interrupts.hh revision 7720 
1/*
2 * Copyright (c) 2007 MIPS Technologies, Inc.
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: Rick Strong
29 */
30
31#ifndef __ARCH_MIPS_INTERRUPT_HH__
32#define __ARCH_MIPS_INTERRUPT_HH__
33
34#include <string>
35
36#include "arch/mips/faults.hh"
37#include "base/compiler.hh"
38#include "base/misc.hh"
39#include "params/MipsInterrupts.hh"
40#include "sim/serialize.hh"
41#include "sim/sim_object.hh"
42
43class BaseCPU;
44class Checkpoint;
45
46namespace MipsISA
47{
48
49class Interrupts : public SimObject
50{
51  public:
52    typedef MipsInterruptsParams Params;
53
54    const Params *
55    params() const
56    {
57        return dynamic_cast<const Params *>(_params);
58    }
59
60    Interrupts(Params * p) : SimObject(p)
61    {
62        newInfoSet = false;
63    }
64
65    void
66    setCPU(BaseCPU *_cpu)
67    {}
68
69    //  post(int int_num, int index) is responsible
70    //  for posting an interrupt. It sets a bit
71    //  in intstatus corresponding to Cause IP*. The
72    //  MIPS register Cause is updated by updateIntrInfo
73    //  which is called by checkInterrupts
74    //
75    void post(int int_num, ThreadContext *tc);
76    void post(int int_num, int index);
77
78    // clear(int int_num, int index) is responsible
79    //  for clearing an interrupt. It clear a bit
80    //  in intstatus corresponding to Cause IP*. The
81    //  MIPS register Cause is updated by updateIntrInfo
82    //  which is called by checkInterrupts
83    //
84    void clear(int int_num, ThreadContext* tc);
85    void clear(int int_num, int index);
86
87    //  clearAll() is responsible
88    //  for clearing all interrupts. It clears all bits
89    //  in intstatus corresponding to Cause IP*. The
90    //  MIPS register Cause is updated by updateIntrInfo
91    //  which is called by checkInterrupts
92    //
93    void clearAll(ThreadContext *tc);
94    void clearAll();
95
96    // getInterrupt(ThreadContext * tc) checks if an interrupt
97    //  should be returned. It ands the interrupt mask and
98    //  and interrupt pending bits to see if one exists. It
99    //  also makes sure interrupts are enabled (IE) and
100    //  that ERL and ERX are not set
101    //
102    Fault getInterrupt(ThreadContext *tc);
103
104    // updateIntrInfo(ThreadContext *tc) const syncs the
105    //  MIPS cause register with the instatus variable. instatus
106    //  is essentially a copy of the MIPS cause[IP7:IP0]
107    //
108    void updateIntrInfo(ThreadContext *tc) const;
109    bool interruptsPending(ThreadContext *tc) const;
110    bool onCpuTimerInterrupt(ThreadContext *tc) const;
111
112    bool
113    checkInterrupts(ThreadContext *tc) const
114    {
115        return interruptsPending(tc);
116    }
117
118
119    void
120    serialize(std::ostream &os)
121    {
122        fatal("Serialization of Interrupts Unimplemented for MIPS");
123    }
124
125    void
126    unserialize(Checkpoint *cp, const std::string &section)
127    {
128        fatal("Unserialization of Interrupts Unimplemented for MIPS");
129    }
130
131  private:
132    bool newInfoSet;
133    int newIpl;
134    int newSummary;
135};
136
137}
138
139#endif
140
141