system.cc revision 3812 
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 "base/loader/object_file.hh"
36#include "base/loader/symtab.hh"
37#include "base/trace.hh"
38#include "cpu/thread_context.hh"
39#include "mem/mem_object.hh"
40#include "mem/physical.hh"
41#include "sim/builder.hh"
42#include "sim/byteswap.hh"
43#include "sim/system.hh"
44#if FULL_SYSTEM
45#include "arch/vtophys.hh"
46#include "arch/remote_gdb.hh"
47#include "kern/kernel_stats.hh"
48#endif
49
50using namespace std;
51using namespace TheISA;
52
53vector<System *> System::systemList;
54
55int System::numSystemsRunning = 0;
56
57System::System(Params *p)
58    : SimObject(p->name), physmem(p->physmem), numcpus(0),
59#if FULL_SYSTEM
60      init_param(p->init_param),
61      functionalPort(p->name + "-fport"),
62      virtPort(p->name + "-vport"),
63#else
64      page_ptr(0),
65#endif
66      memoryMode(p->mem_mode), _params(p)
67{
68    // add self to global system list
69    systemList.push_back(this);
70
71#if FULL_SYSTEM
72    kernelSymtab = new SymbolTable;
73    debugSymbolTable = new SymbolTable;
74
75
76    /**
77     * Get a functional port to memory
78     */
79    Port *mem_port;
80    mem_port = physmem->getPort("functional");
81    functionalPort.setPeer(mem_port);
82    mem_port->setPeer(&functionalPort);
83
84    mem_port = physmem->getPort("functional");
85    virtPort.setPeer(mem_port);
86    mem_port->setPeer(&virtPort);
87
88
89    /**
90     * Load the kernel code into memory
91     */
92    if (params()->kernel_path == "") {
93        warn("No kernel set for full system simulation. Assuming you know what"
94                " you're doing...\n");
95    } else {
96        // Load kernel code
97        kernel = createObjectFile(params()->kernel_path);
98        if (kernel == NULL)
99            fatal("Could not load kernel file %s", params()->kernel_path);
100
101        // Load program sections into memory
102        kernel->loadSections(&functionalPort, LoadAddrMask);
103
104        // setup entry points
105        kernelStart = kernel->textBase();
106        kernelEnd = kernel->bssBase() + kernel->bssSize();
107        kernelEntry = kernel->entryPoint();
108
109        // load symbols
110        if (!kernel->loadGlobalSymbols(kernelSymtab))
111            panic("could not load kernel symbols\n");
112
113        if (!kernel->loadLocalSymbols(kernelSymtab))
114            panic("could not load kernel local symbols\n");
115
116        if (!kernel->loadGlobalSymbols(debugSymbolTable))
117            panic("could not load kernel symbols\n");
118
119        if (!kernel->loadLocalSymbols(debugSymbolTable))
120            panic("could not load kernel local symbols\n");
121
122        DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
123        DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
124        DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
125        DPRINTF(Loader, "Kernel loaded...\n");
126    }
127#endif // FULL_SYSTEM
128
129    // increment the number of running systms
130    numSystemsRunning++;
131}
132
133System::~System()
134{
135#if FULL_SYSTEM
136    delete kernelSymtab;
137    delete kernel;
138#else
139    panic("System::fixFuncEventAddr needs to be rewritten "
140          "to work with syscall emulation");
141#endif // FULL_SYSTEM}
142}
143
144#if FULL_SYSTEM
145
146
147int rgdb_wait = -1;
148
149#endif // FULL_SYSTEM
150
151
152void
153System::setMemoryMode(MemoryMode mode)
154{
155    assert(getState() == Drained);
156    memoryMode = mode;
157}
158
159int
160System::registerThreadContext(ThreadContext *tc, int id)
161{
162    if (id == -1) {
163        for (id = 0; id < threadContexts.size(); id++) {
164            if (!threadContexts[id])
165                break;
166        }
167    }
168
169    if (threadContexts.size() <= id)
170        threadContexts.resize(id + 1);
171
172    if (threadContexts[id])
173        panic("Cannot have two CPUs with the same id (%d)\n", id);
174
175    threadContexts[id] = tc;
176    numcpus++;
177
178#if FULL_SYSTEM
179    RemoteGDB *rgdb = new RemoteGDB(this, tc);
180    GDBListener *gdbl = new GDBListener(rgdb, 7000 + id);
181    gdbl->listen();
182    /**
183     * Uncommenting this line waits for a remote debugger to connect
184     * to the simulator before continuing.
