1 /* $NetBSD: interrupt.c,v 1.10 2023/08/30 17:10:17 tsutsui Exp $ */
2 /* $OpenBSD: trap.c,v 1.22 1999/05/24 23:08:59 jason Exp $ */
3
4 /*
5 * Copyright (c) 1988 University of Utah.
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * the Systems Programming Group of the University of Utah Computer
11 * Science Department and Ralph Campbell.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * from: Utah Hdr: trap.c 1.32 91/04/06
38 *
39 * @(#)trap.c 8.5 (Berkeley) 1/11/94
40 */
41
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: interrupt.c,v 1.10 2023/08/30 17:10:17 tsutsui Exp $");
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/intr.h>
49 #include <sys/cpu.h>
50
51 #include <mips/locore.h>
52
53 #include <machine/autoconf.h>
54 #include <machine/pio.h>
55
56 #include <arc/arc/timervar.h>
57 #include <arc/jazz/pica.h>
58 #include <arc/jazz/rd94.h>
59
60 struct cpu_inttab {
61 uint32_t int_mask;
62 uint32_t (*int_hand)(uint32_t, struct clockframe *);
63 };
64 static struct cpu_inttab cpu_int_tab[ARC_NINTPRI];
65
66 uint32_t cpu_int_mask; /* External cpu interrupt mask */
67
68 /*
69 * Set up handler for external interrupt events.
70 * Events are checked in priority order.
71 */
72 void
arc_set_intr(uint32_t mask,uint32_t (* int_hand)(uint32_t,struct clockframe *),int prio)73 arc_set_intr(uint32_t mask, uint32_t (*int_hand)(uint32_t, struct clockframe *),
74 int prio)
75 {
76
77 if (prio >= ARC_NINTPRI)
78 panic("arc_set_intr: too high priority");
79
80 if (cpu_int_tab[prio].int_mask != 0 &&
81 (cpu_int_tab[prio].int_mask != mask ||
82 cpu_int_tab[prio].int_hand != int_hand)) {
83 panic("set_intr: int already set");
84 }
85
86 cpu_int_tab[prio].int_hand = int_hand;
87 cpu_int_tab[prio].int_mask = mask;
88 cpu_int_mask |= mask >> 10;
89 }
90
91 /*
92 * Handle an interrupt.
93 */
94 void
cpu_intr(int ppl,vaddr_t pc,uint32_t status)95 cpu_intr(int ppl, vaddr_t pc, uint32_t status)
96 {
97 struct cpu_inttab *inttab;
98 struct clockframe cf;
99 uint32_t ipending;
100 u_int i;
101 int ipl;
102
103 curcpu()->ci_data.cpu_nintr++;
104
105 cf.pc = pc;
106 cf.sr = status;
107 cf.intr = (curcpu()->ci_idepth > 1);
108
109 while (ppl < (ipl = splintr(&ipending))) {
110 /* check MIPS3 internal clock interrupt */
111 if (ipending & MIPS_INT_MASK_5) {
112 /*
113 * Writing a value to the Compare register, as a side
114 * effect, clears the timer interrupt request.
115 */
116 mips3_cp0_compare_write(0);
117 }
118
119 /*
120 * If there is an independent timer interrupt handler,
121 * call it first.
122 */
123 inttab = &cpu_int_tab[ARC_INTPRI_TIMER_INT];
124 if (inttab->int_mask & ipending) {
125 (*inttab->int_hand)(ipending, &cf);
126 }
127
128 /*
129 * Check off all other enabled interrupts.
130 * Called handlers return mask of interrupts to be reenabled.
131 */
132 for (inttab++, i = ARC_INTPRI_TIMER_INT + 1;
133 i < ARC_NINTPRI;
134 inttab++, i++) {
135 if (inttab->int_mask & ipending) {
136 (*inttab->int_hand)(ipending, &cf);
137 }
138 }
139 (void)splhigh();
140 }
141 }
142