The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_terminal.c

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    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: releng/10.4/sys/kern/subr_terminal.c 274860 2014-11-22 16:55:55Z dumbbell $");
   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         tm->tm_class->tc_done(tm);
  379         if (flags & TF_BELL)
  380                 tm->tm_class->tc_bell(tm);
  381 }
  382 
  383 static int
  384 termtty_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
  385 {
  386         struct terminal *tm = tty_softc(tp);
  387         int error;
  388 
  389         switch (cmd) {
  390         case CONS_GETINFO: {
  391                 vid_info_t *vi = (vid_info_t *)data;
  392                 const teken_pos_t *p;
  393                 int fg, bg;
  394 
  395                 if (vi->size != sizeof(vid_info_t))
  396                         return (EINVAL);
  397 
  398                 /* Already help the console driver by filling in some data. */
  399                 p = teken_get_cursor(&tm->tm_emulator);
  400                 vi->mv_row = p->tp_row;
  401                 vi->mv_col = p->tp_col;
  402 
  403                 p = teken_get_winsize(&tm->tm_emulator);
  404                 vi->mv_rsz = p->tp_row;
  405                 vi->mv_csz = p->tp_col;
  406 
  407                 teken_get_defattr_cons25(&tm->tm_emulator, &fg, &bg);
  408                 vi->mv_norm.fore = fg;
  409                 vi->mv_norm.back = bg;
  410                 /* XXX: keep vidcontrol happy; bold backgrounds. */
  411                 vi->mv_rev.fore = bg;
  412                 vi->mv_rev.back = fg & 0x7;
  413                 break;
  414         }
  415         }
  416 
  417         /*
  418          * Unlike various other drivers, this driver will never
  419          * deallocate TTYs.  This means it's safe to temporarily unlock
  420          * the TTY when handling ioctls.
  421          */
  422         tty_unlock(tp);
  423         error = tm->tm_class->tc_ioctl(tm, cmd, data, td);
  424         tty_lock(tp);
  425         return (error);
  426 }
  427 
  428 static int
  429 termtty_mmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t * paddr,
  430     int nprot, vm_memattr_t *memattr)
  431 {
  432         struct terminal *tm = tty_softc(tp);
  433 
  434         return (tm->tm_class->tc_mmap(tm, offset, paddr, nprot, memattr));
  435 }
  436 
  437 /*
  438  * Binding with the kernel and debug console.
  439  */
  440 
  441 static cn_probe_t       termcn_cnprobe;
  442 static cn_init_t        termcn_cninit;
  443 static cn_term_t        termcn_cnterm;
  444 static cn_getc_t        termcn_cngetc;
  445 static cn_putc_t        termcn_cnputc;
  446 static cn_grab_t        termcn_cngrab;
  447 static cn_ungrab_t      termcn_cnungrab;
  448 
  449 const struct consdev_ops termcn_cnops = {
  450         .cn_probe       = termcn_cnprobe,
  451         .cn_init        = termcn_cninit,
  452         .cn_term        = termcn_cnterm,
  453         .cn_getc        = termcn_cngetc,
  454         .cn_putc        = termcn_cnputc,
  455         .cn_grab        = termcn_cngrab,
  456         .cn_ungrab      = termcn_cnungrab,
  457 };
  458 
  459 void
  460 termcn_cnregister(struct terminal *tm)
  461 {
  462         struct consdev *cp;
  463 
  464         cp = tm->consdev;
  465         if (cp == NULL) {
  466                 cp = malloc(sizeof(struct consdev), M_TERMINAL,
  467                     M_WAITOK|M_ZERO);
  468                 cp->cn_ops = &termcn_cnops;
  469                 cp->cn_arg = tm;
  470                 cp->cn_pri = CN_INTERNAL;
  471                 sprintf(cp->cn_name, "ttyv0");
  472 
  473                 tm->tm_flags = TF_CONS;
  474                 tm->consdev = cp;
  475 
  476                 terminal_init(tm);
  477         }
  478 
  479         /* Attach terminal as console. */
  480         cnadd(cp);
  481 }
  482 
  483 static void
