C++ ACPI_FUNCTION_ENTRY函数代码示例

ACPI_STATUS
AcpiExSystemResetEvent (
    ACPI_OPERAND_OBJECT     *ObjDesc)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_SEMAPHORE          TempSemaphore;


    ACPI_FUNCTION_ENTRY ();


    /*
     * We are going to simply delete the existing semaphore and
     * create a new one!
     */
    Status = AcpiOsCreateSemaphore (ACPI_NO_UNIT_LIMIT, 0, &TempSemaphore);
    if (ACPI_SUCCESS (Status))
    {
        (void) AcpiOsDeleteSemaphore (ObjDesc->Event.OsSemaphore);
        ObjDesc->Event.OsSemaphore = TempSemaphore;
    }

    return (Status);
}

static acpi_status
acpi_ds_init_one_object(acpi_handle obj_handle,
			u32 level, void *context, void **return_value)
{
	struct acpi_init_walk_info *info =
	    (struct acpi_init_walk_info *)context;
	struct acpi_namespace_node *node =
	    (struct acpi_namespace_node *)obj_handle;
	acpi_status status;
	union acpi_operand_object *obj_desc;

	ACPI_FUNCTION_ENTRY();

	/*
	 * We are only interested in NS nodes owned by the table that
	 * was just loaded
	 */
	if (node->owner_id != info->owner_id) {
		return (AE_OK);
	}

	info->object_count++;

	/* And even then, we are only interested in a few object types */

	switch (acpi_ns_get_type(obj_handle)) {
	case ACPI_TYPE_REGION:

		status = acpi_ds_initialize_region(obj_handle);
		if (ACPI_FAILURE(status)) {
			ACPI_EXCEPTION((AE_INFO, status,
					"During Region initialization %p [%4.4s]",
					obj_handle,
					acpi_ut_get_node_name(obj_handle)));
		}

		info->op_region_count++;
		break;

	case ACPI_TYPE_METHOD:
		/*
		 * Auto-serialization support. We will examine each method that is
		 * not_serialized to determine if it creates any Named objects. If
		 * it does, it will be marked serialized to prevent problems if
		 * the method is entered by two or more threads and an attempt is
		 * made to create the same named object twice -- which results in
		 * an AE_ALREADY_EXISTS exception and method abort.
		 */
		info->method_count++;
		obj_desc = acpi_ns_get_attached_object(node);
		if (!obj_desc) {
			break;
		}

		/* Ignore if already serialized */

		if (obj_desc->method.info_flags & ACPI_METHOD_SERIALIZED) {
			info->serial_method_count++;
			break;
		}

		if (acpi_gbl_auto_serialize_methods) {

			/* Parse/scan method and serialize it if necessary */

			acpi_ds_auto_serialize_method(node, obj_desc);
			if (obj_desc->method.
			    info_flags & ACPI_METHOD_SERIALIZED) {

				/* Method was just converted to Serialized */

				info->serial_method_count++;
				info->serialized_method_count++;
				break;
			}
		}

		info->non_serial_method_count++;
		break;

	case ACPI_TYPE_DEVICE:

		info->device_count++;
		break;

	default:

		break;
	}

	/*
	 * We ignore errors from above, and always return OK, since
	 * we don't want to abort the walk on a single error.
	 */
	return (AE_OK);
}

acpi_integer
acpi_ex_do_math_op (
	u16                             opcode,
	acpi_integer                    operand0,
	acpi_integer                    operand1)
{

