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/systm.h>
39 #include <sys/terminal.h>
40 #include <sys/tty.h>
41
42 #include <machine/stdarg.h>
43
44 static MALLOC_DEFINE(M_TERMINAL, "terminal", "terminal device");
45
46 /*
47 * Locking.
48 *
49 * Normally we don't need to lock down the terminal emulator, because
50 * the TTY lock is already held when calling teken_input().
51 * Unfortunately this is not the case when the terminal acts as a
52 * console device, because cnputc() can be called at the same time.
53 * This means terminals may need to be locked down using a spin lock.
54 */
55 #define TERMINAL_LOCK(tm) do { \
56 if ((tm)->tm_flags & TF_CONS) \
57 mtx_lock_spin(&(tm)->tm_mtx); \
58 else if ((tm)->tm_tty != NULL) \
59 tty_lock((tm)->tm_tty); \
60 } while (0)
61 #define TERMINAL_UNLOCK(tm) do { \
62 if ((tm)->tm_flags & TF_CONS) \
63 mtx_unlock_spin(&(tm)->tm_mtx); \
64 else if ((tm)->tm_tty != NULL) \
65 tty_unlock((tm)->tm_tty); \
66 } while (0)
67 #define TERMINAL_LOCK_TTY(tm) do { \
68 if ((tm)->tm_flags & TF_CONS) \
69 mtx_lock_spin(&(tm)->tm_mtx); \
70 } while (0)
71 #define TERMINAL_UNLOCK_TTY(tm) do { \
72 if ((tm)->tm_flags & TF_CONS) \
73 mtx_unlock_spin(&(tm)->tm_mtx); \
74 } while (0)
75 #define TERMINAL_LOCK_CONS(tm) mtx_lock_spin(&(tm)->tm_mtx)
76 #define TERMINAL_UNLOCK_CONS(tm) mtx_unlock_spin(&(tm)->tm_mtx)
77
78 /*
79 * TTY routines.
80 */
81
82 static tsw_open_t termtty_open;
83 static tsw_close_t termtty_close;
84 static tsw_outwakeup_t termtty_outwakeup;
85 static tsw_ioctl_t termtty_ioctl;
86 static tsw_mmap_t termtty_mmap;
87
88 static struct ttydevsw terminal_tty_class = {
89 .tsw_open = termtty_open,
90 .tsw_close = termtty_close,
91 .tsw_outwakeup = termtty_outwakeup,
92 .tsw_ioctl = termtty_ioctl,
93 .tsw_mmap = termtty_mmap,
94 };
95
96 /*
97 * Terminal emulator routines.
98 */
99
100 static tf_bell_t termteken_bell;
101 static tf_cursor_t termteken_cursor;
102 static tf_putchar_t termteken_putchar;
103 static tf_fill_t termteken_fill;
104 static tf_copy_t termteken_copy;
105 static tf_pre_input_t termteken_pre_input;
106 static tf_post_input_t termteken_post_input;
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_pre_input = termteken_pre_input,
117 .tf_post_input = termteken_post_input,
118 .tf_param = termteken_param,
119 .tf_respond = termteken_respond,
120 };
121
122 /* Kernel message formatting. */
123 static teken_attr_t kernel_message = {
124 .ta_fgcolor = TCHAR_FGCOLOR(TERMINAL_KERN_ATTR),
125 .ta_bgcolor = TCHAR_BGCOLOR(TERMINAL_KERN_ATTR),
126 .ta_format = TCHAR_FORMAT(TERMINAL_KERN_ATTR)
127 };
128
129 static teken_attr_t default_message = {
