1 /* $OpenBSD: cons.c,v 1.14 2010/05/09 15:30:28 jsg 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. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * form: OpenBSD: cons.c,v 1.7 1996/04/21 22:19:48 37 * from: OpenBSD: cninit.c,v 1.2 1996/03/30 02:03:45 38 * from: Utah $Hdr: cons.c 1.7 92/01/21$ 39 * 40 * @(#)cons.c 8.2 (Berkeley) 1/12/94 41 */ 42 43 #include <sys/param.h> 44 #include "stand.h" 45 #include <dev/cons.h> 46 47 extern struct consdev constab[]; 48 49 void 50 cninit(void) 51 { 52 struct consdev *cp; 53 54 /* 55 * Collect information about all possible consoles 56 * and find the one with highest priority 57 */ 58 for (cp = constab; cp->cn_probe; cp++) { 59 (*cp->cn_probe)(cp); 60 if (cp->cn_pri != CN_DEAD && 61 (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri)) 62 cn_tab = cp; 63 } 64 /* 65 * No console, we can handle it 66 */ 67 if ((cp = cn_tab) == NULL) 68 return; 69 /* 70 * Turn on console 71 */ 72 (*cp->cn_init)(cp); 73 } 74 75 int 76 cnset(dev_t dev) 77 { 78 struct consdev *cp; 79 80 /* 81 * Look for the specified console device and use it. 82 */ 83 for (cp = constab; cp->cn_probe; cp++) { 84 if (major(cp->cn_dev) == major(dev)) { 85 /* short-circuit noop */ 86 if (cp == cn_tab && cp->cn_dev == dev) 87 return (0); 88 if (cp->cn_pri != CN_DEAD) { 89 cn_tab = cp; 90 cp->cn_dev = dev; 91 /* Turn it on. */ 92 (*cp->cn_init)(cp); 93 return (0); 94 } 95 break; 96 } 97 } 98 return (1); 99 } 100 101 int 102 cngetc(void) 103 { 104 if (cn_tab == NULL) 105 return (0); 106 return ((*cn_tab->cn_getc)(cn_tab->cn_dev)); 107 } 108 109 void 110 cnputc(int c) 111 { 112 if (cn_tab != NULL && c) { 113 (*cn_tab->cn_putc)(cn_tab->cn_dev, c); 114 if (c == '\n') 115 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r'); 116 } 117 } 118 119 int 120 cnischar(void) 121 { 122 if (cn_tab != NULL) 123 return ((*cn_tab->cn_getc)(cn_tab->cn_dev|0x80)); 124 return 0; 125 } 126