interrupts.hh revision 3520:4f4a2054fd85 
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: Steve Reinhardt
29 *          Kevin Lim
30 */
31
32#ifndef __ARCH_ALPHA_INTERRUPT_HH__
33#define __ARCH_ALPHA_INTERRUPT_HH__
34
35#include "arch/alpha/faults.hh"
36#include "arch/alpha/isa_traits.hh"
37#include "cpu/thread_context.hh"
38
39namespace AlphaISA
40{
41    class Interrupts
42    {
43      protected:
44        uint64_t interrupts[NumInterruptLevels];
45        uint64_t intstatus;
46
47      public:
48        Interrupts()
49        {
50            memset(interrupts, 0, sizeof(interrupts));
51            intstatus = 0;
52        }
53
54        void post(int int_num, int index)
55        {
56            DPRINTF(Interrupt, "Interrupt %d:%d posted\n", int_num, index);
57
58            if (int_num < 0 || int_num >= NumInterruptLevels)
59                panic("int_num out of bounds\n");
60
61            if (index < 0 || index >= sizeof(uint64_t) * 8)
62                panic("int_num out of bounds\n");
63
64            interrupts[int_num] |= 1 << index;
65            intstatus |= (ULL(1) << int_num);
66        }
67
68        void clear(int int_num, int index)
69        {
70            DPRINTF(Interrupt, "Interrupt %d:%d cleared\n", int_num, index);
71
72            if (int_num < 0 || int_num >= TheISA::NumInterruptLevels)
73                panic("int_num out of bounds\n");
74
75            if (index < 0 || index >= sizeof(uint64_t) * 8)
76                panic("int_num out of bounds\n");
77
78            interrupts[int_num] &= ~(1 << index);
79            if (interrupts[int_num] == 0)
80                intstatus &= ~(ULL(1) << int_num);
81        }
82
83        void clear_all()
84        {
85            DPRINTF(Interrupt, "Interrupts all cleared\n");
86
87            memset(interrupts, 0, sizeof(interrupts));
88            intstatus = 0;
89        }
90
91        bool check_interrupt(int int_num) const {
92            if (int_num > NumInterruptLevels)
93                panic("int_num out of bounds\n");
94
95            return interrupts[int_num] != 0;
96        }
97
98        bool check_interrupts() const { return intstatus != 0; }
99
100        void serialize(std::ostream &os)
101        {
102            SERIALIZE_ARRAY(interrupts, NumInterruptLevels);
103            SERIALIZE_SCALAR(intstatus);
104        }
105
106        void unserialize(Checkpoint *cp, const std::string &section)
107        {
108            UNSERIALIZE_ARRAY(interrupts, NumInterruptLevels);
109            UNSERIALIZE_SCALAR(intstatus);
110        }
111
112        Fault getInterrupt(ThreadContext * tc)
113        {
114            int ipl = 0;
115            int summary = 0;
116
117            if (tc->readMiscReg(IPR_ASTRR))
118                panic("asynchronous traps not implemented\n");
119
120            if (tc->readMiscReg(IPR_SIRR)) {
121                for (int i = INTLEVEL_SOFTWARE_MIN;
122                     i < INTLEVEL_SOFTWARE_MAX; i++) {
123                    if (tc->readMiscReg(IPR_SIRR) & (ULL(1) << i)) {
124                        // See table 4-19 of 21164 hardware reference
125                        ipl = (i - INTLEVEL_SOFTWARE_MIN) + 1;
126                        summary |= (ULL(1) << i);
127                    }
128                }
129            }
130
131            uint64_t interrupts = intstatus;
132            if (interrupts) {
133                for (int i = INTLEVEL_EXTERNAL_MIN;
134                    i < INTLEVEL_EXTERNAL_MAX; i++) {
135                    if (interrupts & (ULL(1) << i)) {
136                        // See table 4-19 of 21164 hardware reference
137                        ipl = i;
138                        summary |= (ULL(1) << i);
139                    }
140                }
141            }
142
143            if (ipl && ipl > tc->readMiscReg(IPR_IPLR)) {
144                tc->setMiscReg(IPR_ISR, summary);
145                tc->setMiscReg(IPR_INTID, ipl);
146
147        /* The following needs to be added back in somehow */
148        // Checker needs to know these two registers were updated.
149/*#if USE_CHECKER
150        if (this->checker) {
151            this->checker->threadBase()->setMiscReg(IPR_ISR, summary);
152            this->checker->threadBase()->setMiscReg(IPR_INTID, ipl);
153        }
154#endif*/
155
156                DPRINTF(Flow, "Interrupt! IPLR=%d ipl=%d summary=%x\n",
157                        tc->readMiscReg(IPR_IPLR), ipl, summary);
158
159                return new InterruptFault;
160            } else {
161                return NoFault;
162            }
163        }
164
165      private:
166        uint64_t intr_status() const { return intstatus; }
167    };
168}
169
170#endif
171
172