main.cc revision 1388
111986Sandreas.sandberg@arm.com/*
211986Sandreas.sandberg@arm.com * Copyright (c) 2000-2004 The Regents of The University of Michigan
311986Sandreas.sandberg@arm.com * All rights reserved.
411986Sandreas.sandberg@arm.com *
511986Sandreas.sandberg@arm.com * Redistribution and use in source and binary forms, with or without
611986Sandreas.sandberg@arm.com * modification, are permitted provided that the following conditions are
711986Sandreas.sandberg@arm.com * met: redistributions of source code must retain the above copyright
811986Sandreas.sandberg@arm.com * notice, this list of conditions and the following disclaimer;
911986Sandreas.sandberg@arm.com * redistributions in binary form must reproduce the above copyright
1011986Sandreas.sandberg@arm.com * notice, this list of conditions and the following disclaimer in the
1112037Sandreas.sandberg@arm.com * documentation and/or other materials provided with the distribution;
1211986Sandreas.sandberg@arm.com * neither the name of the copyright holders nor the names of its
1312391Sjason@lowepower.com * contributors may be used to endorse or promote products derived from
1411986Sandreas.sandberg@arm.com * this software without specific prior written permission.
1511986Sandreas.sandberg@arm.com *
1612037Sandreas.sandberg@arm.com * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1711986Sandreas.sandberg@arm.com * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1811986Sandreas.sandberg@arm.com * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
1911986Sandreas.sandberg@arm.com * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
2012037Sandreas.sandberg@arm.com * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
2112037Sandreas.sandberg@arm.com * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
2212037Sandreas.sandberg@arm.com * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
2312037Sandreas.sandberg@arm.com * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
2412037Sandreas.sandberg@arm.com * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
2512037Sandreas.sandberg@arm.com * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
2611986Sandreas.sandberg@arm.com * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
2712037Sandreas.sandberg@arm.com */
2812037Sandreas.sandberg@arm.com
2912037Sandreas.sandberg@arm.com///
3012037Sandreas.sandberg@arm.com/// @file sim/main.cc
3112037Sandreas.sandberg@arm.com///
3212037Sandreas.sandberg@arm.com#include <sys/types.h>
3312037Sandreas.sandberg@arm.com#include <sys/stat.h>
3412037Sandreas.sandberg@arm.com#include <stdlib.h>
3512037Sandreas.sandberg@arm.com#include <signal.h>
3612037Sandreas.sandberg@arm.com
3712037Sandreas.sandberg@arm.com#include <list>
3812037Sandreas.sandberg@arm.com#include <string>
3912037Sandreas.sandberg@arm.com#include <vector>
4012037Sandreas.sandberg@arm.com
4112037Sandreas.sandberg@arm.com#include "base/copyright.hh"
4212037Sandreas.sandberg@arm.com#include "base/embedfile.hh"
4312037Sandreas.sandberg@arm.com#include "base/inifile.hh"
4412037Sandreas.sandberg@arm.com#include "base/misc.hh"
4512037Sandreas.sandberg@arm.com#include "base/output.hh"
4612037Sandreas.sandberg@arm.com#include "base/pollevent.hh"
4712037Sandreas.sandberg@arm.com#include "base/statistics.hh"
4812037Sandreas.sandberg@arm.com#include "base/str.hh"
4912037Sandreas.sandberg@arm.com#include "base/time.hh"
5012037Sandreas.sandberg@arm.com#include "cpu/base_cpu.hh"
5112037Sandreas.sandberg@arm.com#include "cpu/full_cpu/smt.hh"
5212037Sandreas.sandberg@arm.com#include "sim/async.hh"
5312037Sandreas.sandberg@arm.com#include "sim/builder.hh"
5412037Sandreas.sandberg@arm.com#include "sim/configfile.hh"
5512037Sandreas.sandberg@arm.com#include "sim/host.hh"
5612037Sandreas.sandberg@arm.com#include "sim/sim_events.hh"
5712037Sandreas.sandberg@arm.com#include "sim/sim_exit.hh"
5812037Sandreas.sandberg@arm.com#include "sim/sim_object.hh"
5912037Sandreas.sandberg@arm.com#include "sim/stat_control.hh"
6012037Sandreas.sandberg@arm.com#include "sim/stats.hh"
6112037Sandreas.sandberg@arm.com#include "sim/universe.hh"
6212037Sandreas.sandberg@arm.com#include "sim/pyconfig/pyconfig.hh"
6312037Sandreas.sandberg@arm.com
6412037Sandreas.sandberg@arm.comusing namespace std;
6512037Sandreas.sandberg@arm.com
6612037Sandreas.sandberg@arm.com// See async.h.
