tlm_to_gem5.hh

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 *    this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    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
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#ifndef __SYSTEMC_TLM_BRIDGE_TLM_TO_GEM5_HH__
#define __SYSTEMC_TLM_BRIDGE_TLM_TO_GEM5_HH__
 
#include <functional>
#include <unordered_set>
#include <utility>
 
#include "mem/port.hh"
#include "params/TlmToGem5BridgeBase.hh"
#include "systemc/ext/core/sc_module.hh"
#include "systemc/ext/core/sc_module_name.hh"
#include "systemc/ext/tlm_core/2/generic_payload/gp.hh"
#include "systemc/ext/tlm_utils/peq_with_cb_and_phase.h"
#include "systemc/ext/tlm_utils/simple_target_socket.h"
#include "systemc/tlm_bridge/sc_ext.hh"
#include "systemc/tlm_port_wrapper.hh"
 
namespace sc_gem5
{
 
using PayloadToPacketConversionStep =
    std::function<void(gem5::PacketPtr pkt, tlm::tlm_generic_payload &trans)>;
 
void addPayloadToPacketConversionStep(PayloadToPacketConversionStep step);
 
std::pair<gem5::PacketPtr, bool> payload2packet(gem5::RequestorID _id,
    tlm::tlm_generic_payload &trans);
 
class TlmToGem5BridgeBase : public sc_core::sc_module
{
  protected:
    using sc_core::sc_module::sc_module;
};
 
template <unsigned int BITWIDTH>
class TlmToGem5Bridge : public TlmToGem5BridgeBase
{
  private:
    class BridgeRequestPort : public gem5::RequestPort
    {
      protected:
        TlmToGem5Bridge<BITWIDTH> &bridge;
 
        bool
        recvTimingResp(gem5::PacketPtr pkt) override
        {
            return bridge.recvTimingResp(pkt);
        }
        void recvReqRetry() override { bridge.recvReqRetry(); }
        void recvRangeChange() override { bridge.recvRangeChange(); }
 
      public:
        BridgeRequestPort(const std::string &name_,
                         TlmToGem5Bridge<BITWIDTH> &bridge_) :
            RequestPort(name_), bridge(bridge_)
        {}
    };
 
    tlm_utils::peq_with_cb_and_phase<TlmToGem5Bridge<BITWIDTH>> peq;
 
    bool waitForRetry;
    tlm::tlm_generic_payload *pendingRequest;
    gem5::PacketPtr pendingPacket;
 
    bool needToSendRetry;
 
    bool responseInProgress;
 
    std::unordered_set<gem5::MemBackdoorPtr> requestedBackdoors;
 
    BridgeRequestPort bmp;
    tlm_utils::simple_target_socket<
        TlmToGem5Bridge<BITWIDTH>, BITWIDTH> socket;
    sc_gem5::TlmTargetWrapper<BITWIDTH> wrapper;
 
    gem5::System *system;
 
    void sendEndReq(tlm::tlm_generic_payload &trans);
    void sendBeginResp(tlm::tlm_generic_payload &trans,
                       sc_core::sc_time &delay);
 
    void handleBeginReq(tlm::tlm_generic_payload &trans);
    void handleEndResp(tlm::tlm_generic_payload &trans);
 
    void destroyPacket(gem5::PacketPtr pkt);
 
    void invalidateDmi(const gem5::MemBackdoor &backdoor);
 
    void cacheBackdoor(gem5::MemBackdoorPtr backdoor);
 
  protected:
    // payload event call back
    void peq_cb(tlm::tlm_generic_payload &trans, const tlm::tlm_phase &phase);
 
    // The TLM target interface
    tlm::tlm_sync_enum nb_transport_fw(tlm::tlm_generic_payload &trans,
                                       tlm::tlm_phase &phase,
                                       sc_core::sc_time &t);
    void b_transport(tlm::tlm_generic_payload &trans, sc_core::sc_time &t);
    unsigned int transport_dbg(tlm::tlm_generic_payload &trans);
    bool get_direct_mem_ptr(tlm::tlm_generic_payload &trans,
                            tlm::tlm_dmi &dmi_data);
 
    // Gem5 port interface.
    bool recvTimingResp(gem5::PacketPtr pkt);
    void recvReqRetry();
    void recvRangeChange();
 
  public:
    gem5::Port &gem5_getPort(const std::string &if_name, int idx=-1) override;
 
    typedef gem5::TlmToGem5BridgeBaseParams Params;
    TlmToGem5Bridge(const Params &p, const sc_core::sc_module_name &mn);
 
    tlm_utils::simple_target_socket<TlmToGem5Bridge<BITWIDTH>, BITWIDTH> &
    getSocket()
    {
        return socket;
    }
 
    void before_end_of_elaboration() override;
 
    const gem5::RequestorID _id;
};
 
} // namespace sc_gem5
 
#endif // __SYSTEMC_TLM_BRIDGE_TLM_TO_GEM5_HH__