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gem5 / public / gem5 / 65dbb3c69aff5bca9c4df0dee2a6b01af3eae5d2 / . / src / cpu / o3 / cpu.cc
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/*
* Copyright (c) 2011-2012, 2014, 2016, 2017, 2019 ARM Limited
* Copyright (c) 2013 Advanced Micro Devices, Inc.
* 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) 2004-2006 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
* (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/o3/cpu.hh"
#include "arch/generic/traits.hh"
#include "arch/kernel_stats.hh"
#include "config/the_isa.hh"
#include "cpu/activity.hh"
#include "cpu/checker/cpu.hh"
#include "cpu/checker/thread_context.hh"
#include "cpu/o3/isa_specific.hh"
#include "cpu/o3/thread_context.hh"
#include "cpu/quiesce_event.hh"
#include "cpu/simple_thread.hh"
#include "cpu/thread_context.hh"
#include "debug/Activity.hh"
#include "debug/Drain.hh"
#include "debug/O3CPU.hh"
#include "debug/Quiesce.hh"
#include "enums/MemoryMode.hh"
#include "sim/core.hh"
#include "sim/full_system.hh"
#include "sim/process.hh"
#include "sim/stat_control.hh"
#include "sim/system.hh"
struct BaseCPUParams;
using namespace TheISA;
using namespace std;
BaseO3CPU::BaseO3CPU(BaseCPUParams *params)
: BaseCPU(params)
{
}
void
BaseO3CPU::regStats()
{
BaseCPU::regStats();
}
template <class Impl>
FullO3CPU<Impl>::FullO3CPU(DerivO3CPUParams *params)
: BaseO3CPU(params),
itb(params->itb),
dtb(params->dtb),
tickEvent([this]{ tick(); }, "FullO3CPU tick",
false, Event::CPU_Tick_Pri),
threadExitEvent([this]{ exitThreads(); }, "FullO3CPU exit threads",
false, Event::CPU_Exit_Pri),
#ifndef NDEBUG
instcount(0),
#endif
removeInstsThisCycle(false),
fetch(this, params),
decode(this, params),
rename(this, params),
iew(this, params),
commit(this, params),
/* It is mandatory that all SMT threads use the same renaming mode as
* they are sharing registers and rename */
vecMode(RenameMode<TheISA::ISA>::init(params->isa[0])),
regFile(params->numPhysIntRegs,
params->numPhysFloatRegs,
params->numPhysVecRegs,
params->numPhysVecPredRegs,
params->numPhysCCRegs,
vecMode),
freeList(name() + ".freelist", &regFile),
rob(this, params),
scoreboard(name() + ".scoreboard",
regFile.totalNumPhysRegs()),
isa(numThreads, NULL),
timeBuffer(params->backComSize, params->forwardComSize),
fetchQueue(params->backComSize, params->forwardComSize),
decodeQueue(params->backComSize, params->forwardComSize),
renameQueue(params->backComSize, params->forwardComSize),
iewQueue(params->backComSize, params->forwardComSize),
activityRec(name(), NumStages,
params->backComSize + params->forwardComSize,
params->activity),
globalSeqNum(1),
system(params->system),
lastRunningCycle(curCycle())
{
if (!params->switched_out) {
_status = Running;
} else {
_status = SwitchedOut;
}
if (params->checker) {
BaseCPU *temp_checker = params->checker;
checker = dynamic_cast<Checker<Impl> *>(temp_checker);
checker->setIcachePort(&this->fetch.getInstPort());
checker->setSystem(params->system);
} else {
checker = NULL;
}
if (!FullSystem) {
thread.resize(numThreads);
tids.resize(numThreads);
}
// The stages also need their CPU pointer setup. However this
// must be done at the upper level CPU because they have pointers
// to the upper level CPU, and not this FullO3CPU.
// Set up Pointers to the activeThreads list for each stage
fetch.setActiveThreads(&activeThreads);
decode.setActiveThreads(&activeThreads);
rename.setActiveThreads(&activeThreads);
iew.setActiveThreads(&activeThreads);
commit.setActiveThreads(&activeThreads);
// Give each of the stages the time buffer they will use.
fetch.setTimeBuffer(&timeBuffer);
decode.setTimeBuffer(&timeBuffer);
rename.setTimeBuffer(&timeBuffer);
iew.setTimeBuffer(&timeBuffer);
commit.setTimeBuffer(&timeBuffer);
// Also setup each of the stages' queues.
fetch.setFetchQueue(&fetchQueue);
decode.setFetchQueue(&fetchQueue);
commit.setFetchQueue(&fetchQueue);
decode.setDecodeQueue(&decodeQueue);
rename.setDecodeQueue(&decodeQueue);
rename.setRenameQueue(&renameQueue);
iew.setRenameQueue(&renameQueue);
iew.setIEWQueue(&iewQueue);
commit.setIEWQueue(&iewQueue);
commit.setRenameQueue(&renameQueue);
commit.setIEWStage(&iew);
rename.setIEWStage(&iew);
rename.setCommitStage(&commit);
ThreadID active_threads;
if (FullSystem) {
active_threads = 1;
} else {
active_threads = params->workload.size();
if (active_threads > Impl::MaxThreads) {
panic("Workload Size too large. Increase the 'MaxThreads' "
"constant in your O3CPU impl. file (e.g. o3/alpha/impl.hh) "
"or edit your workload size.");
}
}
//Make Sure That this a Valid Architeture
assert(params->numPhysIntRegs >= numThreads * TheISA::NumIntRegs);
assert(params->numPhysFloatRegs >= numThreads * TheISA::NumFloatRegs);
assert(params->numPhysVecRegs >= numThreads * TheISA::NumVecRegs);
assert(params->numPhysVecPredRegs >= numThreads * TheISA::NumVecPredRegs);
assert(params->numPhysCCRegs >= numThreads * TheISA::NumCCRegs);
rename.setScoreboard(&scoreboard);
iew.setScoreboard(&scoreboard);
// Setup the rename map for whichever stages need it.
for (ThreadID tid = 0; tid < numThreads; tid++) {
isa[tid] = dynamic_cast<TheISA::ISA *>(params->isa[tid]);
assert(isa[tid]);
assert(RenameMode<TheISA::ISA>::equalsInit(isa[tid], isa[0]));
// Only Alpha has an FP zero register, so for other ISAs we
// use an invalid FP register index to avoid special treatment
// of any valid FP reg.
