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/*
* Copyright (c) 2012-2014, 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.
*
* 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
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "cpu/minor/cpu.hh"
#include "arch/utility.hh"
#include "cpu/minor/dyn_inst.hh"
#include "cpu/minor/fetch1.hh"
#include "cpu/minor/pipeline.hh"
#include "debug/Drain.hh"
#include "debug/MinorCPU.hh"
#include "debug/Quiesce.hh"
MinorCPU::MinorCPU(MinorCPUParams *params) :
BaseCPU(params),
threadPolicy(params->threadPolicy)
{
/* This is only written for one thread at the moment */
Minor::MinorThread *thread;
for (ThreadID i = 0; i < numThreads; i++) {
if (FullSystem) {
thread = new Minor::MinorThread(this, i, params->system,
params->itb, params->dtb, params->isa[i]);
thread->setStatus(ThreadContext::Halted);
} else {
thread = new Minor::MinorThread(this, i, params->system,
params->workload[i], params->itb, params->dtb,
params->isa[i]);
}
threads.push_back(thread);
ThreadContext *tc = thread->getTC();
threadContexts.push_back(tc);
}
if (params->checker) {
fatal("The Minor model doesn't support checking (yet)\n");
}
Minor::MinorDynInst::init();
pipeline = new Minor::Pipeline(*this, *params);
activityRecorder = pipeline->getActivityRecorder();
}
MinorCPU::~MinorCPU()
{
delete pipeline;
for (ThreadID thread_id = 0; thread_id < threads.size(); thread_id++) {
delete threads[thread_id];
}
}
void
MinorCPU::init()
{
BaseCPU::init();
if (!params()->switched_out &&
system->getMemoryMode() != Enums::timing)
{
fatal("The Minor CPU requires the memory system to be in "
"'timing' mode.\n");
}
/* Initialise the ThreadContext's memory proxies */
for (ThreadID thread_id = 0; thread_id < threads.size(); thread_id++) {
ThreadContext *tc = getContext(thread_id);
tc->initMemProxies(tc);
}
}
/** Stats interface from SimObject (by way of BaseCPU) */
void
MinorCPU::regStats()
{
BaseCPU::regStats();
stats.regStats(name(), *this);
pipeline->regStats();
}
void
MinorCPU::serializeThread(CheckpointOut &cp, ThreadID thread_id) const
{
threads[thread_id]->serialize(cp);
}
void
MinorCPU::unserializeThread(CheckpointIn &cp, ThreadID thread_id)
{
threads[thread_id]->unserialize(cp);
}
void
MinorCPU::serialize(CheckpointOut &cp) const
{
pipeline->serialize(cp);
BaseCPU::serialize(cp);
}
void
MinorCPU::unserialize(CheckpointIn &cp)
{
pipeline->unserialize(cp);
BaseCPU::unserialize(cp);
}
void
MinorCPU::wakeup(ThreadID tid)
{
DPRINTF(Drain, "[tid:%d] MinorCPU wakeup\n", tid);
assert(tid < numThreads);
if (threads[tid]->status() == ThreadContext::Suspended) {
threads[tid]->activate();
}
}
void
MinorCPU::startup()
{
DPRINTF(MinorCPU, "MinorCPU startup\n");
BaseCPU::startup();
for (ThreadID tid = 0; tid < numThreads; tid++)
pipeline->wakeupFetch(tid);
}
DrainState
MinorCPU::drain()
{
// Deschedule any power gating event (if any)
deschedulePowerGatingEvent();
if (switchedOut()) {
DPRINTF(Drain, "Minor CPU switched out, draining not needed.\n");
return DrainState::Drained;
}
DPRINTF(Drain, "MinorCPU drain\n");
/* Need to suspend all threads and wait for Execute to idle.
* Tell Fetch1 not to fetch */
if (pipeline->drain()) {
DPRINTF(Drain, "MinorCPU drained\n");
return DrainState::Drained;
} else {
DPRINTF(Drain, "MinorCPU not finished draining\n");
return DrainState::Draining;
}
}
void
MinorCPU::signalDrainDone()
{
DPRINTF(Drain, "MinorCPU drain done\n");
Drainable::signalDrainDone();
}
void
MinorCPU::drainResume()
{
/* When taking over from another cpu make sure lastStopped
* is reset since it might have not been defined previously
* and might lead to a stats corruption */
pipeline->resetLastStopped();
if (switchedOut()) {
DPRINTF(Drain, "drainResume while switched out. Ignoring\n");
return;
}
DPRINTF(Drain, "MinorCPU drainResume\n");
if (!system->isTimingMode()) {
fatal("The Minor CPU requires the memory system to be in "
"'timing' mode.\n");
}
for (ThreadID tid = 0; tid < numThreads; tid++){
wakeup(tid);
}
pipeline->drainResume();
// Reschedule any power gating event (if any)
schedulePowerGatingEvent();
}
void
MinorCPU::memWriteback()
{
DPRINTF(Drain, "MinorCPU memWriteback\n");
}
void
MinorCPU::switchOut()
{
DPRINTF(MinorCPU, "MinorCPU switchOut\n");
assert(!switchedOut());
BaseCPU::switchOut();
/* Check that the CPU is drained? */
activityRecorder->reset();
}
void
MinorCPU::takeOverFrom(BaseCPU *old_cpu)
{
DPRINTF(MinorCPU, "MinorCPU takeOverFrom\n");
BaseCPU::takeOverFrom(old_cpu);
}
void
MinorCPU::activateContext(ThreadID thread_id)
{
DPRINTF(MinorCPU, "ActivateContext thread: %d\n", thread_id);
/* Do some cycle accounting. lastStopped is reset to stop the
* wakeup call on the pipeline from adding the quiesce period
* to BaseCPU::numCycles */
stats.quiesceCycles += pipeline->cyclesSinceLastStopped();
pipeline->resetLastStopped();
/* Wake up the thread, wakeup the pipeline tick */
threads[thread_id]->activate();
wakeupOnEvent(Minor::Pipeline::CPUStageId);
pipeline->wakeupFetch(thread_id);
BaseCPU::activateContext(thread_id);
}
void
MinorCPU::suspendContext(ThreadID thread_id)
{
DPRINTF(MinorCPU, "SuspendContext %d\n", thread_id);
threads[thread_id]->suspend();
BaseCPU::suspendContext(thread_id);
}
void
MinorCPU::wakeupOnEvent(unsigned int stage_id)
{
DPRINTF(Quiesce, "Event wakeup from stage %d\n", stage_id);
/* Mark that some activity has taken place and start the pipeline */
activityRecorder->activateStage(stage_id);
pipeline->start();
}
MinorCPU *
MinorCPUParams::create()
{
return new MinorCPU(this);
}
Port &
MinorCPU::getInstPort()
{
return pipeline->getInstPort();
}
Port &
MinorCPU::getDataPort()
{
return pipeline->getDataPort();
}
Counter
MinorCPU::totalInsts() const
{
Counter ret = 0;
for (auto i = threads.begin(); i != threads.end(); i ++)
ret += (*i)->numInst;
return ret;
}
Counter
MinorCPU::totalOps() const
{
Counter ret = 0;
for (auto i = threads.begin(); i != threads.end(); i ++)
ret += (*i)->numOp;
return ret;
}