system.cc revision 9342:6fec8f26e56d 
1/*
2 * Copyright (c) 2011-2012 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2003-2006 The Regents of The University of Michigan
15 * Copyright (c) 2011 Regents of the University of California
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Steve Reinhardt
42 *          Lisa Hsu
43 *          Nathan Binkert
44 *          Ali Saidi
45 *          Rick Strong
46 */
47
48#include "arch/isa_traits.hh"
49#include "arch/remote_gdb.hh"
50#include "arch/utility.hh"
51#include "arch/vtophys.hh"
52#include "base/loader/object_file.hh"
53#include "base/loader/symtab.hh"
54#include "base/str.hh"
55#include "base/trace.hh"
56#include "config/the_isa.hh"
57#include "cpu/thread_context.hh"
58#include "debug/Loader.hh"
59#include "debug/WorkItems.hh"
60#include "kern/kernel_stats.hh"
61#include "mem/abstract_mem.hh"
62#include "mem/physical.hh"
63#include "params/System.hh"
64#include "sim/byteswap.hh"
65#include "sim/debug.hh"
66#include "sim/full_system.hh"
67#include "sim/system.hh"
68
69using namespace std;
70using namespace TheISA;
71
72vector<System *> System::systemList;
73
74int System::numSystemsRunning = 0;
75
76System::System(Params *p)
77    : MemObject(p), _systemPort("system_port", this),
78      _numContexts(0),
79      pagePtr(0),
80      init_param(p->init_param),
81      physProxy(_systemPort),
82      virtProxy(_systemPort),
83      loadAddrMask(p->load_addr_mask),
84      nextPID(0),
85      physmem(name() + ".physmem", p->memories),
86      memoryMode(p->mem_mode),
87      workItemsBegin(0),
88      workItemsEnd(0),
89      numWorkIds(p->num_work_ids),
90      _params(p),
91      totalNumInsts(0),
92      instEventQueue("system instruction-based event queue")
93{
94    // add self to global system list
95    systemList.push_back(this);
96
97    if (FullSystem) {
98        kernelSymtab = new SymbolTable;
99        if (!debugSymbolTable)
100            debugSymbolTable = new SymbolTable;
101    }
102
103    // Get the generic system master IDs
104    MasterID tmp_id M5_VAR_USED;
105    tmp_id = getMasterId("writebacks");
106    assert(tmp_id == Request::wbMasterId);
107    tmp_id = getMasterId("functional");
108    assert(tmp_id == Request::funcMasterId);
109    tmp_id = getMasterId("interrupt");
110    assert(tmp_id == Request::intMasterId);
111
112    if (FullSystem) {
113        if (params()->kernel == "") {
114            inform("No kernel set for full system simulation. "
115                   "Assuming you know what you're doing\n");
116
117            kernel = NULL;
118        } else {
119            // Get the kernel code
120            kernel = createObjectFile(params()->kernel);
121            inform("kernel located at: %s", params()->kernel);
122
123            if (kernel == NULL)
124                fatal("Could not load kernel file %s", params()->kernel);
125
126            // setup entry points
127            kernelStart = kernel->textBase();
128            kernelEnd = kernel->bssBase() + kernel->bssSize();
129            kernelEntry = kernel->entryPoint();
130
131            // load symbols
132            if (!kernel->loadGlobalSymbols(kernelSymtab))
133                fatal("could not load kernel symbols\n");
134
135            if (!kernel->loadLocalSymbols(kernelSymtab))
136                fatal("could not load kernel local symbols\n");
137
138            if (!kernel->loadGlobalSymbols(debugSymbolTable))
139                fatal("could not load kernel symbols\n");
140
141            if (!kernel->loadLocalSymbols(debugSymbolTable))
142                fatal("could not load kernel local symbols\n");
143
144            // Loading only needs to happen once and after memory system is
145            // connected so it will happen in initState()
146        }
147    }
148
149    // increment the number of running systms
150    numSystemsRunning++;
151
152    // Set back pointers to the system in all memories
153    for (int x = 0; x < params()->memories.size(); x++)
154        params()->memories[x]->system(this);
155}
156
157System::~System()
158{
159    delete kernelSymtab;
160    delete kernel;
161
162    for (uint32_t j = 0; j < numWorkIds; j++)
163        delete workItemStats[j];
164}
165
166void
167System::init()
168{
169    // check that the system port is connected
170    if (!_systemPort.isConnected())
171        panic("System port on %s is not connected.\n", name());
172}
173
174BaseMasterPort&
175System::getMasterPort(const std::string &if_name, PortID idx)
176{
177    // no need to distinguish at the moment (besides checking)
178    return _systemPort;
179}
180
181void
182System::setMemoryMode(Enums::MemoryMode mode)
183{
184    assert(getDrainState() == Drainable::Drained);
185    memoryMode = mode;
186}
187
188bool System::breakpoint()
189{
190    if (remoteGDB.size())
191        return remoteGDB[0]->breakpoint();
192    return false;
193}
194
195/**
196 * Setting rgdb_wait to a positive integer waits for a remote debugger to
197 * connect to that context ID before continuing.  This should really
198   be a parameter on the CPU object or something...