RegIndex invalidFPReg = TheISA::NumFloatRegs + 1;
commitRenameMap[tid].init(&regFile, TheISA::ZeroReg, invalidFPReg,
&freeList, vecMode);
renameMap[tid].init(&regFile, TheISA::ZeroReg, invalidFPReg,
&freeList, vecMode);
}
// Initialize rename map to assign physical registers to the
// architectural registers for active threads only.
for (ThreadID tid = 0; tid < active_threads; tid++) {
for (RegIndex ridx = 0; ridx < TheISA::NumIntRegs; ++ridx) {
// Note that we can't use the rename() method because we don't
// want special treatment for the zero register at this point
PhysRegIdPtr phys_reg = freeList.getIntReg();
renameMap[tid].setEntry(RegId(IntRegClass, ridx), phys_reg);
commitRenameMap[tid].setEntry(RegId(IntRegClass, ridx), phys_reg);
}
for (RegIndex ridx = 0; ridx < TheISA::NumFloatRegs; ++ridx) {
PhysRegIdPtr phys_reg = freeList.getFloatReg();
renameMap[tid].setEntry(RegId(FloatRegClass, ridx), phys_reg);
commitRenameMap[tid].setEntry(
RegId(FloatRegClass, ridx), phys_reg);
}
/* Here we need two 'interfaces' the 'whole register' and the
* 'register element'. At any point only one of them will be
* active. */
if (vecMode == Enums::Full) {
/* Initialize the full-vector interface */
for (RegIndex ridx = 0; ridx < TheISA::NumVecRegs; ++ridx) {
RegId rid = RegId(VecRegClass, ridx);
PhysRegIdPtr phys_reg = freeList.getVecReg();
renameMap[tid].setEntry(rid, phys_reg);
commitRenameMap[tid].setEntry(rid, phys_reg);
}
} else {
/* Initialize the vector-element interface */
for (RegIndex ridx = 0; ridx < TheISA::NumVecRegs; ++ridx) {
for (ElemIndex ldx = 0; ldx < TheISA::NumVecElemPerVecReg;
++ldx) {
RegId lrid = RegId(VecElemClass, ridx, ldx);
PhysRegIdPtr phys_elem = freeList.getVecElem();
renameMap[tid].setEntry(lrid, phys_elem);
commitRenameMap[tid].setEntry(lrid, phys_elem);
}
}
}
for (RegIndex ridx = 0; ridx < TheISA::NumVecPredRegs; ++ridx) {
PhysRegIdPtr phys_reg = freeList.getVecPredReg();
renameMap[tid].setEntry(RegId(VecPredRegClass, ridx), phys_reg);
commitRenameMap[tid].setEntry(
RegId(VecPredRegClass, ridx), phys_reg);
}
for (RegIndex ridx = 0; ridx < TheISA::NumCCRegs; ++ridx) {
PhysRegIdPtr phys_reg = freeList.getCCReg();
renameMap[tid].setEntry(RegId(CCRegClass, ridx), phys_reg);
commitRenameMap[tid].setEntry(RegId(CCRegClass, ridx), phys_reg);
}
}
rename.setRenameMap(renameMap);
commit.setRenameMap(commitRenameMap);
rename.setFreeList(&freeList);
// Setup the ROB for whichever stages need it.
commit.setROB(&rob);
lastActivatedCycle = 0;
DPRINTF(O3CPU, "Creating O3CPU object.\n");
// Setup any thread state.
this->thread.resize(this->numThreads);
for (ThreadID tid = 0; tid < this->numThreads; ++tid) {
if (FullSystem) {
// SMT is not supported in FS mode yet.
assert(this->numThreads == 1);
this->thread[tid] = new Thread(this, 0, NULL);
} else {
if (tid < params->workload.size()) {
DPRINTF(O3CPU, "Workload[%i] process is %#x",
tid, this->thread[tid]);
this->thread[tid] = new typename FullO3CPU<Impl>::Thread(
(typename Impl::O3CPU *)(this),
tid, params->workload[tid]);
//usedTids[tid] = true;
//threadMap[tid] = tid;
} else {
//Allocate Empty thread so M5 can use later
//when scheduling threads to CPU
Process* dummy_proc = NULL;
this->thread[tid] = new typename FullO3CPU<Impl>::Thread(
(typename Impl::O3CPU *)(this),
tid, dummy_proc);
//usedTids[tid] = false;
}
}
ThreadContext *tc;
// Setup the TC that will serve as the interface to the threads/CPU.
O3ThreadContext<Impl> *o3_tc = new O3ThreadContext<Impl>;
tc = o3_tc;
// If we're using a checker, then the TC should be the
// CheckerThreadContext.
if (params->checker) {
tc = new CheckerThreadContext<O3ThreadContext<Impl> >(
o3_tc, this->checker);
}
o3_tc->cpu = (typename Impl::O3CPU *)(this);
assert(o3_tc->cpu);
o3_tc->thread = this->thread[tid];
// Setup quiesce event.
this->thread[tid]->quiesceEvent = new EndQuiesceEvent(tc);
// Give the thread the TC.
this->thread[tid]->tc = tc;
// Add the TC to the CPU's list of TC's.
this->threadContexts.push_back(tc);
}
// FullO3CPU always requires an interrupt controller.
if (!params->switched_out && interrupts.empty()) {
fatal("FullO3CPU %s has no interrupt controller.\n"
"Ensure createInterruptController() is called.\n", name());
}
for (ThreadID tid = 0; tid < this->numThreads; tid++)
this->thread[tid]->setFuncExeInst(0);
}
template <class Impl>
FullO3CPU<Impl>::~FullO3CPU()
{
}
template <class Impl>
void
FullO3CPU<Impl>::regProbePoints()
{
BaseCPU::regProbePoints();
ppInstAccessComplete = new ProbePointArg<PacketPtr>(getProbeManager(), "InstAccessComplete");
ppDataAccessComplete = new ProbePointArg<std::pair<DynInstPtr, PacketPtr> >(getProbeManager(), "DataAccessComplete");
fetch.regProbePoints();
rename.regProbePoints();
iew.regProbePoints();
commit.regProbePoints();
}
template <class Impl>
void
FullO3CPU<Impl>::regStats()
{
BaseO3CPU::regStats();
// Register any of the O3CPU's stats here.
