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sysctl(9): Fix a few mandoc related issues
[FreeBSD/FreeBSD.git] / sys / kern / subr_terminal.c
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2009 The FreeBSD Foundation
5  * All rights reserved.
6  *
7  * This software was developed by Ed Schouten under sponsorship from the
8  * FreeBSD Foundation.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 #include <sys/param.h>
36 #include <sys/cons.h>
37 #include <sys/consio.h>
38 #include <sys/kernel.h>
39 #include <sys/lock.h>
40 #include <sys/malloc.h>
41 #include <sys/mutex.h>
42 #include <sys/systm.h>
43 #include <sys/terminal.h>
44 #include <sys/tty.h>
45
46 #include <machine/stdarg.h>
47
48 static MALLOC_DEFINE(M_TERMINAL, "terminal", "terminal device");
49
50 /*
51  * Locking.
52  *
53  * Normally we don't need to lock down the terminal emulator, because
54  * the TTY lock is already held when calling teken_input().
55  * Unfortunately this is not the case when the terminal acts as a
56  * console device, because cnputc() can be called at the same time.
57  * This means terminals may need to be locked down using a spin lock.
58  */
59 #define TERMINAL_LOCK(tm)       do {                                    \
60         if ((tm)->tm_flags & TF_CONS)                                   \
61                 mtx_lock_spin(&(tm)->tm_mtx);                           \
62         else if ((tm)->tm_tty != NULL)                                  \
63                 tty_lock((tm)->tm_tty);                                 \
64 } while (0)
65 #define TERMINAL_UNLOCK(tm)     do {                                    \
66         if ((tm)->tm_flags & TF_CONS)                                   \
67                 mtx_unlock_spin(&(tm)->tm_mtx);                         \
68         else if ((tm)->tm_tty != NULL)                                  \
69                 tty_unlock((tm)->tm_tty);                               \
70 } while (0)
71 #define TERMINAL_LOCK_TTY(tm)   do {                                    \
72         if ((tm)->tm_flags & TF_CONS)                                   \
73                 mtx_lock_spin(&(tm)->tm_mtx);                           \
74 } while (0)
75 #define TERMINAL_UNLOCK_TTY(tm) do {                                    \
76         if ((tm)->tm_flags & TF_CONS)                                   \
77                 mtx_unlock_spin(&(tm)->tm_mtx);                         \
78 } while (0)
79 #define TERMINAL_LOCK_CONS(tm)          mtx_lock_spin(&(tm)->tm_mtx)
80 #define TERMINAL_UNLOCK_CONS(tm)        mtx_unlock_spin(&(tm)->tm_mtx)
81
82 /*
83  * TTY routines.
84  */
85
86 static tsw_open_t       termtty_open;
87 static tsw_close_t      termtty_close;
88 static tsw_outwakeup_t  termtty_outwakeup;
89 static tsw_ioctl_t      termtty_ioctl;
90 static tsw_mmap_t       termtty_mmap;
91
92 static struct ttydevsw terminal_tty_class = {
93         .tsw_open       = termtty_open,
94         .tsw_close      = termtty_close,
95         .tsw_outwakeup  = termtty_outwakeup,
96         .tsw_ioctl      = termtty_ioctl,
97         .tsw_mmap       = termtty_mmap,
98 };
99
100 /*
101  * Terminal emulator routines.