130 .ta_fgcolor = TCHAR_FGCOLOR(TERMINAL_NORM_ATTR),
131 .ta_bgcolor = TCHAR_BGCOLOR(TERMINAL_NORM_ATTR),
132 .ta_format = TCHAR_FORMAT(TERMINAL_NORM_ATTR)
133 };
134
135 /* Fudge fg brightness as TF_BOLD (shifted). */
136 #define TCOLOR_FG_FUDGED(color) __extension__ ({ \
137 teken_color_t _c; \
138 \
139 _c = (color); \
140 TCOLOR_FG(_c & 7) | ((_c & 8) << 18); \
141 })
142
143 /* Fudge bg brightness as TF_BLINK (shifted). */
144 #define TCOLOR_BG_FUDGED(color) __extension__ ({ \
145 teken_color_t _c; \
146 \
147 _c = (color); \
148 TCOLOR_BG(_c & 7) | ((_c & 8) << 20); \
149 })
150
151 #define TCOLOR_256TO16(color) __extension__ ({ \
152 teken_color_t _c; \
153 \
154 _c = (color); \
155 if (_c >= 16) \
156 _c = teken_256to16(_c); \
157 _c; \
158 })
159
160 #define TCHAR_CREATE(c, a) ((c) | TFORMAT((a)->ta_format) | \
161 TCOLOR_FG_FUDGED(TCOLOR_256TO16((a)->ta_fgcolor)) | \
162 TCOLOR_BG_FUDGED(TCOLOR_256TO16((a)->ta_bgcolor)))
163
164 static void
terminal_init(struct terminal * tm)165 terminal_init(struct terminal *tm)
166 {
167 int fg, bg;
168
169 if (tm->tm_flags & TF_CONS)
170 mtx_init(&tm->tm_mtx, "trmlck", NULL, MTX_SPIN);
171
172 teken_init(&tm->tm_emulator, &terminal_drawmethods, tm);
173
174 fg = bg = -1;
175 TUNABLE_INT_FETCH("teken.fg_color", &fg);
176 TUNABLE_INT_FETCH("teken.bg_color", &bg);
177
178 if (fg != -1) {
179 default_message.ta_fgcolor = fg;
180 kernel_message.ta_fgcolor = fg;
181 }
182 if (bg != -1) {
183 default_message.ta_bgcolor = bg;
184 kernel_message.ta_bgcolor = bg;
185 }
186
187 if (default_message.ta_bgcolor == TC_WHITE) {
188 default_message.ta_bgcolor |= TC_LIGHT;
189 kernel_message.ta_bgcolor |= TC_LIGHT;
190 }
191
192 if (default_message.ta_bgcolor == TC_BLACK &&
193 default_message.ta_fgcolor < TC_NCOLORS)
194 kernel_message.ta_fgcolor |= TC_LIGHT;
195 teken_set_defattr(&tm->tm_emulator, &default_message);
196 }
197
198 struct terminal *
terminal_alloc(const struct terminal_class * tc,void * softc)199 terminal_alloc(const struct terminal_class *tc, void *softc)
200 {
201 struct terminal *tm;
202
203 tm = malloc(sizeof(struct terminal), M_TERMINAL, M_WAITOK|M_ZERO);
204 terminal_init(tm);
205
206 tm->tm_class = tc;
207 tm->tm_softc = softc;
208
209 return (tm);
210 }
211
212 static void
terminal_sync_ttysize(struct terminal * tm)213 terminal_sync_ttysize(struct terminal *tm)
214 {
215 struct tty *tp;
216
217 tp = tm->tm_tty;
218 if (tp == NULL)
219 return;
220
221 tty_lock(tp);
222 tty_set_winsize(tp, &tm->tm_winsize);
223 tty_unlock(tp);
224 }
225
226 void
terminal_maketty(struct terminal * tm,const char * fmt,...)227 terminal_maketty(struct terminal *tm, const char *fmt, ...)
