summaryrefslogtreecommitdiff
path: root/sys/kern/tty_conf.c
blob: edb691aaf013e4caec5c511f0830aee981909425 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
/*	$NetBSD: tty_conf.c,v 1.43 2003/08/07 16:31:56 agc Exp $	*/

/*-
 * Copyright (c) 1982, 1986, 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)tty_conf.c	8.5 (Berkeley) 1/9/95
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tty_conf.c,v 1.43 2003/08/07 16:31:56 agc Exp $");

#include "opt_compat_freebsd.h"
#include "opt_compat_43.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/tty.h>
#include <sys/ioctl.h>
#include <sys/ttycom.h>
#include <sys/conf.h>
#include <sys/malloc.h>

#include "tb.h"
#if NTB > 0
int	tbopen __P((dev_t dev, struct tty *tp));
int	tbclose __P((struct tty *tp, int flags));
int	tbread __P((struct tty *tp, struct uio *uio, int flags));
int	tbtioctl __P((struct tty *tp, u_long cmd, caddr_t data,
			int flag, struct proc *p));
int	tbinput __P((int c, struct tty *tp));
#endif

#include "sl.h"
#if NSL > 0
int	slopen __P((dev_t dev, struct tty *tp));
int	slclose __P((struct tty *tp, int flags));
int	sltioctl __P((struct tty *tp, u_long cmd, caddr_t data,
			int flag, struct proc *p));
int	slinput __P((int c, struct tty *tp));
int	slstart __P((struct tty *tp));
#endif

#include "ppp.h"
#if NPPP > 0
int	pppopen __P((dev_t dev, struct tty *tp));
int	pppclose __P((struct tty *tp, int flags));
int	ppptioctl __P((struct tty *tp, u_long cmd, caddr_t data,
			int flag, struct proc *p));
int	pppinput __P((int c, struct tty *tp));
int	pppstart __P((struct tty *tp));
int	pppread __P((struct tty *tp, struct uio *uio, int flag));
int	pppwrite __P((struct tty *tp, struct uio *uio, int flag));
#endif

#include "strip.h"
#if NSTRIP > 0
int	stripopen __P((dev_t dev, struct tty *tp));
int	stripclose __P((struct tty *tp, int flags));
int	striptioctl __P((struct tty *tp, u_long cmd, caddr_t data,
			int flag, struct proc *p));
int	stripinput __P((int c, struct tty *tp));
int	stripstart __P((struct tty *tp));
#endif

#include "irframetty.h"
#if NIRFRAMETTY > 0
int	irframetopen __P((dev_t dev, struct tty *tp));
int	irframetclose __P((struct tty *tp, int flags));
int	irframetioctl __P((struct tty *tp, u_long cmd, caddr_t data,
			int flag, struct proc *p));
int	irframetinput __P((int c, struct tty *tp));
int	irframetstart __P((struct tty *tp));
int	irframetread __P((struct tty *tp, struct uio *uio, int flag));
int	irframetwrite __P((struct tty *tp, struct uio *uio, int flag));
int	irframetpoll __P((struct tty *tp, int events, struct proc *p));
#endif


struct  linesw termios_disc =
	{ "termios", TTYDISC, ttylopen, ttylclose, ttread, ttwrite,
	  ttynullioctl, ttyinput, ttstart, ttymodem, ttpoll };	/* 0- termios */
struct  linesw defunct_disc =
	{ "defunct", 1, ttynodisc, ttyerrclose, ttyerrio, ttyerrio,
	  ttynullioctl, ttyerrinput, ttyerrstart, nullmodem, ttyerrpoll }; /* 1- defunct */
#if defined(COMPAT_43) || defined(COMPAT_FREEBSD)
struct  linesw ntty_disc =
	{ "ntty", 2, ttylopen, ttylclose, ttread, ttwrite, ttynullioctl,
	  ttyinput, ttstart, ttymodem, ttpoll };	/* 2- old NTTYDISC */
#endif
#if NTB > 0
struct  linesw table_disc =
	{ "tablet", TABLDISC, tbopen, tbclose, tbread, ttyerrio, tbtioctl,
	  tbinput, ttstart, nullmodem, ttyerrpoll };	/* 3- TABLDISC */
#endif
#if NSL > 0
struct  linesw slip_disc =
	{ "slip", SLIPDISC, slopen, slclose, ttyerrio, ttyerrio, sltioctl,
	  slinput, slstart, nullmodem, ttyerrpoll };	/* 4- SLIPDISC */
#endif
#if NPPP > 0
struct  linesw ppp_disc =
	{ "ppp", PPPDISC, pppopen, pppclose, pppread, pppwrite, ppptioctl,
	  pppinput, pppstart, ttymodem, ttpoll };	/* 5- PPPDISC */
#endif
#if NSTRIP > 0
struct  linesw strip_disc =
	{ "strip", STRIPDISC, stripopen, stripclose, ttyerrio, ttyerrio,
	  striptioctl, stripinput, stripstart, nullmodem, ttyerrpoll };
							/* 6- STRIPDISC */
#endif
#if NIRFRAMETTY > 0
struct  linesw irframet_disc =
	{ "irframe", IRFRAMEDISC, irframetopen, irframetclose, ttyerrio,
	  ttyerrio, irframetioctl, irframetinput, irframetstart,
	  ttymodem, ttyerrpoll };			/* 10- IRFRAMEDISC */
#endif