102  */
103
104 static tf_bell_t        termteken_bell;
105 static tf_cursor_t      termteken_cursor;
106 static tf_putchar_t     termteken_putchar;
107 static tf_fill_t        termteken_fill;
108 static tf_copy_t        termteken_copy;
109 static tf_pre_input_t   termteken_pre_input;
110 static tf_post_input_t  termteken_post_input;
111 static tf_param_t       termteken_param;
112 static tf_respond_t     termteken_respond;
113
114 static teken_funcs_t terminal_drawmethods = {
115         .tf_bell        = termteken_bell,
116         .tf_cursor      = termteken_cursor,
117         .tf_putchar     = termteken_putchar,
118         .tf_fill        = termteken_fill,
119         .tf_copy        = termteken_copy,
120         .tf_pre_input   = termteken_pre_input,
121         .tf_post_input  = termteken_post_input,
122         .tf_param       = termteken_param,
123         .tf_respond     = termteken_respond,
124 };
125
126 /* Kernel message formatting. */
127 static teken_attr_t kernel_message = {
128         .ta_fgcolor     = TCHAR_FGCOLOR(TERMINAL_KERN_ATTR),
129         .ta_bgcolor     = TCHAR_BGCOLOR(TERMINAL_KERN_ATTR),
130         .ta_format      = TCHAR_FORMAT(TERMINAL_KERN_ATTR)
131 };
132
133 static teken_attr_t default_message = {
134         .ta_fgcolor     = TCHAR_FGCOLOR(TERMINAL_NORM_ATTR),
135         .ta_bgcolor     = TCHAR_BGCOLOR(TERMINAL_NORM_ATTR),
136         .ta_format      = TCHAR_FORMAT(TERMINAL_NORM_ATTR)
137 };
138
139 /* Fudge fg brightness as TF_BOLD (shifted). */
140 #define TCOLOR_FG_FUDGED(color) __extension__ ({                        \
141         teken_color_t _c;                                               \
142                                                                         \
143         _c = (color);                                                   \
144         TCOLOR_FG(_c & 7) | ((_c & 8) << 18);                           \
145 })
146
147 /* Fudge bg brightness as TF_BLINK (shifted). */
148 #define TCOLOR_BG_FUDGED(color) __extension__ ({                        \
149         teken_color_t _c;                                               \
150                                                                         \
151         _c = (color);                                                   \
152         TCOLOR_BG(_c & 7) | ((_c & 8) << 20);                           \
153 })
154
155 #define TCOLOR_256TO16(color) __extension__ ({                          \
156         teken_color_t _c;                                               \
157                                                                         \
158         _c = (color);                                                   \
159         if (_c >= 16)                                                   \
160                 _c = teken_256to16(_c);                                 \
161         _c;                                                             \
162 })
163
164 #define TCHAR_CREATE(c, a)      ((c) | TFORMAT((a)->ta_format) |        \
165         TCOLOR_FG_FUDGED(TCOLOR_256TO16((a)->ta_fgcolor)) |             \
166         TCOLOR_BG_FUDGED(TCOLOR_256TO16((a)->ta_bgcolor)))
167
168 static void
169 terminal_init(struct terminal *tm)
170 {
171         int fg, bg;
172
173         if (tm->tm_flags & TF_CONS)
174                 mtx_init(&tm->tm_mtx, "trmlck", NULL, MTX_SPIN);
175
176         teken_init(&tm->tm_emulator, &terminal_drawmethods, tm);
177
178         fg = bg = -1;
179         TUNABLE_INT_FETCH("teken.fg_color", &fg);
180         TUNABLE_INT_FETCH("teken.bg_color", &bg);
181
182         if (fg != -1) {
183                 default_message.ta_fgcolor = fg;
184                 kernel_message.ta_fgcolor = fg;
185         }
186         if (bg != -1) {
187                 default_message.ta_bgcolor = bg;
188                 kernel_message.ta_bgcolor = bg;
189         }
190
191         if (default_message.ta_bgcolor == TC_WHITE) {
192                 default_message.ta_bgcolor |= TC_LIGHT;
193                 kernel_message.ta_bgcolor |= TC_LIGHT;
194         }
195
196         if (default_message.ta_bgcolor == TC_BLACK &&
197             default_message.ta_fgcolor < TC_NCOLORS)
198                 kernel_message.ta_fgcolor |= TC_LIGHT;
199         teken_set_defattr(&tm->tm_emulator, &default_message);
200 }
201
202 struct terminal *
203 terminal_alloc(const struct terminal_class *tc, void *softc)
204 {
205         struct terminal *tm;
206
207         tm = malloc(sizeof(struct terminal), M_TERMINAL, M_WAITOK|M_ZERO);
208         terminal_init(tm);
209
210         tm->tm_class = tc;
211         tm->tm_softc = softc;
212
213         return (tm);
214 }
215
216 static void
217 terminal_sync_ttysize(struct terminal *tm)
218 {
219         struct tty *tp;
220
221         tp = tm->tm_tty;
222         if (tp == NULL)
223                 return;
224
225         tty_lock(tp);
226         tty_set_winsize(tp, &tm->tm_winsize);
227         tty_unlock(tp);
228 }
229
230 void
231 terminal_maketty(struct terminal *tm, const char *fmt, ...)
