kern_cons.c revision 620
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 * $Id$ 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 54#include "cons.h" 55 56/* XXX - all this could be autoconfig()ed */ 57int pccnprobe(), pccninit(), pccngetc(), pccnputc(); 58#include "com.h" 59#if NCOM > 0 60int comcnprobe(), comcninit(), comcngetc(), comcnputc(); 61#endif 62 63struct consdev constab[] = { 64 { pccnprobe, pccninit, pccngetc, pccnputc }, 65#if NCOM > 0 66 { comcnprobe, comcninit, comcngetc, comcnputc }, 67#endif 68 { 0 }, 69}; 70/* end XXX */ 71 72struct tty *constty = 0; /* virtual console output device */ 73struct consdev *cn_tab; /* physical console device info */ 74struct tty *cn_tty; /* XXX: console tty struct for tprintf */ 75 76cninit() 77{ 78 register struct consdev *cp; 79 80 /* 81 * Collect information about all possible consoles 82 * and find the one with highest priority 83 */ 84 for (cp = constab; cp->cn_probe; cp++) { 85 (*cp->cn_probe)(cp); 86 if (cp->cn_pri > CN_DEAD && 87 (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri)) 88 cn_tab = cp; 89 } 90 /* 91 * No console, we can handle it 92 */ 93 if ((cp = cn_tab) == NULL) 94 return; 95 /* 96 * Turn on console 97 */ 98 cn_tty = cp->cn_tp; 99 (*cp->cn_init)(cp); 100} 101 102static struct vnode *cnopenvp = NULLVP; 103 104 105cnopen(dev, flag, mode, p) 106 dev_t dev; 107 int flag, mode; 108 struct proc *p; 109{ 110 int error; 111 112 113 if (cn_tab == NULL) 114 return (0); 115 dev = cn_tab->cn_dev; 116 if (cnopenvp == NULLVP) 117 if ((error = getdevvp(dev, &cnopenvp, VCHR))) { 118 printf("cnopen: getdevvp returned %d !\n", error); 119 return(error); 120 } 121 return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p)); 122} 123 124cnclose(dev, flag, mode, p) 125 dev_t dev; 126 int flag, mode; 127 struct proc *p; 128{ 129 int error; 130 131 132 if (cn_tab == NULL) 133 return (0); 134 dev = cn_tab->cn_dev; 135 if (vcount(cnopenvp) <= 1) 136 error = (*cdevsw[major(dev)].d_close)(dev, flag, mode, p); 137 else 138 error = 0; 139 if (error == 0) { 140 vrele(cnopenvp); 141 cnopenvp = NULLVP; 142 return(error); 143 } 144} 145 146cnread(dev, uio, flag) 147 dev_t dev; 148 struct uio *uio; 149{ 150 if (cn_tab == NULL) 151 return (0); 152 dev = cn_tab->cn_dev; 153 return ((*cdevsw[major(dev)].d_read)(dev, uio, flag)); 154} 155 156cnwrite(dev, uio, flag) 157 dev_t dev; 158 struct uio *uio; 159{ 160 if (cn_tab == NULL) 161 return (0); 162 if (constty) /* 16 Aug 92*/ 163 dev = constty->t_dev; 164 else 165 dev = cn_tab->cn_dev; 166 return ((*cdevsw[major(dev)].d_write)(dev, uio, flag)); 167} 168 169cnioctl(dev, cmd, data, flag, p) 170 dev_t dev; 171 caddr_t data; 172 struct proc *p; 173{ 174 int error; 175 176 if (cn_tab == NULL) 177 return (0); 178 /* 179 * Superuser can always use this to wrest control of console 180 * output from the "virtual" console. 181 */ 182 if (cmd == TIOCCONS && constty) { 183 error = suser(p->p_ucred, (u_short *) NULL); 184 if (error) 185 return (error); 186 constty = NULL; 187 return (0); 188 } 189 dev = cn_tab->cn_dev; 190 return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag, p)); 191} 192 193/*ARGSUSED*/ 194cnselect(dev, rw, p) 195 dev_t dev; 196 int rw; 197 struct proc *p; 198{ 199 if (cn_tab == NULL) 200 return (1); 201 return (ttselect(cn_tab->cn_dev, rw, p)); 202} 203 204cngetc() 205{ 206 if (cn_tab == NULL) 207 return (0); 208 return ((*cn_tab->cn_getc)(cn_tab->cn_dev)); 209} 210 211cnputc(c) 212 register int c; 213{ 214 if (cn_tab == NULL) 215 return; 216 if (c) { 217 (*cn_tab->cn_putc)(cn_tab->cn_dev, c); 218 if (c == '\n') 219 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r'); 220 } 221} 222 223pg(p,q,r,s,t,u,v,w,x,y,z) char *p; { 224 printf(p,q,r,s,t,u,v,w,x,y,z); 225 printf("\n>"); 226 return(cngetc()); 227} 228 229 230