1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2009 The FreeBSD Foundation
5 *
6 * This software was developed by Ed Schouten under sponsorship from the
7 * FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/param.h>
32 #include <sys/cons.h>
33 #include <sys/consio.h>
34 #include <sys/kernel.h>
35 #include <sys/lock.h>
36 #include <sys/malloc.h>
37 #include <sys/mutex.h>
38 #include <sys/stdarg.h>
39 #include <sys/systm.h>
40 #include <sys/terminal.h>
41 #include <sys/tty.h>
42
43 static MALLOC_DEFINE(M_TERMINAL, "terminal", "terminal device");
44
45 /*
46 * Locking.
47 *
48 * Normally we don't need to lock down the terminal emulator, because
49 * the TTY lock is already held when calling teken_input().
50 * Unfortunately this is not the case when the terminal acts as a
51 * console device, because cnputc() can be called at the same time.
52 * This means terminals may need to be locked down using a spin lock.
53 */
54 #define TERMINAL_LOCK(tm) do { \
55 if ((tm)->tm_flags & TF_CONS) \
56 mtx_lock_spin(&(tm)->tm_mtx); \
57 else if ((tm)->tm_tty != NULL) \
58 tty_lock((tm)->tm_tty); \
59 } while (0)
60 #define TERMINAL_UNLOCK(tm) do { \
61 if ((tm)->tm_flags & TF_CONS) \
62 mtx_unlock_spin(&(tm)->tm_mtx); \
63 else if ((tm)->tm_tty != NULL) \
64 tty_unlock((tm)->tm_tty); \
65 } while (0)
66 #define TERMINAL_LOCK_TTY(tm) do { \
67 if ((tm)->tm_flags & TF_CONS) \
68 mtx_lock_spin(&(tm)->tm_mtx); \
69 } while (0)
70 #define TERMINAL_UNLOCK_TTY(tm) do { \
71 if ((tm)->tm_flags & TF_CONS) \
72 mtx_unlock_spin(&(tm)->tm_mtx); \
73 } while (0)
74 #define TERMINAL_LOCK_CONS(tm) mtx_lock_spin(&(tm)->tm_mtx)
75 #define TERMINAL_UNLOCK_CONS(tm) mtx_unlock_spin(&(tm)->tm_mtx)
76
77 /*
78 * TTY routines.
79 */
80
81 static tsw_open_t termtty_open;
82 static tsw_close_t termtty_close;
83 static tsw_outwakeup_t termtty_outwakeup;
84 static tsw_ioctl_t termtty_ioctl;
85 static tsw_mmap_t termtty_mmap;
86
87 static struct ttydevsw terminal_tty_class = {
88 .tsw_open = termtty_open,
89 .tsw_close = termtty_close,
90 .tsw_outwakeup = termtty_outwakeup,
91 .tsw_ioctl = termtty_ioctl,
92 .tsw_mmap = termtty_mmap,
93 };
94
95 /*
96 * Terminal emulator routines.
