cpuevent.hh revision 2651 
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 ExecContext;
38
39/** This class creates a global list of events than need a pointer to an
40 * execution context. When a switchover takes place the events can be migrated
41 * to the new execution context, otherwise you could have a wake timer interrupt
42 * go off on a switched out cpu or other unfortunate events. This object MUST be
43 * dynamically allocated to avoid it being deleted after a cpu switch happens.
44 * */
45class CpuEvent : public Event
46{
47  private:
48    /** type of global list of cpu events. */
49    typedef std::vector<CpuEvent *> CpuEventList;
50
51    /** Static list of cpu events that is searched every time a cpu switch
52     * happens. */
53    static CpuEventList cpuEventList;
54
55    /** The execution context that is switched to the new cpus. */
56    ExecContext *xc;
57
58  public:
59    CpuEvent(EventQueue *q, ExecContext *_xc, Priority p = Default_Pri)
60        : Event(q, p), xc(_xc)
61    { cpuEventList.push_back(this); }
62
63    /** delete the cpu event from the global list. */
64    ~CpuEvent();
65
66    /** Update all events switching old xc to new xc.
67     * @param oldXc the old exeuction context we are switching from
68     * @param newXc the new execution context we are switching to.
69     */
70    static void replaceExecContext(ExecContext *oldXc, ExecContext *newXc);
71};
72
73template <class T, void (T::* F)(ExecContext *xc)>
74class CpuEventWrapper : public CpuEvent
75{
76  private:
77    T *object;
78
79  public:
80    CpuEventWrapper(T *obj, ExecContext *_xc, EventQueue *q = &mainEventQueue,
81            Priority p = Default_Pri)
82        : CpuEvent(q, _xc, p), object(obj)
83    { }
84    void process() { (object->*F)(xc); }
85};
86
87#endif // __CPU_CPUEVENT_HH__
88
89