dsopcode.c

acpi tools for linux include acpiexec and acpixtract

    ACPI_FUNCTION_TRACE_PTR (DsEvalBankFieldOperands, Op);


    /*
     * This is where we evaluate the BankValue field of the
     * BankField declaration
     */

    /* NextOp points to the op that holds the Region */

    NextOp = Op->Common.Value.Arg;

    /* NextOp points to the op that holds the Bank Register */

    NextOp = NextOp->Common.Next;

    /* NextOp points to the op that holds the Bank Value */

    NextOp = NextOp->Common.Next;

    /*
     * Set proper index into operand stack for AcpiDsObjStackPush
     * invoked inside AcpiDsCreateOperand.
     *
     * We use WalkState->Operands[0] to store the evaluated BankValue
     */
    WalkState->OperandIndex = 0;

    Status = AcpiDsCreateOperand (WalkState, NextOp, 0);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    Status = AcpiExResolveToValue (&WalkState->Operands[0], WalkState);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    ACPI_DUMP_OPERANDS (ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
                    AcpiPsGetOpcodeName (Op->Common.AmlOpcode),
                    1, "after AcpiExResolveOperands");

    /*
     * Get the BankValue operand and save it
     * (at Top of stack)
     */
    OperandDesc = WalkState->Operands[0];

    /* Arg points to the start Bank Field */

    Arg = AcpiPsGetArg (Op, 4);
    while (Arg)
    {
        /* Ignore OFFSET and ACCESSAS terms here */

        if (Arg->Common.AmlOpcode == AML_INT_NAMEDFIELD_OP)
        {
            Node = Arg->Common.Node;

            ObjDesc = AcpiNsGetAttachedObject (Node);
            if (!ObjDesc)
            {
                return_ACPI_STATUS (AE_NOT_EXIST);
            }

            ObjDesc->BankField.Value = (UINT32) OperandDesc->Integer.Value;
        }

        /* Move to next field in the list */

        Arg = Arg->Common.Next;
    }

    AcpiUtRemoveReference (OperandDesc);
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsExecBeginControlOp
 *
 * PARAMETERS:  WalkList        - The list that owns the walk stack
 *              Op              - The control Op
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handles all control ops encountered during control method
 *              execution.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiDsExecBeginControlOp (
    ACPI_WALK_STATE         *WalkState,
    ACPI_PARSE_OBJECT       *Op)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_GENERIC_STATE      *ControlState;


    ACPI_FUNCTION_NAME (DsExecBeginControlOp);


    ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", Op,
        Op->Common.AmlOpcode, WalkState));

    switch (Op->Common.AmlOpcode)
    {
    case AML_IF_OP:
    case AML_WHILE_OP:

        /*
         * IF/WHILE: Create a new control state to manage these
         * constructs. We need to manage these as a stack, in order
         * to handle nesting.
         */
        ControlState = AcpiUtCreateControlState ();
        if (!ControlState)
        {
            Status = AE_NO_MEMORY;
            break;
        }
        /*
         * Save a pointer to the predicate for multiple executions
         * of a loop
         */
        ControlState->Control.AmlPredicateStart = WalkState->ParserState.Aml - 1;
        ControlState->Control.PackageEnd = WalkState->ParserState.PkgEnd;
        ControlState->Control.Opcode = Op->Common.AmlOpcode;


        /* Push the control state on this walk's control stack */

        AcpiUtPushGenericState (&WalkState->ControlState, ControlState);
        break;

    case AML_ELSE_OP:

        /* Predicate is in the state object */
        /* If predicate is true, the IF was executed, ignore ELSE part */

        if (WalkState->LastPredicate)
        {
            Status = AE_CTRL_TRUE;
        }

        break;

    case AML_RETURN_OP:

        break;

    default:
        break;
    }

    return (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsExecEndControlOp
 *
 * PARAMETERS:  WalkList        - The list that owns the walk stack
 *              Op              - The control Op
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handles all control ops encountered during control method
 *              execution.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiDsExecEndControlOp (
    ACPI_WALK_STATE         *WalkState,
    ACPI_PARSE_OBJECT       *Op)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_GENERIC_STATE      *ControlState;


    ACPI_FUNCTION_NAME (DsExecEndControlOp);


    switch (Op->Common.AmlOpcode)
    {
    case AML_IF_OP:

        ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", Op));

        /*
         * Save the result of the predicate in case there is an
         * ELSE to come
         */
        WalkState->LastPredicate =
            (BOOLEAN) WalkState->ControlState->Common.Value;

        /*
         * Pop the control state that was created at the start
         * of the IF and free it
         */
        ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
        AcpiUtDeleteGenericState (ControlState);
        break;


    case AML_ELSE_OP:

        break;


    case AML_WHILE_OP:

        ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", Op));

        if (WalkState->ControlState->Common.Value)
        {
            /* Predicate was true, go back and evaluate it again! */

