cpu.hh

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/*
 * Copyright (c) 2012-2014 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
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * 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
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 * 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
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * Authors: Andrew Bardsley
 */

#ifndef __CPU_MINOR_CPU_HH__
#define __CPU_MINOR_CPU_HH__

#include "cpu/minor/activity.hh"
#include "cpu/minor/stats.hh"
#include "cpu/base.hh"
#include "cpu/simple_thread.hh"
#include "enums/ThreadPolicy.hh"
#include "params/MinorCPU.hh"

namespace Minor
{
class Pipeline;

typedef SimpleThread MinorThread;
};

class MinorCPU : public BaseCPU
{
  protected:
    Minor::Pipeline *pipeline;

  public:
    Minor::MinorActivityRecorder *activityRecorder;

    std::vector<Minor::MinorThread *> threads;

  public:
    class MinorCPUPort : public MasterPort
    {
      public:
        MinorCPU &cpu;

      public:
        MinorCPUPort(const std::string& name_, MinorCPU &cpu_)
            : MasterPort(name_, &cpu_), cpu(cpu_)
        { }

    };

    Enums::ThreadPolicy threadPolicy;
  protected:
    MasterPort &getDataPort() override;

    MasterPort &getInstPort() override;

  public:
    MinorCPU(MinorCPUParams *params);

    ~MinorCPU();

  public:
    void init() override;
    void startup() override;
    void wakeup(ThreadID tid) override;

    Addr dbg_vtophys(Addr addr);

    Minor::MinorStats stats;

    void regStats() override;

    Counter totalInsts() const override;
    Counter totalOps() const override;

    void serializeThread(CheckpointOut &cp, ThreadID tid) const override;
    void unserializeThread(CheckpointIn &cp, ThreadID tid) override;

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

    DrainState drain() override;
    void drainResume() override;
    void signalDrainDone();
    void memWriteback() override;

    void switchOut() override;
    void takeOverFrom(BaseCPU *old_cpu) override;

    void activateContext(ThreadID thread_id) override;
    void suspendContext(ThreadID thread_id) override;

    std::vector<ThreadID> roundRobinPriority(ThreadID priority)
    {
        std::vector<ThreadID> prio_list;
        for (ThreadID i = 1; i <= numThreads; i++) {
            prio_list.push_back((priority + i) % numThreads);
        }
        return prio_list;
    }

    std::vector<ThreadID> randomPriority()
    {
        std::vector<ThreadID> prio_list;
        for (ThreadID i = 0; i < numThreads; i++) {
            prio_list.push_back(i);
        }
        std::random_shuffle(prio_list.begin(), prio_list.end());
        return prio_list;
    }

    void wakeupOnEvent(unsigned int stage_id);
};

#endif /* __CPU_MINOR_CPU_HH__ */