/*
 * Registered line disciplines.  Don't use this
 * it will go away.
 */
#define LSWITCHBRK	20
struct	linesw **linesw = NULL;
int	nlinesw = 0;
int	slinesw = 0;

/*
 * Do nothing specific version of line
 * discipline specific ioctl command.
 */
/*ARGSUSED*/
int
ttynullioctl(tp, cmd, data, flags, p)
	struct tty *tp;
	u_long cmd;
	char *data;
	int flags;
	struct proc *p;
{

#ifdef lint
	tp = tp; data = data; flags = flags; p = p;
#endif
	return (EPASSTHROUGH);
}

/*
 * Register a line discipline, optionally providing a
 * specific discipline number for compatibility, -1 allocates
 * a new one.  Returns a discipline number, or -1 on
 * failure.
 */
int
ttyldisc_add(disc, no) 
	struct linesw *disc;
	int no;
{

	/* You are not allowed to exceed TTLINEDNAMELEN */
	if (strlen(disc->l_name) >= TTLINEDNAMELEN)
		return (-1);

	/* 
	 * You are not allowed to specify a line switch 
	 * compatibility number greater than 10.
	 */
	if (no > 10) 
		return (-1);

	if (linesw == NULL)
		panic("adding uninitialized linesw");

#ifdef DEBUG
	/*
	 * XXX: For the benefit of LKMs
	 */
	if (disc->l_poll == NULL)
		panic("line discipline must now provide l_poll() entry point");
#endif

	if (no == -1) {
		/* Hunt for any slot */

		for (no = slinesw; no-- > 0;)
			if (linesw[no] == NULL)
				break;
		/* if no == -1 we should realloc linesw, but for now... */
		if (no == -1)
			return (-1);
	}

	/* Need a specific slot */
	if (linesw[no] != NULL)
		return (-1);
	
	linesw[no] = disc;
	disc->l_no = no;

	/* Define size of table */
	if (no >= nlinesw)
		nlinesw = no + 1;
	
	return (no);
}

/*
 * Remove a line discipline by its name.  Returns the
 * discipline on success or NULL on failure.
 */
struct linesw *
ttyldisc_remove(name) 
	char *name;
{
	struct linesw *disc;
	int i;

	if (linesw == NULL)
		panic("removing uninitialized linesw");

	for (i = 0; i < nlinesw; i++) {
		if (linesw[i] && (strcmp(name, linesw[i]->l_name) == 0)) {
			disc = linesw[i];
			linesw[i] = NULL;
			
			if (nlinesw == i + 1) {
				/* Need to fix up array sizing */
				while (i-- > 0 && linesw[i] == NULL)
					continue;
				nlinesw = i + 1;
			}
			return (disc);
		}
	}
	return (NULL);
}

/*
 * Look up a line discipline by its name.
 */
struct linesw *
ttyldisc_lookup(name)
	char *name;
{
	int i;

	for (i = 0; i < nlinesw; i++)
		if (linesw[i] && (strcmp(name, linesw[i]->l_name) == 0))
			return (linesw[i]);
	return (NULL);
}

#define TTYLDISCINIT(s, v) \
	do { \
		if (ttyldisc_add(&(s), (v)) != (v)) \
			panic("ttyldisc_init: " __STRING(s)); \
	} while (/*CONSTCOND*/ 0)

/*
 * Register the basic line disciplines.
 */	
void
ttyldisc_init()
{

	/* Only initialize once */
	if (linesw)
		return;

	slinesw = LSWITCHBRK;
	linesw = malloc(slinesw * sizeof(struct linesw *), 
	    M_TTYS, M_WAITOK);
	memset(linesw, 0, slinesw * sizeof(struct linesw *));

	TTYLDISCINIT(termios_disc, 0);
	/* Do we really need this one? */
	TTYLDISCINIT(defunct_disc, 1);

	/* 
	 * The following should really be moved to
	 * initialization code for each module.
	 */

#if defined(COMPAT_43) || defined(COMPAT_FREEBSD)
	TTYLDISCINIT(ntty_disc, 2);
#endif
#if NTB > 0
	TTYLDISCINIT(table_disc, 3);
#endif
#if NSL > 0
	TTYLDISCINIT(slip_disc, 4);
#endif
#if NPPP > 0
	TTYLDISCINIT(ppp_disc, 5);
#endif
#if NSTRIP > 0
	TTYLDISCINIT(strip_disc, 6);
#endif
#if NIRFRAMETTY > 0
	ttyldisc_add(&irframet_disc, -1);
#endif
}