

    ACPI_STATUS             Status;

    ACPI_TABLE_HEADER       *TableToInstall;

    ACPI_TABLE_HEADER       *MappedTable;

    ACPI_TABLE_HEADER       *OverrideTable = NULL;

    if (!Address)

    {

        ACPI_ERROR ((AE_INFO, "Null physical address for ACPI table [%s]",

            Signature));

        return;

    }

    /* Map just the table header */

    MappedTable = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));

    if (!MappedTable)

    {

        return;

    }

    /* If a particular signature is expected (DSDT/FACS), it must match */

    if (Signature &&

        !ACPI_COMPARE_NAME (MappedTable->Signature, Signature))

    {

        ACPI_ERROR ((AE_INFO,

            "Invalid signature 0x%X for ACPI table, expected [%s]",

            *ACPI_CAST_PTR (UINT32, MappedTable->Signature), Signature));

        goto UnmapAndExit;

    }

    /*

     * ACPI Table Override:

     *

     * Before we install the table, let the host OS override it with a new

     * one if desired. Any table within the RSDT/XSDT can be replaced,

     * including the DSDT which is pointed to by the FADT.

     */

    Status = AcpiOsTableOverride (MappedTable, &OverrideTable);

    if (ACPI_SUCCESS (Status) && OverrideTable)

    {

        ACPI_INFO ((AE_INFO,

            "%4.4s @ 0x%p Table override, replaced with:",

            MappedTable->Signature, ACPI_CAST_PTR (void, Address)));

        AcpiGbl_RootTableList.Tables[TableIndex].Pointer = OverrideTable;

        Address = ACPI_PTR_TO_PHYSADDR (OverrideTable);

        TableToInstall = OverrideTable;

        Flags = ACPI_TABLE_ORIGIN_OVERRIDE;

    }

    else

    {

        TableToInstall = MappedTable;

        Flags = ACPI_TABLE_ORIGIN_MAPPED;

    }

    /* Initialize the table entry */

    AcpiGbl_RootTableList.Tables[TableIndex].Address = Address;

    AcpiGbl_RootTableList.Tables[TableIndex].Length = TableToInstall->Length;

    AcpiGbl_RootTableList.Tables[TableIndex].Flags = Flags;

    ACPI_MOVE_32_TO_32 (

        &(AcpiGbl_RootTableList.Tables[TableIndex].Signature),

        TableToInstall->Signature);

    AcpiTbPrintTableHeader (Address, TableToInstall);

    if (TableIndex == ACPI_TABLE_INDEX_DSDT)

    {

        /* Global integer width is based upon revision of the DSDT */

        AcpiUtSetIntegerWidth (TableToInstall->Revision);

    }

UnmapAndExit:

    AcpiOsUnmapMemory (MappedTable, sizeof (ACPI_TABLE_HEADER));

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbGetRootTableEntry

 *

 * PARAMETERS:  TableEntry          - Pointer to the RSDT/XSDT table entry

 *              TableEntrySize      - sizeof 32 or 64 (RSDT or XSDT)

 *

 * RETURN:      Physical address extracted from the root table

 *

 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on

 *              both 32-bit and 64-bit platforms

 *

 * NOTE:        ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on

 *              64-bit platforms.

 *

 ******************************************************************************/

static ACPI_PHYSICAL_ADDRESS

AcpiTbGetRootTableEntry (

    UINT8                   *TableEntry,

    UINT32                  TableEntrySize)

{

    UINT64                  Address64;

    /*

     * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):

     * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT

     */

    if (TableEntrySize == sizeof (UINT32))

    {

        /*

         * 32-bit platform, RSDT: Return 32-bit table entry

         * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return

         */

        return ((ACPI_PHYSICAL_ADDRESS) (*ACPI_CAST_PTR (UINT32, TableEntry)));

    }

    else

    {

        /*

         * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return

         * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,

         *  return 64-bit

         */

        ACPI_MOVE_64_TO_64 (&Address64, TableEntry);

#if ACPI_MACHINE_WIDTH == 32

        if (Address64 > ACPI_UINT32_MAX)

        {

            /* Will truncate 64-bit address to 32 bits, issue warning */

            ACPI_WARNING ((AE_INFO,

                "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"

                " truncating",

                ACPI_FORMAT_UINT64 (Address64)));

        }

#endif

        return ((ACPI_PHYSICAL_ADDRESS) (Address64));

    }

}

/*******************************************************************************

 *

 * FUNCTION:    AcpiTbParseRootTable

 *

 * PARAMETERS:  Rsdp                    - Pointer to the RSDP

 *

 * RETURN:      Status

 *

 * DESCRIPTION: This function is called to parse the Root System Description

 *              Table (RSDT or XSDT)

 *

 * NOTE:        Tables are mapped (not copied) for efficiency. The FACS must

 *              be mapped and cannot be copied because it contains the actual

 *              memory location of the ACPI Global Lock.

