FreeBSD/Linux Kernel Cross Reference
sys/sys/interrupt.h
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: releng/6.4/sys/sys/interrupt.h 169202 2007-05-02 06:15:13Z njl $
27 */
28
29 #ifndef _SYS_INTERRUPT_H_
30 #define _SYS_INTERRUPT_H_
31
32 #include <sys/_lock.h>
33 #include <sys/_mutex.h>
34
35 /* Compatibility shims */
36 #define tty_intr_event tty_ithd
37 #define clk_intr_event clk_ithd
38 #define ithd intr_event
39 #define ithread_destroy intr_event_destroy
40 #define ithread_remove_handler intr_event_remove_handler
41
42 struct intr_event;
43 struct intr_thread;
44
45 /*
46 * Describe a hardware interrupt handler.
47 *
48 * Multiple interrupt handlers for a specific event can be chained
49 * together.
50 */
51 struct intr_handler {
52 driver_intr_t *ih_handler; /* Handler function. */
53 void *ih_argument; /* Argument to pass to handler. */
54 int ih_flags;
55 const char *ih_name; /* Name of handler. */
56 struct intr_event *ih_event; /* Event we are connected to. */
57 int ih_need; /* Needs service. */
58 TAILQ_ENTRY(intr_handler) ih_next; /* Next handler for this event. */
59 u_char ih_pri; /* Priority of this handler. */
60 };
61
62 /* Interrupt handle flags kept in ih_flags */
63 #define IH_FAST 0x00000001 /* Fast interrupt. */
64 #define IH_EXCLUSIVE 0x00000002 /* Exclusive interrupt. */
65 #define IH_ENTROPY 0x00000004 /* Device is a good entropy source. */
66 #define IH_DEAD 0x00000008 /* Handler should be removed. */
67 #define IH_MPSAFE 0x80000000 /* Handler does not need Giant. */
68
69 /*
70 * Describe an interrupt event. An event holds a list of handlers.
71 */
72 struct intr_event {
73 TAILQ_ENTRY(intr_event) ie_list;
74 TAILQ_HEAD(, intr_handler) ie_handlers; /* Interrupt handlers. */
75 char ie_name[MAXCOMLEN]; /* Individual event name. */
76 char ie_fullname[MAXCOMLEN];
77 struct mtx ie_lock;
78 void *ie_source; /* Cookie used by MD code. */
79 struct intr_thread *ie_thread; /* Thread we are connected to. */
80 void (*ie_enable)(void *);
81 int ie_flags;
82 int ie_count; /* Loop counter. */
83 int ie_warncnt; /* Rate-check interrupt storm warns. */
84 struct timeval ie_warntm;
85 };
86
87 /* Interrupt event flags kept in ie_flags. */
88 #define IE_SOFT 0x000001 /* Software interrupt. */
89 #define IE_ENTROPY 0x000002 /* Interrupt is an entropy source. */
90 #define IE_ADDING_THREAD 0x000004 /* Currently building an ithread. */
91
92 /* Flags to pass to sched_swi. */
93 #define SWI_DELAY 0x2
94
95 /*
96 * Software interrupt numbers in priority order. The priority determines
97 * the priority of the corresponding interrupt thread.
98 */
99 #define SWI_TTY 0
100 #define SWI_NET 1
101 #define SWI_CAMBIO 2
102 #define SWI_VM 3
103 #define SWI_CLOCK 4
104 #define SWI_TQ_FAST 5
105 #define SWI_TQ 6
106 #define SWI_TQ_GIANT 6
107
108 extern struct intr_event *tty_intr_event;
109 extern struct intr_event *clk_intr_event;
110 extern void *softclock_ih;
111 extern void *vm_ih;
112
113 /* Counts and names for statistics (defined in MD code). */
114 extern u_long eintrcnt[]; /* end of intrcnt[] */
115 extern char eintrnames[]; /* end of intrnames[] */
116 extern u_long intrcnt[]; /* counts for for each device and stray */
117 extern char intrnames[]; /* string table containing device names */
118
119 #ifdef DDB
120 void db_dump_intr_event(struct intr_event *ie, int handlers);
121 #endif
122 u_char intr_priority(enum intr_type flags);
123 int intr_event_add_handler(struct intr_event *ie, const char *name,
124 driver_intr_t handler, void *arg, u_char pri, enum intr_type flags,
125 void **cookiep);
126 int intr_event_create(struct intr_event **event, void *source,
127 int flags, void (*enable)(void *), const char *fmt, ...)
128 __printflike(5, 6);
129 int intr_event_destroy(struct intr_event *ie);
130 int intr_event_remove_handler(void *cookie);
131 int intr_event_schedule_thread(struct intr_event *ie);
132 int swi_add(struct intr_event **eventp, const char *name,
133 driver_intr_t handler, void *arg, int pri, enum intr_type flags,
134 void **cookiep);
135 void swi_sched(void *cookie, int flags);
136 int swi_remove(void *cookie);
137
138 #endif
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