kern_cons.c revision 5764
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 1.19 1994/12/18 19:42:41 joerg Exp $ 40 */ 41 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/conf.h> 45#include <sys/proc.h> 46#include <sys/tty.h> 47 48#include <machine/cons.h> 49#include <machine/stdarg.h> 50 51/* XXX - all this could be autoconfig()ed */ 52#include "sc.h" 53#include "vt.h" 54#if NSC > 0 || NVT > 0 55int pccnprobe(), pccninit(), pccngetc(), pccncheckc(), pccnputc(); 56#endif 57 58#include "sio.h" 59#if NSIO > 0 60int siocnprobe(), siocninit(), siocngetc(), siocncheckc(), siocnputc(); 61#endif 62 63static struct consdev constab[] = { 64#if NSC > 0 || NVT > 0 65 { pccnprobe, pccninit, pccngetc, pccncheckc, pccnputc }, 66#endif 67#if NSIO > 0 68 { siocnprobe, siocninit, siocngetc, siocncheckc, siocnputc }, 69#endif 70 { 0 }, 71}; 72/* end XXX */ 73 74struct tty *constty = 0; /* virtual console output device */ 75struct tty *cn_tty; /* XXX: console tty struct for tprintf */ 76 77/* XXX */ 78typedef u_char bool_t; 79typedef int d_close_t __P((dev_t dev, int fflag, int devtype, struct proc *p)); 80typedef int d_open_t __P((dev_t dev, int oflags, int devtype, struct proc *p)); 81 82static bool_t cn_is_open; /* nonzero if logical console is open */ 83static bool_t cn_phys_is_open; /* nonzero if physical console is open */ 84static d_close_t *cn_phys_close; /* physical device close function */ 85static d_open_t *cn_phys_open; /* physical device open function */ 86static struct consdev *cn_tab; /* physical console device info */ 87 88void 89cninit() 90{ 91 register struct consdev *cp; 92 struct cdevsw *cdp; 93 94 /* 95 * Collect information about all possible consoles 96 * and find the one with highest priority 97 */ 98 for (cp = constab; cp->cn_probe; cp++) { 99 (*cp->cn_probe)(cp); 100 if (cp->cn_pri > CN_DEAD && 101 (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri)) 102 cn_tab = cp; 103 } 104 /* 105 * No console, give up. 106 */ 107 if ((cp = cn_tab) == NULL) 108 return; 109 /* 110 * Hook the open and close functions. 111 */ 112 cdp = &cdevsw[major(cn_tab->cn_dev)]; 113 cn_phys_close = cdp->d_close; 114 cdp->d_close = cnclose; 115 cn_phys_open = cdp->d_open; 116 cdp->d_open = cnopen; 117 /* 118 * Turn on console 119 */ 120 cn_tty = cp->cn_tp; 121 (*cp->cn_init)(cp); 122} 123 124int 125cnopen(dev, flag, mode, p) 126 dev_t dev; 127 int flag, mode; 128 struct proc *p; 129{ 130 dev_t cndev, physdev; 131 int retval; 132 133 if (cn_tab == NULL) 134 return (0); 135 cndev = cn_tab->cn_dev; 136 physdev = (major(dev) == major(cndev) ? dev : cndev); 137 retval = (*cn_phys_open)(physdev, flag, mode, p); 138 if (retval == 0) { 139 if (dev == cndev) 140 cn_phys_is_open = 1; 141 else if (physdev == cndev) 142 cn_is_open = 1; 143 } 144 return (retval); 145} 146 147int 148cnclose(dev, flag, mode, p) 149 dev_t dev; 150 int flag, mode; 151 struct proc *p; 152{ 153 dev_t cndev; 154 155 if (cn_tab == NULL) 156 return (0); 157 cndev = cn_tab->cn_dev; 158 if (dev == cndev) { 159 cn_phys_is_open = 0; 160 if (cn_is_open) 161 return (0); 162 } else if (major(dev) != major(cndev)) { 163 cn_is_open = 0; 164 if (cn_phys_is_open) 165 return (0); 166 dev = cndev; 167 } 168 return ((*cn_phys_close)(dev, flag, mode, p)); 169} 170 171int 172cnread(dev, uio, flag) 173 dev_t dev; 174 struct uio *uio; 175 int flag; 176{ 177 if (cn_tab == NULL) 178 return (0); 179 dev = cn_tab->cn_dev; 180 return ((*cdevsw[major(dev)].d_read)(dev, uio, flag)); 181} 182 183int 184cnwrite(dev, uio, flag) 185 dev_t dev; 186 struct uio *uio; 187 int flag; 188{ 189 if (cn_tab == NULL) 190 return (0); 191 if (constty) 192 dev = constty->t_dev; 193 else 194 dev = cn_tab->cn_dev; 195 return ((*cdevsw[major(dev)].d_write)(dev, uio, flag)); 196} 197 198int 199cnioctl(dev, cmd, data, flag, p) 200 dev_t dev; 201 int cmd; 202 caddr_t data; 203 int flag; 204 struct proc *p; 205{ 206 int error; 207 208 if (cn_tab == NULL) 209 return (0); 210 /* 211 * Superuser can always use this to wrest control of console 212 * output from the "virtual" console. 213 */ 214 if (cmd == TIOCCONS && constty) { 215 error = suser(p->p_ucred, (u_short *) NULL); 216 if (error) 217 return (error); 218 constty = NULL; 219 return (0); 220 } 221 dev = cn_tab->cn_dev; 222 return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag, p)); 223} 224 225/*ARGSUSED*/ 226int 227cnselect(dev, rw, p) 228 dev_t dev; 229 int rw; 230 struct proc *p; 231{ 232 if (cn_tab == NULL) 233 return (1); 234 return (ttselect(cn_tab->cn_dev, rw, p)); 235} 236 237int 238cngetc() 239{ 240 int c; 241 if (cn_tab == NULL) 242 return (0); 243 c = (*cn_tab->cn_getc)(cn_tab->cn_dev); 244 if (c == '\r') c = '\n'; /* console input is always ICRNL */ 245 return (c); 246} 247 248int 249cncheckc() 250{ 251 if (cn_tab == NULL) 252 return (0); 253 return ((*cn_tab->cn_checkc)(cn_tab->cn_dev)); 254} 255 256void 257cnputc(c) 258 register int c; 259{ 260 if (cn_tab == NULL) 261 return; 262 if (c) { 263 (*cn_tab->cn_putc)(cn_tab->cn_dev, c); 264 if (c == '\n') 265 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r'); 266 } 267} 268 269int 270pg(const char *p, ...) { 271 va_list args; 272 va_start(args, p); 273 printf("%r\n>", p, args); 274 return(cngetc()); 275} 276 277 278