timesIdled
.name(name() + ".timesIdled")
.desc("Number of times that the entire CPU went into an idle state and"
" unscheduled itself")
.prereq(timesIdled);
idleCycles
.name(name() + ".idleCycles")
.desc("Total number of cycles that the CPU has spent unscheduled due "
"to idling")
.prereq(idleCycles);
quiesceCycles
.name(name() + ".quiesceCycles")
.desc("Total number of cycles that CPU has spent quiesced or waiting "
"for an interrupt")
.prereq(quiesceCycles);
// Number of Instructions simulated
// --------------------------------
// Should probably be in Base CPU but need templated
// MaxThreads so put in here instead
committedInsts
.init(numThreads)
.name(name() + ".committedInsts")
.desc("Number of Instructions Simulated")
.flags(Stats::total);
committedOps
.init(numThreads)
.name(name() + ".committedOps")
.desc("Number of Ops (including micro ops) Simulated")
.flags(Stats::total);
cpi
.name(name() + ".cpi")
.desc("CPI: Cycles Per Instruction")
.precision(6);
cpi = numCycles / committedInsts;
totalCpi
.name(name() + ".cpi_total")
.desc("CPI: Total CPI of All Threads")
.precision(6);
totalCpi = numCycles / sum(committedInsts);
ipc
.name(name() + ".ipc")
.desc("IPC: Instructions Per Cycle")
.precision(6);
ipc = committedInsts / numCycles;
totalIpc
.name(name() + ".ipc_total")
.desc("IPC: Total IPC of All Threads")
.precision(6);
totalIpc = sum(committedInsts) / numCycles;
this->fetch.regStats();
this->decode.regStats();
this->rename.regStats();
this->iew.regStats();
this->commit.regStats();
this->rob.regStats();
intRegfileReads
.name(name() + ".int_regfile_reads")
.desc("number of integer regfile reads")
.prereq(intRegfileReads);
intRegfileWrites
.name(name() + ".int_regfile_writes")
.desc("number of integer regfile writes")
.prereq(intRegfileWrites);
fpRegfileReads
.name(name() + ".fp_regfile_reads")
.desc("number of floating regfile reads")
.prereq(fpRegfileReads);
fpRegfileWrites
.name(name() + ".fp_regfile_writes")
.desc("number of floating regfile writes")
.prereq(fpRegfileWrites);
vecRegfileReads
.name(name() + ".vec_regfile_reads")
.desc("number of vector regfile reads")
.prereq(vecRegfileReads);
vecRegfileWrites
.name(name() + ".vec_regfile_writes")
.desc("number of vector regfile writes")
.prereq(vecRegfileWrites);
vecPredRegfileReads
.name(name() + ".pred_regfile_reads")
.desc("number of predicate regfile reads")
.prereq(vecPredRegfileReads);
vecPredRegfileWrites
.name(name() + ".pred_regfile_writes")
.desc("number of predicate regfile writes")
.prereq(vecPredRegfileWrites);
ccRegfileReads
.name(name() + ".cc_regfile_reads")
.desc("number of cc regfile reads")
.prereq(ccRegfileReads);
ccRegfileWrites
.name(name() + ".cc_regfile_writes")
.desc("number of cc regfile writes")
.prereq(ccRegfileWrites);
miscRegfileReads
.name(name() + ".misc_regfile_reads")
.desc("number of misc regfile reads")
.prereq(miscRegfileReads);
miscRegfileWrites
.name(name() + ".misc_regfile_writes")
.desc("number of misc regfile writes")
.prereq(miscRegfileWrites);
}
template <class Impl>
void
FullO3CPU<Impl>::tick()
{
DPRINTF(O3CPU, "\n\nFullO3CPU: Ticking main, FullO3CPU.\n");
assert(!switchedOut());
assert(drainState() != DrainState::Drained);
++numCycles;
updateCycleCounters(BaseCPU::CPU_STATE_ON);
// activity = false;
//Tick each of the stages
fetch.tick();
decode.tick();
rename.tick();
iew.tick();
commit.tick();
// Now advance the time buffers
timeBuffer.advance();
fetchQueue.advance();
decodeQueue.advance();
renameQueue.advance();
iewQueue.advance();
activityRec.advance();
if (removeInstsThisCycle) {
cleanUpRemovedInsts();
}
if (!tickEvent.scheduled()) {
if (_status == SwitchedOut) {
DPRINTF(O3CPU, "Switched out!\n");
// increment stat
lastRunningCycle = curCycle();
} else if (!activityRec.active() || _status == Idle) {
DPRINTF(O3CPU, "Idle!\n");
lastRunningCycle = curCycle();
timesIdled++;
} else {
schedule(tickEvent, clockEdge(Cycles(1)));
DPRINTF(O3CPU, "Scheduling next tick!\n");
}
}
if (!FullSystem)
updateThreadPriority();
tryDrain();
}
template <class Impl>
void
FullO3CPU<Impl>::init()
{
BaseCPU::init();
for (ThreadID tid = 0; tid < numThreads; ++tid) {
// Set noSquashFromTC so that the CPU doesn't squash when initially
// setting up registers.
thread[tid]->noSquashFromTC = true;
// Initialise the ThreadContext's memory proxies
thread[tid]->initMemProxies(thread[tid]->getTC());
}
// Clear noSquashFromTC.
for (int tid = 0; tid < numThreads; ++tid)
thread[tid]->noSquashFromTC = false;
commit.setThreads(thread);
}
template <class Impl>
void
FullO3CPU<Impl>::startup()
{
BaseCPU::startup();
for (int tid = 0; tid < numThreads; ++tid)
isa[tid]->startup(threadContexts[tid]);
fetch.startupStage();
decode.startupStage();
iew.startupStage();
rename.startupStage();
commit.startupStage();
}
template <class Impl>
void
FullO3CPU<Impl>::activateThread(ThreadID tid)
{
list<ThreadID>::iterator isActive =
std::find(activeThreads.begin(), activeThreads.end(), tid);
DPRINTF(O3CPU, "[tid:%i] Calling activate thread.\n", tid);
assert(!switchedOut());
if (isActive == activeThreads.end()) {
DPRINTF(O3CPU, "[tid:%i] Adding to active threads list\n",
tid);
activeThreads.push_back(tid);
}
}
template <class Impl>
void
FullO3CPU<Impl>::deactivateThread(ThreadID tid)
{
//Remove From Active List, if Active
list<ThreadID>::iterator thread_it =
std::find(activeThreads.begin(), activeThreads.end(), tid);
DPRINTF(O3CPU, "[tid:%i] Calling deactivate thread.\n", tid);
assert(!switchedOut());
if (thread_it != activeThreads.end()) {
DPRINTF(O3CPU,"[tid:%i] Removing from active threads list\n",
tid);
activeThreads.erase(thread_it);
}
fetch.deactivateThread(tid);
commit.deactivateThread(tid);
}
template <class Impl>
Counter
FullO3CPU<Impl>::totalInsts() const
{
Counter total(0);
ThreadID size = thread.size();
for (ThreadID i = 0; i < size; i++)
total += thread[i]->numInst;
return total;
}
template <class Impl>
Counter
FullO3CPU<Impl>::totalOps() const
{
Counter total(0);
ThreadID size = thread.size();
for (ThreadID i = 0; i < size; i++)
total += thread[i]->numOp;
return total;
}
template <class Impl>
void
FullO3CPU<Impl>::activateContext(ThreadID tid)
{
assert(!switchedOut());
// Needs to set each stage to running as well.
