interrupts.hh revision 4172:141705d83494 
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 *          Lisa Hsu
30 */
31
32#ifndef __ARCH_SPARC_INTERRUPT_HH__
33#define __ARCH_SPARC_INTERRUPT_HH__
34
35#include "arch/sparc/faults.hh"
36#include "arch/sparc/isa_traits.hh"
37#include "cpu/thread_context.hh"
38
39namespace SparcISA
40{
41
42class Interrupts
43{
44
45  private:
46
47    uint64_t interrupts[NumInterruptTypes];
48    uint64_t intStatus;
49
50  public:
51    Interrupts()
52    {
53        clear_all();
54    }
55
56    int InterruptLevel(uint64_t softint)
57    {
58        if (softint & 0x10000 || softint & 0x1)
59            return 14;
60
61        int level = 15;
62        while (level > 0 && !(1 << level & softint))
63            level--;
64        if (1 << level & softint)
65            return level;
66        return 0;
67    }
68
69    void post(int int_num, int index)
70    {
71        DPRINTF(Interrupt, "Interrupt %d:%d posted\n", int_num, index);
72        assert(int_num >= 0 && int_num < NumInterruptTypes);
73        assert(index >= 0 && index < 64);
74
75        interrupts[int_num] |= ULL(1) << index;
76        intStatus |= ULL(1) << int_num;
77    }
78
79    void clear(int int_num, int index)
80    {
81        DPRINTF(Interrupt, "Interrupt %d:%d cleared\n", int_num, index);
82        assert(int_num >= 0 && int_num < NumInterruptTypes);
83        assert(index >= 0 && index < 64);
84
85        interrupts[int_num] &= ~(ULL(1) << index);
86        if (!interrupts[int_num])
87            intStatus &= ~(ULL(1) << int_num);
88    }
89
90    void clear_all()
91    {
92        for (int i = 0; i < NumInterruptTypes; ++i) {
93            interrupts[i] = 0;
94        }
95        intStatus = 0;
96    }
97
98    bool check_interrupts(ThreadContext * tc) const
99    {
100        return intStatus;
101    }
102
103    Fault getInterrupt(ThreadContext * tc)
104    {
105        int hpstate = tc->readMiscRegNoEffect(MISCREG_HPSTATE);
106        int pstate = tc->readMiscRegNoEffect(MISCREG_PSTATE);
107        bool ie = pstate & PSTATE::ie;
108
109        // THESE ARE IN ORDER OF PRIORITY
110        // since there are early returns, and the highest
111        // priority interrupts should get serviced,
112        // it is v. important that new interrupts are inserted
113        // in the right order of processing
114        if (hpstate & HPSTATE::hpriv) {
115            if (ie) {
116                if (interrupts[IT_HINTP]) {
117                    // This will be cleaned by a HINTP write
118                    return new HstickMatch;
119                }
120                if (interrupts[IT_INT_VEC]) {
121                    // this will be cleared by an ASI read (or write)
122                    return new InterruptVector;
123                }
124            }
125        } else {
126            if (interrupts[IT_TRAP_LEVEL_ZERO]) {
127                    // this is cleared by deasserting HPSTATE::tlz
128                    return new TrapLevelZero;
129            }
130            // HStick matches always happen in priv mode (ie doesn't matter)
131            if (interrupts[IT_HINTP]) {
132                return new HstickMatch;
133            }
134            if (interrupts[IT_INT_VEC]) {
135                // this will be cleared by an ASI read (or write)
136                return new InterruptVector;
137            }
138            if (ie) {
139                if (interrupts[IT_CPU_MONDO]) {
140                    return new CpuMondo;
141                }
142                if (interrupts[IT_DEV_MONDO]) {
143                    return new DevMondo;
144                }
145                if (interrupts[IT_SOFT_INT]) {
146                    return new
147                        InterruptLevelN(InterruptLevel(interrupts[IT_SOFT_INT]));
148                }
149
150                if (interrupts[IT_RES_ERROR]) {
151                    return new ResumableError;
152                }
153            } // !hpriv && ie
154        }  // !hpriv
155        return NoFault;
156    }
157
158    void updateIntrInfo(ThreadContext * tc)
159    {
160
161    }
162
163    uint64_t get_vec(int int_num)
164    {
165        assert(int_num >= 0 && int_num < NumInterruptTypes);
166        return interrupts[int_num];
167    }
168
169    void serialize(std::ostream &os)
170    {
171        SERIALIZE_ARRAY(interrupts,NumInterruptTypes);
172        SERIALIZE_SCALAR(intStatus);
173    }
174
175    void unserialize(Checkpoint *cp, const std::string &section)
176    {
177        UNSERIALIZE_ARRAY(interrupts,NumInterruptTypes);
178        UNSERIALIZE_SCALAR(intStatus);
179    }
180};
181} // namespace SPARC_ISA
182
183#endif // __ARCH_SPARC_INTERRUPT_HH__
184