system.cc revision 7897:d9e8b1fd1a9f 
1/*
2 * Copyright (c) 2003-2006 The Regents of The University of Michigan
3 * Copyright (c) 2011 Regents of the University of California
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met: redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer;
10 * redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution;
13 * neither the name of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Authors: Steve Reinhardt
30 *          Lisa Hsu
31 *          Nathan Binkert
32 *          Ali Saidi
33 *          Rick Strong
34 */
35
36#include "arch/isa_traits.hh"
37#include "arch/remote_gdb.hh"
38#include "arch/utility.hh"
39#include "base/loader/object_file.hh"
40#include "base/loader/symtab.hh"
41#include "base/trace.hh"
42#include "cpu/thread_context.hh"
43#include "config/full_system.hh"
44#include "config/the_isa.hh"
45#include "mem/mem_object.hh"
46#include "mem/physical.hh"
47#include "sim/byteswap.hh"
48#include "sim/system.hh"
49#include "sim/debug.hh"
50
51#if FULL_SYSTEM
52#include "arch/vtophys.hh"
53#include "kern/kernel_stats.hh"
54#include "mem/vport.hh"
55#else
56#include "params/System.hh"
57#endif
58
59using namespace std;
60using namespace TheISA;
61
62vector<System *> System::systemList;
63
64int System::numSystemsRunning = 0;
65
66System::System(Params *p)
67    : SimObject(p), physmem(p->physmem), _numContexts(0),
68#if FULL_SYSTEM
69      init_param(p->init_param),
70      loadAddrMask(p->load_addr_mask),
71#else
72      pagePtr(0),
73      nextPID(0),
74#endif
75      memoryMode(p->mem_mode), _params(p),
76      totalNumInsts(0),
77      instEventQueue("system instruction-based event queue")
78{
79    // add self to global system list
80    systemList.push_back(this);
81
82#if FULL_SYSTEM
83    kernelSymtab = new SymbolTable;
84    if (!debugSymbolTable)
85        debugSymbolTable = new SymbolTable;
86
87
88    /**
89     * Get a functional port to memory
90     */
91    Port *mem_port;
92    functionalPort = new FunctionalPort(name() + "-fport");
93    mem_port = physmem->getPort("functional");
94    functionalPort->setPeer(mem_port);
95    mem_port->setPeer(functionalPort);
96
97    virtPort = new VirtualPort(name() + "-fport");
98    mem_port = physmem->getPort("functional");
99    virtPort->setPeer(mem_port);
100    mem_port->setPeer(virtPort);
101
102
103    /**
104     * Load the kernel code into memory
105     */
106    if (params()->kernel == "") {
107        inform("No kernel set for full system simulation. Assuming you know what"
108                " you're doing...\n");
109    } else {
110        // Load kernel code
111        kernel = createObjectFile(params()->kernel);
112        inform("kernel located at: %s", params()->kernel);
113
114        if (kernel == NULL)
115            fatal("Could not load kernel file %s", params()->kernel);
116
117        // Load program sections into memory
118        kernel->loadSections(functionalPort, loadAddrMask);
119
120        // setup entry points
121        kernelStart = kernel->textBase();
122        kernelEnd = kernel->bssBase() + kernel->bssSize();
123        kernelEntry = kernel->entryPoint();
124
125        // load symbols
126        if (!kernel->loadGlobalSymbols(kernelSymtab))
127            fatal("could not load kernel symbols\n");
128
129        if (!kernel->loadLocalSymbols(kernelSymtab))
130            fatal("could not load kernel local symbols\n");
131
132        if (!kernel->loadGlobalSymbols(debugSymbolTable))
133            fatal("could not load kernel symbols\n");
134
135        if (!kernel->loadLocalSymbols(debugSymbolTable))
136            fatal("could not load kernel local symbols\n");
137
138        DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
139        DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
140        DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
141        DPRINTF(Loader, "Kernel loaded...\n");
142    }
143#endif // FULL_SYSTEM
144
145    // increment the number of running systms
146    numSystemsRunning++;
147}
148
149System::~System()
150{
151#if FULL_SYSTEM
152    delete kernelSymtab;
153    delete kernel;
154#else
155    panic("System::fixFuncEventAddr needs to be rewritten "
156          "to work with syscall emulation");
157#endif // FULL_SYSTEM}
158}
159
160void
161System::setMemoryMode(Enums::MemoryMode mode)
162{
163    assert(getState() == Drained);
164    memoryMode = mode;
165}
166
167bool System::breakpoint()
168{
169    if (remoteGDB.size())
170        return remoteGDB[0]->breakpoint();
171    return false;
172}
173
174/**
175 * Setting rgdb_wait to a positive integer waits for a remote debugger to
176 * connect to that context ID before continuing.  This should really
177   be a parameter on the CPU object or something...
