src/mem/ruby/protocol/MI_example-dir.sm - public/gem5 - Git at Google

 /*
  * Copyright (c) 2009-2012 Mark D. Hill and David A. Wood
  * Copyright (c) 2010-2012 Advanced Micro Devices, Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met: redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer;
  * redistributions in binary form must reproduce the above copyright
  * notice, this list of conditions and the following disclaimer in the
  * documentation and/or other materials provided with the distribution;
  * neither the name of the copyright holders nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 machine(MachineType:Directory, "Directory protocol")
     : DirectoryMemory * directory;
       Cycles directory_latency := 12;
       Cycles to_memory_controller_latency := 1;

       MessageBuffer * forwardFromDir, network="To", virtual_network="3",
             vnet_type="forward";
       MessageBuffer * responseFromDir, network="To", virtual_network="4",
             vnet_type="response";
       MessageBuffer * dmaResponseFromDir, network="To", virtual_network="1",
             vnet_type="response";

       MessageBuffer * requestToDir, network="From", virtual_network="2",
             vnet_type="request";
       MessageBuffer * dmaRequestToDir, network="From", virtual_network="0",
             vnet_type="request";
       MessageBuffer * responseFromMemory;
 {
   // STATES
   state_declaration(State, desc="Directory states", default="Directory_State_I") {
     // Base states
     I, AccessPermission:Read_Write, desc="Invalid";
     M, AccessPermission:Invalid, desc="Modified";

     M_DRD, AccessPermission:Busy, desc="Blocked on an invalidation for a DMA read";
     M_DWR, AccessPermission:Busy, desc="Blocked on an invalidation for a DMA write";

     M_DWRI, AccessPermission:Busy, desc="Intermediate state M_DWR-->I";
     M_DRDI, AccessPermission:Busy, desc="Intermediate state M_DRD-->I";

     IM, AccessPermission:Busy, desc="Intermediate state I-->M";
     MI, AccessPermission:Busy, desc="Intermediate state M-->I";
     ID, AccessPermission:Busy, desc="Intermediate state for DMA_READ when in I";
     ID_W, AccessPermission:Busy, desc="Intermediate state for DMA_WRITE when in I";
   }

   // Events
   enumeration(Event, desc="Directory events") {
     // processor requests
     GETX, desc="A GETX arrives";
     GETS, desc="A GETS arrives";
     PUTX, desc="A PUTX arrives";
     PUTX_NotOwner, desc="A PUTX arrives";

     // DMA requests
     DMA_READ, desc="A DMA Read memory request";
     DMA_WRITE, desc="A DMA Write memory request";

     // Memory Controller
     Memory_Data, desc="Fetched data from memory arrives";
     Memory_Ack, desc="Writeback Ack from memory arrives";
   }

   // TYPES

   // DirectoryEntry
   structure(Entry, desc="...", interface="AbstractCacheEntry", main="false") {
     State DirectoryState,          desc="Directory state";
     NetDest Sharers,                   desc="Sharers for this block";
     NetDest Owner,                     desc="Owner of this block";
   }

   // TBE entries for DMA requests
   structure(TBE, desc="TBE entries for outstanding DMA requests") {
     Addr PhysicalAddress, desc="physical address";
     State TBEState,        desc="Transient State";
     DataBlock DataBlk,     desc="Data to be written (DMA write only)";
     int Len,               desc="...";
     MachineID DmaRequestor, desc="DMA requestor";
   }

   structure(TBETable, external="yes") {
     TBE lookup(Addr);
     void allocate(Addr);
     void deallocate(Addr);
     bool isPresent(Addr);
   }

   // ** OBJECTS **
   TBETable TBEs, template="<Directory_TBE>", constructor="m_number_of_TBEs";

   Tick clockEdge();
   Cycles ticksToCycles(Tick t);
   Tick cyclesToTicks(Cycles c);
   void set_tbe(TBE b);
   void unset_tbe();

   Entry getDirectoryEntry(Addr addr), return_by_pointer="yes" {
     Entry dir_entry := static_cast(Entry, "pointer", directory[addr]);

     if (is_valid(dir_entry)) {
       return dir_entry;
     }

     dir_entry :=  static_cast(Entry, "pointer",
                               directory.allocate(addr, new Entry));
     return dir_entry;
   }

   State getState(TBE tbe, Addr addr) {
     if (is_valid(tbe)) {
       return tbe.TBEState;
     } else if (directory.isPresent(addr)) {
       return getDirectoryEntry(addr).DirectoryState;
     } else {
       return State:I;
     }
   }

   void setState(TBE tbe, Addr addr, State state) {

     if (is_valid(tbe)) {
       tbe.TBEState := state;
     }

     if (directory.isPresent(addr)) {

       if (state == State:M) {
         assert(getDirectoryEntry(addr).Owner.count() == 1);
         assert(getDirectoryEntry(addr).Sharers.count() == 0);
       }

       getDirectoryEntry(addr).DirectoryState := state;

       if (state == State:I)  {
         assert(getDirectoryEntry(addr).Owner.count() == 0);
         assert(getDirectoryEntry(addr).Sharers.count() == 0);
       }
     }
   }

