src/sim/system.cc

   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
  50 using namespace std;
  51 using namespace TheISA;
  52
  53 vector<System *> System::systemList;
  54
  55 int System::numSystemsRunning = 0;
  56
  57 System::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
 133 System::~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
 147 int rgdb_wait = -1;
 148
 149 #endif // FULL_SYSTEM
 150
 151
 152 void
 153 System::setMemoryMode(MemoryMode mode)
 154 {
 155     assert(getState() == Drained);
 156     memoryMode = mode;
 157 }
 158
 159 int
 160 System::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
 199 void
 200 System::startup()
 201 {
 202     int i;
 203     for (i = 0; i < threadContexts.size(); i++)
 204         threadContexts[i]->activate(0);
 205 }
 206
 207 void
 208 System::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
 222 Addr
 223 System::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
 233 void
 234 System::serialize(ostream &os)
 235 {
 236 #if FULL_SYSTEM
 237     kernelSymtab->serialize("kernel_symtab", os);
 238 #endif // FULL_SYSTEM
 239 }
 240
 241
 242 void
 243 System::unserialize(Checkpoint *cp, const string &section)
 244 {
 245 #if FULL_SYSTEM
 246     kernelSymtab->unserialize("kernel_symtab", cp, section);
 247 #endif // FULL_SYSTEM
 248 }
 249
 250 void
 251 System::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
 261 void
 262 printSystems()
 263 {
 264     System::printSystems();
 265 }
 266
 267 const 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
 275 DEFINE_SIM_OBJECT_CLASS_NAME("System", System)
 276
 277 #else
 278
 279 BEGIN_DECLARE_SIM_OBJECT_PARAMS(System)
 280
 281     SimObjectParam<PhysicalMemory *> physmem;
 282     SimpleEnumParam<System::MemoryMode> mem_mode;
 283
 284 END_DECLARE_SIM_OBJECT_PARAMS(System)
 285
 286 BEGIN_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
 292 END_INIT_SIM_OBJECT_PARAMS(System)
 293
 294 CREATE_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
 303 REGISTER_SIM_OBJECT("System", System)
 304
 305 #endif