cpuevent.hh revision 5606:6da7a58b0bc8 
1/*
2 * Copyright (c) 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: Ali Saidi
29 */
30
31#ifndef __CPU_CPUEVENT_HH__
32#define __CPU_CPUEVENT_HH__
33
34#include <vector>
35#include "sim/eventq.hh"
36
37class ThreadContext;
38
39/**
40 * This class creates a global list of events that need a pointer to a
41 * thread context. When a switchover takes place the events can be
42 * migrated to the new thread context, otherwise you could have a wake
43 * timer interrupt go off on a switched out cpu or other unfortunate
44 * events. This object MUST be dynamically allocated to avoid it being
45 * deleted after a cpu switch happens.
46 */
47class CpuEvent : public Event
48{
49  protected:
50    /** type of global list of cpu events. */
51    typedef std::vector<CpuEvent *> CpuEventList;
52
53    /** Static list of cpu events that is searched every time a cpu switch
54     * happens. */
55    static CpuEventList cpuEventList;
56
57    /** The thread context that is switched to the new cpus. */
58    ThreadContext *tc;
59
60  public:
61    CpuEvent(ThreadContext *_tc, Priority p = Default_Pri)
62        : Event(p), tc(_tc)
63    { cpuEventList.push_back(this); }
64
65    /** delete the cpu event from the global list. */
66    ~CpuEvent();
67
68    /** Update all events switching old tc to new tc.
69     * @param oldTc the old thread context we are switching from
70     * @param newTc the new thread context we are switching to.
71     */
72    static void replaceThreadContext(ThreadContext *oldTc,
73                                     ThreadContext *newTc);
74    ThreadContext* getTC() { return tc; }
75};
76
77template <class T, void (T::* F)(ThreadContext *tc)>
78class CpuEventWrapper : public CpuEvent
79{
80  private:
81    T *object;
82
83  public:
84    CpuEventWrapper(T *obj, ThreadContext *_tc, Priority p = Default_Pri)
85        : CpuEvent(_tc, p), object(obj)
86    { }
87    void process() { (object->*F)(tc); }
88};
89
90#endif // __CPU_CPUEVENT_HH__
91
92