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arcbios_tty.c revision 1.11.6.1 
      1 /*	$NetBSD: arcbios_tty.c,v 1.11.6.1 2006/06/01 22:36:19 kardel Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 __KERNEL_RCSID(0, "$NetBSD: arcbios_tty.c,v 1.11.6.1 2006/06/01 22:36:19 kardel Exp $");
     32 
     33 #include <sys/param.h>
     34 #include <sys/user.h>
     35 #include <sys/uio.h>
     36 #include <sys/systm.h>
     37 #include <sys/callout.h>
     38 #include <sys/kernel.h>
     39 #include <sys/conf.h>
     40 #include <sys/proc.h>
     41 #include <sys/tty.h>
     42 #include <sys/termios.h>
     43 #include <sys/kauth.h>
     44 
     45 #include <dev/cons.h>
     46 
     47 #include <dev/arcbios/arcbios.h>
     48 #include <dev/arcbios/arcbiosvar.h>
     49 
     50 struct callout arcbios_tty_ch = CALLOUT_INITIALIZER;
     51 
     52 static struct tty *arcbios_tty[1];
     53 
     54 void	arcbios_tty_start(struct tty *);
     55 void	arcbios_tty_poll(void *);
     56 int	arcbios_tty_param(struct tty *, struct termios *);
     57 
     58 dev_type_open(arcbios_ttyopen);
     59 dev_type_close(arcbios_ttyclose);
     60 dev_type_read(arcbios_ttyread);
     61 dev_type_write(arcbios_ttywrite);
     62 dev_type_ioctl(arcbios_ttyioctl);
     63 dev_type_stop(arcbios_ttystop);
     64 dev_type_tty(arcbios_ttytty);
     65 dev_type_poll(arcbios_ttypoll);
     66 
     67 const struct cdevsw arcbios_cdevsw = {
     68 	arcbios_ttyopen, arcbios_ttyclose, arcbios_ttyread, arcbios_ttywrite,
     69 	arcbios_ttyioctl, arcbios_ttystop, arcbios_ttytty, arcbios_ttypoll,
     70 	nommap, ttykqfilter, D_TTY,
     71 };
     72 
     73 int
     74 arcbios_ttyopen(dev_t dev, int flag, int mode, struct lwp *l)
     75 {
     76 	int unit = minor(dev);
     77 	struct tty *tp;
     78 	int s, error = 0, setuptimeout = 0;
     79 
     80 	if (unit != 0)
     81 		return (ENODEV);
     82 
     83 	s = spltty();
     84 
     85 	if (arcbios_tty[unit] == NULL) {
     86 		tp = arcbios_tty[unit] = ttymalloc();
     87 		tty_attach(tp);
     88 	} else
     89 		tp = arcbios_tty[unit];
     90 
     91 	tp->t_oproc = arcbios_tty_start;
     92 	tp->t_param = arcbios_tty_param;
     93 	tp->t_dev = dev;
     94 	if ((tp->t_state & TS_ISOPEN) == 0) {
     95 		tp->t_state |= TS_CARR_ON;
     96 		ttychars(tp);
     97 		tp->t_iflag = TTYDEF_IFLAG;
     98 		tp->t_oflag = TTYDEF_OFLAG;
     99 		tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
    100 		tp->t_lflag = TTYDEF_LFLAG;
    101 		tp->t_ispeed = tp->t_ospeed = 9600;
    102 		ttsetwater(tp);
    103 
    104 		setuptimeout = 1;
    105 	} else if (tp->t_state & TS_XCLUDE &&
    106 	    kauth_authorize_generic(l->l_proc->p_cred, KAUTH_GENERIC_ISSUSER,
    107 	    &l->l_proc->p_acflag) != 0) {
    108 		splx(s);
    109 		return (EBUSY);
    110 	}
    111 
    112 	splx(s);
    113 
    114 	error = (*tp->t_linesw->l_open)(dev, tp);
    115 	if (error == 0 && setuptimeout)
    116 		callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
    117 
    118 	return (error);
    119 }
    120 
    121 int
    122 arcbios_ttyclose(dev_t dev, int flag, int mode, struct lwp *l)
    123 {
    124 	int unit = minor(dev);
    125 	struct tty *tp = arcbios_tty[unit];
    126 
