flake: Fix bluespec bsc binary

Nixpkgs pr incoming

.gitignore

@@ -1,4 +1,5 @@
 *.vcd
+*.bkp
 *.so
 
 # bluespec files

LICENSE

@@ -0,0 +1,198 @@
+Preamble
+
+The GNU General Public License is a free, copyleft license for software and other kinds of works.
+
+The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too.
+
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+
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+0. Definitions.
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+
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+
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+
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+
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+
+11. Patents.
+
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+
+A contributor's “essential patent claims” are all patent claims owned or controlled by the contributor, whether already acquired or hereafter acquired, that would be infringed by some manner, permitted by this License, of making, using, or selling its contributor version, but do not include claims that would be infringed only as a consequence of further modification of the contributor version. For purposes of this definition, “control” includes the right to grant patent sublicenses in a manner consistent with the requirements of this License.
+
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+
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+
+Nothing in this License shall be construed as excluding or limiting any implied license or other defenses to infringement that may otherwise be available to you under applicable patent law.
+
+12. No Surrender of Others' Freedom.
+
+If conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot convey a covered work so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not convey it at all. For example, if you agree to terms that obligate you to collect a royalty for further conveying from those to whom you convey the Program, the only way you could satisfy both those terms and this License would be to refrain entirely from conveying the Program.
+
+13. Use with the GNU Affero General Public License.
+
+Notwithstanding any other provision of this License, you have permission to link or combine any covered work with a work licensed under version 3 of the GNU Affero General Public License into a single combined work, and to convey the resulting work. The terms of this License will continue to apply to the part which is the covered work, but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such.
+
+14. Revised Versions of this License.
+
+The Free Software Foundation may publish revised and/or new versions of the GNU General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns.
+
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+
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+
+Later license versions may give you additional or different permissions. However, no additional obligations are imposed on any author or copyright holder as a result of your choosing to follow a later version.
+
+15. Disclaimer of Warranty.
+
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+16. Limitation of Liability.
+
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+17. Interpretation of Sections 15 and 16.
+
+If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee.
+
+END OF TERMS AND CONDITIONS

Makefile

@@ -51,7 +51,6 @@ BSC_COMP_FLAGS += \
 		-aggressive-conditions  \
 		-no-warn-action-shadowing  \
 		-check-assert  \
-		-cpp \
 		-show-schedule \
 		+RTS -K128M -RTS  -show-range-conflict \
 		$(BSC_COMP_FLAG1)  $(BSC_COMP_FLAG2)  $(BSC_COMP_FLAG3)
@@ -61,7 +60,7 @@ $(BDPI_OBJ): $(BDPI_SRC)
 
 BSC_LINK_FLAGS += -keep-fires
 
-BSC_PATHS = -p bs/:bsv/:+
+BSC_PATHS = -p bs/Bus/:bs/:bs/Tests/:bsv/:+
 
 .PHONY: help
 help:

bs/Bus.bs

@@ -1,7 +0,0 @@
-package Bus(a) where
-
-import Types
-import BusTypes
-
-a :: UInt 5
-a = 3