 *

 ******************************************************************************/

ACPI_STATUS

AcpiTbParseRootTable (

    ACPI_PHYSICAL_ADDRESS   RsdpAddress)

{

    ACPI_TABLE_RSDP         *Rsdp;

    UINT32                  TableEntrySize;

    UINT32                  i;

    UINT32                  TableCount;

    ACPI_TABLE_HEADER       *Table;

    ACPI_PHYSICAL_ADDRESS   Address;

    UINT32                  Length;

    UINT8                   *TableEntry;

    ACPI_STATUS             Status;

    ACPI_FUNCTION_TRACE (TbParseRootTable);

    /*

     * Map the entire RSDP and extract the address of the RSDT or XSDT

     */

    Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP));

    if (!Rsdp)

    {

        return_ACPI_STATUS (AE_NO_MEMORY);

    }

    AcpiTbPrintTableHeader (RsdpAddress,

        ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp));

    /* Differentiate between RSDT and XSDT root tables */

    if (Rsdp->Revision > 1 && Rsdp->XsdtPhysicalAddress)

    {

        /*

         * Root table is an XSDT (64-bit physical addresses). We must use the

         * XSDT if the revision is > 1 and the XSDT pointer is present, as per

         * the ACPI specification.

         */

        Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress;

        TableEntrySize = sizeof (UINT64);

    }

    else

    {

        /* Root table is an RSDT (32-bit physical addresses) */

        Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;

        TableEntrySize = sizeof (UINT32);

    }

    /*

     * It is not possible to map more than one entry in some environments,

     * so unmap the RSDP here before mapping other tables

     */

    AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP));

    /* Map the RSDT/XSDT table header to get the full table length */

    Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));

    if (!Table)

    {

        return_ACPI_STATUS (AE_NO_MEMORY);

    }

    AcpiTbPrintTableHeader (Address, Table);

    /* Get the length of the full table, verify length and map entire table */

    Length = Table->Length;

    AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));

    if (Length < sizeof (ACPI_TABLE_HEADER))

    {

        ACPI_ERROR ((AE_INFO, "Invalid length 0x%X in RSDT/XSDT", Length));

        return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);

    }

    Table = AcpiOsMapMemory (Address, Length);

    if (!Table)

    {

        return_ACPI_STATUS (AE_NO_MEMORY);

    }

    /* Validate the root table checksum */

    Status = AcpiTbVerifyChecksum (Table, Length);

    if (ACPI_FAILURE (Status))

    {

        AcpiOsUnmapMemory (Table, Length);

        return_ACPI_STATUS (Status);

    }

    /* Calculate the number of tables described in the root table */

    TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /

        TableEntrySize);

    /*

     * First two entries in the table array are reserved for the DSDT

     * and FACS, which are not actually present in the RSDT/XSDT - they

     * come from the FADT

     */

    TableEntry = ACPI_CAST_PTR (UINT8, Table) + sizeof (ACPI_TABLE_HEADER);

    AcpiGbl_RootTableList.CurrentTableCount = 2;

    /*

     * Initialize the root table array from the RSDT/XSDT

     */

    for (i = 0; i < TableCount; i++)

    {

        if (AcpiGbl_RootTableList.CurrentTableCount >=

            AcpiGbl_RootTableList.MaxTableCount)

        {

            /* There is no more room in the root table array, attempt resize */

            Status = AcpiTbResizeRootTableList ();

            if (ACPI_FAILURE (Status))

            {

                ACPI_WARNING ((AE_INFO, "Truncating %u table entries!",

                    (unsigned) (TableCount -

                    (AcpiGbl_RootTableList.CurrentTableCount - 2))));

                break;

            }

        }

        /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */

        AcpiGbl_RootTableList.Tables[AcpiGbl_RootTableList.CurrentTableCount].Address =

            AcpiTbGetRootTableEntry (TableEntry, TableEntrySize);

        TableEntry += TableEntrySize;

        AcpiGbl_RootTableList.CurrentTableCount++;

    }

    /*

     * It is not possible to map more than one entry in some environments,

     * so unmap the root table here before mapping other tables

     */

    AcpiOsUnmapMemory (Table, Length);

    /*

     * Complete the initialization of the root table array by examining

     * the header of each table

     */

    for (i = 2; i < AcpiGbl_RootTableList.CurrentTableCount; i++)

    {

        AcpiTbInstallTable (AcpiGbl_RootTableList.Tables[i].Address,

            NULL, i);

        /* Special case for FADT - get the DSDT and FACS */

        if (ACPI_COMPARE_NAME (

                &AcpiGbl_RootTableList.Tables[i].Signature, ACPI_SIG_FADT))

        {

            AcpiTbParseFadt (i);

        }

    }

    return_ACPI_STATUS (AE_OK);

}