mem_delay.hh

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 * Authors: Andreas Sandberg
 */

#ifndef __MEM_MEM_DELAY_HH__
#define __MEM_MEM_DELAY_HH__

#include "mem/qport.hh"
#include "sim/clocked_object.hh"

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 MasterPort : public QueuedMasterPort
    {
      public:
        MasterPort(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.slavePort.sendRangeChange();
        }

        bool isSnooping() const override {
            return parent.slavePort.isSnooping();
        }

      private:
        MemDelay& parent;
    };

    class SlavePort : public QueuedSlavePort
    {
      public:
        SlavePort(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.masterPort.getAddrRanges();
        }

        bool tryTiming(PacketPtr pkt) override { return true; }

      private:

        MemDelay& parent;

    };

    bool trySatisfyFunctional(PacketPtr pkt);

    MasterPort masterPort;
    SlavePort slavePort;

    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;
};

#endif //__MEM_MEM_DELAY_HH__