bs/Bus/Bus.bs

@@ -0,0 +1,203 @@
+package Bus(mkBus, Bus(..)) where
+
+import Types
+import BusTypes
+import Client
+import Server
+import TagEngine
+
+import Vector
+import Util
+import Arbiter
+import FIFO
+import FIFOF
+import SpecialFIFOs
+import Printf
+
+-- Creates a Bus Module that supports multiple clients and servers
+-- submitting requests and simultaneously returning responses.
+-- Responses can be consumed by clients out of order(useful when some
+-- servers respond before others) as all client submitted requests are
+-- tagged with tags that are unique for the duration of the transaction
+--  - and well-behaved servers should keep that tag when responding.
+
+-- Explicitly inform the compiler that log2 n <= log2(n + 1)
+mkBus :: (Add n (TLog numServers) (TLog (TAdd numServers 1)))
+      => (Addr -> Maybe (MkServerIdx numServers))
+      -> Module (Bus inFlightTransactions numClients numServers)
+mkBus serverMap = do
+    -- Tag engines for each client to manage transaction tags
+    tagEngineByClientVec :: Vector numClients (TagEngine inFlightTransactions)
+    tagEngineByClientVec <- replicateM mkTagEngine
+
+    -- There are `numClients` clients, each of which needs its own client
+    -- response arbiter as there are `numServer` servers that may wish to
+    -- submit a response to a given client. Furthermore the rule that routes
+    -- client requests to servers makes for another potential submitter to
+    -- the client response arbiter as it may determine that a request is
+    -- unmappable and simply bypass submitting the request to a server,
+    -- instead opting to form a `BusError UnMapped` response to be submitted
+    -- directly to a client response arbiter. Thus the client response arbiter
+    -- must arbit between a total of `numServers + 1` requestors.
+    responseArbiterByClient :: Vector numClients (Arbiter.Arbiter_IFC (TAdd numServers 1))
+    responseArbiterByClient <- replicateM (mkArbiter False)
+
+    -- There are `numServer` servers, each of which needs its own arbiter as
+    -- there are up to `numClient` clients that may wish to submit a response
+    -- to a given server.
+    requestArbiterByServer :: Vector numServers (Arbiter.Arbiter_IFC numClients)
+    requestArbiterByServer <- replicateM (mkArbiter False)
+
+    -- Queues to hold requests from clients
+    clientRequestQueues :: Vector numClients (FIFOF (TaggedBusRequest inFlightTransactions))
+    clientRequestQueues <- replicateM (mkSizedBypassFIFOF (valueOf inFlightTransactions))
+
+    -- Queues to hold responses to clients
+    clientResponseQueues :: Vector numClients (FIFOF (TaggedBusResponse inFlightTransactions))
+    clientResponseQueues <- replicateM (mkSizedBypassFIFOF (valueOf inFlightTransactions))
+
+    -- The following two vectors of single depth FIFOs make it easier to push/pull data
+    -- to/from internal server methods as they provide back-pressure in both directions,
+    -- and behave as a wire when queue is empty.
+    -- If looking at the example bus.drawio diagram, the following two vectors effectively
+    -- correspond to the two arrows going from the blue box to the servers.
+    consumeRequestQueues :: Vector numServers (
+                                        FIFOF (
+                                            MkClientTagType numClients,
+                                            TaggedBusRequest inFlightTransactions
+                                            )
+                                        )
+    consumeRequestQueues <- replicateM mkBypassFIFOF
+
+    submitResponseQueues :: Vector numServers (
+                                        FIFOF (
+                                            MkClientTagType numClients,
+                                            TaggedBusResponse inFlightTransactions
+                                            )
+                                        )
+    submitResponseQueues <- replicateM mkBypassFIFOF
+
+    let clientRules :: Vector numClients (Rules)
+        clientRules = genWith |> \clientIdx ->
+            let selectedClientReqQueue :: FIFOF (TaggedBusRequest inFlightTransactions)
+                selectedClientReqQueue = select clientRequestQueues clientIdx
+
+                selectedClientRespQueue :: FIFOF (TaggedBusResponse inFlightTransactions)
+                selectedClientRespQueue = select clientResponseQueues clientIdx
+
+                selectedClientRespArbiter :: Arbiter.Arbiter_IFC (TAdd numServers 1)
+                selectedClientRespArbiter = select responseArbiterByClient clientIdx
+
+                clientRouterRule :: Rules
+                clientRouterRule =  clientRouteRequest
+                    clientIdx
+                    selectedClientReqQueue
+                    requestArbiterByServer
+                    responseArbiterByClient
+                    serverMap
+
+                clientArbiterRule :: Rules
+                clientArbiterRule = clientArbitSubmission
+                    clientIdx
+                    selectedClientReqQueue
+                    selectedClientRespQueue
+                    selectedClientRespArbiter
+                    submitResponseQueues
+            in
+                clientRouterRule <+> clientArbiterRule
+
+    let serverRules :: Vector numServers (Rules)
+        serverRules = genWith |> \serverIdx ->
+            let selectedServerArbiter :: Arbiter.Arbiter_IFC numClients
+                selectedServerArbiter = select requestArbiterByServer serverIdx
+
+                selectedConsumeReqQueue :: FIFOF (MkClientTagType numClients, TaggedBusRequest inFlightTransactions)
+                selectedConsumeReqQueue = select consumeRequestQueues serverIdx
+
+                selectedSubmitRespQueue :: FIFOF (MkClientTagType numClients, TaggedBusResponse inFlightTransactions)
+                selectedSubmitRespQueue = select submitResponseQueues serverIdx
+
+                serverRouterRule :: Rules
+                serverRouterRule = serverRouteResponse
+                    serverIdx
+                    selectedSubmitRespQueue
+                    responseArbiterByClient
+
+                serverArbiterRule :: Rules
+                serverArbiterRule = serverArbitRequests
+                    serverIdx
+                    selectedServerArbiter
+                    selectedConsumeReqQueue
+                    clientRequestQueues
+            in
+                serverRouterRule <+> serverArbiterRule
+
+    addRules |> foldr (<+>) (rules {}) clientRules
+    addRules |> foldr (<+>) (rules {}) serverRules
+
+    -- Client interface vector
+    let clients :: Vector numClients (BusClient inFlightTransactions)
+        clients = genWith |> \clientIdx ->
+            let
+                selectedClientRequestQueue :: FIFOF (TaggedBusRequest inFlightTransactions)
+                selectedClientRequestQueue = (select clientRequestQueues clientIdx)
+
+                selectedClientResponseQueue :: FIFOF (TaggedBusResponse inFlightTransactions)
+                selectedClientResponseQueue = (select clientResponseQueues clientIdx)
+
+                selectedTagEngine :: TagEngine inFlightTransactions
+                selectedTagEngine = (select tagEngineByClientVec clientIdx)
+            in
+                interface BusClient
+                    submitRequest   :: BusRequest
+                                    -> ActionValue (MkTagType inFlightTransactions)
+                    submitRequest busRequest = do
+                        tag <- selectedTagEngine.requestTag
+                        let taggedReuqest = TaggedBusRequest {tag = tag; busRequest = busRequest}
+                        selectedClientRequestQueue.enq taggedReuqest
+                        return tag
+
+                    consumeResponse :: ActionValue (TaggedBusResponse inFlightTransactions)
+                    consumeResponse = do
+                        let
+                            busResponse :: (TaggedBusResponse inFlightTransactions)
+                            busResponse = selectedClientResponseQueue.first
+                        selectedTagEngine.retireTag busResponse.tag
+                        selectedClientResponseQueue.deq
+                        return busResponse
+
+    -- Server interface vector
+    let servers :: Vector numServers (BusServer inFlightTransactions numClients)
+        servers = genWith |> \serverIdx ->
+            let
+                selectedConsumeRequestQueue :: FIFOF (
+                                                MkClientTagType numClients,
+                                                TaggedBusRequest inFlightTransactions
+                                                )
+                selectedConsumeRequestQueue = (select consumeRequestQueues serverIdx)
+            in
+                interface BusServer
+                    consumeRequest  :: ActionValue (
+                                        MkClientTagType numClients,
+                                        TaggedBusRequest inFlightTransactions
+                                        )
+                    consumeRequest = do
+                        selectedConsumeRequestQueue.deq
+                        return selectedConsumeRequestQueue.first
+
+                    submitResponse  :: ( MkClientTagType numClients,
+                                        TaggedBusResponse inFlightTransactions
+                                        ) -> Action
+                    submitResponse (clientTag, taggedBusResponse) = do
+                        let
+                            selectedSubmitResponseQueue :: FIFOF (
+                                                                MkClientTagType numClients,
+                                                                TaggedBusResponse inFlightTransactions
+                                                            )
+                            selectedSubmitResponseQueue = (select submitResponseQueues serverIdx)
+                        selectedSubmitResponseQueue.enq (clientTag, taggedBusResponse)
+
+    return |>
+        interface Bus
+            clients = clients
+            servers = servers

