base.hh revision 2665:a124942bacb8 
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 * Authors: Steve Reinhardt
29 *          Nathan Binkert
30 */
31
32#ifndef __CPU_BASE_HH__
33#define __CPU_BASE_HH__
34
35#include <vector>
36
37#include "base/statistics.hh"
38#include "config/full_system.hh"
39#include "cpu/sampler/sampler.hh"
40#include "sim/eventq.hh"
41#include "sim/sim_object.hh"
42#include "arch/isa_traits.hh"
43
44class System;
45namespace Kernel { class Statistics; }
46class BranchPred;
47class ExecContext;
48
49class 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[TheISA::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 > TheISA::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        System *system;
127#if FULL_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    virtual void activateWhenReady(int tid) {};
145
146    void registerExecContexts();
147
148    /// Prepare for another CPU to take over execution.  When it is
149    /// is ready (drained pipe) it signals the sampler.
150    virtual void switchOut(Sampler *);
151
152    /// Take over execution from the given CPU.  Used for warm-up and
153    /// sampling.
154    virtual void takeOverFrom(BaseCPU *);
155
156    /**
157     *  Number of threads we're actually simulating (<= SMT_MAX_THREADS).
158     * This is a constant for the duration of the simulation.
159     */
160    int number_of_threads;
161
162    /**
163     * Vector of per-thread instruction-based event queues.  Used for
164     * scheduling events based on number of instructions committed by
165     * a particular thread.
166     */
167    EventQueue **comInstEventQueue;
168
169    /**
170     * Vector of per-thread load-based event queues.  Used for
171     * scheduling events based on number of loads committed by
172     *a particular thread.
173     */
174    EventQueue **comLoadEventQueue;
175
176    System *system;
177
178#if FULL_SYSTEM
179    /**
180     * Serialize this object to the given output stream.
181     * @param os The stream to serialize to.
182     */
183    virtual void serialize(std::ostream &os);
184
185    /**
186     * Reconstruct the state of this object from a checkpoint.
187     * @param cp The checkpoint use.
188     * @param section The section name of this object
189     */
190    virtual void unserialize(Checkpoint *cp, const std::string &section);
191
192#endif
193
194    /**
195     * Return pointer to CPU's branch predictor (NULL if none).
196     * @return Branch predictor pointer.
197     */
198    virtual BranchPred *getBranchPred() { return NULL; };
199
200    virtual Counter totalInstructions() const { return 0; }
201
202    // Function tracing
203  private:
204    bool functionTracingEnabled;
205    std::ostream *functionTraceStream;
206    Addr currentFunctionStart;
207    Addr currentFunctionEnd;
208    Tick functionEntryTick;
209    void enableFunctionTrace();
210    void traceFunctionsInternal(Addr pc);
211
212  protected:
213    void traceFunctions(Addr pc)
214    {
215        if (functionTracingEnabled)
216            traceFunctionsInternal(pc);
217    }
218
219  private:
220    static std::vector<BaseCPU *> cpuList;   //!< Static global cpu list
221
222  public:
223    static int numSimulatedCPUs() { return cpuList.size(); }
224    static Counter numSimulatedInstructions()
225    {
226        Counter total = 0;
227
228        int size = cpuList.size();
229        for (int i = 0; i < size; ++i)
230            total += cpuList[i]->totalInstructions();
231
232        return total;
233    }
234
235  public:
236    // Number of CPU cycles simulated
237    Stats::Scalar<> numCycles;
238
239#if FULL_SYSTEM
240    Kernel::Statistics *kernelStats;
241#endif
242};
243
244#endif // __CPU_BASE_HH__
245