exoparg2.c

acpi tools for linux include acpiexec and acpixtract

 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with two arguments, one target, and a return
 *              value.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExOpcode_2A_1T_1R (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
    ACPI_OPERAND_OBJECT     *ReturnDesc = NULL;
    ACPI_INTEGER            Index;
    ACPI_STATUS             Status = AE_OK;
    ACPI_SIZE               Length;


    ACPI_FUNCTION_TRACE_STR (ExOpcode_2A_1T_1R,
        AcpiPsGetOpcodeName (WalkState->Opcode));


    /* Execute the opcode */

    if (WalkState->OpInfo->Flags & AML_MATH)
    {
        /* All simple math opcodes (add, etc.) */

        ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
        if (!ReturnDesc)
        {
            Status = AE_NO_MEMORY;
            goto Cleanup;
        }

        ReturnDesc->Integer.Value = AcpiExDoMathOp (WalkState->Opcode,
                                                Operand[0]->Integer.Value,
                                                Operand[1]->Integer.Value);
        goto StoreResultToTarget;
    }

    switch (WalkState->Opcode)
    {
    case AML_MOD_OP: /* Mod (Dividend, Divisor, RemainderResult (ACPI 2.0) */

        ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
        if (!ReturnDesc)
        {
            Status = AE_NO_MEMORY;
            goto Cleanup;
        }

        /* ReturnDesc will contain the remainder */

        Status = AcpiUtDivide (Operand[0]->Integer.Value,
                               Operand[1]->Integer.Value,
                               NULL,
                               &ReturnDesc->Integer.Value);
        break;


    case AML_CONCAT_OP: /* Concatenate (Data1, Data2, Result) */

        Status = AcpiExDoConcatenate (Operand[0], Operand[1],
                    &ReturnDesc, WalkState);
        break;


    case AML_TO_STRING_OP: /* ToString (Buffer, Length, Result) (ACPI 2.0) */

        /*
         * Input object is guaranteed to be a buffer at this point (it may have
         * been converted.)  Copy the raw buffer data to a new object of
         * type String.
         */

        /*
         * Get the length of the new string. It is the smallest of:
         * 1) Length of the input buffer
         * 2) Max length as specified in the ToString operator
         * 3) Length of input buffer up to a zero byte (null terminator)
         *
         * NOTE: A length of zero is ok, and will create a zero-length, null
         *       terminated string.
         */
        Length = 0;
        while ((Length < Operand[0]->Buffer.Length) &&
               (Length < Operand[1]->Integer.Value) &&
               (Operand[0]->Buffer.Pointer[Length]))
        {
            Length++;
        }

        /* Allocate a new string object */

        ReturnDesc = AcpiUtCreateStringObject (Length);
        if (!ReturnDesc)
        {
            Status = AE_NO_MEMORY;
            goto Cleanup;
        }

        /*
         * Copy the raw buffer data with no transform.
         * (NULL terminated already)
         */
        ACPI_MEMCPY (ReturnDesc->String.Pointer,
            Operand[0]->Buffer.Pointer, Length);
        break;


    case AML_CONCAT_RES_OP:

        /* ConcatenateResTemplate (Buffer, Buffer, Result) (ACPI 2.0) */

        Status = AcpiExConcatTemplate (Operand[0], Operand[1],
                    &ReturnDesc, WalkState);
        break;


    case AML_INDEX_OP:              /* Index (Source Index Result) */

        /* Create the internal return object */

        ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_LOCAL_REFERENCE);
        if (!ReturnDesc)
        {
            Status = AE_NO_MEMORY;
            goto Cleanup;
        }

        /* Initialize the Index reference object */

        Index = Operand[1]->Integer.Value;
        ReturnDesc->Reference.Offset = (UINT32) Index;
        ReturnDesc->Reference.Opcode = AML_INDEX_OP;

        /*
         * At this point, the Source operand is a String, Buffer, or Package.
         * Verify that the index is within range.
         */
        switch (ACPI_GET_OBJECT_TYPE (Operand[0]))
        {
        case ACPI_TYPE_STRING:

            if (Index >= Operand[0]->String.Length)
            {
                Status = AE_AML_STRING_LIMIT;
            }

            ReturnDesc->Reference.TargetType = ACPI_TYPE_BUFFER_FIELD;
            break;

        case ACPI_TYPE_BUFFER:

            if (Index >= Operand[0]->Buffer.Length)
            {
                Status = AE_AML_BUFFER_LIMIT;
            }

            ReturnDesc->Reference.TargetType = ACPI_TYPE_BUFFER_FIELD;
            break;

        case ACPI_TYPE_PACKAGE:

            if (Index >= Operand[0]->Package.Count)
            {
                Status = AE_AML_PACKAGE_LIMIT;
            }