232 {
233         struct tty *tp;
234         char name[8];
235         va_list ap;
236
237         va_start(ap, fmt);
238         vsnrprintf(name, sizeof name, 32, fmt, ap);
239         va_end(ap);
240
241         tp = tty_alloc(&terminal_tty_class, tm);
242         tty_makedev(tp, NULL, "%s", name);
243         tm->tm_tty = tp;
244         terminal_sync_ttysize(tm);
245 }
246
247 void
248 terminal_set_cursor(struct terminal *tm, const term_pos_t *pos)
249 {
250
251         teken_set_cursor(&tm->tm_emulator, pos);
252 }
253
254 void
255 terminal_set_winsize_blank(struct terminal *tm, const struct winsize *size,
256     int blank, const term_attr_t *attr)
257 {
258         term_rect_t r;
259
260         tm->tm_winsize = *size;
261
262         r.tr_begin.tp_row = r.tr_begin.tp_col = 0;
263         r.tr_end.tp_row = size->ws_row;
264         r.tr_end.tp_col = size->ws_col;
265
266         TERMINAL_LOCK(tm);
267         if (blank == 0)
268                 teken_set_winsize_noreset(&tm->tm_emulator, &r.tr_end);
269         else
270                 teken_set_winsize(&tm->tm_emulator, &r.tr_end);
271         TERMINAL_UNLOCK(tm);
272
273         if ((blank != 0) && !(tm->tm_flags & TF_MUTE))
274                 tm->tm_class->tc_fill(tm, &r,
275                     TCHAR_CREATE((teken_char_t)' ', attr));
276
277         terminal_sync_ttysize(tm);
278 }
279
280 void
281 terminal_set_winsize(struct terminal *tm, const struct winsize *size)
282 {
283
284         terminal_set_winsize_blank(tm, size, 1,
285             (const term_attr_t *)&default_message);
286 }
287
288 /*
289  * XXX: This function is a kludge.  Drivers like vt(4) need to
290  * temporarily stop input when resizing, etc.  This should ideally be
291  * handled within the driver.
292  */
293
294 void
295 terminal_mute(struct terminal *tm, int yes)
296 {
297
298         TERMINAL_LOCK(tm);
299         if (yes)
300                 tm->tm_flags |= TF_MUTE;
301         else
302                 tm->tm_flags &= ~TF_MUTE;
303         TERMINAL_UNLOCK(tm);
304 }
305
306 void
307 terminal_input_char(struct terminal *tm, term_char_t c)
308 {
309         struct tty *tp;
310
311         tp = tm->tm_tty;
312         if (tp == NULL)
313                 return;
314
315         /*
316          * Strip off any attributes. Also ignore input of second part of
317          * CJK fullwidth characters, as we don't want to return these
318          * characters twice.
319          */
320         if (TCHAR_FORMAT(c) & TF_CJK_RIGHT)
321                 return;
322         c = TCHAR_CHARACTER(c);
323
324         tty_lock(tp);
325         /*
326          * Conversion to UTF-8.