            Status = AE_CTRL_PENDING;
        }

        ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
            "[WHILE_OP] termination! Op=%p\n",Op));

        /* Pop this control state and free it */

        ControlState = AcpiUtPopGenericState (&WalkState->ControlState);

        WalkState->AmlLastWhile = ControlState->Control.AmlPredicateStart;
        AcpiUtDeleteGenericState (ControlState);
        break;


    case AML_RETURN_OP:

        ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
            "[RETURN_OP] Op=%p Arg=%p\n",Op, Op->Common.Value.Arg));

        /*
         * One optional operand -- the return value
         * It can be either an immediate operand or a result that
         * has been bubbled up the tree
         */
        if (Op->Common.Value.Arg)
        {
            /* Since we have a real Return(), delete any implicit return */

            AcpiDsClearImplicitReturn (WalkState);

            /* Return statement has an immediate operand */

            Status = AcpiDsCreateOperands (WalkState, Op->Common.Value.Arg);
            if (ACPI_FAILURE (Status))
            {
                return (Status);
            }

            /*
             * If value being returned is a Reference (such as
             * an arg or local), resolve it now because it may
             * cease to exist at the end of the method.
             */
            Status = AcpiExResolveToValue (&WalkState->Operands [0], WalkState);
            if (ACPI_FAILURE (Status))
            {
                return (Status);
            }

            /*
             * Get the return value and save as the last result
             * value.  This is the only place where WalkState->ReturnDesc
             * is set to anything other than zero!
             */
            WalkState->ReturnDesc = WalkState->Operands[0];
        }
        else if (WalkState->ResultCount)
        {
            /* Since we have a real Return(), delete any implicit return */

            AcpiDsClearImplicitReturn (WalkState);

            /*
             * The return value has come from a previous calculation.
             *
             * If value being returned is a Reference (such as
             * an arg or local), resolve it now because it may
             * cease to exist at the end of the method.
             *
             * Allow references created by the Index operator to return unchanged.
             */
            if ((ACPI_GET_DESCRIPTOR_TYPE (WalkState->Results->Results.ObjDesc[0]) == ACPI_DESC_TYPE_OPERAND) &&
                (ACPI_GET_OBJECT_TYPE (WalkState->Results->Results.ObjDesc [0]) == ACPI_TYPE_LOCAL_REFERENCE) &&
                ((WalkState->Results->Results.ObjDesc [0])->Reference.Opcode != AML_INDEX_OP))
            {
                Status = AcpiExResolveToValue (&WalkState->Results->Results.ObjDesc [0], WalkState);
                if (ACPI_FAILURE (Status))
                {
                    return (Status);
                }
            }

            WalkState->ReturnDesc = WalkState->Results->Results.ObjDesc [0];
        }
        else
        {
            /* No return operand */

            if (WalkState->NumOperands)
            {
                AcpiUtRemoveReference (WalkState->Operands [0]);
            }

            WalkState->Operands [0]     = NULL;
            WalkState->NumOperands      = 0;
            WalkState->ReturnDesc       = NULL;
        }


        ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
            "Completed RETURN_OP State=%p, RetVal=%p\n",
            WalkState, WalkState->ReturnDesc));

        /* End the control method execution right now */

        Status = AE_CTRL_TERMINATE;
        break;


    case AML_NOOP_OP:

        /* Just do nothing! */
        break;


    case AML_BREAK_POINT_OP:

        /* Call up to the OS service layer to handle this */

        Status = AcpiOsSignal (ACPI_SIGNAL_BREAKPOINT, "Executed AML Breakpoint opcode");

        /* If and when it returns, all done. */

        break;


    case AML_BREAK_OP:
    case AML_CONTINUE_OP: /* ACPI 2.0 */


        /* Pop and delete control states until we find a while */

        while (WalkState->ControlState &&
                (WalkState->ControlState->Control.Opcode != AML_WHILE_OP))
        {
            ControlState = AcpiUtPopGenericState (&WalkState->ControlState);
            AcpiUtDeleteGenericState (ControlState);
        }

        /* No while found? */

        if (!WalkState->ControlState)
        {
            return (AE_AML_NO_WHILE);
        }

        /* Was: WalkState->AmlLastWhile = WalkState->ControlState->Control.AmlPredicateStart; */

        WalkState->AmlLastWhile = WalkState->ControlState->Control.PackageEnd;

        /* Return status depending on opcode */

        if (Op->Common.AmlOpcode == AML_BREAK_OP)
        {
            Status = AE_CTRL_BREAK;
        }
        else
        {
            Status = AE_CTRL_CONTINUE;
        }
        break;


    default:

        ACPI_ERROR ((AE_INFO, "Unknown control opcode=%X Op=%p",
            Op->Common.AmlOpcode, Op));

        Status = AE_AML_BAD_OPCODE;
        break;
    }

    return (Status);
}