f0fb3ac060
Make interrupts use the new wakeup method, and pull all of the interrupt stuff into the cpu base class so that only the wakeup code needs to be updated. I tried to make wakeup, wakeCPU, and the various other mechanisms for waking and sleeping a little more sane, but I couldn't understand why the statistics were changing the way they were. Maybe we'll try again some day.
434 lines
12 KiB
C++
434 lines
12 KiB
C++
/*
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* Copyright (c) 2002-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Steve Reinhardt
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* Nathan Binkert
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*/
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#include <iostream>
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#include <string>
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#include <sstream>
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#include "base/cprintf.hh"
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#include "base/loader/symtab.hh"
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#include "base/misc.hh"
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#include "base/output.hh"
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#include "base/trace.hh"
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#include "cpu/base.hh"
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#include "cpu/cpuevent.hh"
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#include "cpu/thread_context.hh"
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#include "cpu/profile.hh"
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#include "params/BaseCPU.hh"
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#include "sim/sim_exit.hh"
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#include "sim/process.hh"
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#include "sim/sim_events.hh"
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#include "sim/system.hh"
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// Hack
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#include "sim/stat_control.hh"
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using namespace std;
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vector<BaseCPU *> BaseCPU::cpuList;
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// This variable reflects the max number of threads in any CPU. Be
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// careful to only use it once all the CPUs that you care about have
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// been initialized
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int maxThreadsPerCPU = 1;
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CPUProgressEvent::CPUProgressEvent(BaseCPU *_cpu, Tick ival)
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: Event(Event::Progress_Event_Pri), interval(ival), lastNumInst(0),
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cpu(_cpu)
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{
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if (interval)
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cpu->schedule(this, curTick + interval);
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}
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void
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CPUProgressEvent::process()
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{
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Counter temp = cpu->totalInstructions();
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#ifndef NDEBUG
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double ipc = double(temp - lastNumInst) / (interval / cpu->ticks(1));
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DPRINTFN("%s progress event, instructions committed: %lli, IPC: %0.8d\n",
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cpu->name(), temp - lastNumInst, ipc);
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ipc = 0.0;
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#else
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cprintf("%lli: %s progress event, instructions committed: %lli\n",
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curTick, cpu->name(), temp - lastNumInst);
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#endif
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lastNumInst = temp;
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cpu->schedule(this, curTick + interval);
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}
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const char *
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CPUProgressEvent::description() const
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{
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return "CPU Progress";
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}
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#if FULL_SYSTEM
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BaseCPU::BaseCPU(Params *p)
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: MemObject(p), clock(p->clock), instCnt(0), _cpuId(p->cpu_id),
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interrupts(p->interrupts),
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number_of_threads(p->numThreads), system(p->system),
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phase(p->phase)
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#else
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BaseCPU::BaseCPU(Params *p)
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: MemObject(p), clock(p->clock), _cpuId(p->cpu_id),
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number_of_threads(p->numThreads), system(p->system),
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phase(p->phase)
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#endif
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{
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// currentTick = curTick;
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// if Python did not provide a valid ID, do it here
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if (_cpuId == -1 ) {
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_cpuId = cpuList.size();
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}
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// add self to global list of CPUs
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cpuList.push_back(this);
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DPRINTF(SyscallVerbose, "Constructing CPU with id %d\n", _cpuId);
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if (number_of_threads > maxThreadsPerCPU)
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maxThreadsPerCPU = number_of_threads;
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// allocate per-thread instruction-based event queues
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comInstEventQueue = new EventQueue *[number_of_threads];
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for (int i = 0; i < number_of_threads; ++i)
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comInstEventQueue[i] = new EventQueue("instruction-based event queue");
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//
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// set up instruction-count-based termination events, if any
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//
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if (p->max_insts_any_thread != 0) {
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const char *cause = "a thread reached the max instruction count";
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for (int i = 0; i < number_of_threads; ++i) {
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Event *event = new SimLoopExitEvent(cause, 0);
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comInstEventQueue[i]->schedule(event, p->max_insts_any_thread);
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}
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}
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if (p->max_insts_all_threads != 0) {
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const char *cause = "all threads reached the max instruction count";
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// allocate & initialize shared downcounter: each event will
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// decrement this when triggered; simulation will terminate
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// when counter reaches 0
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int *counter = new int;
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*counter = number_of_threads;
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for (int i = 0; i < number_of_threads; ++i) {
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Event *event = new CountedExitEvent(cause, *counter);
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comInstEventQueue[i]->schedule(event, p->max_insts_any_thread);
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}
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}
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// allocate per-thread load-based event queues
