exregion.c

Go to the documentation of this file.

/******************************************************************************
 *
 * Module Name: exregion - ACPI default OpRegion (address space) handlers
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 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 __EXREGION_C__

#include "acpi.h"
#include "accommon.h"
#include "acinterp.h"


#define _COMPONENT          ACPI_EXECUTER
        ACPI_MODULE_NAME    ("exregion")


/*******************************************************************************
 *
 * FUNCTION:    AcpiExSystemMemorySpaceHandler
 *
 * PARAMETERS:  Function            - Read or Write operation
 *              Address             - Where in the space to read or write
 *              BitWidth            - Field width in bits (8, 16, or 32)
 *              Value               - Pointer to in or out value
 *              HandlerContext      - Pointer to Handler's context
 *              RegionContext       - Pointer to context specific to the
 *                                    accessed region
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handler for the System Memory address space (Op Region)
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExSystemMemorySpaceHandler (
    UINT32                  Function,
    ACPI_PHYSICAL_ADDRESS   Address,
    UINT32                  BitWidth,
    UINT64                  *Value,
    void                    *HandlerContext,
    void                    *RegionContext)
{
    ACPI_STATUS             Status = AE_OK;
    void                    *LogicalAddrPtr = NULL;
    ACPI_MEM_SPACE_CONTEXT  *MemInfo = RegionContext;
    UINT32                  Length;
    ACPI_SIZE               MapLength;
    ACPI_SIZE               PageBoundaryMapLength;
#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
    UINT32                  Remainder;
#endif


    ACPI_FUNCTION_TRACE (ExSystemMemorySpaceHandler);


    /* Validate and translate the bit width */

    switch (BitWidth)
    {
    case 8:
        Length = 1;
        break;

    case 16:
        Length = 2;
        break;

    case 32:
        Length = 4;
        break;

    case 64:
        Length = 8;
        break;

    default:
        ACPI_ERROR ((AE_INFO, "Invalid SystemMemory width %u",
            BitWidth));
        return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
    }

#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
    /*
     * Hardware does not support non-aligned data transfers, we must verify
     * the request.
     */
    (void) AcpiUtShortDivide ((UINT64) Address, Length, NULL, &Remainder);
    if (Remainder != 0)
    {
        return_ACPI_STATUS (AE_AML_ALIGNMENT);
    }
#endif

    /*
     * Does the request fit into the cached memory mapping?
     * Is 1) Address below the current mapping? OR
     *    2) Address beyond the current mapping?
     */
    if ((Address < MemInfo->MappedPhysicalAddress) ||
        (((UINT64) Address + Length) >
            ((UINT64)
            MemInfo->MappedPhysicalAddress + MemInfo->MappedLength)))
    {
        /*
         * The request cannot be resolved by the current memory mapping;
         * Delete the existing mapping and create a new one.
         */
        if (MemInfo->MappedLength)
        {
            /* Valid mapping, delete it */

            AcpiOsUnmapMemory (MemInfo->MappedLogicalAddress,
                MemInfo->MappedLength);
        }

        /*
         * October 2009: Attempt to map from the requested address to the
         * end of the region. However, we will never map more than one
         * page, nor will we cross a page boundary.
         */
        MapLength = (ACPI_SIZE)
            ((MemInfo->Address + MemInfo->Length) - Address);

        /*
         * If mapping the entire remaining portion of the region will cross
         * a page boundary, just map up to the page boundary, do not cross.
         * On some systems, crossing a page boundary while mapping regions
         * can cause warnings if the pages have different attributes
         * due to resource management.
         *
         * This has the added benefit of constraining a single mapping to
         * one page, which is similar to the original code that used a 4k
         * maximum window.
         */
        PageBoundaryMapLength =
            ACPI_ROUND_UP (Address, ACPI_DEFAULT_PAGE_SIZE) - Address;
        if (PageBoundaryMapLength == 0)
        {
            PageBoundaryMapLength = ACPI_DEFAULT_PAGE_SIZE;
        }

        if (MapLength > PageBoundaryMapLength)
        {
            MapLength = PageBoundaryMapLength;
        }

        /* Create a new mapping starting at the address given */

        MemInfo->MappedLogicalAddress = AcpiOsMapMemory (
            (ACPI_PHYSICAL_ADDRESS) Address, MapLength);
        if (!MemInfo->MappedLogicalAddress)
        {
            ACPI_ERROR ((AE_INFO,
                "Could not map memory at 0x%8.8X%8.8X, size %u",
                ACPI_FORMAT_NATIVE_UINT (Address), (UINT32) MapLength));
            MemInfo->MappedLength = 0;
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        /* Save the physical address and mapping size */

