malta_io.hh

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/*
 * Copyright (c) 2004-2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * 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
 * "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
 * OWNER 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 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Ali Saidi
 *          Andrew Schultz
 *          Miguel Serrano
 */

#ifndef __DEV_MALTA_IO_HH__
#define __DEV_MALTA_IO_HH__

#include "dev/mips/malta.hh"
#include "dev/mips/malta_cchip.hh"
#include "dev/intel_8254_timer.hh"
#include "dev/io_device.hh"
#include "dev/mc146818.hh"
#include "params/MaltaIO.hh"
#include "sim/eventq.hh"

class MaltaIO : public BasicPioDevice
{
  protected:

    class RTC : public MC146818
    {
      public:
        Malta *malta;
        RTC(const std::string &name, const MaltaIOParams *p);

      protected:
        void handleEvent()
        {
            //Actually interrupt the processor here
            malta->cchip->postRTC();
        }
    };

    uint8_t mask1;

    uint8_t mask2;

    uint8_t mode1;

    uint8_t mode2;

    uint8_t picr; //Raw PIC interrput register

    bool picInterrupting;

    Malta *malta;

    Intel8254Timer pitimer;

    RTC rtc;

    uint16_t timerData;

  public:
    Tick frequency() const;

    typedef MaltaIOParams Params;

    const Params *
    params() const
    {
        return dynamic_cast<const Params *>(_params);
    }

    MaltaIO(const Params *p);

    Tick read(PacketPtr pkt) override;
    Tick write(PacketPtr pkt) override;


    void postIntr(uint8_t interrupt);

    void clearIntr(uint8_t interrupt);

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

    void startup() override;

};

#endif // __DEV_MALTA_IO_HH__