base.hh

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/*
 * Copyright (c) 2011-2012,2015,2018,2020 ARM Limited
 * Copyright (c) 2013 Advanced Micro Devices, Inc.
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 * not be construed as granting a license to any other intellectual
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 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
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 *
 * Copyright (c) 2002-2005 The Regents of The University of Michigan
 * 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 __CPU_SIMPLE_BASE_HH__
#define __CPU_SIMPLE_BASE_HH__
 
#include "base/statistics.hh"
#include "config/the_isa.hh"
#include "cpu/base.hh"
#include "cpu/checker/cpu.hh"
#include "cpu/exec_context.hh"
#include "cpu/pc_event.hh"
#include "cpu/simple_thread.hh"
#include "cpu/static_inst.hh"
#include "mem/packet.hh"
#include "mem/port.hh"
#include "mem/request.hh"
#include "sim/eventq.hh"
#include "sim/full_system.hh"
#include "sim/system.hh"
 
// forward declarations
class Checkpoint;
class Process;
class Processor;
class ThreadContext;
 
namespace TheISA
{
    class DTB;
    class ITB;
}
 
namespace Trace {
    class InstRecord;
}
 
struct BaseSimpleCPUParams;
class BPredUnit;
class SimpleExecContext;
 
class BaseSimpleCPU : public BaseCPU
{
  protected:
    ThreadID curThread;
    BPredUnit *branchPred;
 
    void checkPcEventQueue();
    void swapActiveThread();
 
  public:
    BaseSimpleCPU(BaseSimpleCPUParams *params);
    virtual ~BaseSimpleCPU();
    void wakeup(ThreadID tid) override;
    void init() override;
  public:
    Trace::InstRecord *traceData;
    CheckerCPU *checker;
 
    std::vector<SimpleExecContext*> threadInfo;
    std::list<ThreadID> activeThreads;
 
    TheISA::MachInst inst;
    StaticInstPtr curStaticInst;
    StaticInstPtr curMacroStaticInst;
 
  protected:
    enum Status {
        Idle,
        Running,
        Faulting,
        ITBWaitResponse,
        IcacheRetry,
        IcacheWaitResponse,
        IcacheWaitSwitch,
        DTBWaitResponse,
        DcacheRetry,
        DcacheWaitResponse,
        DcacheWaitSwitch,
    };
 
    Status _status;
 
    void traceFault();
 
  public:
    void checkForInterrupts();
    void setupFetchRequest(const RequestPtr &req);
    void preExecute();
    void postExecute();
    void advancePC(const Fault &fault);
 
    void haltContext(ThreadID thread_num) override;
 
    // statistics
    void regStats() override;
    void resetStats() override;
 
    virtual Fault readMem(Addr addr, uint8_t* data, unsigned size,
                          Request::Flags flags,
                          const std::vector<bool>& byte_enable =
                              std::vector<bool>())
    { panic("readMem() is not implemented\n"); }
 
    virtual Fault initiateMemRead(Addr addr, unsigned size,
                                  Request::Flags flags,
                                  const std::vector<bool>& byte_enable =
                                      std::vector<bool>())
    { panic("initiateMemRead() is not implemented\n"); }
 
    virtual Fault writeMem(uint8_t* data, unsigned size, Addr addr,
                           Request::Flags flags, uint64_t* res,
                           const std::vector<bool>& byte_enable =
                               std::vector<bool>())
    { panic("writeMem() is not implemented\n"); }
 
    virtual Fault amoMem(Addr addr, uint8_t* data, unsigned size,
                         Request::Flags flags,
                         AtomicOpFunctorPtr amo_op)
    { panic("amoMem() is not implemented\n"); }
 
    virtual Fault initiateMemAMO(Addr addr, unsigned size,
                                 Request::Flags flags,
                                 AtomicOpFunctorPtr amo_op)
    { panic("initiateMemAMO() is not implemented\n"); }
 
    void countInst();
    Counter totalInsts() const override;
    Counter totalOps() const override;
 
    void serializeThread(CheckpointOut &cp, ThreadID tid) const override;
    void unserializeThread(CheckpointIn &cp, ThreadID tid) override;
 
    virtual Fault initiateHtmCmd(Request::Flags flags) = 0;
 
    virtual void htmSendAbortSignal(HtmFailureFaultCause cause) = 0;
};
 
#endif // __CPU_SIMPLE_BASE_HH__