base.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 420 行

/*
 * Copyright (c) 2002, 2003, 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: Steven K. Reinhardt
 *          David A. Greene
 *          Nathan L. Binkert
 */

#ifndef __CPU_SIMPLE_BASE_HH__
#define __CPU_SIMPLE_BASE_HH__

#include "arch/predecoder.hh"
#include "base/statistics.hh"
#include "config/full_system.hh"
#include "cpu/base.hh"
#include "cpu/simple_thread.hh"
#include "cpu/pc_event.hh"
#include "cpu/static_inst.hh"
#include "mem/packet.hh"
#include "mem/port.hh"
#include "mem/request.hh"
#include "sim/eventq.hh"
#include "sim/system.hh"

// forward declarations
#if FULL_SYSTEM
class Processor;
namespace TheISA
{
    class ITB;
    class DTB;
}
class MemObject;

#else

class Process;

#endif // FULL_SYSTEM

class RemoteGDB;
class GDBListener;

namespace TheISA
{
    class Predecoder;
}
class ThreadContext;
class Checkpoint;

namespace Trace {
    class InstRecord;
}


class BaseSimpleCPU : public BaseCPU
{
  protected:
    typedef TheISA::MiscReg MiscReg;
    typedef TheISA::FloatReg FloatReg;
    typedef TheISA::FloatRegBits FloatRegBits;

  protected:
    Trace::InstRecord *traceData;

    inline void checkPcEventQueue() {
        Addr oldpc;
        do {
            oldpc = thread->readPC();
            system->pcEventQueue.service(tc);
        } while (oldpc != thread->readPC());
    }

  public:
    void post_interrupt(int int_num, int index);

    void zero_fill_64(Addr addr) {
      static int warned = 0;
      if (!warned) {
        warn ("WH64 is not implemented");
        warned = 1;
      }
    };

  public:
    struct Params : public BaseCPU::Params
    {
        TheISA::ITB *itb;
        TheISA::DTB *dtb;
#if !FULL_SYSTEM
        Process *process;
#endif
    };
    BaseSimpleCPU(Params *params);
    virtual ~BaseSimpleCPU();

  public:
    /** SimpleThread object, provides all the architectural state. */
    SimpleThread *thread;

    /** ThreadContext object, provides an interface for external
     * objects to modify this thread's state.
     */
    ThreadContext *tc;
  protected:
    int cpuId;

  public:

#if FULL_SYSTEM
    Addr dbg_vtophys(Addr addr);

    bool interval_stats;
#endif

    // current instruction
    TheISA::MachInst inst;

    // The predecoder
    TheISA::Predecoder predecoder;

    StaticInstPtr curStaticInst;
    StaticInstPtr curMacroStaticInst;

    //This is the offset from the current pc that fetch should be performed at
    Addr fetchOffset;
    //This flag says to stay at the current pc. This is useful for
    //instructions which go beyond MachInst boundaries.
    bool stayAtPC;

    void checkForInterrupts();
    Fault setupFetchRequest(Request *req);
    void preExecute();
    void postExecute();
    void advancePC(Fault fault);

    virtual void deallocateContext(int thread_num);
    virtual void haltContext(int thread_num);

    // statistics
    virtual void regStats();
    virtual void resetStats();

    // number of simulated instructions
    Counter numInst;
    Counter startNumInst;
    Stats::Scalar<> numInsts;

    void countInst()
    {
        numInst++;
        numInsts++;

        thread->funcExeInst++;
    }

    virtual Counter totalInstructions() const
    {
        return numInst - startNumInst;
    }

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

    // number of simulated memory references
    Stats::Scalar<> numMemRefs;

    // number of simulated loads
    Counter numLoad;
    Counter startNumLoad;

    // number of idle cycles
    Stats::Average<> notIdleFraction;
    Stats::Formula idleFraction;

    // number of cycles stalled for I-cache responses
    Stats::Scalar<> icacheStallCycles;
    Counter lastIcacheStall;

    // number of cycles stalled for I-cache retries
    Stats::Scalar<> icacheRetryCycles;
    Counter lastIcacheRetry;

    // number of cycles stalled for D-cache responses
    Stats::Scalar<> dcacheStallCycles;
    Counter lastDcacheStall;

    // number of cycles stalled for D-cache retries
    Stats::Scalar<> dcacheRetryCycles;
    Counter lastDcacheRetry;

    virtual void serialize(std::ostream &os);
    virtual void unserialize(Checkpoint *cp, const std::string &section);

    // These functions are only used in CPU models that split
    // effective address computation from the actual memory access.
    void setEA(Addr EA) { panic("BaseSimpleCPU::setEA() not implemented\n"); }
    Addr getEA() 	{ panic("BaseSimpleCPU::getEA() not implemented\n");
        M5_DUMMY_RETURN}

    void prefetch(Addr addr, unsigned flags)
    {
        // need to do this...
    }

    void writeHint(Addr addr, int size, unsigned flags)
    {
        // need to do this...
    }


    Fault copySrcTranslate(Addr src);

    Fault copy(Addr dest);

    // The register accessor methods provide the index of the
    // instruction's operand (e.g., 0 or 1), not the architectural
    // register index, to simplify the implementation of register
    // renaming.  We find the architectural register index by indexing
    // into the instruction's own operand index table.  Note that a
    // raw pointer to the StaticInst is provided instead of a
    // ref-counted StaticInstPtr to redice overhead.  This is fine as
    // long as these methods don't copy the pointer into any long-term
    // storage (which is pretty hard to imagine they would have reason
    // to do).