327          */
328         if (c < 0x80) {
329                 ttydisc_rint(tp, c, 0);
330         } else if (c < 0x800) {
331                 char str[2] = {
332                         0xc0 | (c >> 6),
333                         0x80 | (c & 0x3f)
334                 };
335
336                 ttydisc_rint_simple(tp, str, sizeof str);
337         } else if (c < 0x10000) {
338                 char str[3] = {
339                         0xe0 | (c >> 12),
340                         0x80 | ((c >> 6) & 0x3f),
341                         0x80 | (c & 0x3f)
342                 };
343
344                 ttydisc_rint_simple(tp, str, sizeof str);
345         } else {
346                 char str[4] = {
347                         0xf0 | (c >> 18),
348                         0x80 | ((c >> 12) & 0x3f),
349                         0x80 | ((c >> 6) & 0x3f),
350                         0x80 | (c & 0x3f)
351                 };
352
353                 ttydisc_rint_simple(tp, str, sizeof str);
354         }
355         ttydisc_rint_done(tp);
356         tty_unlock(tp);
357 }
358
359 void
360 terminal_input_raw(struct terminal *tm, char c)
361 {
362         struct tty *tp;
363
364         tp = tm->tm_tty;
365         if (tp == NULL)
366                 return;
367
368         tty_lock(tp);
369         ttydisc_rint(tp, c, 0);
370         ttydisc_rint_done(tp);
371         tty_unlock(tp);
372 }
373
374 void
375 terminal_input_special(struct terminal *tm, unsigned int k)
376 {
377         struct tty *tp;
378         const char *str;
379
380         tp = tm->tm_tty;
381         if (tp == NULL)
382                 return;
383
384         str = teken_get_sequence(&tm->tm_emulator, k);
385         if (str == NULL)
386                 return;
387
388         tty_lock(tp);
389         ttydisc_rint_simple(tp, str, strlen(str));
390         ttydisc_rint_done(tp);
391         tty_unlock(tp);
392 }
393
394 /*
395  * Binding with the TTY layer.
396  */
397
398 static int
399 termtty_open(struct tty *tp)
400 {
401         struct terminal *tm = tty_softc(tp);
402
403         tm->tm_class->tc_opened(tm, 1);
404         return (0);
405 }
406
407 static void
408 termtty_close(struct tty *tp)
409 {
410         struct terminal *tm = tty_softc(tp);
411
412         tm->tm_class->tc_opened(tm, 0);
413 }
414
415 static void
416 termtty_outwakeup(struct tty *tp)
417 {
418         struct terminal *tm = tty_softc(tp);
419         char obuf[128];
420         size_t olen;
421         unsigned int flags = 0;
422
423         while ((olen = ttydisc_getc(tp, obuf, sizeof obuf)) > 0) {
424                 TERMINAL_LOCK_TTY(tm);
425                 if (!(tm->tm_flags & TF_MUTE)) {
426                         tm->tm_flags &= ~TF_BELL;
427                         teken_input(&tm->tm_emulator, obuf, olen);
428                         flags |= tm->tm_flags;
429                 }
430                 TERMINAL_UNLOCK_TTY(tm);
431         }
432
433         TERMINAL_LOCK_TTY(tm);
434         if (!(tm->tm_flags & TF_MUTE))
435                 tm->tm_class->tc_done(tm);
436         TERMINAL_UNLOCK_TTY(tm);
437         if (flags & TF_BELL)
438                 tm->tm_class->tc_bell(tm);
439 }
440
441 static int
442 termtty_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
443 {
444         struct terminal *tm = tty_softc(tp);
445         int error;
446
447         switch (cmd) {
448         case CONS_GETINFO: {
449                 vid_info_t *vi = (vid_info_t *)data;
450                 const teken_pos_t *p;
451                 int fg, bg;
452
453                 if (vi->size != sizeof(vid_info_t))
454                         return (EINVAL);
455
456                 /* Already help the console driver by filling in some data. */
457                 p = teken_get_cursor(&tm->tm_emulator);
458                 vi->mv_row = p->tp_row;
459                 vi->mv_col = p->tp_col;
460
461                 p = teken_get_winsize(&tm->tm_emulator);
462                 vi->mv_rsz = p->tp_row;
463                 vi->mv_csz = p->tp_col;
464
465                 teken_get_defattr_cons25(&tm->tm_emulator, &fg, &bg);
466                 vi->mv_norm.fore = fg;
467                 vi->mv_norm.back = bg;
468                 /* XXX: keep vidcontrol happy; bold backgrounds. */
469                 vi->mv_rev.fore = bg;
470                 vi->mv_rev.back = fg & 0x7;
471                 break;
472         }
473         }
474
475         /*
476          * Unlike various other drivers, this driver will never
477          * deallocate TTYs.  This means it's safe to temporarily unlock
478          * the TTY when handling ioctls.
