kern_cons.c revision 798
1139823Simp/* 22788Sdg * Copyright (c) 1988 University of Utah. 32788Sdg * Copyright (c) 1991 The Regents of the University of California. 42788Sdg * All rights reserved. 52788Sdg * 62788Sdg * This code is derived from software contributed to Berkeley by 72788Sdg * the Systems Programming Group of the University of Utah Computer 82788Sdg * Science Department. 92788Sdg * 102788Sdg * Redistribution and use in source and binary forms, with or without 112788Sdg * modification, are permitted provided that the following conditions 122788Sdg * are met: 132788Sdg * 1. Redistributions of source code must retain the above copyright 142788Sdg * notice, this list of conditions and the following disclaimer. 152788Sdg * 2. Redistributions in binary form must reproduce the above copyright 162788Sdg * notice, this list of conditions and the following disclaimer in the 172788Sdg * documentation and/or other materials provided with the distribution. 182788Sdg * 3. All advertising materials mentioning features or use of this software 192788Sdg * must display the following acknowledgement: 202788Sdg * This product includes software developed by the University of 212788Sdg * California, Berkeley and its contributors. 222788Sdg * 4. Neither the name of the University nor the names of its contributors 232788Sdg * may be used to endorse or promote products derived from this software 242788Sdg * without specific prior written permission. 252788Sdg * 262788Sdg * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 272788Sdg * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 282788Sdg * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2910941Swollman * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 302788Sdg * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 311541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32172467Ssilby * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33172467Ssilby * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34172467Ssilby * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35118622Shsu * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3655009Sshin * SUCH DAMAGE. 37220746Sbz * 3855009Sshin * from: @(#)cons.c 7.2 (Berkeley) 5/9/91 39163953Srrs * $Id: cons.c,v 1.5 1993/11/07 17:41:32 wollman Exp $ 40178167Sqingli */ 4130966Sjoerg 422788Sdg 43111145Sjlemon#include "sys/param.h" 448426Swollman#include "sys/proc.h" 452788Sdg#include "sys/user.h" 462788Sdg#include "sys/systm.h" 47185895Szec#include "sys/buf.h" 4812426Sphk#include "sys/ioctl.h" 4944078Sdfr#include "sys/tty.h" 5012172Sphk#include "sys/file.h" 511541Srgrimes#include "sys/conf.h" 52220746Sbz#include "machine/stdarg.h" 53220746Sbz 54220746Sbz#include "machine/cons.h" 55220746Sbz 56220746Sbz/* XXX - all this could be autoconfig()ed */ 57220746Sbzint pccnprobe(), pccninit(), pccngetc(), pccnputc(); 58220746Sbz#include "com.h" 592788Sdg#if NCOM > 0 60257176Sglebiusint comcnprobe(), comcninit(), comcngetc(), comcnputc(); 612788Sdg#endif 62178167Sqingli 63178167Sqinglistruct consdev constab[] = { 64178167Sqingli { pccnprobe, pccninit, pccngetc, pccnputc }, 65196019Srwatson#if NCOM > 0 66221021Sbz { comcnprobe, comcninit, comcngetc, comcnputc }, 671541Srgrimes#endif 68221021Sbz { 0 }, 692788Sdg}; 70221021Sbz/* end XXX */ 71221021Sbz 72221021Sbzstruct tty *constty = 0; /* virtual console output device */ 732788Sdgstruct consdev *cn_tab; /* physical console device info */ 74186119Sqinglistruct tty *cn_tty; /* XXX: console tty struct for tprintf */ 752788Sdg 762788Sdgvoid 772788Sdgcninit() 782788Sdg{ 792788Sdg register struct consdev *cp; 802788Sdg 812788Sdg /* 822788Sdg * Collect information about all possible consoles 832788Sdg * and find the one with highest priority 8462587Sitojun */ 8555009Sshin for (cp = constab; cp->cn_probe; cp++) { 862788Sdg (*cp->cn_probe)(cp); 872788Sdg if (cp->cn_pri > CN_DEAD && 882788Sdg (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri)) 891541Srgrimes cn_tab = cp; 90148918Sobrien } 91148918Sobrien /* 92171167Sgnn * No console, we can handle it 93105199Ssam */ 94171167Sgnn if ((cp = cn_tab) == NULL) 95105199Ssam return; 96163953Srrs /* 97163953Srrs * Turn on console 98163953Srrs */ 99163953Srrs cn_tty = cp->cn_tp; 100163953Srrs (*cp->cn_init)(cp); 101163953Srrs} 102163953Srrs 103222272Sbzint 104222272Sbzcnopen(dev, flag, mode, p) 1052788Sdg dev_t dev; 1062531Swollman int flag, mode; 107136695Sandre struct proc *p; 108152242Sru{ 109152242Sru if (cn_tab == NULL) 110152242Sru return (0); 111152242Sru dev = cn_tab->cn_dev; 112152242Sru return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p)); 113136695Sandre} 114136695Sandre 11582884Sjulianint 116152242Srucnclose(dev, flag, mode, p) 117152242Sru dev_t dev; 118152242Sru int flag, mode; 119152242Sru struct proc *p; 120152242Sru{ 121204140Sbz if (cn_tab == NULL) 122204140Sbz return (0); 123204140Sbz dev = cn_tab->cn_dev; 124152242Sru return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, p)); 125152242Sru} 126152242Sru 1272788Sdgint 128152242Srucnread(dev, uio, flag) 129152242Sru dev_t dev; 130152242Sru struct uio *uio; 131152242Sru int flag; 132152242Sru{ 133152242Sru if (cn_tab == NULL) 134152242Sru return (0); 135194062Svanhu dev = cn_tab->cn_dev; 136152242Sru return ((*cdevsw[major(dev)].d_read)(dev, uio, flag)); 137193731Szec} 138193731Szec 139193731Szecint 140152242Srucnwrite(dev, uio, flag) 1412788Sdg dev_t dev; 142152242Sru struct uio *uio; 143152242Sru int flag; 144152242Sru{ 145152242Sru if (cn_tab == NULL) 146152242Sru return (0); 147152242Sru if (constty) /* 16 Aug 92*/ 148152242Sru dev = constty->t_dev; 149152242Sru else 150152242Sru dev = cn_tab->cn_dev; 151193731Szec return ((*cdevsw[major(dev)].d_write)(dev, uio, flag)); 152193731Szec} 153193731Szec 154152242Sruint 155152242Srucnioctl(dev, cmd, data, flag, p) 156152242Sru dev_t dev; 1572788Sdg int cmd; 158163953Srrs caddr_t data; 159163953Srrs int flag; 160223963Stuexen struct proc *p; 161197326Stuexen{ 162197326Stuexen int error; 163197326Stuexen 164197326Stuexen if (cn_tab == NULL) 165197326Stuexen return (0); 166197326Stuexen /* 167197326Stuexen * Superuser can always use this to wrest control of console 168197326Stuexen * output from the "virtual" console. 169197326Stuexen */ 170197326Stuexen if (cmd == TIOCCONS && constty) { 171197326Stuexen error = suser(p->p_ucred, (u_short *) NULL); 172197326Stuexen if (error) 173163953Srrs return (error); 174163953Srrs constty = NULL; 175197326Stuexen return (0); 176197326Stuexen } 177197326Stuexen dev = cn_tab->cn_dev; 178197326Stuexen return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag, p)); 179197326Stuexen} 180197326Stuexen 181197326Stuexen/*ARGSUSED*/ 182197326Stuexenint 183197326Stuexencnselect(dev, rw, p) 184163953Srrs dev_t dev; 185163953Srrs int rw; 186163953Srrs struct proc *p; 187264212Skevlo{ 188264212Skevlo if (cn_tab == NULL) 189264212Skevlo return (1); 190264212Skevlo return (ttselect(cn_tab->cn_dev, rw, p)); 191264212Skevlo} 192264212Skevlo 193264212Skevloint 194264212Skevlocngetc() 195264212Skevlo{ 196264212Skevlo if (cn_tab == NULL) 197264212Skevlo return (0); 198264212Skevlo return ((*cn_tab->cn_getc)(cn_tab->cn_dev)); 199264212Skevlo} 200264212Skevlo 201152242Sruvoid 202152242Srucnputc(c) 203152242Sru register int c; 204152242Sru{ 205152242Sru if (cn_tab == NULL) 206152242Sru return; 207152242Sru if (c) { 208152242Sru (*cn_tab->cn_putc)(cn_tab->cn_dev, c); 2092788Sdg if (c == '\n') 210152242Sru (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r'); 211152242Sru } 212152242Sru} 213152242Sru 214152242Sruint 215152242Srupg(const char *p, ...) { 216152242Sru va_list args; 217152242Sru va_start(args, p); 2182788Sdg printf("%r\n>", p, args); 219152242Sru return(cngetc()); 220152242Sru} 221152242Sru 222152242Sru 223152242Sru