97 */
98
99 static tf_bell_t termteken_bell;
100 static tf_cursor_t termteken_cursor;
101 static tf_putchar_t termteken_putchar;
102 static tf_fill_t termteken_fill;
103 static tf_copy_t termteken_copy;
104 static tf_pre_input_t termteken_pre_input;
105 static tf_post_input_t termteken_post_input;
106 static tf_param_t termteken_param;
107 static tf_respond_t termteken_respond;
108
109 static teken_funcs_t terminal_drawmethods = {
110 .tf_bell = termteken_bell,
111 .tf_cursor = termteken_cursor,
112 .tf_putchar = termteken_putchar,
113 .tf_fill = termteken_fill,
114 .tf_copy = termteken_copy,
115 .tf_pre_input = termteken_pre_input,
116 .tf_post_input = termteken_post_input,
117 .tf_param = termteken_param,
118 .tf_respond = termteken_respond,
119 };
120
121 /* Kernel message formatting. */
122 static teken_attr_t kernel_message = {
123 .ta_fgcolor = TCHAR_FGCOLOR(TERMINAL_KERN_ATTR),
124 .ta_bgcolor = TCHAR_BGCOLOR(TERMINAL_KERN_ATTR),
125 .ta_format = TCHAR_FORMAT(TERMINAL_KERN_ATTR)
126 };
127
128 static teken_attr_t default_message = {
129 .ta_fgcolor = TCHAR_FGCOLOR(TERMINAL_NORM_ATTR),
130 .ta_bgcolor = TCHAR_BGCOLOR(TERMINAL_NORM_ATTR),
131 .ta_format = TCHAR_FORMAT(TERMINAL_NORM_ATTR)
132 };
133
134 /* Fudge fg brightness as TF_BOLD (shifted). */
135 #define TCOLOR_FG_FUDGED(color) __extension__ ({ \
136 teken_color_t _c; \
137 \
138 _c = (color); \
139 TCOLOR_FG(_c & 7) | ((_c & 8) << 18); \
140 })
141
142 /* Fudge bg brightness as TF_BLINK (shifted). */
143 #define TCOLOR_BG_FUDGED(color) __extension__ ({ \
144 teken_color_t _c; \
145 \
146 _c = (color); \
147 TCOLOR_BG(_c & 7) | ((_c & 8) << 20); \
148 })
149
150 #define TCOLOR_256TO16(color) __extension__ ({ \
151 teken_color_t _c; \
152 \
153 _c = (color); \
154 if (_c >= 16) \
155 _c = teken_256to16(_c); \
156 _c; \
157 })
158
159 #define TCHAR_CREATE(c, a) ((c) | TFORMAT((a)->ta_format) | \
160 TCOLOR_FG_FUDGED(TCOLOR_256TO16((a)->ta_fgcolor)) | \
161 TCOLOR_BG_FUDGED(TCOLOR_256TO16((a)->ta_bgcolor)))
162
163 static void
terminal_init(struct terminal * tm)164 terminal_init(struct terminal *tm)
165 {
166 int fg, bg;
167
168 if (tm->tm_flags & TF_CONS)
169 mtx_init(&tm->tm_mtx, "trmlck", NULL, MTX_SPIN);
170
171 teken_init(&tm->tm_emulator, &terminal_drawmethods, tm);
172
173 fg = bg = -1;
174 TUNABLE_INT_FETCH("teken.fg_color", &fg);
175 TUNABLE_INT_FETCH("teken.bg_color", &bg);
176
177 if (fg != -1) {
178 default_message.ta_fgcolor = fg;
179 kernel_message.ta_fgcolor = fg;
180 }
181 if (bg != -1) {
182 default_message.ta_bgcolor = bg;
183 kernel_message.ta_bgcolor = bg;
184 }
185
186 if (default_message.ta_bgcolor == TC_WHITE) {
187 default_message.ta_bgcolor |= TC_LIGHT;
188 kernel_message.ta_bgcolor |= TC_LIGHT;
189 }
190
191 if (default_message.ta_bgcolor == TC_BLACK &&
192 default_message.ta_fgcolor < TC_NCOLORS)
193 kernel_message.ta_fgcolor |= TC_LIGHT;
194 teken_set_defattr(&tm->tm_emulator, &default_message);
195 }
196
197 struct terminal *
terminal_alloc(const struct terminal_class * tc,void * softc)198 terminal_alloc(const struct terminal_class *tc, void *softc)
199 {
200 struct terminal *tm;
201
202 tm = malloc(sizeof(struct terminal), M_TERMINAL, M_WAITOK|M_ZERO);
203 terminal_init(tm);
204
205 tm->tm_class = tc;
206 tm->tm_softc = softc;
207
208 return (tm);
209 }
210
211 static void
terminal_sync_ttysize(struct terminal * tm)212 terminal_sync_ttysize(struct terminal *tm)
213 {
214 struct tty *tp;
215
216 tp = tm->tm_tty;
217 if (tp == NULL)
218 return;
219
220 tty_lock(tp);
221 tty_set_winsize(tp, &tm->tm_winsize);
222 tty_unlock(tp);
223 }
224
225 void
terminal_maketty(struct terminal * tm,const char * fmt,...)226 terminal_maketty(struct terminal *tm, const char *fmt, ...)
