speaker.hh

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/*
 * Copyright (c) 2008 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,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 */
 
#ifndef __DEV_X86_SPEAKER_HH__
#define __DEV_X86_SPEAKER_HH__
 
#include "base/bitunion.hh"
#include "dev/io_device.hh"
#include "params/PcSpeaker.hh"
 
namespace X86ISA
{
 
class I8254;
 
class Speaker : public BasicPioDevice
{
  protected:
    Tick latency;
 
    BitUnion8(SpeakerControl)
        Bitfield<0> gate;
        Bitfield<1> speaker;
        Bitfield<5> timer;
    EndBitUnion(SpeakerControl)
 
    SpeakerControl controlVal;
 
    I8254 * timer;
 
  public:
    typedef PcSpeakerParams Params;
 
    const Params *
    params() const
    {
        return dynamic_cast<const Params *>(_params);
    }
 
    Speaker(Params *p) : BasicPioDevice(p, 1),
        latency(p->pio_latency), controlVal(0), timer(p->i8254)
    {
    }
 
    Tick read(PacketPtr pkt) override;
 
    Tick write(PacketPtr pkt) override;
 
    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;
};
 
} // namespace X86ISA
 
#endif //__DEV_X86_SPEAKER_HH__