6712037Sandreas.sandberg@arm.comvolatile bool async_event = false;
6812037Sandreas.sandberg@arm.comvolatile bool async_dump = false;
6912037Sandreas.sandberg@arm.comvolatile bool async_dumpreset = false;
7012037Sandreas.sandberg@arm.comvolatile bool async_exit = false;
7112037Sandreas.sandberg@arm.comvolatile bool async_io = false;
7211986Sandreas.sandberg@arm.comvolatile bool async_alarm = false;
7312391Sjason@lowepower.com
7412391Sjason@lowepower.com/// Stats signal handler.
7512391Sjason@lowepower.comvoid
7612391Sjason@lowepower.comdumpStatsHandler(int sigtype)
7712391Sjason@lowepower.com{
7812391Sjason@lowepower.com    async_event = true;
7912391Sjason@lowepower.com    async_dump = true;
8012391Sjason@lowepower.com}
8112391Sjason@lowepower.com
8212391Sjason@lowepower.comvoid
8312391Sjason@lowepower.comdumprstStatsHandler(int sigtype)
8411986Sandreas.sandberg@arm.com{
8511986Sandreas.sandberg@arm.com    async_event = true;
8611986Sandreas.sandberg@arm.com    async_dumpreset = true;
8712391Sjason@lowepower.com}
8812037Sandreas.sandberg@arm.com
8912037Sandreas.sandberg@arm.com/// Exit signal handler.
9012037Sandreas.sandberg@arm.comvoid
9112037Sandreas.sandberg@arm.comexitNowHandler(int sigtype)
9212037Sandreas.sandberg@arm.com{
9312037Sandreas.sandberg@arm.com    async_event = true;
9412037Sandreas.sandberg@arm.com    async_exit = true;
9511986Sandreas.sandberg@arm.com}
9612391Sjason@lowepower.com
9712037Sandreas.sandberg@arm.com/// Abort signal handler.
9812037Sandreas.sandberg@arm.comvoid
9912037Sandreas.sandberg@arm.comabortHandler(int sigtype)
10012037Sandreas.sandberg@arm.com{
10112037Sandreas.sandberg@arm.com    cerr << "Program aborted at cycle " << curTick << endl;
10212037Sandreas.sandberg@arm.com
10312391Sjason@lowepower.com#if TRACING_ON
10412037Sandreas.sandberg@arm.com    // dump trace buffer, if there is one
10512037Sandreas.sandberg@arm.com    Trace::theLog.dump(cerr);
10612037Sandreas.sandberg@arm.com#endif
10712037Sandreas.sandberg@arm.com}
10812037Sandreas.sandberg@arm.com
10912037Sandreas.sandberg@arm.com/// Simulator executable name
11012037Sandreas.sandberg@arm.comconst char *myProgName = "";
11112037Sandreas.sandberg@arm.com
11212037Sandreas.sandberg@arm.com/// Show brief help message.
11312037Sandreas.sandberg@arm.comvoid
11412037Sandreas.sandberg@arm.comshowBriefHelp(ostream &out)
11512037Sandreas.sandberg@arm.com{
11612037Sandreas.sandberg@arm.com    char *prog = basename(myProgName);
11712037Sandreas.sandberg@arm.com
11812037Sandreas.sandberg@arm.com    ccprintf(out, "Usage:\n");
11912037Sandreas.sandberg@arm.com    ccprintf(out,
12012037Sandreas.sandberg@arm.com"%s [-d <dir>] [-E <var>[=<val>]] [-I <dir>] [-P <python>]\n"
12112037Sandreas.sandberg@arm.com"        [--<var>=<val>] <config file>\n"
12212037Sandreas.sandberg@arm.com"\n"
12312037Sandreas.sandberg@arm.com"   -d            set the output directory to <dir>\n"
12412037Sandreas.sandberg@arm.com"   -E            set the environment variable <var> to <val> (or 'True')\n"
12512037Sandreas.sandberg@arm.com"   -I            add the directory <dir> to python's path\n"
12612037Sandreas.sandberg@arm.com"   -P            execute <python> directly in the configuration\n"
12712037Sandreas.sandberg@arm.com"   --var=val     set the python variable <var> to '<val>'\n"
12812037Sandreas.sandberg@arm.com"   <configfile>  config file name (.py or .mpy)\n",
12912037Sandreas.sandberg@arm.com             prog);
13012037Sandreas.sandberg@arm.com
13112037Sandreas.sandberg@arm.com    ccprintf(out, "%s -X\n    -X            extract embedded files\n", prog);
13212037Sandreas.sandberg@arm.com    ccprintf(out, "%s -h\n    -h            print long help\n", prog);
13312037Sandreas.sandberg@arm.com}
13412037Sandreas.sandberg@arm.com
13512037Sandreas.sandberg@arm.com/// Show verbose help message.  Includes parameter listing from
13612037Sandreas.sandberg@arm.com/// showBriefHelp(), plus an exhaustive list of ini-file parameters
13712037Sandreas.sandberg@arm.com/// and SimObjects (with their parameters).