	ACPI_FUNCTION_ENTRY ();


	switch (opcode) {
	case AML_ADD_OP:                /* Add (Operand0, Operand1, Result) */

		return (operand0 + operand1);


	case AML_BIT_AND_OP:            /* And (Operand0, Operand1, Result) */

		return (operand0 & operand1);


	case AML_BIT_NAND_OP:           /* NAnd (Operand0, Operand1, Result) */

		return (~(operand0 & operand1));


	case AML_BIT_OR_OP:             /* Or (Operand0, Operand1, Result) */

		return (operand0 | operand1);


	case AML_BIT_NOR_OP:            /* NOr (Operand0, Operand1, Result) */

		return (~(operand0 | operand1));


	case AML_BIT_XOR_OP:            /* XOr (Operand0, Operand1, Result) */

		return (operand0 ^ operand1);


	case AML_MULTIPLY_OP:           /* Multiply (Operand0, Operand1, Result) */

		return (operand0 * operand1);


	case AML_SHIFT_LEFT_OP:         /* shift_left (Operand, shift_count, Result) */

		return (operand0 << operand1);


	case AML_SHIFT_RIGHT_OP:        /* shift_right (Operand, shift_count, Result) */

		return (operand0 >> operand1);


	case AML_SUBTRACT_OP:           /* Subtract (Operand0, Operand1, Result) */

		return (operand0 - operand1);

	default:

		return (0);
	}
}

ACPI_STATUS
AeInstallEarlyHandlers (
    void)
{
    ACPI_STATUS             Status;
    UINT32                  i;
    ACPI_HANDLE             Handle;


    ACPI_FUNCTION_ENTRY ();


    Status = AcpiInstallInterfaceHandler (AeInterfaceHandler);
    if (ACPI_FAILURE (Status))
    {
        printf ("Could not install interface handler, %s\n",
            AcpiFormatException (Status));
    }

    Status = AcpiInstallTableHandler (AeTableHandler, NULL);
    if (ACPI_FAILURE (Status))
    {
        printf ("Could not install table handler, %s\n",
            AcpiFormatException (Status));
    }

    Status = AcpiInstallExceptionHandler (AeExceptionHandler);
    if (ACPI_FAILURE (Status))
    {
        printf ("Could not install exception handler, %s\n",
            AcpiFormatException (Status));
    }

    /* Install global notify handlers */

    Status = AcpiInstallNotifyHandler (ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
        AeSystemNotifyHandler, NULL);
    if (ACPI_FAILURE (Status))
    {
        printf ("Could not install a global system notify handler, %s\n",
            AcpiFormatException (Status));
    }

    Status = AcpiInstallNotifyHandler (ACPI_ROOT_OBJECT, ACPI_DEVICE_NOTIFY,
        AeDeviceNotifyHandler, NULL);
    if (ACPI_FAILURE (Status))
    {
        printf ("Could not install a global notify handler, %s\n",
            AcpiFormatException (Status));
    }

    Status = AcpiGetHandle (NULL, "\\_SB", &Handle);
    if (ACPI_SUCCESS (Status))
    {
        Status = AcpiInstallNotifyHandler (Handle, ACPI_SYSTEM_NOTIFY,
            AeNotifyHandler1, NULL);
        if (ACPI_FAILURE (Status))
        {
            printf ("Could not install a notify handler, %s\n",
                AcpiFormatException (Status));
        }

        Status = AcpiRemoveNotifyHandler (Handle, ACPI_SYSTEM_NOTIFY,
            AeNotifyHandler1);
        if (ACPI_FAILURE (Status))
        {
            printf ("Could not remove a notify handler, %s\n",
                AcpiFormatException (Status));
        }

        Status = AcpiInstallNotifyHandler (Handle, ACPI_ALL_NOTIFY,
            AeNotifyHandler1, NULL);
        AE_CHECK_OK (AcpiInstallNotifyHandler, Status);

        Status = AcpiRemoveNotifyHandler (Handle, ACPI_ALL_NOTIFY,
            AeNotifyHandler1);
        AE_CHECK_OK (AcpiRemoveNotifyHandler, Status);

#if 0
        Status = AcpiInstallNotifyHandler (Handle, ACPI_ALL_NOTIFY,
            AeNotifyHandler1, NULL);
        if (ACPI_FAILURE (Status))
        {
            printf ("Could not install a notify handler, %s\n",
                AcpiFormatException (Status));
        }
#endif

        /* Install two handlers for _SB_ */

        Status = AcpiInstallNotifyHandler (Handle, ACPI_SYSTEM_NOTIFY,
            AeNotifyHandler1, ACPI_CAST_PTR (void, 0x01234567));