227 {
228 struct tty *tp;
229 char name[8];
230 va_list ap;
231
232 va_start(ap, fmt);
233 vsnrprintf(name, sizeof name, 32, fmt, ap);
234 va_end(ap);
235
236 tp = tty_alloc(&terminal_tty_class, tm);
237 tty_makedev(tp, NULL, "%s", name);
238 tm->tm_tty = tp;
239 terminal_sync_ttysize(tm);
240 }
241
242 void
terminal_set_cursor(struct terminal * tm,const term_pos_t * pos)243 terminal_set_cursor(struct terminal *tm, const term_pos_t *pos)
244 {
245
246 teken_set_cursor(&tm->tm_emulator, pos);
247 }
248
249 void
terminal_set_winsize_blank(struct terminal * tm,const struct winsize * size,int blank,const term_attr_t * attr)250 terminal_set_winsize_blank(struct terminal *tm, const struct winsize *size,
251 int blank, const term_attr_t *attr)
252 {
253 term_rect_t r;
254
255 tm->tm_winsize = *size;
256
257 r.tr_begin.tp_row = r.tr_begin.tp_col = 0;
258 r.tr_end.tp_row = size->ws_row;
259 r.tr_end.tp_col = size->ws_col;
260
261 TERMINAL_LOCK(tm);
262 if (blank == 0)
263 teken_set_winsize_noreset(&tm->tm_emulator, &r.tr_end);
264 else
265 teken_set_winsize(&tm->tm_emulator, &r.tr_end);
266 TERMINAL_UNLOCK(tm);
267
268 if ((blank != 0) && !(tm->tm_flags & TF_MUTE))
269 tm->tm_class->tc_fill(tm, &r,
270 TCHAR_CREATE((teken_char_t)' ', attr));
271
272 terminal_sync_ttysize(tm);
273 }
274
275 void
terminal_set_winsize(struct terminal * tm,const struct winsize * size)276 terminal_set_winsize(struct terminal *tm, const struct winsize *size)
277 {
278
279 terminal_set_winsize_blank(tm, size, 1,
280 (const term_attr_t *)&default_message);
281 }
282
283 /*
284 * XXX: This function is a kludge. Drivers like vt(4) need to
285 * temporarily stop input when resizing, etc. This should ideally be
286 * handled within the driver.
287 */
288
289 void
terminal_mute(struct terminal * tm,int yes)290 terminal_mute(struct terminal *tm, int yes)
291 {
292
293 TERMINAL_LOCK(tm);
294 if (yes)
295 tm->tm_flags |= TF_MUTE;
296 else
297 tm->tm_flags &= ~TF_MUTE;
298 TERMINAL_UNLOCK(tm);
299 }
300
301 void
terminal_input_char(struct terminal * tm,term_char_t c)302 terminal_input_char(struct terminal *tm, term_char_t c)
303 {
304 struct tty *tp;
305
306 tp = tm->tm_tty;
307 if (tp == NULL)
308 return;
309
310 /*
311 * Strip off any attributes. Also ignore input of second part of
312 * CJK fullwidth characters, as we don't want to return these
313 * characters twice.
314 */
315 if (TCHAR_FORMAT(c) & TF_CJK_RIGHT)
316 return;
317 c = TCHAR_CHARACTER(c);
318
319 tty_lock(tp);
320 /*
321 * Conversion to UTF-8.
