1 /* $OpenBSD: cninit.c,v 1.4 1998/06/17 14:58:35 mickey Exp $ */ 2 /* $NetBSD: cninit.c,v 1.2 1995/04/11 22:08:10 pk Exp $ */ 3 4 /* 5 * Copyright (c) 1988 University of Utah. 6 * Copyright (c) 1990, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * the Systems Programming Group of the University of Utah Computer 11 * Science Department. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * from: Utah $Hdr: cons.c 1.7 92/01/21$ 42 * 43 * @(#)cons.c 8.2 (Berkeley) 1/12/94 44 */ 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/proc.h> 49 #include <sys/user.h> 50 #include <sys/buf.h> 51 #include <sys/ioctl.h> 52 #include <sys/tty.h> 53 #include <sys/file.h> 54 #include <sys/conf.h> 55 #include <sys/vnode.h> 56 57 #include <dev/cons.h> 58 59 extern struct consdev constab[]; 60 61 extern struct consdev *cn_tab; /* physical console device info */ 62 63 void 64 cninit() 65 { 66 register struct consdev *cp; 67 68 /* 69 * Collect information about all possible consoles 70 * and find the one with highest priority 71 */ 72 for (cp = constab; cp->cn_probe; cp++) { 73 (*cp->cn_probe)(cp); 74 if (cp->cn_pri > CN_DEAD && 75 (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri)) 76 cn_tab = cp; 77 } 78 /* 79 * No console, we can handle it 80 */ 81 if ((cp = cn_tab) == NULL) 82 return; 83 /* 84 * Turn on console 85 */ 86 (*cp->cn_init)(cp); 87 } 88 89 int 90 cnset(dev) 91 dev_t dev; 92 { 93 struct consdev *cp; 94 95 /* 96 * Look for the specified console device and use it. 97 */ 98 for (cp = constab; cp->cn_probe; cp++) { 99 if (major(cp->cn_dev) == major(dev)) { 100 /* short-circuit noop */ 101 if (cp == cn_tab && cp->cn_dev == dev) 102 return (0); 103 if (cp->cn_pri > CN_DEAD) { 104 cn_tab = cp; 105 cp->cn_dev = dev; 106 /* Turn it on. */ 107 (cp->cn_init)(cp); 108 return (0); 109 } 110 break; 111 } 112 } 113 return (1); 114 } 115