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

 *

 * Module Name: utosi - Support for the _OSI predefined control method

 *

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

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

 *

 * 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 __UTOSI_C__

#include "acpi.h"

#include "accommon.h"

#define _COMPONENT          ACPI_UTILITIES

        ACPI_MODULE_NAME    ("utosi")

/*

 * Strings supported by the _OSI predefined control method (which is

 * implemented internally within this module.)

 *

 * March 2009: Removed "Linux" as this host no longer wants to respond true

 * for this string. Basically, the only safe OS strings are windows-related

 * and in many or most cases represent the only test path within the

 * BIOS-provided ASL code.

 *

 * The last element of each entry is used to track the newest version of

 * Windows that the BIOS has requested.

 */

static ACPI_INTERFACE_INFO    AcpiDefaultSupportedInterfaces[] =

{

    /* Operating System Vendor Strings */

    {"Windows 2000",        NULL, 0, ACPI_OSI_WIN_2000},         /* Windows 2000 */

    {"Windows 2001",        NULL, 0, ACPI_OSI_WIN_XP},           /* Windows XP */

    {"Windows 2001 SP1",    NULL, 0, ACPI_OSI_WIN_XP_SP1},       /* Windows XP SP1 */

    {"Windows 2001.1",      NULL, 0, ACPI_OSI_WINSRV_2003},      /* Windows Server 2003 */

    {"Windows 2001 SP2",    NULL, 0, ACPI_OSI_WIN_XP_SP2},       /* Windows XP SP2 */

    {"Windows 2001.1 SP1",  NULL, 0, ACPI_OSI_WINSRV_2003_SP1},  /* Windows Server 2003 SP1 - Added 03/2006 */

    {"Windows 2006",        NULL, 0, ACPI_OSI_WIN_VISTA},        /* Windows Vista - Added 03/2006 */

    {"Windows 2006.1",      NULL, 0, ACPI_OSI_WINSRV_2008},      /* Windows Server 2008 - Added 09/2009 */

    {"Windows 2006 SP1",    NULL, 0, ACPI_OSI_WIN_VISTA_SP1},    /* Windows Vista SP1 - Added 09/2009 */

    {"Windows 2006 SP2",    NULL, 0, ACPI_OSI_WIN_VISTA_SP2},    /* Windows Vista SP2 - Added 09/2010 */

    {"Windows 2009",        NULL, 0, ACPI_OSI_WIN_7},            /* Windows 7 and Server 2008 R2 - Added 09/2009 */

    /* Feature Group Strings */

    {"Extended Address Space Descriptor", NULL, 0, 0}

    /*

     * All "optional" feature group strings (features that are implemented

     * by the host) should be dynamically added by the host via

     * AcpiInstallInterface and should not be manually added here.

     *

     * Examples of optional feature group strings:

     *

     * "Module Device"

     * "Processor Device"

     * "3.0 Thermal Model"

     * "3.0 _SCP Extensions"

     * "Processor Aggregator Device"

     */

};

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

 *

 * FUNCTION:    AcpiUtInitializeInterfaces

 *

 * PARAMETERS:  None

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Initialize the global _OSI supported interfaces list

 *

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

ACPI_STATUS

AcpiUtInitializeInterfaces (

    void)

{

    UINT32                  i;

    (void) AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);

    AcpiGbl_SupportedInterfaces = AcpiDefaultSupportedInterfaces;

    /* Link the static list of supported interfaces */

    for (i = 0; i < (ACPI_ARRAY_LENGTH (AcpiDefaultSupportedInterfaces) - 1); i++)

    {

        AcpiDefaultSupportedInterfaces[i].Next =

            &AcpiDefaultSupportedInterfaces[(ACPI_SIZE) i + 1];

    }

    AcpiOsReleaseMutex (AcpiGbl_OsiMutex);

    return (AE_OK);

}

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

 *

 * FUNCTION:    AcpiUtInterfaceTerminate

 *

 * PARAMETERS:  None

 *

 * RETURN:      None

 *

 * DESCRIPTION: Delete all interfaces in the global list. Sets

 *              AcpiGbl_SupportedInterfaces to NULL.

 *

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

void

AcpiUtInterfaceTerminate (

    void)

{

    ACPI_INTERFACE_INFO     *NextInterface;

    (void) AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);

    NextInterface = AcpiGbl_SupportedInterfaces;

    while (NextInterface)

    {

        AcpiGbl_SupportedInterfaces = NextInterface->Next;

        /* Only interfaces added at runtime can be freed */

        if (NextInterface->Flags & ACPI_OSI_DYNAMIC)

        {

            ACPI_FREE (NextInterface->Name);

            ACPI_FREE (NextInterface);

        }

        NextInterface = AcpiGbl_SupportedInterfaces;

    }

    AcpiOsReleaseMutex (AcpiGbl_OsiMutex);

}

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

 *

 * FUNCTION:    AcpiUtInstallInterface

 *

 * PARAMETERS:  InterfaceName       - The interface to install

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Install the interface into the global interface list.

 *              Caller MUST hold AcpiGbl_OsiMutex

 *

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

ACPI_STATUS

AcpiUtInstallInterface (

    ACPI_STRING             InterfaceName)

{

    ACPI_INTERFACE_INFO     *InterfaceInfo;

    /* Allocate info block and space for the name string */

    InterfaceInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_INTERFACE_INFO));

    if (!InterfaceInfo)

    {

        return (AE_NO_MEMORY);

    }

    InterfaceInfo->Name = ACPI_ALLOCATE_ZEROED (ACPI_STRLEN (InterfaceName) + 1);

    if (!InterfaceInfo->Name)

    {

        ACPI_FREE (InterfaceInfo);

        return (AE_NO_MEMORY);

    }

    /* Initialize new info and insert at the head of the global list */

    ACPI_STRCPY (InterfaceInfo->Name, InterfaceName);

    InterfaceInfo->Flags = ACPI_OSI_DYNAMIC;

    InterfaceInfo->Next = AcpiGbl_SupportedInterfaces;

    AcpiGbl_SupportedInterfaces = InterfaceInfo;

    return (AE_OK);

}

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

 *

 * FUNCTION:    AcpiUtRemoveInterface

 *

 * PARAMETERS:  InterfaceName       - The interface to remove

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Remove the interface from the global interface list.

