trace_cpu.hh revision 2665:a124942bacb8 
1/*
2 * Copyright (c) 2004-2005 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: Erik Hallnor
29 */
30
31/**
32 * @file
33 * Declaration of a memory trace CPU object. Uses a memory trace to drive the
34 * provided memory hierarchy.
35 */
36
37#ifndef __CPU_TRACE_TRACE_CPU_HH__
38#define __CPU_TRACE_TRACE_CPU_HH__
39
40#include <string>
41
42#include "mem/mem_req.hh" // for MemReqPtr
43#include "sim/eventq.hh" // for Event
44#include "sim/sim_object.hh"
45
46// Forward declaration.
47class MemInterface;
48class MemTraceReader;
49
50/**
51 * A cpu object for running memory traces through a memory hierarchy.
52 */
53class TraceCPU : public SimObject
54{
55  private:
56    /** Interface for instruction trace requests, if any. */
57    MemInterface *icacheInterface;
58    /** Interface for data trace requests, if any. */
59    MemInterface *dcacheInterface;
60
61    /** Data reference trace. */
62    MemTraceReader *dataTrace;
63
64    /** Number of outstanding requests. */
65    int outstandingRequests;
66
67    /** Cycle of the next request, 0 if not available. */
68    Tick nextCycle;
69
70    /** Next request. */
71    MemReqPtr nextReq;
72
73    /**
74     * Event to call the TraceCPU::tick
75     */
76    class TickEvent : public Event
77    {
78      private:
79        /** The associated CPU */
80        TraceCPU *cpu;
81
82      public:
83        /**
84         * Construct this event;
85         */
86        TickEvent(TraceCPU *c);
87
88        /**
89         * Call the tick function.
90         */
91        void process();
92
93        /**
94         * Return a string description of this event.
95         */
96        const char *description();
97    };
98
99    TickEvent tickEvent;
100
101  public:
102    /**
103     * Construct a TraceCPU object.
104     */
105    TraceCPU(const std::string &name,
106             MemInterface *icache_interface,
107             MemInterface *dcache_interface,
108             MemTraceReader *data_trace);
109
110    inline Tick cycles(int numCycles) { return numCycles; }
111
112    /**
113     * Perform all the accesses for one cycle.
114     */
115    void tick();
116
117    /**
118     * Handle a completed memory request.
119     */
120    void completeRequest(MemReqPtr &req);
121};
122
123class TraceCompleteEvent : public Event
124{
125    MemReqPtr req;
126    TraceCPU *tester;
127
128  public:
129
130    TraceCompleteEvent(MemReqPtr &_req, TraceCPU *_tester)
131        : Event(&mainEventQueue), req(_req), tester(_tester)
132    {
133        setFlags(AutoDelete);
134    }
135
136    void process();
137
138    virtual const char *description();
139};
140
141#endif // __CPU_TRACE_TRACE_CPU_HH__
142
143