ACPI_STATUS
AcpiHwEnableRuntimeGpeBlock (
    ACPI_GPE_XRUPT_INFO     *GpeXruptInfo,
    ACPI_GPE_BLOCK_INFO     *GpeBlock,
    void                    *Context)
{
    UINT32                  i;
    ACPI_STATUS             Status;


    /* NOTE: assumes that all GPEs are currently disabled */

    /* Examine each GPE Register within the block */

    for (i = 0; i < GpeBlock->RegisterCount; i++)
    {
        if (!GpeBlock->RegisterInfo[i].EnableForRun)
        {
            continue;
        }

        /* Enable all "runtime" GPEs in this register */

        Status = AcpiHwWrite (GpeBlock->RegisterInfo[i].EnableForRun,
                    &GpeBlock->RegisterInfo[i].EnableAddress);
        if (ACPI_FAILURE (Status))
        {
            return (Status);
        }
    }

    return (AE_OK);
}

static ACPI_STATUS
AcpiHwEnableWakeupGpeBlock (
    ACPI_GPE_XRUPT_INFO     *GpeXruptInfo,
    ACPI_GPE_BLOCK_INFO     *GpeBlock,
    void                    *Context)
{
    UINT32                  i;
    ACPI_STATUS             Status;


    /* Examine each GPE Register within the block */

    for (i = 0; i < GpeBlock->RegisterCount; i++)
    {
        if (!GpeBlock->RegisterInfo[i].EnableForWake)
        {
            continue;
        }

        /* Enable all "wake" GPEs in this register */

        Status = AcpiHwWrite (GpeBlock->RegisterInfo[i].EnableForWake,
                    &GpeBlock->RegisterInfo[i].EnableAddress);
        if (ACPI_FAILURE (Status))
        {
            return (Status);
        }
    }

    return (AE_OK);
}

ACPI_STATUS
AcpiHwClearGpe (
    ACPI_GPE_EVENT_INFO     *GpeEventInfo)
{
    ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo;
    ACPI_STATUS             Status;
    UINT32                  RegisterBit;


    ACPI_FUNCTION_ENTRY ();

    /* Get the info block for the entire GPE register */

    GpeRegisterInfo = GpeEventInfo->RegisterInfo;
    if (!GpeRegisterInfo)
    {
        return (AE_NOT_EXIST);
    }

    /*
     * Write a one to the appropriate bit in the status register to
     * clear this GPE.
     */
    RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo, GpeRegisterInfo);

    Status = AcpiHwWrite (RegisterBit,
                    &GpeRegisterInfo->StatusAddress);

    return (Status);
}

ACPI_STATUS
AcpiHwClearGpeBlock (
    ACPI_GPE_XRUPT_INFO     *GpeXruptInfo,
    ACPI_GPE_BLOCK_INFO     *GpeBlock,
    void                    *Context)
{
    UINT32                  i;
    ACPI_STATUS             Status;


    /* Examine each GPE Register within the block */

    for (i = 0; i < GpeBlock->RegisterCount; i++)
    {
        /* Clear status on all GPEs in this register */

        Status = AcpiHwWrite (0xFF, &GpeBlock->RegisterInfo[i].StatusAddress);
        if (ACPI_FAILURE (Status))
        {
            return (Status);
        }
    }

    return (AE_OK);
}

static ACPI_STATUS
AcpiHwGpeEnableWrite (
    UINT8                   EnableMask,
    ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo)
{
    ACPI_STATUS             Status;


    GpeRegisterInfo->EnableMask = EnableMask;

    Status = AcpiHwWrite (EnableMask, &GpeRegisterInfo->EnableAddress);
    return (Status);
}

ACPI_STATUS
AcpiHwWritePm1Control (
    UINT32                  Pm1aControl,
    UINT32                  Pm1bControl)
{
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (HwWritePm1Control);


    Status = AcpiHwWrite (Pm1aControl, &AcpiGbl_FADT.XPm1aControlBlock);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    if (AcpiGbl_FADT.XPm1bControlBlock.Address)
    {
        Status = AcpiHwWrite (Pm1bControl, &AcpiGbl_FADT.XPm1bControlBlock);
    }
    return_ACPI_STATUS (Status);
}

static ACPI_STATUS
AcpiHwWriteMultiple (
    UINT32                  Value,
    ACPI_GENERIC_ADDRESS    *RegisterA,
    ACPI_GENERIC_ADDRESS    *RegisterB)
{
    ACPI_STATUS             Status;


