92 lines
3.7 KiB
Haskell
92 lines
3.7 KiB
Haskell
package Bus(mkBus) where
|
|
|
|
import Types
|
|
import BusTypes
|
|
import TagEngine
|
|
import Vector
|
|
import Util
|
|
import Arbiter
|
|
import FIFO
|
|
import FIFOF
|
|
import SpecialFIFOs
|
|
|
|
clientRequest :: Arbiter.ArbiterClient_IFC -> Action
|
|
clientRequest ifc = ifc.request
|
|
|
|
busRequestToAddr :: BusRequest -> Addr
|
|
busRequestToAddr req = case req of
|
|
BusReadRequest (ReadRequest addr _) -> addr
|
|
BusWriteRequest (WriteRequest addr _) -> addr
|
|
|
|
mkBus :: (Addr -> Maybe ServerIdx)
|
|
-> Module (Bus inFlightTransactions numClients numServers)
|
|
mkBus busMap = do
|
|
-- Tag engines for each client to manage transaction tags
|
|
tagEngineByClientVec :: Vector numClients (TagEngine inFlightTransactions)
|
|
tagEngineByClientVec <- replicateM mkTagEngine
|
|
|
|
-- Arbitration for clients to send requests to servers
|
|
clientArbiter :: Arbiter.Arbiter_IFC numClients
|
|
clientArbiter <- mkArbiter False
|
|
|
|
dummyVar :: Reg(Bool)
|
|
dummyVar <- mkReg False
|
|
|
|
-- Queues to hold requests from clients to servers
|
|
requestQueues :: Vector numServers (FIFOF (TaggedBusRequest inFlightTransactions))
|
|
requestQueues <- replicateM (mkSizedBypassFIFOF (valueOf inFlightTransactions))
|
|
|
|
-- Queues to hold responses from servers to clients
|
|
responseQueues :: Vector numClients (FIFOF (TaggedBusResponse inFlightTransactions))
|
|
responseQueues <- replicateM (mkSizedBypassFIFOF (valueOf inFlightTransactions))
|
|
|
|
-- Client interface vector
|
|
let clients :: Vector numClients (BusClient inFlightTransactions)
|
|
clients = genWith $ \clientIdx ->
|
|
let
|
|
selectedClientRequestQueue :: FIFOF (TaggedBusRequest inFlightTransactions)
|
|
selectedClientRequestQueue = (select requestQueues clientIdx)
|
|
|
|
selectedClientResponseQueue :: FIFOF (TaggedBusResponse inFlightTransactions)
|
|
selectedClientResponseQueue = (select responseQueues clientIdx)
|
|
|
|
selectedTagEngine :: TagEngine inFlightTransactions
|
|
selectedTagEngine = (select tagEngineByClientVec clientIdx)
|
|
in
|
|
interface BusClient
|
|
submitRequest :: BusRequest
|
|
-> ActionValue (MkTagType inFlightTransactions)
|
|
submitRequest busRequest = do
|
|
tag <- selectedTagEngine.requestTag
|
|
selectedClientRequestQueue.enq (TaggedBusRequest tag busRequest)
|
|
return tag
|
|
|
|
consumeResponse :: ActionValue (TaggedBusResponse inFlightTransactions)
|
|
consumeResponse = do
|
|
let
|
|
busResponse :: (TaggedBusResponse inFlightTransactions)
|
|
busResponse = selectedClientResponseQueue.first
|
|
selectedClientResponseQueue.deq
|
|
return busResponse
|
|
|
|
-- Server interface vector
|
|
let servers :: Vector numServers (BusServer inFlightTransactions numClients)
|
|
servers = genWith $ \serverIdx ->
|
|
interface BusServer
|
|
consumeRequest :: ActionValue (MkTagType inFlightTransactions, BusRequest)
|
|
consumeRequest = do
|
|
dummyVar := (not dummyVar)
|
|
let dummyBusRequest = BusReadRequest (ReadRequest 0 SizeByte)
|
|
return (0, dummyBusRequest)
|
|
|
|
submitResponse :: ( MkClientTagType numClients,
|
|
TaggedBusResponse inFlightTransactions
|
|
) -> Action
|
|
submitResponse (clientTag, taggedBusResponse) = do
|
|
dummyVar := (not dummyVar)
|
|
|
|
return $
|
|
interface Bus
|
|
clients = clients
|
|
servers = servers
|