/*****************************************************************************

  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2008 by all Contributors.
  All Rights reserved.

  The contents of this file are subject to the restrictions and limitations
  set forth in the SystemC Open Source License Version 3.0 (the "License");
  You may not use this file except in compliance with such restrictions and
  limitations. You may obtain instructions on how to receive a copy of the
  License at http://www.systemc.org/. Software distributed by Contributors
  under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
  ANY KIND, either express or implied. See the License for the specific
  language governing rights and limitations under the License.

 *****************************************************************************/

#ifndef __SIMPLE_LT_TARGET1_H__
#define __SIMPLE_LT_TARGET1_H__

#include "tlm.h"
#include <cassert>
#include <vector>

class SimpleLTTarget1 :
  public sc_core::sc_module,
  public virtual tlm::tlm_fw_transport_if<>
{
public:
  typedef tlm::tlm_generic_payload      transaction_type;
  typedef tlm::tlm_phase                phase_type;
  typedef tlm::tlm_sync_enum            sync_enum_type;
  typedef tlm::tlm_fw_transport_if<>    fw_interface_type;
  typedef tlm::tlm_bw_transport_if<>    bw_interface_type;
  typedef tlm::tlm_target_socket<32>    target_socket_type;

public:
  target_socket_type socket;

public:
  SC_HAS_PROCESS(SimpleLTTarget1);
  SimpleLTTarget1(sc_core::sc_module_name name, bool invalidate = false) :
      sc_core::sc_module(name),
      socket("socket"),
      m_invalidate(invalidate)
  {
    // Bind this target's interface to the target socket
    socket(*this);
    if (invalidate)
    {
        SC_METHOD(invalidate_dmi_method);
        sensitive << m_invalidate_dmi_event;
        dont_initialize();
        m_invalidate_dmi_time = sc_core::sc_time(25, sc_core::SC_NS);
    }
  }

  sync_enum_type nb_transport_fw(transaction_type& trans, phase_type& phase, sc_core::sc_time& t)
  {
    //Target never calls wait, so we can do this
    b_transport(trans, t);

    return tlm::TLM_COMPLETED;
  }

  void b_transport(transaction_type& trans, sc_core::sc_time &t)
  {
    sc_dt::uint64 address = trans.get_address();
    assert(address < 400);

    unsigned int& data = *reinterpret_cast<unsigned int*>(trans.get_data_ptr());
    if (trans.get_command() == tlm::TLM_WRITE_COMMAND) {
      std::cout << name() << ": Received write request: A = 0x"
                << std::hex << (unsigned int)address
                << ", D = 0x" << data << std::dec
                << " @ " << sc_core::sc_time_stamp() << std::endl;

      *reinterpret_cast<unsigned int*>(&mMem[address]) = data;
      t+=  sc_core::sc_time(10, sc_core::SC_NS);

    } else {
      std::cout << name() << ": Received read request: A = 0x"
                << std::hex << (unsigned int)address << std::dec
                << " @ " << sc_core::sc_time_stamp() << std::endl;

      data = *reinterpret_cast<unsigned int*>(&mMem[address]);
      t += sc_core::sc_time(100, sc_core::SC_NS);
    }

    trans.set_response_status(tlm::TLM_OK_RESPONSE);

    trans.set_dmi_allowed(true);
  }

  unsigned int transport_dbg(transaction_type& r)
  {
    if (r.get_address() >= 400) return 0;

    unsigned int tmp = (int)r.get_address();
    unsigned int num_bytes;
    if (tmp + r.get_data_length() >= 400) {
      num_bytes = 400 - tmp;

    } else {
      num_bytes = r.get_data_length();
    }
    if (r.is_read()) {
      for (unsigned int i = 0; i < num_bytes; ++i) {
        r.get_data_ptr()[i] = mMem[i + tmp];
      }

    } else {
      for (unsigned int i = 0; i < num_bytes; ++i) {
        mMem[i + tmp] = r.get_data_ptr()[i];
      }
    }
    return num_bytes;
  }

  bool get_direct_mem_ptr(transaction_type& trans,
                          tlm::tlm_dmi&  dmi_data)
  {
    sc_dt::uint64 address = trans.get_address();
    if (m_invalidate) m_invalidate_dmi_event.notify(m_invalidate_dmi_time);
    if (address < 400) {
      dmi_data.allow_read_write();
      dmi_data.set_start_address(0x0);
      dmi_data.set_end_address(399);
      dmi_data.set_dmi_ptr(mMem);
      dmi_data.set_read_latency(sc_core::sc_time(100, sc_core::SC_NS));
      dmi_data.set_write_latency(sc_core::sc_time(10, sc_core::SC_NS));
      return true;

    } else {
      // should not happen
      dmi_data.set_start_address(trans.get_address());
      dmi_data.set_end_address(trans.get_address());
      return false;

    }
  }

  void invalidate_dmi_method()
  {
      sc_dt::uint64 start_address = 0x0;
      sc_dt::uint64 end_address = 399;
      socket->invalidate_direct_mem_ptr(start_address, end_address);
  }
private:
  unsigned char mMem[400];
  bool              m_invalidate;
  sc_core::sc_event m_invalidate_dmi_event;
  sc_core::sc_time  m_invalidate_dmi_time;
};

#endif