        MemInfo->MappedPhysicalAddress = Address;
        MemInfo->MappedLength = MapLength;
    }

    /*
     * Generate a logical pointer corresponding to the address we want to
     * access
     */
    LogicalAddrPtr = MemInfo->MappedLogicalAddress +
        ((UINT64) Address - (UINT64) MemInfo->MappedPhysicalAddress);

    ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
        "System-Memory (width %u) R/W %u Address=%8.8X%8.8X\n",
        BitWidth, Function, ACPI_FORMAT_NATIVE_UINT (Address)));

    /*
     * Perform the memory read or write
     *
     * Note: For machines that do not support non-aligned transfers, the target
     * address was checked for alignment above.  We do not attempt to break the
     * transfer up into smaller (byte-size) chunks because the AML specifically
     * asked for a transfer width that the hardware may require.
     */
    switch (Function)
    {
    case ACPI_READ:

        *Value = 0;
        switch (BitWidth)
        {
        case 8:
            *Value = (UINT64) ACPI_GET8 (LogicalAddrPtr);
            break;

        case 16:
            *Value = (UINT64) ACPI_GET16 (LogicalAddrPtr);
            break;

        case 32:
            *Value = (UINT64) ACPI_GET32 (LogicalAddrPtr);
            break;

        case 64:
            *Value = (UINT64) ACPI_GET64 (LogicalAddrPtr);
            break;

        default:
            /* BitWidth was already validated */
            break;
        }
        break;

    case ACPI_WRITE:

        switch (BitWidth)
        {
        case 8:
            ACPI_SET8 (LogicalAddrPtr) = (UINT8) *Value;
            break;

        case 16:
            ACPI_SET16 (LogicalAddrPtr) = (UINT16) *Value;
            break;

        case 32:
            ACPI_SET32 ( LogicalAddrPtr) = (UINT32) *Value;
            break;

        case 64:
            ACPI_SET64 (LogicalAddrPtr) = (UINT64) *Value;
            break;

        default:
            /* BitWidth was already validated */
            break;
        }
        break;

    default:
        Status = AE_BAD_PARAMETER;
        break;
    }

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExSystemIoSpaceHandler
 *
 * PARAMETERS:  Function            - Read or Write operation
 *              Address             - Where in the space to read or write
 *              BitWidth            - Field width in bits (8, 16, or 32)
 *              Value               - Pointer to in or out value
 *              HandlerContext      - Pointer to Handler's context
 *              RegionContext       - Pointer to context specific to the
 *                                    accessed region
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handler for the System IO address space (Op Region)
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExSystemIoSpaceHandler (
    UINT32                  Function,
    ACPI_PHYSICAL_ADDRESS   Address,
    UINT32                  BitWidth,
    UINT64                  *Value,
    void                    *HandlerContext,
    void                    *RegionContext)
{
    ACPI_STATUS             Status = AE_OK;
    UINT32                  Value32;


    ACPI_FUNCTION_TRACE (ExSystemIoSpaceHandler);


    ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
        "System-IO (width %u) R/W %u Address=%8.8X%8.8X\n",
        BitWidth, Function, ACPI_FORMAT_NATIVE_UINT (Address)));

    /* Decode the function parameter */

    switch (Function)
    {
    case ACPI_READ:

        Status = AcpiHwReadPort ((ACPI_IO_ADDRESS) Address,
                    &Value32, BitWidth);
        *Value = Value32;
        break;

    case ACPI_WRITE:

        Status = AcpiHwWritePort ((ACPI_IO_ADDRESS) Address,
                    (UINT32) *Value, BitWidth);
        break;

    default:
        Status = AE_BAD_PARAMETER;
        break;
    }

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExPciConfigSpaceHandler
 *
 * PARAMETERS:  Function            - Read or Write operation
 *              Address             - Where in the space to read or write
 *              BitWidth            - Field width in bits (8, 16, or 32)
 *              Value               - Pointer to in or out value
 *              HandlerContext      - Pointer to Handler's context
 *              RegionContext       - Pointer to context specific to the
 *                                    accessed region
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handler for the PCI Config address space (Op Region)
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExPciConfigSpaceHandler (
    UINT32                  Function,
    ACPI_PHYSICAL_ADDRESS   Address,
    UINT32                  BitWidth,
    UINT64                  *Value,
    void                    *HandlerContext,
    void                    *RegionContext)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_PCI_ID             *PciId;
    UINT16                  PciRegister;