        Status = AcpiInstallNotifyHandler (Handle, ACPI_SYSTEM_NOTIFY,
            AeNotifyHandler2, ACPI_CAST_PTR (void, 0x89ABCDEF));

        /* Attempt duplicate handler installation, should fail */

        Status = AcpiInstallNotifyHandler (Handle, ACPI_SYSTEM_NOTIFY,
            AeNotifyHandler1, ACPI_CAST_PTR (void, 0x77777777));
//.........这里部分代码省略.........

static UINT32
AcpiExConvertToAscii (
    UINT64                  Integer,
    UINT16                  Base,
    UINT8                   *String,
    UINT8                   DataWidth)
{
    UINT64                  Digit;
    UINT32                  i;
    UINT32                  j;
    UINT32                  k = 0;
    UINT32                  HexLength;
    UINT32                  DecimalLength;
    UINT32                  Remainder;
    BOOLEAN                 SupressZeros;


    ACPI_FUNCTION_ENTRY ();


    switch (Base)
    {
    case 10:

        /* Setup max length for the decimal number */

        switch (DataWidth)
        {
        case 1:

            DecimalLength = ACPI_MAX8_DECIMAL_DIGITS;
            break;

        case 4:

            DecimalLength = ACPI_MAX32_DECIMAL_DIGITS;
            break;

        case 8:
        default:

            DecimalLength = ACPI_MAX64_DECIMAL_DIGITS;
            break;
        }

        SupressZeros = TRUE;     /* No leading zeros */
        Remainder = 0;

        for (i = DecimalLength; i > 0; i--)
        {
            /* Divide by nth factor of 10 */

            Digit = Integer;
            for (j = 0; j < i; j++)
            {
                (void) AcpiUtShortDivide (Digit, 10, &Digit, &Remainder);
            }

            /* Handle leading zeros */

            if (Remainder != 0)
            {
                SupressZeros = FALSE;
            }

            if (!SupressZeros)
            {
                String[k] = (UINT8) (ACPI_ASCII_ZERO + Remainder);
                k++;
            }
        }
        break;

    case 16:

        /* HexLength: 2 ascii hex chars per data byte */

        HexLength = ACPI_MUL_2 (DataWidth);
        for (i = 0, j = (HexLength-1); i < HexLength; i++, j--)
        {
            /* Get one hex digit, most significant digits first */

            String[k] = (UINT8) AcpiUtHexToAsciiChar (Integer, ACPI_MUL_4 (j));
            k++;
        }
        break;

    default:
        return (0);
    }

    /*
     * Since leading zeros are suppressed, we must check for the case where
     * the integer equals 0
     *
     * Finally, null terminate the string and return the length
     */
    if (!k)
    {
        String [0] = ACPI_ASCII_ZERO;
//.........这里部分代码省略.........

ACPI_STATUS
AcpiDbSecondPassParse (
    ACPI_PARSE_OBJECT       *Root)
{
    ACPI_PARSE_OBJECT       *Op = Root;
    ACPI_PARSE_OBJECT       *Method;
    ACPI_PARSE_OBJECT       *SearchOp;
    ACPI_PARSE_OBJECT       *StartOp;
    ACPI_STATUS             Status = AE_OK;
    UINT32                  BaseAmlOffset;
    ACPI_WALK_STATE         *WalkState;


    ACPI_FUNCTION_ENTRY ();


    AcpiOsPrintf ("Pass two parse ....\n");

    while (Op)
    {
        if (Op->Common.AmlOpcode == AML_METHOD_OP)
        {
            Method = Op;

            /* Create a new walk state for the parse */

            WalkState = AcpiDsCreateWalkState (0, NULL, NULL, NULL);
            if (!WalkState)
            {
                return (AE_NO_MEMORY);
            }

