base.hh

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/*
 * Copyright (c) 2011-2013, 2017 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.
 *
 * Copyright (c) 2002-2005 The Regents of The University of Michigan
 * Copyright (c) 2011 Regents of the University of California
 * 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,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Steve Reinhardt
 *          Nathan Binkert
 *          Rick Strong
 */

#ifndef __CPU_BASE_HH__
#define __CPU_BASE_HH__

#include <vector>

// Before we do anything else, check if this build is the NULL ISA,
// and if so stop here
#include "config/the_isa.hh"
#if THE_ISA == NULL_ISA
#include "arch/null/cpu_dummy.hh"
#else
#include "arch/generic/interrupts.hh"
#include "arch/isa_traits.hh"
#include "arch/microcode_rom.hh"
#include "base/statistics.hh"
#include "sim/clocked_object.hh"
#include "sim/eventq.hh"
#include "sim/full_system.hh"
#include "sim/insttracer.hh"
#include "sim/probe/pmu.hh"
#include "sim/probe/probe.hh"
#include "sim/system.hh"
#include "debug/Mwait.hh"

class BaseCPU;
struct BaseCPUParams;
class CheckerCPU;
class ThreadContext;

struct AddressMonitor
{
    AddressMonitor();
    bool doMonitor(PacketPtr pkt);

    bool armed;
    Addr vAddr;
    Addr pAddr;
    uint64_t val;
    bool waiting;   // 0=normal, 1=mwaiting
    bool gotWakeup;
};

class CPUProgressEvent : public Event
{
  protected:
    Tick _interval;
    Counter lastNumInst;
    BaseCPU *cpu;
    bool _repeatEvent;

  public:
    CPUProgressEvent(BaseCPU *_cpu, Tick ival = 0);

    void process();

    void interval(Tick ival) { _interval = ival; }
    Tick interval() { return _interval; }

    void repeatEvent(bool repeat) { _repeatEvent = repeat; }

    virtual const char *description() const;
};

class BaseCPU : public ClockedObject
{
  protected:

    Tick instCnt;

    // every cpu has an id, put it in the base cpu
    // Set at initialization, only time a cpuId might change is during a
    // takeover (which should be done from within the BaseCPU anyway,
    // therefore no setCpuId() method is provided
    int _cpuId;

    const uint32_t _socketId;

    MasterID _instMasterId;

    MasterID _dataMasterId;

    uint32_t _taskId;

    uint32_t _pid;

    bool _switchedOut;

    const unsigned int _cacheLineSize;

  public:

    virtual Port &getDataPort() = 0;

    virtual PortProxy::SendFunctionalFunc
    getSendFunctional()
    {
        auto port = dynamic_cast<MasterPort *>(&getDataPort());
        assert(port);
        return [port](PacketPtr pkt)->void { port->sendFunctional(pkt); };
    }

    virtual Port &getInstPort() = 0;

    int cpuId() const { return _cpuId; }

    uint32_t socketId() const { return _socketId; }

    MasterID dataMasterId() const { return _dataMasterId; }
    MasterID instMasterId() const { return _instMasterId; }

    Port &getPort(const std::string &if_name,
                  PortID idx=InvalidPortID) override;

    uint32_t taskId() const { return _taskId; }
    void taskId(uint32_t id) { _taskId = id; }

    uint32_t getPid() const { return _pid; }
    void setPid(uint32_t pid) { _pid = pid; }

    inline void workItemBegin() { numWorkItemsStarted++; }
    inline void workItemEnd() { numWorkItemsCompleted++; }
    // @todo remove me after debugging with legion done
    Tick instCount() { return instCnt; }

    TheISA::MicrocodeRom microcodeRom;

  protected:
    std::vector<BaseInterrupts*> interrupts;

  public:
    BaseInterrupts *
    getInterruptController(ThreadID tid)
    {
        if (interrupts.empty())
            return NULL;

        assert(interrupts.size() > tid);
        return interrupts[tid];
    }

    virtual void wakeup(ThreadID tid) = 0;

    void
    postInterrupt(ThreadID tid, int int_num, int index)
    {
        interrupts[tid]->post(int_num, index);
        if (FullSystem)
            wakeup(tid);
    }

    void
    clearInterrupt(ThreadID tid, int int_num, int index)
    {
        interrupts[tid]->clear(int_num, index);
    }

    void
    clearInterrupts(ThreadID tid)
    {
        interrupts[tid]->clearAll();
    }

    bool
    checkInterrupts(ThreadContext *tc) const
    {
        return FullSystem && interrupts[tc->threadId()]->checkInterrupts(tc);
    }

    void processProfileEvent();
    EventFunctionWrapper * profileEvent;

  protected:
    std::vector<ThreadContext *> threadContexts;

    Trace::InstTracer * tracer;

  public:


    static const uint32_t invldPid = std::numeric_limits<uint32_t>::max();

    // Mask to align PCs to MachInst sized boundaries
    static const Addr PCMask = ~((Addr)sizeof(TheISA::MachInst) - 1);