   AccessPermission getAccessPermission(Addr addr) {
     TBE tbe := TBEs[addr];
     if(is_valid(tbe)) {
       return Directory_State_to_permission(tbe.TBEState);
     }

     if(directory.isPresent(addr)) {
       return Directory_State_to_permission(getDirectoryEntry(addr).DirectoryState);
     }

     return AccessPermission:NotPresent;
   }

   void setAccessPermission(Addr addr, State state) {
     if (directory.isPresent(addr)) {
       getDirectoryEntry(addr).changePermission(Directory_State_to_permission(state));
     }
   }

   void functionalRead(Addr addr, Packet *pkt) {
     TBE tbe := TBEs[addr];
     if(is_valid(tbe)) {
       testAndRead(addr, tbe.DataBlk, pkt);
     } else {
       functionalMemoryRead(pkt);
     }
   }

   int functionalWrite(Addr addr, Packet *pkt) {
     int num_functional_writes := 0;

     TBE tbe := TBEs[addr];
     if(is_valid(tbe)) {
       num_functional_writes := num_functional_writes +
             testAndWrite(addr, tbe.DataBlk, pkt);
     }

     num_functional_writes := num_functional_writes + functionalMemoryWrite(pkt);
     return num_functional_writes;
   }

   // ** OUT_PORTS **
   out_port(forwardNetwork_out, RequestMsg, forwardFromDir);
   out_port(responseNetwork_out, ResponseMsg, responseFromDir);
   out_port(requestQueue_out, ResponseMsg, requestToDir); // For recycling requests
   out_port(dmaResponseNetwork_out, DMAResponseMsg, dmaResponseFromDir);

   // ** IN_PORTS **
   in_port(dmaRequestQueue_in, DMARequestMsg, dmaRequestToDir) {
     if (dmaRequestQueue_in.isReady(clockEdge())) {
       peek(dmaRequestQueue_in, DMARequestMsg) {
         TBE tbe := TBEs[in_msg.LineAddress];
         if (in_msg.Type == DMARequestType:READ) {
           trigger(Event:DMA_READ, in_msg.LineAddress, tbe);
         } else if (in_msg.Type == DMARequestType:WRITE) {
           trigger(Event:DMA_WRITE, in_msg.LineAddress, tbe);
         } else {
           error("Invalid message");
         }
       }
     }
   }

   in_port(requestQueue_in, RequestMsg, requestToDir) {
     if (requestQueue_in.isReady(clockEdge())) {
       peek(requestQueue_in, RequestMsg) {
         TBE tbe := TBEs[in_msg.addr];
         if (in_msg.Type == CoherenceRequestType:GETS) {
           trigger(Event:GETS, in_msg.addr, tbe);
         } else if (in_msg.Type == CoherenceRequestType:GETX) {
           trigger(Event:GETX, in_msg.addr, tbe);
         } else if (in_msg.Type == CoherenceRequestType:PUTX) {
           if (getDirectoryEntry(in_msg.addr).Owner.isElement(in_msg.Requestor)) {
             trigger(Event:PUTX, in_msg.addr, tbe);
           } else {
             trigger(Event:PUTX_NotOwner, in_msg.addr, tbe);
           }
         } else {
           error("Invalid message");
         }
       }
     }
   }

 //added by SS
   // off-chip memory request/response is done
   in_port(memQueue_in, MemoryMsg, responseFromMemory) {
     if (memQueue_in.isReady(clockEdge())) {
       peek(memQueue_in, MemoryMsg) {
         TBE tbe := TBEs[in_msg.addr];
         if (in_msg.Type == MemoryRequestType:MEMORY_READ) {
           trigger(Event:Memory_Data, in_msg.addr, tbe);
         } else if (in_msg.Type == MemoryRequestType:MEMORY_WB) {
           trigger(Event:Memory_Ack, in_msg.addr, tbe);
         } else {
           DPRINTF(RubySlicc,"%s\n", in_msg.Type);
           error("Invalid message");
         }
       }
     }
   }

   // Actions

   action(a_sendWriteBackAck, "a", desc="Send writeback ack to requestor") {
     peek(requestQueue_in, RequestMsg) {
       enqueue(forwardNetwork_out, RequestMsg, directory_latency) {
         out_msg.addr := address;
         out_msg.Type := CoherenceRequestType:WB_ACK;
         out_msg.Requestor := in_msg.Requestor;
         out_msg.Destination.add(in_msg.Requestor);
         out_msg.MessageSize := MessageSizeType:Writeback_Control;
       }
     }
   }

   action(l_sendWriteBackAck, "la", desc="Send writeback ack to requestor") {
     peek(memQueue_in, MemoryMsg) {
       enqueue(forwardNetwork_out, RequestMsg, 1) {
         out_msg.addr := address;
         out_msg.Type := CoherenceRequestType:WB_ACK;
         out_msg.Requestor := in_msg.OriginalRequestorMachId;
         out_msg.Destination.add(in_msg.OriginalRequestorMachId);
         out_msg.MessageSize := MessageSizeType:Writeback_Control;
       }
     }
   }

   action(b_sendWriteBackNack, "b", desc="Send writeback nack to requestor") {
     peek(requestQueue_in, RequestMsg) {
       enqueue(forwardNetwork_out, RequestMsg, directory_latency) {
         out_msg.addr := address;
         out_msg.Type := CoherenceRequestType:WB_NACK;
         out_msg.Requestor := in_msg.Requestor;
         out_msg.Destination.add(in_msg.Requestor);
         out_msg.MessageSize := MessageSizeType:Writeback_Control;
       }
     }
   }

   action(c_clearOwner, "c", desc="Clear the owner field") {
     getDirectoryEntry(address).Owner.clear();
   }