bs/Bus/BusTypes.bs

@@ -0,0 +1,115 @@
+package BusTypes(
+    Bus(..),
+    MkServerIdx,
+    MkClientTagType,
+    BusClient(..), BusServer(..),
+    BusRequest(..), BusResponse(..),
+    ReadRequest(..), ReadResponse(..), WriteRequest(..), WriteResponse(..),
+    BusVal(..), BusError(..), TransactionSize(..),
+    TaggedBusRequest(..), TaggedBusResponse(..)
+    ) where
+
+import Types
+import Vector
+import TagEngine
+
+type MkClientTagType numClients = (UInt (TLog numClients))
+type MkServerIdx numServers = (UInt (TLog numServers))
+
+data BusError
+    = UnMapped
+    | UnAligned
+    deriving (Bits, Eq, FShow)
+
+data TransactionSize
+    = SizeByte
+    | SizeHalfWord
+    | SizeFullWord
+    | SizeDoubleWord
+    | SizeQuadWord
+    deriving (Bits, Eq, FShow)
+
+data BusVal
+    = BusByte Byte
+    | BusHalfWord HalfWord
+    | BusFullWord FullWord
+    | BusDoubleWord DoubleWord
+    | BusQuadWord QuadWord
+    deriving (Bits, Eq, FShow)
+
+data ReadRequest = ReadRequest Addr TransactionSize
+    deriving (Bits, Eq, FShow)
+
+data WriteRequest = WriteRequest Addr BusVal
+    deriving (Bits, Eq, FShow)
+
+type ReadResponse = Either BusError BusVal
+type WriteResponse = Either BusError ()
+
+data BusRequest
+  = BusReadRequest      ReadRequest
+  | BusWriteRequest     WriteRequest
+  deriving (Bits, Eq, FShow)
+
+data BusResponse
+  = BusReadResponse     ReadResponse
+  | BusWriteResponse    WriteResponse
+  deriving (Bits, Eq, FShow)
+
+struct TaggedBusRequest inFlightTransactions =
+    { tag :: (MkTagType inFlightTransactions);
+      busRequest :: BusRequest
+    }
+    deriving (Bits, Eq, FShow)
+
+struct TaggedBusResponse inFlightTransactions =
+    { tag :: (MkTagType inFlightTransactions);
+      busResponse :: BusResponse
+    }
+    deriving (Bits, Eq, FShow)
+
+-- # BusClient.submitRequest
+--   * The bus client calls the `submitRequest` method of the `BusClient` interface
+--     with the `BusRequest` it wishes to submit and immediately recieves back
+--     a transaction-duration-unqiue tag that it can later correlate with the
+--     returned response should responses arrive out of order(OOO). OOO can
+--     happen if a bus server is is able to process bus requests faster than
+--     other bus servers for example.
+-- # BusClient.consumeResponse
+--   * The bus client is able to consume a response when a response is available.
+--     Responses are tagged with the tag given to bus client when it called
+--     `submitRequest`
+interface (BusClient :: # -> *) inFlightTransactions =
+  submitRequest   :: BusRequest
+                  -> ActionValue (MkTagType inFlightTransactions)
+  consumeResponse :: ActionValue (TaggedBusResponse inFlightTransactions)
+
+-- # BusServer.consumeRequest
+--   * The bus server calls the `consumeRequest` method of the `BusServer` interface
+--     to retrieve a pending bus request initiated by a client. It immediately
+--     receives a tuple containing a transaction-duration-unique tag
+--     (associated with the original request) and the `BusRequest` itself. This
+--     tag is used to track the transaction and correlate it with the eventual
+--     response.
+-- # BusServer.submitResponse
+--   * The bus server calls the `submitResponse` method to send a `BusResponse`
+--     back to the originating client. The method takes a tuple containing:
+--     - A client tag (of type `MkClientTagType numClients`) identifying the
+--       client that submitted the request.
+--     - The `BusResponse` containing the result of the request (either a read
+--       or write response).
+--     - The transaction tag (of type `transactionTagType`) that matches the tag
+--       received from `consumeRequest`, ensuring the response is correctly
+--       associated with the original request.
+interface (BusServer :: # -> # -> *) inFlightTransactions numClients =
+  consumeRequest  :: ActionValue (
+                      MkClientTagType numClients,
+                      TaggedBusRequest inFlightTransactions
+                      )
+  submitResponse  :: ( MkClientTagType numClients,
+                       TaggedBusResponse inFlightTransactions
+                       ) -> Action
+
+interface (Bus :: # -> # -> # -> *) inFlightTransactions numClients numServers =
+  clients :: Vector numClients (BusClient inFlightTransactions)
+  servers :: Vector numServers (BusServer inFlightTransactions numClients)

