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 * $FreeBSD$
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 struct intr_event;
36 struct intr_thread;
37 struct trapframe;
38
39 /*
40 * Describe a hardware interrupt handler.
41 *
42 * Multiple interrupt handlers for a specific event can be chained
43 * together.
44 */
45 struct intr_handler {
46 driver_filter_t *ih_filter; /* Filter function. */
47 driver_intr_t *ih_handler; /* Handler function. */
48 void *ih_argument; /* Argument to pass to handler. */
49 int ih_flags;
50 const char *ih_name; /* Name of handler. */
51 struct intr_event *ih_event; /* Event we are connected to. */
52 int ih_need; /* Needs service. */
53 TAILQ_ENTRY(intr_handler) ih_next; /* Next handler for this event. */
54 u_char ih_pri; /* Priority of this handler. */
55 struct intr_thread *ih_thread; /* Ithread for filtered handler. */
56 };
57
58 /* Interrupt handle flags kept in ih_flags */
59 #define IH_EXCLUSIVE 0x00000002 /* Exclusive interrupt. */
60 #define IH_ENTROPY 0x00000004 /* Device is a good entropy source. */
61 #define IH_DEAD 0x00000008 /* Handler should be removed. */
62 #define IH_MPSAFE 0x80000000 /* Handler does not need Giant. */
63
64 /*
65 * Describe an interrupt event. An event holds a list of handlers.
66 */
67 struct intr_event {
68 TAILQ_ENTRY(intr_event) ie_list;
69 TAILQ_HEAD(, intr_handler) ie_handlers; /* Interrupt handlers. */
70 char ie_name[MAXCOMLEN]; /* Individual event name. */
71 char ie_fullname[MAXCOMLEN];
72 struct mtx ie_lock;
73 void *ie_source; /* Cookie used by MD code. */
74 struct intr_thread *ie_thread; /* Thread we are connected to. */
75 void (*ie_enable)(void *);
76 #ifdef INTR_FILTER
77 void (*ie_eoi)(void *);
78 void (*ie_disab)(void *);
79 #endif
80 int ie_flags;
81 int ie_count; /* Loop counter. */
82 int ie_warncnt; /* Rate-check interrupt storm warns. */
83 struct timeval ie_warntm;
84 };
85
86 /* Interrupt event flags kept in ie_flags. */
87 #define IE_SOFT 0x000001 /* Software interrupt. */
88 #define IE_ENTROPY 0x000002 /* Interrupt is an entropy source. */
89 #define IE_ADDING_THREAD 0x000004 /* Currently building an ithread. */
90
91 /* Flags to pass to sched_swi. */
92 #define SWI_DELAY 0x2
93
94 /*
95 * Software interrupt numbers in priority order. The priority determines
96 * the priority of the corresponding interrupt thread.
97 */
98 #define SWI_TTY 0
99 #define SWI_NET 1
100 #define SWI_CAMBIO 2
101 #define SWI_VM 3
102 #define SWI_CLOCK 4
103 #define SWI_TQ_FAST 5
104 #define SWI_TQ 6
105 #define SWI_TQ_GIANT 6
106
107 extern struct intr_event *tty_intr_event;
108 extern struct intr_event *clk_intr_event;
109 extern void *softclock_ih;
110 extern void *vm_ih;
111
112 /* Counts and names for statistics (defined in MD code). */
113 extern u_long eintrcnt[]; /* end of intrcnt[] */
114 extern char eintrnames[]; /* end of intrnames[] */
115 extern u_long intrcnt[]; /* counts for for each device and stray */
116 extern char intrnames[]; /* string table containing device names */
117
118 #ifdef DDB
119 void db_dump_intr_event(struct intr_event *ie, int handlers);
120 #endif
121 #ifdef INTR_FILTER
122 int intr_filter_loop(struct intr_event *ie, struct trapframe *frame,
123 struct intr_thread **ithd);
124 int intr_event_handle(struct intr_event *ie, struct trapframe *frame);
125 #endif
126 u_char intr_priority(enum intr_type flags);
127 int intr_event_add_handler(struct intr_event *ie, const char *name,
128 driver_filter_t filter, driver_intr_t handler, void *arg,
129 u_char pri, enum intr_type flags, void **cookiep);
130 #ifndef INTR_FILTER
131 int intr_event_create(struct intr_event **event, void *source,
132 int flags, void (*enable)(void *), const char *fmt, ...)
133 __printflike(5, 6);
134 #else
135 int intr_event_create(struct intr_event **event, void *source,
136 int flags, void (*enable)(void *), void (*eoi)(void *),
137 void (*disab)(void *), const char *fmt, ...)
138 __printflike(7, 8);
139 #endif
140 int intr_event_destroy(struct intr_event *ie);
141 int intr_event_remove_handler(void *cookie);
142 #ifndef INTR_FILTER
143 int intr_event_schedule_thread(struct intr_event *ie);
144 #else
145 int intr_event_schedule_thread(struct intr_event *ie,
146 struct intr_thread *ithd);
147 #endif
148 void *intr_handler_source(void *cookie);
149 int swi_add(struct intr_event **eventp, const char *name,
150 driver_intr_t handler, void *arg, int pri, enum intr_type flags,
151 void **cookiep);
152 void swi_sched(void *cookie, int flags);
153 int swi_remove(void *cookie);
154
155 #endif
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