13812037Sandreas.sandberg@arm.comvoid
13912037Sandreas.sandberg@arm.comshowLongHelp(ostream &out)
14012037Sandreas.sandberg@arm.com{
14112037Sandreas.sandberg@arm.com    showBriefHelp(out);
14212037Sandreas.sandberg@arm.com
14312037Sandreas.sandberg@arm.com    out << endl
14412037Sandreas.sandberg@arm.com        << endl
14512037Sandreas.sandberg@arm.com        << "-----------------" << endl
14612037Sandreas.sandberg@arm.com        << "Global Parameters" << endl
14712037Sandreas.sandberg@arm.com        << "-----------------" << endl
14812037Sandreas.sandberg@arm.com        << endl;
14912037Sandreas.sandberg@arm.com
15012037Sandreas.sandberg@arm.com    ParamContext::describeAllContexts(out);
15112037Sandreas.sandberg@arm.com
15212037Sandreas.sandberg@arm.com    out << endl
15312037Sandreas.sandberg@arm.com        << endl
15412037Sandreas.sandberg@arm.com        << "-----------------" << endl
15512037Sandreas.sandberg@arm.com        << "Simulator Objects" << endl
15611986Sandreas.sandberg@arm.com        << "-----------------" << endl
15711986Sandreas.sandberg@arm.com        << endl;
15811986Sandreas.sandberg@arm.com
15911986Sandreas.sandberg@arm.com    SimObjectClass::describeAllClasses(out);
16011986Sandreas.sandberg@arm.com}
16111986Sandreas.sandberg@arm.com
16211986Sandreas.sandberg@arm.com/// Print welcome message.
16311986Sandreas.sandberg@arm.comvoid
16411986Sandreas.sandberg@arm.comsayHello(ostream &out)
16511986Sandreas.sandberg@arm.com{
16611986Sandreas.sandberg@arm.com    extern const char *compileDate;	// from date.cc
16712391Sjason@lowepower.com
16812037Sandreas.sandberg@arm.com    ccprintf(out, "M5 Simulator System\n");
16912037Sandreas.sandberg@arm.com    // display copyright
17012037Sandreas.sandberg@arm.com    ccprintf(out, "%s\n", briefCopyright);
17112037Sandreas.sandberg@arm.com    ccprintf(out, "M5 compiled on %d\n", compileDate);
17212037Sandreas.sandberg@arm.com
17312037Sandreas.sandberg@arm.com    char *host = getenv("HOSTNAME");
17412037Sandreas.sandberg@arm.com    if (!host)
17512037Sandreas.sandberg@arm.com        host = getenv("HOST");
17612037Sandreas.sandberg@arm.com
17712037Sandreas.sandberg@arm.com    if (host)
17812037Sandreas.sandberg@arm.com        ccprintf(out, "M5 executing on %s\n", host);
17912037Sandreas.sandberg@arm.com
18012037Sandreas.sandberg@arm.com    ccprintf(out, "M5 simulation started %s\n", Time::start);
18112037Sandreas.sandberg@arm.com}
18212037Sandreas.sandberg@arm.com
18312037Sandreas.sandberg@arm.com///
18412037Sandreas.sandberg@arm.com/// Echo the command line for posterity in such a way that it can be
18512037Sandreas.sandberg@arm.com/// used to rerun the same simulation (given the same .ini files).
