xref: /freebsd/sys/kern/subr_terminal.c (revision 076ad2f836d5f49dc1375f1677335a48fe0d4b82) 
1 /*-
2  * Copyright (c) 2009 The FreeBSD Foundation
3  * All rights reserved.
4  *
5  * This software was developed by Ed Schouten under sponsorship from the
6  * FreeBSD Foundation.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32 
33 #include <sys/param.h>
34 #include <sys/cons.h>
35 #include <sys/consio.h>
36 #include <sys/kernel.h>
37 #include <sys/lock.h>
38 #include <sys/malloc.h>
39 #include <sys/mutex.h>
40 #include <sys/systm.h>
41 #include <sys/terminal.h>
42 #include <sys/tty.h>
43 
44 #include <machine/stdarg.h>
45 
46 static MALLOC_DEFINE(M_TERMINAL, "terminal", "terminal device");
47 
48 /*
49  * Locking.
50  *
51  * Normally we don't need to lock down the terminal emulator, because
52  * the TTY lock is already held when calling teken_input().
53  * Unfortunately this is not the case when the terminal acts as a
54  * console device, because cnputc() can be called at the same time.
55  * This means terminals may need to be locked down using a spin lock.
56  */
57 #define	TERMINAL_LOCK(tm)	do {					\
58 	if ((tm)->tm_flags & TF_CONS)					\
59 		mtx_lock_spin(&(tm)->tm_mtx);				\
60 	else if ((tm)->tm_tty != NULL)					\
61 		tty_lock((tm)->tm_tty);					\
62 } while (0)
63 #define	TERMINAL_UNLOCK(tm)	do {					\
64 	if ((tm)->tm_flags & TF_CONS)					\
65 		mtx_unlock_spin(&(tm)->tm_mtx);				\
66 	else if ((tm)->tm_tty != NULL)					\
67 		tty_unlock((tm)->tm_tty);				\
68 } while (0)
69 #define	TERMINAL_LOCK_TTY(tm)	do {					\
70 	if ((tm)->tm_flags & TF_CONS)					\
71 		mtx_lock_spin(&(tm)->tm_mtx);				\
72 } while (0)
73 #define	TERMINAL_UNLOCK_TTY(tm)	do {					\
74 	if ((tm)->tm_flags & TF_CONS)					\
75 		mtx_unlock_spin(&(tm)->tm_mtx);				\
76 } while (0)
77 #define	TERMINAL_LOCK_CONS(tm)		mtx_lock_spin(&(tm)->tm_mtx)
78 #define	TERMINAL_UNLOCK_CONS(tm)	mtx_unlock_spin(&(tm)->tm_mtx)
79 
80 /*
81  * TTY routines.
82  */
83 
84 static tsw_open_t	termtty_open;
85 static tsw_close_t	termtty_close;
86 static tsw_outwakeup_t	termtty_outwakeup;
87 static tsw_ioctl_t	termtty_ioctl;
88 static tsw_mmap_t	termtty_mmap;
89 
90 static struct ttydevsw terminal_tty_class = {
91 	.tsw_open	= termtty_open,
92 	.tsw_close	= termtty_close,
93 	.tsw_outwakeup	= termtty_outwakeup,
94 	.tsw_ioctl	= termtty_ioctl,
95 	.tsw_mmap	= termtty_mmap,
96 };
97 
98 /*
99  * Terminal emulator routines.