199 */
200int rgdb_wait = -1;
201
202int
203System::registerThreadContext(ThreadContext *tc, int assigned)
204{
205    int id;
206    if (assigned == -1) {
207        for (id = 0; id < threadContexts.size(); id++) {
208            if (!threadContexts[id])
209                break;
210        }
211
212        if (threadContexts.size() <= id)
213            threadContexts.resize(id + 1);
214    } else {
215        if (threadContexts.size() <= assigned)
216            threadContexts.resize(assigned + 1);
217        id = assigned;
218    }
219
220    if (threadContexts[id])
221        fatal("Cannot have two CPUs with the same id (%d)\n", id);
222
223    threadContexts[id] = tc;
224    _numContexts++;
225
226    int port = getRemoteGDBPort();
227    if (port) {
228        RemoteGDB *rgdb = new RemoteGDB(this, tc);
229        GDBListener *gdbl = new GDBListener(rgdb, port + id);
230        gdbl->listen();
231
232        if (rgdb_wait != -1 && rgdb_wait == id)
233            gdbl->accept();
234
235        if (remoteGDB.size() <= id) {
236            remoteGDB.resize(id + 1);
237        }
238
239        remoteGDB[id] = rgdb;
240    }
241
242    activeCpus.push_back(false);
243
244    return id;
245}
246
247int
248System::numRunningContexts()
249{
250    int running = 0;
251    for (int i = 0; i < _numContexts; ++i) {
252        if (threadContexts[i]->status() != ThreadContext::Halted)
253            ++running;
254    }
255    return running;
256}
257
258void
259System::initState()
260{
261    if (FullSystem) {
262        for (int i = 0; i < threadContexts.size(); i++)
263            TheISA::startupCPU(threadContexts[i], i);
264        // Moved from the constructor to here since it relies on the
265        // address map being resolved in the interconnect
266        /**
267         * Load the kernel code into memory
268         */
269        if (params()->kernel != "")  {
270            // Validate kernel mapping before loading binary
271            if (!(isMemAddr(kernelStart & loadAddrMask) &&
272                            isMemAddr(kernelEnd & loadAddrMask))) {
273                fatal("Kernel is mapped to invalid location (not memory). "
274                      "kernelStart 0x(%x) - kernelEnd 0x(%x)\n", kernelStart,
275                      kernelEnd);
276            }
277            // Load program sections into memory
278            kernel->loadSections(physProxy, loadAddrMask);
279
280            DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
281            DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
282            DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
283            DPRINTF(Loader, "Kernel loaded...\n");
284        }
285    }
286
287    activeCpus.clear();
288}
289
290void
291System::replaceThreadContext(ThreadContext *tc, int context_id)
292{
293    if (context_id >= threadContexts.size()) {
294        panic("replaceThreadContext: bad id, %d >= %d\n",
295              context_id, threadContexts.size());
296    }
297
298    threadContexts[context_id] = tc;
299    if (context_id < remoteGDB.size())
300        remoteGDB[context_id]->replaceThreadContext(tc);
301}
302
303Addr
304System::allocPhysPages(int npages)
305{
306    Addr return_addr = pagePtr << LogVMPageSize;
307    pagePtr += npages;
308    if ((pagePtr << LogVMPageSize) > physmem.totalSize())
309        fatal("Out of memory, please increase size of physical memory.");
310    return return_addr;
311}
312
313Addr
314System::memSize() const
315{
316    return physmem.totalSize();
317}
318
319Addr
320System::freeMemSize() const
321{
322   return physmem.totalSize() - (pagePtr << LogVMPageSize);
323}
324
325bool
326System::isMemAddr(Addr addr) const
