1 /* $OpenBSD: wseventvar.h,v 1.4 2003/06/02 23:28:04 millert Exp $ */
2 /* $NetBSD: wseventvar.h,v 1.1 1998/03/22 14:24:03 drochner Exp $ */
3
4 /*
5 * Copyright (c) 1996, 1997 Christopher G. Demetriou. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Christopher G. Demetriou
18 * for the NetBSD Project.
19 * 4. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * Copyright (c) 1992, 1993
36 * The Regents of the University of California. All rights reserved.
37 *
38 * This software was developed by the Computer Systems Engineering group
39 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
40 * contributed to Berkeley.
41 *
42 * All advertising materials mentioning features or use of this software
43 * must display the following acknowledgement:
44 * This product includes software developed by the University of
45 * California, Lawrence Berkeley Laboratory.
46 *
47 * Redistribution and use in source and binary forms, with or without
48 * modification, are permitted provided that the following conditions
49 * are met:
50 * 1. Redistributions of source code must retain the above copyright
51 * notice, this list of conditions and the following disclaimer.
52 * 2. Redistributions in binary form must reproduce the above copyright
53 * notice, this list of conditions and the following disclaimer in the
54 * documentation and/or other materials provided with the distribution.
55 * 3. Neither the name of the University nor the names of its contributors
56 * may be used to endorse or promote products derived from this software
57 * without specific prior written permission.
58 *
59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69 * SUCH DAMAGE.
70 *
71 * @(#)event_var.h 8.1 (Berkeley) 6/11/93
72 */
73
74 /*
75 * Internal "wscons_event" queue interface for the keyboard and mouse drivers.
76 * The drivers are expected not to place events in the queue above spltty(),
77 * i.e., are expected to run off serial ports or similar devices.
78 */
79
80 /* WSEVENT_QSIZE should be a power of two so that `%' is fast */
81 #define WSEVENT_QSIZE 256 /* may need tuning; this uses 2k */
82
83 struct wseventvar {
84 u_int get; /* get (read) index (modified synchronously) */
85 volatile u_int put; /* put (write) index (modified by interrupt) */
86 struct selinfo sel; /* process selecting */
87 struct proc *io; /* process that opened queue (can get SIGIO) */
88 int wanted; /* wake up on input ready */
89 int async; /* send SIGIO on input ready */
90 struct wscons_event *q; /* circular buffer (queue) of events */
91 };
92
93 #define splwsevent() spltty()
94
95 #define WSEVENT_WAKEUP(ev) { \
96 selwakeup(&(ev)->sel); \
97 if ((ev)->wanted) { \
98 (ev)->wanted = 0; \
99 wakeup((caddr_t)(ev)); \
100 } \
101 if ((ev)->async) \
102 pgsignal((ev)->io->p_pgrp, SIGIO, 0); \
103 }
104
105 void wsevent_init(struct wseventvar *);
106 void wsevent_fini(struct wseventvar *);
107 int wsevent_read(struct wseventvar *, struct uio *, int);
108 int wsevent_poll(struct wseventvar *, int, struct proc *);
109
110 /*
111 * PWSEVENT is set just above PSOCK, which is just above TTIPRI, on the
112 * theory that mouse and keyboard `user' input should be quick.
113 */
114 #define PWSEVENT 23