    ACPI_FUNCTION_TRACE (ExPciConfigSpaceHandler);


    /*
     *  The arguments to AcpiOs(Read|Write)PciConfiguration are:
     *
     *  PciSegment  is the PCI bus segment range 0-31
     *  PciBus      is the PCI bus number range 0-255
     *  PciDevice   is the PCI device number range 0-31
     *  PciFunction is the PCI device function number
     *  PciRegister is the Config space register range 0-255 bytes
     *
     *  Value - input value for write, output address for read
     *
     */
    PciId       = (ACPI_PCI_ID *) RegionContext;
    PciRegister = (UINT16) (UINT32) Address;

    ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
        "Pci-Config %u (%u) Seg(%04x) Bus(%04x) Dev(%04x) Func(%04x) Reg(%04x)\n",
        Function, BitWidth, PciId->Segment, PciId->Bus, PciId->Device,
        PciId->Function, PciRegister));

    switch (Function)
    {
    case ACPI_READ:

        *Value = 0;
        Status = AcpiOsReadPciConfiguration (PciId, PciRegister,
                    Value, BitWidth);
        break;

    case ACPI_WRITE:

        Status = AcpiOsWritePciConfiguration (PciId, PciRegister,
                    *Value, BitWidth);
        break;

    default:

        Status = AE_BAD_PARAMETER;
        break;
    }

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExCmosSpaceHandler
 *
 * PARAMETERS:  Function            - Read or Write operation
 *              Address             - Where in the space to read or write
 *              BitWidth            - Field width in bits (8, 16, or 32)
 *              Value               - Pointer to in or out value
 *              HandlerContext      - Pointer to Handler's context
 *              RegionContext       - Pointer to context specific to the
 *                                    accessed region
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handler for the CMOS address space (Op Region)
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExCmosSpaceHandler (
    UINT32                  Function,
    ACPI_PHYSICAL_ADDRESS   Address,
    UINT32                  BitWidth,
    UINT64                  *Value,
    void                    *HandlerContext,
    void                    *RegionContext)
{
    ACPI_STATUS             Status = AE_OK;


    ACPI_FUNCTION_TRACE (ExCmosSpaceHandler);


    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExPciBarSpaceHandler
 *
 * PARAMETERS:  Function            - Read or Write operation
 *              Address             - Where in the space to read or write
 *              BitWidth            - Field width in bits (8, 16, or 32)
 *              Value               - Pointer to in or out value
 *              HandlerContext      - Pointer to Handler's context
 *              RegionContext       - Pointer to context specific to the
 *                                    accessed region
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handler for the PCI BarTarget address space (Op Region)
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExPciBarSpaceHandler (
    UINT32                  Function,
    ACPI_PHYSICAL_ADDRESS   Address,
    UINT32                  BitWidth,
    UINT64                  *Value,
    void                    *HandlerContext,
    void                    *RegionContext)
{
    ACPI_STATUS             Status = AE_OK;


    ACPI_FUNCTION_TRACE (ExPciBarSpaceHandler);


    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExDataTableSpaceHandler
 *
 * PARAMETERS:  Function            - Read or Write operation
 *              Address             - Where in the space to read or write
 *              BitWidth            - Field width in bits (8, 16, or 32)
 *              Value               - Pointer to in or out value
 *              HandlerContext      - Pointer to Handler's context
 *              RegionContext       - Pointer to context specific to the
 *                                    accessed region
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handler for the Data Table address space (Op Region)
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExDataTableSpaceHandler (
    UINT32                  Function,
    ACPI_PHYSICAL_ADDRESS   Address,
    UINT32                  BitWidth,
    UINT64                  *Value,
    void                    *HandlerContext,
    void                    *RegionContext)
{
    ACPI_FUNCTION_TRACE (ExDataTableSpaceHandler);


    /*
     * Perform the memory read or write. The BitWidth was already
     * validated.
     */
    switch (Function)
    {
    case ACPI_READ:

        ACPI_MEMCPY (ACPI_CAST_PTR (char, Value), ACPI_PHYSADDR_TO_PTR (Address),
            ACPI_DIV_8 (BitWidth));
        break;

    case ACPI_WRITE:

        ACPI_MEMCPY (ACPI_PHYSADDR_TO_PTR (Address), ACPI_CAST_PTR (char, Value),
            ACPI_DIV_8 (BitWidth));
        break;

    default:

        return_ACPI_STATUS (AE_BAD_PARAMETER);
    }

    return_ACPI_STATUS (AE_OK);
}