activateThread(tid);
// We don't want to wake the CPU if it is drained. In that case,
// we just want to flag the thread as active and schedule the tick
// event from drainResume() instead.
if (drainState() == DrainState::Drained)
return;
// If we are time 0 or if the last activation time is in the past,
// schedule the next tick and wake up the fetch unit
if (lastActivatedCycle == 0 || lastActivatedCycle < curTick()) {
scheduleTickEvent(Cycles(0));
// Be sure to signal that there's some activity so the CPU doesn't
// deschedule itself.
activityRec.activity();
fetch.wakeFromQuiesce();
Cycles cycles(curCycle() - lastRunningCycle);
// @todo: This is an oddity that is only here to match the stats
if (cycles != 0)
--cycles;
quiesceCycles += cycles;
lastActivatedCycle = curTick();
_status = Running;
BaseCPU::activateContext(tid);
}
}
template <class Impl>
void
FullO3CPU<Impl>::suspendContext(ThreadID tid)
{
DPRINTF(O3CPU,"[tid:%i] Suspending Thread Context.\n", tid);
assert(!switchedOut());
deactivateThread(tid);
// If this was the last thread then unschedule the tick event.
if (activeThreads.size() == 0) {
unscheduleTickEvent();
lastRunningCycle = curCycle();
_status = Idle;
}
DPRINTF(Quiesce, "Suspending Context\n");
BaseCPU::suspendContext(tid);
}
template <class Impl>
void
FullO3CPU<Impl>::haltContext(ThreadID tid)
{
//For now, this is the same as deallocate
DPRINTF(O3CPU,"[tid:%i] Halt Context called. Deallocating\n", tid);
assert(!switchedOut());
deactivateThread(tid);
removeThread(tid);
updateCycleCounters(BaseCPU::CPU_STATE_SLEEP);
}
template <class Impl>
void
FullO3CPU<Impl>::insertThread(ThreadID tid)
{
DPRINTF(O3CPU,"[tid:%i] Initializing thread into CPU");
// Will change now that the PC and thread state is internal to the CPU
// and not in the ThreadContext.
ThreadContext *src_tc;
if (FullSystem)
src_tc = system->threadContexts[tid];
else
src_tc = tcBase(tid);
//Bind Int Regs to Rename Map
for (RegId reg_id(IntRegClass, 0); reg_id.index() < TheISA::NumIntRegs;
reg_id.index()++) {
PhysRegIdPtr phys_reg = freeList.getIntReg();
renameMap[tid].setEntry(reg_id, phys_reg);
scoreboard.setReg(phys_reg);
}
//Bind Float Regs to Rename Map
for (RegId reg_id(FloatRegClass, 0); reg_id.index() < TheISA::NumFloatRegs;
reg_id.index()++) {
PhysRegIdPtr phys_reg = freeList.getFloatReg();
renameMap[tid].setEntry(reg_id, phys_reg);
scoreboard.setReg(phys_reg);
}
//Bind condition-code Regs to Rename Map
for (RegId reg_id(CCRegClass, 0); reg_id.index() < TheISA::NumCCRegs;
reg_id.index()++) {
PhysRegIdPtr phys_reg = freeList.getCCReg();
renameMap[tid].setEntry(reg_id, phys_reg);
scoreboard.setReg(phys_reg);
}
//Copy Thread Data Into RegFile
//this->copyFromTC(tid);
//Set PC/NPC/NNPC
pcState(src_tc->pcState(), tid);
src_tc->setStatus(ThreadContext::Active);
activateContext(tid);
//Reset ROB/IQ/LSQ Entries
commit.rob->resetEntries();
}
template <class Impl>
void
FullO3CPU<Impl>::removeThread(ThreadID tid)
{
DPRINTF(O3CPU,"[tid:%i] Removing thread context from CPU.\n", tid);
// Copy Thread Data From RegFile
// If thread is suspended, it might be re-allocated
// this->copyToTC(tid);
// @todo: 2-27-2008: Fix how we free up rename mappings
// here to alleviate the case for double-freeing registers
// in SMT workloads.
// clear all thread-specific states in each stage of the pipeline
// since this thread is going to be completely removed from the CPU
commit.clearStates(tid);
fetch.clearStates(tid);
decode.clearStates(tid);
rename.clearStates(tid);
iew.clearStates(tid);
// at this step, all instructions in the pipeline should be already
// either committed successfully or squashed. All thread-specific
// queues in the pipeline must be empty.
