gem5_to_tlm.hh

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 * Copyright (c) 2016, Dresden University of Technology (TU Dresden)
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. 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.
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 * 3. Neither the name of the copyright holder 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 HOLDER
 * 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
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef __SYSTEMC_TLM_BRIDGE_GEM5_TO_TLM_HH__
#define __SYSTEMC_TLM_BRIDGE_GEM5_TO_TLM_HH__
 
#include <functional>
#include <string>
#include <unordered_map>
 
#include "mem/backdoor.hh"
#include "mem/port.hh"
#include "params/Gem5ToTlmBridgeBase.hh"
#include "sim/system.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/simple_initiator_socket.h"
#include "systemc/tlm_port_wrapper.hh"
 
namespace sc_gem5
{
 
using PacketToPayloadConversionStep =
    std::function<void(gem5::PacketPtr pkt, tlm::tlm_generic_payload &trans)>;
 
void addPacketToPayloadConversionStep(PacketToPayloadConversionStep step);
 
tlm::tlm_generic_payload *packet2payload(gem5::PacketPtr packet);
 
class Gem5ToTlmBridgeBase : public sc_core::sc_module
{
  protected:
    using sc_core::sc_module::sc_module;
};
 
template <unsigned int BITWIDTH>
class Gem5ToTlmBridge : public Gem5ToTlmBridgeBase
{
  private:
    class BridgeResponsePort : public gem5::ResponsePort
    {
      protected:
        Gem5ToTlmBridge<BITWIDTH> &bridge;
 
        gem5::AddrRangeList
        getAddrRanges() const override
        {
            return bridge.getAddrRanges();
        }
        gem5::Tick
        recvAtomic(gem5::PacketPtr pkt) override
        {
            return bridge.recvAtomic(pkt);
        }
        gem5::Tick
        recvAtomicBackdoor(gem5::PacketPtr pkt,
            gem5::MemBackdoorPtr &backdoor) override
        {
            return bridge.recvAtomicBackdoor(pkt, backdoor);
        }
        void
        recvFunctional(gem5::PacketPtr pkt) override
        {
            return bridge.recvFunctional(pkt);
        }
        void
        recvMemBackdoorReq(const gem5::MemBackdoorReq &req,
                gem5::MemBackdoorPtr &backdoor) override
        {
            bridge.recvMemBackdoorReq(req, backdoor);
        }
        bool
        recvTimingReq(gem5::PacketPtr pkt) override
        {
            return bridge.recvTimingReq(pkt);
        }
        bool
        tryTiming(gem5::PacketPtr pkt) override
        {
            return bridge.tryTiming(pkt);
        }
        bool
        recvTimingSnoopResp(gem5::PacketPtr pkt) override
        {
            return bridge.recvTimingSnoopResp(pkt);
        }
        void recvRespRetry() override { bridge.recvRespRetry(); }
 
      public:
        BridgeResponsePort(const std::string &name_,
                        Gem5ToTlmBridge<BITWIDTH> &bridge_) :
            ResponsePort(name_), bridge(bridge_)
        {}
    };
 
    BridgeResponsePort bridgeResponsePort;
    tlm_utils::simple_initiator_socket<
        Gem5ToTlmBridge<BITWIDTH>, BITWIDTH> socket;
    sc_gem5::TlmInitiatorWrapper<BITWIDTH> wrapper;
 
    gem5::System *system;
 
    tlm::tlm_generic_payload *blockingRequest;
 
    bool needToSendRequestRetry;
 
    tlm::tlm_generic_payload *blockingResponse;
 
    std::unordered_map<tlm::tlm_generic_payload *, gem5::PacketPtr> packetMap;
 
    gem5::AddrRangeList addrRanges;
 
  protected:
    void pec(tlm::tlm_generic_payload &trans, const tlm::tlm_phase &phase);
 
    gem5::MemBackdoorPtr getBackdoor(tlm::tlm_generic_payload &trans);
    gem5::AddrRangeMap<gem5::MemBackdoorPtr> backdoorMap;
 
    // The gem5 port interface.
    gem5::Tick recvAtomic(gem5::PacketPtr packet);
    gem5::Tick recvAtomicBackdoor(gem5::PacketPtr pkt,
        gem5::MemBackdoorPtr &backdoor);
    void recvFunctional(gem5::PacketPtr packet);
    void recvMemBackdoorReq(const gem5::MemBackdoorReq &req,
            gem5::MemBackdoorPtr &backdoor);
    bool recvTimingReq(gem5::PacketPtr packet);
    bool tryTiming(gem5::PacketPtr packet);
    bool recvTimingSnoopResp(gem5::PacketPtr packet);
    void recvRespRetry();
    void recvFunctionalSnoop(gem5::PacketPtr packet);
    gem5::AddrRangeList getAddrRanges() const { return addrRanges; }
 
    // The TLM initiator interface.
    tlm::tlm_sync_enum nb_transport_bw(tlm::tlm_generic_payload &trans,
                                       tlm::tlm_phase &phase,
                                       sc_core::sc_time &t);
    void invalidate_direct_mem_ptr(
            sc_dt::uint64 start_range, sc_dt::uint64 end_range);
 
  public:
    gem5::Port &gem5_getPort(const std::string &if_name, int idx=-1) override;
 
    typedef gem5::Gem5ToTlmBridgeBaseParams Params;
    Gem5ToTlmBridge(const Params &p, const sc_core::sc_module_name &mn);
 
    tlm_utils::simple_initiator_socket<Gem5ToTlmBridge<BITWIDTH>, BITWIDTH> &
    getSocket()
    {
        return socket;
    }
 
    void before_end_of_elaboration() override;
};
 
} // namespace sc_gem5
 
#endif // __SYSTEMC_TLM_BRIDGE_GEM5_TO_TLM_HH__