mem_delay.hh

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#ifndef __MEM_MEM_DELAY_HH__
#define __MEM_MEM_DELAY_HH__
 
#include "mem/qport.hh"
#include "sim/clocked_object.hh"
 
namespace gem5
{
 
struct MemDelayParams;
struct SimpleMemDelayParams;

class MemDelay : public ClockedObject
{
 
  public:
    MemDelay(const MemDelayParams &params);
 
    void init() override;
 
  protected: // Port interface
    Port &getPort(const std::string &if_name,
                  PortID idx=InvalidPortID) override;
 
    class RequestPort : public QueuedRequestPort
    {
      public:
        RequestPort(const std::string &_name, MemDelay &_parent);
 
      protected:
        bool recvTimingResp(PacketPtr pkt) override;
 
        void recvFunctionalSnoop(PacketPtr pkt) override;
 
        Tick recvAtomicSnoop(PacketPtr pkt) override;
 
        void recvTimingSnoopReq(PacketPtr pkt) override;
 
        void recvRangeChange() override {
            parent.responsePort.sendRangeChange();
        }
 
        bool isSnooping() const override {
            return parent.responsePort.isSnooping();
        }
 
      private:
        MemDelay& parent;
    };
 
    class ResponsePort : public QueuedResponsePort
    {
      public:
        ResponsePort(const std::string &_name, MemDelay &_parent);
 
      protected:
        Tick recvAtomic(PacketPtr pkt) override;
        bool recvTimingReq(PacketPtr pkt) override;
        void recvFunctional(PacketPtr pkt) override;
        bool recvTimingSnoopResp(PacketPtr pkt) override;
 
        AddrRangeList getAddrRanges() const override {
            return parent.requestPort.getAddrRanges();
        }
 
        bool tryTiming(PacketPtr pkt) override { return true; }
 
      private:
 
        MemDelay& parent;
 
    };
 
    bool trySatisfyFunctional(PacketPtr pkt);
 
    RequestPort requestPort;
    ResponsePort responsePort;
 
    ReqPacketQueue reqQueue;
    RespPacketQueue respQueue;
    SnoopRespPacketQueue snoopRespQueue;
 
  protected:
    virtual Tick delayReq(PacketPtr pkt) { return 0; }

    virtual Tick delayResp(PacketPtr pkt) { return 0; }

    virtual Tick delaySnoopResp(PacketPtr pkt) { return 0; }
};

class SimpleMemDelay : public MemDelay
{
  public:
    SimpleMemDelay(const SimpleMemDelayParams &params);
 
  protected:
    Tick delayReq(PacketPtr pkt) override;
    Tick delayResp(PacketPtr pkt) override;
 
  protected: // Params
    const Tick readReqDelay;
    const Tick readRespDelay;
 
    const Tick writeReqDelay;
    const Tick writeRespDelay;
};
 
} // namespace gem5
 
#endif //__MEM_MEM_DELAY_HH__