system.cc revision 7445 
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#else
53#include "params/System.hh"
54#endif
55
56using namespace std;
57using namespace TheISA;
58
59vector<System *> System::systemList;
60
61int System::numSystemsRunning = 0;
62
63System::System(Params *p)
64    : SimObject(p), physmem(p->physmem), _numContexts(0),
65#if FULL_SYSTEM
66      init_param(p->init_param),
67      functionalPort(p->name + "-fport"),
68      virtPort(p->name + "-vport"),
69#else
70      page_ptr(0),
71      next_PID(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    mem_port = physmem->getPort("functional");
89    functionalPort.setPeer(mem_port);
90    mem_port->setPeer(&functionalPort);
91
92    mem_port = physmem->getPort("functional");
93    virtPort.setPeer(mem_port);
94    mem_port->setPeer(&virtPort);
95
96
97    /**
98     * Load the kernel code into memory
99     */
100    if (params()->kernel == "") {
101        inform("No kernel set for full system simulation. Assuming you know what"
102                " you're doing...\n");
103    } else {
104        // Load kernel code
105        kernel = createObjectFile(params()->kernel);
106        inform("kernel located at: %s", params()->kernel);
107
108        if (kernel == NULL)
109            fatal("Could not load kernel file %s", params()->kernel);
110
111        // Load program sections into memory
112        kernel->loadSections(&functionalPort, LoadAddrMask);
113
114        // setup entry points
115        kernelStart = kernel->textBase();
116        kernelEnd = kernel->bssBase() + kernel->bssSize();
117        kernelEntry = kernel->entryPoint();
118
119        // load symbols
120        if (!kernel->loadGlobalSymbols(kernelSymtab))
121            fatal("could not load kernel symbols\n");
122
123        if (!kernel->loadLocalSymbols(kernelSymtab))
124            fatal("could not load kernel local symbols\n");
125
126        if (!kernel->loadGlobalSymbols(debugSymbolTable))
127            fatal("could not load kernel symbols\n");
128
129        if (!kernel->loadLocalSymbols(debugSymbolTable))
130            fatal("could not load kernel local symbols\n");
131
132        DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
133        DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
134        DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
135        DPRINTF(Loader, "Kernel loaded...\n");
136    }
137#endif // FULL_SYSTEM
138
139    // increment the number of running systms
140    numSystemsRunning++;
141}
142
143System::~System()
144{
145#if FULL_SYSTEM
146    delete kernelSymtab;
147    delete kernel;
148#else
149    panic("System::fixFuncEventAddr needs to be rewritten "
150          "to work with syscall emulation");
151#endif // FULL_SYSTEM}
152}
153
154void
155System::setMemoryMode(Enums::MemoryMode mode)
156{
157    assert(getState() == Drained);
158    memoryMode = mode;
159}
160
161bool System::breakpoint()
162{
163    if (remoteGDB.size())
164        return remoteGDB[0]->breakpoint();
165    return false;
166}
167
168/**
169 * Setting rgdb_wait to a positive integer waits for a remote debugger to
170 * connect to that context ID before continuing.  This should really
171   be a parameter on the CPU object or something...
172 */
173int rgdb_wait = -1;
174
175int
176System::registerThreadContext(ThreadContext *tc, int assigned)
177{
178    int id;
179    if (assigned == -1) {
180        for (id = 0; id < threadContexts.size(); id++) {
181            if (!threadContexts[id])
182                break;
183        }
184
185        if (threadContexts.size() <= id)
186            threadContexts.resize(id + 1);
187    } else {
188        if (threadContexts.size() <= assigned)
189            threadContexts.resize(assigned + 1);
190        id = assigned;
191    }
192
193    if (threadContexts[id])
194        fatal("Cannot have two CPUs with the same id (%d)\n", id);
195
196    threadContexts[id] = tc;
197    _numContexts++;
198
199    int port = getRemoteGDBPort();
200    if (port) {
201        RemoteGDB *rgdb = new RemoteGDB(this, tc);
202        GDBListener *gdbl = new GDBListener(rgdb, port + id);
203        gdbl->listen();
204
205        if (rgdb_wait != -1 && rgdb_wait == id)
206            gdbl->accept();
207
208        if (remoteGDB.size() <= id) {
209            remoteGDB.resize(id + 1);
210        }
211
212        remoteGDB[id] = rgdb;
213    }
214
215    return id;
216}
217
218int
219System::numRunningContexts()
220{
221    int running = 0;
222    for (int i = 0; i < _numContexts; ++i) {
223        if (threadContexts[i]->status() != ThreadContext::Halted)
224            ++running;
225    }
226    return running;
227}
228
229void
230System::startup()
231{
232#if FULL_SYSTEM
233    int i;
234    for (i = 0; i < threadContexts.size(); i++)
235        TheISA::startupCPU(threadContexts[i], i);
236#endif
237}
238
239void
240System::replaceThreadContext(ThreadContext *tc, int context_id)
241{
242    if (context_id >= threadContexts.size()) {
243        panic("replaceThreadContext: bad id, %d >= %d\n",
244              context_id, threadContexts.size());
245    }
246
247    threadContexts[context_id] = tc;
248    if (context_id < remoteGDB.size())
249        remoteGDB[context_id]->replaceThreadContext(tc);
250}
251
252#if !FULL_SYSTEM
253Addr
254System::new_page()
255{
256    Addr return_addr = page_ptr << LogVMPageSize;
257    ++page_ptr;
258    if (return_addr >= physmem->size())
259        fatal("Out of memory, please increase size of physical memory.");
260    return return_addr;
261}
262
263Addr
264System::memSize()
265{
266    return physmem->size();
267}
268
269Addr
270System::freeMemSize()
271{
272   return physmem->size() - (page_ptr << LogVMPageSize);
273}
274
275#endif
276
277void
278System::serialize(ostream &os)
279{
280#if FULL_SYSTEM
281    kernelSymtab->serialize("kernel_symtab", os);
282#else // !FULL_SYSTEM
283    SERIALIZE_SCALAR(page_ptr);
284#endif
285}
286
287
288void
289System::unserialize(Checkpoint *cp, const string &section)
290{
291#if FULL_SYSTEM
292    kernelSymtab->unserialize("kernel_symtab", cp, section);
293#else // !FULL_SYSTEM
294    UNSERIALIZE_SCALAR(page_ptr);
295#endif
296}
297
298void
299System::printSystems()
300{
301    vector<System *>::iterator i = systemList.begin();
302    vector<System *>::iterator end = systemList.end();
303    for (; i != end; ++i) {
304        System *sys = *i;
305        cerr << "System " << sys->name() << ": " << hex << sys << endl;
306    }
307}
308
309void
310printSystems()
311{
312    System::printSystems();
313}
314
315const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
316    "timing"};
317
318#if !FULL_SYSTEM
319
320System *
321SystemParams::create()
322{
323    return new System(this);
324}
325
326#endif
327