178 */
179int rgdb_wait = -1;
180
181int
182System::registerThreadContext(ThreadContext *tc, int assigned)
183{
184    int id;
185    if (assigned == -1) {
186        for (id = 0; id < threadContexts.size(); id++) {
187            if (!threadContexts[id])
188                break;
189        }
190
191        if (threadContexts.size() <= id)
192            threadContexts.resize(id + 1);
193    } else {
194        if (threadContexts.size() <= assigned)
195            threadContexts.resize(assigned + 1);
196        id = assigned;
197    }
198
199    if (threadContexts[id])
200        fatal("Cannot have two CPUs with the same id (%d)\n", id);
201
202    threadContexts[id] = tc;
203    _numContexts++;
204
205    int port = getRemoteGDBPort();
206    if (port) {
207        RemoteGDB *rgdb = new RemoteGDB(this, tc);
208        GDBListener *gdbl = new GDBListener(rgdb, port + id);
209        gdbl->listen();
210
211        if (rgdb_wait != -1 && rgdb_wait == id)
212            gdbl->accept();
213
214        if (remoteGDB.size() <= id) {
215            remoteGDB.resize(id + 1);
216        }
217
218        remoteGDB[id] = rgdb;
219    }
220
221    return id;
222}
223
224int
225System::numRunningContexts()
226{
227    int running = 0;
228    for (int i = 0; i < _numContexts; ++i) {
229        if (threadContexts[i]->status() != ThreadContext::Halted)
230            ++running;
231    }
232    return running;
233}
234
235void
236System::initState()
237{
238#if FULL_SYSTEM
239    int i;
240    for (i = 0; i < threadContexts.size(); i++)
241        TheISA::startupCPU(threadContexts[i], i);
242#endif
243}
244
245void
246System::replaceThreadContext(ThreadContext *tc, int context_id)
247{
248    if (context_id >= threadContexts.size()) {
249        panic("replaceThreadContext: bad id, %d >= %d\n",
250              context_id, threadContexts.size());
251    }
252
253    threadContexts[context_id] = tc;
254    if (context_id < remoteGDB.size())
255        remoteGDB[context_id]->replaceThreadContext(tc);
256}
257
258#if !FULL_SYSTEM
259Addr
260System::new_page()
261{
262    Addr return_addr = pagePtr << LogVMPageSize;
263    ++pagePtr;
264    if (return_addr >= physmem->size())
265        fatal("Out of memory, please increase size of physical memory.");
266    return return_addr;
267}
268
269Addr
270System::memSize()
271{
272    return physmem->size();
273}
274
275Addr
276System::freeMemSize()
277{
278   return physmem->size() - (pagePtr << LogVMPageSize);
279}
280
281#endif
282
283void
284System::resume()
285{
286    SimObject::resume();
287    totalNumInsts = 0;
288}
289
290void
291System::serialize(ostream &os)
292{
293#if FULL_SYSTEM
294    kernelSymtab->serialize("kernel_symtab", os);
295#else // !FULL_SYSTEM
296    SERIALIZE_SCALAR(pagePtr);
297    SERIALIZE_SCALAR(nextPID);
298#endif
299}
300
301
302void
303System::unserialize(Checkpoint *cp, const string &section)
304{
305#if FULL_SYSTEM
306    kernelSymtab->unserialize("kernel_symtab", cp, section);
307#else // !FULL_SYSTEM
308    UNSERIALIZE_SCALAR(pagePtr);
309    UNSERIALIZE_SCALAR(nextPID);
310#endif
311}
312
313void
314System::printSystems()
315{
316    vector<System *>::iterator i = systemList.begin();
317    vector<System *>::iterator end = systemList.end();
318    for (; i != end; ++i) {
319        System *sys = *i;
320        cerr << "System " << sys->name() << ": " << hex << sys << endl;
321    }
322}
323
324void
325printSystems()
326{
327    System::printSystems();
328}
329
330const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
331    "timing"};
332
333#if !FULL_SYSTEM
334
335System *
336SystemParams::create()
337{
338    return new System(this);
339}
340
341#endif
342