assert(iew.instQueue.getCount(tid) == 0);
assert(iew.ldstQueue.getCount(tid) == 0);
assert(commit.rob->isEmpty(tid));
// Reset ROB/IQ/LSQ Entries
// Commented out for now. This should be possible to do by
// telling all the pipeline stages to drain first, and then
// checking until the drain completes. Once the pipeline is
// drained, call resetEntries(). - 10-09-06 ktlim
/*
if (activeThreads.size() >= 1) {
commit.rob->resetEntries();
iew.resetEntries();
}
*/
}
template <class Impl>
void
FullO3CPU<Impl>::setVectorsAsReady(ThreadID tid)
{
if (vecMode == Enums::Elem) {
for (auto v = 0; v < TheISA::NumVecRegs; v++)
for (auto e = 0; e < TheISA::NumVecElemPerVecReg; e++)
scoreboard.setReg(
commitRenameMap[tid].lookup(
RegId(VecElemClass, v, e)
)
);
} else if (vecMode == Enums::Full) {
for (auto v = 0; v < TheISA::NumVecRegs; v++)
scoreboard.setReg(
commitRenameMap[tid].lookup(
RegId(VecRegClass, v)
)
);
}
}
template <class Impl>
void
FullO3CPU<Impl>::switchRenameMode(ThreadID tid, UnifiedFreeList* freelist)
{
auto pc = this->pcState(tid);
// new_mode is the new vector renaming mode
auto new_mode = RenameMode<TheISA::ISA>::mode(pc);
// We update vecMode only if there has been a change
if (new_mode != vecMode) {
vecMode = new_mode;
renameMap[tid].switchMode(vecMode);
commitRenameMap[tid].switchMode(vecMode);
renameMap[tid].switchFreeList(freelist);
setVectorsAsReady(tid);
}
}
template <class Impl>
Fault
FullO3CPU<Impl>::getInterrupts()
{
// Check if there are any outstanding interrupts
return this->interrupts[0]->getInterrupt(this->threadContexts[0]);
}
template <class Impl>
void
FullO3CPU<Impl>::processInterrupts(const Fault &interrupt)
{
// Check for interrupts here. For now can copy the code that
// exists within isa_fullsys_traits.hh. Also assume that thread 0
// is the one that handles the interrupts.
// @todo: Possibly consolidate the interrupt checking code.
// @todo: Allow other threads to handle interrupts.
assert(interrupt != NoFault);
this->interrupts[0]->updateIntrInfo(this->threadContexts[0]);
DPRINTF(O3CPU, "Interrupt %s being handled\n", interrupt->name());
this->trap(interrupt, 0, nullptr);
}
template <class Impl>
void
FullO3CPU<Impl>::trap(const Fault &fault, ThreadID tid,
const StaticInstPtr &inst)
{
// Pass the thread's TC into the invoke method.
fault->invoke(this->threadContexts[tid], inst);
}
template <class Impl>
void
FullO3CPU<Impl>::syscall(ThreadID tid, Fault *fault)
{
DPRINTF(O3CPU, "[tid:%i] Executing syscall().\n\n", tid);
DPRINTF(Activity,"Activity: syscall() called.\n");
// Temporarily increase this by one to account for the syscall
// instruction.
++(this->thread[tid]->funcExeInst);
// Execute the actual syscall.
this->thread[tid]->syscall(fault);
// Decrease funcExeInst by one as the normal commit will handle
// incrementing it.
--(this->thread[tid]->funcExeInst);
}
template <class Impl>
void
FullO3CPU<Impl>::serializeThread(CheckpointOut &cp, ThreadID tid) const
{
thread[tid]->serialize(cp);
}
template <class Impl>
void
FullO3CPU<Impl>::unserializeThread(CheckpointIn &cp, ThreadID tid)
{
thread[tid]->unserialize(cp);
}
template <class Impl>
DrainState
FullO3CPU<Impl>::drain()
{
// Deschedule any power gating event (if any)
deschedulePowerGatingEvent();
// If the CPU isn't doing anything, then return immediately.
if (switchedOut())
return DrainState::Drained;
DPRINTF(Drain, "Draining...\n");
// We only need to signal a drain to the commit stage as this
// initiates squashing controls the draining. Once the commit
// stage commits an instruction where it is safe to stop, it'll
// squash the rest of the instructions in the pipeline and force
// the fetch stage to stall. The pipeline will be drained once all
// in-flight instructions have retired.
commit.drain();
// Wake the CPU and record activity so everything can drain out if
// the CPU was not able to immediately drain.
if (!isCpuDrained()) {
// If a thread is suspended, wake it up so it can be drained
for (auto t : threadContexts) {
if (t->status() == ThreadContext::Suspended){
DPRINTF(Drain, "Currently suspended so activate %i \n",
t->threadId());
t->activate();
// As the thread is now active, change the power state as well
activateContext(t->threadId());
}
}
wakeCPU();
activityRec.activity();
DPRINTF(Drain, "CPU not drained\n");
return DrainState::Draining;
} else {
DPRINTF(Drain, "CPU is already drained\n");
if (tickEvent.scheduled())
deschedule(tickEvent);
// Flush out any old data from the time buffers. In
// particular, there might be some data in flight from the
// fetch stage that isn't visible in any of the CPU buffers we
// test in isCpuDrained().
for (int i = 0; i < timeBuffer.getSize(); ++i) {
timeBuffer.advance();
fetchQueue.advance();
decodeQueue.advance();
renameQueue.advance();
iewQueue.advance();
}
drainSanityCheck();
return DrainState::Drained;
}
}
template <class Impl>
bool
FullO3CPU<Impl>::tryDrain()
{
if (drainState() != DrainState::Draining || !isCpuDrained())
return false;
if (tickEvent.scheduled())
deschedule(tickEvent);
DPRINTF(Drain, "CPU done draining, processing drain event\n");
signalDrainDone();
return true;
}
template <class Impl>
void
FullO3CPU<Impl>::drainSanityCheck() const
{
assert(isCpuDrained());
fetch.drainSanityCheck();
decode.drainSanityCheck();
rename.drainSanityCheck();
iew.drainSanityCheck();
commit.drainSanityCheck();
}
template <class Impl>
bool
FullO3CPU<Impl>::isCpuDrained() const
{
