diff options
author | Gabe Black <gblack@eecs.umich.edu> | 2006-10-12 10:58:45 -0400 |
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committer | Gabe Black <gblack@eecs.umich.edu> | 2006-10-12 10:58:45 -0400 |
commit | 866cfaf9dc596d8547e14bc2133fb962776572a7 (patch) | |
tree | 19b82a8021533e8bc2e35f14fb0b6a0440756814 /src/cpu/simple/timing.cc | |
parent | 6a31898a88a9ecced399ccf50636831c21d4a75e (diff) | |
parent | 78aec04b660544ea7af80d76912b4422c4426602 (diff) | |
download | gem5-866cfaf9dc596d8547e14bc2133fb962776572a7.tar.xz |
Merge zizzer.eecs.umich.edu:/bk/newmem
into zeep.eecs.umich.edu:/home/gblack/m5/newmem
--HG--
extra : convert_revision : 30b2475ba034550376455e1bc0e52e19a200fd5a
Diffstat (limited to 'src/cpu/simple/timing.cc')
-rw-r--r-- | src/cpu/simple/timing.cc | 153 |
1 files changed, 104 insertions, 49 deletions
diff --git a/src/cpu/simple/timing.cc b/src/cpu/simple/timing.cc index 03ee27e04..33f673cbc 100644 --- a/src/cpu/simple/timing.cc +++ b/src/cpu/simple/timing.cc @@ -28,6 +28,7 @@ * Authors: Steve Reinhardt */ +#include "arch/locked_mem.hh" #include "arch/utility.hh" #include "cpu/exetrace.hh" #include "cpu/simple/timing.hh" @@ -73,7 +74,8 @@ TimingSimpleCPU::CpuPort::recvAtomic(Packet *pkt) void TimingSimpleCPU::CpuPort::recvFunctional(Packet *pkt) { - panic("TimingSimpleCPU doesn't expect recvFunctional callback!"); + //No internal storage to update, jusst return + return; } void @@ -94,12 +96,14 @@ TimingSimpleCPU::CpuPort::TickEvent::schedule(Packet *_pkt, Tick t) } TimingSimpleCPU::TimingSimpleCPU(Params *p) - : BaseSimpleCPU(p), icachePort(this, p->clock), dcachePort(this, p->clock) + : BaseSimpleCPU(p), icachePort(this, p->clock), dcachePort(this, p->clock), + cpu_id(p->cpu_id) { _status = Idle; ifetch_pkt = dcache_pkt = NULL; drainEvent = NULL; fetchEvent = NULL; + previousTick = 0; changeState(SimObject::Running); } @@ -158,6 +162,7 @@ TimingSimpleCPU::resume() assert(system->getMemoryMode() == System::Timing); changeState(SimObject::Running); + previousTick = curTick; } void @@ -165,6 +170,7 @@ TimingSimpleCPU::switchOut() { assert(status() == Running || status() == Idle); _status = SwitchedOut; + numCycles += curTick - previousTick; // If we've been scheduled to resume but are then told to switch out, // we'll need to cancel it. @@ -187,6 +193,27 @@ TimingSimpleCPU::takeOverFrom(BaseCPU *oldCPU) break; } } + + if (_status != Running) { + _status = Idle; + } + + Port *peer; + if (icachePort.getPeer() == NULL) { + peer = oldCPU->getPort("icache_port")->getPeer(); + icachePort.setPeer(peer); + } else { + peer = icachePort.getPeer(); + } + peer->setPeer(&icachePort); + + if (dcachePort.getPeer() == NULL) { + peer = oldCPU->getPort("dcache_port")->getPeer(); + dcachePort.setPeer(peer); + } else { + peer = dcachePort.getPeer(); + } + peer->setPeer(&dcachePort); } @@ -227,35 +254,35 @@ template <class T> Fault TimingSimpleCPU::read(Addr addr, T &data, unsigned flags) { - // need to fill in CPU & thread IDs here - Request *data_read_req = new Request(); - data_read_req->setThreadContext(0,0); //Need CPU/Thread IDS HERE - data_read_req->setVirt(0, addr, sizeof(T), flags, thread->readPC()); + Request *req = + new Request(/* asid */ 0, addr, sizeof(T), flags, thread->readPC(), + cpu_id, /* thread ID */ 0); if (traceData) { - traceData->setAddr(data_read_req->getVaddr()); + traceData->setAddr(req->getVaddr()); } // translate to physical address - Fault fault = thread->translateDataReadReq(data_read_req); + Fault fault = thread->translateDataReadReq(req); // Now do the access. if (fault == NoFault) { - Packet *data_read_pkt = - new Packet(data_read_req, Packet::ReadReq, Packet::Broadcast); - data_read_pkt->dataDynamic<T>(new T); + Packet *pkt = + new Packet(req, Packet::ReadReq, Packet::Broadcast); + pkt->dataDynamic<T>(new T); - if (!dcachePort.sendTiming(data_read_pkt)) { + if (!dcachePort.sendTiming(pkt)) { _status = DcacheRetry; - dcache_pkt = data_read_pkt; + dcache_pkt = pkt; } else { _status = DcacheWaitResponse; + // memory system takes ownership of packet dcache_pkt = NULL; } } // This will need a new way to tell if it has a dcache attached. - if (data_read_req->getFlags() & UNCACHEABLE) + if (req->isUncacheable()) recordEvent("Uncached Read"); return fault; @@ -308,31 +335,39 @@ template <class T> Fault TimingSimpleCPU::write(T data, Addr addr, unsigned flags, uint64_t *res) { - // need to fill in CPU & thread IDs here - Request *data_write_req = new Request(); - data_write_req->setThreadContext(0,0); //Need CPU/Thread IDS HERE - data_write_req->setVirt(0, addr, sizeof(T), flags, thread->readPC()); + Request *req = + new Request(/* asid */ 0, addr, sizeof(T), flags, thread->readPC(), + cpu_id, /* thread ID */ 0); // translate to physical address - Fault fault = thread->translateDataWriteReq(data_write_req); + Fault fault = thread->translateDataWriteReq(req); + // Now do the access. if (fault == NoFault) { - Packet *data_write_pkt = - new Packet(data_write_req, Packet::WriteReq, Packet::Broadcast); - data_write_pkt->allocate(); - data_write_pkt->set(data); + assert(dcache_pkt == NULL); + dcache_pkt = new Packet(req, Packet::WriteReq, Packet::Broadcast); + dcache_pkt->allocate(); + dcache_pkt->set(data); - if (!dcachePort.sendTiming(data_write_pkt)) { - _status = DcacheRetry; - dcache_pkt = data_write_pkt; - } else { - _status = DcacheWaitResponse; - dcache_pkt = NULL; + bool do_access = true; // flag to suppress cache access + + if (req->isLocked()) { + do_access = TheISA::handleLockedWrite(thread, req); + } + + if (do_access) { + if (!dcachePort.sendTiming(dcache_pkt)) { + _status = DcacheRetry; + } else { + _status = DcacheWaitResponse; + // memory system takes ownership of packet + dcache_pkt = NULL; + } } } // This will need a new way to tell if it's hooked up to a cache or not. - if (data_write_req->getFlags() & UNCACHEABLE) + if (req->isUncacheable()) recordEvent("Uncached Write"); // If the write needs to have a fault on the access, consider calling @@ -392,9 +427,8 @@ TimingSimpleCPU::fetch() { checkForInterrupts(); - // need to fill in CPU & thread IDs here Request *ifetch_req = new Request(); - ifetch_req->setThreadContext(0,0); //Need CPU/Thread IDS HERE + ifetch_req->setThreadContext(cpu_id, /* thread ID */ 0); Fault fault = setupFetchRequest(ifetch_req); ifetch_pkt = new Packet(ifetch_req, Packet::ReadReq, Packet::Broadcast); @@ -414,6 +448,9 @@ TimingSimpleCPU::fetch() // fetch fault: advance directly to next instruction (fault handler) advanceInst(fault); } + + numCycles += curTick - previousTick; + previousTick = curTick; } @@ -444,6 +481,9 @@ TimingSimpleCPU::completeIfetch(Packet *pkt) delete pkt->req; delete pkt; + numCycles += curTick - previousTick; + previousTick = curTick; + if (getState() == SimObject::Draining) { completeDrain(); return; @@ -453,12 +493,20 @@ TimingSimpleCPU::completeIfetch(Packet *pkt) if (curStaticInst->isMemRef() && !curStaticInst->isDataPrefetch()) { // load or store: just send to dcache Fault fault = curStaticInst->initiateAcc(this, traceData); - if (fault == NoFault) { - // successfully initiated access: instruction will - // complete in dcache response callback - assert(_status == DcacheWaitResponse); + if (_status != Running) { + // instruction will complete in dcache response callback + assert(_status == DcacheWaitResponse || _status == DcacheRetry); + assert(fault == NoFault); } else { - // fault: complete now to invoke fault handler + if (fault == NoFault) { + // early fail on store conditional: complete now + assert(dcache_pkt != NULL); + fault = curStaticInst->completeAcc(dcache_pkt, this, + traceData); + delete dcache_pkt->req; + delete dcache_pkt; + dcache_pkt = NULL; + } postExecute(); advanceInst(fault); } @@ -479,8 +527,7 @@ TimingSimpleCPU::IcachePort::ITickEvent::process() bool TimingSimpleCPU::IcachePort::recvTiming(Packet *pkt) { - // These next few lines could be replaced with something faster - // who knows what though + // delay processing of returned data until next CPU clock edge Tick time = pkt->req->getTime(); while (time < curTick) time += lat; @@ -516,21 +563,27 @@ TimingSimpleCPU::completeDataAccess(Packet *pkt) assert(_status == DcacheWaitResponse); _status = Running; - if (getState() == SimObject::Draining) { - completeDrain(); + numCycles += curTick - previousTick; + previousTick = curTick; - delete pkt->req; - delete pkt; + Fault fault = curStaticInst->completeAcc(pkt, this, traceData); - return; + if (pkt->isRead() && pkt->req->isLocked()) { + TheISA::handleLockedRead(thread, pkt->req); } - Fault fault = curStaticInst->completeAcc(pkt, this, traceData); - delete pkt->req; delete pkt; postExecute(); + + if (getState() == SimObject::Draining) { + advancePC(fault); + completeDrain(); + + return; + } + advanceInst(fault); } @@ -546,6 +599,7 @@ TimingSimpleCPU::completeDrain() bool TimingSimpleCPU::DcachePort::recvTiming(Packet *pkt) { + // delay processing of returned data until next CPU clock edge Tick time = pkt->req->getTime(); while (time < curTick) time += lat; @@ -574,6 +628,7 @@ TimingSimpleCPU::DcachePort::recvRetry() Packet *tmp = cpu->dcache_pkt; if (sendTiming(tmp)) { cpu->_status = DcacheWaitResponse; + // memory system takes ownership of packet cpu->dcache_pkt = NULL; } } @@ -592,11 +647,11 @@ BEGIN_DECLARE_SIM_OBJECT_PARAMS(TimingSimpleCPU) Param<Tick> progress_interval; SimObjectParam<MemObject *> mem; SimObjectParam<System *> system; + Param<int> cpu_id; #if FULL_SYSTEM SimObjectParam<AlphaITB *> itb; SimObjectParam<AlphaDTB *> dtb; - Param<int> cpu_id; Param<Tick> profile; #else SimObjectParam<Process *> workload; @@ -625,11 +680,11 @@ BEGIN_INIT_SIM_OBJECT_PARAMS(TimingSimpleCPU) INIT_PARAM(progress_interval, "Progress interval"), INIT_PARAM(mem, "memory"), INIT_PARAM(system, "system object"), + INIT_PARAM(cpu_id, "processor ID"), #if FULL_SYSTEM INIT_PARAM(itb, "Instruction TLB"), INIT_PARAM(dtb, "Data TLB"), - INIT_PARAM(cpu_id, "processor ID"), INIT_PARAM(profile, ""), #else INIT_PARAM(workload, "processes to run"), @@ -661,11 +716,11 @@ CREATE_SIM_OBJECT(TimingSimpleCPU) params->functionTraceStart = function_trace_start; params->mem = mem; params->system = system; + params->cpu_id = cpu_id; #if FULL_SYSTEM params->itb = itb; params->dtb = dtb; - params->cpu_id = cpu_id; params->profile = profile; #else params->process = workload; |