simple_thread.cc

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」· CC 代码 · 共 315 行

/*
 * Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006
 * 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
 *          Nathan L. Binkert
 *          Lisa R. Hsu
 *          Kevin T. Lim
 */

#include <string>

#include "arch/isa_traits.hh"
#include "cpu/base.hh"
#include "cpu/simple_thread.hh"
#include "cpu/thread_context.hh"

#if FULL_SYSTEM
#include "arch/kernel_stats.hh"
#include "base/callback.hh"
#include "base/cprintf.hh"
#include "base/output.hh"
#include "base/trace.hh"
#include "cpu/profile.hh"
#include "cpu/quiesce_event.hh"
#include "sim/serialize.hh"
#include "sim/sim_exit.hh"
#include "arch/stacktrace.hh"
#else
#include "sim/process.hh"
#include "sim/system.hh"
#include "mem/translating_port.hh"
#endif

using namespace std;

// constructor
#if FULL_SYSTEM
SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num, System *_sys,
                           TheISA::ITB *_itb, TheISA::DTB *_dtb,
                           bool use_kernel_stats)
    : ThreadState(_cpu, -1, _thread_num), cpu(_cpu), system(_sys), itb(_itb),
      dtb(_dtb)

{
    tc = new ProxyThreadContext<SimpleThread>(this);

    quiesceEvent = new EndQuiesceEvent(tc);

    regs.clear();

    if (cpu->params->profile) {
        profile = new FunctionProfile(system->kernelSymtab);
        Callback *cb =
            new MakeCallback<SimpleThread,
            &SimpleThread::dumpFuncProfile>(this);
        registerExitCallback(cb);
    }

    // let's fill with a dummy node for now so we don't get a segfault
    // on the first cycle when there's no node available.
    static ProfileNode dummyNode;
    profileNode = &dummyNode;
    profilePC = 3;

    if (use_kernel_stats) {
        kernelStats = new TheISA::Kernel::Statistics(system);
    } else {
        kernelStats = NULL;
    }
}
#else
SimpleThread::SimpleThread(BaseCPU *_cpu, int _thread_num, Process *_process,
                           TheISA::ITB *_itb, TheISA::DTB *_dtb, int _asid)
    : ThreadState(_cpu, -1, _thread_num, _process, _asid),
      cpu(_cpu), itb(_itb), dtb(_dtb)
{
    regs.clear();
    tc = new ProxyThreadContext<SimpleThread>(this);
}

#endif

SimpleThread::SimpleThread()
#if FULL_SYSTEM
    : ThreadState(NULL, -1, -1)
#else
    : ThreadState(NULL, -1, -1, NULL, -1)
#endif
{
    tc = new ProxyThreadContext<SimpleThread>(this);
    regs.clear();
}

SimpleThread::~SimpleThread()
{
#if FULL_SYSTEM
    delete physPort;
    delete virtPort;
#endif
    delete tc;
}

void
SimpleThread::takeOverFrom(ThreadContext *oldContext)
{
    // some things should already be set up
#if FULL_SYSTEM
    assert(system == oldContext->getSystemPtr());
#else
    assert(process == oldContext->getProcessPtr());
#endif

    copyState(oldContext);
#if FULL_SYSTEM
    EndQuiesceEvent *quiesce = oldContext->getQuiesceEvent();
    if (quiesce) {
        // Point the quiesce event's TC at this TC so that it wakes up
        // the proper CPU.
        quiesce->tc = tc;
    }
    if (quiesceEvent) {
        quiesceEvent->tc = tc;
    }

    TheISA::Kernel::Statistics *stats = oldContext->getKernelStats();
    if (stats) {
        kernelStats = stats;
    }
#endif

    storeCondFailures = 0;

    oldContext->setStatus(ThreadContext::Unallocated);
}

void
SimpleThread::copyTC(ThreadContext *context)
{
    copyState(context);

#if FULL_SYSTEM
    EndQuiesceEvent *quiesce = context->getQuiesceEvent();
    if (quiesce) {
        quiesceEvent = quiesce;
    }
    TheISA::Kernel::Statistics *stats = context->getKernelStats();
    if (stats) {
        kernelStats = stats;
    }
#endif
}

void
SimpleThread::copyState(ThreadContext *oldContext)
{
    // copy over functional state
    _status = oldContext->status();
    copyArchRegs(oldContext);
    cpuId = oldContext->readCpuId();
#if !FULL_SYSTEM
    funcExeInst = oldContext->readFuncExeInst();
#endif
    inst = oldContext->getInst();
}

void
SimpleThread::serialize(ostream &os)
{
    ThreadState::serialize(os);
    regs.serialize(os);
    // thread_num and cpu_id are deterministic from the config
}


void
SimpleThread::unserialize(Checkpoint *cp, const std::string &section)
{
    ThreadState::unserialize(cp, section);
    regs.unserialize(cp, section);
    // thread_num and cpu_id are deterministic from the config
}

#if FULL_SYSTEM
void
SimpleThread::dumpFuncProfile()
{
    std::ostream *os = simout.create(csprintf("profile.%s.dat", cpu->name()));
    profile->dump(tc, *os);
}
#endif

void
SimpleThread::activate(int delay)
{
    if (status() == ThreadContext::Active)
        return;

    lastActivate = curTick;

//    if (status() == ThreadContext::Unallocated) {
//	cpu->activateWhenReady(tid);
//	return;
//   }

    _status = ThreadContext::Active;

    // status() == Suspended
    cpu->activateContext(tid, delay);
}

void
SimpleThread::suspend()
{
    if (status() == ThreadContext::Suspended)
        return;

    lastActivate = curTick;
    lastSuspend = curTick;
/*
#if FULL_SYSTEM
    // Don't change the status from active if there are pending interrupts
    if (cpu->check_interrupts()) {
        assert(status() == ThreadContext::Active);
        return;
    }
#endif
*/
    _status = ThreadContext::Suspended;
    cpu->suspendContext(tid);
}

void
SimpleThread::deallocate()
{
    if (status() == ThreadContext::Unallocated)
        return;

    _status = ThreadContext::Unallocated;
    cpu->deallocateContext(tid);
}

void
SimpleThread::halt()
{
    if (status() == ThreadContext::Halted)
        return;

    _status = ThreadContext::Halted;
    cpu->haltContext(tid);
}


void
SimpleThread::regStats(const string &name)
{
#if FULL_SYSTEM
    if (kernelStats)
        kernelStats->regStats(name + ".kern");
#endif
}

void
SimpleThread::copyArchRegs(ThreadContext *src_tc)
{
    TheISA::copyRegs(src_tc, tc);
}

#if FULL_SYSTEM
VirtualPort*
SimpleThread::getVirtPort(ThreadContext *src_tc)
{
    if (!src_tc)
        return virtPort;

    VirtualPort *vp = new VirtualPort("tc-vport", src_tc);
    connectToMemFunc(vp);
    return vp;
}

void
SimpleThread::delVirtPort(VirtualPort *vp)
{
    if (vp != virtPort) {
        vp->removeConn();
        delete vp;
    }
}

#endif