    uint64_t readIntRegOperand(const StaticInst *si, int idx)
    {
        return thread->readIntReg(si->srcRegIdx(idx));
    }

    FloatReg readFloatRegOperand(const StaticInst *si, int idx, int width)
    {
        int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
        return thread->readFloatReg(reg_idx, width);
    }

    FloatReg readFloatRegOperand(const StaticInst *si, int idx)
    {
        int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
        return thread->readFloatReg(reg_idx);
    }

    FloatRegBits readFloatRegOperandBits(const StaticInst *si, int idx,
                                         int width)
    {
        int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
        return thread->readFloatRegBits(reg_idx, width);
    }

    FloatRegBits readFloatRegOperandBits(const StaticInst *si, int idx)
    {
        int reg_idx = si->srcRegIdx(idx) - TheISA::FP_Base_DepTag;
        return thread->readFloatRegBits(reg_idx);
    }

    void setIntRegOperand(const StaticInst *si, int idx, uint64_t val)
    {
        thread->setIntReg(si->destRegIdx(idx), val);
    }

    void setFloatRegOperand(const StaticInst *si, int idx, FloatReg val,
                            int width)
    {
        int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
        thread->setFloatReg(reg_idx, val, width);
    }

    void setFloatRegOperand(const StaticInst *si, int idx, FloatReg val)
    {
        int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
        thread->setFloatReg(reg_idx, val);
    }

    void setFloatRegOperandBits(const StaticInst *si, int idx,
                                FloatRegBits val, int width)
    {
        int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
        thread->setFloatRegBits(reg_idx, val, width);
    }

    void setFloatRegOperandBits(const StaticInst *si, int idx,
                                FloatRegBits val)
    {
        int reg_idx = si->destRegIdx(idx) - TheISA::FP_Base_DepTag;
        thread->setFloatRegBits(reg_idx, val);
    }

    uint64_t readPC() { return thread->readPC(); }
    uint64_t readMicroPC() { return thread->readMicroPC(); }
    uint64_t readNextPC() { return thread->readNextPC(); }
    uint64_t readNextMicroPC() { return thread->readNextMicroPC(); }
    uint64_t readNextNPC() { return thread->readNextNPC(); }

    void setPC(uint64_t val) { thread->setPC(val); }
    void setMicroPC(uint64_t val) { thread->setMicroPC(val); }
    void setNextPC(uint64_t val) { thread->setNextPC(val); }
    void setNextMicroPC(uint64_t val) { thread->setNextMicroPC(val); }
    void setNextNPC(uint64_t val) { thread->setNextNPC(val); }

    MiscReg readMiscRegNoEffect(int misc_reg)
    {
        return thread->readMiscRegNoEffect(misc_reg);
    }

    MiscReg readMiscReg(int misc_reg)
    {
        return thread->readMiscReg(misc_reg);
    }

    void setMiscRegNoEffect(int misc_reg, const MiscReg &val)
    {
        return thread->setMiscRegNoEffect(misc_reg, val);
    }

    void setMiscReg(int misc_reg, const MiscReg &val)
    {
        return thread->setMiscReg(misc_reg, val);
    }

    MiscReg readMiscRegOperandNoEffect(const StaticInst *si, int idx)
    {
        int reg_idx = si->srcRegIdx(idx) - TheISA::Ctrl_Base_DepTag;
        return thread->readMiscRegNoEffect(reg_idx);
    }

    MiscReg readMiscRegOperand(const StaticInst *si, int idx)
    {
        int reg_idx = si->srcRegIdx(idx) - TheISA::Ctrl_Base_DepTag;
        return thread->readMiscReg(reg_idx);
    }

    void setMiscRegOperandNoEffect(const StaticInst *si, int idx, const MiscReg &val)
    {
        int reg_idx = si->destRegIdx(idx) - TheISA::Ctrl_Base_DepTag;
        return thread->setMiscRegNoEffect(reg_idx, val);
    }

    void setMiscRegOperand(
            const StaticInst *si, int idx, const MiscReg &val)
    {
        int reg_idx = si->destRegIdx(idx) - TheISA::Ctrl_Base_DepTag;
        return thread->setMiscReg(reg_idx, val);
    }

    void demapPage(Addr vaddr, uint64_t asn)
    {
        thread->demapPage(vaddr, asn);
    }

    void demapInstPage(Addr vaddr, uint64_t asn)
    {
        thread->demapInstPage(vaddr, asn);
    }

    void demapDataPage(Addr vaddr, uint64_t asn)
    {
        thread->demapDataPage(vaddr, asn);
    }

    unsigned readStCondFailures() {
        return thread->readStCondFailures();
    }

    void setStCondFailures(unsigned sc_failures) {
        thread->setStCondFailures(sc_failures);
    }

     MiscReg readRegOtherThread(int regIdx, int tid = -1)
     {
        panic("Simple CPU models do not support multithreaded "
              "register access.\n");
     }

     void setRegOtherThread(int regIdx, const MiscReg &val, int tid = -1)
     {
        panic("Simple CPU models do not support multithreaded "
              "register access.\n");
     }

    //Fault CacheOp(uint8_t Op, Addr EA);

#if FULL_SYSTEM
    Fault hwrei() { return thread->hwrei(); }
    void ev5_trap(Fault fault) { fault->invoke(tc); }
    bool simPalCheck(int palFunc) { return thread->simPalCheck(palFunc); }
#else
    void syscall(int64_t callnum) { thread->syscall(callnum); }
#endif

    bool misspeculating() { return thread->misspeculating(); }
    ThreadContext *tcBase() { return tc; }
};

#endif // __CPU_SIMPLE_BASE_HH__