   action(d_sendData, "d", desc="Send data to requestor") {
     peek(memQueue_in, MemoryMsg) {
       enqueue(responseNetwork_out, ResponseMsg, 1) {
         out_msg.addr := address;
         out_msg.Type := CoherenceResponseType:DATA;
         out_msg.Sender := machineID;
         out_msg.Destination.add(in_msg.OriginalRequestorMachId);
         out_msg.DataBlk := in_msg.DataBlk;
         out_msg.MessageSize := MessageSizeType:Response_Data;
       }
     }
   }

   action(dr_sendDMAData, "dr", desc="Send Data to DMA controller from directory") {
     peek(memQueue_in, MemoryMsg) {
       enqueue(dmaResponseNetwork_out, DMAResponseMsg, 1) {
         assert(is_valid(tbe));
         out_msg.PhysicalAddress := address;
         out_msg.LineAddress := address;
         out_msg.Type := DMAResponseType:DATA;
         out_msg.DataBlk := in_msg.DataBlk;   // we send the entire data block and rely on the dma controller to split it up if need be
         out_msg.Destination.add(tbe.DmaRequestor);
         out_msg.MessageSize := MessageSizeType:Response_Data;
       }
     }
   }


   action(drp_sendDMAData, "drp", desc="Send Data to DMA controller from incoming PUTX") {
     peek(requestQueue_in, RequestMsg) {
       enqueue(dmaResponseNetwork_out, DMAResponseMsg, 1) {
         assert(is_valid(tbe));
         out_msg.PhysicalAddress := address;
         out_msg.LineAddress := address;
         out_msg.Type := DMAResponseType:DATA;

         // we send the entire data block and rely on the dma controller
         // to split it up if need be
         out_msg.DataBlk := in_msg.DataBlk;
         out_msg.Destination.add(tbe.DmaRequestor);
         out_msg.MessageSize := MessageSizeType:Response_Data;
       }
     }
   }

   action(da_sendDMAAck, "da", desc="Send Ack to DMA controller") {
       enqueue(dmaResponseNetwork_out, DMAResponseMsg, 1) {
         assert(is_valid(tbe));
         out_msg.PhysicalAddress := address;
         out_msg.LineAddress := address;
         out_msg.Type := DMAResponseType:ACK;
         out_msg.Destination.add(tbe.DmaRequestor);
         out_msg.MessageSize := MessageSizeType:Writeback_Control;
       }
   }

   action(e_ownerIsRequestor, "e", desc="The owner is now the requestor") {
     peek(requestQueue_in, RequestMsg) {
       getDirectoryEntry(address).Owner.clear();
       getDirectoryEntry(address).Owner.add(in_msg.Requestor);
     }
   }

   action(f_forwardRequest, "f", desc="Forward request to owner") {
     peek(requestQueue_in, RequestMsg) {
       APPEND_TRANSITION_COMMENT("Own: ");
       APPEND_TRANSITION_COMMENT(getDirectoryEntry(in_msg.addr).Owner);
       APPEND_TRANSITION_COMMENT("Req: ");
       APPEND_TRANSITION_COMMENT(in_msg.Requestor);
       enqueue(forwardNetwork_out, RequestMsg, directory_latency) {
         out_msg.addr := address;
         out_msg.Type := in_msg.Type;
         out_msg.Requestor := in_msg.Requestor;
         out_msg.Destination := getDirectoryEntry(in_msg.addr).Owner;
         out_msg.MessageSize := MessageSizeType:Writeback_Control;
       }
     }
   }

   action(inv_sendCacheInvalidate, "inv", desc="Invalidate a cache block") {
     peek(dmaRequestQueue_in, DMARequestMsg) {
       enqueue(forwardNetwork_out, RequestMsg, directory_latency) {
         out_msg.addr := address;
         out_msg.Type := CoherenceRequestType:INV;
         out_msg.Requestor := machineID;
         out_msg.Destination := getDirectoryEntry(in_msg.PhysicalAddress).Owner;
         out_msg.MessageSize := MessageSizeType:Writeback_Control;
       }
     }
   }

   action(i_popIncomingRequestQueue, "i", desc="Pop incoming request queue") {
     requestQueue_in.dequeue(clockEdge());
   }

   action(p_popIncomingDMARequestQueue, "p", desc="Pop incoming DMA queue") {
     dmaRequestQueue_in.dequeue(clockEdge());
   }

   action(v_allocateTBE, "v", desc="Allocate TBE") {
     peek(dmaRequestQueue_in, DMARequestMsg) {
       TBEs.allocate(address);
       set_tbe(TBEs[address]);
       tbe.DataBlk := in_msg.DataBlk;
       tbe.PhysicalAddress := in_msg.PhysicalAddress;
       tbe.Len := in_msg.Len;
       tbe.DmaRequestor := in_msg.Requestor;
     }
   }

   action(r_allocateTbeForDmaRead, "\r", desc="Allocate TBE for DMA Read") {
     peek(dmaRequestQueue_in, DMARequestMsg) {
       TBEs.allocate(address);
       set_tbe(TBEs[address]);
       tbe.DmaRequestor := in_msg.Requestor;
     }
   }

   action(v_allocateTBEFromRequestNet, "\v", desc="Allocate TBE") {
     peek(requestQueue_in, RequestMsg) {
       TBEs.allocate(address);
       set_tbe(TBEs[address]);
       tbe.DataBlk := in_msg.DataBlk;
     }
   }