100  */
101 
102 static tf_bell_t	termteken_bell;
103 static tf_cursor_t	termteken_cursor;
104 static tf_putchar_t	termteken_putchar;
105 static tf_fill_t	termteken_fill;
106 static tf_copy_t	termteken_copy;
107 static tf_param_t	termteken_param;
108 static tf_respond_t	termteken_respond;
109 
110 static teken_funcs_t terminal_drawmethods = {
111 	.tf_bell	= termteken_bell,
112 	.tf_cursor	= termteken_cursor,
113 	.tf_putchar	= termteken_putchar,
114 	.tf_fill	= termteken_fill,
115 	.tf_copy	= termteken_copy,
116 	.tf_param	= termteken_param,
117 	.tf_respond	= termteken_respond,
118 };
119 
120 /* Kernel message formatting. */
121 static const teken_attr_t kernel_message = {
122 	.ta_fgcolor	= TCHAR_FGCOLOR(TERMINAL_KERN_ATTR),
123 	.ta_bgcolor	= TCHAR_BGCOLOR(TERMINAL_KERN_ATTR),
124 	.ta_format	= TCHAR_FORMAT(TERMINAL_KERN_ATTR)
125 };
126 
127 static const teken_attr_t default_message = {
128 	.ta_fgcolor	= TCHAR_FGCOLOR(TERMINAL_NORM_ATTR),
129 	.ta_bgcolor	= TCHAR_BGCOLOR(TERMINAL_NORM_ATTR),
130 	.ta_format	= TCHAR_FORMAT(TERMINAL_NORM_ATTR)
131 };
132 
133 #define	TCHAR_CREATE(c, a)	((c) | TFORMAT((a)->ta_format) |	\
134 	TCOLOR_FG(teken_256to8((a)->ta_fgcolor)) |			\
135 	TCOLOR_BG(teken_256to8((a)->ta_bgcolor)))
136 
137 static void
138 terminal_init(struct terminal *tm)
139 {
140 
141 	if (tm->tm_flags & TF_CONS)
142 		mtx_init(&tm->tm_mtx, "trmlck", NULL, MTX_SPIN);
143 	teken_init(&tm->tm_emulator, &terminal_drawmethods, tm);
144 	teken_set_defattr(&tm->tm_emulator, &default_message);
145 }
146 
147 struct terminal *
148 terminal_alloc(const struct terminal_class *tc, void *softc)
149 {
150 	struct terminal *tm;
151 
152 	tm = malloc(sizeof(struct terminal), M_TERMINAL, M_WAITOK|M_ZERO);
153 	terminal_init(tm);
154 
155 	tm->tm_class = tc;
156 	tm->tm_softc = softc;
157 
158 	return (tm);
159 }
160 
161 static void
162 terminal_sync_ttysize(struct terminal *tm)
163 {
164 	struct tty *tp;
165 
166 	tp = tm->tm_tty;
167 	if (tp == NULL)
168 		return;
169 
170 	tty_lock(tp);
171 	tty_set_winsize(tp, &tm->tm_winsize);
172 	tty_unlock(tp);
173 }
174 
175 void
176 terminal_maketty(struct terminal *tm, const char *fmt, ...)
177 {
178 	struct tty *tp;
179 	char name[8];
180 	va_list ap;
181 
182 	va_start(ap, fmt);
183 	vsnrprintf(name, sizeof name, 32, fmt, ap);
184 	va_end(ap);
185 
186 	tp = tty_alloc(&terminal_tty_class, tm);
187 	tty_makedev(tp, NULL, "%s", name);
188 	tm->tm_tty = tp;
189 	terminal_sync_ttysize(tm);
190 }
191 
192 void
193 terminal_set_cursor(struct terminal *tm, const term_pos_t *pos)
194 {
195 
196 	teken_set_cursor(&tm->tm_emulator, pos);
197 }
198 
199 void
200 terminal_set_winsize_blank(struct terminal *tm, const struct winsize *size,
201     int blank, const term_attr_t *attr)
202 {
203 	term_rect_t r;
204 
205 	tm->tm_winsize = *size;
206 
207 	r.tr_begin.tp_row = r.tr_begin.tp_col = 0;
208 	r.tr_end.tp_row = size->ws_row;
209 	r.tr_end.tp_col = size->ws_col;
210 
211 	TERMINAL_LOCK(tm);
212 	if (blank == 0)
213 		teken_set_winsize_noreset(&tm->tm_emulator, &r.tr_end);
214 	else
215 		teken_set_winsize(&tm->tm_emulator, &r.tr_end);
216 	TERMINAL_UNLOCK(tm);
217 
218 	if ((blank != 0) && !(tm->tm_flags & TF_MUTE))
219 		tm->tm_class->tc_fill(tm, &r,
220 		    TCHAR_CREATE((teken_char_t)' ', attr));
221 
222 	terminal_sync_ttysize(tm);
223 }
224 
225 void
226 terminal_set_winsize(struct terminal *tm, const struct winsize *size)
227 {
228 
229 	terminal_set_winsize_blank(tm, size, 1,
230 	    (const term_attr_t *)&default_message);
231 }
232 
233 /*
234  * XXX: This function is a kludge.  Drivers like vt(4) need to
235  * temporarily stop input when resizing, etc.  This should ideally be
236  * handled within the driver.
