exmisc.c

acpi tools for linux include acpiexec and acpixtract

            goto Cleanup;
        }

        NewBuf = ReturnDesc->String.Pointer;

        /* Concatenate the strings */

        ACPI_STRCPY (NewBuf, Operand0->String.Pointer);
        ACPI_STRCPY (NewBuf + Operand0->String.Length,
                        LocalOperand1->String.Pointer);
        break;

    case ACPI_TYPE_BUFFER:

        /* Result of two Buffers is a Buffer */

        ReturnDesc = AcpiUtCreateBufferObject ((ACPI_SIZE)
                        (Operand0->Buffer.Length +
                        LocalOperand1->Buffer.Length));
        if (!ReturnDesc)
        {
            Status = AE_NO_MEMORY;
            goto Cleanup;
        }

        NewBuf = (char *) ReturnDesc->Buffer.Pointer;

        /* Concatenate the buffers */

        ACPI_MEMCPY (NewBuf, Operand0->Buffer.Pointer,
                        Operand0->Buffer.Length);
        ACPI_MEMCPY (NewBuf + Operand0->Buffer.Length,
                        LocalOperand1->Buffer.Pointer,
                        LocalOperand1->Buffer.Length);
        break;

    default:

        /* Invalid object type, should not happen here */

        ACPI_ERROR ((AE_INFO, "Invalid object type: %X",
            ACPI_GET_OBJECT_TYPE (Operand0)));
        Status =AE_AML_INTERNAL;
        goto Cleanup;
    }

    *ActualReturnDesc = ReturnDesc;

Cleanup:
    if (LocalOperand1 != Operand1)
    {
        AcpiUtRemoveReference (LocalOperand1);
    }
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExDoMathOp
 *
 * PARAMETERS:  Opcode              - AML opcode
 *              Integer0            - Integer operand #0
 *              Integer1            - Integer operand #1
 *
 * RETURN:      Integer result of the operation
 *
 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
 *              math functions here is to prevent a lot of pointer dereferencing
 *              to obtain the operands.
 *
 ******************************************************************************/

ACPI_INTEGER
AcpiExDoMathOp (
    UINT16                  Opcode,
    ACPI_INTEGER            Integer0,
    ACPI_INTEGER            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);
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExDoLogicalNumericOp
 *
 * PARAMETERS:  Opcode              - AML opcode
 *              Integer0            - Integer operand #0
 *              Integer1            - Integer operand #1
 *              LogicalResult       - TRUE/FALSE result of the operation
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
 *              operators (LAnd and LOr), both operands must be integers.
 *
 *              Note: cleanest machine code seems to be produced by the code
 *              below, rather than using statements of the form:
 *                  Result = (Integer0 && Integer1);
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExDoLogicalNumericOp (
    UINT16                  Opcode,
    ACPI_INTEGER            Integer0,
    ACPI_INTEGER            Integer1,
    BOOLEAN                 *LogicalResult)
{
    ACPI_STATUS             Status = AE_OK;
    BOOLEAN                 LocalResult = FALSE;


    ACPI_FUNCTION_TRACE (ExDoLogicalNumericOp);


    switch (Opcode)
    {
    case AML_LAND_OP:               /* LAnd (Integer0, Integer1) */

        if (Integer0 && Integer1)
        {
            LocalResult = TRUE;
        }
        break;

    case AML_LOR_OP:                /* LOr (Integer0, Integer1) */

        if (Integer0 || Integer1)
        {
            LocalResult = TRUE;
        }
        break;

    default:
        Status = AE_AML_INTERNAL;
        break;
    }

    /* Return the logical result and status */

    *LogicalResult = LocalResult;
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExDoLogicalOp
 *
 * PARAMETERS:  Opcode              - AML opcode
 *              Operand0            - operand #0
 *              Operand1            - operand #1
 *              LogicalResult       - TRUE/FALSE result of the operation
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
 *              functions here is to prevent a lot of pointer dereferencing
 *              to obtain the operands and to simplify the generation of the
 *              logical value. For the Numeric operators (LAnd and LOr), both
 *              operands must be integers. For the other logical operators,
 *              operands can be any combination of Integer/String/Buffer. The
 *              first operand determines the type to which the second operand
 *              will be converted.
 *
 *              Note: cleanest machine code seems to be produced by the code
 *              below, rather than using statements of the form:
 *                  Result = (Operand0 == Operand1);
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExDoLogicalOp (
    UINT16                  Opcode,
    ACPI_OPERAND_OBJECT     *Operand0,
    ACPI_OPERAND_OBJECT     *Operand1,
    BOOLEAN                 *LogicalResult)
{
    ACPI_OPERAND_OBJECT     *LocalOperand1 = Operand1;
    ACPI_INTEGER            Integer0;
    ACPI_INTEGER            Integer1;
    UINT32                  Length0;
    UINT32                  Length1;
    ACPI_STATUS             Status = AE_OK;
    BOOLEAN                 LocalResult = FALSE;
    int                     Compare;


