system.cc revision 5222 
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 "mem/mem_object.hh"
42#include "mem/physical.hh"
43#include "sim/byteswap.hh"
44#include "sim/system.hh"
45#if FULL_SYSTEM
46#include "arch/vtophys.hh"
47#include "kern/kernel_stats.hh"
48#else
49#include "params/System.hh"
50#endif
51
52using namespace std;
53using namespace TheISA;
54
55vector<System *> System::systemList;
56
57int System::numSystemsRunning = 0;
58
59System::System(Params *p)
60    : SimObject(p), physmem(p->physmem), numcpus(0),
61#if FULL_SYSTEM
62      init_param(p->init_param),
63      functionalPort(p->name + "-fport"),
64      virtPort(p->name + "-vport"),
65#else
66      page_ptr(0),
67      next_PID(0),
68#endif
69      memoryMode(p->mem_mode), _params(p)
70{
71    // add self to global system list
72    systemList.push_back(this);
73
74#if FULL_SYSTEM
75    kernelSymtab = new SymbolTable;
76    if (!debugSymbolTable)
77        debugSymbolTable = new SymbolTable;
78
79
80    /**
81     * Get a functional port to memory
82     */
83    Port *mem_port;
84    mem_port = physmem->getPort("functional");
85    functionalPort.setPeer(mem_port);
86    mem_port->setPeer(&functionalPort);
87
88    mem_port = physmem->getPort("functional");
89    virtPort.setPeer(mem_port);
90    mem_port->setPeer(&virtPort);
91
92
93    /**
94     * Load the kernel code into memory
95     */
96    if (params()->kernel == "") {
97        warn("No kernel set for full system simulation. Assuming you know what"
98                " you're doing...\n");
99    } else {
100        // Load kernel code
101        kernel = createObjectFile(params()->kernel);
102        warn("kernel located at: %s", params()->kernel);
103
104        if (kernel == NULL)
105            fatal("Could not load kernel file %s", params()->kernel);
106
107        // Load program sections into memory
108        kernel->loadSections(&functionalPort, LoadAddrMask);
109
110        // setup entry points
111        kernelStart = kernel->textBase();
112        kernelEnd = kernel->bssBase() + kernel->bssSize();
113        kernelEntry = kernel->entryPoint();
114
115        // load symbols
116        if (!kernel->loadGlobalSymbols(kernelSymtab))
117            panic("could not load kernel symbols\n");
118
119        if (!kernel->loadLocalSymbols(kernelSymtab))
120            panic("could not load kernel local symbols\n");
121
122        if (!kernel->loadGlobalSymbols(debugSymbolTable))
123            panic("could not load kernel symbols\n");
124
125        if (!kernel->loadLocalSymbols(debugSymbolTable))
126            panic("could not load kernel local symbols\n");
127
128        DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
129        DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
130        DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
131        DPRINTF(Loader, "Kernel loaded...\n");
132    }
133#endif // FULL_SYSTEM
134
135    // increment the number of running systms
136    numSystemsRunning++;
137}
138
139System::~System()
140{
141#if FULL_SYSTEM
142    delete kernelSymtab;
143    delete kernel;
144#else
145    panic("System::fixFuncEventAddr needs to be rewritten "
146          "to work with syscall emulation");
147#endif // FULL_SYSTEM}
148}
149
150int rgdb_wait = -1;
151int rgdb_enable = true;
152
153void
154System::setMemoryMode(Enums::MemoryMode mode)
155{
156    assert(getState() == Drained);
157    memoryMode = mode;
158}
159
160bool System::breakpoint()
161{
162    if (remoteGDB.size())
163        return remoteGDB[0]->breakpoint();
164    return false;
165}
166
167int
168System::registerThreadContext(ThreadContext *tc, int id)
169{
170    if (id == -1) {
171        for (id = 0; id < threadContexts.size(); id++) {
172            if (!threadContexts[id])
173                break;
174        }
175    }
176
177    if (threadContexts.size() <= id)
178        threadContexts.resize(id + 1);
179
180    if (threadContexts[id])
181        panic("Cannot have two CPUs with the same id (%d)\n", id);
182
183    threadContexts[id] = tc;
184    numcpus++;
185
186    if (rgdb_enable) {
187        RemoteGDB *rgdb = new RemoteGDB(this, tc);
188        GDBListener *gdbl = new GDBListener(rgdb, 7000 + id);
189        gdbl->listen();
190        /**
191         * Uncommenting this line waits for a remote debugger to
192         * connect to the simulator before continuing.
193         */
194        if (rgdb_wait != -1 && rgdb_wait == id)
195            gdbl->accept();
196
197        if (remoteGDB.size() <= id) {
198            remoteGDB.resize(id + 1);
199        }
200
201        remoteGDB[id] = rgdb;
202    }
203
204    return id;
205}
206
207void
208System::startup()
209{
210    int i;
211    for (i = 0; i < threadContexts.size(); i++)
212        TheISA::startupCPU(threadContexts[i], i);
213}
214
215void
216System::replaceThreadContext(ThreadContext *tc, int id)
217{
218    if (id >= threadContexts.size()) {
219        panic("replaceThreadContext: bad id, %d >= %d\n",
220              id, threadContexts.size());
221    }
222
223    threadContexts[id] = tc;
224    if (id < remoteGDB.size())
225        remoteGDB[id]->replaceThreadContext(tc);
226}
227
228#if !FULL_SYSTEM
229Addr
230System::new_page()
231{
232    Addr return_addr = page_ptr << LogVMPageSize;
233    ++page_ptr;
234    if (return_addr >= physmem->size())
235        fatal("Out of memory, please increase size of physical memory.");
236    return return_addr;
237}
238#endif
239
240void
241System::serialize(ostream &os)
242{
243#if FULL_SYSTEM
244    kernelSymtab->serialize("kernel_symtab", os);
245#else // !FULL_SYSTEM
246    SERIALIZE_SCALAR(page_ptr);
247#endif
248}
249
250
251void
252System::unserialize(Checkpoint *cp, const string &section)
253{
254#if FULL_SYSTEM
255    kernelSymtab->unserialize("kernel_symtab", cp, section);
256#else // !FULL_SYSTEM
257    UNSERIALIZE_SCALAR(page_ptr);
258#endif
259}
260
261void
262System::printSystems()
263{
264    vector<System *>::iterator i = systemList.begin();
265    vector<System *>::iterator end = systemList.end();
266    for (; i != end; ++i) {
267        System *sys = *i;
268        cerr << "System " << sys->name() << ": " << hex << sys << endl;
269    }
270}
271
272void
273printSystems()
274{
275    System::printSystems();
276}
277
278const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
279    "timing"};
280
281#if !FULL_SYSTEM
282
283System *
284SystemParams::create()
285{
286    System::Params *p = new System::Params;
287    p->name = name;
288    p->physmem = physmem;
289    p->mem_mode = mem_mode;
290    return new System(p);
291}
292
293#endif
294