/* * Copyright (c) 2002-2005 The Regents of The University of Michigan * 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. * * Authors: Steve Reinhardt */ #include "arch/utility.hh" #include "cpu/exetrace.hh" #include "cpu/simple/timing.hh" #include "mem/packet_impl.hh" #include "sim/builder.hh" using namespace std; using namespace TheISA; void TimingSimpleCPU::init() { //Create Memory Ports (conect them up) Port *mem_dport = mem->getPort(""); dcachePort.setPeer(mem_dport); mem_dport->setPeer(&dcachePort); Port *mem_iport = mem->getPort(""); icachePort.setPeer(mem_iport); mem_iport->setPeer(&icachePort); BaseCPU::init(); #if FULL_SYSTEM for (int i = 0; i < execContexts.size(); ++i) { ExecContext *xc = execContexts[i]; // initialize CPU, including PC TheISA::initCPU(xc, xc->readCpuId()); } #endif } Tick TimingSimpleCPU::CpuPort::recvAtomic(Packet *pkt) { panic("TimingSimpleCPU doesn't expect recvAtomic callback!"); return curTick; } void TimingSimpleCPU::CpuPort::recvFunctional(Packet *pkt) { panic("TimingSimpleCPU doesn't expect recvFunctional callback!"); } void TimingSimpleCPU::CpuPort::recvStatusChange(Status status) { if (status == RangeChange) return; panic("TimingSimpleCPU doesn't expect recvStatusChange callback!"); } TimingSimpleCPU::TimingSimpleCPU(Params *p) : BaseSimpleCPU(p), icachePort(this), dcachePort(this) { _status = Idle; ifetch_pkt = dcache_pkt = NULL; } TimingSimpleCPU::~TimingSimpleCPU() { } void TimingSimpleCPU::serialize(ostream &os) { BaseSimpleCPU::serialize(os); SERIALIZE_ENUM(_status); } void TimingSimpleCPU::unserialize(Checkpoint *cp, const string §ion) { BaseSimpleCPU::unserialize(cp, section); UNSERIALIZE_ENUM(_status); } void TimingSimpleCPU::switchOut(Sampler *s) { sampler = s; if (status() == Running) { _status = SwitchedOut; } sampler->signalSwitched(); } void TimingSimpleCPU::takeOverFrom(BaseCPU *oldCPU) { BaseCPU::takeOverFrom(oldCPU); // if any of this CPU's ExecContexts are active, mark the CPU as // running and schedule its tick event. for (int i = 0; i < execContexts.size(); ++i) { ExecContext *xc = execContexts[i]; if (xc->status() == ExecContext::Active && _status != Running) { _status = Running; break; } } } void TimingSimpleCPU::activateContext(int thread_num, int delay) { assert(thread_num == 0); assert(cpuXC); assert(_status == Idle); notIdleFraction++; _status = Running; // kick things off by initiating the fetch of the next instruction Event *e = new EventWrapper(this, true); e->schedule(curTick + cycles(delay)); } void TimingSimpleCPU::suspendContext(int thread_num) { assert(thread_num == 0); assert(cpuXC); assert(_status == Running); // just change status to Idle... if status != Running, // completeInst() will not initiate fetch of next instruction. notIdleFraction--; _status = Idle; } template 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->setVirt(0, addr, sizeof(T), flags, cpuXC->readPC()); if (traceData) { traceData->setAddr(data_read_req->getVaddr()); } // translate to physical address Fault fault = cpuXC->translateDataReadReq(data_read_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(new T); if (!dcachePort.sendTiming(data_read_pkt)) { _status = DcacheRetry; dcache_pkt = data_read_pkt; } else { _status = DcacheWaitResponse; dcache_pkt = NULL; } } // This will need a new way to tell if it has a dcache attached. if (data_read_req->getFlags() & UNCACHEABLE) recordEvent("Uncached Read"); return fault; } #ifndef DOXYGEN_SHOULD_SKIP_THIS template Fault TimingSimpleCPU::read(Addr addr, uint64_t &data, unsigned flags); template Fault TimingSimpleCPU::read(Addr addr, uint32_t &data, unsigned flags); template Fault