bs/Bus/Client.bs

@@ -0,0 +1,113 @@
+package Client(
+    clientRouteRequest,
+    clientArbitSubmission
+) where
+
+import Types
+import BusTypes
+import TagEngine
+import Vector
+import Util
+import Arbiter
+import FIFO
+import FIFOF
+import SpecialFIFOs
+import Printf
+
+busRequestToAddr :: BusRequest -> Addr
+busRequestToAddr req = case req of
+    BusReadRequest (ReadRequest addr _) -> addr
+    BusWriteRequest (WriteRequest addr _) -> addr
+
+clientRouteRequest :: (Add n (TLog numServers) (TLog (TAdd numServers 1)))
+                  => Integer
+                  -> FIFOF (TaggedBusRequest inFlightTransactions)
+                  -> Vector numServers (Arbiter.Arbiter_IFC numClients)
+                  -> Vector numClients (Arbiter.Arbiter_IFC (TAdd numServers 1))
+                  -> (Addr -> Maybe (MkServerIdx numServers))
+                  -> Rules
+clientRouteRequest clientIdx clientReqQueue requestArbiterByServer responseArbiterByClient serverMap =
+    rules
+        (sprintf "client[%d] route request" clientIdx): when True ==> do
+            let clientRequest :: TaggedBusRequest inFlightTransactions
+                clientRequest = clientReqQueue.first
+
+                targetAddr :: Addr
+                targetAddr = busRequestToAddr |> clientRequest.busRequest
+
+                targetServerIdx :: Maybe (MkServerIdx numServers)
+                targetServerIdx = serverMap targetAddr
+            case targetServerIdx of
+                Just serverIdx -> do
+                    let targetServerArbiter :: Arbiter.Arbiter_IFC numClients
+                        targetServerArbiter = select requestArbiterByServer serverIdx
+
+                        arbiterClientSlot :: Arbiter.ArbiterClient_IFC
+                        arbiterClientSlot = select targetServerArbiter.clients clientIdx
+                    arbiterClientSlot.request
+                -- We bypass sensing the request to the server instead option to form
+                -- a `BusError Unmapped` response which we request to send directly to
+                -- the appropiate client response queue.
+                Nothing -> do
+                    let targetClientResponseArbiter :: Arbiter.Arbiter_IFC (TAdd numServers 1)
+                        targetClientResponseArbiter = select responseArbiterByClient clientIdx
+
+                        -- arbiters 0 to n-1 where `n:=numServer` are reserved
+                        -- for servers to make requests to. Arbiter n is reserved for
+                        -- when this rule needs to skip making a request to a server
+                        -- and should instead forward the `BusError UnMapped` response
+                        -- back to the client. Vector.last selects arbiter `n`
+                        clientResponseArbiterSlot :: Arbiter.ArbiterClient_IFC
+                        clientResponseArbiterSlot = Vector.last targetClientResponseArbiter.clients
+
+                        responseUnMapped :: BusResponse
+                        responseUnMapped = case clientRequest.busRequest of
+                            BusReadRequest _ -> BusReadResponse (Left UnMapped)
+                            BusWriteRequest _ -> BusWriteResponse (Left UnMapped)
+
+                        response :: TaggedBusResponse inFlightTransactions
+                        response = TaggedBusResponse { tag = clientRequest.tag; busResponse = responseUnMapped }
+                    clientResponseArbiterSlot.request
+
+clientArbitSubmission :: (Add n (TLog numServers) (TLog (TAdd numServers 1)))
+                     => Integer
+                     -> FIFOF (TaggedBusRequest inFlightTransactions)
+                     -> FIFOF (TaggedBusResponse inFlightTransactions)
+                     -> Arbiter.Arbiter_IFC (TAdd numServers 1)
+                     -> Vector numServers (FIFOF (MkClientTagType numClients, TaggedBusResponse inFlightTransactions))
+                     -> Rules
+clientArbitSubmission clientIdx clientReqQueue clientRespQueue clientRespArbiter submitRespQueues =
+    let grantedIdx :: UInt (TLog (TAdd numServers 1))
+        grantedIdx = unpack clientRespArbiter.grant_id
+
+        selectedServerInterface :: ArbiterClient_IFC
+        selectedServerInterface = select clientRespArbiter.clients grantedIdx
+    in
+    rules
+        (sprintf "client[%d] arbit submission" clientIdx): when selectedServerInterface.grant ==> do
+            let isClientRequest :: Bool
+                isClientRequest = grantedIdx == fromInteger (valueOf numServers)
+            if isClientRequest then do
+                let clientRequest :: TaggedBusRequest inFlightTransactions
+                    clientRequest = clientReqQueue.first
+
+                    responseUnMapped :: BusResponse
+                    responseUnMapped = case clientRequest.busRequest of
+                        BusReadRequest _ -> BusReadResponse (Left UnMapped)
+                        BusWriteRequest _ -> BusWriteResponse (Left UnMapped)
+
+                    response :: TaggedBusResponse inFlightTransactions
+                    response = TaggedBusResponse { tag = clientRequest.tag; busResponse = responseUnMapped }
+                clientRespQueue.enq response
+                clientReqQueue.deq
+            else do
+                let grantedServerIdx :: MkServerIdx numServers
+                    grantedServerIdx = truncate grantedIdx
+
+                    selectedSubmitRespQueue :: FIFOF (MkClientTagType numClients, TaggedBusResponse inFlightTransactions)
+                    selectedSubmitRespQueue = select submitRespQueues grantedServerIdx
+
+                    response :: (MkClientTagType numClients, TaggedBusResponse inFlightTransactions)
+                    response = selectedSubmitRespQueue.first
+                clientRespQueue.enq response.snd
+                selectedSubmitRespQueue.deq