bool drained(true);
if (!instList.empty() || !removeList.empty()) {
DPRINTF(Drain, "Main CPU structures not drained.\n");
drained = false;
}
if (!fetch.isDrained()) {
DPRINTF(Drain, "Fetch not drained.\n");
drained = false;
}
if (!decode.isDrained()) {
DPRINTF(Drain, "Decode not drained.\n");
drained = false;
}
if (!rename.isDrained()) {
DPRINTF(Drain, "Rename not drained.\n");
drained = false;
}
if (!iew.isDrained()) {
DPRINTF(Drain, "IEW not drained.\n");
drained = false;
}
if (!commit.isDrained()) {
DPRINTF(Drain, "Commit not drained.\n");
drained = false;
}
return drained;
}
template <class Impl>
void
FullO3CPU<Impl>::commitDrained(ThreadID tid)
{
fetch.drainStall(tid);
}
template <class Impl>
void
FullO3CPU<Impl>::drainResume()
{
if (switchedOut())
return;
DPRINTF(Drain, "Resuming...\n");
verifyMemoryMode();
fetch.drainResume();
commit.drainResume();
_status = Idle;
for (ThreadID i = 0; i < thread.size(); i++) {
if (thread[i]->status() == ThreadContext::Active) {
DPRINTF(Drain, "Activating thread: %i\n", i);
activateThread(i);
_status = Running;
}
}
assert(!tickEvent.scheduled());
if (_status == Running)
schedule(tickEvent, nextCycle());
// Reschedule any power gating event (if any)
schedulePowerGatingEvent();
}
template <class Impl>
void
FullO3CPU<Impl>::switchOut()
{
DPRINTF(O3CPU, "Switching out\n");
BaseCPU::switchOut();
activityRec.reset();
_status = SwitchedOut;
if (checker)
checker->switchOut();
}
template <class Impl>
void
FullO3CPU<Impl>::takeOverFrom(BaseCPU *oldCPU)
{
BaseCPU::takeOverFrom(oldCPU);
fetch.takeOverFrom();
decode.takeOverFrom();
rename.takeOverFrom();
iew.takeOverFrom();
commit.takeOverFrom();
assert(!tickEvent.scheduled());
FullO3CPU<Impl> *oldO3CPU = dynamic_cast<FullO3CPU<Impl>*>(oldCPU);
if (oldO3CPU)
globalSeqNum = oldO3CPU->globalSeqNum;
lastRunningCycle = curCycle();
_status = Idle;
}
template <class Impl>
void
FullO3CPU<Impl>::verifyMemoryMode() const
{
if (!system->isTimingMode()) {
fatal("The O3 CPU requires the memory system to be in "
"'timing' mode.\n");
}
}
template <class Impl>
RegVal
FullO3CPU<Impl>::readMiscRegNoEffect(int misc_reg, ThreadID tid) const
{
return this->isa[tid]->readMiscRegNoEffect(misc_reg);
}
template <class Impl>
RegVal
FullO3CPU<Impl>::readMiscReg(int misc_reg, ThreadID tid)
{
miscRegfileReads++;
return this->isa[tid]->readMiscReg(misc_reg, tcBase(tid));
}
template <class Impl>
void
FullO3CPU<Impl>::setMiscRegNoEffect(int misc_reg, RegVal val, ThreadID tid)
{
this->isa[tid]->setMiscRegNoEffect(misc_reg, val);
}
template <class Impl>
void
FullO3CPU<Impl>::setMiscReg(int misc_reg, RegVal val, ThreadID tid)
{
miscRegfileWrites++;
this->isa[tid]->setMiscReg(misc_reg, val, tcBase(tid));
}
template <class Impl>
RegVal
FullO3CPU<Impl>::readIntReg(PhysRegIdPtr phys_reg)
{
intRegfileReads++;
return regFile.readIntReg(phys_reg);
}
template <class Impl>
RegVal
FullO3CPU<Impl>::readFloatReg(PhysRegIdPtr phys_reg)
{
fpRegfileReads++;
return regFile.readFloatReg(phys_reg);
}
template <class Impl>
auto
FullO3CPU<Impl>::readVecReg(PhysRegIdPtr phys_reg) const
-> const VecRegContainer&
{
vecRegfileReads++;
return regFile.readVecReg(phys_reg);
}
template <class Impl>
auto
FullO3CPU<Impl>::getWritableVecReg(PhysRegIdPtr phys_reg)
-> VecRegContainer&
{
vecRegfileWrites++;
return regFile.getWritableVecReg(phys_reg);
}
template <class Impl>
auto
FullO3CPU<Impl>::readVecElem(PhysRegIdPtr phys_reg) const -> const VecElem&
{
vecRegfileReads++;
return regFile.readVecElem(phys_reg);
}
template <class Impl>
auto
FullO3CPU<Impl>::readVecPredReg(PhysRegIdPtr phys_reg) const
-> const VecPredRegContainer&
{
vecPredRegfileReads++;
return regFile.readVecPredReg(phys_reg);
}
template <class Impl>
auto
FullO3CPU<Impl>::getWritableVecPredReg(PhysRegIdPtr phys_reg)
-> VecPredRegContainer&
{
vecPredRegfileWrites++;
return regFile.getWritableVecPredReg(phys_reg);
}
template <class Impl>
RegVal
FullO3CPU<Impl>::readCCReg(PhysRegIdPtr phys_reg)
{
ccRegfileReads++;
return regFile.readCCReg(phys_reg);
}
template <class Impl>
void
FullO3CPU<Impl>::setIntReg(PhysRegIdPtr phys_reg, RegVal val)
{
intRegfileWrites++;
regFile.setIntReg(phys_reg, val);
}
template <class Impl>
void
FullO3CPU<Impl>::setFloatReg(PhysRegIdPtr phys_reg, RegVal val)
{
fpRegfileWrites++;
regFile.setFloatReg(phys_reg, val);
}
template <class Impl>
void
FullO3CPU<Impl>::setVecReg(PhysRegIdPtr phys_reg, const VecRegContainer& val)
{
vecRegfileWrites++;
regFile.setVecReg(phys_reg, val);
}
template <class Impl>
void
FullO3CPU<Impl>::setVecElem(PhysRegIdPtr phys_reg, const VecElem& val)
{
vecRegfileWrites++;
regFile.setVecElem(phys_reg, val);
}
template <class Impl>
void
FullO3CPU<Impl>::setVecPredReg(PhysRegIdPtr phys_reg,
const VecPredRegContainer& val)
{
vecPredRegfileWrites++;
regFile.setVecPredReg(phys_reg, val);
}
template <class Impl>
void
FullO3CPU<Impl>::setCCReg(PhysRegIdPtr phys_reg, RegVal val)
{
ccRegfileWrites++;
regFile.setCCReg(phys_reg, val);
}
template <class Impl>
RegVal
FullO3CPU<Impl>::readArchIntReg(int reg_idx, ThreadID tid)
{
intRegfileReads++;
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(IntRegClass, reg_idx));
return regFile.readIntReg(phys_reg);
}
template <class Impl>
RegVal
FullO3CPU<Impl>::readArchFloatReg(int reg_idx, ThreadID tid)
{
fpRegfileReads++;
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(FloatRegClass, reg_idx));
return regFile.readFloatReg(phys_reg);
}
template <class Impl>