228 {
229 struct tty *tp;
230 char name[8];
231 va_list ap;
232
233 va_start(ap, fmt);
234 vsnrprintf(name, sizeof name, 32, fmt, ap);
235 va_end(ap);
236
237 tp = tty_alloc(&terminal_tty_class, tm);
238 tty_makedev(tp, NULL, "%s", name);
239 tm->tm_tty = tp;
240 terminal_sync_ttysize(tm);
241 }
242
243 void
terminal_set_cursor(struct terminal * tm,const term_pos_t * pos)244 terminal_set_cursor(struct terminal *tm, const term_pos_t *pos)
245 {
246
247 teken_set_cursor(&tm->tm_emulator, pos);
248 }
249
250 void
terminal_set_winsize_blank(struct terminal * tm,const struct winsize * size,int blank,const term_attr_t * attr)251 terminal_set_winsize_blank(struct terminal *tm, const struct winsize *size,
252 int blank, const term_attr_t *attr)
253 {
254 term_rect_t r;
255
256 tm->tm_winsize = *size;
257
258 r.tr_begin.tp_row = r.tr_begin.tp_col = 0;
259 r.tr_end.tp_row = size->ws_row;
260 r.tr_end.tp_col = size->ws_col;
261
262 TERMINAL_LOCK(tm);
263 if (blank == 0)
264 teken_set_winsize_noreset(&tm->tm_emulator, &r.tr_end);
265 else
266 teken_set_winsize(&tm->tm_emulator, &r.tr_end);
267 TERMINAL_UNLOCK(tm);
268
269 if ((blank != 0) && !(tm->tm_flags & TF_MUTE))
270 tm->tm_class->tc_fill(tm, &r,
271 TCHAR_CREATE((teken_char_t)' ', attr));
272
273 terminal_sync_ttysize(tm);
274 }
275
276 void
terminal_set_winsize(struct terminal * tm,const struct winsize * size)277 terminal_set_winsize(struct terminal *tm, const struct winsize *size)
278 {
279
280 terminal_set_winsize_blank(tm, size, 1,
281 (const term_attr_t *)&default_message);
282 }
283
284 /*
285 * XXX: This function is a kludge. Drivers like vt(4) need to
286 * temporarily stop input when resizing, etc. This should ideally be
287 * handled within the driver.
288 */
289
290 void
terminal_mute(struct terminal * tm,int yes)291 terminal_mute(struct terminal *tm, int yes)
292 {
293
294 TERMINAL_LOCK(tm);
295 if (yes)
296 tm->tm_flags |= TF_MUTE;
297 else
298 tm->tm_flags &= ~TF_MUTE;
299 TERMINAL_UNLOCK(tm);
300 }
301
302 void
terminal_input_char(struct terminal * tm,term_char_t c)303 terminal_input_char(struct terminal *tm, term_char_t c)
304 {
305 struct tty *tp;
306
307 tp = tm->tm_tty;
308 if (tp == NULL)
309 return;
310
311 /*
312 * Strip off any attributes. Also ignore input of second part of
313 * CJK fullwidth characters, as we don't want to return these
314 * characters twice.
315 */
316 if (TCHAR_FORMAT(c) & TF_CJK_RIGHT)
317 return;
318 c = TCHAR_CHARACTER(c);
319
320 tty_lock(tp);
321 /*
322 * Conversion to UTF-8.
323 */
324 if (c < 0x80) {
325 ttydisc_rint(tp, c, 0);
326 } else if (c < 0x800) {
327 char str[2] = {
328 0xc0 | (c >> 6),
329 0x80 | (c & 0x3f)
330 };
331
332 ttydisc_rint_simple(tp, str, sizeof str);
333 } else if (c < 0x10000) {
334 char str[3] = {
335 0xe0 | (c >> 12),
336 0x80 | ((c >> 6) & 0x3f),
337 0x80 | (c & 0x3f)
338 };
339
340 ttydisc_rint_simple(tp, str, sizeof str);
341 } else {
342 char str[4] = {
343 0xf0 | (c >> 18),
344 0x80 | ((c >> 12) & 0x3f),
345 0x80 | ((c >> 6) & 0x3f),
346 0x80 | (c & 0x3f)
347 };
348
349 ttydisc_rint_simple(tp, str, sizeof str);
350 }
351 ttydisc_rint_done(tp);
352 tty_unlock(tp);
353 }
354
355 void
terminal_input_raw(struct terminal * tm,char c)356 terminal_input_raw(struct terminal *tm, char c)
357 {
358 struct tty *tp;
359
360 tp = tm->tm_tty;
361 if (tp == NULL)
362 return;
363
364 tty_lock(tp);
365 ttydisc_rint(tp, c, 0);
366 ttydisc_rint_done(tp);
367 tty_unlock(tp);
368 }
369
370 void
terminal_input_special(struct terminal * tm,unsigned int k)371 terminal_input_special(struct terminal *tm, unsigned int k)
372 {
373 struct tty *tp;
374 const char *str;
375
376 tp = tm->tm_tty;
377 if (tp == NULL)
378 return;
379
380 str = teken_get_sequence(&tm->tm_emulator, k);
381 if (str == NULL)
382 return;
383
384 tty_lock(tp);
385 ttydisc_rint_simple(tp, str, strlen(str));
386 ttydisc_rint_done(tp);
387 tty_unlock(tp);
388 }
389
390 /*
391 * Binding with the TTY layer.
