Decrementer.h

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef KERNEL_MACHINE_PPC_COMMON_DECREMENTER_H
#define KERNEL_MACHINE_PPC_COMMON_DECREMENTER_H

#include "pedigree/kernel/machine/SchedulerTimer.h"
#include "pedigree/kernel/processor/InterruptHandler.h"
#include "pedigree/kernel/processor/state.h"

#define DECREMENTER_PERIOD 100

class Decrementer : public SchedulerTimer, private InterruptHandler
{
  public:
    //
    // SchedulerTimer interface
    //
    virtual bool registerHandler(TimerHandler *handler);

    bool initialise() INITIALISATION_ONLY;
    void uninitialise();

    Decrementer() INITIALISATION_ONLY;
    inline virtual ~Decrementer()
    {
    }

  private:
    Decrementer(const Decrementer &);
    Decrementer &operator=(const Decrementer &);

    //
    // InterruptHandler interface
    //
    virtual void interrupt(size_t interruptNumber, InterruptState &state);

    TimerHandler *m_Handler;

    uint32_t m_Frequency;

    static Decrementer m_Instance;
};

#endif