18612037Sandreas.sandberg@arm.com///
18712037Sandreas.sandberg@arm.comvoid
18812037Sandreas.sandberg@arm.comechoCommandLine(int argc, char **argv, ostream &out)
18912037Sandreas.sandberg@arm.com{
19012037Sandreas.sandberg@arm.com    out << "command line: " << argv[0];
19112037Sandreas.sandberg@arm.com    for (int i = 1; i < argc; i++) {
19212037Sandreas.sandberg@arm.com        string arg(argv[i]);
19312037Sandreas.sandberg@arm.com
19412037Sandreas.sandberg@arm.com        out << ' ';
19512037Sandreas.sandberg@arm.com
19612037Sandreas.sandberg@arm.com        // If the arg contains spaces, we need to quote it.
19712037Sandreas.sandberg@arm.com        // The rest of this is overkill to make it look purty.
19812037Sandreas.sandberg@arm.com
19912037Sandreas.sandberg@arm.com        // print dashes first outside quotes
20012037Sandreas.sandberg@arm.com        int non_dash_pos = arg.find_first_not_of("-");
20112037Sandreas.sandberg@arm.com        out << arg.substr(0, non_dash_pos);	// print dashes
20212037Sandreas.sandberg@arm.com        string body = arg.substr(non_dash_pos);	// the rest
20312037Sandreas.sandberg@arm.com
20412037Sandreas.sandberg@arm.com        // if it's an assignment, handle the lhs & rhs separately
20512037Sandreas.sandberg@arm.com        int eq_pos = body.find("=");
20612037Sandreas.sandberg@arm.com        if (eq_pos == string::npos) {
20712037Sandreas.sandberg@arm.com            out << quote(body);
20812037Sandreas.sandberg@arm.com        }
20912037Sandreas.sandberg@arm.com        else {
21012037Sandreas.sandberg@arm.com            string lhs(body.substr(0, eq_pos));
21112037Sandreas.sandberg@arm.com            string rhs(body.substr(eq_pos + 1));
21212037Sandreas.sandberg@arm.com
21312037Sandreas.sandberg@arm.com            out << quote(lhs) << "=" << quote(rhs);
21412391Sjason@lowepower.com        }
21511986Sandreas.sandberg@arm.com    }
21611986Sandreas.sandberg@arm.com    out << endl << endl;
21711986Sandreas.sandberg@arm.com}
21811986Sandreas.sandberg@arm.com
21911986Sandreas.sandberg@arm.comchar *
22011986Sandreas.sandberg@arm.comgetOptionString(int &index, int argc, char **argv)
22111986Sandreas.sandberg@arm.com{
22211986Sandreas.sandberg@arm.com    char *option = argv[index] + 2;
22311986Sandreas.sandberg@arm.com    if (*option != '\0')
22411986Sandreas.sandberg@arm.com        return option;
22511986Sandreas.sandberg@arm.com
22611986Sandreas.sandberg@arm.com    // We didn't find an argument, it must be in the next variable.
22711986Sandreas.sandberg@arm.com    if (++index >= argc)
22811986Sandreas.sandberg@arm.com        panic("option string for option '%s' not found", argv[index - 1]);
22911986Sandreas.sandberg@arm.com
23011986Sandreas.sandberg@arm.com    return argv[index];
23112037Sandreas.sandberg@arm.com}
23212037Sandreas.sandberg@arm.com
23312037Sandreas.sandberg@arm.comint
23412037Sandreas.sandberg@arm.commain(int argc, char **argv)
23512037Sandreas.sandberg@arm.com{
23612037Sandreas.sandberg@arm.com    // Save off program name
23712037Sandreas.sandberg@arm.com    myProgName = argv[0];
23811986Sandreas.sandberg@arm.com
23912391Sjason@lowepower.com    signal(SIGFPE, SIG_IGN);		// may occur on misspeculated paths
24012037Sandreas.sandberg@arm.com    signal(SIGTRAP, SIG_IGN);
24112037Sandreas.sandberg@arm.com    signal(SIGUSR1, dumpStatsHandler);		// dump intermediate stats
24212037Sandreas.sandberg@arm.com    signal(SIGUSR2, dumprstStatsHandler);	// dump and reset stats
24312037Sandreas.sandberg@arm.com    signal(SIGINT, exitNowHandler);		// dump final stats and exit
24412037Sandreas.sandberg@arm.com    signal(SIGABRT, abortHandler);
24512391Sjason@lowepower.com
24612037Sandreas.sandberg@arm.com    sayHello(cerr);
24712037Sandreas.sandberg@arm.com
24812037Sandreas.sandberg@arm.com    bool configfile_found = false;
24912391Sjason@lowepower.com    PythonConfig pyconfig;
25012037Sandreas.sandberg@arm.com    string outdir;
25112037Sandreas.sandberg@arm.com
25212037Sandreas.sandberg@arm.com    // Parse command-line options.