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comLoadEventQueue = new EventQueue *[number_of_threads];
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for (int i = 0; i < number_of_threads; ++i)
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comLoadEventQueue[i] = new EventQueue("load-based event queue");
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//
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// set up instruction-count-based termination events, if any
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//
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if (p->max_loads_any_thread != 0) {
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const char *cause = "a thread reached the max load count";
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for (int i = 0; i < number_of_threads; ++i) {
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Event *event = new SimLoopExitEvent(cause, 0);
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comLoadEventQueue[i]->schedule(event, p->max_loads_any_thread);
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}
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}
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if (p->max_loads_all_threads != 0) {
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const char *cause = "all threads reached the max load count";
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// allocate & initialize shared downcounter: each event will
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// decrement this when triggered; simulation will terminate
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// when counter reaches 0
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int *counter = new int;
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*counter = number_of_threads;
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for (int i = 0; i < number_of_threads; ++i) {
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Event *event = new CountedExitEvent(cause, *counter);
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comLoadEventQueue[i]->schedule(event, p->max_loads_all_threads);
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}
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}
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functionTracingEnabled = false;
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if (p->function_trace) {
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functionTraceStream = simout.find(csprintf("ftrace.%s", name()));
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currentFunctionStart = currentFunctionEnd = 0;
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functionEntryTick = p->function_trace_start;
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if (p->function_trace_start == 0) {
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functionTracingEnabled = true;
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} else {
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typedef EventWrapper<BaseCPU, &BaseCPU::enableFunctionTrace> wrap;
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Event *event = new wrap(this, true);
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schedule(event, p->function_trace_start);
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}
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}
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#if FULL_SYSTEM
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profileEvent = NULL;
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if (params()->profile)
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profileEvent = new ProfileEvent(this, params()->profile);
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#endif
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tracer = params()->tracer;
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}
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void
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BaseCPU::enableFunctionTrace()
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{
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functionTracingEnabled = true;
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}
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BaseCPU::~BaseCPU()
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{
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}
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void
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BaseCPU::init()
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{
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if (!params()->defer_registration)
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registerThreadContexts();
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}
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void
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BaseCPU::startup()
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{
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#if FULL_SYSTEM
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if (!params()->defer_registration && profileEvent)
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schedule(profileEvent, curTick);
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#endif
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if (params()->progress_interval) {
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Tick num_ticks = ticks(params()->progress_interval);
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Event *event = new CPUProgressEvent(this, num_ticks);
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schedule(event, curTick + num_ticks);
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}
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}
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void
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BaseCPU::regStats()
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{
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using namespace Stats;
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numCycles
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.name(name() + ".numCycles")
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.desc("number of cpu cycles simulated")
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;
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int size = threadContexts.size();
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if (size > 1) {
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for (int i = 0; i < size; ++i) {
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stringstream namestr;
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ccprintf(namestr, "%s.ctx%d", name(), i);
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threadContexts[i]->regStats(namestr.str());
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}
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} else if (size == 1)
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threadContexts[0]->regStats(name());
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#if FULL_SYSTEM
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#endif
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}
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Tick
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BaseCPU::nextCycle()
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{
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Tick next_tick = curTick - phase + clock - 1;
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next_tick -= (next_tick % clock);
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next_tick += phase;
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return next_tick;
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}
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Tick
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BaseCPU::nextCycle(Tick begin_tick)
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{
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Tick next_tick = begin_tick;
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if (next_tick % clock != 0)
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next_tick = next_tick - (next_tick % clock) + clock;
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next_tick += phase;
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assert(next_tick >= curTick);
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return next_tick;
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}
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void
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BaseCPU::registerThreadContexts()
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{
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for (int i = 0; i < threadContexts.size(); ++i) {
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ThreadContext *tc = threadContexts[i];
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/** This is so that contextId and cpuId match where there is a
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* 1cpu:1context relationship. Otherwise, the order of registration
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* could affect the assignment and cpu 1 could have context id 3, for
