cpu/base.hh

   1 /*
   2  * Copyright (c) 2002-2005 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
  29 #ifndef __CPU_BASE_HH__
  30 #define __CPU_BASE_HH__
  31
  32 #include <vector>
  33
  34 #include "base/statistics.hh"
  35 #include "config/full_system.hh"
  36 #include "cpu/profile.hh"
  37 #include "cpu/sampler/sampler.hh"
  38 #include "sim/eventq.hh"
  39 #include "sim/sim_object.hh"
  40 #include "targetarch/isa_traits.hh"
  41
  42 #if FULL_SYSTEM
  43 class System;
  44 #endif
  45
  46 class BranchPred;
  47 class ExecContext;
  48
  49 class BaseCPU : public SimObject
  50 {
  51   protected:
  52     // CPU's clock period in terms of the number of ticks of curTime.
  53     Tick clock;
  54
  55   public:
  56     inline Tick frequency() const { return Clock::Frequency / clock; }
  57     inline Tick cycles(int numCycles) const { return clock * numCycles; }
  58     inline Tick curCycle() const { return curTick / clock; }
  59
  60 #if FULL_SYSTEM
  61   protected:
  62     uint64_t interrupts[NumInterruptLevels];
  63     uint64_t intstatus;
  64
  65   public:
  66     virtual void post_interrupt(int int_num, int index);
  67     virtual void clear_interrupt(int int_num, int index);
  68     virtual void clear_interrupts();
  69     bool checkInterrupts;
  70
  71     bool check_interrupt(int int_num) const {
  72         if (int_num > NumInterruptLevels)
  73             panic("int_num out of bounds\n");
  74
  75         return interrupts[int_num] != 0;
  76     }
  77
  78     bool check_interrupts() const { return intstatus != 0; }
  79     uint64_t intr_status() const { return intstatus; }
  80
  81     class ProfileEvent : public Event
  82     {
  83       private:
  84         BaseCPU *cpu;
  85         int interval;
  86
  87       public:
  88         ProfileEvent(BaseCPU *cpu, int interval);
  89         void process();
  90     };
  91     ProfileEvent *profileEvent;
  92 #endif
  93
  94   protected:
  95     std::vector<ExecContext *> execContexts;
  96
  97   public:
  98
  99     /// Notify the CPU that the indicated context is now active.  The
 100     /// delay parameter indicates the number of ticks to wait before
 101     /// executing (typically 0 or 1).
 102     virtual void activateContext(int thread_num, int delay) {}
 103
 104     /// Notify the CPU that the indicated context is now suspended.
 105     virtual void suspendContext(int thread_num) {}
 106
 107     /// Notify the CPU that the indicated context is now deallocated.
 108     virtual void deallocateContext(int thread_num) {}
 109
 110     /// Notify the CPU that the indicated context is now halted.
 111     virtual void haltContext(int thread_num) {}
 112
 113   public:
 114     struct Params
 115     {
 116         std::string name;
 117         int numberOfThreads;
 118         bool deferRegistration;
 119         Counter max_insts_any_thread;
 120         Counter max_insts_all_threads;
 121         Counter max_loads_any_thread;
 122         Counter max_loads_all_threads;
 123         Tick clock;
 124         bool functionTrace;
 125         Tick functionTraceStart;
 126 #if FULL_SYSTEM
 127         System *system;
 128         int cpu_id;
 129         Tick profile;
 130 #endif
 131
 132         Params();
 133     };
 134
 135     const Params *params;
 136
 137     BaseCPU(Params *params);
 138     virtual ~BaseCPU();
 139
 140     virtual void init();
 141     virtual void startup();
 142     virtual void regStats();
 143
 144     void registerExecContexts();
 145
 146     /// Prepare for another CPU to take over execution.  When it is
 147     /// is ready (drained pipe) it signals the sampler.
 148     virtual void switchOut(Sampler *);
 149
 150     /// Take over execution from the given CPU.  Used for warm-up and
 151     /// sampling.
 152     virtual void takeOverFrom(BaseCPU *);
 153
 154     /**
 155      *  Number of threads we're actually simulating (<= SMT_MAX_THREADS).
 156      * This is a constant for the duration of the simulation.
 157      */
 158     int number_of_threads;
 159
 160     /**
 161      * Vector of per-thread instruction-based event queues.  Used for
 162      * scheduling events based on number of instructions committed by
 163      * a particular thread.
 164      */
 165     EventQueue **comInstEventQueue;
 166
 167     /**
 168      * Vector of per-thread load-based event queues.  Used for
 169      * scheduling events based on number of loads committed by
 170      *a particular thread.
 171      */
 172     EventQueue **comLoadEventQueue;
 173
 174 #if FULL_SYSTEM
 175     System *system;
 176
 177     /**
 178      * Serialize this object to the given output stream.
 179      * @param os The stream to serialize to.
 180      */
 181     virtual void serialize(std::ostream &os);
 182
 183     /**
 184      * Reconstruct the state of this object from a checkpoint.
 185      * @param cp The checkpoint use.
 186      * @param section The section name of this object
 187      */
 188     virtual void unserialize(Checkpoint *cp, const std::string &section);
 189
 190 #endif
 191
 192     /**
 193      * Return pointer to CPU's branch predictor (NULL if none).
 194      * @return Branch predictor pointer.
 195      */
 196     virtual BranchPred *getBranchPred() { return NULL; };
 197
 198     virtual Counter totalInstructions() const { return 0; }
 199
 200     // Function tracing
 201   private:
 202     bool functionTracingEnabled;
 203     std::ostream *functionTraceStream;
 204     Addr currentFunctionStart;
 205     Addr currentFunctionEnd;
 206     Tick functionEntryTick;
 207     void enableFunctionTrace();
 208     void traceFunctionsInternal(Addr pc);
 209
 210   protected:
 211     void traceFunctions(Addr pc)
 212     {
 213         if (functionTracingEnabled)
 214             traceFunctionsInternal(pc);
 215     }
 216
 217   private:
 218     static std::vector<BaseCPU *> cpuList;   //!< Static global cpu list
 219
 220   public:
 221     static int numSimulatedCPUs() { return cpuList.size(); }
 222     static Counter numSimulatedInstructions()
 223     {
 224         Counter total = 0;
 225
 226         int size = cpuList.size();
 227         for (int i = 0; i < size; ++i)
 228             total += cpuList[i]->totalInstructions();
 229
 230         return total;
 231     }
 232
 233   public:
 234     // Number of CPU cycles simulated
 235     Stats::Scalar<> numCycles;
 236 };
 237
 238 #endif // __CPU_BASE_HH__