  484 termcn_cngrab(struct consdev *cp)
  485 {
  486         struct terminal *tm = cp->cn_arg;
  487 
  488         tm->tm_class->tc_cngrab(tm);
  489 }
  490 
  491 static void
  492 termcn_cnungrab(struct consdev *cp)
  493 {
  494         struct terminal *tm = cp->cn_arg;
  495 
  496         tm->tm_class->tc_cnungrab(tm);
  497 }
  498 
  499 static void
  500 termcn_cnprobe(struct consdev *cp)
  501 {
  502         struct terminal *tm = cp->cn_arg;
  503 
  504         if (tm == NULL) {
  505                 cp->cn_pri = CN_DEAD;
  506                 return;
  507         }
  508 
  509         tm->consdev = cp;
  510         terminal_init(tm);
  511 
  512         tm->tm_class->tc_cnprobe(tm, cp);
  513 }
  514 
  515 static void
  516 termcn_cninit(struct consdev *cp)
  517 {
  518 
  519 }
  520 
  521 static void
  522 termcn_cnterm(struct consdev *cp)
  523 {
  524 
  525 }
  526 
  527 static int
  528 termcn_cngetc(struct consdev *cp)
  529 {
  530         struct terminal *tm = cp->cn_arg;
  531 
  532         return (tm->tm_class->tc_cngetc(tm));
  533 }
  534 
  535 static void
  536 termcn_cnputc(struct consdev *cp, int c)
  537 {
  538         struct terminal *tm = cp->cn_arg;
  539         teken_attr_t backup;
  540         char cv = c;
  541 
  542         TERMINAL_LOCK_CONS(tm);
  543         if (!(tm->tm_flags & TF_MUTE)) {
  544                 backup = *teken_get_curattr(&tm->tm_emulator);
  545                 teken_set_curattr(&tm->tm_emulator, &kernel_message);
  546                 teken_input(&tm->tm_emulator, &cv, 1);
  547                 teken_set_curattr(&tm->tm_emulator, &backup);
  548         }
  549         TERMINAL_UNLOCK_CONS(tm);
  550 
  551         tm->tm_class->tc_done(tm);
  552 }
  553 
  554 /*
  555  * Binding with the terminal emulator.
  556  */
  557 
  558 static void
  559 termteken_bell(void *softc)
  560 {
  561         struct terminal *tm = softc;
  562 
  563         tm->tm_flags |= TF_BELL;
  564 }
  565 
  566 static void
  567 termteken_cursor(void *softc, const teken_pos_t *p)
  568 {
  569         struct terminal *tm = softc;
  570 
  571         tm->tm_class->tc_cursor(tm, p);
  572 }
  573 
  574 static void
  575 termteken_putchar(void *softc, const teken_pos_t *p, teken_char_t c,
  576     const teken_attr_t *a)
  577 {
  578         struct terminal *tm = softc;
  579 
  580         tm->tm_class->tc_putchar(tm, p, TCHAR_CREATE(c, a));
  581 }
  582 
  583 static void
  584 termteken_fill(void *softc, const teken_rect_t *r, teken_char_t c,
  585     const teken_attr_t *a)
  586 {
  587         struct terminal *tm = softc;
  588 
  589         tm->tm_class->tc_fill(tm, r, TCHAR_CREATE(c, a));
  590 }
  591 
  592 static void
  593 termteken_copy(void *softc, const teken_rect_t *r, const teken_pos_t *p)
  594 {
  595         struct terminal *tm = softc;
  596 
  597         tm->tm_class->tc_copy(tm, r, p);
  598 }
  599 
  600 static void
  601 termteken_param(void *softc, int cmd, unsigned int arg)
  602 {
  603         struct terminal *tm = softc;
  604 
  605         tm->tm_class->tc_param(tm, cmd, arg);
  606 }
  607 
  608 static void
  609 termteken_respond(void *softc, const void *buf, size_t len)
  610 {
  611 #if 0
  612         struct terminal *tm = softc;
  613         struct tty *tp;
  614 
  615         /*
  616          * Only inject a response into the TTY if the data actually
  617          * originated from the TTY.
  618          *
  619          * XXX: This cannot be done right now.  The TTY could pick up
  620          * other locks.  It could also in theory cause loops, when the
  621          * TTY performs echoing of a command that generates even more
  622          * input.
  623          */
  624         tp = tm->tm_tty;
  625         if (tp == NULL)
  626                 return;
  627 
  628         ttydisc_rint_simple(tp, buf, len);
  629         ttydisc_rint_done(tp);
  630 #endif
  631 }

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