Merge zizzer.eecs.umich.edu:/bk/newmem/

[gem5.git] / src / mem / bus.hh

diff --git a/src/mem/bus.hh b/src/mem/bus.hh
index 4f330230f5a995678ebca30fe30054c8d96883a5..ff1d2545d7be9aa5ebbade4c573872d34ba9dff9 100644 (file)
--- a/src/mem/bus.hh
+++ b/src/mem/bus.hh
@@ -59,7 +59,9 @@ class Bus : public MemObject
     /** the next tick at which the bus will be idle */
     Tick tickNextIdle;
 
-    static const int defaultId = -1;
+    Event * drainEvent;
+
+    static const int defaultId = -3; //Make it unique from Broadcast
 
     struct DevMap {
         int portId;
@@ -71,15 +73,15 @@ class Bus : public MemObject
 
     /** Function called by the port when the bus is recieving a Timing
       transaction.*/
-    bool recvTiming(Packet *pkt);
+    bool recvTiming(PacketPtr pkt);
 
     /** Function called by the port when the bus is recieving a Atomic
       transaction.*/
-    Tick recvAtomic(Packet *pkt);
+    Tick recvAtomic(PacketPtr pkt);
 
     /** Function called by the port when the bus is recieving a Functional
         transaction.*/
-    void recvFunctional(Packet *pkt);
+    void recvFunctional(PacketPtr pkt);
 
     /** Timing function called by port when it is once again able to process
      * requests. */
@@ -107,16 +109,16 @@ class Bus : public MemObject
     std::vector<int> findSnoopPorts(Addr addr, int id);
 
     /** Snoop all relevant ports atomicly. */
-    void atomicSnoop(Packet *pkt);
+    Tick atomicSnoop(PacketPtr pkt);
 
     /** Snoop all relevant ports functionally. */
-    void functionalSnoop(Packet *pkt);
+    void functionalSnoop(PacketPtr pkt);
 
     /** Call snoop on caches, be sure to set SNOOP_COMMIT bit if you want
      * the snoop to happen
      * @return True if succeds.
      */
-    bool timingSnoop(Packet *pkt);
+    bool timingSnoop(PacketPtr pkt);
 
     /** Process address range request.
      * @param resp addresses that we can respond to
@@ -125,6 +127,8 @@ class Bus : public MemObject
      */
     void addressRanges(AddrRangeList &resp, AddrRangeList &snoop, int id);
 
+    /** Occupy the bus with transmitting the packet pkt */
+    void occupyBus(PacketPtr pkt);
 
     /** Declaration of the buses port type, one will be instantiated for each
         of the interfaces connecting to the bus. */
@@ -142,7 +146,7 @@ class Bus : public MemObject
 
         /** Constructor for the BusPort.*/
         BusPort(const std::string &_name, Bus *_bus, int _id)
-            : Port(_name), _onRetryList(false), bus(_bus), id(_id)
+            : Port(_name, _bus), _onRetryList(false), bus(_bus), id(_id)
         { }
 
         bool onRetryList()
@@ -155,17 +159,17 @@ class Bus : public MemObject
 
         /** When reciving a timing request from the peer port (at id),
             pass it to the bus. */
-        virtual bool recvTiming(Packet *pkt)
+        virtual bool recvTiming(PacketPtr pkt)
         { pkt->setSrc(id); return bus->recvTiming(pkt); }
 
         /** When reciving a Atomic requestfrom the peer port (at id),
             pass it to the bus. */
-        virtual Tick recvAtomic(Packet *pkt)
+        virtual Tick recvAtomic(PacketPtr pkt)
         { pkt->setSrc(id); return bus->recvAtomic(pkt); }
 
         /** When reciving a Functional requestfrom the peer port (at id),
             pass it to the bus. */
-        virtual void recvFunctional(Packet *pkt)
+        virtual void recvFunctional(PacketPtr pkt)
         { pkt->setSrc(id); bus->recvFunctional(pkt); }
 
         /** When reciving a status changefrom the peer port (at id),
@@ -222,18 +226,24 @@ class Bus : public MemObject
             port->onRetryList(true);
             retryList.push_back(port);
         } else {
-            // The device was retrying a packet. It didn't work, so we'll leave
-            // it at the head of the retry list.
-            inRetry = false;
-
-/*         // We shouldn't be receiving a packet from one port when a different
-            // one is retrying.
-            assert(port == retryingPort);*/
+            if (port->onRetryList()) {
+                // The device was retrying a packet. It didn't work, so we'll leave
+                // it at the head of the retry list.
+                assert(port == retryList.front());
+                inRetry = false;
+            }
+            else {
+                port->onRetryList(true);
+                retryList.push_back(port);
+            }
         }
     }
 
     /** Port that handles requests that don't match any of the interfaces.*/
-    Port *defaultPort;
+    BusPort *defaultPort;
+
+    /** Has the user specified their own default responder? */
+    bool responderSet;
 
   public:
 
@@ -242,9 +252,13 @@ class Bus : public MemObject
 
     virtual void init();
 
-    Bus(const std::string &n, int bus_id, int _clock, int _width)
+    unsigned int drain(Event *de);
+
+    Bus(const std::string &n, int bus_id, int _clock, int _width,
+        bool responder_set)
         : MemObject(n), busId(bus_id), clock(_clock), width(_width),
-        tickNextIdle(0), busIdle(this), inRetry(false), defaultPort(NULL)
+          tickNextIdle(0), drainEvent(NULL), busIdle(this), inRetry(false),
+          defaultPort(NULL), responderSet(responder_set)
     {
         //Both the width and clock period must be positive
         if (width <= 0)