25312037Sandreas.sandberg@arm.com    // Since most of the complex options are handled through the
25412391Sjason@lowepower.com    // config database, we don't mess with getopts, and just parse
25512037Sandreas.sandberg@arm.com    // manually.
25612037Sandreas.sandberg@arm.com    for (int i = 1; i < argc; ++i) {
25712037Sandreas.sandberg@arm.com        char *arg_str = argv[i];
25812037Sandreas.sandberg@arm.com
25912391Sjason@lowepower.com        // if arg starts with '--', parse as a special python option
26012037Sandreas.sandberg@arm.com        // of the format --<python var>=<string value>, if the arg
26112037Sandreas.sandberg@arm.com        // starts with '-', it should be a simulator option with a
26212037Sandreas.sandberg@arm.com        // format similar to getopt.  In any other case, treat the
26312037Sandreas.sandberg@arm.com        // option as a configuration file name and load it.
26411986Sandreas.sandberg@arm.com        if (arg_str[0] == '-' && arg_str[1] == '-') {
26512391Sjason@lowepower.com            string str = &arg_str[2];
26612037Sandreas.sandberg@arm.com            string var, val;
26712037Sandreas.sandberg@arm.com
26812037Sandreas.sandberg@arm.com            if (!split_first(str, var, val, '='))
26912037Sandreas.sandberg@arm.com                panic("Could not parse configuration argument '%s'\n"
27012037Sandreas.sandberg@arm.com                      "Expecting --<variable>=<value>\n", arg_str);
27111986Sandreas.sandberg@arm.com
27211986Sandreas.sandberg@arm.com            pyconfig.setVariable(var, val);
27312391Sjason@lowepower.com        } else if (arg_str[0] == '-') {
27412037Sandreas.sandberg@arm.com            char *option;
27512037Sandreas.sandberg@arm.com            string var, val;
27612037Sandreas.sandberg@arm.com
27712037Sandreas.sandberg@arm.com            // switch on second char
27812037Sandreas.sandberg@arm.com            switch (arg_str[1]) {
27912037Sandreas.sandberg@arm.com              case 'd':
28012037Sandreas.sandberg@arm.com                outdir = getOptionString(i, argc, argv);
28112037Sandreas.sandberg@arm.com                break;
28212037Sandreas.sandberg@arm.com
28311986Sandreas.sandberg@arm.com              case 'h':
28412391Sjason@lowepower.com                showLongHelp(cerr);
28512037Sandreas.sandberg@arm.com                exit(1);
28612037Sandreas.sandberg@arm.com
28712037Sandreas.sandberg@arm.com              case 'E':
28812037Sandreas.sandberg@arm.com                option = getOptionString(i, argc, argv);
28912037Sandreas.sandberg@arm.com                if (!split_first(option, var, val, '='))
29011986Sandreas.sandberg@arm.com                    val = "True";
29112391Sjason@lowepower.com
29212391Sjason@lowepower.com                if (setenv(var.c_str(), val.c_str(), true) == -1)
29312391Sjason@lowepower.com                    panic("setenv: %s\n", strerror(errno));
29412391Sjason@lowepower.com                break;
29512391Sjason@lowepower.com
29612391Sjason@lowepower.com              case 'I':
29712391Sjason@lowepower.com                option = getOptionString(i, argc, argv);
29812391Sjason@lowepower.com                pyconfig.addPath(option);
29912391Sjason@lowepower.com                break;
30012037Sandreas.sandberg@arm.com
30112037Sandreas.sandberg@arm.com              case 'P':
30212037Sandreas.sandberg@arm.com                option = getOptionString(i, argc, argv);
30312037Sandreas.sandberg@arm.com                pyconfig.writeLine(option);
30412391Sjason@lowepower.com                break;
30512391Sjason@lowepower.com
30612391Sjason@lowepower.com              case 'X': {
30712391Sjason@lowepower.com                  list<EmbedFile> lst;
30812391Sjason@lowepower.com                  EmbedMap::all(lst);
30912391Sjason@lowepower.com                  list<EmbedFile>::iterator i = lst.begin();
31012391Sjason@lowepower.com                  list<EmbedFile>::iterator end = lst.end();
31112391Sjason@lowepower.com
31212391Sjason@lowepower.com                  while (i != end) {
31312391Sjason@lowepower.com                      cprintf("Embedded File: %s\n", i->name);
31412391Sjason@lowepower.com                      cout.write(i->data, i->length);
31512391Sjason@lowepower.com                      ++i;
31612391Sjason@lowepower.com                  }
31712391Sjason@lowepower.com
318                  return 0;
319              }
320
321              default:
322                showBriefHelp(cerr);
323                panic("invalid argument '%s'\n", arg_str);
324            }
325        } else {
326            string file(arg_str);
327            string base, ext;
328
329            if (!split_last(file, base, ext, '.') ||
330                ext != "py" && ext != "mpy")
331                panic("Config file '%s' must end in '.py' or '.mpy'\n", file);
332
333            pyconfig.load(file);
334            configfile_found = true;
335        }
336    }
337
338    if (outdir.empty()) {
339        char *env = getenv("OUTPUT_DIR");
340        outdir = env ? env : ".";
341    }
342
343    simout.setDirectory(outdir);
344
345    char *env = getenv("CONFIG_OUTPUT");
346    if (!env)
347        env = "config.out";
348    configStream = simout.find(env);
349
350    if (!configfile_found)
351        panic("no configuration file specified!");
352
353    // The configuration database is now complete; start processing it.
