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Annotation of 43BSDReno/sys/hp300/cons.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 University of Utah.
        !             3:  * Copyright (c) 1990 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 is only permitted until one year after the first shipment
        !            11:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !            12:  * binary forms are permitted provided that: (1) source distributions retain
        !            13:  * this entire copyright notice and comment, and (2) distributions including
        !            14:  * binaries display the following acknowledgement:  This product includes
        !            15:  * software developed by the University of California, Berkeley and its
        !            16:  * contributors'' in the documentation or other materials provided with the
        !            17:  * distribution and in all advertising materials mentioning features or use
        !            18:  * of this software.  Neither the name of the University nor the names of
        !            19:  * its contributors may be used to endorse or promote products derived from
        !            20:  * this software without specific prior written permission.
        !            21:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            22:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            23:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            24:  *
        !            25:  * from: Utah $Hdr: cons.c 1.4 88/12/03$
        !            26:  *
        !            27:  *     @(#)cons.c      7.3 (Berkeley) 6/6/90
        !            28:  */
        !            29: 
        !            30: #include "param.h"
        !            31: #include "user.h"
        !            32: #include "systm.h"
        !            33: #include "buf.h"
        !            34: #include "ioctl.h"
        !            35: #include "tty.h"
        !            36: #include "file.h"
        !            37: #include "conf.h"
        !            38: 
        !            39: #include "cons.h"
        !            40: 
        !            41: /* XXX - all this could be autoconfig()ed */
        !            42: #include "ite.h"
        !            43: #if NITE > 0
        !            44: int itecnprobe(), itecninit(), itecngetc(), itecnputc();
        !            45: #endif
        !            46: #include "dca.h"
        !            47: #if NDCA > 0
        !            48: int dcacnprobe(), dcacninit(), dcacngetc(), dcacnputc();
        !            49: #endif
        !            50: #include "dcm.h"
        !            51: #if NDCM > 0
        !            52: int dcmcnprobe(), dcmcninit(), dcmcngetc(), dcmcnputc();
        !            53: #endif
        !            54: 
        !            55: struct consdev constab[] = {
        !            56: #if NITE > 0
        !            57:        { itecnprobe,   itecninit,      itecngetc,      itecnputc },
        !            58: #endif
        !            59: #if NDCA > 0
        !            60:        { dcacnprobe,   dcacninit,      dcacngetc,      dcacnputc },
        !            61: #endif
        !            62: #if NDCM > 0
        !            63:        { dcmcnprobe,   dcmcninit,      dcmcngetc,      dcmcnputc },
        !            64: #endif
        !            65:        { 0 },
        !            66: };
        !            67: /* end XXX */
        !            68: 
        !            69: struct tty *constty = 0;       /* virtual console output device */
        !            70: struct consdev *cn_tab;        /* physical console device info */
        !            71: struct tty *cn_tty;            /* XXX: console tty struct for tprintf */
        !            72: 
        !            73: cninit()
        !            74: {
        !            75:        register struct consdev *cp;
        !            76: 
        !            77:        /*
        !            78:         * Collect information about all possible consoles
        !            79:         * and find the one with highest priority
        !            80:         */
        !            81:        for (cp = constab; cp->cn_probe; cp++) {
        !            82:                (*cp->cn_probe)(cp);
        !            83:                if (cp->cn_pri > CN_DEAD &&
        !            84:                    (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
        !            85:                        cn_tab = cp;
        !            86:        }
        !            87:        /*
        !            88:         * No console, we can handle it
        !            89:         */
        !            90:        if ((cp = cn_tab) == NULL)
        !            91:                return;
        !            92:        /*
        !            93:         * Turn on console
        !            94:         */
        !            95:        cn_tty = cp->cn_tp;
        !            96:        (*cp->cn_init)(cp);
        !            97: }
        !            98: 
        !            99: cnopen(dev, flag)
        !           100:        dev_t dev;
        !           101: {
        !           102:        if (cn_tab == NULL)
        !           103:                return(0);
        !           104:        dev = cn_tab->cn_dev;
        !           105:        return ((*cdevsw[major(dev)].d_open)(dev, flag));
        !           106: }
        !           107:  
        !           108: cnclose(dev, flag)
        !           109:        dev_t dev;
        !           110: {
        !           111:        if (cn_tab == NULL)
        !           112:                return(0);
        !           113:        dev = cn_tab->cn_dev;
        !           114:        return ((*cdevsw[major(dev)].d_close)(dev, flag));
        !           115: }
        !           116:  
        !           117: cnread(dev, uio, flag)
        !           118:        dev_t dev;
        !           119:        struct uio *uio;
        !           120: {
        !           121:        if (cn_tab == NULL)
        !           122:                return(0);
        !           123:        dev = cn_tab->cn_dev;
        !           124:        return ((*cdevsw[major(dev)].d_read)(dev, uio, flag));
        !           125: }
        !           126:  
        !           127: cnwrite(dev, uio, flag)
        !           128:        dev_t dev;
        !           129:        struct uio *uio;
        !           130: {
        !           131:        if (cn_tab == NULL)
        !           132:                return(0);
        !           133:        dev = cn_tab->cn_dev;
        !           134:        return ((*cdevsw[major(dev)].d_write)(dev, uio, flag));
        !           135: }
        !           136:  
        !           137: cnioctl(dev, cmd, data, flag)
        !           138:        dev_t dev;
        !           139:        caddr_t data;
        !           140: {
        !           141:        int error;
        !           142: 
        !           143:        if (cn_tab == NULL)
        !           144:                return(0);
        !           145:        /*
        !           146:         * Superuser can always use this to wrest control of console
        !           147:         * output from the "virtual" console.
        !           148:         */
        !           149:        if (cmd == TIOCCONS && constty) {
        !           150:                error = suser(u.u_cred, &u.u_acflag);
        !           151:                if (error)
        !           152:                        return (error);
        !           153:                constty = NULL;
        !           154:                return (0);
        !           155:        }
        !           156:        dev = cn_tab->cn_dev;
        !           157:        return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag));
        !           158: }
        !           159: 
        !           160: /*ARGSUSED*/
        !           161: cnselect(dev, rw)
        !           162:        dev_t dev;
        !           163:        int rw;
        !           164: {
        !           165:        if (cn_tab == NULL)
        !           166:                return(1);
        !           167:        return(ttselect(cn_tab->cn_dev, rw));
        !           168: }
        !           169: 
        !           170: cngetc()
        !           171: {
        !           172:        if (cn_tab == NULL)
        !           173:                return(0);
        !           174:        return((*cn_tab->cn_getc)(cn_tab->cn_dev));
        !           175: }
        !           176: 
        !           177: cnputc(c)
        !           178:        register int c;
        !           179: {
        !           180:        if (cn_tab == NULL)
        !           181:                return;
        !           182:        if (c) {
        !           183:                (*cn_tab->cn_putc)(cn_tab->cn_dev, c);
        !           184:                if (c == '\n')
        !           185:                        (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
        !           186:        }
        !           187: }

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