kern_cons.c revision 301
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 * @(#)cons.c 7.2 (Berkeley) 5/9/91 39 * 40 * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE 41 * -------------------- ----- ---------------------- 42 * CURRENT PATCH LEVEL: 1 00083 43 * -------------------- ----- ---------------------- 44 * 45 * 16 Aug 92 Pace Willisson /dev/console redirect (xterm -C, etc.) 46 * 14 Mar 93 Chris G. Demetriou Moved pg() here from isa/pccons.c 47 */ 48 49 50#include "sys/param.h" 51#include "sys/proc.h" 52#include "sys/user.h" 53#include "sys/systm.h" 54#include "sys/buf.h" 55#include "sys/ioctl.h" 56#include "sys/tty.h" 57#include "sys/file.h" 58#include "sys/conf.h" 59#include "sys/vnode.h" 60 61#include "cons.h" 62 63/* XXX - all this could be autoconfig()ed */ 64int pccnprobe(), pccninit(), pccngetc(), pccnputc(); 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 NCOM > 0 73 { comcnprobe, comcninit, comcngetc, comcnputc }, 74#endif 75 { 0 }, 76}; 77/* end XXX */ 78 79struct tty *constty = 0; /* virtual console output device */ 80struct consdev *cn_tab; /* physical console device info */ 81struct tty *cn_tty; /* XXX: console tty struct for tprintf */ 82 83cninit() 84{ 85 register struct consdev *cp; 86 87 /* 88 * Collect information about all possible consoles 89 * and find the one with highest priority 90 */ 91 for (cp = constab; cp->cn_probe; cp++) { 92 (*cp->cn_probe)(cp); 93 if (cp->cn_pri > CN_DEAD && 94 (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri)) 95 cn_tab = cp; 96 } 97 /* 98 * No console, we can handle it 99 */ 100 if ((cp = cn_tab) == NULL) 101 return; 102 /* 103 * Turn on console 104 */ 105 cn_tty = cp->cn_tp; 106 (*cp->cn_init)(cp); 107} 108 109static struct vnode *cnopenvp = NULLVP; 110 111 112cnopen(dev, flag, mode, p) 113 dev_t dev; 114 int flag, mode; 115 struct proc *p; 116{ 117 int error; 118 119 120 if (cn_tab == NULL) 121 return (0); 122 dev = cn_tab->cn_dev; 123 if (cnopenvp == NULLVP) 124 if ((error = getdevvp(dev, &cnopenvp, VCHR))) { 125 printf("cnopen: getdevvp returned %d !\n", error); 126 return(error); 127 } 128 return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p)); 129} 130 131cnclose(dev, flag, mode, p) 132 dev_t dev; 133 int flag, mode; 134 struct proc *p; 135{ 136 int error; 137 138 139 if (cn_tab == NULL) 140 return (0); 141 dev = cn_tab->cn_dev; 142 if (vcount(cnopenvp) <= 1) 143 error = (*cdevsw[major(dev)].d_close)(dev, flag, mode, p); 144 else 145 error = 0; 146 if (error == 0) { 147 vrele(cnopenvp); 148 cnopenvp = NULLVP; 149 return(error); 150 } 151} 152 153cnread(dev, uio, flag) 154 dev_t dev; 155 struct uio *uio; 156{ 157 if (cn_tab == NULL) 158 return (0); 159 dev = cn_tab->cn_dev; 160 return ((*cdevsw[major(dev)].d_read)(dev, uio, flag)); 161} 162 163cnwrite(dev, uio, flag) 164 dev_t dev; 165 struct uio *uio; 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 176cnioctl(dev, cmd, data, flag, p) 177 dev_t dev; 178 caddr_t data; 179 struct proc *p; 180{ 181 int error; 182 183 if (cn_tab == NULL) 184 return (0); 185 /* 186 * Superuser can always use this to wrest control of console 187 * output from the "virtual" console. 188 */ 189 if (cmd == TIOCCONS && constty) { 190 error = suser(p->p_ucred, (u_short *) NULL); 191 if (error) 192 return (error); 193 constty = NULL; 194 return (0); 195 } 196 dev = cn_tab->cn_dev; 197 return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag, p)); 198} 199 200/*ARGSUSED*/ 201cnselect(dev, rw, p) 202 dev_t dev; 203 int rw; 204 struct proc *p; 205{ 206 if (cn_tab == NULL) 207 return (1); 208 return (ttselect(cn_tab->cn_dev, rw, p)); 209} 210 211cngetc() 212{ 213 if (cn_tab == NULL) 214 return (0); 215 return ((*cn_tab->cn_getc)(cn_tab->cn_dev)); 216} 217 218cnputc(c) 219 register int c; 220{ 221 if (cn_tab == NULL) 222 return; 223 if (c) { 224 (*cn_tab->cn_putc)(cn_tab->cn_dev, c); 225 if (c == '\n') 226 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r'); 227 } 228} 229 230pg(p,q,r,s,t,u,v,w,x,y,z) char *p; { 231 printf(p,q,r,s,t,u,v,w,x,y,z); 232 printf("\n>"); 233 return(cngetc()); 234} 235 236 237