 *              Caller MUST hold AcpiGbl_OsiMutex

 *

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

ACPI_STATUS

AcpiUtRemoveInterface (

    ACPI_STRING             InterfaceName)

{

    ACPI_INTERFACE_INFO     *PreviousInterface;

    ACPI_INTERFACE_INFO     *NextInterface;

    PreviousInterface = NextInterface = AcpiGbl_SupportedInterfaces;

    while (NextInterface)

    {

        if (!ACPI_STRCMP (InterfaceName, NextInterface->Name))

        {

            /* Found: name is in either the static list or was added at runtime */

            if (NextInterface->Flags & ACPI_OSI_DYNAMIC)

            {

                /* Interface was added dynamically, remove and free it */

                if (PreviousInterface == NextInterface)

                {

                    AcpiGbl_SupportedInterfaces = NextInterface->Next;

                }

                else

                {

                    PreviousInterface->Next = NextInterface->Next;

                }

                ACPI_FREE (NextInterface->Name);

                ACPI_FREE (NextInterface);

            }

            else

            {

                /*

                 * Interface is in static list. If marked invalid, then it

                 * does not actually exist. Else, mark it invalid.

                 */

                if (NextInterface->Flags & ACPI_OSI_INVALID)

                {

                    return (AE_NOT_EXIST);

                }

                NextInterface->Flags |= ACPI_OSI_INVALID;

            }

            return (AE_OK);

        }

        PreviousInterface = NextInterface;

        NextInterface = NextInterface->Next;

    }

    /* Interface was not found */

    return (AE_NOT_EXIST);

}

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

 *

 * FUNCTION:    AcpiUtGetInterface

 *

 * PARAMETERS:  InterfaceName       - The interface to find

 *

 * RETURN:      ACPI_INTERFACE_INFO if found. NULL if not found.

 *

 * DESCRIPTION: Search for the specified interface name in the global list.

 *              Caller MUST hold AcpiGbl_OsiMutex

 *

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

ACPI_INTERFACE_INFO *

AcpiUtGetInterface (

    ACPI_STRING             InterfaceName)

{

    ACPI_INTERFACE_INFO     *NextInterface;

    NextInterface = AcpiGbl_SupportedInterfaces;

    while (NextInterface)

    {

        if (!ACPI_STRCMP (InterfaceName, NextInterface->Name))

        {

            return (NextInterface);

        }

        NextInterface = NextInterface->Next;

    }

    return (NULL);

}

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

 *

 * FUNCTION:    AcpiUtOsiImplementation

 *

 * PARAMETERS:  WalkState           - Current walk state

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Implementation of the _OSI predefined control method. When

 *              an invocation of _OSI is encountered in the system AML,

 *              control is transferred to this function.

 *

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

ACPI_STATUS

AcpiUtOsiImplementation (

    ACPI_WALK_STATE         *WalkState)

{

    ACPI_OPERAND_OBJECT     *StringDesc;

    ACPI_OPERAND_OBJECT     *ReturnDesc;

    ACPI_INTERFACE_INFO     *InterfaceInfo;

    ACPI_INTERFACE_HANDLER  InterfaceHandler;

    UINT32                  ReturnValue;

    ACPI_FUNCTION_TRACE (UtOsiImplementation);

    /* Validate the string input argument (from the AML caller) */

    StringDesc = WalkState->Arguments[0].Object;

    if (!StringDesc ||

        (StringDesc->Common.Type != ACPI_TYPE_STRING))

    {

        return_ACPI_STATUS (AE_TYPE);

    }

    /* Create a return object */

    ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);

    if (!ReturnDesc)

    {

        return_ACPI_STATUS (AE_NO_MEMORY);

    }

    /* Default return value is 0, NOT SUPPORTED */

    ReturnValue = 0;

    (void) AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);

    /* Lookup the interface in the global _OSI list */

    InterfaceInfo = AcpiUtGetInterface (StringDesc->String.Pointer);

    if (InterfaceInfo &&

        !(InterfaceInfo->Flags & ACPI_OSI_INVALID))

    {

        /*

         * The interface is supported.

         * Update the OsiData if necessary. We keep track of the latest

         * version of Windows that has been requested by the BIOS.

         */

        if (InterfaceInfo->Value > AcpiGbl_OsiData)

        {

            AcpiGbl_OsiData = InterfaceInfo->Value;

        }

        ReturnValue = ACPI_UINT32_MAX;

    }

    AcpiOsReleaseMutex (AcpiGbl_OsiMutex);

    /*

     * Invoke an optional _OSI interface handler. The host OS may wish

     * to do some interface-specific handling. For example, warn about

     * certain interfaces or override the true/false support value.

     */

    InterfaceHandler = AcpiGbl_InterfaceHandler;

    if (InterfaceHandler)

    {

        ReturnValue = InterfaceHandler (

            StringDesc->String.Pointer, ReturnValue);

    }

    ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INFO,

        "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",

        StringDesc->String.Pointer, ReturnValue == 0 ? "not " : ""));

    /* Complete the return object */

    ReturnDesc->Integer.Value = ReturnValue;

    WalkState->ReturnDesc = ReturnDesc;

    return_ACPI_STATUS (AE_OK);

}