    /* The first register is always required */

    Status = AcpiHwWrite (Value, RegisterA);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /*
     * Second register is optional
     *
     * No bit shifting or clearing is necessary, because of how the PM1
     * registers are defined in the ACPI specification:
     *
     * "Although the bits can be split between the two register blocks (each
     * register block has a unique pointer within the FADT), the bit positions
     * are maintained. The register block with unimplemented bits (that is,
     * those implemented in the other register block) always returns zeros,
     * and writes have no side effects"
     */
    if (RegisterB->Address)
    {
        Status = AcpiHwWrite (Value, RegisterB);
    }

    return (Status);
}

static ACPI_STATUS
AcpiEvCreateGpeInfoBlocks (
    ACPI_GPE_BLOCK_INFO     *GpeBlock)
{
    ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo = NULL;
    ACPI_GPE_EVENT_INFO     *GpeEventInfo = NULL;
    ACPI_GPE_EVENT_INFO     *ThisEvent;
    ACPI_GPE_REGISTER_INFO  *ThisRegister;
    UINT32                  i;
    UINT32                  j;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_TRACE (EvCreateGpeInfoBlocks);


    /* Allocate the GPE register information block */

    GpeRegisterInfo = ACPI_ALLOCATE_ZEROED (
                        (ACPI_SIZE) GpeBlock->RegisterCount *
                        sizeof (ACPI_GPE_REGISTER_INFO));
    if (!GpeRegisterInfo)
    {
        ACPI_ERROR ((AE_INFO,
            "Could not allocate the GpeRegisterInfo table"));
        return_ACPI_STATUS (AE_NO_MEMORY);
    }

    /*
     * Allocate the GPE EventInfo block. There are eight distinct GPEs
     * per register. Initialization to zeros is sufficient.
     */
    GpeEventInfo = ACPI_ALLOCATE_ZEROED ((ACPI_SIZE) GpeBlock->GpeCount *
                    sizeof (ACPI_GPE_EVENT_INFO));
    if (!GpeEventInfo)
    {
        ACPI_ERROR ((AE_INFO,
            "Could not allocate the GpeEventInfo table"));
        Status = AE_NO_MEMORY;
        goto ErrorExit;
    }

    /* Save the new Info arrays in the GPE block */

    GpeBlock->RegisterInfo = GpeRegisterInfo;
    GpeBlock->EventInfo    = GpeEventInfo;

    /*
     * Initialize the GPE Register and Event structures. A goal of these
     * tables is to hide the fact that there are two separate GPE register
     * sets in a given GPE hardware block, the status registers occupy the
     * first half, and the enable registers occupy the second half.
     */
    ThisRegister = GpeRegisterInfo;
    ThisEvent    = GpeEventInfo;

    for (i = 0; i < GpeBlock->RegisterCount; i++)
    {
        /* Init the RegisterInfo for this GPE register (8 GPEs) */

        ThisRegister->BaseGpeNumber = (UINT16)
            (GpeBlock->BlockBaseNumber + (i * ACPI_GPE_REGISTER_WIDTH));

        ThisRegister->StatusAddress.Address =
            GpeBlock->Address + i;

        ThisRegister->EnableAddress.Address =
            GpeBlock->Address + i + GpeBlock->RegisterCount;

        ThisRegister->StatusAddress.SpaceId   = GpeBlock->SpaceId;
        ThisRegister->EnableAddress.SpaceId   = GpeBlock->SpaceId;
        ThisRegister->StatusAddress.BitWidth  = ACPI_GPE_REGISTER_WIDTH;
        ThisRegister->EnableAddress.BitWidth  = ACPI_GPE_REGISTER_WIDTH;
        ThisRegister->StatusAddress.BitOffset = 0;
        ThisRegister->EnableAddress.BitOffset = 0;

        /* Init the EventInfo for each GPE within this register */

        for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++)
        {
            ThisEvent->GpeNumber = (UINT8) (ThisRegister->BaseGpeNumber + j);
            ThisEvent->RegisterInfo = ThisRegister;
            ThisEvent++;
        }

        /* Disable all GPEs within this register */

        Status = AcpiHwWrite (0x00, &ThisRegister->EnableAddress);
        if (ACPI_FAILURE (Status))
        {
            goto ErrorExit;
        }

        /* Clear any pending GPE events within this register */

        Status = AcpiHwWrite (0xFF, &ThisRegister->StatusAddress);
        if (ACPI_FAILURE (Status))
        {
            goto ErrorExit;
        }
//.........这里部分代码省略.........

