dswstate.c

acpi tools for linux include acpiexec and acpixtract

ACPI_STATUS
AcpiDsObjStackPop (
    UINT32                  PopCount,
    ACPI_WALK_STATE         *WalkState)
{
    UINT32                  i;


    ACPI_FUNCTION_NAME (DsObjStackPop);


    for (i = 0; i < PopCount; i++)
    {
        /* Check for stack underflow */

        if (WalkState->NumOperands == 0)
        {
            ACPI_ERROR ((AE_INFO,
                "Object stack underflow! Count=%X State=%p #Ops=%X",
                PopCount, WalkState, WalkState->NumOperands));
            return (AE_STACK_UNDERFLOW);
        }

        /* Just set the stack entry to null */

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

    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
        PopCount, WalkState, WalkState->NumOperands));

    return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsObjStackPopAndDelete
 *
 * PARAMETERS:  PopCount            - Number of objects/entries to pop
 *              WalkState           - Current Walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Pop this walk's object stack and delete each object that is
 *              popped off.
 *
 ******************************************************************************/

void
AcpiDsObjStackPopAndDelete (
    UINT32                  PopCount,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_NATIVE_INT         i;
    ACPI_OPERAND_OBJECT     *ObjDesc;


    ACPI_FUNCTION_NAME (DsObjStackPopAndDelete);


    if (PopCount == 0)
    {
        return;
    }

    for (i = (ACPI_NATIVE_INT)(PopCount - 1); i >= 0; i--)
    {
        if (WalkState->NumOperands == 0)
        {
            return;
        }

        /* Pop the stack and delete an object if present in this stack entry */

        WalkState->NumOperands--;
        ObjDesc = WalkState->Operands [i];
        if (ObjDesc)
        {
            AcpiUtRemoveReference (WalkState->Operands [i]);
            WalkState->Operands [i] = NULL;
        }
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
        PopCount, WalkState, WalkState->NumOperands));
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsGetCurrentWalkState
 *
 * PARAMETERS:  Thread          - Get current active state for this Thread
 *
 * RETURN:      Pointer to the current walk state
 *
 * DESCRIPTION: Get the walk state that is at the head of the list (the "current"
 *              walk state.)
 *
 ******************************************************************************/

ACPI_WALK_STATE *
AcpiDsGetCurrentWalkState (
    ACPI_THREAD_STATE       *Thread)
{
    ACPI_FUNCTION_NAME (DsGetCurrentWalkState);


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

    ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Current WalkState %p\n",
        Thread->WalkStateList));

    return (Thread->WalkStateList);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsPushWalkState
 *
 * PARAMETERS:  WalkState       - State to push
 *              Thread          - Thread state object
 *
 * RETURN:      None
 *
 * DESCRIPTION: Place the Thread state at the head of the state list
 *
 ******************************************************************************/

void
AcpiDsPushWalkState (
    ACPI_WALK_STATE         *WalkState,
    ACPI_THREAD_STATE       *Thread)
{
    ACPI_FUNCTION_TRACE (DsPushWalkState);


    WalkState->Next = Thread->WalkStateList;
    Thread->WalkStateList = WalkState;

    return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsPopWalkState
 *
 * PARAMETERS:  Thread      - Current thread state
 *
 * RETURN:      A WalkState object popped from the thread's stack
 *
 * DESCRIPTION: Remove and return the walkstate object that is at the head of
 *              the walk stack for the given walk list.  NULL indicates that
 *              the list is empty.
 *
 ******************************************************************************/

ACPI_WALK_STATE *
AcpiDsPopWalkState (
    ACPI_THREAD_STATE       *Thread)
{
    ACPI_WALK_STATE         *WalkState;


    ACPI_FUNCTION_TRACE (DsPopWalkState);


    WalkState = Thread->WalkStateList;

    if (WalkState)
    {
        /* Next walk state becomes the current walk state */

        Thread->WalkStateList = WalkState->Next;

        /*
         * Don't clear the NEXT field, this serves as an indicator
         * that there is a parent WALK STATE
         * Do Not: WalkState->Next = NULL;
         */
    }

    return_PTR (WalkState);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsCreateWalkState
 *
 * PARAMETERS:  OwnerId         - ID for object creation
 *              Origin          - Starting point for this walk
 *              MethodDesc      - Method object
 *              Thread          - Current thread state
 *
 * RETURN:      Pointer to the new walk state.
 *
 * DESCRIPTION: Allocate and initialize a new walk state.  The current walk
 *              state is set to this new state.
 *
 ******************************************************************************/

ACPI_WALK_STATE *
AcpiDsCreateWalkState (
    ACPI_OWNER_ID           OwnerId,
    ACPI_PARSE_OBJECT       *Origin,
    ACPI_OPERAND_OBJECT     *MethodDesc,
    ACPI_THREAD_STATE       *Thread)
{
    ACPI_WALK_STATE         *WalkState;


    ACPI_FUNCTION_TRACE (DsCreateWalkState);


    WalkState = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_WALK_STATE));
    if (!WalkState)
    {
        return_PTR (NULL);
    }

    WalkState->DescriptorType = ACPI_DESC_TYPE_WALK;
    WalkState->MethodDesc = MethodDesc;
    WalkState->OwnerId = OwnerId;
    WalkState->Origin = Origin;
    WalkState->Thread = Thread;

    WalkState->ParserState.StartOp = Origin;