   action(w_deallocateTBE, "w", desc="Deallocate TBE") {
     TBEs.deallocate(address);
     unset_tbe();
   }

   action(z_recycleRequestQueue, "z", desc="recycle request queue") {
     requestQueue_in.recycle(clockEdge(), cyclesToTicks(recycle_latency));
   }

   action(y_recycleDMARequestQueue, "y", desc="recycle dma request queue") {
     dmaRequestQueue_in.recycle(clockEdge(), cyclesToTicks(recycle_latency));
   }


   action(qf_queueMemoryFetchRequest, "qf", desc="Queue off-chip fetch request") {
     peek(requestQueue_in, RequestMsg) {
       queueMemoryRead(in_msg.Requestor, address, to_memory_controller_latency);
     }
   }

   action(qf_queueMemoryFetchRequestDMA, "qfd", desc="Queue off-chip fetch request") {
     peek(dmaRequestQueue_in, DMARequestMsg) {
       queueMemoryRead(in_msg.Requestor, address, to_memory_controller_latency);
     }
   }

   action(qw_queueMemoryWBRequest_partial, "qwp", desc="Queue off-chip writeback request") {
     peek(dmaRequestQueue_in, DMARequestMsg) {
       queueMemoryWritePartial(in_msg.Requestor, address,
                               to_memory_controller_latency, in_msg.DataBlk,
                               in_msg.Len);
     }
   }

   action(qw_queueMemoryWBRequest_partialTBE, "qwt", desc="Queue off-chip writeback request") {
     peek(requestQueue_in, RequestMsg) {
       queueMemoryWritePartial(in_msg.Requestor, address,
                               to_memory_controller_latency, tbe.DataBlk,
                               tbe.Len);
     }
   }

   action(l_queueMemoryWBRequest, "lq", desc="Write PUTX data to memory") {
     peek(requestQueue_in, RequestMsg) {
       queueMemoryWrite(in_msg.Requestor, address, to_memory_controller_latency,
                        in_msg.DataBlk);
     }
   }

   action(l_popMemQueue, "q", desc="Pop off-chip request queue") {
     memQueue_in.dequeue(clockEdge());
   }

   // TRANSITIONS
   transition({M_DRD, M_DWR, M_DWRI, M_DRDI}, GETX) {
     z_recycleRequestQueue;
   }

   transition({IM, MI, ID, ID_W}, {GETX, GETS, PUTX, PUTX_NotOwner} ) {
     z_recycleRequestQueue;
   }

   transition({IM, MI, ID, ID_W}, {DMA_READ, DMA_WRITE} ) {
     y_recycleDMARequestQueue;
   }


   transition(I, GETX, IM) {
     //d_sendData;
     v_allocateTBEFromRequestNet;
     qf_queueMemoryFetchRequest;
     e_ownerIsRequestor;
     i_popIncomingRequestQueue;
   }

   transition(IM, Memory_Data, M) {
     d_sendData;
     //e_ownerIsRequestor;
     w_deallocateTBE;
     l_popMemQueue;
   }


   transition(I, DMA_READ, ID) {
     //dr_sendDMAData;
     r_allocateTbeForDmaRead;
     qf_queueMemoryFetchRequestDMA;
     p_popIncomingDMARequestQueue;
   }

   transition(ID, Memory_Data, I) {
     dr_sendDMAData;
     //p_popIncomingDMARequestQueue;
     w_deallocateTBE;
     l_popMemQueue;
   }


   transition(I, DMA_WRITE, ID_W) {
     v_allocateTBE;
     qw_queueMemoryWBRequest_partial;
     p_popIncomingDMARequestQueue;
   }

   transition(ID_W, Memory_Ack, I) {
     da_sendDMAAck;
     w_deallocateTBE;
     l_popMemQueue;
   }

   transition(M, DMA_READ, M_DRD) {
     v_allocateTBE;
     inv_sendCacheInvalidate;
     p_popIncomingDMARequestQueue;
   }

   transition(M_DRD, PUTX, M_DRDI) {
     drp_sendDMAData;
     c_clearOwner;
     l_queueMemoryWBRequest;
     i_popIncomingRequestQueue;
   }

   transition(M_DRDI, Memory_Ack, I) {
     l_sendWriteBackAck;
     w_deallocateTBE;
     l_popMemQueue;
   }


   transition(M, DMA_WRITE, M_DWR) {
     v_allocateTBE;
     inv_sendCacheInvalidate;
     p_popIncomingDMARequestQueue;
   }

   transition(M_DWR, PUTX, M_DWRI) {
     qw_queueMemoryWBRequest_partialTBE;
     c_clearOwner;
     i_popIncomingRequestQueue;
   }

   transition(M_DWRI, Memory_Ack, I) {
     l_sendWriteBackAck;
     da_sendDMAAck;
     w_deallocateTBE;
     l_popMemQueue;
   }

   transition(M, GETX, M) {
     f_forwardRequest;
     e_ownerIsRequestor;
     i_popIncomingRequestQueue;
   }

   transition(M, PUTX, MI) {
     c_clearOwner;
     v_allocateTBEFromRequestNet;
     l_queueMemoryWBRequest;
     i_popIncomingRequestQueue;
   }

   transition(MI, Memory_Ack, I) {
     l_sendWriteBackAck;
     w_deallocateTBE;
     l_popMemQueue;
   }

   transition(M, PUTX_NotOwner, M) {
     b_sendWriteBackNack;
     i_popIncomingRequestQueue;
   }

   transition(I, PUTX_NotOwner, I) {
     b_sendWriteBackNack;
     i_popIncomingRequestQueue;
   }
 }
	/*
	* Copyright (c) 2009-2012 Mark D. Hill and David A. Wood
	* Copyright (c) 2010-2012 Advanced Micro Devices, Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met: redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer;
	* redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution;
	* neither the name of the copyright holders nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	machine(MachineType:Directory, "Directory protocol")
	: DirectoryMemory * directory;
	Cycles directory_latency := 12;
	Cycles to_memory_controller_latency := 1;