    Trace::InstTracer * getTracer() { return tracer; }

    virtual void activateContext(ThreadID thread_num);

    virtual void suspendContext(ThreadID thread_num);

    virtual void haltContext(ThreadID thread_num);

   int findContext(ThreadContext *tc);

   virtual ThreadContext *getContext(int tn) { return threadContexts[tn]; }

   unsigned numContexts() {
       return static_cast<unsigned>(threadContexts.size());
   }

    ThreadID contextToThread(ContextID cid)
    { return static_cast<ThreadID>(cid - threadContexts[0]->contextId()); }

  public:
    typedef BaseCPUParams Params;
    const Params *params() const
    { return reinterpret_cast<const Params *>(_params); }
    BaseCPU(Params *params, bool is_checker = false);
    virtual ~BaseCPU();

    void init() override;
    void startup() override;
    void regStats() override;

    void regProbePoints() override;

    void registerThreadContexts();

    // Functions to deschedule and reschedule the events to enter the
    // power gating sleep before and after checkpoiting respectively.
    void deschedulePowerGatingEvent();
    void schedulePowerGatingEvent();

    virtual void switchOut();

    virtual void takeOverFrom(BaseCPU *cpu);

    void flushTLBs();

    bool switchedOut() const { return _switchedOut; }

    virtual void verifyMemoryMode() const { };

    ThreadID numThreads;

    System *system;

    inline unsigned int cacheLineSize() const { return _cacheLineSize; }

    void serialize(CheckpointOut &cp) const override;

    void unserialize(CheckpointIn &cp) override;

    virtual void serializeThread(CheckpointOut &cp, ThreadID tid) const {};

    virtual void unserializeThread(CheckpointIn &cp, ThreadID tid) {};

    virtual Counter totalInsts() const = 0;

    virtual Counter totalOps() const = 0;

    void scheduleInstStop(ThreadID tid, Counter insts, const char *cause);

    uint64_t getCurrentInstCount(ThreadID tid);

  public:
    virtual void probeInstCommit(const StaticInstPtr &inst, Addr pc);

   protected:
    ProbePoints::PMUUPtr pmuProbePoint(const char *name);

    ProbePoints::PMUUPtr ppRetiredInsts;
    ProbePoints::PMUUPtr ppRetiredInstsPC;

    ProbePoints::PMUUPtr ppRetiredLoads;
    ProbePoints::PMUUPtr ppRetiredStores;

    ProbePoints::PMUUPtr ppRetiredBranches;

    ProbePoints::PMUUPtr ppAllCycles;

    ProbePoints::PMUUPtr ppActiveCycles;

    ProbePointArg<bool> *ppSleeping;
    enum CPUState {
        CPU_STATE_ON,
        CPU_STATE_SLEEP,
        CPU_STATE_WAKEUP
    };

    Cycles previousCycle;
    CPUState previousState;

    inline void updateCycleCounters(CPUState state)
    {
        uint32_t delta = curCycle() - previousCycle;

        if (previousState == CPU_STATE_ON) {
            ppActiveCycles->notify(delta);
        }

        switch (state)
        {
          case CPU_STATE_WAKEUP:
            ppSleeping->notify(false);
            break;
          case CPU_STATE_SLEEP:
            ppSleeping->notify(true);
            break;
          default:
            break;
        }

        ppAllCycles->notify(delta);

        previousCycle = curCycle();
        previousState = state;
    }

    // Function tracing
  private:
    bool functionTracingEnabled;
    std::ostream *functionTraceStream;
    Addr currentFunctionStart;
    Addr currentFunctionEnd;
    Tick functionEntryTick;
    void enableFunctionTrace();
    void traceFunctionsInternal(Addr pc);

  private:
    static std::vector<BaseCPU *> cpuList;   

  public:
    void traceFunctions(Addr pc)
    {
        if (functionTracingEnabled)
            traceFunctionsInternal(pc);
    }

    static int numSimulatedCPUs() { return cpuList.size(); }
    static Counter numSimulatedInsts()
    {
        Counter total = 0;

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

        return total;
    }

    static Counter numSimulatedOps()
    {
        Counter total = 0;

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

        return total;
    }

  public:
    // Number of CPU cycles simulated
    Stats::Scalar numCycles;
    Stats::Scalar numWorkItemsStarted;
    Stats::Scalar numWorkItemsCompleted;

  private:
    std::vector<AddressMonitor> addressMonitor;

  public:
    void armMonitor(ThreadID tid, Addr address);
    bool mwait(ThreadID tid, PacketPtr pkt);
    void mwaitAtomic(ThreadID tid, ThreadContext *tc, BaseTLB *dtb);
    AddressMonitor *getCpuAddrMonitor(ThreadID tid)
    {
        assert(tid < numThreads);
        return &addressMonitor[tid];
    }

    bool waitForRemoteGDB() const;

    Cycles syscallRetryLatency;

  // Enables CPU to enter power gating on a configurable cycle count
  protected:
    void enterPwrGating();

    const Cycles pwrGatingLatency;
    const bool powerGatingOnIdle;
    EventFunctionWrapper enterPwrGatingEvent;
};

#endif // THE_ISA == NULL_ISA

#endif // __CPU_BASE_HH__