interrupts.hh revision 3827 
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: Gabe Black
29 */
30
31#ifndef __ARCH_SPARC_INTERRUPT_HH__
32#define __ARCH_SPARC_INTERRUPT_HH__
33
34#include "arch/sparc/faults.hh"
35#include "cpu/thread_context.hh"
36
37
38namespace SparcISA
39{
40    class Interrupts
41    {
42      protected:
43
44
45      public:
46        Interrupts()
47        {
48
49        }
50        void post(int int_num, int index)
51        {
52
53        }
54
55        void clear(int int_num, int index)
56        {
57
58        }
59
60        void clear_all()
61        {
62
63        }
64
65        bool check_interrupts(ThreadContext * tc) const
66        {
67            // so far only handle softint interrupts
68            int int_level = InterruptLevel(tc->readMiscReg(MISCREG_SOFTINT));
69            if (int_level)
70                return true;
71            else
72                return false;
73        }
74
75        Fault getInterrupt(ThreadContext * tc)
76        {
77            // conditioning the softint interrups
78            if (tc->readMiscReg(MISCREG_HPSTATE) & hpriv) {
79                // if running in privileged mode, then pend the interrupt
80                return NoFault;
81            } else {
82                int int_level = InterruptLevel(tc->readMiscReg(MISCREG_SOFTINT));
83                if ((int_level <= tc->readMiscReg(MISCREG_PIL)) ||
84                    !(tc->readMiscReg(MISCREG_PSTATE) & ie)) {
85                    // if PIL or no interrupt enabled, then pend the interrupt
86                    return NoFault;
87                } else {
88                    return new InterruptLevelN(int_level);
89                }
90            }
91        }
92
93        void updateIntrInfo(ThreadContext * tc)
94        {
95
96        }
97
98        void serialize(std::ostream &os)
99        {
100        }
101
102        void unserialize(Checkpoint *cp, const std::string &section)
103        {
104        }
105    };
106}
107
108#endif // __ARCH_SPARC_INTERRUPT_HH__
109