	MessageBuffer * forwardFromDir, network="To", virtual_network="3",
	vnet_type="forward";
	MessageBuffer * responseFromDir, network="To", virtual_network="4",
	vnet_type="response";
	MessageBuffer * dmaResponseFromDir, network="To", virtual_network="1",
	vnet_type="response";

	MessageBuffer * requestToDir, network="From", virtual_network="2",
	vnet_type="request";
	MessageBuffer * dmaRequestToDir, network="From", virtual_network="0",
	vnet_type="request";
	MessageBuffer * responseFromMemory;
	{
	// STATES
	state_declaration(State, desc="Directory states", default="Directory_State_I") {
	// Base states
	I, AccessPermission:Read_Write, desc="Invalid";
	M, AccessPermission:Invalid, desc="Modified";

	M_DRD, AccessPermission:Busy, desc="Blocked on an invalidation for a DMA read";
	M_DWR, AccessPermission:Busy, desc="Blocked on an invalidation for a DMA write";

	M_DWRI, AccessPermission:Busy, desc="Intermediate state M_DWR-->I";
	M_DRDI, AccessPermission:Busy, desc="Intermediate state M_DRD-->I";

	IM, AccessPermission:Busy, desc="Intermediate state I-->M";
	MI, AccessPermission:Busy, desc="Intermediate state M-->I";
	ID, AccessPermission:Busy, desc="Intermediate state for DMA_READ when in I";
	ID_W, AccessPermission:Busy, desc="Intermediate state for DMA_WRITE when in I";
	}

	// Events
	enumeration(Event, desc="Directory events") {
	// processor requests
	GETX, desc="A GETX arrives";
	GETS, desc="A GETS arrives";
	PUTX, desc="A PUTX arrives";
	PUTX_NotOwner, desc="A PUTX arrives";

	// DMA requests
	DMA_READ, desc="A DMA Read memory request";
	DMA_WRITE, desc="A DMA Write memory request";

	// Memory Controller
	Memory_Data, desc="Fetched data from memory arrives";
	Memory_Ack, desc="Writeback Ack from memory arrives";
	}

	// TYPES

	// DirectoryEntry
	structure(Entry, desc="...", interface="AbstractCacheEntry", main="false") {
	State DirectoryState, desc="Directory state";
	NetDest Sharers, desc="Sharers for this block";
	NetDest Owner, desc="Owner of this block";
	}

	// TBE entries for DMA requests
	structure(TBE, desc="TBE entries for outstanding DMA requests") {
	Addr PhysicalAddress, desc="physical address";
	State TBEState, desc="Transient State";
	DataBlock DataBlk, desc="Data to be written (DMA write only)";
	int Len, desc="...";
	MachineID DmaRequestor, desc="DMA requestor";
	}

	structure(TBETable, external="yes") {
	TBE lookup(Addr);
	void allocate(Addr);
	void deallocate(Addr);
	bool isPresent(Addr);
	}

	// OBJECTS
	TBETable TBEs, template="<Directory_TBE>", constructor="m_number_of_TBEs";

	Tick clockEdge();
	Cycles ticksToCycles(Tick t);
	Tick cyclesToTicks(Cycles c);
	void set_tbe(TBE b);
	void unset_tbe();

	Entry getDirectoryEntry(Addr addr), return_by_pointer="yes" {
	Entry dir_entry := static_cast(Entry, "pointer", directory[addr]);

	if (is_valid(dir_entry)) {
	return dir_entry;
	}

	dir_entry := static_cast(Entry, "pointer",
	directory.allocate(addr, new Entry));
	return dir_entry;
	}

	State getState(TBE tbe, Addr addr) {
	if (is_valid(tbe)) {
	return tbe.TBEState;
	} else if (directory.isPresent(addr)) {
	return getDirectoryEntry(addr).DirectoryState;
	} else {
	return State:I;
	}
	}

	void setState(TBE tbe, Addr addr, State state) {

	if (is_valid(tbe)) {
	tbe.TBEState := state;
	}

	if (directory.isPresent(addr)) {

	if (state == State:M) {
	assert(getDirectoryEntry(addr).Owner.count() == 1);
	assert(getDirectoryEntry(addr).Sharers.count() == 0);
	}

	getDirectoryEntry(addr).DirectoryState := state;

	if (state == State:I) {
	assert(getDirectoryEntry(addr).Owner.count() == 0);
	assert(getDirectoryEntry(addr).Sharers.count() == 0);
	}
	}
	}

