system.cc revision 3536 
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    // Load kernel code
93    kernel = createObjectFile(params()->kernel_path);
94    if (kernel == NULL)
95        fatal("Could not load kernel file %s", params()->kernel_path);
96
97    // Load program sections into memory
98    kernel->loadSections(&functionalPort, LoadAddrMask);
99
100    // setup entry points
101    kernelStart = kernel->textBase();
102    kernelEnd = kernel->bssBase() + kernel->bssSize();
103    kernelEntry = kernel->entryPoint();
104
105    // load symbols
106    if (!kernel->loadGlobalSymbols(kernelSymtab))
107        panic("could not load kernel symbols\n");
108
109    if (!kernel->loadLocalSymbols(kernelSymtab))
110        panic("could not load kernel local symbols\n");
111
112    if (!kernel->loadGlobalSymbols(debugSymbolTable))
113        panic("could not load kernel symbols\n");
114
115    if (!kernel->loadLocalSymbols(debugSymbolTable))
116        panic("could not load kernel local symbols\n");
117
118    DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
119    DPRINTF(Loader, "Kernel end   = %#x\n", kernelEnd);
120    DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
121    DPRINTF(Loader, "Kernel loaded...\n");
122#endif // FULL_SYSTEM
123
124    // increment the number of running systms
125    numSystemsRunning++;
126}
127
128System::~System()
129{
130#if FULL_SYSTEM
131    delete kernelSymtab;
132    delete kernel;
133#else
134    panic("System::fixFuncEventAddr needs to be rewritten "
135          "to work with syscall emulation");
136#endif // FULL_SYSTEM}
137}
138
139#if FULL_SYSTEM
140
141
142int rgdb_wait = -1;
143
144#endif // FULL_SYSTEM
145
146
147void
148System::setMemoryMode(MemoryMode mode)
149{
150    assert(getState() == Drained);
151    memoryMode = mode;
152}
153
154int
155System::registerThreadContext(ThreadContext *tc, int id)
156{
157    if (id == -1) {
158        for (id = 0; id < threadContexts.size(); id++) {
159            if (!threadContexts[id])
160                break;
161        }
162    }
163
164    if (threadContexts.size() <= id)
165        threadContexts.resize(id + 1);
166
167    if (threadContexts[id])
168        panic("Cannot have two CPUs with the same id (%d)\n", id);
169
170    threadContexts[id] = tc;
171    numcpus++;
172
173#if FULL_SYSTEM
174    RemoteGDB *rgdb = new RemoteGDB(this, tc);
175    GDBListener *gdbl = new GDBListener(rgdb, 7000 + id);
176    gdbl->listen();
177    /**
178     * Uncommenting this line waits for a remote debugger to connect
179     * to the simulator before continuing.
180     */
181    if (rgdb_wait != -1 && rgdb_wait == id)
182        gdbl->accept();
183
184    if (remoteGDB.size() <= id) {
185        remoteGDB.resize(id + 1);
186    }
187
188    remoteGDB[id] = rgdb;
189#endif // FULL_SYSTEM
190
191    return id;
192}
193
194void
195System::startup()
196{
197    int i;
198    for (i = 0; i < threadContexts.size(); i++)
199        threadContexts[i]->activate(0);
200}
201
202void
203System::replaceThreadContext(ThreadContext *tc, int id)
204{
205    if (id >= threadContexts.size()) {
206        panic("replaceThreadContext: bad id, %d >= %d\n",
207              id, threadContexts.size());
208    }
209
210    threadContexts[id] = tc;
211#if FULL_SYSTEM
212    remoteGDB[id]->replaceThreadContext(tc);
213#endif // FULL_SYSTEM
214}
215
216#if !FULL_SYSTEM
217Addr
218System::new_page()
219{
220    Addr return_addr = page_ptr << LogVMPageSize;
221    ++page_ptr;
222    if (return_addr >= physmem->size())
223        fatal("Out of memory, please increase size of physical memory.");
224    return return_addr;
225}
226#endif
227
228void
229System::serialize(ostream &os)
230{
231#if FULL_SYSTEM
232    kernelSymtab->serialize("kernel_symtab", os);
233#endif // FULL_SYSTEM
234}
235
236
237void
238System::unserialize(Checkpoint *cp, const string &section)
239{
240#if FULL_SYSTEM
241    kernelSymtab->unserialize("kernel_symtab", cp, section);
242#endif // FULL_SYSTEM
243}
244
245void
246System::printSystems()
247{
248    vector<System *>::iterator i = systemList.begin();
249    vector<System *>::iterator end = systemList.end();
250    for (; i != end; ++i) {
251        System *sys = *i;
252        cerr << "System " << sys->name() << ": " << hex << sys << endl;
253    }
254}
255
256void
257printSystems()
258{
259    System::printSystems();
260}
261
262const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
263    "timing"};
264
265#if FULL_SYSTEM
266
267// In full system mode, only derived classes (e.g. AlphaLinuxSystem)
268// can be created directly.
269
270DEFINE_SIM_OBJECT_CLASS_NAME("System", System)
271
272#else
273
274BEGIN_DECLARE_SIM_OBJECT_PARAMS(System)
275
276    SimObjectParam<PhysicalMemory *> physmem;
277    SimpleEnumParam<System::MemoryMode> mem_mode;
278
279END_DECLARE_SIM_OBJECT_PARAMS(System)
280
281BEGIN_INIT_SIM_OBJECT_PARAMS(System)
282
283    INIT_PARAM(physmem, "physical memory"),
284    INIT_ENUM_PARAM(mem_mode, "Memory Mode, (1=atomic, 2=timing)",
285            System::MemoryModeStrings)
286
287END_INIT_SIM_OBJECT_PARAMS(System)
288
289CREATE_SIM_OBJECT(System)
290{
291    System::Params *p = new System::Params;
292    p->name = getInstanceName();
293    p->physmem = physmem;
294    p->mem_mode = mem_mode;
295    return new System(p);
296}
297
298REGISTER_SIM_OBJECT("System", System)
299
300#endif
301