137 lines
5.8 KiB
Haskell
137 lines
5.8 KiB
Haskell
package Bus(mkBus, Bus(..)) where
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import Types
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import BusTypes
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import TagEngine
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import Vector
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import Util
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import Arbiter
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import FIFO
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import FIFOF
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import SpecialFIFOs
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clientRequest :: Arbiter.ArbiterClient_IFC -> Action
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clientRequest ifc = ifc.request
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busRequestToAddr :: BusRequest -> Addr
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busRequestToAddr req = case req of
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BusReadRequest (ReadRequest addr _) -> addr
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BusWriteRequest (WriteRequest addr _) -> addr
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dummyRule :: Rules
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dummyRule =
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rules
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"test rule": when True ==> do
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$display "test rule"
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-- we need a way to make serverMap safer...
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mkBus :: (Addr -> Maybe ServerIdx)
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-> Module (Bus inFlightTransactions numClients numServers)
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mkBus serverMap = do
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-- Tag engines for each client to manage transaction tags
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tagEngineByClientVec :: Vector numClients (TagEngine inFlightTransactions)
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tagEngineByClientVec <- replicateM mkTagEngine
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-- There are `numClients` clients, each of which needs its own arbiter as
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-- there are up to `numServer` servers that may wish to submit a response
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-- to a given client. Furthermore the rule that routes client requests to
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-- servers makes for another potential requestor as it may determine that
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-- a request is unmappable and instead opt to form and submit a
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-- `BusError UnMapped` response directly to a client response arbiter. Thus
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-- we must arbit between a total of `numServers + 1` requestors.
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clientResponseArbiter :: Vector numClients (Arbiter.Arbiter_IFC (TAdd numServers 1))
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clientResponseArbiter <- replicateM (mkArbiter False)
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serverRequestArbiter :: Vector numServers (Arbiter.Arbiter_IFC numClients)
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serverRequestArbiter <- replicateM (mkArbiter False)
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dummyVar :: Reg(Bool)
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dummyVar <- mkReg False
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-- Queues to hold requests from clients
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clientRequestQueues :: Vector numClients (FIFOF (TaggedBusRequest inFlightTransactions))
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clientRequestQueues <- replicateM (mkSizedBypassFIFOF (valueOf inFlightTransactions))
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-- Queues to hold responses to clients
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clientResponseQueues :: Vector numClients (FIFOF (TaggedBusResponse inFlightTransactions))
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clientResponseQueues <- replicateM (mkSizedBypassFIFOF (valueOf inFlightTransactions))
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let clientRules :: Vector numClients (Rules)
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clientRules = genWith $ \clientIdx ->
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let
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selectedClientRequestQueue :: FIFOF (TaggedBusRequest inFlightTransactions)
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selectedClientRequestQueue = (select clientRequestQueues clientIdx)
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in
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rules
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"request": when True ==> do
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let
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clientRequest :: TaggedBusRequest inFlightTransactions
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clientRequest = selectedClientRequestQueue.first
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targetAddr :: Addr = busRequestToAddr |> clientRequest.busRequest
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targetServerIdx :: (Maybe ServerIdx) = serverMap targetAddr
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-- case targetServerIdx of
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-- Just serverIdx -> do
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-- targetServerArbiter :: Arbiter.Arbiter_IFC numClients
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-- targetServerArbiter = (select serverArbiters serverIdx)
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$display "client test rule " (fromInteger clientIdx)
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addRules |> foldr (<+>) (rules {}) clientRules
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addRules |>
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rules
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"test rule": when True ==> do
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$display "test rule"
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-- Client interface vector
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let clients :: Vector numClients (BusClient inFlightTransactions)
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clients = genWith $ \clientIdx ->
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let
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selectedClientRequestQueue :: FIFOF (TaggedBusRequest inFlightTransactions)
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selectedClientRequestQueue = (select clientRequestQueues clientIdx)
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selectedClientResponseQueue :: FIFOF (TaggedBusResponse inFlightTransactions)
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selectedClientResponseQueue = (select clientResponseQueues clientIdx)
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selectedTagEngine :: TagEngine inFlightTransactions
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selectedTagEngine = (select tagEngineByClientVec clientIdx)
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in
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interface BusClient
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submitRequest :: BusRequest
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-> ActionValue (MkTagType inFlightTransactions)
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submitRequest busRequest = do
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tag <- selectedTagEngine.requestTag
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let taggedReuqest = TaggedBusRequest {tag = tag; busRequest = busRequest}
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selectedClientRequestQueue.enq taggedReuqest
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return tag
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consumeResponse :: ActionValue (TaggedBusResponse inFlightTransactions)
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consumeResponse = do
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let
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busResponse :: (TaggedBusResponse inFlightTransactions)
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busResponse = selectedClientResponseQueue.first
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selectedClientResponseQueue.deq
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return busResponse
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-- Server interface vector
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let servers :: Vector numServers (BusServer inFlightTransactions numClients)
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servers = genWith $ \serverIdx ->
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interface BusServer
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consumeRequest :: ActionValue (MkTagType inFlightTransactions, BusRequest)
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consumeRequest = do
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dummyVar := (not dummyVar)
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let dummyBusRequest = BusReadRequest (ReadRequest 0 SizeByte)
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return (0, dummyBusRequest)
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submitResponse :: ( MkClientTagType numClients,
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TaggedBusResponse inFlightTransactions
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) -> Action
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submitResponse (clientTag, taggedBusResponse) = do
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dummyVar := (not dummyVar)
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return $
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interface Bus
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clients = clients
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servers = servers
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