root.hh

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/*
 * Copyright (c) 2020 ARM Limited
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 * 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) 2011 Advanced Micro Devices, Inc.
 * 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
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#ifndef __SIM_ROOT_HH__
#define __SIM_ROOT_HH__
 
#include "base/statistics.hh"
#include "base/time.hh"
#include "base/types.hh"
#include "params/Root.hh"
#include "sim/eventq.hh"
#include "sim/globals.hh"
#include "sim/sim_object.hh"
 
namespace gem5
{
 
class Root : public SimObject
{
  private:
    static Root *_root;
 
  protected:
    bool _enabled;
    Time _period;
    Tick _periodTick;
    Time _spinThreshold;
 
    Time lastTime;
 
    Globals globals;
 
    void timeSync();
    EventFunctionWrapper syncEvent;
 
  public:
    static Root *
    root()
    {
        assert(_root);
        return _root;
    }
 
  public: // Global statistics
    struct RootStats : public statistics::Group
    {
        void resetStats() override;
 
        statistics::Formula simSeconds;
        statistics::Value simTicks;
        statistics::Value finalTick;
        statistics::Value simFreq;
        statistics::Value hostSeconds;
 
        statistics::Formula hostTickRate;
        statistics::Value hostMemory;
 
        static RootStats instance;
 
      private:
        RootStats();
 
        RootStats(const RootStats &) = delete;
        RootStats &operator=(const RootStats &) = delete;
 
        Time statTime;
        Tick startTick;
    };
 
  public:
 
    bool timeSyncEnabled() const { return _enabled; }
    const Time timeSyncPeriod() const { return _period; }
    const Time timeSyncSpinThreshold() const { return _spinThreshold; }
 
    void timeSyncEnable(bool en);
    void timeSyncPeriod(Time newPeriod);
    void timeSyncSpinThreshold(Time newThreshold);
 
    PARAMS(Root);
 
    // The int parameter is ignored, it's just so we can define a custom
    // create() method.
    Root(const Params &p, int);
 
    void startup() override;
 
    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;
};
 
extern Root::RootStats &rootStats;
 
} // namespace gem5
 
#endif // __SIM_ROOT_HH__