185     */
186    if (rgdb_wait != -1 && rgdb_wait == id)
187        gdbl->accept();
188
189    if (remoteGDB.size() <= id) {
190        remoteGDB.resize(id + 1);
191    }
192
193    remoteGDB[id] = rgdb;
194#endif // FULL_SYSTEM
195
196    return id;
197}
198
199void
200System::startup()
201{
202    int i;
203    for (i = 0; i < threadContexts.size(); i++)
204        threadContexts[i]->activate(0);
205}
206
207void
208System::replaceThreadContext(ThreadContext *tc, int id)
209{
210    if (id >= threadContexts.size()) {
211        panic("replaceThreadContext: bad id, %d >= %d\n",
212              id, threadContexts.size());
213    }
214
215    threadContexts[id] = tc;
216#if FULL_SYSTEM
217    remoteGDB[id]->replaceThreadContext(tc);
218#endif // FULL_SYSTEM
219}
220
221#if !FULL_SYSTEM
222Addr
223System::new_page()
224{
225    Addr return_addr = page_ptr << LogVMPageSize;
226    ++page_ptr;
227    if (return_addr >= physmem->size())
228        fatal("Out of memory, please increase size of physical memory.");
229    return return_addr;
230}
231#endif
232
233void
234System::serialize(ostream &os)
235{
236#if FULL_SYSTEM
237    kernelSymtab->serialize("kernel_symtab", os);
238#endif // FULL_SYSTEM
239}
240
241
242void
243System::unserialize(Checkpoint *cp, const string &section)
244{
245#if FULL_SYSTEM
246    kernelSymtab->unserialize("kernel_symtab", cp, section);
247#endif // FULL_SYSTEM
248}
249
250void
251System::printSystems()
252{
253    vector<System *>::iterator i = systemList.begin();
254    vector<System *>::iterator end = systemList.end();
255    for (; i != end; ++i) {
256        System *sys = *i;
257        cerr << "System " << sys->name() << ": " << hex << sys << endl;
258    }
259}
260
261void
262printSystems()
263{
264    System::printSystems();
265}
266
267const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
268    "timing"};
269
270#if FULL_SYSTEM
271
272// In full system mode, only derived classes (e.g. AlphaLinuxSystem)
273// can be created directly.
274
275DEFINE_SIM_OBJECT_CLASS_NAME("System", System)
276
277#else
278
279BEGIN_DECLARE_SIM_OBJECT_PARAMS(System)
280
281    SimObjectParam<PhysicalMemory *> physmem;
282    SimpleEnumParam<System::MemoryMode> mem_mode;
283
284END_DECLARE_SIM_OBJECT_PARAMS(System)
285
286BEGIN_INIT_SIM_OBJECT_PARAMS(System)
287
288    INIT_PARAM(physmem, "physical memory"),
289    INIT_ENUM_PARAM(mem_mode, "Memory Mode, (1=atomic, 2=timing)",
290            System::MemoryModeStrings)
291
292END_INIT_SIM_OBJECT_PARAMS(System)
293
294CREATE_SIM_OBJECT(System)
295{
296    System::Params *p = new System::Params;
297    p->name = getInstanceName();
298    p->physmem = physmem;
299    p->mem_mode = mem_mode;
300    return new System(p);
301}
302
303REGISTER_SIM_OBJECT("System", System)
304
305#endif
306