event.c revision 1.8
1 /* $NetBSD: event.c,v 1.8 2001/11/13 06:54:32 lukem 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.c 8.1 (Berkeley) 6/11/93 45 */ 46 47 /* 48 * Internal `Firm_event' interface for the keyboard and mouse drivers. 49 */ 50 51 #include <sys/cdefs.h> 52 __KERNEL_RCSID(0, "$NetBSD: event.c,v 1.8 2001/11/13 06:54:32 lukem Exp $"); 53 54 #include <sys/param.h> 55 #include <sys/fcntl.h> 56 #include <sys/malloc.h> 57 #include <sys/proc.h> 58 #include <sys/systm.h> 59 #include <sys/vnode.h> 60 #include <sys/select.h> 61 #include <sys/poll.h> 62 63 #include <machine/vuid_event.h> 64 #include <dev/sun/event_var.h> 65 66 int (*ev_out32_hook) __P((struct firm_event *, int, struct uio *)); 67 68 /* 69 * Initialize a firm_event queue. 70 */ 71 void 72 ev_init(ev) 73 struct evvar *ev; 74 { 75 76 ev->ev_get = ev->ev_put = 0; 77 ev->ev_q = malloc((u_long)EV_QSIZE * sizeof(struct firm_event), 78 M_DEVBUF, M_WAITOK); 79 bzero((caddr_t)ev->ev_q, EV_QSIZE * sizeof(struct firm_event)); 80 } 81 82 /* 83 * Tear down a firm_event queue. 84 */ 85 void 86 ev_fini(ev) 87 struct evvar *ev; 88 { 89 90 free(ev->ev_q, M_DEVBUF); 91 } 92 93 /* 94 * User-level interface: read, select. 95 * (User cannot write an event queue.) 96 */ 97 int 98 ev_read(ev, uio, flags) 99 struct evvar *ev; 100 struct uio *uio; 101 int flags; 102 { 103 int s, n, cnt, error; 104 105 /* 106 * Make sure we can return at least 1. 107 */ 108 if (uio->uio_resid < sizeof(struct firm_event)) 109 return (EMSGSIZE); /* ??? */ 110 s = splev(); 111 while (ev->ev_get == ev->ev_put) { 112 if (flags & IO_NDELAY) { 113 splx(s); 114 return (EWOULDBLOCK); 115 } 116 ev->ev_wanted = 1; 117 error = tsleep((caddr_t)ev, PEVENT | PCATCH, "firm_event", 0); 118 if (error) { 119 splx(s); 120 return (error); 121 } 122 } 123 /* 124 * Move firm_events from tail end of queue (there is at least one 125 * there). 126 */ 127 if (ev->ev_put < ev->ev_get) 128 cnt = EV_QSIZE - ev->ev_get; /* events in [get..QSIZE) */ 129 else 130 cnt = ev->ev_put - ev->ev_get; /* events in [get..put) */ 131 splx(s); 132 n = howmany(uio->uio_resid, sizeof(struct firm_event)); 133 if (cnt > n) 134 cnt = n; 135 if ((curproc->p_flag & P_32) && ev_out32_hook != NULL) 136 error = (*ev_out32_hook)(&ev->ev_q[ev->ev_get], cnt, uio); 137 else 138 error = uiomove((caddr_t)&ev->ev_q[ev->ev_get], 139 cnt * sizeof(struct firm_event), uio); 140 n -= cnt; 141 /* 142 * If we do not wrap to 0, used up all our space, or had an error, 143 * stop. Otherwise move from front of queue to put index, if there 144 * is anything there to move. 145 */ 146 if ((ev->ev_get = (ev->ev_get + cnt) % EV_QSIZE) != 0 || 147 n == 0 || error || (cnt = ev->ev_put) == 0) 148 return (error); 149 if (cnt > n) 150 cnt = n; 151 if ((curproc->p_flag & P_32) && ev_out32_hook != NULL) 152 error = (*ev_out32_hook)(&ev->ev_q[0], cnt, uio); 153 else 154 error = uiomove((caddr_t)&ev->ev_q[0], 155 cnt * sizeof(struct firm_event), uio); 156 ev->ev_get = cnt; 157 return (error); 158 } 159 160 int 161 ev_poll(ev, events, p) 162 struct evvar *ev; 163 int events; 164 struct proc *p; 165 { 166 int s = splev(), revents = 0; 167 168 if (events & (POLLIN | POLLRDNORM)) { 169 if (ev->ev_get == ev->ev_put) 170 selrecord(p, &ev->ev_sel); 171 else 172 revents |= events & (POLLIN | POLLRDNORM); 173 } 174 revents |= events & (POLLOUT | POLLWRNORM); 175 176 splx(s); 177 return (revents); 178 } 179
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