auto
FullO3CPU<Impl>::readArchVecReg(int reg_idx, ThreadID tid) const
-> const VecRegContainer&
{
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(VecRegClass, reg_idx));
return readVecReg(phys_reg);
}
template <class Impl>
auto
FullO3CPU<Impl>::getWritableArchVecReg(int reg_idx, ThreadID tid)
-> VecRegContainer&
{
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(VecRegClass, reg_idx));
return getWritableVecReg(phys_reg);
}
template <class Impl>
auto
FullO3CPU<Impl>::readArchVecElem(const RegIndex& reg_idx, const ElemIndex& ldx,
ThreadID tid) const -> const VecElem&
{
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(VecElemClass, reg_idx, ldx));
return readVecElem(phys_reg);
}
template <class Impl>
auto
FullO3CPU<Impl>::readArchVecPredReg(int reg_idx, ThreadID tid) const
-> const VecPredRegContainer&
{
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(VecPredRegClass, reg_idx));
return readVecPredReg(phys_reg);
}
template <class Impl>
auto
FullO3CPU<Impl>::getWritableArchVecPredReg(int reg_idx, ThreadID tid)
-> VecPredRegContainer&
{
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(VecPredRegClass, reg_idx));
return getWritableVecPredReg(phys_reg);
}
template <class Impl>
RegVal
FullO3CPU<Impl>::readArchCCReg(int reg_idx, ThreadID tid)
{
ccRegfileReads++;
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(CCRegClass, reg_idx));
return regFile.readCCReg(phys_reg);
}
template <class Impl>
void
FullO3CPU<Impl>::setArchIntReg(int reg_idx, RegVal val, ThreadID tid)
{
intRegfileWrites++;
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(IntRegClass, reg_idx));
regFile.setIntReg(phys_reg, val);
}
template <class Impl>
void
FullO3CPU<Impl>::setArchFloatReg(int reg_idx, RegVal val, ThreadID tid)
{
fpRegfileWrites++;
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(FloatRegClass, reg_idx));
regFile.setFloatReg(phys_reg, val);
}
template <class Impl>
void
FullO3CPU<Impl>::setArchVecReg(int reg_idx, const VecRegContainer& val,
ThreadID tid)
{
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(VecRegClass, reg_idx));
setVecReg(phys_reg, val);
}
template <class Impl>
void
FullO3CPU<Impl>::setArchVecElem(const RegIndex& reg_idx, const ElemIndex& ldx,
const VecElem& val, ThreadID tid)
{
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(VecElemClass, reg_idx, ldx));
setVecElem(phys_reg, val);
}
template <class Impl>
void
FullO3CPU<Impl>::setArchVecPredReg(int reg_idx, const VecPredRegContainer& val,
ThreadID tid)
{
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(VecPredRegClass, reg_idx));
setVecPredReg(phys_reg, val);
}
template <class Impl>
void
FullO3CPU<Impl>::setArchCCReg(int reg_idx, RegVal val, ThreadID tid)
{
ccRegfileWrites++;
PhysRegIdPtr phys_reg = commitRenameMap[tid].lookup(
RegId(CCRegClass, reg_idx));
regFile.setCCReg(phys_reg, val);
}
template <class Impl>
TheISA::PCState
FullO3CPU<Impl>::pcState(ThreadID tid)
{
return commit.pcState(tid);
}
template <class Impl>
void
FullO3CPU<Impl>::pcState(const TheISA::PCState &val, ThreadID tid)
{
commit.pcState(val, tid);
}
template <class Impl>
Addr
FullO3CPU<Impl>::instAddr(ThreadID tid)
{
return commit.instAddr(tid);
}
template <class Impl>
Addr
FullO3CPU<Impl>::nextInstAddr(ThreadID tid)
{
return commit.nextInstAddr(tid);
}
template <class Impl>
MicroPC
FullO3CPU<Impl>::microPC(ThreadID tid)
{
return commit.microPC(tid);
}
template <class Impl>
void
FullO3CPU<Impl>::squashFromTC(ThreadID tid)
{
this->thread[tid]->noSquashFromTC = true;
this->commit.generateTCEvent(tid);
}
template <class Impl>
typename FullO3CPU<Impl>::ListIt
FullO3CPU<Impl>::addInst(const DynInstPtr &inst)
{
instList.push_back(inst);
return --(instList.end());
}
template <class Impl>
void
FullO3CPU<Impl>::instDone(ThreadID tid, const DynInstPtr &inst)
{
// Keep an instruction count.
if (!inst->isMicroop() || inst->isLastMicroop()) {
thread[tid]->numInst++;
thread[tid]->numInsts++;
committedInsts[tid]++;
system->totalNumInsts++;
// Check for instruction-count-based events.
thread[tid]->comInstEventQueue.serviceEvents(thread[tid]->numInst);
}
thread[tid]->numOp++;
thread[tid]->numOps++;
committedOps[tid]++;
probeInstCommit(inst->staticInst, inst->instAddr());
}
template <class Impl>
void
FullO3CPU<Impl>::removeFrontInst(const DynInstPtr &inst)
{
DPRINTF(O3CPU, "Removing committed instruction [tid:%i] PC %s "
"[sn:%lli]\n",
inst->threadNumber, inst->pcState(), inst->seqNum);
removeInstsThisCycle = true;
// Remove the front instruction.
removeList.push(inst->getInstListIt());
}
template <class Impl>
void
FullO3CPU<Impl>::removeInstsNotInROB(ThreadID tid)
{
DPRINTF(O3CPU, "Thread %i: Deleting instructions from instruction"
" list.\n", tid);
ListIt end_it;
bool rob_empty = false;
if (instList.empty()) {
return;
} else if (rob.isEmpty(tid)) {
DPRINTF(O3CPU, "ROB is empty, squashing all insts.\n");
end_it = instList.begin();
rob_empty = true;
} else {
end_it = (rob.readTailInst(tid))->getInstListIt();
DPRINTF(O3CPU, "ROB is not empty, squashing insts not in ROB.\n");
}
removeInstsThisCycle = true;
ListIt inst_it = instList.end();
inst_it--;
// Walk through the instruction list, removing any instructions
// that were inserted after the given instruction iterator, end_it.
while (inst_it != end_it) {
assert(!instList.empty());
squashInstIt(inst_it, tid);
inst_it--;
}
// If the ROB was empty, then we actually need to remove the first
// instruction as well.