            /* Init the Walk State */

            WalkState->ParserState.Aml          =
            WalkState->ParserState.AmlStart     = Method->Named.Data;
            WalkState->ParserState.AmlEnd       =
            WalkState->ParserState.PkgEnd       = Method->Named.Data +
                                                  Method->Named.Length;
            WalkState->ParserState.StartScope   = Op;

            WalkState->DescendingCallback       = AcpiDsLoad1BeginOp;
            WalkState->AscendingCallback        = AcpiDsLoad1EndOp;

            /* Perform the AML parse */

            Status = AcpiPsParseAml (WalkState);

            BaseAmlOffset = (Method->Common.Value.Arg)->Common.AmlOffset + 1;
            StartOp = (Method->Common.Value.Arg)->Common.Next;
            SearchOp = StartOp;

            while (SearchOp)
            {
                SearchOp->Common.AmlOffset += BaseAmlOffset;
                SearchOp = AcpiPsGetDepthNext (StartOp, SearchOp);
            }
        }

        if (Op->Common.AmlOpcode == AML_REGION_OP)
        {
            /* TBD: [Investigate] this isn't quite the right thing to do! */
            /*
             *
             * Method = (ACPI_DEFERRED_OP *) Op;
             * Status = AcpiPsParseAml (Op, Method->Body, Method->BodyLength);
             */
        }

        if (ACPI_FAILURE (Status))
        {
            break;
        }

        Op = AcpiPsGetDepthNext (Root, Op);
    }

    return (Status);
}

ACPI_STATUS
AcpiDmParseDeferredOps (
    ACPI_PARSE_OBJECT       *Root)
{
    const ACPI_OPCODE_INFO  *OpInfo;
    ACPI_PARSE_OBJECT       *Op = Root;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_ENTRY ();


    /* Traverse the entire parse tree */

    while (Op)
    {
        OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
        if (!(OpInfo->Flags & AML_DEFER))
        {
            Op = AcpiPsGetDepthNext (Root, Op);
            continue;
        }

        /* Now we know we have a deferred opcode */

        switch (Op->Common.AmlOpcode)
        {
        case AML_METHOD_OP:
        case AML_BUFFER_OP:
        case AML_PACKAGE_OP:
        case AML_VAR_PACKAGE_OP:

            Status = AcpiDmDeferredParse (Op, Op->Named.Data, Op->Named.Length);
            if (ACPI_FAILURE (Status))
            {
                return (Status);
            }
            break;

        /* We don't need to do anything for these deferred opcodes */

        case AML_REGION_OP:
        case AML_DATA_REGION_OP:
        case AML_CREATE_QWORD_FIELD_OP:
        case AML_CREATE_DWORD_FIELD_OP:
        case AML_CREATE_WORD_FIELD_OP:
        case AML_CREATE_BYTE_FIELD_OP:
        case AML_CREATE_BIT_FIELD_OP:
        case AML_CREATE_FIELD_OP:
        case AML_BANK_FIELD_OP:

            break;

        default:

            ACPI_ERROR ((AE_INFO, "Unhandled deferred AML opcode [0x%.4X]",
                 Op->Common.AmlOpcode));
            break;
        }

        Op = AcpiPsGetDepthNext (Root, Op);
    }

    return (AE_OK);
}

static u32
acpi_ex_convert_to_ascii(acpi_integer integer,
			 u16 base, u8 * string, u8 data_width)
{
	acpi_integer digit;
	acpi_native_uint i;
	acpi_native_uint j;
	acpi_native_uint k = 0;
	acpi_native_uint hex_length;
	acpi_native_uint decimal_length;
	u32 remainder;
	u8 supress_zeros;

	ACPI_FUNCTION_ENTRY();

	switch (base) {
	case 10:

		/* Setup max length for the decimal number */

		switch (data_width) {
		case 1:
			decimal_length = ACPI_MAX8_DECIMAL_DIGITS;
			break;

		case 4:
			decimal_length = ACPI_MAX32_DECIMAL_DIGITS;
			break;

		case 8:
		default:
			decimal_length = ACPI_MAX64_DECIMAL_DIGITS;
			break;
		}

		supress_zeros = TRUE;	/* No leading zeros */
		remainder = 0;

		for (i = decimal_length; i > 0; i--) {

			/* Divide by nth factor of 10 */

			digit = integer;
			for (j = 0; j < i; j++) {
				(void)acpi_ut_short_divide(digit, 10, &digit,
							   &remainder);
			}

