2 * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
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.
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.
29 #ifndef _SYS_INTERRUPT_H_
30 #define _SYS_INTERRUPT_H_
32 #include <sys/_lock.h>
33 #include <sys/_mutex.h>
36 * Describe a hardware interrupt handler.
38 * Multiple interrupt handlers for a specific vector can be chained
42 driver_intr_t *ih_handler; /* Handler function. */
43 void *ih_argument; /* Argument to pass to handler. */
45 const char *ih_name; /* Name of handler. */
46 struct ithd *ih_ithread; /* Ithread we are connected to. */
47 int ih_need; /* Needs service. */
48 TAILQ_ENTRY(intrhand) ih_next; /* Next handler for this vector. */
49 u_char ih_pri; /* Priority of this handler. */
52 /* Interrupt handle flags kept in ih_flags */
53 #define IH_FAST 0x00000001 /* Fast interrupt. */
54 #define IH_EXCLUSIVE 0x00000002 /* Exclusive interrupt. */
55 #define IH_ENTROPY 0x00000004 /* Device is a good entropy source. */
56 #define IH_DEAD 0x00000008 /* Handler should be removed. */
57 #define IH_MPSAFE 0x80000000 /* Handler does not need Giant. */
60 * Describe an interrupt thread. There is one of these per interrupt vector.
61 * Note that this actually describes an interrupt source. There may or may
62 * not be an actual kernel thread attached to a given source.
66 struct thread *it_td; /* Interrupt process. */
67 LIST_ENTRY(ithd) it_list; /* All interrupt threads. */
68 TAILQ_HEAD(, intrhand) it_handlers; /* Interrupt handlers. */
69 struct ithd *it_interrupted; /* Who we interrupted. */
70 void (*it_disable)(int); /* Enable interrupt source. */
71 void (*it_enable)(int); /* Disable interrupt source. */
72 void *it_md; /* Hook for MD interrupt code. */
73 int it_flags; /* Interrupt-specific flags. */
74 int it_need; /* Needs service. */
76 char it_name[MAXCOMLEN + 1];
79 /* Interrupt thread flags kept in it_flags */
80 #define IT_SOFT 0x000001 /* Software interrupt. */
81 #define IT_ENTROPY 0x000002 /* Interrupt is an entropy source. */
82 #define IT_DEAD 0x000004 /* Thread is waiting to exit. */
84 /* Flags to pass to sched_swi. */
88 * Software interrupt bit numbers in priority order. The priority only
89 * determines which swi will be dispatched next; a higher priority swi
90 * may be dispatched when a nested h/w interrupt handler returns.
100 extern struct ithd *tty_ithd;
101 extern struct ithd *clk_ithd;
103 extern void *softclock_ih;
106 /* Counts and names for statistics (defined in MD code). */
107 extern u_long eintrcnt[]; /* end of intrcnt[] */
108 extern char eintrnames[]; /* end of intrnames[] */
109 extern u_long intrcnt[]; /* counts for for each device and stray */
110 extern char intrnames[]; /* string table containing device names */
112 int ithread_create(struct ithd **ithread, int vector, int flags,
113 void (*disable)(int), void (*enable)(int), const char *fmt, ...)
115 int ithread_destroy(struct ithd *ithread);
116 u_char ithread_priority(enum intr_type flags);
117 int ithread_add_handler(struct ithd *ithread, const char *name,
118 driver_intr_t handler, void *arg, u_char pri, enum intr_type flags,
120 int ithread_remove_handler(void *cookie);
121 int ithread_schedule(struct ithd *ithread, int do_switch);
122 int swi_add(struct ithd **ithdp, const char *name,
123 driver_intr_t handler, void *arg, int pri, enum intr_type flags,
125 void swi_sched(void *cookie, int flags);