system.cc revision 7770:6286bb50127e 
1/*
2 * Copyright (c) 2003-2006 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Steve Reinhardt
29 *          Lisa Hsu
30 *          Nathan Binkert
31 *          Ali Saidi
32 */
33
34#include "arch/isa_traits.hh"
35#include "arch/remote_gdb.hh"
36#include "arch/utility.hh"
37#include "base/loader/object_file.hh"
38#include "base/loader/symtab.hh"
39#include "base/trace.hh"
40#include "cpu/thread_context.hh"
41#include "config/full_system.hh"
42#include "config/the_isa.hh"
43#include "mem/mem_object.hh"
44#include "mem/physical.hh"
45#include "sim/byteswap.hh"
46#include "sim/system.hh"
47#include "sim/debug.hh"
48
49#if FULL_SYSTEM
50#include "arch/vtophys.hh"
51#include "kern/kernel_stats.hh"
52#include "mem/vport.hh"
53#else
54#include "params/System.hh"
55#endif
56
57using namespace std;
58using namespace TheISA;
59
60vector<System *> System::systemList;
61
62int System::numSystemsRunning = 0;
63
64System::System(Params *p)
65    : SimObject(p), physmem(p->physmem), _numContexts(0),
66#if FULL_SYSTEM
67      init_param(p->init_param),
68      loadAddrMask(p->load_addr_mask),
69#else
70      pagePtr(0),
71      nextPID(0),
72#endif
73      memoryMode(p->mem_mode), _params(p)
74{
75    // add self to global system list
76    systemList.push_back(this);
77
78#if FULL_SYSTEM
79    kernelSymtab = new SymbolTable;
80    if (!debugSymbolTable)
81        debugSymbolTable = new SymbolTable;
82
83
84    /**
85     * Get a functional port to memory
86     */
87    Port *mem_port;
88    functionalPort = new FunctionalPort(name() + "-fport");
89    mem_port = physmem->getPort("functional");
90    functionalPort->setPeer(mem_port);
91    mem_port->setPeer(functionalPort);
92
93    virtPort = new VirtualPort(name() + "-fport");
94    mem_port = physmem->getPort("functional");
95    virtPort->setPeer(mem_port);
96    mem_port->setPeer(virtPort);
97
98
99    /**
100     * Load the kernel code into memory
101     */
102    if (params()->kernel == "") {
103        inform("No kernel set for full system simulation. Assuming you know what"
104                " you're doing...\n");
105    } else {
106        // Load kernel code
107        kernel = createObjectFile(params()->kernel);
108        inform("kernel located at: %s", params()->kernel);
109
110        if (kernel == NULL)
111            fatal("Could not load kernel file %s", params()->kernel);
112
113        // Load program sections into memory
114        kernel->loadSections(functionalPort, loadAddrMask);
115
116        // setup entry points
117        kernelStart = kernel->textBase();
118        kernelEnd = kernel->bssBase() + kernel->bssSize();
119        kernelEntry = kernel->entryPoint();
120
121        // load symbols
122        if (!kernel->loadGlobalSymbols(kernelSymtab))
123            fatal("could not load kernel symbols\n");
124
125        if (!kernel->loadLocalSymbols(kernelSymtab))
126            fatal("could not load kernel local symbols\n");
127
128        if (!kernel->loadGlobalSymbols(debugSymbolTable))
129            fatal("could not load kernel symbols\n");
130
131        if (!kernel->loadLocalSymbols(debugSymbolTable))
132            fatal("could not load kernel local symbols\n");
133
134        DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
135        DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
136        DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
137        DPRINTF(Loader, "Kernel loaded...\n");
138    }
139#endif // FULL_SYSTEM
140
141    // increment the number of running systms
142    numSystemsRunning++;
143}
144
145System::~System()
146{
147#if FULL_SYSTEM
148    delete kernelSymtab;
149    delete kernel;
150#else
151    panic("System::fixFuncEventAddr needs to be rewritten "
152          "to work with syscall emulation");
153#endif // FULL_SYSTEM}
154}
155
156void
157System::setMemoryMode(Enums::MemoryMode mode)
158{
159    assert(getState() == Drained);
160    memoryMode = mode;
161}
162
163bool System::breakpoint()
164{
165    if (remoteGDB.size())
166        return remoteGDB[0]->breakpoint();
167    return false;
168}
169
170/**
171 * Setting rgdb_wait to a positive integer waits for a remote debugger to
172 * connect to that context ID before continuing.  This should really
173   be a parameter on the CPU object or something...