354    IniFile inifile;
355    if (!pyconfig.output(inifile))
356        panic("Error processing python code");
357
358    // Initialize statistics database
359    Stats::InitSimStats();
360
361    // Now process the configuration hierarchy and create the SimObjects.
362    ConfigHierarchy configHierarchy(inifile);
363    configHierarchy.build();
364    configHierarchy.createSimObjects();
365
366    // Parse and check all non-config-hierarchy parameters.
367    ParamContext::parseAllContexts(inifile);
368    ParamContext::checkAllContexts();
369
370    // Print hello message to stats file if it's actually a file.  If
371    // it's not (i.e. it's cout or cerr) then we already did it above.
372    if (simout.isFile(*outputStream))
373        sayHello(*outputStream);
374
375    // Echo command line and all parameter settings to stats file as well.
376    echoCommandLine(argc, argv, *outputStream);
377    ParamContext::showAllContexts(*configStream);
378
379    // Do a second pass to finish initializing the sim objects
380    SimObject::initAll();
381
382    // Restore checkpointed state, if any.
383    configHierarchy.unserializeSimObjects();
384
385    // Done processing the configuration database.
386    // Check for unreferenced entries.
387    if (inifile.printUnreferenced())
388        panic("unreferenced sections/entries in the intermediate ini file");
389
390    SimObject::regAllStats();
391
392    // uncomment the following to get PC-based execution-time profile
393#ifdef DO_PROFILE
394    init_profile((char *)&_init, (char *)&_fini);
395#endif
396
397    // Check to make sure that the stats package is properly initialized
398    Stats::check();
399
400    // Reset to put the stats in a consistent state.
401    Stats::reset();
402
403    // Nothing to simulate if we don't have at least one CPU somewhere.
404    if (BaseCPU::numSimulatedCPUs() == 0) {
405        cerr << "Fatal: no CPUs to simulate." << endl;
406        exit(1);
407    }
408
409    warn("Entering event queue.  Starting simulation...\n");
410    SimStartup();
411    while (!mainEventQueue.empty()) {
412        assert(curTick <= mainEventQueue.nextTick() &&
413               "event scheduled in the past");
414
415        // forward current cycle to the time of the first event on the
416        // queue
417        curTick = mainEventQueue.nextTick();
418        mainEventQueue.serviceOne();
419
420        if (async_event) {
421            async_event = false;
422            if (async_dump) {
423                async_dump = false;
424
425                using namespace Stats;
426                SetupEvent(Dump, curTick);
427            }
428
429            if (async_dumpreset) {
430                async_dumpreset = false;
431
432                using namespace Stats;
433                SetupEvent(Dump | Reset, curTick);
434            }
435
436            if (async_exit) {
437                async_exit = false;
438                new SimExitEvent("User requested STOP");
439            }
440
441            if (async_io || async_alarm) {
442                async_io = false;
443                async_alarm = false;
444                pollQueue.service();
445            }
446        }
447    }
448
449    // This should never happen... every conceivable way for the
450    // simulation to terminate (hit max cycles/insts, signal,
451    // simulated system halts/exits) generates an exit event, so we
452    // should never run out of events on the queue.
453    exitNow("no events on event loop!  All CPUs must be idle.", 1);
454
455    return 0;
456}
457