system.cc revision 4194 
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/builder.hh"
44#include "sim/byteswap.hh"
45#include "sim/system.hh"
46#if FULL_SYSTEM
47#include "arch/vtophys.hh"
48#include "kern/kernel_stats.hh"
49#endif
50
51using namespace std;
52using namespace TheISA;
53
54vector<System *> System::systemList;
55
56int System::numSystemsRunning = 0;
57
58System::System(Params *p)
59    : SimObject(p->name), physmem(p->physmem), numcpus(0),
60#if FULL_SYSTEM
61      init_param(p->init_param),
62      functionalPort(p->name + "-fport"),
63      virtPort(p->name + "-vport"),
64#else
65      page_ptr(0),
66#endif
67      memoryMode(p->mem_mode), _params(p)
68{
69    // add self to global system list
70    systemList.push_back(this);
71
72#if FULL_SYSTEM
73    kernelSymtab = new SymbolTable;
74    debugSymbolTable = new SymbolTable;
75
76
77    /**
78     * Get a functional port to memory
79     */
80    Port *mem_port;
81    mem_port = physmem->getPort("functional");
82    functionalPort.setPeer(mem_port);
83    mem_port->setPeer(&functionalPort);
84
85    mem_port = physmem->getPort("functional");
86    virtPort.setPeer(mem_port);
87    mem_port->setPeer(&virtPort);
88
89
90    /**
91     * Load the kernel code into memory
92     */
93    if (params()->kernel_path == "") {
94        warn("No kernel set for full system simulation. Assuming you know what"
95                " you're doing...\n");
96    } else {
97        // Load kernel code
98        kernel = createObjectFile(params()->kernel_path);
99        if (kernel == NULL)
100            fatal("Could not load kernel file %s", params()->kernel_path);
101
102        // Load program sections into memory
103        kernel->loadSections(&functionalPort, LoadAddrMask);
104
105        // setup entry points
106        kernelStart = kernel->textBase();
107        kernelEnd = kernel->bssBase() + kernel->bssSize();
108        kernelEntry = kernel->entryPoint();
109
110        // load symbols
111        if (!kernel->loadGlobalSymbols(kernelSymtab))
112            panic("could not load kernel symbols\n");
113
114        if (!kernel->loadLocalSymbols(kernelSymtab))
115            panic("could not load kernel local symbols\n");
116
117        if (!kernel->loadGlobalSymbols(debugSymbolTable))
118            panic("could not load kernel symbols\n");
119
120        if (!kernel->loadLocalSymbols(debugSymbolTable))
121            panic("could not load kernel local symbols\n");
122
123        DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
124        DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
125        DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
126        DPRINTF(Loader, "Kernel loaded...\n");
127    }
128#endif // FULL_SYSTEM
129
130    // increment the number of running systms
131    numSystemsRunning++;
132}
133
134System::~System()
135{
136#if FULL_SYSTEM
137    delete kernelSymtab;
138    delete kernel;
139#else
140    panic("System::fixFuncEventAddr needs to be rewritten "
141          "to work with syscall emulation");
142#endif // FULL_SYSTEM}
143}
144
145int rgdb_wait = -1;
146int rgdb_enable = true;
147
148void
149System::setMemoryMode(MemoryMode mode)
150{
151    assert(getState() == Drained);
152    memoryMode = mode;
153}
154
155bool System::breakpoint()
156{
157    if (remoteGDB.size())
158        return remoteGDB[0]->breakpoint();
159    return false;
160}
161
162int
163System::registerThreadContext(ThreadContext *tc, int id)
164{
165    if (id == -1) {
166        for (id = 0; id < threadContexts.size(); id++) {
167            if (!threadContexts[id])
168                break;
169        }
170    }
171
172    if (threadContexts.size() <= id)
173        threadContexts.resize(id + 1);
174
175    if (threadContexts[id])
176        panic("Cannot have two CPUs with the same id (%d)\n", id);
177
178    threadContexts[id] = tc;
179    numcpus++;
180
181    if (rgdb_enable) {
182        RemoteGDB *rgdb = new RemoteGDB(this, tc);
183        GDBListener *gdbl = new GDBListener(rgdb, 7000 + id);
184        gdbl->listen();
185        /**
186         * Uncommenting this line waits for a remote debugger to
187         * connect to the simulator before continuing.
188         */
189        if (rgdb_wait != -1 && rgdb_wait == id)
190            gdbl->accept();
191
192        if (remoteGDB.size() <= id) {
193            remoteGDB.resize(id + 1);
194        }
195
196        remoteGDB[id] = rgdb;
197    }
198
199    return id;
200}
201
202void
203System::startup()
204{
205    int i;
206    for (i = 0; i < threadContexts.size(); i++)
207        TheISA::startupCPU(threadContexts[i], i);
208}
209
210void
211System::replaceThreadContext(ThreadContext *tc, int id)
212{
213    if (id >= threadContexts.size()) {
214        panic("replaceThreadContext: bad id, %d >= %d\n",
215              id, threadContexts.size());
216    }
217
218    threadContexts[id] = tc;
219    if (id < remoteGDB.size())
220        remoteGDB[id]->replaceThreadContext(tc);
221}
222
223#if !FULL_SYSTEM
224Addr
225System::new_page()
226{
227    Addr return_addr = page_ptr << LogVMPageSize;
228    ++page_ptr;
229    if (return_addr >= physmem->size())
230        fatal("Out of memory, please increase size of physical memory.");
231    return return_addr;
232}
233#endif
234
235void
236System::serialize(ostream &os)
237{
238#if FULL_SYSTEM
239    kernelSymtab->serialize("kernel_symtab", os);
240#endif // FULL_SYSTEM
241}
242
243
244void
245System::unserialize(Checkpoint *cp, const string &section)
246{
247#if FULL_SYSTEM
248    kernelSymtab->unserialize("kernel_symtab", cp, section);
249#endif // FULL_SYSTEM
250}
251
252void
253System::printSystems()
254{
255    vector<System *>::iterator i = systemList.begin();
256    vector<System *>::iterator end = systemList.end();
257    for (; i != end; ++i) {
258        System *sys = *i;
259        cerr << "System " << sys->name() << ": " << hex << sys << endl;
260    }
261}
262
263void
264printSystems()
265{
266    System::printSystems();
267}
268
269const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
270    "timing"};
271
272#if FULL_SYSTEM
273
274// In full system mode, only derived classes (e.g. AlphaLinuxSystem)
275// can be created directly.
276
277DEFINE_SIM_OBJECT_CLASS_NAME("System", System)
278
279#else
280
281BEGIN_DECLARE_SIM_OBJECT_PARAMS(System)
282
283    SimObjectParam<PhysicalMemory *> physmem;
284    SimpleEnumParam<System::MemoryMode> mem_mode;
285
286END_DECLARE_SIM_OBJECT_PARAMS(System)
287
288BEGIN_INIT_SIM_OBJECT_PARAMS(System)
289
290    INIT_PARAM(physmem, "physical memory"),
291    INIT_ENUM_PARAM(mem_mode, "Memory Mode, (1=atomic, 2=timing)",
292            System::MemoryModeStrings)
293
294END_INIT_SIM_OBJECT_PARAMS(System)
295
296CREATE_SIM_OBJECT(System)
297{
298    System::Params *p = new System::Params;
299    p->name = getInstanceName();
300    p->physmem = physmem;
301    p->mem_mode = mem_mode;
302    return new System(p);
303}
304
305REGISTER_SIM_OBJECT("System", System)
306
307#endif
308