device.hh

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/*
 * Copyright (c) 2017-2018 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
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 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2008 The Regents of The University of Michigan
 * All rights reserved.
 *
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 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * 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;
 * neither the name of the copyright holders 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
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * Authors: Gabe Black
 *          Andreas Sandberg
 */

#ifndef __DEV_PS2_DEVICE_HH__
#define __DEV_PS2_DEVICE_HH__

#include <deque>
#include <vector>

#include "sim/sim_object.hh"

struct PS2DeviceParams;

class PS2Device : public SimObject
{
  public:
    PS2Device(const PS2DeviceParams *p);

    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;

  public: /* Host interface */
    void hostRegDataAvailable(const std::function<void()> &c);

    bool hostDataAvailable() const  { return !outBuffer.empty(); }

    uint8_t hostRead();

    void hostWrite(uint8_t c);

  protected: /* Device interface */
    virtual bool recv(const std::vector<uint8_t> &data) = 0;

    void send(const uint8_t *data, size_t size);
    void send(const std::vector<uint8_t> &data) {
        send(data.data(), data.size());
    }

    void send(uint8_t data) { send(&data, 1); }

    void sendAck();

    size_t sendPending() const { return outBuffer.size(); }

  private:
    std::deque<uint8_t> outBuffer;

    std::vector<uint8_t> inBuffer;

    std::function<void()> dataAvailableCallback;
};

#endif // __DEV_PS2_HOUSE_HH__