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

 *

 * Module Name: oswintbl - Windows OSL for obtaining ACPI tables

 *

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

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

 *

 * 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.

 *

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

#include "acpi.h"

#ifdef WIN32

#pragma warning(disable:4115)   /* warning C4115: (caused by rpcasync.h) */

#include 

#elif WIN64

#include 

#endif

#define _COMPONENT          ACPI_OS_SERVICES

        ACPI_MODULE_NAME    ("oswintbl")

static char             KeyBuffer[64];

static char             ErrorBuffer[64];

/* Little front-end to win FormatMessage */

char *

OsFormatException (

    LONG                Status)

{

    ErrorBuffer[0] = 0;

    FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM, NULL, Status, 0,

        ErrorBuffer, 64, NULL);

    return (ErrorBuffer);

}

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

 *

 * FUNCTION:    OsGetTable

 *

 * PARAMETERS:  Signature       - ACPI Signature for desired table. must be

 *                                  a null terminated string.

 *

 * RETURN:      Pointer to the table. NULL if failure.

 *

 * DESCRIPTION: Get an ACPI table from the Windows registry.

 *

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

ACPI_TABLE_HEADER *

OsGetTable (

    char                *Signature)

{

    HKEY                Handle = NULL;

    ULONG               i;

    LONG                Status;

    ULONG               Type;

    ULONG               NameSize;

    ULONG               DataSize;

    HKEY                SubKey;

    ACPI_TABLE_HEADER   *ReturnTable;

    /* Get a handle to the table key */

    while (1)

    {

        ACPI_STRCPY (KeyBuffer, "HARDWARE\\ACPI\\");

        ACPI_STRCAT (KeyBuffer, Signature);

        Status = RegOpenKeyEx (HKEY_LOCAL_MACHINE, KeyBuffer,

                    0L, KEY_READ, &Handle);

        if (Status != ERROR_SUCCESS)

        {

            /*

             * Somewhere along the way, MS changed the registry entry for

             * the FADT from

             * HARDWARE/ACPI/FACP  to

             * HARDWARE/ACPI/FADT.

             *

             * This code allows for both.

             */

            if (ACPI_COMPARE_NAME (Signature, "FACP"))

            {

                Signature = "FADT";

            }

            else

            {

                AcpiOsPrintf (

                    "Could not find %s in registry at %s: %s (Status=0x%X)\n",

                    Signature, KeyBuffer, OsFormatException (Status), Status);

                return (NULL);

            }

        }

        else

        {

            break;

        }

    }

    /* Actual data for table is down a couple levels */

    for (i = 0; ;)

    {

        Status = RegEnumKey (Handle, i, KeyBuffer, sizeof (KeyBuffer));

        i += 1;

        if (Status == ERROR_NO_MORE_ITEMS)

        {

            break;

        }

        Status = RegOpenKey (Handle, KeyBuffer, &SubKey);

        if (Status != ERROR_SUCCESS)

        {

            AcpiOsPrintf ("Could not open %s entry: %s\n",

                Signature, OsFormatException (Status));

            return (NULL);

        }

        RegCloseKey (Handle);

        Handle = SubKey;

        i = 0;

    }

    /* Find the (binary) table entry */

    for (i = 0; ;)

    {

        NameSize = sizeof (KeyBuffer);

        Status = RegEnumValue (Handle, i, KeyBuffer, &NameSize,

                    NULL, &Type, NULL, 0);

        if (Status != ERROR_SUCCESS)

        {

            AcpiOsPrintf ("Could not get %s registry entry: %s\n",

                Signature, OsFormatException (Status));

            return (NULL);

        }

        if (Type == REG_BINARY)

        {

            break;

        }

        i += 1;

    }

    /* Get the size of the table */

    Status = RegQueryValueEx (Handle, KeyBuffer, NULL, NULL, NULL, &DataSize);

    if (Status != ERROR_SUCCESS)

    {

        AcpiOsPrintf ("Could not read the %s table size: %s\n",

            Signature, OsFormatException (Status));

        return (NULL);

    }

    /* Allocate a new buffer for the table */

    ReturnTable = AcpiOsAllocate (DataSize);

    if (!ReturnTable)

    {

        goto Cleanup;

    }

    /* Get the actual table from the registry */

    Status = RegQueryValueEx (Handle, KeyBuffer, NULL, NULL,

                (UCHAR *) ReturnTable, &DataSize);

    if (Status != ERROR_SUCCESS)

    {

        AcpiOsPrintf ("Could not read %s data: %s\n",

            Signature, OsFormatException (Status));

        AcpiOsFree (ReturnTable);

        return (NULL);

    }

Cleanup:

    RegCloseKey (Handle);

    return (ReturnTable);

}