174 */
175int rgdb_wait = -1;
176
177int
178System::registerThreadContext(ThreadContext *tc, int assigned)
179{
180    int id;
181    if (assigned == -1) {
182        for (id = 0; id < threadContexts.size(); id++) {
183            if (!threadContexts[id])
184                break;
185        }
186
187        if (threadContexts.size() <= id)
188            threadContexts.resize(id + 1);
189    } else {
190        if (threadContexts.size() <= assigned)
191            threadContexts.resize(assigned + 1);
192        id = assigned;
193    }
194
195    if (threadContexts[id])
196        fatal("Cannot have two CPUs with the same id (%d)\n", id);
197
198    threadContexts[id] = tc;
199    _numContexts++;
200
201    int port = getRemoteGDBPort();
202    if (port) {
203        RemoteGDB *rgdb = new RemoteGDB(this, tc);
204        GDBListener *gdbl = new GDBListener(rgdb, port + id);
205        gdbl->listen();
206
207        if (rgdb_wait != -1 && rgdb_wait == id)
208            gdbl->accept();
209
210        if (remoteGDB.size() <= id) {
211            remoteGDB.resize(id + 1);
212        }
213
214        remoteGDB[id] = rgdb;
215    }
216
217    return id;
218}
219
220int
221System::numRunningContexts()
222{
223    int running = 0;
224    for (int i = 0; i < _numContexts; ++i) {
225        if (threadContexts[i]->status() != ThreadContext::Halted)
226            ++running;
227    }
228    return running;
229}
230
231void
232System::initState()
233{
234#if FULL_SYSTEM
235    int i;
236    for (i = 0; i < threadContexts.size(); i++)
237        TheISA::startupCPU(threadContexts[i], i);
238#endif
239}
240
241void
242System::replaceThreadContext(ThreadContext *tc, int context_id)
243{
244    if (context_id >= threadContexts.size()) {
245        panic("replaceThreadContext: bad id, %d >= %d\n",
246              context_id, threadContexts.size());
247    }
248
249    threadContexts[context_id] = tc;
250    if (context_id < remoteGDB.size())
251        remoteGDB[context_id]->replaceThreadContext(tc);
252}
253
254#if !FULL_SYSTEM
255Addr
256System::new_page()
257{
258    Addr return_addr = pagePtr << LogVMPageSize;
259    ++pagePtr;
260    if (return_addr >= physmem->size())
261        fatal("Out of memory, please increase size of physical memory.");
262    return return_addr;
263}
264
265Addr
266System::memSize()
267{
268    return physmem->size();
269}
270
271Addr
272System::freeMemSize()
273{
274   return physmem->size() - (pagePtr << LogVMPageSize);
275}
276
277#endif
278
279void
280System::serialize(ostream &os)
281{
282#if FULL_SYSTEM
283    kernelSymtab->serialize("kernel_symtab", os);
284#else // !FULL_SYSTEM
285    SERIALIZE_SCALAR(pagePtr);
286    SERIALIZE_SCALAR(nextPID);
287#endif
288}
289
290
291void
292System::unserialize(Checkpoint *cp, const string &section)
293{
294#if FULL_SYSTEM
295    kernelSymtab->unserialize("kernel_symtab", cp, section);
296#else // !FULL_SYSTEM
297    UNSERIALIZE_SCALAR(pagePtr);
298    UNSERIALIZE_SCALAR(nextPID);
299#endif
300}
301
302void
303System::printSystems()
304{
305    vector<System *>::iterator i = systemList.begin();
306    vector<System *>::iterator end = systemList.end();
307    for (; i != end; ++i) {
308        System *sys = *i;
309        cerr << "System " << sys->name() << ": " << hex << sys << endl;
310    }
311}
312
313void
314printSystems()
315{
316    System::printSystems();
317}
318
319const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
320    "timing"};
321
322#if !FULL_SYSTEM
323
324System *
325SystemParams::create()
326{
327    return new System(this);
328}
329
330#endif
331