392 */
393
394 static int
termtty_open(struct tty * tp)395 termtty_open(struct tty *tp)
396 {
397 struct terminal *tm = tty_softc(tp);
398
399 tm->tm_class->tc_opened(tm, 1);
400 return (0);
401 }
402
403 static void
termtty_close(struct tty * tp)404 termtty_close(struct tty *tp)
405 {
406 struct terminal *tm = tty_softc(tp);
407
408 tm->tm_class->tc_opened(tm, 0);
409 }
410
411 static void
termtty_outwakeup(struct tty * tp)412 termtty_outwakeup(struct tty *tp)
413 {
414 struct terminal *tm = tty_softc(tp);
415 char obuf[128];
416 size_t olen;
417 unsigned int flags = 0;
418
419 while ((olen = ttydisc_getc(tp, obuf, sizeof obuf)) > 0) {
420 TERMINAL_LOCK_TTY(tm);
421 if (!(tm->tm_flags & TF_MUTE)) {
422 tm->tm_flags &= ~TF_BELL;
423 teken_input(&tm->tm_emulator, obuf, olen);
424 flags |= tm->tm_flags;
425 }
426 TERMINAL_UNLOCK_TTY(tm);
427 }
428
429 TERMINAL_LOCK_TTY(tm);
430 if (!(tm->tm_flags & TF_MUTE))
431 tm->tm_class->tc_done(tm);
432 TERMINAL_UNLOCK_TTY(tm);
433 if (flags & TF_BELL)
434 tm->tm_class->tc_bell(tm);
435 }
436
437 static int
termtty_ioctl(struct tty * tp,u_long cmd,caddr_t data,struct thread * td)438 termtty_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
439 {
440 struct terminal *tm = tty_softc(tp);
441 int error;
442
443 switch (cmd) {
444 case CONS_GETINFO: {
445 vid_info_t *vi = (vid_info_t *)data;
446 const teken_pos_t *p;
447 int fg, bg;
448
449 if (vi->size != sizeof(vid_info_t))
450 return (EINVAL);
451
452 /* Already help the console driver by filling in some data. */
453 p = teken_get_cursor(&tm->tm_emulator);
454 vi->mv_row = p->tp_row;
455 vi->mv_col = p->tp_col;
456
457 p = teken_get_winsize(&tm->tm_emulator);
458 vi->mv_rsz = p->tp_row;
459 vi->mv_csz = p->tp_col;
460
461 teken_get_defattr_cons25(&tm->tm_emulator, &fg, &bg);
462 vi->mv_norm.fore = fg;
463 vi->mv_norm.back = bg;
464 /* XXX: keep vidcontrol happy; bold backgrounds. */
465 vi->mv_rev.fore = bg;
466 vi->mv_rev.back = fg & 0x7;
467 break;
468 }
469 }
470
471 /*
472 * Unlike various other drivers, this driver will never
473 * deallocate TTYs. This means it's safe to temporarily unlock
474 * the TTY when handling ioctls.