	AccessPermission getAccessPermission(Addr addr) {
	TBE tbe := TBEs[addr];
	if(is_valid(tbe)) {
	return Directory_State_to_permission(tbe.TBEState);
	}

	if(directory.isPresent(addr)) {
	return Directory_State_to_permission(getDirectoryEntry(addr).DirectoryState);
	}

	return AccessPermission:NotPresent;
	}

	void setAccessPermission(Addr addr, State state) {
	if (directory.isPresent(addr)) {
	getDirectoryEntry(addr).changePermission(Directory_State_to_permission(state));
	}
	}

	void functionalRead(Addr addr, Packet *pkt) {
	TBE tbe := TBEs[addr];
	if(is_valid(tbe)) {
	testAndRead(addr, tbe.DataBlk, pkt);
	} else {
	functionalMemoryRead(pkt);
	}
	}

	int functionalWrite(Addr addr, Packet *pkt) {
	int num_functional_writes := 0;

	TBE tbe := TBEs[addr];
	if(is_valid(tbe)) {
	num_functional_writes := num_functional_writes +
	testAndWrite(addr, tbe.DataBlk, pkt);
	}

	num_functional_writes := num_functional_writes + functionalMemoryWrite(pkt);
	return num_functional_writes;
	}

	// OUT_PORTS
	out_port(forwardNetwork_out, RequestMsg, forwardFromDir);
	out_port(responseNetwork_out, ResponseMsg, responseFromDir);
	out_port(requestQueue_out, ResponseMsg, requestToDir); // For recycling requests
	out_port(dmaResponseNetwork_out, DMAResponseMsg, dmaResponseFromDir);

	// IN_PORTS
	in_port(dmaRequestQueue_in, DMARequestMsg, dmaRequestToDir) {
	if (dmaRequestQueue_in.isReady(clockEdge())) {
	peek(dmaRequestQueue_in, DMARequestMsg) {
	TBE tbe := TBEs[in_msg.LineAddress];
	if (in_msg.Type == DMARequestType:READ) {
	trigger(Event:DMA_READ, in_msg.LineAddress, tbe);
	} else if (in_msg.Type == DMARequestType:WRITE) {
	trigger(Event:DMA_WRITE, in_msg.LineAddress, tbe);
	} else {
	error("Invalid message");
	}
	}
	}
	}

	in_port(requestQueue_in, RequestMsg, requestToDir) {
	if (requestQueue_in.isReady(clockEdge())) {
	peek(requestQueue_in, RequestMsg) {
	TBE tbe := TBEs[in_msg.addr];
	if (in_msg.Type == CoherenceRequestType:GETS) {
	trigger(Event:GETS, in_msg.addr, tbe);
	} else if (in_msg.Type == CoherenceRequestType:GETX) {
	trigger(Event:GETX, in_msg.addr, tbe);
	} else if (in_msg.Type == CoherenceRequestType:PUTX) {
	if (getDirectoryEntry(in_msg.addr).Owner.isElement(in_msg.Requestor)) {
	trigger(Event:PUTX, in_msg.addr, tbe);
	} else {
	trigger(Event:PUTX_NotOwner, in_msg.addr, tbe);
	}
	} else {
	error("Invalid message");
	}
	}
	}
	}

	//added by SS
	// off-chip memory request/response is done
	in_port(memQueue_in, MemoryMsg, responseFromMemory) {
	if (memQueue_in.isReady(clockEdge())) {
	peek(memQueue_in, MemoryMsg) {
	TBE tbe := TBEs[in_msg.addr];
	if (in_msg.Type == MemoryRequestType:MEMORY_READ) {
	trigger(Event:Memory_Data, in_msg.addr, tbe);
	} else if (in_msg.Type == MemoryRequestType:MEMORY_WB) {
	trigger(Event:Memory_Ack, in_msg.addr, tbe);
	} else {
	DPRINTF(RubySlicc,"%s\n", in_msg.Type);
	error("Invalid message");
	}
	}
	}
	}

	// Actions

	action(a_sendWriteBackAck, "a", desc="Send writeback ack to requestor") {
	peek(requestQueue_in, RequestMsg) {
	enqueue(forwardNetwork_out, RequestMsg, directory_latency) {
	out_msg.addr := address;
	out_msg.Type := CoherenceRequestType:WB_ACK;
	out_msg.Requestor := in_msg.Requestor;
	out_msg.Destination.add(in_msg.Requestor);
	out_msg.MessageSize := MessageSizeType:Writeback_Control;
	}
	}
	}

	action(l_sendWriteBackAck, "la", desc="Send writeback ack to requestor") {
	peek(memQueue_in, MemoryMsg) {
	enqueue(forwardNetwork_out, RequestMsg, 1) {
	out_msg.addr := address;
	out_msg.Type := CoherenceRequestType:WB_ACK;
	out_msg.Requestor := in_msg.OriginalRequestorMachId;
	out_msg.Destination.add(in_msg.OriginalRequestorMachId);
	out_msg.MessageSize := MessageSizeType:Writeback_Control;
	}
	}
	}

	action(b_sendWriteBackNack, "b", desc="Send writeback nack to requestor") {
	peek(requestQueue_in, RequestMsg) {
	enqueue(forwardNetwork_out, RequestMsg, directory_latency) {
	out_msg.addr := address;
	out_msg.Type := CoherenceRequestType:WB_NACK;
	out_msg.Requestor := in_msg.Requestor;
	out_msg.Destination.add(in_msg.Requestor);
	out_msg.MessageSize := MessageSizeType:Writeback_Control;
	}
	}
	}

	action(c_clearOwner, "c", desc="Clear the owner field") {
	getDirectoryEntry(address).Owner.clear();
	}