237  */
238 
239 void
240 terminal_mute(struct terminal *tm, int yes)
241 {
242 
243 	TERMINAL_LOCK(tm);
244 	if (yes)
245 		tm->tm_flags |= TF_MUTE;
246 	else
247 		tm->tm_flags &= ~TF_MUTE;
248 	TERMINAL_UNLOCK(tm);
249 }
250 
251 void
252 terminal_input_char(struct terminal *tm, term_char_t c)
253 {
254 	struct tty *tp;
255 
256 	tp = tm->tm_tty;
257 	if (tp == NULL)
258 		return;
259 
260 	/*
261 	 * Strip off any attributes. Also ignore input of second part of
262 	 * CJK fullwidth characters, as we don't want to return these
263 	 * characters twice.
264 	 */
265 	if (TCHAR_FORMAT(c) & TF_CJK_RIGHT)
266 		return;
267 	c = TCHAR_CHARACTER(c);
268 
269 	tty_lock(tp);
270 	/*
271 	 * Conversion to UTF-8.
272 	 */
273 	if (c < 0x80) {
274 		ttydisc_rint(tp, c, 0);
275 	} else if (c < 0x800) {
276 		char str[2] = {
277 			0xc0 | (c >> 6),
278 			0x80 | (c & 0x3f)
279 		};
280 
281 		ttydisc_rint_simple(tp, str, sizeof str);
282 	} else if (c < 0x10000) {
283 		char str[3] = {
284 			0xe0 | (c >> 12),
285 			0x80 | ((c >> 6) & 0x3f),
286 			0x80 | (c & 0x3f)
287 		};
288 
289 		ttydisc_rint_simple(tp, str, sizeof str);
290 	} else {
291 		char str[4] = {
292 			0xf0 | (c >> 18),
293 			0x80 | ((c >> 12) & 0x3f),
294 			0x80 | ((c >> 6) & 0x3f),
295 			0x80 | (c & 0x3f)
296 		};
297 
298 		ttydisc_rint_simple(tp, str, sizeof str);
299 	}
300 	ttydisc_rint_done(tp);
301 	tty_unlock(tp);
302 }
303 
304 void
305 terminal_input_raw(struct terminal *tm, char c)
306 {
307 	struct tty *tp;
308 
309 	tp = tm->tm_tty;
310 	if (tp == NULL)
311 		return;
312 
313 	tty_lock(tp);
314 	ttydisc_rint(tp, c, 0);
315 	ttydisc_rint_done(tp);
316 	tty_unlock(tp);
317 }
318 
319 void
320 terminal_input_special(struct terminal *tm, unsigned int k)
321 {
322 	struct tty *tp;
323 	const char *str;
324 
325 	tp = tm->tm_tty;
326 	if (tp == NULL)
327 		return;
328 
329 	str = teken_get_sequence(&tm->tm_emulator, k);
330 	if (str == NULL)
331 		return;
332 
333 	tty_lock(tp);
334 	ttydisc_rint_simple(tp, str, strlen(str));
335 	ttydisc_rint_done(tp);
336 	tty_unlock(tp);
337 }
338 
339 /*
340  * Binding with the TTY layer.
