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// ----------------------------------------------------------------------------

// Remote Serial Protocol connection: definition

// Copyright (C) 2008  Embecosm Limited <info@embecosm.com>

// Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

// This file is part of the cycle accurate model of the OpenRISC 1000 based

// system-on-chip, ORPSoC, built using Verilator.

// This program is free software: you can redistribute it and/or modify it

// under the terms of the GNU Lesser General Public License as published by

// the Free Software Foundation, either version 3 of the License, or (at your

// option) any later version.

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public

// License for more details.

// You should have received a copy of the GNU Lesser General Public License

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// ----------------------------------------------------------------------------

// $Id: RspConnection.h 326 2009-03-07 16:47:31Z jeremy $

#ifndef RSP_CONNECTION__H

#define RSP_CONNECTION__H

#include "RspPacket.h"

//! The default service to use if port number = 0 and no service specified

#define DEFAULT_RSP_SERVICE  "or1ksim-rsp"

//-----------------------------------------------------------------------------

//! Class implementing the RSP connection listener

//! RSP requests received from TCP/IP are queued on the output FIFO for

//! processing by the GDB server. Packets read from the input FIFO from the

//! GDB server are sent back via TCP/IP.

//! The packets are received serially, ie. a new packet is not sent until the

//! previous ones have been dealt with. Some packets need no reply, so they

//! will be sent one after the other. But for packets that need a reply (which

//! may be one or several packets), new packets are not sent until the reply

//! from the previous one is received.

//! The upshot of this is that we can avoid any risk of deadlock by always

//! giving priority to any outgoing reply packets.

//! Two threads are used, one to listen for TCP/IP connections from the

//! client, the other to look for FIFO packets from the GDB server to write

//! back to the client. Both must be non-blocking in the SystemC sense

//! (i.e. allow other SystemC threads to run).

//-----------------------------------------------------------------------------

class RspConnection

{

public:

  // Constructors and destructor

  RspConnection (int         _portNum);

  RspConnection (const char *_serviceName = DEFAULT_RSP_SERVICE);

  ~RspConnection ();

  // Public interface: manage client connections

  bool  rspConnect ();

  void  rspClose ();

  bool  isConnected ();

  char  rspSocketPeek ();

  // Public interface: get packets from the stream and put them out

  bool  getPkt (RspPacket *pkt);

  bool  putPkt (RspPacket *pkt);

  int   getRspChar ();

private:

  // Generic initializer

  void  rspInit (int         _portNum,

                 const char *_serviceName);

  // Internal routines to handle individual chars  

  bool  putRspChar (char  c);

  //int   getRspChar ();

  //! The port number to listen on

  int  portNum;

  //! The service name to listen on

  const char *serviceName;

  //! The client file descriptor

  int  clientFd;

};      // RspConnection ()

#endif  // RSP_CONNECTION__H