327{
328    return physmem.isMemAddr(addr);
329}
330
331unsigned int
332System::drain(DrainManager *dm)
333{
334    setDrainState(Drainable::Drained);
335    return 0;
336}
337
338void
339System::drainResume()
340{
341    Drainable::drainResume();
342    totalNumInsts = 0;
343}
344
345void
346System::serialize(ostream &os)
347{
348    if (FullSystem)
349        kernelSymtab->serialize("kernel_symtab", os);
350    SERIALIZE_SCALAR(pagePtr);
351    SERIALIZE_SCALAR(nextPID);
352    serializeSymtab(os);
353
354    // also serialize the memories in the system
355    nameOut(os, csprintf("%s.physmem", name()));
356    physmem.serialize(os);
357}
358
359
360void
361System::unserialize(Checkpoint *cp, const string &section)
362{
363    if (FullSystem)
364        kernelSymtab->unserialize("kernel_symtab", cp, section);
365    UNSERIALIZE_SCALAR(pagePtr);
366    UNSERIALIZE_SCALAR(nextPID);
367    unserializeSymtab(cp, section);
368
369    // also unserialize the memories in the system
370    physmem.unserialize(cp, csprintf("%s.physmem", name()));
371}
372
373void
374System::regStats()
375{
376    for (uint32_t j = 0; j < numWorkIds ; j++) {
377        workItemStats[j] = new Stats::Histogram();
378        stringstream namestr;
379        ccprintf(namestr, "work_item_type%d", j);
380        workItemStats[j]->init(20)
381                         .name(name() + "." + namestr.str())
382                         .desc("Run time stat for" + namestr.str())
383                         .prereq(*workItemStats[j]);
384    }
385}
386
387void
388System::workItemEnd(uint32_t tid, uint32_t workid)
389{
390    std::pair<uint32_t,uint32_t> p(tid, workid);
391    if (!lastWorkItemStarted.count(p))
392        return;
393
394    Tick samp = curTick() - lastWorkItemStarted[p];
395    DPRINTF(WorkItems, "Work item end: %d\t%d\t%lld\n", tid, workid, samp);
396
397    if (workid >= numWorkIds)
398        fatal("Got workid greater than specified in system configuration\n");
399
400    workItemStats[workid]->sample(samp);
401    lastWorkItemStarted.erase(p);
402}
403
404void
405System::printSystems()
406{
407    vector<System *>::iterator i = systemList.begin();
408    vector<System *>::iterator end = systemList.end();
409    for (; i != end; ++i) {
410        System *sys = *i;
411        cerr << "System " << sys->name() << ": " << hex << sys << endl;
412    }
413}
414
415void
416printSystems()
417{
418    System::printSystems();
419}
420
421MasterID
422System::getMasterId(std::string master_name)
423{
424    // strip off system name if the string starts with it
425    if (startswith(master_name, name()))
426        master_name = master_name.erase(0, name().size() + 1);
427
428    // CPUs in switch_cpus ask for ids again after switching
429    for (int i = 0; i < masterIds.size(); i++) {
430        if (masterIds[i] == master_name) {
431            return i;
432        }
433    }
434
435    // Verify that the statistics haven't been enabled yet
436    // Otherwise objects will have sized their stat buckets and
437    // they will be too small
438
439    if (Stats::enabled())
440        fatal("Can't request a masterId after regStats(). \
441                You must do so in init().\n");
442
443    masterIds.push_back(master_name);
444
445    return masterIds.size() - 1;
446}
447
448std::string
449System::getMasterName(MasterID master_id)
450{
451    if (master_id >= masterIds.size())
452        fatal("Invalid master_id passed to getMasterName()\n");
453
454    return masterIds[master_id];
455}
456
457const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
458    "timing"};
459
460System *
461SystemParams::create()
462{
463    return new System(this);
464}
465