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 *

 * Module Name: hwvalid - I/O request validation

 *

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

 *

 * 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 "accommon.h"

        ACPI_MODULE_NAME    ("hwvalid")

AcpiHwValidateIoRequest (

    ACPI_IO_ADDRESS         Address,

    UINT32                  BitWidth);

 * Protected I/O ports. Some ports are always illegal, and some are

 * conditionally illegal. This table must remain ordered by port address.

 *

 * The table is used to implement the Microsoft port access rules that

 * first appeared in Windows XP. Some ports are always illegal, and some

 * ports are only illegal if the BIOS calls _OSI with a WinXP string or

 * later (meaning that the BIOS itelf is post-XP.)

 *

 * This provides ACPICA with the desired port protections and

 * Microsoft compatibility.

 *

 * Description of port entries:

 *  DMA:   DMA controller

 *  PIC0:  Programmable Interrupt Controller (8259A)

 *  PIT1:  System Timer 1

 *  PIT2:  System Timer 2 failsafe

 *  RTC:   Real-time clock

 *  CMOS:  Extended CMOS

 *  DMA1:  DMA 1 page registers

 *  DMA1L: DMA 1 Ch 0 low page

 *  DMA2:  DMA 2 page registers

 *  DMA2L: DMA 2 low page refresh

 *  ARBC:  Arbitration control

 *  SETUP: Reserved system board setup

 *  POS:   POS channel select

 *  PIC1:  Cascaded PIC

 *  IDMA:  ISA DMA

 *  ELCR:  PIC edge/level registers

 *  PCI:   PCI configuration space

 */

static const ACPI_PORT_INFO     AcpiProtectedPorts[] =

{

    {"DMA",     0x0000, 0x000F, ACPI_OSI_WIN_XP},

    {"PIC0",    0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL},

    {"PIT1",    0x0040, 0x0043, ACPI_OSI_WIN_XP},

    {"PIT2",    0x0048, 0x004B, ACPI_OSI_WIN_XP},

    {"RTC",     0x0070, 0x0071, ACPI_OSI_WIN_XP},

    {"CMOS",    0x0074, 0x0076, ACPI_OSI_WIN_XP},

    {"DMA1",    0x0081, 0x0083, ACPI_OSI_WIN_XP},

    {"DMA1L",   0x0087, 0x0087, ACPI_OSI_WIN_XP},

    {"DMA2",    0x0089, 0x008B, ACPI_OSI_WIN_XP},

    {"DMA2L",   0x008F, 0x008F, ACPI_OSI_WIN_XP},

    {"ARBC",    0x0090, 0x0091, ACPI_OSI_WIN_XP},

    {"SETUP",   0x0093, 0x0094, ACPI_OSI_WIN_XP},

    {"POS",     0x0096, 0x0097, ACPI_OSI_WIN_XP},

    {"PIC1",    0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL},

    {"IDMA",    0x00C0, 0x00DF, ACPI_OSI_WIN_XP},

    {"ELCR",    0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL},

    {"PCI",     0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP}

};

 *

 * FUNCTION:    AcpiHwValidateIoRequest

 *

 * PARAMETERS:  Address             Address of I/O port/register

 *              BitWidth            Number of bits (8,16,32)

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Validates an I/O request (address/length). Certain ports are

 *              always illegal and some ports are only illegal depending on

 *              the requests the BIOS AML code makes to the predefined

 *              _OSI method.