bs/Bus/Server.bs

@@ -0,0 +1,57 @@
+package Server(
+    serverArbitRequests,
+    serverRouteResponse
+) where
+
+import Types
+import BusTypes
+import TagEngine
+import Vector
+import Util
+import Arbiter
+import FIFO
+import FIFOF
+import SpecialFIFOs
+import Printf
+
+serverRouteResponse :: Integer
+                   -> FIFOF (MkClientTagType numClients, TaggedBusResponse inFlightTransactions)
+                   -> Vector numClients (Arbiter.Arbiter_IFC (TAdd numServers 1))
+                   -> Rules
+serverRouteResponse serverIdx submitRespQueue responseArbiterByClient =
+    rules
+        (sprintf "server[%d] route response" serverIdx): when True ==> do
+            let response :: (MkClientTagType numClients, TaggedBusResponse inFlightTransactions)
+                response = submitRespQueue.first
+
+                clientTag :: MkClientTagType numClients
+                clientTag = response.fst
+
+                targetClientRespArbiter :: Arbiter.Arbiter_IFC (TAdd numServers 1)
+                targetClientRespArbiter = select responseArbiterByClient clientTag
+
+                arbiterClientSlot :: Arbiter.ArbiterClient_IFC
+                arbiterClientSlot = select targetClientRespArbiter.clients serverIdx
+            arbiterClientSlot.request
+
+serverArbitRequests :: Integer
+                   -> Arbiter.Arbiter_IFC numClients
+                   -> FIFOF (MkClientTagType numClients, TaggedBusRequest inFlightTransactions)
+                   -> Vector numClients (FIFOF (TaggedBusRequest inFlightTransactions))
+                   -> Rules
+serverArbitRequests serverIdx serverArbiter consumeReqQueue clientReqQueues =
+    let grantedClientIdx :: MkClientTagType numClients
+        grantedClientIdx = unpack serverArbiter.grant_id
+
+        selectedClientInterface :: ArbiterClient_IFC
+        selectedClientInterface = select serverArbiter.clients grantedClientIdx
+    in
+    rules
+        (sprintf "server[%d] arbit requests" serverIdx): when selectedClientInterface.grant ==> do
+            let selectedClientReqQueue :: FIFOF (TaggedBusRequest inFlightTransactions)
+                selectedClientReqQueue = select clientReqQueues grantedClientIdx
+
+                clientRequest :: TaggedBusRequest inFlightTransactions
+                clientRequest = selectedClientReqQueue.first
+            consumeReqQueue.enq (grantedClientIdx, clientRequest)
+            selectedClientReqQueue.deq

bs/BusTypes.bs

@@ -1,68 +0,0 @@
-package BusTypes(
-    BusVal(..),
-    BusError(..),
-    TransactionSize(..),
-    ReadRequest(..),
-    WriteRequest(..)
-    ) where
-
-import Types
-
-data BusError
-    = UnMapped
-    | UnAligned
-    deriving (Bits, Eq, FShow)
-
-data TransactionSize
-    = SizeByte
-    | SizeHalfWord
-    | SizeFullWord
-    | SizeDoubleWord
-    | SizeQuadWord
-    deriving (Bits, Eq, FShow)
-
-data BusVal
-    = BusByte Byte
-    | BusHalfWord HalfWord
-    | BusFullWord FullWord
-    | BusDoubleWord DoubleWord
-    | BusQuadWord QuadWord
-    deriving (Bits, Eq, FShow)
-
-data ReadRequest = ReadRequest Addr TransactionSize
-    deriving (Bits, Eq, FShow)
-
-data WriteRequest = WriteRequest Addr BusVal
-    deriving (Bits, Eq, FShow)
-
-type ReadResponse = Either BusError BusVal
-type WriteResponse = Either BusError ()
-
-data BusRequest
-  = BusReadRequest      ReadRequest
-  | WriteReadRequest    WriteRequest
-  deriving (Bits, Eq, FShow)
-
-data BusResponse
-  = BusReadResponse     ReadResponse
-  | BusWriteResponse    WriteResponse
-  deriving (Bits, Eq, FShow)
-
-interface BusMaster =
-  -- The Bus arbiter will call the Bus Master's request method
-  -- if and only if it's the Bus Master's turn to make a request, and the Bus Master
-  -- has a request to make.
-  -- It is up to the BusMaster to guard it's request method such that calling
-  -- it's request method is only valid when the BusMaster has a request to make.
-  -- This has implications about for the implementor of BusMaster, namely, that it
-  -- should hold its request until it's request method gets called.
-  request  :: BusRequest
-  -- From the masters's perspective, the response should not be called until
-  -- the client is ready to accept the response. In other words, response
-  -- should be guarded by the client.
-  response :: BusResponse -> Action
-
-type Token = UInt 5
-
-a :: UInt 5
-a = 3

bs/ClkDivider.bs

@@ -1,4 +1,8 @@
-package ClkDivider(mkClkDivider, ClkDivider(..)) where
+package ClkDivider(
+  mkClkDivider,
+  MkClkDivType,
+  ClkDivider(..)
+  ) where
 
 interface (ClkDivider :: # -> *) hi =
   {
@@ -7,11 +11,13 @@ interface (ClkDivider :: # -> *) hi =
   ;isHalfCycle :: Bool
   }
 