	action(d_sendData, "d", desc="Send data to requestor") {
	peek(memQueue_in, MemoryMsg) {
	enqueue(responseNetwork_out, ResponseMsg, 1) {
	out_msg.addr := address;
	out_msg.Type := CoherenceResponseType:DATA;
	out_msg.Sender := machineID;
	out_msg.Destination.add(in_msg.OriginalRequestorMachId);
	out_msg.DataBlk := in_msg.DataBlk;
	out_msg.MessageSize := MessageSizeType:Response_Data;
	}
	}
	}

	action(dr_sendDMAData, "dr", desc="Send Data to DMA controller from directory") {
	peek(memQueue_in, MemoryMsg) {
	enqueue(dmaResponseNetwork_out, DMAResponseMsg, 1) {
	assert(is_valid(tbe));
	out_msg.PhysicalAddress := address;
	out_msg.LineAddress := address;
	out_msg.Type := DMAResponseType:DATA;
	out_msg.DataBlk := in_msg.DataBlk; // we send the entire data block and rely on the dma controller to split it up if need be
	out_msg.Destination.add(tbe.DmaRequestor);
	out_msg.MessageSize := MessageSizeType:Response_Data;
	}
	}
	}



	action(drp_sendDMAData, "drp", desc="Send Data to DMA controller from incoming PUTX") {
	peek(requestQueue_in, RequestMsg) {
	enqueue(dmaResponseNetwork_out, DMAResponseMsg, 1) {
	assert(is_valid(tbe));
	out_msg.PhysicalAddress := address;
	out_msg.LineAddress := address;
	out_msg.Type := DMAResponseType:DATA;

	// we send the entire data block and rely on the dma controller
	// to split it up if need be
	out_msg.DataBlk := in_msg.DataBlk;
	out_msg.Destination.add(tbe.DmaRequestor);
	out_msg.MessageSize := MessageSizeType:Response_Data;
	}
	}
	}

	action(da_sendDMAAck, "da", desc="Send Ack to DMA controller") {
	enqueue(dmaResponseNetwork_out, DMAResponseMsg, 1) {
	assert(is_valid(tbe));
	out_msg.PhysicalAddress := address;
	out_msg.LineAddress := address;
	out_msg.Type := DMAResponseType:ACK;
	out_msg.Destination.add(tbe.DmaRequestor);
	out_msg.MessageSize := MessageSizeType:Writeback_Control;
	}
	}

	action(e_ownerIsRequestor, "e", desc="The owner is now the requestor") {
	peek(requestQueue_in, RequestMsg) {
	getDirectoryEntry(address).Owner.clear();
	getDirectoryEntry(address).Owner.add(in_msg.Requestor);
	}
	}

	action(f_forwardRequest, "f", desc="Forward request to owner") {
	peek(requestQueue_in, RequestMsg) {
	APPEND_TRANSITION_COMMENT("Own: ");
	APPEND_TRANSITION_COMMENT(getDirectoryEntry(in_msg.addr).Owner);
	APPEND_TRANSITION_COMMENT("Req: ");
	APPEND_TRANSITION_COMMENT(in_msg.Requestor);
	enqueue(forwardNetwork_out, RequestMsg, directory_latency) {
	out_msg.addr := address;
	out_msg.Type := in_msg.Type;
	out_msg.Requestor := in_msg.Requestor;
	out_msg.Destination := getDirectoryEntry(in_msg.addr).Owner;
	out_msg.MessageSize := MessageSizeType:Writeback_Control;
	}
	}
	}

	action(inv_sendCacheInvalidate, "inv", desc="Invalidate a cache block") {
	peek(dmaRequestQueue_in, DMARequestMsg) {
	enqueue(forwardNetwork_out, RequestMsg, directory_latency) {
	out_msg.addr := address;
	out_msg.Type := CoherenceRequestType:INV;
	out_msg.Requestor := machineID;
	out_msg.Destination := getDirectoryEntry(in_msg.PhysicalAddress).Owner;
	out_msg.MessageSize := MessageSizeType:Writeback_Control;
	}
	}
	}

	action(i_popIncomingRequestQueue, "i", desc="Pop incoming request queue") {
	requestQueue_in.dequeue(clockEdge());
	}

	action(p_popIncomingDMARequestQueue, "p", desc="Pop incoming DMA queue") {
	dmaRequestQueue_in.dequeue(clockEdge());
	}

	action(v_allocateTBE, "v", desc="Allocate TBE") {
	peek(dmaRequestQueue_in, DMARequestMsg) {
	TBEs.allocate(address);
	set_tbe(TBEs[address]);
	tbe.DataBlk := in_msg.DataBlk;
	tbe.PhysicalAddress := in_msg.PhysicalAddress;
	tbe.Len := in_msg.Len;
	tbe.DmaRequestor := in_msg.Requestor;
	}
	}

	action(r_allocateTbeForDmaRead, "\r", desc="Allocate TBE for DMA Read") {
	peek(dmaRequestQueue_in, DMARequestMsg) {
	TBEs.allocate(address);
	set_tbe(TBEs[address]);
	tbe.DmaRequestor := in_msg.Requestor;
	}
	}

	action(v_allocateTBEFromRequestNet, "\v", desc="Allocate TBE") {
	peek(requestQueue_in, RequestMsg) {
	TBEs.allocate(address);
	set_tbe(TBEs[address]);
	tbe.DataBlk := in_msg.DataBlk;
	}
	}

	action(w_deallocateTBE, "w", desc="Deallocate TBE") {
	TBEs.deallocate(address);
	unset_tbe();
	}