475 */
476 tty_unlock(tp);
477 error = tm->tm_class->tc_ioctl(tm, cmd, data, td);
478 tty_lock(tp);
479 if ((error == 0) && (cmd == CONS_CLRHIST)) {
480 /*
481 * Scrollback history has been successfully cleared,
482 * so reset the cursor position to the top left of the screen.
483 */
484 teken_pos_t p;
485 p.tp_row = 0;
486 p.tp_col = 0;
487 teken_set_cursor(&tm->tm_emulator, &p);
488 }
489 return (error);
490 }
491
492 static int
termtty_mmap(struct tty * tp,vm_ooffset_t offset,vm_paddr_t * paddr,int nprot,vm_memattr_t * memattr)493 termtty_mmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t * paddr,
494 int nprot, vm_memattr_t *memattr)
495 {
496 struct terminal *tm = tty_softc(tp);
497
498 return (tm->tm_class->tc_mmap(tm, offset, paddr, nprot, memattr));
499 }
500
501 /*
502 * Binding with the kernel and debug console.
503 */
504
505 static cn_probe_t termcn_cnprobe;
506 static cn_init_t termcn_cninit;
507 static cn_term_t termcn_cnterm;
508 static cn_getc_t termcn_cngetc;
509 static cn_putc_t termcn_cnputc;
510 static cn_grab_t termcn_cngrab;
511 static cn_ungrab_t termcn_cnungrab;
512
513 const struct consdev_ops termcn_cnops = {
514 .cn_probe = termcn_cnprobe,
515 .cn_init = termcn_cninit,
516 .cn_term = termcn_cnterm,
517 .cn_getc = termcn_cngetc,
518 .cn_putc = termcn_cnputc,
519 .cn_grab = termcn_cngrab,
520 .cn_ungrab = termcn_cnungrab,
521 };
522
523 void
termcn_cnregister(struct terminal * tm)524 termcn_cnregister(struct terminal *tm)
525 {
526 struct consdev *cp;
527
528 cp = tm->consdev;
529 if (cp == NULL) {
530 cp = malloc(sizeof(struct consdev), M_TERMINAL,
531 M_WAITOK|M_ZERO);
532 cp->cn_ops = &termcn_cnops;
533 cp->cn_arg = tm;
534 cp->cn_pri = CN_INTERNAL;
535 sprintf(cp->cn_name, "ttyv0");
536
537 tm->tm_flags = TF_CONS;
538 tm->consdev = cp;
539
540 terminal_init(tm);
541 }
542
543 /* Attach terminal as console. */
544 cnadd(cp);
545 }
546
547 static void
termcn_cngrab(struct consdev * cp)548 termcn_cngrab(struct consdev *cp)
549 {
550 struct terminal *tm = cp->cn_arg;
551
552 tm->tm_class->tc_cngrab(tm);
553 }
554
555 static void
termcn_cnungrab(struct consdev * cp)556 termcn_cnungrab(struct consdev *cp)
557 {
558 struct terminal *tm = cp->cn_arg;
559
560 tm->tm_class->tc_cnungrab(tm);
561 }
562
563 static void
termcn_cnprobe(struct consdev * cp)564 termcn_cnprobe(struct consdev *cp)
565 {
566 struct terminal *tm = cp->cn_arg;
567
568 if (tm == NULL) {
569 cp->cn_pri = CN_DEAD;
570 return;
571 }
572
573 tm->consdev = cp;
574 terminal_init(tm);
575
576 tm->tm_class->tc_cnprobe(tm, cp);
577 }
578
579 static void
termcn_cninit(struct consdev * cp)580 termcn_cninit(struct consdev *cp)
581 {
582
583 }
584
585 static void
termcn_cnterm(struct consdev * cp)586 termcn_cnterm(struct consdev *cp)
587 {
588
589 }
590
591 static int
termcn_cngetc(struct consdev * cp)592 termcn_cngetc(struct consdev *cp)
593 {
594 struct terminal *tm = cp->cn_arg;
595
596 return (tm->tm_class->tc_cngetc(tm));
597 }
598
599 static void
termcn_cnputc(struct consdev * cp,int c)600 termcn_cnputc(struct consdev *cp, int c)
601 {
602 struct terminal *tm = cp->cn_arg;
603 teken_attr_t backup;
604 char cv = c;
605
606 TERMINAL_LOCK_CONS(tm);
607 if (!(tm->tm_flags & TF_MUTE)) {
608 backup = *teken_get_curattr(&tm->tm_emulator);
609 teken_set_curattr(&tm->tm_emulator, &kernel_message);
610 teken_input(&tm->tm_emulator, &cv, 1);
611 teken_set_curattr(&tm->tm_emulator, &backup);
612 tm->tm_class->tc_done(tm);
613 }
614 TERMINAL_UNLOCK_CONS(tm);
615 }
616
617 /*
618 * Binding with the terminal emulator.
