kern_cons.c revision 1007
1/* 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1991 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the Systems Programming Group of the University of Utah Computer 8 * Science Department. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: @(#)cons.c 7.2 (Berkeley) 5/9/91 39 * $Id: cons.c,v 1.9 1994/01/23 17:50:11 davidg Exp $ 40 */ 41 42 43#include "sys/param.h" 44#include "sys/proc.h" 45#include "sys/user.h" 46#include "sys/systm.h" 47#include "sys/buf.h" 48#include "sys/ioctl.h" 49#include "sys/tty.h" 50#include "sys/file.h" 51#include "sys/conf.h" 52#include "sys/vnode.h" 53#include "machine/stdarg.h" 54 55#include "machine/cons.h" 56 57/* XXX - all this could be autoconfig()ed */ 58int pccnprobe(), pccninit(), pccngetc(), pccnputc(); 59 60#include "sio.h" 61#if NSIO > 0 62int siocnprobe(), siocninit(), siocngetc(), siocnputc(); 63#endif 64 65#include "com.h" 66#if NCOM > 0 67int comcnprobe(), comcninit(), comcngetc(), comcnputc(); 68#endif 69 70struct consdev constab[] = { 71 { pccnprobe, pccninit, pccngetc, pccnputc }, 72#if NSIO > 0 73 { siocnprobe, siocninit, siocngetc, siocnputc }, 74#endif 75#if NCOM > 0 76 { comcnprobe, comcninit, comcngetc, comcnputc }, 77#endif 78 { 0 }, 79}; 80/* end XXX */ 81 82struct tty *constty = 0; /* virtual console output device */ 83struct consdev *cn_tab; /* physical console device info */ 84struct tty *cn_tty; /* XXX: console tty struct for tprintf */ 85 86void 87cninit() 88{ 89 register struct consdev *cp; 90 91 /* 92 * Collect information about all possible consoles 93 * and find the one with highest priority 94 */ 95 for (cp = constab; cp->cn_probe; cp++) { 96 (*cp->cn_probe)(cp); 97 if (cp->cn_pri > CN_DEAD && 98 (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri)) 99 cn_tab = cp; 100 } 101 /* 102 * No console, we can handle it 103 */ 104 if ((cp = cn_tab) == NULL) 105 return; 106 /* 107 * Turn on console 108 */ 109 cn_tty = cp->cn_tp; 110 (*cp->cn_init)(cp); 111} 112 113int 114cnopen(dev, flag, mode, p) 115 dev_t dev; 116 int flag, mode; 117 struct proc *p; 118{ 119 struct vnode *vp = 0; 120 121 if (cn_tab == NULL) 122 return (0); 123 124 dev = cn_tab->cn_dev; 125 if ((vfinddev(dev, VCHR, &vp) == 0) && vcount(vp)) 126 return (0); 127 128 return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p)); 129} 130 131int 132cnclose(dev, flag, mode, p) 133 dev_t dev; 134 int flag, mode; 135 struct proc *p; 136{ 137 struct vnode *vp = 0; 138 139 if (cn_tab == NULL) 140 return (0); 141 142 dev = cn_tab->cn_dev; 143 if ((vfinddev(dev, VCHR, &vp) == 0) && vcount(vp)) 144 return (0); 145 146 return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, p)); 147} 148 149int 150cnread(dev, uio, flag) 151 dev_t dev; 152 struct uio *uio; 153 int flag; 154{ 155 if (cn_tab == NULL) 156 return (0); 157 dev = cn_tab->cn_dev; 158 return ((*cdevsw[major(dev)].d_read)(dev, uio, flag)); 159} 160 161int 162cnwrite(dev, uio, flag) 163 dev_t dev; 164 struct uio *uio; 165 int flag; 166{ 167 if (cn_tab == NULL) 168 return (0); 169 if (constty) /* 16 Aug 92*/ 170 dev = constty->t_dev; 171 else 172 dev = cn_tab->cn_dev; 173 return ((*cdevsw[major(dev)].d_write)(dev, uio, flag)); 174} 175 176int 177cnioctl(dev, cmd, data, flag, p) 178 dev_t dev; 179 int cmd; 180 caddr_t data; 181 int flag; 182 struct proc *p; 183{ 184 int error; 185 186 if (cn_tab == NULL) 187 return (0); 188 /* 189 * Superuser can always use this to wrest control of console 190 * output from the "virtual" console. 191 */ 192 if (cmd == TIOCCONS && constty) { 193 error = suser(p->p_ucred, (u_short *) NULL); 194 if (error) 195 return (error); 196 constty = NULL; 197 return (0); 198 } 199 dev = cn_tab->cn_dev; 200 return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag, p)); 201} 202 203/*ARGSUSED*/ 204int 205cnselect(dev, rw, p) 206 dev_t dev; 207 int rw; 208 struct proc *p; 209{ 210 if (cn_tab == NULL) 211 return (1); 212 return (ttselect(cn_tab->cn_dev, rw, p)); 213} 214 215int 216cngetc() 217{ 218 if (cn_tab == NULL) 219 return (0); 220 return ((*cn_tab->cn_getc)(cn_tab->cn_dev)); 221} 222 223void 224cnputc(c) 225 register int c; 226{ 227 if (cn_tab == NULL) 228 return; 229 if (c) { 230 (*cn_tab->cn_putc)(cn_tab->cn_dev, c); 231 if (c == '\n') 232 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r'); 233 } 234} 235 236int 237pg(const char *p, ...) { 238 va_list args; 239 va_start(args, p); 240 printf("%r\n>", p, args); 241 return(cngetc()); 242} 243 244 245