event_var.h revision 1.4
1/* $NetBSD: event_var.h,v 1.4 2002/10/23 09:13:54 jdolecek 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