1 /* $OpenBSD: cons.c,v 1.9 1997/08/13 14:18:09 niklas Exp $ */ 2 3 /* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * form: OpenBSD: cons.c,v 1.7 1996/04/21 22:19:48 41 * from: OpenBSD: cninit.c,v 1.2 1996/03/30 02:03:45 42 * from: Utah $Hdr: cons.c 1.7 92/01/21$ 43 * 44 * @(#)cons.c 8.2 (Berkeley) 1/12/94 45 */ 46 47 #include <sys/param.h> 48 #include "stand.h" 49 #include <dev/cons.h> 50 51 void 52 cninit() 53 { 54 register struct consdev *cp; 55 56 /* 57 * Collect information about all possible consoles 58 * and find the one with highest priority 59 */ 60 for (cp = constab; cp->cn_probe; cp++) { 61 (*cp->cn_probe)(cp); 62 if (cp->cn_pri > CN_DEAD && 63 (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri)) 64 cn_tab = cp; 65 } 66 /* 67 * No console, we can handle it 68 */ 69 if ((cp = cn_tab) == NULL) 70 return; 71 /* 72 * Turn on console 73 */ 74 (*cp->cn_init)(cp); 75 } 76 77 int 78 cnset(dev) 79 dev_t dev; 80 { 81 struct consdev *cp; 82 83 /* 84 * Look for the specified console device and use it. 85 */ 86 for (cp = constab; cp->cn_probe; cp++) { 87 if (major(cp->cn_dev) == major(dev)) { 88 /* short-circuit noop */ 89 if (cp == cn_tab && cp->cn_dev == dev) 90 return (0); 91 if (cp->cn_pri > CN_DEAD) { 92 cn_tab = cp; 93 cp->cn_dev = dev; 94 /* Turn it on. */ 95 (cp->cn_init)(cp); 96 return (0); 97 } 98 break; 99 } 100 } 101 return (1); 102 } 103 104 int 105 cngetc() 106 { 107 if (cn_tab == NULL) 108 return (0); 109 return ((*cn_tab->cn_getc)(cn_tab->cn_dev)); 110 } 111 112 void 113 cnputc(c) 114 register int c; 115 { 116 if (cn_tab != NULL && c) { 117 (*cn_tab->cn_putc)(cn_tab->cn_dev, c); 118 if (c == '\n') 119 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r'); 120 } 121 } 122 123 int 124 cnischar() 125 { 126 if (cn_tab != NULL) 127 return ((*cn_tab->cn_getc)(cn_tab->cn_dev|0x80)); 128 else 129 return 0; 130 } 131