			/* Handle leading zeros */

			if (remainder != 0) {
				supress_zeros = FALSE;
			}

			if (!supress_zeros) {
				string[k] = (u8) (ACPI_ASCII_ZERO + remainder);
				k++;
			}
		}
		break;

	case 16:

		/* hex_length: 2 ascii hex chars per data byte */

		hex_length = (acpi_native_uint) ACPI_MUL_2(data_width);
		for (i = 0, j = (hex_length - 1); i < hex_length; i++, j--) {

			/* Get one hex digit, most significant digits first */

			string[k] =
			    (u8) acpi_ut_hex_to_ascii_char(integer,
							   ACPI_MUL_4(j));
			k++;
		}
		break;

	default:
		return (0);
	}

	/*
	 * Since leading zeros are supressed, we must check for the case where
	 * the integer equals 0
	 *
	 * Finally, null terminate the string and return the length
	 */
	if (!k) {
		string[0] = ACPI_ASCII_ZERO;
		k = 1;
	}

	string[k] = 0;
	return ((u32) k);
}

ACPI_STATUS
AcpiHwGetGpeStatus (
    ACPI_GPE_EVENT_INFO     *GpeEventInfo,
    ACPI_EVENT_STATUS       *EventStatus)
{
    UINT32                  InByte;
    UINT32                  RegisterBit;
    ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo;
    ACPI_EVENT_STATUS       LocalEventStatus = 0;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_ENTRY ();


    if (!EventStatus)
    {
        return (AE_BAD_PARAMETER);
    }

    /* GPE currently handled? */

    if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) !=
            ACPI_GPE_DISPATCH_NONE)
    {
        LocalEventStatus |= ACPI_EVENT_FLAG_HAS_HANDLER;
    }

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

    GpeRegisterInfo = GpeEventInfo->RegisterInfo;

    /* Get the register bitmask for this GPE */

    RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo);

    /* GPE currently enabled? (enabled for runtime?) */

    if (RegisterBit & GpeRegisterInfo->EnableForRun)
    {
        LocalEventStatus |= ACPI_EVENT_FLAG_ENABLED;
    }

    /* GPE enabled for wake? */

    if (RegisterBit & GpeRegisterInfo->EnableForWake)
    {
        LocalEventStatus |= ACPI_EVENT_FLAG_WAKE_ENABLED;
    }

    /* GPE currently enabled (enable bit == 1)? */

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

    if (RegisterBit & InByte)
    {
        LocalEventStatus |= ACPI_EVENT_FLAG_ENABLE_SET;
    }

    /* GPE currently active (status bit == 1)? */

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

    if (RegisterBit & InByte)
    {
        LocalEventStatus |= ACPI_EVENT_FLAG_STATUS_SET;
    }

    /* Set return value */

    (*EventStatus) = LocalEventStatus;
    return (AE_OK);
}

ACPI_STATUS
AcpiGetHandle (
    ACPI_HANDLE             Parent,
    ACPI_STRING             Pathname,
    ACPI_HANDLE             *RetHandle)
{
    ACPI_STATUS             Status;
    ACPI_NAMESPACE_NODE     *Node = NULL;
    ACPI_NAMESPACE_NODE     *PrefixNode = NULL;


    ACPI_FUNCTION_ENTRY ();


    /* Parameter Validation */

    if (!RetHandle || !Pathname)
    {
        return (AE_BAD_PARAMETER);
    }

    /* Convert a parent handle to a prefix node */

    if (Parent)
    {
        PrefixNode = AcpiNsMapHandleToNode (Parent);
        if (!PrefixNode)
        {
            return (AE_BAD_PARAMETER);
        }
    }