479          */
480         tty_unlock(tp);
481         error = tm->tm_class->tc_ioctl(tm, cmd, data, td);
482         tty_lock(tp);
483         if ((error == 0) && (cmd == CONS_CLRHIST)) {
484                 /*
485                  * Scrollback history has been successfully cleared,
486                  * so reset the cursor position to the top left of the screen.
487                  */
488                 teken_pos_t p;
489                 p.tp_row = 0;
490                 p.tp_col = 0;
491                 teken_set_cursor(&tm->tm_emulator, &p);
492         }
493         return (error);
494 }
495
496 static int
497 termtty_mmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t * paddr,
498     int nprot, vm_memattr_t *memattr)
499 {
500         struct terminal *tm = tty_softc(tp);
501
502         return (tm->tm_class->tc_mmap(tm, offset, paddr, nprot, memattr));
503 }
504
505 /*
506  * Binding with the kernel and debug console.
507  */
508
509 static cn_probe_t       termcn_cnprobe;
510 static cn_init_t        termcn_cninit;
511 static cn_term_t        termcn_cnterm;
512 static cn_getc_t        termcn_cngetc;
513 static cn_putc_t        termcn_cnputc;
514 static cn_grab_t        termcn_cngrab;
515 static cn_ungrab_t      termcn_cnungrab;
516
517 const struct consdev_ops termcn_cnops = {
518         .cn_probe       = termcn_cnprobe,
519         .cn_init        = termcn_cninit,
520         .cn_term        = termcn_cnterm,
521         .cn_getc        = termcn_cngetc,
522         .cn_putc        = termcn_cnputc,
523         .cn_grab        = termcn_cngrab,
524         .cn_ungrab      = termcn_cnungrab,
525 };
526
527 void
528 termcn_cnregister(struct terminal *tm)
529 {
530         struct consdev *cp;
531
532         cp = tm->consdev;
533         if (cp == NULL) {
534                 cp = malloc(sizeof(struct consdev), M_TERMINAL,
535                     M_WAITOK|M_ZERO);
536                 cp->cn_ops = &termcn_cnops;
537                 cp->cn_arg = tm;
538                 cp->cn_pri = CN_INTERNAL;
539                 sprintf(cp->cn_name, "ttyv0");
540
541                 tm->tm_flags = TF_CONS;
542                 tm->consdev = cp;
543
544                 terminal_init(tm);
545         }
546
547         /* Attach terminal as console. */
548         cnadd(cp);
549 }
550
551 static void
552 termcn_cngrab(struct consdev *cp)
553 {
554         struct terminal *tm = cp->cn_arg;
555
556         tm->tm_class->tc_cngrab(tm);
557 }
558
559 static void
560 termcn_cnungrab(struct consdev *cp)
561 {
562         struct terminal *tm = cp->cn_arg;
563
564         tm->tm_class->tc_cnungrab(tm);
565 }
566
567 static void
568 termcn_cnprobe(struct consdev *cp)
569 {
570         struct terminal *tm = cp->cn_arg;
571
572         if (tm == NULL) {
573                 cp->cn_pri = CN_DEAD;
574                 return;
575         }
576
577         tm->consdev = cp;
578         terminal_init(tm);
579
580         tm->tm_class->tc_cnprobe(tm, cp);
581 }
582
583 static void
584 termcn_cninit(struct consdev *cp)
585 {
586
587 }
588
589 static void
590 termcn_cnterm(struct consdev *cp)
591 {
592
593 }