322 */
323 if (c < 0x80) {
324 ttydisc_rint(tp, c, 0);
325 } else if (c < 0x800) {
326 char str[2] = {
327 0xc0 | (c >> 6),
328 0x80 | (c & 0x3f)
329 };
330
331 ttydisc_rint_simple(tp, str, sizeof str);
332 } else if (c < 0x10000) {
333 char str[3] = {
334 0xe0 | (c >> 12),
335 0x80 | ((c >> 6) & 0x3f),
336 0x80 | (c & 0x3f)
337 };
338
339 ttydisc_rint_simple(tp, str, sizeof str);
340 } else {
341 char str[4] = {
342 0xf0 | (c >> 18),
343 0x80 | ((c >> 12) & 0x3f),
344 0x80 | ((c >> 6) & 0x3f),
345 0x80 | (c & 0x3f)
346 };
347
348 ttydisc_rint_simple(tp, str, sizeof str);
349 }
350 ttydisc_rint_done(tp);
351 tty_unlock(tp);
352 }
353
354 void
terminal_input_raw(struct terminal * tm,char c)355 terminal_input_raw(struct terminal *tm, char c)
356 {
357 struct tty *tp;
358
359 tp = tm->tm_tty;
360 if (tp == NULL)
361 return;
362
363 tty_lock(tp);
364 ttydisc_rint(tp, c, 0);
365 ttydisc_rint_done(tp);
366 tty_unlock(tp);
367 }
368
369 void
terminal_input_special(struct terminal * tm,unsigned int k)370 terminal_input_special(struct terminal *tm, unsigned int k)
371 {
372 struct tty *tp;
373 const char *str;
374
375 tp = tm->tm_tty;
376 if (tp == NULL)
377 return;
378
379 str = teken_get_sequence(&tm->tm_emulator, k);
380 if (str == NULL)
381 return;
382
383 tty_lock(tp);
384 ttydisc_rint_simple(tp, str, strlen(str));
385 ttydisc_rint_done(tp);
386 tty_unlock(tp);
387 }
388
389 /*
390 * Binding with the TTY layer.
391 */
392
393 static int
termtty_open(struct tty * tp)394 termtty_open(struct tty *tp)
395 {
396 struct terminal *tm = tty_softc(tp);
397
398 tm->tm_class->tc_opened(tm, 1);
399 return (0);
400 }
401
402 static void
termtty_close(struct tty * tp)403 termtty_close(struct tty *tp)
404 {
405 struct terminal *tm = tty_softc(tp);
406
407 tm->tm_class->tc_opened(tm, 0);
408 }
409
410 static void
termtty_outwakeup(struct tty * tp)411 termtty_outwakeup(struct tty *tp)
412 {
413 struct terminal *tm = tty_softc(tp);
414 char obuf[128];
415 size_t olen;
416 unsigned int flags = 0;
417
418 while ((olen = ttydisc_getc(tp, obuf, sizeof obuf)) > 0) {
419 TERMINAL_LOCK_TTY(tm);
420 if (!(tm->tm_flags & TF_MUTE)) {
421 tm->tm_flags &= ~TF_BELL;
422 teken_input(&tm->tm_emulator, obuf, olen);
423 flags |= tm->tm_flags;
424 }
425 TERMINAL_UNLOCK_TTY(tm);
426 }
427
428 TERMINAL_LOCK_TTY(tm);
429 if (!(tm->tm_flags & TF_MUTE))
430 tm->tm_class->tc_done(tm);
431 TERMINAL_UNLOCK_TTY(tm);
432 if (flags & TF_BELL)
433 tm->tm_class->tc_bell(tm);
434 }
435
436 static int
termtty_ioctl(struct tty * tp,u_long cmd,caddr_t data,struct thread * td)437 termtty_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
438 {
439 struct terminal *tm = tty_softc(tp);
440 int error;
441
442 switch (cmd) {
443 case CONS_GETINFO: {
444 vid_info_t *vi = (vid_info_t *)data;
445 const teken_pos_t *p;
446 int fg, bg;
447
448 if (vi->size != sizeof(vid_info_t))
449 return (EINVAL);
450
451 /* Already help the console driver by filling in some data. */
452 p = teken_get_cursor(&tm->tm_emulator);
453 vi->mv_row = p->tp_row;
454 vi->mv_col = p->tp_col;
455
456 p = teken_get_winsize(&tm->tm_emulator);
457 vi->mv_rsz = p->tp_row;
458 vi->mv_csz = p->tp_col;
459
460 teken_get_defattr_cons25(&tm->tm_emulator, &fg, &bg);
461 vi->mv_norm.fore = fg;
462 vi->mv_norm.back = bg;
463 /* XXX: keep vidcontrol happy; bold backgrounds. */
464 vi->mv_rev.fore = bg;
465 vi->mv_rev.back = fg & 0x7;
466 break;
467 }
468 }
469
470 /*
471 * Unlike various other drivers, this driver will never
472 * deallocate TTYs. This means it's safe to temporarily unlock
473 * the TTY when handling ioctls.