    /*
     * Valid cases are:
     * 1) Fully qualified pathname
     * 2) Parent + Relative pathname
     *
     * Error for <null Parent + relative path>
     */
    if (AcpiNsValidRootPrefix (Pathname[0]))
    {
        /* Pathname is fully qualified (starts with '\') */

        /* Special case for root-only, since we can't search for it */

        if (!ACPI_STRCMP (Pathname, ACPI_NS_ROOT_PATH))
        {
            *RetHandle = AcpiNsConvertEntryToHandle (AcpiGbl_RootNode);
            return (AE_OK);
        }
    }
    else if (!PrefixNode)
    {
        /* Relative path with null prefix is disallowed */

        return (AE_BAD_PARAMETER);
    }

    /* Find the Node and convert to a handle */

    Status = AcpiNsGetNode (PrefixNode, Pathname, ACPI_NS_NO_UPSEARCH, &Node);
    if (ACPI_SUCCESS (Status))
    {
        *RetHandle = AcpiNsConvertEntryToHandle (Node);
    }

    return (Status);
}

ACPI_PARSE_OBJECT *
AcpiPsGetDepthNext (
    ACPI_PARSE_OBJECT       *Origin,
    ACPI_PARSE_OBJECT       *Op)
{
    ACPI_PARSE_OBJECT       *Next = NULL;
    ACPI_PARSE_OBJECT       *Parent;
    ACPI_PARSE_OBJECT       *Arg;


    ACPI_FUNCTION_ENTRY ();


    if (!Op)
    {
        return (NULL);
    }

    /* Look for an argument or child */

    Next = AcpiPsGetArg (Op, 0);
    if (Next)
    {
        return (Next);
    }

    /* Look for a sibling */

    Next = Op->Common.Next;
    if (Next)
    {
        return (Next);
    }

    /* Look for a sibling of parent */

    Parent = Op->Common.Parent;

    while (Parent)
    {
        Arg = AcpiPsGetArg (Parent, 0);
        while (Arg && (Arg != Origin) && (Arg != Op))
        {
            Arg = Arg->Common.Next;
        }

        if (Arg == Origin)
        {
            /* Reached parent of origin, end search */

            return (NULL);
        }

        if (Parent->Common.Next)
        {
            /* Found sibling of parent */

            return (Parent->Common.Next);
        }

        Op = Parent;
        Parent = Parent->Common.Parent;
    }

    return (Next);
}

void
AcpiPsAppendArg (
    ACPI_PARSE_OBJECT       *Op,
    ACPI_PARSE_OBJECT       *Arg)
{
    ACPI_PARSE_OBJECT       *PrevArg;
    const ACPI_OPCODE_INFO  *OpInfo;


    ACPI_FUNCTION_ENTRY ();


    if (!Op)
    {
        return;
    }

    /* Get the info structure for this opcode */

    OpInfo = AcpiPsGetOpcodeInfo (Op->Common.AmlOpcode);
    if (OpInfo->Class == AML_CLASS_UNKNOWN)
    {
        /* Invalid opcode */

        ACPI_ERROR ((AE_INFO, "Invalid AML Opcode: 0x%2.2X",
            Op->Common.AmlOpcode));
        return;
    }

    /* Check if this opcode requires argument sub-objects */

    if (!(OpInfo->Flags & AML_HAS_ARGS))
    {
        /* Has no linked argument objects */

        return;
    }

    /* Append the argument to the linked argument list */

    if (Op->Common.Value.Arg)
    {
        /* Append to existing argument list */

        PrevArg = Op->Common.Value.Arg;
        while (PrevArg->Common.Next)
        {
            PrevArg = PrevArg->Common.Next;
        }
        PrevArg->Common.Next = Arg;
    }
    else
    {
        /* No argument list, this will be the first argument */

        Op->Common.Value.Arg = Arg;
    }

    /* Set the parent in this arg and any args linked after it */

    while (Arg)
    {
        Arg->Common.Parent = Op;
        Arg = Arg->Common.Next;