+type MkClkDivType maxCycles = (UInt (TLog (TAdd 1 maxCycles)))
+
 mkClkDivider :: Handle -> Module (ClkDivider hi)
 mkClkDivider fileHandle = do
-    counter <- mkReg(0 :: UInt (TLog hi))
+    counter <- mkReg(0 :: MkClkDivType hi)
-    let hi_value :: UInt (TLog hi) = (fromInteger $ valueOf hi)
+    let hi_value :: (MkClkDivType hi) = (fromInteger $ valueOf hi)
-    let half_hi_value :: UInt (TLog hi) = (fromInteger $ valueOf (TDiv hi 2))
+    let half_hi_value :: (MkClkDivType hi) = (fromInteger $ valueOf (TDiv hi 2))
 
     let val :: Real = (fromInteger $ valueOf hi)
     let msg = "Clock Div Period : " + (realToString val) + "\n"

bs/Core.bs

@@ -11,13 +11,13 @@ interface (Core :: # -> *) clkFreq = {
 
 mkCore :: Module (Core clkFreq)
 mkCore = do
-  counter    :: Reg (UInt (TLog clkFreq)) <- mkReg 0
+  counter    :: Reg (MkClkDivType clkFreq) <- mkReg 0
   tickSecond :: Wire Bool    <- mkDWire False
   uartOut    :: Wire (Bit 8) <- mkWire;
   ledOut     :: Reg (Bit 8)  <- mkReg 0
 
   let clkFreqInt :: Integer = valueOf clkFreq
-  let clkFreqUInt :: UInt (TLog clkFreq) = fromInteger clkFreqInt
+  let clkFreqUInt :: (MkClkDivType clkFreq) = fromInteger clkFreqInt
   let val :: Real = fromInteger clkFreqInt
 
   messageM $ "mkCore clkFreq" + realToString val

bs/TagEngine.bs

@@ -1,81 +1,113 @@
 package TagEngine(
+    MkTagType,
     TagEngine(..),
     Util.BasicResult(..),
     mkTagEngine) where
 
 import Vector
 import Util
+import FIFO
+import SpecialFIFOs
 
-#define UIntLog2N(n) (UInt (TLog n))
+type MkTagType numTags = (UInt (TLog (TAdd 1 numTags)))
 
 interface (TagEngine :: # -> *) numTags =
-    requestTag :: ActionValue UIntLog2N(numTags)
+    requestTag :: ActionValue (MkTagType numTags)
-    retireTag  :: UIntLog2N(numTags) -> ActionValue BasicResult
+    retireTag  :: (MkTagType numTags) -> Action
 
 -- The tag engine returns a tag that is unique for the duration of
 -- the lifetime of the tag. Useful when you need to tag transactions
 -- on a bus for example.
--- This implementation is stack based.
+-- This implementation is FIFO based.
 mkTagEngine :: Module (TagEngine numTags)
-mkTagEngine =
+mkTagEngine = do
-    do
+    -- Constants
-        let reifiedNumTags = fromInteger |> valueOf numTags
+    let maxTagCount = fromInteger (valueOf numTags)
 
-        freeStackVec :: Vector numTags (Reg UIntLog2N(numTags))
+    tagUsage :: Vector numTags (Reg Bool) <- replicateM (mkReg False)  -- Tracks which tags are in use
-        freeStackVec <- mapM (\i -> mkReg |> fromInteger i) genVector
 
-        inUseVec :: Vector numTags (Reg Bool)
+    -- Since Bluespec doesn't allow us to initialize FIFOs with values at
-        inUseVec <- replicateM |> mkReg False
+    -- reset, we can pretend as if the buffer within our freeTagQueue is populated
+    -- with sequentially incrementing values(starting from 0) on reset
+    -- by having our tag engine effectively return the value of a decrementing
+    -- counter initialized to (maxTagCount - 1) for the first n tag requests made
+    -- to TagEngine where `n := maxTagCount`.
+    initialTagDistributor <- mkReg (Just (maxTagCount - 1))  -- Distributes initial tags
+    retireQueue <- mkBypassFIFO  -- Queue for tags being retired
+    freeTagQueue <- mkSizedFIFO maxTagCount  -- Queue of available tags
 
-        stackPtr :: (Reg (Maybe(UIntLog2N(numTags))))
+    -- Signals
-        stackPtr <- mkReg |> Just |> reifiedNumTags - 1
+    retireSignal <- mkRWire  -- Signals a tag retirement
+    requestSignal <- mkRWire  -- Signals a tag request
 
