cpu.hh

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· HH 代码 · 共 732 行 · 第 1/2 页

/*
 * Copyright (c) 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * Authors: Kevin T. Lim
 *          Korey L. Sewell
 */

#ifndef __CPU_O3_CPU_HH__
#define __CPU_O3_CPU_HH__

#include <iostream>
#include <list>
#include <queue>
#include <set>
#include <vector>

#include "arch/types.hh"
#include "base/statistics.hh"
#include "base/timebuf.hh"
#include "config/full_system.hh"
#include "config/use_checker.hh"
#include "cpu/activity.hh"
#include "cpu/base.hh"
#include "cpu/simple_thread.hh"
#include "cpu/o3/comm.hh"
#include "cpu/o3/cpu_policy.hh"
#include "cpu/o3/scoreboard.hh"
#include "cpu/o3/thread_state.hh"
//#include "cpu/o3/thread_context.hh"
#include "sim/process.hh"

template <class>
class Checker;
class ThreadContext;
template <class>
class O3ThreadContext;

class Checkpoint;
class MemObject;
class Process;

class BaseO3CPU : public BaseCPU
{
    //Stuff that's pretty ISA independent will go here.
  public:
    typedef BaseCPU::Params Params;

    BaseO3CPU(Params *params);

    void regStats();

    /** Sets this CPU's ID. */
    void setCpuId(int id) { cpu_id = id; }

    /** Reads this CPU's ID. */
    int readCpuId() { return cpu_id; }

  protected:
    int cpu_id;
};

/**
 * FullO3CPU class, has each of the stages (fetch through commit)
 * within it, as well as all of the time buffers between stages.  The
 * tick() function for the CPU is defined here.
 */
template <class Impl>
class FullO3CPU : public BaseO3CPU
{
  public:
    // Typedefs from the Impl here.
    typedef typename Impl::CPUPol CPUPolicy;
    typedef typename Impl::DynInstPtr DynInstPtr;
    typedef typename Impl::O3CPU O3CPU;
    typedef typename Impl::Params Params;

    typedef O3ThreadState<Impl> Thread;

    typedef typename std::list<DynInstPtr>::iterator ListIt;

    friend class O3ThreadContext<Impl>;

  public:
    enum Status {
        Running,
        Idle,
        Halted,
        Blocked,
        SwitchedOut
    };

    TheISA::ITB * itb;
    TheISA::DTB * dtb;

    /** Overall CPU status. */
    Status _status;

    /** Per-thread status in CPU, used for SMT.  */
    Status _threadStatus[Impl::MaxThreads];

  private:
    class TickEvent : public Event
    {
      private:
        /** Pointer to the CPU. */
        FullO3CPU<Impl> *cpu;

      public:
        /** Constructs a tick event. */
        TickEvent(FullO3CPU<Impl> *c);

        /** Processes a tick event, calling tick() on the CPU. */
        void process();
        /** Returns the description of the tick event. */
        const char *description() const;
    };

    /** The tick event used for scheduling CPU ticks. */
    TickEvent tickEvent;

    /** Schedule tick event, regardless of its current state. */
    void scheduleTickEvent(int delay)
    {
        if (tickEvent.squashed())
            tickEvent.reschedule(nextCycle(curTick + ticks(delay)));
        else if (!tickEvent.scheduled())
            tickEvent.schedule(nextCycle(curTick + ticks(delay)));
    }

    /** Unschedule tick event, regardless of its current state. */
    void unscheduleTickEvent()
    {
        if (tickEvent.scheduled())
            tickEvent.squash();
    }

    class ActivateThreadEvent : public Event
    {
      private:
        /** Number of Thread to Activate */
        int tid;

        /** Pointer to the CPU. */
        FullO3CPU<Impl> *cpu;

      public:
        /** Constructs the event. */
        ActivateThreadEvent();

        /** Initialize Event */
        void init(int thread_num, FullO3CPU<Impl> *thread_cpu);

        /** Processes the event, calling activateThread() on the CPU. */
        void process();

        /** Returns the description of the event. */
        const char *description() const;
    };

    /** Schedule thread to activate , regardless of its current state. */
    void scheduleActivateThreadEvent(int tid, int delay)
    {
        // Schedule thread to activate, regardless of its current state.
        if (activateThreadEvent[tid].squashed())
            activateThreadEvent[tid].
                reschedule(nextCycle(curTick + ticks(delay)));
        else if (!activateThreadEvent[tid].scheduled())
            activateThreadEvent[tid].
                schedule(nextCycle(curTick + ticks(delay)));
    }

    /** Unschedule actiavte thread event, regardless of its current state. */
    void unscheduleActivateThreadEvent(int tid)
    {
        if (activateThreadEvent[tid].scheduled())
            activateThreadEvent[tid].squash();
    }