    127 	callout_stop(&arcbios_tty_ch);
    128 	(*tp->t_linesw->l_close)(tp, flag);
    129 	ttyclose(tp);
    130 	return (0);
    131 }
    132 
    133 int
    134 arcbios_ttyread(dev_t dev, struct uio *uio, int flag)
    135 {
    136 	struct tty *tp = arcbios_tty[minor(dev)];
    137 
    138 	return ((*tp->t_linesw->l_read)(tp, uio, flag));
    139 }
    140 
    141 int
    142 arcbios_ttywrite(dev_t dev, struct uio *uio, int flag)
    143 {
    144 	struct tty *tp = arcbios_tty[minor(dev)];
    145 
    146 	return ((*tp->t_linesw->l_write)(tp, uio, flag));
    147 }
    148 
    149 int
    150 arcbios_ttypoll(dev_t dev, int events, struct lwp *l)
    151 {
    152 	struct tty *tp = arcbios_tty[minor(dev)];
    153 
    154 	return ((*tp->t_linesw->l_poll)(tp, events, l));
    155 }
    156 
    157 int
    158 arcbios_ttyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l)
    159 {
    160 	int unit = minor(dev);
    161 	struct tty *tp = arcbios_tty[unit];
    162 	int error;
    163 
    164 	error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
    165 	if (error != EPASSTHROUGH)
    166 		return (error);
    167 	return (ttioctl(tp, cmd, data, flag, l));
    168 }
    169 
    170 int
    171 arcbios_tty_param(struct tty *tp, struct termios *t)
    172 {
    173 
    174 	return (0);
    175 }
    176 
    177 void
    178 arcbios_tty_start(struct tty *tp)
    179 {
    180 	u_long count;
    181 	int s;
    182 
    183 	s = spltty();
    184 	if (tp->t_state & (TS_TTSTOP | TS_BUSY))
    185 		goto out;
    186 	if (tp->t_outq.c_cc <= tp->t_lowat) {
    187 		if (tp->t_state & TS_ASLEEP) {
    188 			tp->t_state &= ~TS_ASLEEP;
    189 			wakeup((caddr_t)&tp->t_outq);
    190 		}
    191 		selwakeup(&tp->t_wsel);
    192 	}
    193 	tp->t_state |= TS_BUSY;
    194 	while (tp->t_outq.c_cc != 0) {
    195 		(*ARCBIOS->Write)(ARCBIOS_STDOUT, tp->t_outq.c_cf,
    196 		    ndqb(&tp->t_outq, 0), &count);
    197 		ndflush(&tp->t_outq, count);
    198 	}
    199 	tp->t_state &= ~TS_BUSY;
    200  out:
    201 	splx(s);
    202 }
    203 
    204 void
    205 arcbios_ttystop(struct tty *tp, int flag)
    206 {
    207 	int s;
    208 
    209 	s = spltty();
    210 	if (tp->t_state & TS_BUSY)
    211 		if ((tp->t_state & TS_TTSTOP) == 0)
    212 			tp->t_state |= TS_FLUSH;
    213 	splx(s);
    214 }
    215 
    216 static int
    217 arcbios_tty_getchar(int *cp)
    218 {
    219 	char c;
    220 	int32_t q;
    221 	u_long count;
    222 
    223 	q = ARCBIOS->GetReadStatus(ARCBIOS_STDIN);
    224 
    225 	if (q == 0) {
    226 		ARCBIOS->Read(ARCBIOS_STDIN, &c, 1, &count);
    227 		*cp = c;
    228 
    229 		return 1;
    230 	}
    231 
    232 	return 0;
    233 }
    234 
    235 void
    236 arcbios_tty_poll(void *v)
    237 {
    238 	struct tty *tp = v;
    239 	int c, l_r;
    240 
    241 	while (arcbios_tty_getchar(&c)) {
    242 		if (tp->t_state & TS_ISOPEN)
    243 			l_r = (*tp->t_linesw->l_rint)(c, tp);
    244 	}
    245 	callout_reset(&arcbios_tty_ch, 1, arcbios_tty_poll, tp);
    246 }
    247 
    248 struct tty *
    249 arcbios_ttytty(dev_t dev)
    250 {
    251 
    252 	if (minor(dev) != 0)
    253 		panic("arcbios_ttytty: bogus");
    254 
    255 	return (arcbios_tty[0]);
    256 }
    257