            ReturnDesc->Reference.TargetType = ACPI_TYPE_PACKAGE;
            ReturnDesc->Reference.Where = &Operand[0]->Package.Elements [Index];
            break;

        default:

            Status = AE_AML_INTERNAL;
            goto Cleanup;
        }

        /* Failure means that the Index was beyond the end of the object */

        if (ACPI_FAILURE (Status))
        {
            ACPI_EXCEPTION ((AE_INFO, Status,
                "Index (%X%8.8X) is beyond end of object",
                ACPI_FORMAT_UINT64 (Index)));
            goto Cleanup;
        }

        /*
         * Save the target object and add a reference to it for the life
         * of the index
         */
        ReturnDesc->Reference.Object = Operand[0];
        AcpiUtAddReference (Operand[0]);

        /* Store the reference to the Target */

        Status = AcpiExStore (ReturnDesc, Operand[2], WalkState);

        /* Return the reference */

        WalkState->ResultObj = ReturnDesc;
        goto Cleanup;


    default:

        ACPI_ERROR ((AE_INFO, "Unknown AML opcode %X",
            WalkState->Opcode));
        Status = AE_AML_BAD_OPCODE;
        break;
    }


StoreResultToTarget:

    if (ACPI_SUCCESS (Status))
    {
        /*
         * Store the result of the operation (which is now in ReturnDesc) into
         * the Target descriptor.
         */
        Status = AcpiExStore (ReturnDesc, Operand[2], WalkState);
        if (ACPI_FAILURE (Status))
        {
            goto Cleanup;
        }

        if (!WalkState->ResultObj)
        {
            WalkState->ResultObj = ReturnDesc;
        }
    }


Cleanup:

    /* Delete return object on error */

    if (ACPI_FAILURE (Status))
    {
        AcpiUtRemoveReference (ReturnDesc);
        WalkState->ResultObj = NULL;
    }

    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExOpcode_2A_0T_1R
 *
 * PARAMETERS:  WalkState           - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with 2 arguments, no target, and a return value
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExOpcode_2A_0T_1R (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
    ACPI_OPERAND_OBJECT     *ReturnDesc = NULL;
    ACPI_STATUS             Status = AE_OK;
    BOOLEAN                 LogicalResult = FALSE;


    ACPI_FUNCTION_TRACE_STR (ExOpcode_2A_0T_1R,
        AcpiPsGetOpcodeName (WalkState->Opcode));


    /* Create the internal return object */

    ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
    if (!ReturnDesc)
    {
        Status = AE_NO_MEMORY;
        goto Cleanup;
    }

    /* Execute the Opcode */

    if (WalkState->OpInfo->Flags & AML_LOGICAL_NUMERIC)
    {
        /* LogicalOp  (Operand0, Operand1) */

        Status = AcpiExDoLogicalNumericOp (WalkState->Opcode,
                        Operand[0]->Integer.Value, Operand[1]->Integer.Value,
                        &LogicalResult);
        goto StoreLogicalResult;
    }
    else if (WalkState->OpInfo->Flags & AML_LOGICAL)
    {
        /* LogicalOp  (Operand0, Operand1) */

        Status = AcpiExDoLogicalOp (WalkState->Opcode, Operand[0],
                    Operand[1], &LogicalResult);
        goto StoreLogicalResult;
    }

    switch (WalkState->Opcode)
    {
    case AML_ACQUIRE_OP:            /* Acquire (MutexObject, Timeout) */

        Status = AcpiExAcquireMutex (Operand[1], Operand[0], WalkState);
        if (Status == AE_TIME)
        {
            LogicalResult = TRUE;       /* TRUE = Acquire timed out */
            Status = AE_OK;
        }
        break;


    case AML_WAIT_OP:               /* Wait (EventObject, Timeout) */

        Status = AcpiExSystemWaitEvent (Operand[1], Operand[0]);
        if (Status == AE_TIME)
        {
            LogicalResult = TRUE;       /* TRUE, Wait timed out */
            Status = AE_OK;
        }
        break;


    default:

        ACPI_ERROR ((AE_INFO, "Unknown AML opcode %X",
            WalkState->Opcode));
        Status = AE_AML_BAD_OPCODE;
        goto Cleanup;
    }


StoreLogicalResult:
    /*
     * Set return value to according to LogicalResult. logical TRUE (all ones)
     * Default is FALSE (zero)
     */
    if (LogicalResult)
    {
        ReturnDesc->Integer.Value = ACPI_INTEGER_MAX;
    }

Cleanup:

    /* Delete return object on error */

    if (ACPI_FAILURE (Status))
    {
        AcpiUtRemoveReference (ReturnDesc);
    }

    /* Save return object on success */

    else
    {
        WalkState->ResultObj = ReturnDesc;
    }

    return_ACPI_STATUS (Status);
}