ACPI_STATUS
AcpiHwLowSetGpe (
    ACPI_GPE_EVENT_INFO     *GpeEventInfo,
    UINT32                  Action)
{
    ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo;
    ACPI_STATUS             Status;
    UINT32                  EnableMask;
    UINT32                  RegisterBit;


    ACPI_FUNCTION_ENTRY ();


    /* Get the info block for the entire GPE register */

    GpeRegisterInfo = GpeEventInfo->RegisterInfo;
    if (!GpeRegisterInfo)
    {
        return (AE_NOT_EXIST);
    }

    /* Get current value of the enable register that contains this GPE */

    Status = AcpiHwRead (&EnableMask, &GpeRegisterInfo->EnableAddress);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /* Set or clear just the bit that corresponds to this GPE */

    RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo, GpeRegisterInfo);
    switch (Action)
    {
    case ACPI_GPE_CONDITIONAL_ENABLE:

        /* Only enable if the EnableForRun bit is set */

        if (!(RegisterBit & GpeRegisterInfo->EnableForRun))
        {
            return (AE_BAD_PARAMETER);
        }

        /*lint -fallthrough */

    case ACPI_GPE_ENABLE:
        ACPI_SET_BIT (EnableMask, RegisterBit);
        break;

    case ACPI_GPE_DISABLE:
        ACPI_CLEAR_BIT (EnableMask, RegisterBit);
        break;

    default:
        ACPI_ERROR ((AE_INFO, "Invalid GPE Action, %u\n", Action));
        return (AE_BAD_PARAMETER);
    }

    /* Write the updated enable mask */

    Status = AcpiHwWrite (EnableMask, &GpeRegisterInfo->EnableAddress);
    return (Status);
}

ACPI_STATUS
AcpiHwRegisterWrite (
    UINT32                  RegisterId,
    UINT32                  Value)
{
    ACPI_STATUS             Status;
    UINT32                  ReadValue;


    ACPI_FUNCTION_TRACE (HwRegisterWrite);


    switch (RegisterId)
    {
    case ACPI_REGISTER_PM1_STATUS:           /* PM1 A/B: 16-bit access each */
        /*
         * Handle the "ignored" bit in PM1 Status. According to the ACPI
         * specification, ignored bits are to be preserved when writing.
         * Normally, this would mean a read/modify/write sequence. However,
         * preserving a bit in the status register is different. Writing a
         * one clears the status, and writing a zero preserves the status.
         * Therefore, we must always write zero to the ignored bit.
         *
         * This behavior is clarified in the ACPI 4.0 specification.
         */
        Value &= ~ACPI_PM1_STATUS_PRESERVED_BITS;

        Status = AcpiHwWriteMultiple (Value,
                    &AcpiGbl_XPm1aStatus,
                    &AcpiGbl_XPm1bStatus);
        break;

    case ACPI_REGISTER_PM1_ENABLE:           /* PM1 A/B: 16-bit access each */

        Status = AcpiHwWriteMultiple (Value,
                    &AcpiGbl_XPm1aEnable,
                    &AcpiGbl_XPm1bEnable);
        break;

    case ACPI_REGISTER_PM1_CONTROL:          /* PM1 A/B: 16-bit access each */
        /*
         * Perform a read first to preserve certain bits (per ACPI spec)
         * Note: This includes SCI_EN, we never want to change this bit
         */
        Status = AcpiHwReadMultiple (&ReadValue,
                    &AcpiGbl_FADT.XPm1aControlBlock,
                    &AcpiGbl_FADT.XPm1bControlBlock);
        if (ACPI_FAILURE (Status))
        {
            goto Exit;
        }

        /* Insert the bits to be preserved */

        ACPI_INSERT_BITS (Value, ACPI_PM1_CONTROL_PRESERVED_BITS, ReadValue);

        /* Now we can write the data */

        Status = AcpiHwWriteMultiple (Value,
                    &AcpiGbl_FADT.XPm1aControlBlock,
                    &AcpiGbl_FADT.XPm1bControlBlock);
        break;

    case ACPI_REGISTER_PM2_CONTROL:          /* 8-bit access */
        /*
         * For control registers, all reserved bits must be preserved,
         * as per the ACPI spec.
         */
        Status = AcpiHwRead (&ReadValue, &AcpiGbl_FADT.XPm2ControlBlock);
        if (ACPI_FAILURE (Status))
        {
            goto Exit;
        }

        /* Insert the bits to be preserved */

        ACPI_INSERT_BITS (Value, ACPI_PM2_CONTROL_PRESERVED_BITS, ReadValue);

        Status = AcpiHwWrite (Value, &AcpiGbl_FADT.XPm2ControlBlock);
        break;

    case ACPI_REGISTER_PM_TIMER:             /* 32-bit access */

        Status = AcpiHwWrite (Value, &AcpiGbl_FADT.XPmTimerBlock);
        break;

    case ACPI_REGISTER_SMI_COMMAND_BLOCK:    /* 8-bit access */

        /* SMI_CMD is currently always in IO space */

        Status = AcpiHwWritePort (AcpiGbl_FADT.SmiCommand, Value, 8);
        break;

    default:

        ACPI_ERROR ((AE_INFO, "Unknown Register ID: 0x%X",
            RegisterId));
        Status = AE_BAD_PARAMETER;
        break;
    }
//.........这里部分代码省略.........