341  */
342 
343 static int
344 termtty_open(struct tty *tp)
345 {
346 	struct terminal *tm = tty_softc(tp);
347 
348 	tm->tm_class->tc_opened(tm, 1);
349 	return (0);
350 }
351 
352 static void
353 termtty_close(struct tty *tp)
354 {
355 	struct terminal *tm = tty_softc(tp);
356 
357 	tm->tm_class->tc_opened(tm, 0);
358 }
359 
360 static void
361 termtty_outwakeup(struct tty *tp)
362 {
363 	struct terminal *tm = tty_softc(tp);
364 	char obuf[128];
365 	size_t olen;
366 	unsigned int flags = 0;
367 
368 	while ((olen = ttydisc_getc(tp, obuf, sizeof obuf)) > 0) {
369 		TERMINAL_LOCK_TTY(tm);
370 		if (!(tm->tm_flags & TF_MUTE)) {
371 			tm->tm_flags &= ~TF_BELL;
372 			teken_input(&tm->tm_emulator, obuf, olen);
373 			flags |= tm->tm_flags;
374 		}
375 		TERMINAL_UNLOCK_TTY(tm);
376 	}
377 
378 	TERMINAL_LOCK_TTY(tm);
379 	if (!(tm->tm_flags & TF_MUTE))
380 		tm->tm_class->tc_done(tm);
381 	TERMINAL_UNLOCK_TTY(tm);
382 	if (flags & TF_BELL)
383 		tm->tm_class->tc_bell(tm);
384 }
385 
386 static int
387 termtty_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
388 {
389 	struct terminal *tm = tty_softc(tp);
390 	int error;
391 
392 	switch (cmd) {
393 	case CONS_GETINFO: {
394 		vid_info_t *vi = (vid_info_t *)data;
395 		const teken_pos_t *p;
396 		int fg, bg;
397 
398 		if (vi->size != sizeof(vid_info_t))
399 			return (EINVAL);
400 
401 		/* Already help the console driver by filling in some data. */
402 		p = teken_get_cursor(&tm->tm_emulator);
403 		vi->mv_row = p->tp_row;
404 		vi->mv_col = p->tp_col;
405 
406 		p = teken_get_winsize(&tm->tm_emulator);
407 		vi->mv_rsz = p->tp_row;
408 		vi->mv_csz = p->tp_col;
409 
410 		teken_get_defattr_cons25(&tm->tm_emulator, &fg, &bg);
411 		vi->mv_norm.fore = fg;
412 		vi->mv_norm.back = bg;
413 		/* XXX: keep vidcontrol happy; bold backgrounds. */
414 		vi->mv_rev.fore = bg;
415 		vi->mv_rev.back = fg & 0x7;
416 		break;
417 	}
418 	}
419 
420 	/*
421 	 * Unlike various other drivers, this driver will never
422 	 * deallocate TTYs.  This means it's safe to temporarily unlock
423 	 * the TTY when handling ioctls.
424 	 */
425 	tty_unlock(tp);
426 	error = tm->tm_class->tc_ioctl(tm, cmd, data, td);
427 	tty_lock(tp);
428 	return (error);
429 }
430 
431 static int
432 termtty_mmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t * paddr,
433     int nprot, vm_memattr_t *memattr)
434 {
435 	struct terminal *tm = tty_softc(tp);
436 
437 	return (tm->tm_class->tc_mmap(tm, offset, paddr, nprot, memattr));
438 }
439 
440 /*
441  * Binding with the kernel and debug console.
442  */
443 
444 static cn_probe_t	termcn_cnprobe;
445 static cn_init_t	termcn_cninit;
446 static cn_term_t	termcn_cnterm;
447 static cn_getc_t	termcn_cngetc;
448 static cn_putc_t	termcn_cnputc;
449 static cn_grab_t	termcn_cngrab;
450 static cn_ungrab_t	termcn_cnungrab;
451 
452 const struct consdev_ops termcn_cnops = {
453 	.cn_probe	= termcn_cnprobe,
454 	.cn_init	= termcn_cninit,
455 	.cn_term	= termcn_cnterm,
456 	.cn_getc	= termcn_cngetc,
457 	.cn_putc	= termcn_cnputc,
458 	.cn_grab	= termcn_cngrab,
459 	.cn_ungrab	= termcn_cnungrab,
460 };
461 
462 void
463 termcn_cnregister(struct terminal *tm)
464 {
465 	struct consdev *cp;
466 
467 	cp = tm->consdev;
468 	if (cp == NULL) {
469 		cp = malloc(sizeof(struct consdev), M_TERMINAL,
470 		    M_WAITOK|M_ZERO);
471 		cp->cn_ops = &termcn_cnops;
472 		cp->cn_arg = tm;
473 		cp->cn_pri = CN_INTERNAL;