+    -- Debug
     debugOnce <- mkReg True
 
-        addRules $
+    -- Rules
+    addRules |>
         rules
-                "display": when (debugOnce == True) ==>
+            "debug_initial_state": when debugOnce ==> do
-                    do
+                $display "tagUsage: " (fshow (readVReg tagUsage))
-                        $display "freeStackVec : " (fshow |> readVReg freeStackVec)
-                        $display "inUseVec : " (fshow |> readVReg inUseVec)
-                        $display "stackPtr : " (fshow stackPtr)
                 debugOnce := False
 
-        counter <- mkReg(0 :: UIntLog2N(numTags))
+            "retire_tag": when True ==> do
-        return $
+                let tag = retireQueue.first
+                $display "Retiring tag: " (fshow tag)
+                retireQueue.deq
+                freeTagQueue.enq tag
+                retireSignal.wset tag
+
+            -- Combined update rules (simplified below)
+            "update_usage": when True ==> do
+                let mRetireTag = retireSignal.wget
+                    mRequestTag = requestSignal.wget
+                case (mRetireTag, mRequestTag) of
+                    (Just retireTag, Just requestTag) -> do
+                        let usage = readVReg tagUsage
+                            usage' = update usage requestTag True
+                            usage'' = update usage' retireTag False
+                        writeVReg tagUsage usage''
+                        $display $time " Updated usage (request + retire): " (fshow |> readVReg tagUsage)
+                    (Just retireTag, Nothing) -> do
+                        (select tagUsage retireTag) := False
+                        $display $time " Updated usage (retire): " (fshow (readVReg tagUsage))
+                    (Nothing, Just requestTag) -> do
+                        (select tagUsage requestTag) := True
+                        $display $time " Updated usage (request): " (fshow (readVReg tagUsage))
+                    (Nothing, Nothing) -> action {}
+
+    -- Interface
+    return |>
         interface TagEngine
+            requestTag :: ActionValue (MkTagType numTags)
+            requestTag = do
+                case initialTagDistributor of
+                    Just 0 -> do
+                        initialTagDistributor := Nothing
+                        requestSignal.wset 0
+                        return 0
+                    Just tag -> do
+                        initialTagDistributor := Just (tag - 1)
+                        requestSignal.wset tag
+                        return tag
+                    Nothing -> do
+                        let tag = freeTagQueue.first
+                        freeTagQueue.deq
+                        requestSignal.wset tag
+                        return tag
 
-            requestTag :: ActionValue UIntLog2N(numTags)
+            -- `retireTag` isn't guarded on tag validity(this would break Bluespec's safety model)
-            requestTag =
+            -- so it is advisable that the caller of `retireTag` only attempt to retire valid tags.
-                do
+            -- Internally, the tagEngine will keep a correct and consistent state since TagEngine
-                    stackPtr :=
+            -- validates tags before attempting to retire them.
-                        if sampledStackPtr == 0
+            retireTag :: (MkTagType numTags) -> Action
-                            then Nothing
-                            else Just |> sampledStackPtr - 1
-                    (select inUseVec sampledStackPtr) := True
-                    return |> readReg (select freeStackVec sampledStackPtr)
-                when
-                    Just sampledStackPtr <- stackPtr
-
-            -- retireTag isn't guarded so its up to external module to only attempt to
-            -- retire valid tags... At any rate, we can notify the requestor of failures
-            -- to retire tags - although the requestor can merely ignore this
-            -- notification.
-            retireTag :: UIntLog2N(numTags) -> ActionValue BasicResult
             retireTag tag =
                 do
                     let
-                        tagValid = tag < reifiedNumTags
+                        tagValid = tag < maxTagCount
-                        tagInUse = readReg (select inUseVec tag)
+                        tagInUse = readReg (select tagUsage tag)
-                        nextStackPtrUint =
-                            case stackPtr of
-                                Nothing -> 0
-                                Just n -> n + 1
                     if (tagValid && tagInUse)
                         then do
-                            (select inUseVec tag) := False
+                            retireQueue.enq tag
-                            (select freeStackVec nextStackPtrUint) := tag
-                            stackPtr := Just nextStackPtrUint
-                            return Success
                         else do
-                            return Failure
+                            action {}

bs/Tests/TagEngineTester.bs

@@ -0,0 +1,64 @@
+package TagEngineTester(mkTagEngineTester) where
+
+import TagEngine
+import ActionSeq
+
+mkTagEngineTester :: Module Empty
+mkTagEngineTester = do
+  tagEngine :: TagEngine 5 <- mkTagEngine
+  runOnce :: Reg Bool <- mkReg False
+
+  s :: ActionSeq
+  s <-
+    let
+      requestTagAction :: Action
+      requestTagAction =
+        do
+          tag <- tagEngine.requestTag
+          $display $time " got tag : " (fshow tag)
+
+      retireTagAction :: UInt 3 -> Action
+      retireTagAction tag =
+        do
+          res <- tagEngine.retireTag tag
+          $display $time " retiring tag : " (fshow tag) " " (fshow res)
+          action {}
+
+    in
+      actionSeq $
+      do requestTagAction
+      |> do requestTagAction
+      |> do requestTagAction
+      |> do requestTagAction
+      |> do requestTagAction
+      |> do retireTagAction 2
+      -- |> do $display "BEGIN TRY SIMULTANEOUS RETIRE and REQUEST"
+      |> do
+          retireTagAction 4
+          requestTagAction
+      -- |> do $display "END TRY SIMULTANEOUS RETIRE and REQUEST"
+      -- |> do $display "BEGIN TRY SIMULTANEOUS RETIRE and REQUEST"
+      |> do
+          retireTagAction 4
+          requestTagAction
+      -- |> do $display "END TRY SIMULTANEOUS RETIRE and REQUEST"
+      |> do $finish
+      -- |> do retireTagAction 4
+      -- |> do retireTagAction 4
+      -- |> do retireTagAction 0
+      -- |> do requestTagAction
+      -- |> do requestTagAction
+      -- |> do retireTagAction 1
+      -- |> do requestTagAction
+      -- |> do $finish
+
+  addRules $
+    rules
+      -- "counter": when True ==>
+      --   do
+      --     count := count + 1
+      --     $display "count : " (fshow count)
+      "testIncrement": when (runOnce == False) ==>
+        do
+          s.start
+          runOnce := True