    ACPI_FUNCTION_TRACE (ExDoLogicalOp);


    /*
     * Convert the second operand if necessary.  The first operand
     * determines the type of the second operand, (See the Data Types
     * section of the ACPI 3.0+ specification.)  Both object types are
     * guaranteed to be either Integer/String/Buffer by the operand
     * resolution mechanism.
     */
    switch (ACPI_GET_OBJECT_TYPE (Operand0))
    {
    case ACPI_TYPE_INTEGER:
        Status = AcpiExConvertToInteger (Operand1, &LocalOperand1, 16);
        break;

    case ACPI_TYPE_STRING:
        Status = AcpiExConvertToString (Operand1, &LocalOperand1,
                    ACPI_IMPLICIT_CONVERT_HEX);
        break;

    case ACPI_TYPE_BUFFER:
        Status = AcpiExConvertToBuffer (Operand1, &LocalOperand1);
        break;

    default:
        Status = AE_AML_INTERNAL;
        break;
    }

    if (ACPI_FAILURE (Status))
    {
        goto Cleanup;
    }

    /*
     * Two cases: 1) Both Integers, 2) Both Strings or Buffers
     */
    if (ACPI_GET_OBJECT_TYPE (Operand0) == ACPI_TYPE_INTEGER)
    {
        /*
         * 1) Both operands are of type integer
         *    Note: LocalOperand1 may have changed above
         */
        Integer0 = Operand0->Integer.Value;
        Integer1 = LocalOperand1->Integer.Value;

        switch (Opcode)
        {
        case AML_LEQUAL_OP:             /* LEqual (Operand0, Operand1) */

            if (Integer0 == Integer1)
            {
                LocalResult = TRUE;
            }
            break;

        case AML_LGREATER_OP:           /* LGreater (Operand0, Operand1) */

            if (Integer0 > Integer1)
            {
                LocalResult = TRUE;
            }
            break;

        case AML_LLESS_OP:              /* LLess (Operand0, Operand1) */

            if (Integer0 < Integer1)
            {
                LocalResult = TRUE;
            }
            break;

        default:
            Status = AE_AML_INTERNAL;
            break;
        }
    }
    else
    {
        /*
         * 2) Both operands are Strings or both are Buffers
         *    Note: Code below takes advantage of common Buffer/String
         *          object fields. LocalOperand1 may have changed above. Use
         *          memcmp to handle nulls in buffers.
         */
        Length0 = Operand0->Buffer.Length;
        Length1 = LocalOperand1->Buffer.Length;

        /* Lexicographic compare: compare the data bytes */

        Compare = ACPI_MEMCMP (Operand0->Buffer.Pointer,
                    LocalOperand1->Buffer.Pointer,
                    (Length0 > Length1) ? Length1 : Length0);

        switch (Opcode)
        {
        case AML_LEQUAL_OP:             /* LEqual (Operand0, Operand1) */

            /* Length and all bytes must be equal */

            if ((Length0 == Length1) &&
                (Compare == 0))
            {
                /* Length and all bytes match ==> TRUE */

                LocalResult = TRUE;
            }
            break;

        case AML_LGREATER_OP:           /* LGreater (Operand0, Operand1) */

            if (Compare > 0)
            {
                LocalResult = TRUE;
                goto Cleanup;   /* TRUE */
            }
            if (Compare < 0)
            {
                goto Cleanup;   /* FALSE */
            }

            /* Bytes match (to shortest length), compare lengths */

            if (Length0 > Length1)
            {
                LocalResult = TRUE;
            }
            break;

        case AML_LLESS_OP:              /* LLess (Operand0, Operand1) */

            if (Compare > 0)
            {
                goto Cleanup;   /* FALSE */
            }
            if (Compare < 0)
            {
                LocalResult = TRUE;
                goto Cleanup;   /* TRUE */
            }

            /* Bytes match (to shortest length), compare lengths */

            if (Length0 < Length1)
            {
                LocalResult = TRUE;
            }
            break;

        default:
            Status = AE_AML_INTERNAL;
            break;
        }
    }

Cleanup:

    /* New object was created if implicit conversion performed - delete */

    if (LocalOperand1 != Operand1)
    {
        AcpiUtRemoveReference (LocalOperand1);
    }

    /* Return the logical result and status */

    *LogicalResult = LocalResult;
    return_ACPI_STATUS (Status);
}