    /** The tick event used for scheduling CPU ticks. */
    ActivateThreadEvent activateThreadEvent[Impl::MaxThreads];

    class DeallocateContextEvent : public Event
    {
      private:
        /** Number of Thread to deactivate */
        int tid;

        /** Should the thread be removed from the CPU? */
        bool remove;

        /** Pointer to the CPU. */
        FullO3CPU<Impl> *cpu;

      public:
        /** Constructs the event. */
        DeallocateContextEvent();

        /** Initialize Event */
        void init(int thread_num, FullO3CPU<Impl> *thread_cpu);

        /** Processes the event, calling activateThread() on the CPU. */
        void process();

        /** Sets whether the thread should also be removed from the CPU. */
        void setRemove(bool _remove) { remove = _remove; }

        /** Returns the description of the event. */
        const char *description() const;
    };

    /** Schedule cpu to deallocate thread context.*/
    void scheduleDeallocateContextEvent(int tid, bool remove, int delay)
    {
        // Schedule thread to activate, regardless of its current state.
        if (deallocateContextEvent[tid].squashed())
            deallocateContextEvent[tid].
                reschedule(nextCycle(curTick + ticks(delay)));
        else if (!deallocateContextEvent[tid].scheduled())
            deallocateContextEvent[tid].
                schedule(nextCycle(curTick + ticks(delay)));
    }

    /** Unschedule thread deallocation in CPU */
    void unscheduleDeallocateContextEvent(int tid)
    {
        if (deallocateContextEvent[tid].scheduled())
            deallocateContextEvent[tid].squash();
    }

    /** The tick event used for scheduling CPU ticks. */
    DeallocateContextEvent deallocateContextEvent[Impl::MaxThreads];

  public:
    /** Constructs a CPU with the given parameters. */
    FullO3CPU(O3CPU *o3_cpu, Params *params);
    /** Destructor. */
    ~FullO3CPU();

    /** Registers statistics. */
    void fullCPURegStats();

    void demapPage(Addr vaddr, uint64_t asn)
    {
        this->itb->demapPage(vaddr, asn);
        this->dtb->demapPage(vaddr, asn);
    }

    void demapInstPage(Addr vaddr, uint64_t asn)
    {
        this->itb->demapPage(vaddr, asn);
    }

    void demapDataPage(Addr vaddr, uint64_t asn)
    {
        this->dtb->demapPage(vaddr, asn);
    }

    /** Translates instruction requestion. */
    Fault translateInstReq(RequestPtr &req, Thread *thread)
    {
        return this->itb->translate(req, thread->getTC());
    }

    /** Translates data read request. */
    Fault translateDataReadReq(RequestPtr &req, Thread *thread)
    {
        return this->dtb->translate(req, thread->getTC(), false);
    }

    /** Translates data write request. */
    Fault translateDataWriteReq(RequestPtr &req, Thread *thread)
    {
        return this->dtb->translate(req, thread->getTC(), true);
    }

    /** Returns a specific port. */
    Port *getPort(const std::string &if_name, int idx);

    /** Ticks CPU, calling tick() on each stage, and checking the overall
     *  activity to see if the CPU should deschedule itself.
     */
    void tick();

    /** Initialize the CPU */
    void init();

    /** Returns the Number of Active Threads in the CPU */
    int numActiveThreads()
    { return activeThreads.size(); }

    /** Add Thread to Active Threads List */
    void activateThread(unsigned tid);

    /** Remove Thread from Active Threads List */
    void deactivateThread(unsigned tid);

    /** Setup CPU to insert a thread's context */
    void insertThread(unsigned tid);

    /** Remove all of a thread's context from CPU */
    void removeThread(unsigned tid);

    /** Count the Total Instructions Committed in the CPU. */
    virtual Counter totalInstructions() const
    {
        Counter total(0);

        for (int i=0; i < thread.size(); i++)
            total += thread[i]->numInst;

        return total;
    }

    /** Add Thread to Active Threads List. */
    void activateContext(int tid, int delay);

    /** Remove Thread from Active Threads List */
    void suspendContext(int tid);

    /** Remove Thread from Active Threads List &&
     *  Possibly Remove Thread Context from CPU.
     */
    bool deallocateContext(int tid, bool remove, int delay = 1);

    /** Remove Thread from Active Threads List &&
     *  Remove Thread Context from CPU.
     */
    void haltContext(int tid);

    /** Activate a Thread When CPU Resources are Available. */
    void activateWhenReady(int tid);

    /** Add or Remove a Thread Context in the CPU. */
    void doContextSwitch();

    /** Update The Order In Which We Process Threads. */
    void updateThreadPriority();

    /** Serialize state. */
    virtual void serialize(std::ostream &os);

    /** Unserialize from a checkpoint. */