bs/Top.bs

@@ -10,6 +10,11 @@ import TagEngine
 import List
 import ActionSeq
 
+import Vector
+import BusTypes
+
+import TagEngineTester
+
 type FCLK = 25000000
 type BAUD = 9600
 
@@ -19,44 +24,6 @@ interface ITop = {
  ;ftdi_txd :: Bit 1 -> Action {-# always_ready , always_enabled  #-}
 };
 
-interface BusClient =
-  request  :: Bit 1
-  response :: Bit 1 -> Action
-
-mkBusClient :: Module BusClient
-mkBusClient = module
-  reqReg :: Reg (Bit 1) <- mkReg 0
-  return $
-    interface BusClient
-      request = reqReg
-      response resp = do
-        reqReg := 0  -- Reset request after receiving response
-
-interface Bus =
-  request  :: Bit 1 -> Action
-  response :: Bit 1
-
-mkBus :: Module Bus
-mkBus = module
-  respReg :: Reg (Bit 1) <- mkReg 0
-  return $
-    interface Bus
-      request req = do
-        respReg := req  -- Simple pass-through for this example
-      response = respReg
-
--- -- Function to connect Bus to BusClient
-connectBusToClient :: Bus -> BusClient -> Rules
-connectBusToClient bus client =
-  rules
-    "busConnection": when True ==> do
-      bus.request client.request
-      client.response bus.response
-
--- need to implement mkBus
-
--- need function that can connect Bus to BusClient
-
 mkTop :: Module ITop
 mkTop = do
   fileHandle   :: Handle <- openFile "compile.log" WriteMode
@@ -64,17 +31,9 @@ mkTop = do
   serializer   :: ISerializer FCLK BAUD <- mkSerialize fileHandle
   core         :: Core FCLK <- mkCore
 
-  bus          :: Bus <- mkBus
-  busClient    :: BusClient <- mkBusClient
-  let a :: List Integer = 1 :> 2 :> Nil
-      b = length a
-
   persistLed  :: Reg (Bit 8) <- mkReg 0
   messageM $ "Hallo!!" + (realToString 5)
 
-  -- need to instantiate a Bus and BusClient
-  addRules $ connectBusToClient bus busClient
-
   addRules $
     rules
       -- need new rule that always connects Bus to BusClient
@@ -100,58 +59,19 @@ mkTop = do
 
 mkSim :: Module Empty
 mkSim = do
-  let cfg          :: BRAM_Configure = defaultValue
+  _ :: Empty <- mkTagEngineTester
-
+  initCFunctions :: Reg Bool <- mkReg False
-  tagEngine :: TagEngine 5 <- mkTagEngine
+  core             :: Core FCLK <- mkCore
-  count            :: Reg (UInt 4) <- mkReg 0;
+  let busMap _ = Just 0
-  initCFunctions :: Reg Bool <- mkReg False;
+  bus :: (Bus 4 2 2) <- mkBus busMap
-  core             :: Core FCLK <- mkCore;
-
-  s :: ActionSeq
-  s <- actionSeq
-    $  do
-         $display "got tag : " tagEngine.requestTag
-    |> do
-         $display "got tag : " tagEngine.requestTag
-    |> do
-         $display "got tag : " tagEngine.requestTag
-    |> do
-         res <- tagEngine.retireTag 3
-         $display "retiring tag :   3 " (fshow res)
-         action {}
-    |> do
-         $display "got tag : " tagEngine.requestTag
-    |> do
-         $display "got tag : " tagEngine.requestTag
-    |> do
-         res <- tagEngine.retireTag 4
-         $display "retiring tag :   4 " (fshow res)
-         action {}
-    |> do
-         res <- tagEngine.retireTag 4
-         $display "retiring tag :   4 " (fshow res)
-         action {}
-    |> do
-         res <- tagEngine.retireTag 0
-         $display "retiring tag :   0 " (fshow res)
-         action {}
-    |> do
-         $display "got tag : " tagEngine.requestTag
-    |> do
-         $display "got tag : " tagEngine.requestTag
-    |> do
-         res <- tagEngine.retireTag 1
-         $display "retiring tag :   1 " (fshow res)
-         action {}
-    |> do
-         $display "got tag : " tagEngine.requestTag
 
   addRules $
     rules
-      "testIncrement": when (count < 10) ==>
+      "test bus": when True ==>
         do
-          count := count + 1
+          let server = (Vector.select bus.servers 0)
-          s.start
+          result <- server.consumeRequest
+          $display "Top.bs:74" (fshow result)
       "initCFunctionsOnce":  when not initCFunctions ==>
         do
           initTerminal

diagrams/bus.drawio

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