exoparg6.c

acpi tools for linux include acpiexec and acpixtract

        /*
         * True if less than or equal: (P[i] <= M) (P[i] NotGreater than M)
         * Change to:                  (M >= P[i]) (M NotLess than P[i])
         */
        Status = AcpiExDoLogicalOp (AML_LLESS_OP, MatchObj, PackageObj,
                    &LogicalResult);
        if (ACPI_FAILURE (Status))
        {
            return (FALSE);
        }
        LogicalResult = (BOOLEAN) !LogicalResult;
        break;

    case MATCH_MLT:

        /*
         * True if less than: (P[i] < M)
         * Change to:         (M > P[i])
         */
        Status = AcpiExDoLogicalOp (AML_LGREATER_OP, MatchObj, PackageObj,
                    &LogicalResult);
        if (ACPI_FAILURE (Status))
        {
            return (FALSE);
        }
        break;

    case MATCH_MGE:

        /*
         * True if greater than or equal: (P[i] >= M) (P[i] NotLess than M)
         * Change to:                     (M <= P[i]) (M NotGreater than P[i])
         */
        Status = AcpiExDoLogicalOp (AML_LGREATER_OP, MatchObj, PackageObj,
                    &LogicalResult);
        if (ACPI_FAILURE (Status))
        {
            return (FALSE);
        }
        LogicalResult = (BOOLEAN)!LogicalResult;
        break;

    case MATCH_MGT:

        /*
         * True if greater than: (P[i] > M)
         * Change to:            (M < P[i])
         */
        Status = AcpiExDoLogicalOp (AML_LLESS_OP, MatchObj, PackageObj,
                    &LogicalResult);
        if (ACPI_FAILURE (Status))
        {
            return (FALSE);
        }
        break;

    default:

        /* Undefined */

        return (FALSE);
    }

    return LogicalResult;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExOpcode_6A_0T_1R
 *
 * PARAMETERS:  WalkState           - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExOpcode_6A_0T_1R (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_OPERAND_OBJECT     **Operand = &WalkState->Operands[0];
    ACPI_OPERAND_OBJECT     *ReturnDesc = NULL;
    ACPI_STATUS             Status = AE_OK;
    ACPI_INTEGER            Index;
    ACPI_OPERAND_OBJECT     *ThisElement;


    ACPI_FUNCTION_TRACE_STR (ExOpcode_6A_0T_1R,
        AcpiPsGetOpcodeName (WalkState->Opcode));


    switch (WalkState->Opcode)
    {
    case AML_MATCH_OP:
        /*
         * Match (SearchPkg[0], MatchOp1[1], MatchObj1[2],
         *                      MatchOp2[3], MatchObj2[4], StartIndex[5])
         */

        /* Validate both Match Term Operators (MTR, MEQ, etc.) */

        if ((Operand[1]->Integer.Value > MAX_MATCH_OPERATOR) ||
            (Operand[3]->Integer.Value > MAX_MATCH_OPERATOR))
        {
            ACPI_ERROR ((AE_INFO, "Match operator out of range"));
            Status = AE_AML_OPERAND_VALUE;
            goto Cleanup;
        }

        /* Get the package StartIndex, validate against the package length */

        Index = Operand[5]->Integer.Value;
        if (Index >= Operand[0]->Package.Count)
        {
            ACPI_ERROR ((AE_INFO,
                "Index (%X%8.8X) beyond package end (%X)",
                ACPI_FORMAT_UINT64 (Index), Operand[0]->Package.Count));
            Status = AE_AML_PACKAGE_LIMIT;
            goto Cleanup;
        }

        /* Create an integer for the return value */

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

        }

        /* Default return value if no match found */

        ReturnDesc->Integer.Value = ACPI_INTEGER_MAX;

        /*
         * Examine each element until a match is found. Both match conditions
         * must be satisfied for a match to occur. Within the loop,
         * "continue" signifies that the current element does not match
         * and the next should be examined.
         *
         * Upon finding a match, the loop will terminate via "break" at
         * the bottom.  If it terminates "normally", MatchValue will be
         * ACPI_INTEGER_MAX (Ones) (its initial value) indicating that no
         * match was found.
         */
        for ( ; Index < Operand[0]->Package.Count; Index++)
        {
            /* Get the current package element */

            ThisElement = Operand[0]->Package.Elements[Index];

            /* Treat any uninitialized (NULL) elements as non-matching */

            if (!ThisElement)
            {
                continue;
            }

            /*
             * Both match conditions must be satisfied. Execution of a continue
             * (proceed to next iteration of enclosing for loop) signifies a
             * non-match.
             */
            if (!AcpiExDoMatch ((UINT32) Operand[1]->Integer.Value,
                                ThisElement, Operand[2]))
            {
                continue;
            }

            if (!AcpiExDoMatch ((UINT32) Operand[3]->Integer.Value,
                                ThisElement, Operand[4]))
            {
                continue;
            }

            /* Match found: Index is the return value */

            ReturnDesc->Integer.Value = Index;
            break;
        }
        break;


    case AML_LOAD_TABLE_OP:

        Status = AcpiExLoadTableOp (WalkState, &ReturnDesc);
        break;


    default:

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


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);
}