format cleanup for readability. Tab out back-slashes.
[dragonfly.git] / sys / kern / kern_intr.c
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1/*
2 * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
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
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/kern/kern_intr.c,v 1.24.2.1 2001/10/14 20:05:50 luigi Exp $
1de703da 27 * $DragonFly: src/sys/kern/kern_intr.c,v 1.2 2003/06/17 04:28:41 dillon Exp $
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28 *
29 */
30
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/malloc.h>
35#include <sys/kernel.h>
36#include <sys/sysctl.h>
37
38#include <machine/ipl.h>
39
40#include <sys/interrupt.h>
41
42struct swilist {
43 swihand_t *sl_handler;
44 struct swilist *sl_next;
45};
46
47static struct swilist swilists[NSWI];
48
49void
50register_swi(intr, handler)
51 int intr;
52 swihand_t *handler;
53{
54 struct swilist *slp, *slq;
55 int s;
56
57 if (intr < NHWI || intr >= NHWI + NSWI)
58 panic("register_swi: bad intr %d", intr);
59 if (handler == swi_generic || handler == swi_null)
60 panic("register_swi: bad handler %p", (void *)handler);
61 slp = &swilists[intr - NHWI];
62 s = splhigh();
63 if (ihandlers[intr] == swi_null)
64 ihandlers[intr] = handler;
65 else {
66 if (slp->sl_next == NULL) {
67 slp->sl_handler = ihandlers[intr];
68 ihandlers[intr] = swi_generic;
69 }
70 slq = malloc(sizeof(*slq), M_DEVBUF, M_NOWAIT);
71 if (slq == NULL)
72 panic("register_swi: malloc failed");
73 slq->sl_handler = handler;
74 slq->sl_next = NULL;
75 while (slp->sl_next != NULL)
76 slp = slp->sl_next;
77 slp->sl_next = slq;
78 }
79 splx(s);
80}
81
82void
83swi_dispatcher(intr)
84 int intr;
85{
86 struct swilist *slp;
87
88 slp = &swilists[intr - NHWI];
89 do {
90 (*slp->sl_handler)();
91 slp = slp->sl_next;
92 } while (slp != NULL);
93}
94
95void
96unregister_swi(intr, handler)
97 int intr;
98 swihand_t *handler;
99{
100 struct swilist *slfoundpred, *slp, *slq;
101 int s;
102
103 if (intr < NHWI || intr >= NHWI + NSWI)
104 panic("unregister_swi: bad intr %d", intr);
105 if (handler == swi_generic || handler == swi_null)
106 panic("unregister_swi: bad handler %p", (void *)handler);
107 slp = &swilists[intr - NHWI];
108 s = splhigh();
109 if (ihandlers[intr] == handler)
110 ihandlers[intr] = swi_null;
111 else if (slp->sl_next != NULL) {
112 slfoundpred = NULL;
113 for (slq = slp->sl_next; slq != NULL;
114 slp = slq, slq = slp->sl_next)
115 if (slq->sl_handler == handler)
116 slfoundpred = slp;
117 slp = &swilists[intr - NHWI];
118 if (slfoundpred != NULL) {
119 slq = slfoundpred->sl_next;
120 slfoundpred->sl_next = slq->sl_next;
121 free(slq, M_DEVBUF);
122 } else if (slp->sl_handler == handler) {
123 slq = slp->sl_next;
124 slp->sl_next = slq->sl_next;
125 slp->sl_handler = slq->sl_handler;
126 free(slq, M_DEVBUF);
127 }
128 if (slp->sl_next == NULL)
129 ihandlers[intr] = slp->sl_handler;
130 }
131 splx(s);
132}
133
134/*
135 * Sysctls used by systat and others: hw.intrnames and hw.intrcnt.
136 * The data for this machine dependent, and the declarations are in machine
137 * dependent code. The layout of intrnames and intrcnt however is machine
138 * independent.
139 *
140 * We do not know the length of intrcnt and intrnames at compile time, so
141 * calculate things at run time.
142 */
143static int
144sysctl_intrnames(SYSCTL_HANDLER_ARGS)
145{
146 return (sysctl_handle_opaque(oidp, intrnames, eintrnames - intrnames,
147 req));
148}
149
150SYSCTL_PROC(_hw, OID_AUTO, intrnames, CTLTYPE_OPAQUE | CTLFLAG_RD,
151 NULL, 0, sysctl_intrnames, "", "Interrupt Names");
152
153static int
154sysctl_intrcnt(SYSCTL_HANDLER_ARGS)
155{
156 return (sysctl_handle_opaque(oidp, intrcnt,
157 (char *)eintrcnt - (char *)intrcnt, req));
158}
159
160SYSCTL_PROC(_hw, OID_AUTO, intrcnt, CTLTYPE_OPAQUE | CTLFLAG_RD,
161 NULL, 0, sysctl_intrcnt, "", "Interrupt Counts");