594
595 static int
596 termcn_cngetc(struct consdev *cp)
597 {
598         struct terminal *tm = cp->cn_arg;
599
600         return (tm->tm_class->tc_cngetc(tm));
601 }
602
603 static void
604 termcn_cnputc(struct consdev *cp, int c)
605 {
606         struct terminal *tm = cp->cn_arg;
607         teken_attr_t backup;
608         char cv = c;
609
610         TERMINAL_LOCK_CONS(tm);
611         if (!(tm->tm_flags & TF_MUTE)) {
612                 backup = *teken_get_curattr(&tm->tm_emulator);
613                 teken_set_curattr(&tm->tm_emulator, &kernel_message);
614                 teken_input(&tm->tm_emulator, &cv, 1);
615                 teken_set_curattr(&tm->tm_emulator, &backup);
616                 tm->tm_class->tc_done(tm);
617         }
618         TERMINAL_UNLOCK_CONS(tm);
619 }
620
621 /*
622  * Binding with the terminal emulator.
623  */
624
625 static void
626 termteken_bell(void *softc)
627 {
628         struct terminal *tm = softc;
629
630         tm->tm_flags |= TF_BELL;
631 }
632
633 static void
634 termteken_cursor(void *softc, const teken_pos_t *p)
635 {
636         struct terminal *tm = softc;
637
638         tm->tm_class->tc_cursor(tm, p);
639 }
640
641 static void
642 termteken_putchar(void *softc, const teken_pos_t *p, teken_char_t c,
643     const teken_attr_t *a)
644 {
645         struct terminal *tm = softc;
646
647         tm->tm_class->tc_putchar(tm, p, TCHAR_CREATE(c, a));
648 }
649
650 static void
651 termteken_fill(void *softc, const teken_rect_t *r, teken_char_t c,
652     const teken_attr_t *a)
653 {
654         struct terminal *tm = softc;
655
656         tm->tm_class->tc_fill(tm, r, TCHAR_CREATE(c, a));
657 }
658
659 static void
660 termteken_copy(void *softc, const teken_rect_t *r, const teken_pos_t *p)
661 {
662         struct terminal *tm = softc;
663
664         tm->tm_class->tc_copy(tm, r, p);
665 }
666
667 static void
668 termteken_pre_input(void *softc)
669 {
670         struct terminal *tm = softc;
671
672         tm->tm_class->tc_pre_input(tm);
673 }
674
675 static void
676 termteken_post_input(void *softc)
677 {
678         struct terminal *tm = softc;
679
680         tm->tm_class->tc_post_input(tm);
681 }
682
683 static void
684 termteken_param(void *softc, int cmd, unsigned int arg)
685 {
686         struct terminal *tm = softc;
687
688         tm->tm_class->tc_param(tm, cmd, arg);
689 }
690
691 static void
692 termteken_respond(void *softc, const void *buf, size_t len)
693 {
694 #if 0
695         struct terminal *tm = softc;
696         struct tty *tp;
697
698         /*
699          * Only inject a response into the TTY if the data actually
700          * originated from the TTY.
701          *
702          * XXX: This cannot be done right now.  The TTY could pick up
703          * other locks.  It could also in theory cause loops, when the
704          * TTY performs echoing of a command that generates even more
705          * input.
706          */
707         tp = tm->tm_tty;
708         if (tp == NULL)
709                 return;
710
711         ttydisc_rint_simple(tp, buf, len);
712         ttydisc_rint_done(tp);
713 #endif
714 }