619 */
620
621 static void
termteken_bell(void * softc)622 termteken_bell(void *softc)
623 {
624 struct terminal *tm = softc;
625
626 tm->tm_flags |= TF_BELL;
627 }
628
629 static void
termteken_cursor(void * softc,const teken_pos_t * p)630 termteken_cursor(void *softc, const teken_pos_t *p)
631 {
632 struct terminal *tm = softc;
633
634 tm->tm_class->tc_cursor(tm, p);
635 }
636
637 static void
termteken_putchar(void * softc,const teken_pos_t * p,teken_char_t c,const teken_attr_t * a)638 termteken_putchar(void *softc, const teken_pos_t *p, teken_char_t c,
639 const teken_attr_t *a)
640 {
641 struct terminal *tm = softc;
642
643 tm->tm_class->tc_putchar(tm, p, TCHAR_CREATE(c, a));
644 }
645
646 static void
termteken_fill(void * softc,const teken_rect_t * r,teken_char_t c,const teken_attr_t * a)647 termteken_fill(void *softc, const teken_rect_t *r, teken_char_t c,
648 const teken_attr_t *a)
649 {
650 struct terminal *tm = softc;
651
652 tm->tm_class->tc_fill(tm, r, TCHAR_CREATE(c, a));
653 }
654
655 static void
termteken_copy(void * softc,const teken_rect_t * r,const teken_pos_t * p)656 termteken_copy(void *softc, const teken_rect_t *r, const teken_pos_t *p)
657 {
658 struct terminal *tm = softc;
659
660 tm->tm_class->tc_copy(tm, r, p);
661 }
662
663 static void
termteken_pre_input(void * softc)664 termteken_pre_input(void *softc)
665 {
666 struct terminal *tm = softc;
667
668 tm->tm_class->tc_pre_input(tm);
669 }
670
671 static void
termteken_post_input(void * softc)672 termteken_post_input(void *softc)
673 {
674 struct terminal *tm = softc;
675
676 tm->tm_class->tc_post_input(tm);
677 }
678
679 static void
termteken_param(void * softc,int cmd,unsigned int arg)680 termteken_param(void *softc, int cmd, unsigned int arg)
681 {
682 struct terminal *tm = softc;
683
684 tm->tm_class->tc_param(tm, cmd, arg);
685 }
686
687 static void
termteken_respond(void * softc,const void * buf,size_t len)688 termteken_respond(void *softc, const void *buf, size_t len)
689 {
690 #if 0
691 struct terminal *tm = softc;
692 struct tty *tp;
693
694 /*
695 * Only inject a response into the TTY if the data actually
696 * originated from the TTY.
697 *
698 * XXX: This cannot be done right now. The TTY could pick up
699 * other locks. It could also in theory cause loops, when the
700 * TTY performs echoing of a command that generates even more
701 * input.
702 */
703 tp = tm->tm_tty;
704 if (tp == NULL)
705 return;
706
707 ttydisc_rint_simple(tp, buf, len);
708 ttydisc_rint_done(tp);
709 #endif
710 }
711