        Op->Common.ArgListLength++;
    }
}

ACPI_STATUS
AcpiHwGetGpeStatus (
    ACPI_GPE_EVENT_INFO     *GpeEventInfo,
    ACPI_EVENT_STATUS       *EventStatus)
{
    UINT32                  InByte;
    UINT8                   RegisterBit;
    ACPI_GPE_REGISTER_INFO  *GpeRegisterInfo;
    ACPI_STATUS             Status;
    ACPI_EVENT_STATUS       LocalEventStatus = 0;


    ACPI_FUNCTION_ENTRY ();


    if (!EventStatus)
    {
        return (AE_BAD_PARAMETER);
    }

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

    GpeRegisterInfo = GpeEventInfo->RegisterInfo;

    /* Get the register bitmask for this GPE */

    RegisterBit = (UINT8) (1 <<
        (GpeEventInfo->GpeNumber - GpeEventInfo->RegisterInfo->BaseGpeNumber));

    /* GPE currently enabled? (enabled for runtime?) */

    if (RegisterBit & GpeRegisterInfo->EnableForRun)
    {
        LocalEventStatus |= ACPI_EVENT_FLAG_ENABLED;
    }

    /* GPE enabled for wake? */

    if (RegisterBit & GpeRegisterInfo->EnableForWake)
    {
        LocalEventStatus |= ACPI_EVENT_FLAG_WAKE_ENABLED;
    }

    /* GPE currently active (status bit == 1)? */

    Status = AcpiRead (&InByte, &GpeRegisterInfo->StatusAddress);
    if (ACPI_FAILURE (Status))
    {
        goto UnlockAndExit;
    }

    if (RegisterBit & InByte)
    {
        LocalEventStatus |= ACPI_EVENT_FLAG_SET;
    }

    /* Set return value */

    (*EventStatus) = LocalEventStatus;


UnlockAndExit:
    return (Status);
}

UINT64
AcpiExDoMathOp (
    UINT16                  Opcode,
    UINT64                  Integer0,
    UINT64                  Integer1)
{

    ACPI_FUNCTION_ENTRY ();


    switch (Opcode)
    {
    case AML_ADD_OP:                /* Add (Integer0, Integer1, Result) */

        return (Integer0 + Integer1);

    case AML_BIT_AND_OP:            /* And (Integer0, Integer1, Result) */

        return (Integer0 & Integer1);

    case AML_BIT_NAND_OP:           /* NAnd (Integer0, Integer1, Result) */

        return (~(Integer0 & Integer1));

    case AML_BIT_OR_OP:             /* Or (Integer0, Integer1, Result) */

        return (Integer0 | Integer1);

    case AML_BIT_NOR_OP:            /* NOr (Integer0, Integer1, Result) */

        return (~(Integer0 | Integer1));

    case AML_BIT_XOR_OP:            /* XOr (Integer0, Integer1, Result) */

        return (Integer0 ^ Integer1);

    case AML_MULTIPLY_OP:           /* Multiply (Integer0, Integer1, Result) */

        return (Integer0 * Integer1);

    case AML_SHIFT_LEFT_OP:         /* ShiftLeft (Operand, ShiftCount, Result)*/

        /*
         * We need to check if the shiftcount is larger than the integer bit
         * width since the behavior of this is not well-defined in the C language.
         */
        if (Integer1 >= AcpiGbl_IntegerBitWidth)
        {
            return (0);
        }
        return (Integer0 << Integer1);

    case AML_SHIFT_RIGHT_OP:        /* ShiftRight (Operand, ShiftCount, Result) */

        /*
         * We need to check if the shiftcount is larger than the integer bit
         * width since the behavior of this is not well-defined in the C language.
         */
        if (Integer1 >= AcpiGbl_IntegerBitWidth)
        {
            return (0);
        }
        return (Integer0 >> Integer1);

    case AML_SUBTRACT_OP:           /* Subtract (Integer0, Integer1, Result) */

        return (Integer0 - Integer1);

    default:

        return (0);
    }
}

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);
}