if (rob_empty) {
squashInstIt(inst_it, tid);
}
}
template <class Impl>
void
FullO3CPU<Impl>::removeInstsUntil(const InstSeqNum &seq_num, ThreadID tid)
{
assert(!instList.empty());
removeInstsThisCycle = true;
ListIt inst_iter = instList.end();
inst_iter--;
DPRINTF(O3CPU, "Deleting instructions from instruction "
"list that are from [tid:%i] and above [sn:%lli] (end=%lli).\n",
tid, seq_num, (*inst_iter)->seqNum);
while ((*inst_iter)->seqNum > seq_num) {
bool break_loop = (inst_iter == instList.begin());
squashInstIt(inst_iter, tid);
inst_iter--;
if (break_loop)
break;
}
}
template <class Impl>
inline void
FullO3CPU<Impl>::squashInstIt(const ListIt &instIt, ThreadID tid)
{
if ((*instIt)->threadNumber == tid) {
DPRINTF(O3CPU, "Squashing instruction, "
"[tid:%i] [sn:%lli] PC %s\n",
(*instIt)->threadNumber,
(*instIt)->seqNum,
(*instIt)->pcState());
// Mark it as squashed.
(*instIt)->setSquashed();
// @todo: Formulate a consistent method for deleting
// instructions from the instruction list
// Remove the instruction from the list.
removeList.push(instIt);
}
}
template <class Impl>
void
FullO3CPU<Impl>::cleanUpRemovedInsts()
{
while (!removeList.empty()) {
DPRINTF(O3CPU, "Removing instruction, "
"[tid:%i] [sn:%lli] PC %s\n",
(*removeList.front())->threadNumber,
(*removeList.front())->seqNum,
(*removeList.front())->pcState());
instList.erase(removeList.front());
removeList.pop();
}
removeInstsThisCycle = false;
}
/*
template <class Impl>
void
FullO3CPU<Impl>::removeAllInsts()
{
instList.clear();
}
*/
template <class Impl>
void
FullO3CPU<Impl>::dumpInsts()
{
int num = 0;
ListIt inst_list_it = instList.begin();
cprintf("Dumping Instruction List\n");
while (inst_list_it != instList.end()) {
cprintf("Instruction:%i\nPC:%#x\n[tid:%i]\n[sn:%lli]\nIssued:%i\n"
"Squashed:%i\n\n",
num, (*inst_list_it)->instAddr(), (*inst_list_it)->threadNumber,
(*inst_list_it)->seqNum, (*inst_list_it)->isIssued(),
(*inst_list_it)->isSquashed());
inst_list_it++;
++num;
}
}
/*
template <class Impl>
void
FullO3CPU<Impl>::wakeDependents(const DynInstPtr &inst)
{
iew.wakeDependents(inst);
}
*/
template <class Impl>
void
FullO3CPU<Impl>::wakeCPU()
{
if (activityRec.active() || tickEvent.scheduled()) {
DPRINTF(Activity, "CPU already running.\n");
return;
}
DPRINTF(Activity, "Waking up CPU\n");
Cycles cycles(curCycle() - lastRunningCycle);
// @todo: This is an oddity that is only here to match the stats
if (cycles > 1) {
--cycles;
idleCycles += cycles;
numCycles += cycles;
}
schedule(tickEvent, clockEdge());
}
template <class Impl>
void
FullO3CPU<Impl>::wakeup(ThreadID tid)
{
if (this->thread[tid]->status() != ThreadContext::Suspended)
return;
this->wakeCPU();
DPRINTF(Quiesce, "Suspended Processor woken\n");
this->threadContexts[tid]->activate();
}
template <class Impl>
ThreadID
FullO3CPU<Impl>::getFreeTid()
{
for (ThreadID tid = 0; tid < numThreads; tid++) {
if (!tids[tid]) {
tids[tid] = true;
return tid;
}
}
return InvalidThreadID;
}
template <class Impl>
void
FullO3CPU<Impl>::updateThreadPriority()
{
if (activeThreads.size() > 1) {
//DEFAULT TO ROUND ROBIN SCHEME
//e.g. Move highest priority to end of thread list
list<ThreadID>::iterator list_begin = activeThreads.begin();
unsigned high_thread = *list_begin;
activeThreads.erase(list_begin);
activeThreads.push_back(high_thread);
}
}
template <class Impl>
void
FullO3CPU<Impl>::addThreadToExitingList(ThreadID tid)
{
DPRINTF(O3CPU, "Thread %d is inserted to exitingThreads list\n", tid);
// the thread trying to exit can't be already halted
assert(tcBase(tid)->status() != ThreadContext::Halted);
// make sure the thread has not been added to the list yet
assert(exitingThreads.count(tid) == 0);
// add the thread to exitingThreads list to mark that this thread is
// trying to exit. The boolean value in the pair denotes if a thread is
// ready to exit. The thread is not ready to exit until the corresponding
// exit trap event is processed in the future. Until then, it'll be still
// an active thread that is trying to exit.
exitingThreads.emplace(std::make_pair(tid, false));
}
template <class Impl>
bool
FullO3CPU<Impl>::isThreadExiting(ThreadID tid) const
{
return exitingThreads.count(tid) == 1;
}
template <class Impl>
void
FullO3CPU<Impl>::scheduleThreadExitEvent(ThreadID tid)
{
assert(exitingThreads.count(tid) == 1);
// exit trap event has been processed. Now, the thread is ready to exit
// and be removed from the CPU.
exitingThreads[tid] = true;
// we schedule a threadExitEvent in the next cycle to properly clean
// up the thread's states in the pipeline. threadExitEvent has lower
// priority than tickEvent, so the cleanup will happen at the very end
// of the next cycle after all pipeline stages complete their operations.
// We want all stages to complete squashing instructions before doing
// the cleanup.
if (!threadExitEvent.scheduled()) {
schedule(threadExitEvent, nextCycle());
}
}
template <class Impl>
void
FullO3CPU<Impl>::exitThreads()
{
// there must be at least one thread trying to exit
assert(exitingThreads.size() > 0);
// terminate all threads that are ready to exit
auto it = exitingThreads.begin();
while (it != exitingThreads.end()) {
ThreadID thread_id = it->first;
bool readyToExit = it->second;
if (readyToExit) {
DPRINTF(O3CPU, "Exiting thread %d\n", thread_id);
haltContext(thread_id);
tcBase(thread_id)->setStatus(ThreadContext::Halted);
it = exitingThreads.erase(it);
} else {
it++;
}
}
}
// Forward declaration of FullO3CPU.
template class FullO3CPU<O3CPUImpl>;