 *

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

AcpiHwValidateIoRequest (

    ACPI_IO_ADDRESS         Address,

    UINT32                  BitWidth)

{

    UINT32                  i;

    UINT32                  ByteWidth;

    ACPI_IO_ADDRESS         LastAddress;

    const ACPI_PORT_INFO    *PortInfo;

        (BitWidth != 16) &&

        (BitWidth != 32))

    {

        return (AE_BAD_PARAMETER);

    }

    ByteWidth = ACPI_DIV_8 (BitWidth);

    LastAddress = Address + ByteWidth - 1;

        ACPI_CAST_PTR (void, Address), ACPI_CAST_PTR (void, LastAddress),

        ByteWidth));

    {

        ACPI_ERROR ((AE_INFO,

            "Illegal I/O port address/length above 64K: %p/0x%X",

            ACPI_CAST_PTR (void, Address), ByteWidth));

        return_ACPI_STATUS (AE_LIMIT);

    }

    {

        return_ACPI_STATUS (AE_OK);

    }

    {

        /*

         * Check if the requested address range will write to a reserved

         * port. Four cases to consider:

         *

         * 1) Address range is contained completely in the port address range

         * 2) Address range overlaps port range at the port range start

         * 3) Address range overlaps port range at the port range end

         * 4) Address range completely encompasses the port range

         */

        if ((Address <= PortInfo->End) && (LastAddress >= PortInfo->Start))

        {

            /* Port illegality may depend on the _OSI calls made by the BIOS */

            {

                ACPI_DEBUG_PRINT ((ACPI_DB_IO,

                    "Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",

                    ACPI_CAST_PTR (void, Address), ByteWidth, PortInfo->Name,

                    PortInfo->Start, PortInfo->End));

            }

        }

        {

            break;

        }

    }

}

 *

 * FUNCTION:    AcpiHwReadPort

 *

 * PARAMETERS:  Address             Address of I/O port/register to read

 *              Value               Where value is placed

 *              Width               Number of bits

 *

 * RETURN:      Status and value read from port

 *

 * DESCRIPTION: Read data from an I/O port or register. This is a front-end

 *              to AcpiOsReadPort that performs validation on both the port

 *              address and the length.

 *

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

AcpiHwReadPort (

    ACPI_IO_ADDRESS         Address,

    UINT32                  *Value,

    UINT32                  Width)

{

    ACPI_STATUS             Status;

    UINT32                  OneByte;

    UINT32                  i;

    {

        Address &= ACPI_UINT16_MAX;

    }

    if (ACPI_SUCCESS (Status))

    {

        Status = AcpiOsReadPort (Address, Value, Width);

        return (Status);

    }

    {

        return (Status);

    }

     * There has been a protection violation within the request. Fall

     * back to byte granularity port I/O and ignore the failing bytes.

     * This provides Windows compatibility.

     */

    for (i = 0, *Value = 0; i < Width; i += 8)

    {

        /* Validate and read one byte */

        {

            Status = AcpiOsReadPort (Address, &OneByte, 8);

            if (ACPI_FAILURE (Status))

            {

                return (Status);

            }

        }

    }

}

 *

 * FUNCTION:    AcpiHwWritePort

 *

 * PARAMETERS:  Address             Address of I/O port/register to write

 *              Value               Value to write

 *              Width               Number of bits

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Write data to an I/O port or register. This is a front-end

 *              to AcpiOsWritePort that performs validation on both the port

 *              address and the length.

 *

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

AcpiHwWritePort (

    ACPI_IO_ADDRESS         Address,

    UINT32                  Value,

    UINT32                  Width)

{

    ACPI_STATUS             Status;

    UINT32                  i;

    {

        Address &= ACPI_UINT16_MAX;

    }

    if (ACPI_SUCCESS (Status))

    {

        Status = AcpiOsWritePort (Address, Value, Width);

        return (Status);

    }

    {

        return (Status);

    }

     * There has been a protection violation within the request. Fall

     * back to byte granularity port I/O and ignore the failing bytes.

     * This provides Windows compatibility.

     */

    for (i = 0; i < Width; i += 8)

    {

        /* Validate and write one byte */

        {

            Status = AcpiOsWritePort (Address, (Value >> i) & 0xFF, 8);

            if (ACPI_FAILURE (Status))

            {

                return (Status);

            }

        }

    }

}