474 */
475 tty_unlock(tp);
476 error = tm->tm_class->tc_ioctl(tm, cmd, data, td);
477 tty_lock(tp);
478 if ((error == 0) && (cmd == CONS_CLRHIST)) {
479 /*
480 * Scrollback history has been successfully cleared,
481 * so reset the cursor position to the top left of the screen.
482 */
483 teken_pos_t p;
484 p.tp_row = 0;
485 p.tp_col = 0;
486 teken_set_cursor(&tm->tm_emulator, &p);
487 }
488 return (error);
489 }
490
491 static int
termtty_mmap(struct tty * tp,vm_ooffset_t offset,vm_paddr_t * paddr,int nprot,vm_memattr_t * memattr)492 termtty_mmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t * paddr,
493 int nprot, vm_memattr_t *memattr)
494 {
495 struct terminal *tm = tty_softc(tp);
496
497 return (tm->tm_class->tc_mmap(tm, offset, paddr, nprot, memattr));
498 }
499
500 /*
501 * Binding with the kernel and debug console.
502 */
503
504 static cn_probe_t termcn_cnprobe;
505 static cn_init_t termcn_cninit;
506 static cn_term_t termcn_cnterm;
507 static cn_getc_t termcn_cngetc;
508 static cn_putc_t termcn_cnputc;
509 static cn_grab_t termcn_cngrab;
510 static cn_ungrab_t termcn_cnungrab;
511
512 const struct consdev_ops termcn_cnops = {
513 .cn_probe = termcn_cnprobe,
514 .cn_init = termcn_cninit,
515 .cn_term = termcn_cnterm,
516 .cn_getc = termcn_cngetc,
517 .cn_putc = termcn_cnputc,
518 .cn_grab = termcn_cngrab,
519 .cn_ungrab = termcn_cnungrab,
520 };
521
522 void
termcn_cnregister(struct terminal * tm)523 termcn_cnregister(struct terminal *tm)
524 {
525 struct consdev *cp;
526
527 cp = tm->consdev;
528 if (cp == NULL) {
529 cp = malloc(sizeof(struct consdev), M_TERMINAL,
530 M_WAITOK|M_ZERO);
531 cp->cn_ops = &termcn_cnops;
532 cp->cn_arg = tm;
533 cp->cn_pri = CN_INTERNAL;
534 sprintf(cp->cn_name, "ttyv0");
535
536 tm->tm_flags = TF_CONS;
537 tm->consdev = cp;
538
539 terminal_init(tm);
540 }
541
542 /* Attach terminal as console. */
543 cnadd(cp);
544 }
545
546 static void
termcn_cngrab(struct consdev * cp)547 termcn_cngrab(struct consdev *cp)
548 {
549 struct terminal *tm = cp->cn_arg;
550
551 tm->tm_class->tc_cngrab(tm);
552 }
553
554 static void
termcn_cnungrab(struct consdev * cp)555 termcn_cnungrab(struct consdev *cp)
556 {
557 struct terminal *tm = cp->cn_arg;
558
559 tm->tm_class->tc_cnungrab(tm);
560 }
561
562 static void
termcn_cnprobe(struct consdev * cp)563 termcn_cnprobe(struct consdev *cp)
564 {
565 struct terminal *tm = cp->cn_arg;
566
567 if (tm == NULL) {
568 cp->cn_pri = CN_DEAD;
569 return;
570 }
571
572 tm->consdev = cp;
573 terminal_init(tm);
574
575 tm->tm_class->tc_cnprobe(tm, cp);
576 }
577
578 static void
termcn_cninit(struct consdev * cp)579 termcn_cninit(struct consdev *cp)
580 {
581
582 }
583
584 static void
termcn_cnterm(struct consdev * cp)585 termcn_cnterm(struct consdev *cp)
586 {
587
588 }
589
590 static int
termcn_cngetc(struct consdev * cp)591 termcn_cngetc(struct consdev *cp)
592 {
593 struct terminal *tm = cp->cn_arg;
594
595 return (tm->tm_class->tc_cngetc(tm));
596 }
597
598 static void
termcn_cnputc(struct consdev * cp,int c)599 termcn_cnputc(struct consdev *cp, int c)
600 {
601 struct terminal *tm = cp->cn_arg;
602 teken_attr_t backup;
603 char cv = c;
604
605 TERMINAL_LOCK_CONS(tm);
606 if (!(tm->tm_flags & TF_MUTE)) {
607 backup = *teken_get_curattr(&tm->tm_emulator);
608 teken_set_curattr(&tm->tm_emulator, &kernel_message);
609 teken_input(&tm->tm_emulator, &cv, 1);
610 teken_set_curattr(&tm->tm_emulator, &backup);
611 tm->tm_class->tc_done(tm);
612 }
613 TERMINAL_UNLOCK_CONS(tm);
614 }
615
616 /*
617 * Binding with the terminal emulator.
