kern_cons.c revision 2415
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 1.13 1994/08/13 03:49:34 wollman Exp $ 40 */ 41 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/proc.h> 46#include <sys/user.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 65struct consdev constab[] = { 66 { pccnprobe, pccninit, pccngetc, pccnputc }, 67#if NSIO > 0 68 { siocnprobe, siocninit, siocngetc, siocnputc }, 69#endif 70 { 0 }, 71}; 72/* end XXX */ 73 74struct tty *constty = 0; /* virtual console output device */ 75struct consdev *cn_tab; /* physical console device info */ 76struct tty *cn_tty; /* XXX: console tty struct for tprintf */ 77 78void 79cninit() 80{ 81 register struct consdev *cp; 82 83 /* 84 * Collect information about all possible consoles 85 * and find the one with highest priority 86 */ 87 for (cp = constab; cp->cn_probe; cp++) { 88 (*cp->cn_probe)(cp); 89 if (cp->cn_pri > CN_DEAD && 90 (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri)) 91 cn_tab = cp; 92 } 93 /* 94 * No console, we can handle it 95 */ 96 if ((cp = cn_tab) == NULL) 97 return; 98 /* 99 * Turn on console 100 */ 101 cn_tty = cp->cn_tp; 102 (*cp->cn_init)(cp); 103} 104 105int 106cnopen(dev, flag, mode, p) 107 dev_t dev; 108 int flag, mode; 109 struct proc *p; 110{ 111 struct vnode *vp = 0; 112 113 if (cn_tab == NULL) 114 return (0); 115 116 dev = cn_tab->cn_dev; 117 if (vfinddev(dev, VCHR, &vp) && vcount(vp)) 118 return (0); 119 120 return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p)); 121} 122 123int 124cnclose(dev, flag, mode, p) 125 dev_t dev; 126 int flag, mode; 127 struct proc *p; 128{ 129 struct vnode *vp = 0; 130 131 if (cn_tab == NULL) 132 return (0); 133 134 dev = cn_tab->cn_dev; 135 if (vfinddev(dev, VCHR, &vp) && vcount(vp)) 136 return (0); 137 138 return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, p)); 139} 140 141int 142cnread(dev, uio, flag) 143 dev_t dev; 144 struct uio *uio; 145 int flag; 146{ 147 if (cn_tab == NULL) 148 return (0); 149 dev = cn_tab->cn_dev; 150 return ((*cdevsw[major(dev)].d_read)(dev, uio, flag)); 151} 152 153int 154cnwrite(dev, uio, flag) 155 dev_t dev; 156 struct uio *uio; 157 int flag; 158{ 159 if (cn_tab == NULL) 160 return (0); 161 if (constty) 162 dev = constty->t_dev; 163 else 164 dev = cn_tab->cn_dev; 165 return ((*cdevsw[major(dev)].d_write)(dev, uio, flag)); 166} 167 168int 169cnioctl(dev, cmd, data, flag, p) 170 dev_t dev; 171 int cmd; 172 caddr_t data; 173 int flag; 174 struct proc *p; 175{ 176 int error; 177 178 if (cn_tab == NULL) 179 return (0); 180 /* 181 * Superuser can always use this to wrest control of console 182 * output from the "virtual" console. 183 */ 184 if (cmd == TIOCCONS && constty) { 185 error = suser(p->p_ucred, (u_short *) NULL); 186 if (error) 187 return (error); 188 constty = NULL; 189 return (0); 190 } 191 dev = cn_tab->cn_dev; 192 return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag, p)); 193} 194 195/*ARGSUSED*/ 196int 197cnselect(dev, rw, p) 198 dev_t dev; 199 int rw; 200 struct proc *p; 201{ 202 if (cn_tab == NULL) 203 return (1); 204 return (ttselect(cn_tab->cn_dev, rw, p)); 205} 206 207int 208cngetc() 209{ 210 if (cn_tab == NULL) 211 return (0); 212 return ((*cn_tab->cn_getc)(cn_tab->cn_dev)); 213} 214 215void 216cnputc(c) 217 register int c; 218{ 219 if (cn_tab == NULL) 220 return; 221 if (c) { 222 (*cn_tab->cn_putc)(cn_tab->cn_dev, c); 223 if (c == '\n') 224 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r'); 225 } 226} 227 228int 229pg(const char *p, ...) { 230 va_list args; 231 va_start(args, p); 232 printf("%r\n>", p, args); 233 return(cngetc()); 234} 235 236 237