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* example. We may even want to do something like this for SMT so that
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* cpu 0 has the lowest thread contexts and cpu N has the highest, but
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* I'll just do this for now
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*/
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if (number_of_threads == 1)
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tc->setContextId(system->registerThreadContext(tc, _cpuId));
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else
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tc->setContextId(system->registerThreadContext(tc));
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#if !FULL_SYSTEM
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tc->getProcessPtr()->assignThreadContext(tc->contextId());
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#endif
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}
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}
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int
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BaseCPU::findContext(ThreadContext *tc)
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{
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for (int i = 0; i < threadContexts.size(); ++i) {
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if (tc == threadContexts[i])
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return i;
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}
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return 0;
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}
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void
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BaseCPU::switchOut()
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{
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// panic("This CPU doesn't support sampling!");
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#if FULL_SYSTEM
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if (profileEvent && profileEvent->scheduled())
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deschedule(profileEvent);
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#endif
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}
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void
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BaseCPU::takeOverFrom(BaseCPU *oldCPU, Port *ic, Port *dc)
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{
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assert(threadContexts.size() == oldCPU->threadContexts.size());
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_cpuId = oldCPU->cpuId();
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for (int i = 0; i < threadContexts.size(); ++i) {
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ThreadContext *newTC = threadContexts[i];
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ThreadContext *oldTC = oldCPU->threadContexts[i];
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newTC->takeOverFrom(oldTC);
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CpuEvent::replaceThreadContext(oldTC, newTC);
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assert(newTC->contextId() == oldTC->contextId());
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assert(newTC->threadId() == oldTC->threadId());
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system->replaceThreadContext(newTC, newTC->contextId());
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if (DTRACE(Context))
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ThreadContext::compare(oldTC, newTC);
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}
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#if FULL_SYSTEM
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interrupts = oldCPU->interrupts;
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for (int i = 0; i < threadContexts.size(); ++i)
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threadContexts[i]->profileClear();
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if (profileEvent)
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schedule(profileEvent, curTick);
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#endif
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// Connect new CPU to old CPU's memory only if new CPU isn't
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// connected to anything. Also connect old CPU's memory to new
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// CPU.
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if (!ic->isConnected()) {
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Port *peer = oldCPU->getPort("icache_port")->getPeer();
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ic->setPeer(peer);
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peer->setPeer(ic);
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}
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if (!dc->isConnected()) {
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Port *peer = oldCPU->getPort("dcache_port")->getPeer();
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dc->setPeer(peer);
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peer->setPeer(dc);
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}
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}
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#if FULL_SYSTEM
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BaseCPU::ProfileEvent::ProfileEvent(BaseCPU *_cpu, Tick _interval)
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: cpu(_cpu), interval(_interval)
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{ }
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void
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BaseCPU::ProfileEvent::process()
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{
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for (int i = 0, size = cpu->threadContexts.size(); i < size; ++i) {
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ThreadContext *tc = cpu->threadContexts[i];
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tc->profileSample();
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}
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cpu->schedule(this, curTick + interval);
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}
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void
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BaseCPU::serialize(std::ostream &os)
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{
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SERIALIZE_SCALAR(instCnt);
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interrupts->serialize(os);
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}
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void
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BaseCPU::unserialize(Checkpoint *cp, const std::string §ion)
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{
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UNSERIALIZE_SCALAR(instCnt);
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interrupts->unserialize(cp, section);
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}
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#endif // FULL_SYSTEM
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void
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BaseCPU::traceFunctionsInternal(Addr pc)
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{
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if (!debugSymbolTable)
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return;
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// if pc enters different function, print new function symbol and
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// update saved range. Otherwise do nothing.
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if (pc < currentFunctionStart || pc >= currentFunctionEnd) {
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string sym_str;
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bool found = debugSymbolTable->findNearestSymbol(pc, sym_str,
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currentFunctionStart,
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currentFunctionEnd);
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if (!found) {
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// no symbol found: use addr as label
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sym_str = csprintf("0x%x", pc);
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currentFunctionStart = pc;
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currentFunctionEnd = pc + 1;
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}
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ccprintf(*functionTraceStream, " (%d)\n%d: %s",
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curTick - functionEntryTick, curTick, sym_str);
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functionEntryTick = curTick;
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}
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}
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