618 */
619
620 static void
termteken_bell(void * softc)621 termteken_bell(void *softc)
622 {
623 struct terminal *tm = softc;
624
625 tm->tm_flags |= TF_BELL;
626 }
627
628 static void
termteken_cursor(void * softc,const teken_pos_t * p)629 termteken_cursor(void *softc, const teken_pos_t *p)
630 {
631 struct terminal *tm = softc;
632
633 tm->tm_class->tc_cursor(tm, p);
634 }
635
636 static void
termteken_putchar(void * softc,const teken_pos_t * p,teken_char_t c,const teken_attr_t * a)637 termteken_putchar(void *softc, const teken_pos_t *p, teken_char_t c,
638 const teken_attr_t *a)
639 {
640 struct terminal *tm = softc;
641
642 tm->tm_class->tc_putchar(tm, p, TCHAR_CREATE(c, a));
643 }
644
645 static void
termteken_fill(void * softc,const teken_rect_t * r,teken_char_t c,const teken_attr_t * a)646 termteken_fill(void *softc, const teken_rect_t *r, teken_char_t c,
647 const teken_attr_t *a)
648 {
649 struct terminal *tm = softc;
650
651 tm->tm_class->tc_fill(tm, r, TCHAR_CREATE(c, a));
652 }
653
654 static void
termteken_copy(void * softc,const teken_rect_t * r,const teken_pos_t * p)655 termteken_copy(void *softc, const teken_rect_t *r, const teken_pos_t *p)
656 {
657 struct terminal *tm = softc;
658
659 tm->tm_class->tc_copy(tm, r, p);
660 }
661
662 static void
termteken_pre_input(void * softc)663 termteken_pre_input(void *softc)
664 {
665 struct terminal *tm = softc;
666
667 tm->tm_class->tc_pre_input(tm);
668 }
669
670 static void
termteken_post_input(void * softc)671 termteken_post_input(void *softc)
672 {
673 struct terminal *tm = softc;
674
675 tm->tm_class->tc_post_input(tm);
676 }
677
678 static void
termteken_param(void * softc,int cmd,unsigned int arg)679 termteken_param(void *softc, int cmd, unsigned int arg)
680 {
681 struct terminal *tm = softc;
682
683 tm->tm_class->tc_param(tm, cmd, arg);
684 }
685
686 static void
termteken_respond(void * softc,const void * buf,size_t len)687 termteken_respond(void *softc, const void *buf, size_t len)
688 {
689 #if 0
690 struct terminal *tm = softc;
691 struct tty *tp;
692
693 /*
694 * Only inject a response into the TTY if the data actually
695 * originated from the TTY.
696 *
697 * XXX: This cannot be done right now. The TTY could pick up
698 * other locks. It could also in theory cause loops, when the
699 * TTY performs echoing of a command that generates even more
700 * input.
701 */
702 tp = tm->tm_tty;
703 if (tp == NULL)
704 return;
705
706 ttydisc_rint_simple(tp, buf, len);
707 ttydisc_rint_done(tp);
708 #endif
709 }
710