474 		sprintf(cp->cn_name, "ttyv0");
475 
476 		tm->tm_flags = TF_CONS;
477 		tm->consdev = cp;
478 
479 		terminal_init(tm);
480 	}
481 
482 	/* Attach terminal as console. */
483 	cnadd(cp);
484 }
485 
486 static void
487 termcn_cngrab(struct consdev *cp)
488 {
489 	struct terminal *tm = cp->cn_arg;
490 
491 	tm->tm_class->tc_cngrab(tm);
492 }
493 
494 static void
495 termcn_cnungrab(struct consdev *cp)
496 {
497 	struct terminal *tm = cp->cn_arg;
498 
499 	tm->tm_class->tc_cnungrab(tm);
500 }
501 
502 static void
503 termcn_cnprobe(struct consdev *cp)
504 {
505 	struct terminal *tm = cp->cn_arg;
506 
507 	if (tm == NULL) {
508 		cp->cn_pri = CN_DEAD;
509 		return;
510 	}
511 
512 	tm->consdev = cp;
513 	terminal_init(tm);
514 
515 	tm->tm_class->tc_cnprobe(tm, cp);
516 }
517 
518 static void
519 termcn_cninit(struct consdev *cp)
520 {
521 
522 }
523 
524 static void
525 termcn_cnterm(struct consdev *cp)
526 {
527 
528 }
529 
530 static int
531 termcn_cngetc(struct consdev *cp)
532 {
533 	struct terminal *tm = cp->cn_arg;
534 
535 	return (tm->tm_class->tc_cngetc(tm));
536 }
537 
538 static void
539 termcn_cnputc(struct consdev *cp, int c)
540 {
541 	struct terminal *tm = cp->cn_arg;
542 	teken_attr_t backup;
543 	char cv = c;
544 
545 	TERMINAL_LOCK_CONS(tm);
546 	if (!(tm->tm_flags & TF_MUTE)) {
547 		backup = *teken_get_curattr(&tm->tm_emulator);
548 		teken_set_curattr(&tm->tm_emulator, &kernel_message);
549 		teken_input(&tm->tm_emulator, &cv, 1);
550 		teken_set_curattr(&tm->tm_emulator, &backup);
551 		tm->tm_class->tc_done(tm);
552 	}
553 	TERMINAL_UNLOCK_CONS(tm);
554 }
555 
556 /*
557  * Binding with the terminal emulator.
558  */
559 
560 static void
561 termteken_bell(void *softc)
562 {
563 	struct terminal *tm = softc;
564 
565 	tm->tm_flags |= TF_BELL;
566 }
567 
568 static void
569 termteken_cursor(void *softc, const teken_pos_t *p)
570 {
571 	struct terminal *tm = softc;
572 
573 	tm->tm_class->tc_cursor(tm, p);
574 }
575 
576 static void
577 termteken_putchar(void *softc, const teken_pos_t *p, teken_char_t c,
578     const teken_attr_t *a)
579 {
580 	struct terminal *tm = softc;
581 
582 	tm->tm_class->tc_putchar(tm, p, TCHAR_CREATE(c, a));
583 }
584 
585 static void
586 termteken_fill(void *softc, const teken_rect_t *r, teken_char_t c,
587     const teken_attr_t *a)
588 {
589 	struct terminal *tm = softc;
590 
591 	tm->tm_class->tc_fill(tm, r, TCHAR_CREATE(c, a));
592 }
593 
594 static void
595 termteken_copy(void *softc, const teken_rect_t *r, const teken_pos_t *p)
596 {
597 	struct terminal *tm = softc;
598 
599 	tm->tm_class->tc_copy(tm, r, p);
600 }
601 
602 static void
603 termteken_param(void *softc, int cmd, unsigned int arg)
604 {
605 	struct terminal *tm = softc;
606 
607 	tm->tm_class->tc_param(tm, cmd, arg);
608 }
609 
610 static void
611 termteken_respond(void *softc, const void *buf, size_t len)
612 {
613 #if 0
614 	struct terminal *tm = softc;
615 	struct tty *tp;
616 
617 	/*
618 	 * Only inject a response into the TTY if the data actually
619 	 * originated from the TTY.
620 	 *
621 	 * XXX: This cannot be done right now.  The TTY could pick up
622 	 * other locks.  It could also in theory cause loops, when the
623 	 * TTY performs echoing of a command that generates even more
624 	 * input.
625 	 */
626 	tp = tm->tm_tty;
627 	if (tp == NULL)
628 		return;
629 
630 	ttydisc_rint_simple(tp, buf, len);
631 	ttydisc_rint_done(tp);
632 #endif
633 }
634