    /* Init the method args/local */

#if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
    AcpiDsMethodDataInit (WalkState);
#endif

    /* Put the new state at the head of the walk list */

    if (Thread)
    {
        AcpiDsPushWalkState (WalkState, Thread);
    }

    return_PTR (WalkState);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsInitAmlWalk
 *
 * PARAMETERS:  WalkState       - New state to be initialized
 *              Op              - Current parse op
 *              MethodNode      - Control method NS node, if any
 *              AmlStart        - Start of AML
 *              AmlLength       - Length of AML
 *              Info            - Method info block (params, etc.)
 *              PassNumber      - 1, 2, or 3
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk
 *
 ******************************************************************************/

ACPI_STATUS
AcpiDsInitAmlWalk (
    ACPI_WALK_STATE         *WalkState,
    ACPI_PARSE_OBJECT       *Op,
    ACPI_NAMESPACE_NODE     *MethodNode,
    UINT8                   *AmlStart,
    UINT32                  AmlLength,
    ACPI_EVALUATE_INFO      *Info,
    UINT8                   PassNumber)
{
    ACPI_STATUS             Status;
    ACPI_PARSE_STATE        *ParserState = &WalkState->ParserState;
    ACPI_PARSE_OBJECT       *ExtraOp;


    ACPI_FUNCTION_TRACE (DsInitAmlWalk);


    WalkState->ParserState.Aml =
    WalkState->ParserState.AmlStart = AmlStart;
    WalkState->ParserState.AmlEnd =
    WalkState->ParserState.PkgEnd = AmlStart + AmlLength;

    /* The NextOp of the NextWalk will be the beginning of the method */

    WalkState->NextOp = NULL;
    WalkState->PassNumber = PassNumber;

    if (Info)
    {
        if (Info->ParameterType == ACPI_PARAM_GPE)
        {
            WalkState->GpeEventInfo =
                ACPI_CAST_PTR (ACPI_GPE_EVENT_INFO, Info->Parameters);
        }
        else
        {
            WalkState->Params = Info->Parameters;
            WalkState->CallerReturnDesc = &Info->ReturnObject;
        }
    }

    Status = AcpiPsInitScope (&WalkState->ParserState, Op);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }

    if (MethodNode)
    {
        WalkState->ParserState.StartNode = MethodNode;
        WalkState->WalkType = ACPI_WALK_METHOD;
        WalkState->MethodNode = MethodNode;
        WalkState->MethodDesc = AcpiNsGetAttachedObject (MethodNode);

        /* Push start scope on scope stack and make it current  */

        Status = AcpiDsScopeStackPush (MethodNode, ACPI_TYPE_METHOD, WalkState);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }

        /* Init the method arguments */

        Status = AcpiDsMethodDataInitArgs (WalkState->Params,
                    ACPI_METHOD_NUM_ARGS, WalkState);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
    }
    else
    {
        /*
         * Setup the current scope.
         * Find a Named Op that has a namespace node associated with it.
         * search upwards from this Op.  Current scope is the first
         * Op with a namespace node.
         */
        ExtraOp = ParserState->StartOp;
        while (ExtraOp && !ExtraOp->Common.Node)
        {
            ExtraOp = ExtraOp->Common.Parent;
        }

        if (!ExtraOp)
        {
            ParserState->StartNode = NULL;
        }
        else
        {
            ParserState->StartNode = ExtraOp->Common.Node;
        }

        if (ParserState->StartNode)
        {
            /* Push start scope on scope stack and make it current  */

            Status = AcpiDsScopeStackPush (ParserState->StartNode,
                            ParserState->StartNode->Type, WalkState);
            if (ACPI_FAILURE (Status))
            {
                return_ACPI_STATUS (Status);
            }
        }
    }

    Status = AcpiDsInitCallbacks (WalkState, PassNumber);
    return_ACPI_STATUS (Status);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiDsDeleteWalkState
 *
 * PARAMETERS:  WalkState       - State to delete
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Delete a walk state including all internal data structures
 *
 ******************************************************************************/

void
AcpiDsDeleteWalkState (
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_GENERIC_STATE      *State;


    ACPI_FUNCTION_TRACE_PTR (DsDeleteWalkState, WalkState);


    if (!WalkState)
    {
        return;
    }

    if (WalkState->DescriptorType != ACPI_DESC_TYPE_WALK)
    {
        ACPI_ERROR ((AE_INFO, "%p is not a valid walk state",
            WalkState));
        return;
    }

    /* There should not be any open scopes */

    if (WalkState->ParserState.Scope)
    {
        ACPI_ERROR ((AE_INFO, "%p walk still has a scope list",
            WalkState));
        AcpiPsCleanupScope (&WalkState->ParserState);
    }

    /* Always must free any linked control states */

    while (WalkState->ControlState)
    {
        State = WalkState->ControlState;
        WalkState->ControlState = State->Common.Next;

        AcpiUtDeleteGenericState (State);
    }

    /* Always must free any linked parse states */

    while (WalkState->ScopeInfo)
    {
        State = WalkState->ScopeInfo;
        WalkState->ScopeInfo = State->Common.Next;

        AcpiUtDeleteGenericState (State);
    }

    /* Always must free any stacked result states */

    while (WalkState->Results)
    {
        State = WalkState->Results;
        WalkState->Results = State->Common.Next;

        AcpiUtDeleteGenericState (State);
    }

    ACPI_FREE (WalkState);
    return_VOID;
}