1 /* $NetBSD: event_var.h,v 1.5 2002/10/23 09:10:30 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 * @(#)event_var.h 8.1 (Berkeley) 6/11/93 45 * 46 * Header: event_var.h,v 1.5 92/11/26 01:11:51 torek Exp (LBL) 47 */ 48 49 /* 50 * Internal `Firm_event' interface for the keyboard and mouse drivers. 51 * The drivers are expected not to place events in the queue above spltty(), 52 * i.e., are expected to run off serial ports. 53 */ 54 55 /* EV_QSIZE should be a power of two so that `%' is fast */ 56 #define EV_QSIZE 256 /* may need tuning; this uses 2k */ 57 58 struct evvar { 59 u_int ev_get; /* get (read) index (modified synchronously) */ 60 volatile u_int ev_put; /* put (write) index (modified by interrupt) */ 61 struct selinfo ev_sel; /* process selecting */ 62 struct proc *ev_io; /* process that opened queue (can get SIGIO) */ 63 char ev_wanted; /* wake up on input ready */ 64 char ev_async; /* send SIGIO on input ready */ 65 struct firm_event *ev_q;/* circular buffer (queue) of events */ 66 }; 67 68 #define splev() spltty() 69 70 #define EV_WAKEUP(ev) { \ 71 selnotify(&(ev)->ev_sel, 0); \ 72 if ((ev)->ev_wanted) { \ 73 (ev)->ev_wanted = 0; \ 74 wakeup((caddr_t)(ev)); \ 75 } \ 76 if ((ev)->ev_async) \ 77 psignal((ev)->ev_io, SIGIO); \ 78 } 79 80 void ev_init(struct evvar *); 81 void ev_fini(struct evvar *); 82 int ev_read(struct evvar *, struct uio *, int); 83 int ev_poll(struct evvar *, int, struct proc *); 84 int ev_kqfilter(struct evvar *, struct knote *); 85 86 /* 87 * PEVENT is set just above PSOCK, which is just above TTIPRI, on the 88 * theory that mouse and keyboard `user' input should be quick. 89 */ 90 #define PEVENT 23 91