TimingSimpleCPU::read(Addr addr, uint16_t &data, unsigned flags); template Fault TimingSimpleCPU::read(Addr addr, uint8_t &data, unsigned flags); #endif //DOXYGEN_SHOULD_SKIP_THIS template<> Fault TimingSimpleCPU::read(Addr addr, double &data, unsigned flags) { return read(addr, *(uint64_t*)&data, flags); } template<> Fault TimingSimpleCPU::read(Addr addr, float &data, unsigned flags) { return read(addr, *(uint32_t*)&data, flags); } template<> Fault TimingSimpleCPU::read(Addr addr, int32_t &data, unsigned flags) { return read(addr, (uint32_t&)data, flags); } template 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->setVirt(0, addr, sizeof(T), flags, cpuXC->readPC()); // translate to physical address Fault fault = cpuXC->translateDataWriteReq(data_write_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); if (!dcachePort.sendTiming(data_write_pkt)) { _status = DcacheRetry; dcache_pkt = data_write_pkt; } else { _status = DcacheWaitResponse; 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) recordEvent("Uncached Write"); // If the write needs to have a fault on the access, consider calling // changeStatus() and changing it to "bad addr write" or something. return fault; } #ifndef DOXYGEN_SHOULD_SKIP_THIS template Fault TimingSimpleCPU::write(uint64_t data, Addr addr, unsigned flags, uint64_t *res); template Fault TimingSimpleCPU::write(uint32_t data, Addr addr, unsigned flags, uint64_t *res); template Fault TimingSimpleCPU::write(uint16_t data, Addr addr, unsigned flags, uint64_t *res); template Fault TimingSimpleCPU::write(uint8_t data, Addr addr, unsigned flags, uint64_t *res); #endif //DOXYGEN_SHOULD_SKIP_THIS template<> Fault TimingSimpleCPU::write(double data, Addr addr, unsigned flags, uint64_t *res) { return write(*(uint64_t*)&data, addr, flags, res); } template<> Fault TimingSimpleCPU::write(float data, Addr addr, unsigned flags, uint64_t *res) { return write(*(uint32_t*)&data, addr, flags, res); } template<> Fault TimingSimpleCPU::write(int32_t data, Addr addr, unsigned flags, uint64_t *res) { return write((uint32_t)data, addr, flags, res); } void TimingSimpleCPU::fetch() { checkForInterrupts(); // need to fill in CPU & thread IDs here Request *ifetch_req = new Request(); Fault fault = setupFetchRequest(ifetch_req); ifetch_pkt = new Packet(ifetch_req, Packet::ReadReq, Packet::Broadcast); ifetch_pkt->dataStatic(&inst); if (fault == NoFault) { if (!icachePort.sendTiming(ifetch_pkt)) { // Need to wait for retry _status = IcacheRetry; } else { // Need to wait for cache to respond _status = IcacheWaitResponse; // ownership of packet transferred to memory system ifetch_pkt = NULL; } } else { // fetch fault: advance directly to next instruction (fault handler) advanceInst(fault); } } void TimingSimpleCPU::advanceInst(Fault fault) { advancePC(fault); if (_status == Running) { // kick off fetch of next instruction... callback from icache // response will cause that instruction to be executed, // keeping the CPU running. fetch(); } } void TimingSimpleCPU::completeIfetch(Packet *pkt) { // received a response from the icache: execute the received // instruction assert(pkt->result == Packet::Success); assert(_status == IcacheWaitResponse); _status = Running; delete pkt->req; delete pkt; preExecute(); 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); } else { // fault: complete now to invoke fault handler postExecute(); advanceInst(fault); } } else { // non-memory instruction: execute completely now Fault fault = curStaticInst->execute(this, traceData); postExecute(); advanceInst(fault); } } bool TimingSimpleCPU::IcachePort::recvTiming(Packet *pkt) { cpu->completeIfetch(pkt); return