	action(z_recycleRequestQueue, "z", desc="recycle request queue") {
	requestQueue_in.recycle(clockEdge(), cyclesToTicks(recycle_latency));
	}

	action(y_recycleDMARequestQueue, "y", desc="recycle dma request queue") {
	dmaRequestQueue_in.recycle(clockEdge(), cyclesToTicks(recycle_latency));
	}


	action(qf_queueMemoryFetchRequest, "qf", desc="Queue off-chip fetch request") {
	peek(requestQueue_in, RequestMsg) {
	queueMemoryRead(in_msg.Requestor, address, to_memory_controller_latency);
	}
	}

	action(qf_queueMemoryFetchRequestDMA, "qfd", desc="Queue off-chip fetch request") {
	peek(dmaRequestQueue_in, DMARequestMsg) {
	queueMemoryRead(in_msg.Requestor, address, to_memory_controller_latency);
	}
	}

	action(qw_queueMemoryWBRequest_partial, "qwp", desc="Queue off-chip writeback request") {
	peek(dmaRequestQueue_in, DMARequestMsg) {
	queueMemoryWritePartial(in_msg.Requestor, address,
	to_memory_controller_latency, in_msg.DataBlk,
	in_msg.Len);
	}
	}

	action(qw_queueMemoryWBRequest_partialTBE, "qwt", desc="Queue off-chip writeback request") {
	peek(requestQueue_in, RequestMsg) {
	queueMemoryWritePartial(in_msg.Requestor, address,
	to_memory_controller_latency, tbe.DataBlk,
	tbe.Len);
	}
	}

	action(l_queueMemoryWBRequest, "lq", desc="Write PUTX data to memory") {
	peek(requestQueue_in, RequestMsg) {
	queueMemoryWrite(in_msg.Requestor, address, to_memory_controller_latency,
	in_msg.DataBlk);
	}
	}

	action(l_popMemQueue, "q", desc="Pop off-chip request queue") {
	memQueue_in.dequeue(clockEdge());
	}

	// TRANSITIONS
	transition({M_DRD, M_DWR, M_DWRI, M_DRDI}, GETX) {
	z_recycleRequestQueue;
	}

	transition({IM, MI, ID, ID_W}, {GETX, GETS, PUTX, PUTX_NotOwner} ) {
	z_recycleRequestQueue;
	}

	transition({IM, MI, ID, ID_W}, {DMA_READ, DMA_WRITE} ) {
	y_recycleDMARequestQueue;
	}


	transition(I, GETX, IM) {
	//d_sendData;
	v_allocateTBEFromRequestNet;
	qf_queueMemoryFetchRequest;
	e_ownerIsRequestor;
	i_popIncomingRequestQueue;
	}

	transition(IM, Memory_Data, M) {
	d_sendData;
	//e_ownerIsRequestor;
	w_deallocateTBE;
	l_popMemQueue;
	}


	transition(I, DMA_READ, ID) {
	//dr_sendDMAData;
	r_allocateTbeForDmaRead;
	qf_queueMemoryFetchRequestDMA;
	p_popIncomingDMARequestQueue;
	}

	transition(ID, Memory_Data, I) {
	dr_sendDMAData;
	//p_popIncomingDMARequestQueue;
	w_deallocateTBE;
	l_popMemQueue;
	}



	transition(I, DMA_WRITE, ID_W) {
	v_allocateTBE;
	qw_queueMemoryWBRequest_partial;
	p_popIncomingDMARequestQueue;
	}

	transition(ID_W, Memory_Ack, I) {
	da_sendDMAAck;
	w_deallocateTBE;
	l_popMemQueue;
	}

	transition(M, DMA_READ, M_DRD) {
	v_allocateTBE;
	inv_sendCacheInvalidate;
	p_popIncomingDMARequestQueue;
	}

	transition(M_DRD, PUTX, M_DRDI) {
	drp_sendDMAData;
	c_clearOwner;
	l_queueMemoryWBRequest;
	i_popIncomingRequestQueue;
	}

	transition(M_DRDI, Memory_Ack, I) {
	l_sendWriteBackAck;
	w_deallocateTBE;
	l_popMemQueue;
	}


	transition(M, DMA_WRITE, M_DWR) {
	v_allocateTBE;
	inv_sendCacheInvalidate;
	p_popIncomingDMARequestQueue;
	}

	transition(M_DWR, PUTX, M_DWRI) {
	qw_queueMemoryWBRequest_partialTBE;
	c_clearOwner;
	i_popIncomingRequestQueue;
	}

	transition(M_DWRI, Memory_Ack, I) {
	l_sendWriteBackAck;
	da_sendDMAAck;
	w_deallocateTBE;
	l_popMemQueue;
	}

	transition(M, GETX, M) {
	f_forwardRequest;
	e_ownerIsRequestor;
	i_popIncomingRequestQueue;
	}

	transition(M, PUTX, MI) {
	c_clearOwner;
	v_allocateTBEFromRequestNet;
	l_queueMemoryWBRequest;
	i_popIncomingRequestQueue;
	}

	transition(MI, Memory_Ack, I) {
	l_sendWriteBackAck;
	w_deallocateTBE;
	l_popMemQueue;
	}

	transition(M, PUTX_NotOwner, M) {
	b_sendWriteBackNack;
	i_popIncomingRequestQueue;
	}

	transition(I, PUTX_NotOwner, I) {
	b_sendWriteBackNack;
	i_popIncomingRequestQueue;
	}
	}