event_var.h revision 1.6 
1/*	$NetBSD: event_var.h,v 1.6 2003/06/29 22:30:48 fvdl Exp $	*/
2
3/*
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
10 *
11 * All advertising materials mentioning features or use of this software
12 * must display the following acknowledgement:
13 *	This product includes software developed by the University of
14 *	California, Lawrence Berkeley Laboratory.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 *    notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 *    notice, this list of conditions and the following disclaimer in the
23 *    documentation and/or other materials provided with the distribution.
24 * 3. All advertising materials mentioning features or use of this software
25 *    must display the following acknowledgement:
26 *	This product includes software developed by the University of
27 *	California, Berkeley and its contributors.
28 * 4. Neither the name of the University nor the names of its contributors
29 *    may be used to endorse or promote products derived from this software
30 *    without specific prior written permission.
31 *
32 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
35 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 * SUCH DAMAGE.
43 *
44 *	from: @(#)event_var.h	8.1 (Berkeley) 6/11/93
45 *	from: Hdr: event_var.h,v 1.5 92/11/26 01:11:51 torek Exp  (LBL)
46 */
47
48/*
49 * Internal `Firm_event' interface for the keyboard and mouse drivers.
50 * The drivers are expected not to place events in the queue above spltty(),
51 * i.e., are expected to run off serial ports.
52 */
53
54/* EV_QSIZE should be a power of two so that `%' is fast */
55#define	EV_QSIZE	256	/* may need tuning; this uses 2k */
56
57struct evvar {
58	u_int	ev_get;		/* get (read) index (modified synchronously) */
59	volatile u_int ev_put;	/* put (write) index (modified by interrupt) */
60	struct	selinfo ev_sel;	/* process selecting */
61	struct	proc *ev_io;	/* process that opened queue (can get SIGIO) */
62	char	ev_wanted;	/* wake up on input ready */
63	char	ev_async;	/* send SIGIO on input ready */
64	struct	firm_event *ev_q;/* circular buffer (queue) of events */
65};
66
67#define	splev()	spltty()
68
69#define	EV_WAKEUP(ev) { \
70	selnotify(&(ev)->ev_sel, 0); \
71	if ((ev)->ev_wanted) { \
72		(ev)->ev_wanted = 0; \
73		wakeup((caddr_t)(ev)); \
74	} \
75	if ((ev)->ev_async) \
76		psignal((ev)->ev_io, SIGIO); \
77}
78
79void	ev_init __P((struct evvar *));
80void	ev_fini __P((struct evvar *));
81int	ev_read __P((struct evvar *, struct uio *, int));
82int	ev_poll __P((struct evvar *, int, struct proc *));
83int	ev_kqfilter __P((struct evvar *, struct knote *));
84
85/*
86 * Hook for 32-bit compatibility on a 64-bit kernel.
87 */
88extern	int (*ev_out32_hook) __P((struct firm_event *, int, struct uio *));
89
90/*
91 * PEVENT is set just above PSOCK, which is just above TTIPRI, on the
92 * theory that mouse and keyboard `user' input should be quick.
93 */
94#define	PEVENT	23
95