true; } void TimingSimpleCPU::IcachePort::recvRetry() { // we shouldn't get a retry unless we have a packet that we're // waiting to transmit assert(cpu->ifetch_pkt != NULL); assert(cpu->_status == IcacheRetry); Packet *tmp = cpu->ifetch_pkt; if (sendTiming(tmp)) { cpu->_status = IcacheWaitResponse; cpu->ifetch_pkt = NULL; } } void TimingSimpleCPU::completeDataAccess(Packet *pkt) { // received a response from the dcache: complete the load or store // instruction assert(pkt->result == Packet::Success); assert(_status == DcacheWaitResponse); _status = Running; Fault fault = curStaticInst->completeAcc(pkt, this, traceData); delete pkt->req; delete pkt; postExecute(); advanceInst(fault); } bool TimingSimpleCPU::DcachePort::recvTiming(Packet *pkt) { cpu->completeDataAccess(pkt); return true; } void TimingSimpleCPU::DcachePort::recvRetry() { // we shouldn't get a retry unless we have a packet that we're // waiting to transmit assert(cpu->dcache_pkt != NULL); assert(cpu->_status == DcacheRetry); Packet *tmp = cpu->dcache_pkt; if (sendTiming(tmp)) { cpu->_status = DcacheWaitResponse; cpu->dcache_pkt = NULL; } } //////////////////////////////////////////////////////////////////////// // // TimingSimpleCPU Simulation Object // BEGIN_DECLARE_SIM_OBJECT_PARAMS(TimingSimpleCPU) Param max_insts_any_thread; Param max_insts_all_threads; Param max_loads_any_thread; Param max_loads_all_threads; SimObjectParam mem; #if FULL_SYSTEM SimObjectParam itb; SimObjectParam dtb; SimObjectParam system; Param cpu_id; Param profile; #else SimObjectParam workload; #endif // FULL_SYSTEM Param clock; Param defer_registration; Param width; Param function_trace; Param function_trace_start; Param simulate_stalls; END_DECLARE_SIM_OBJECT_PARAMS(TimingSimpleCPU) BEGIN_INIT_SIM_OBJECT_PARAMS(TimingSimpleCPU) INIT_PARAM(max_insts_any_thread, "terminate when any thread reaches this inst count"), INIT_PARAM(max_insts_all_threads, "terminate when all threads have reached this inst count"), INIT_PARAM(max_loads_any_thread, "terminate when any thread reaches this load count"), INIT_PARAM(max_loads_all_threads, "terminate when all threads have reached this load count"), INIT_PARAM(mem, "memory"), #if FULL_SYSTEM INIT_PARAM(itb, "Instruction TLB"), INIT_PARAM(dtb, "Data TLB"), INIT_PARAM(system, "system object"), INIT_PARAM(cpu_id, "processor ID"), INIT_PARAM(profile, ""), #else INIT_PARAM(workload, "processes to run"), #endif // FULL_SYSTEM INIT_PARAM(clock, "clock speed"), INIT_PARAM(defer_registration, "defer system registration (for sampling)"), INIT_PARAM(width, "cpu width"), INIT_PARAM(function_trace, "Enable function trace"), INIT_PARAM(function_trace_start, "Cycle to start function trace"), INIT_PARAM(simulate_stalls, "Simulate cache stall cycles") END_INIT_SIM_OBJECT_PARAMS(TimingSimpleCPU) CREATE_SIM_OBJECT(TimingSimpleCPU) { TimingSimpleCPU::Params *params = new TimingSimpleCPU::Params(); params->name = getInstanceName(); params->numberOfThreads = 1; params->max_insts_any_thread = max_insts_any_thread; params->max_insts_all_threads = max_insts_all_threads; params->max_loads_any_thread = max_loads_any_thread; params->max_loads_all_threads = max_loads_all_threads; params->deferRegistration = defer_registration; params->clock = clock; params->functionTrace = function_trace; params->functionTraceStart = function_trace_start; params->mem = mem; #if FULL_SYSTEM params->itb = itb; params->dtb = dtb; params->system = system; params->cpu_id = cpu_id; params->profile = profile; #else params->process = workload; #endif TimingSimpleCPU *cpu = new TimingSimpleCPU(params); return cpu; } REGISTER_SIM_OBJECT("TimingSimpleCPU", TimingSimpleCPU)