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/10.1/sys/kern/subr_terminal.c 271769 2014-09-18 14:38:18Z 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_winsize_blank(struct terminal *tm, const struct winsize *size,
  194     int blank, const term_attr_t *attr)
  195 {
  196         term_rect_t r;
  197 
  198         tm->tm_winsize = *size;
  199 
  200         r.tr_begin.tp_row = r.tr_begin.tp_col = 0;
  201         r.tr_end.tp_row = size->ws_row;
  202         r.tr_end.tp_col = size->ws_col;
  203 
  204         TERMINAL_LOCK(tm);
  205         if (blank == 0)
  206                 teken_set_winsize_noreset(&tm->tm_emulator, &r.tr_end);
  207         else
  208                 teken_set_winsize(&tm->tm_emulator, &r.tr_end);
  209         TERMINAL_UNLOCK(tm);
  210 
  211         if ((blank != 0) && !(tm->tm_flags & TF_MUTE))
  212                 tm->tm_class->tc_fill(tm, &r,
  213                     TCHAR_CREATE((teken_char_t)' ', attr));
  214 
  215         terminal_sync_ttysize(tm);
  216 }
  217 
  218 void
  219 terminal_set_winsize(struct terminal *tm, const struct winsize *size)
  220 {
  221 
  222         terminal_set_winsize_blank(tm, size, 1,
  223             (const term_attr_t *)&default_message);
  224 }
  225 
  226 /*
  227  * XXX: This function is a kludge.  Drivers like vt(4) need to
  228  * temporarily stop input when resizing, etc.  This should ideally be
  229  * handled within the driver.
  230  */
  231 
  232 void
  233 terminal_mute(struct terminal *tm, int yes)
  234 {
  235 
  236         TERMINAL_LOCK(tm);
  237         if (yes)
  238                 tm->tm_flags |= TF_MUTE;
  239         else
  240                 tm->tm_flags &= ~TF_MUTE;
  241         TERMINAL_UNLOCK(tm);
  242 }
  243 
  244 void
  245 terminal_input_char(struct terminal *tm, term_char_t c)
  246 {
  247         struct tty *tp;
  248 
  249         tp = tm->tm_tty;
  250         if (tp == NULL)
  251                 return;
  252 
  253         /*
  254          * Strip off any attributes. Also ignore input of second part of
  255          * CJK fullwidth characters, as we don't want to return these
  256          * characters twice.
  257          */
  258         if (TCHAR_FORMAT(c) & TF_CJK_RIGHT)
  259                 return;
  260         c = TCHAR_CHARACTER(c);
  261 
  262         tty_lock(tp);
  263         /*
  264          * Conversion to UTF-8.
  265          */
  266         if (c < 0x80) {
  267                 ttydisc_rint(tp, c, 0);
  268         } else if (c < 0x800) {
  269                 char str[2] = {
  270                         0xc0 | (c >> 6),
  271                         0x80 | (c & 0x3f)
  272                 };
  273 
  274                 ttydisc_rint_simple(tp, str, sizeof str);
  275         } else if (c < 0x10000) {
  276                 char str[3] = {
  277                         0xe0 | (c >> 12),
  278                         0x80 | ((c >> 6) & 0x3f),
  279                         0x80 | (c & 0x3f)
  280                 };
  281 
  282                 ttydisc_rint_simple(tp, str, sizeof str);
  283         } else {
  284                 char str[4] = {
  285                         0xf0 | (c >> 18),
  286                         0x80 | ((c >> 12) & 0x3f),
  287                         0x80 | ((c >> 6) & 0x3f),
  288                         0x80 | (c & 0x3f)
  289                 };
  290 
  291                 ttydisc_rint_simple(tp, str, sizeof str);
  292         }
  293         ttydisc_rint_done(tp);
  294         tty_unlock(tp);
  295 }
  296 
  297 void
  298 terminal_input_raw(struct terminal *tm, char c)
  299 {
  300         struct tty *tp;
  301 
  302         tp = tm->tm_tty;
  303         if (tp == NULL)
  304                 return;
  305 
  306         tty_lock(tp);
  307         ttydisc_rint(tp, c, 0);
  308         ttydisc_rint_done(tp);
  309         tty_unlock(tp);
  310 }
  311 
  312 void
  313 terminal_input_special(struct terminal *tm, unsigned int k)
  314 {
  315         struct tty *tp;
  316         const char *str;
  317 
  318         tp = tm->tm_tty;
  319         if (tp == NULL)
  320                 return;
  321 
  322         str = teken_get_sequence(&tm->tm_emulator, k);
  323         if (str == NULL)
  324                 return;
  325 
  326         tty_lock(tp);
  327         ttydisc_rint_simple(tp, str, strlen(str));
  328         ttydisc_rint_done(tp);
  329         tty_unlock(tp);
  330 }
  331 
  332 /*
  333  * Binding with the TTY layer.
  334  */
  335 
  336 static int
  337 termtty_open(struct tty *tp)
  338 {
  339         struct terminal *tm = tty_softc(tp);
  340 
  341         tm->tm_class->tc_opened(tm, 1);
  342         return (0);
  343 }
  344 
  345 static void
  346 termtty_close(struct tty *tp)
  347 {
  348         struct terminal *tm = tty_softc(tp);
  349 
  350         tm->tm_class->tc_opened(tm, 0);
  351 }
  352 
  353 static void
  354 termtty_outwakeup(struct tty *tp)
  355 {
  356         struct terminal *tm = tty_softc(tp);
  357         char obuf[128];
  358         size_t olen;
  359         unsigned int flags = 0;
  360 
  361         while ((olen = ttydisc_getc(tp, obuf, sizeof obuf)) > 0) {
  362                 TERMINAL_LOCK_TTY(tm);
  363                 if (!(tm->tm_flags & TF_MUTE)) {
  364                         tm->tm_flags &= ~TF_BELL;
  365                         teken_input(&tm->tm_emulator, obuf, olen);
  366                         flags |= tm->tm_flags;
  367                 }
  368                 TERMINAL_UNLOCK_TTY(tm);
  369         }
  370 
  371         tm->tm_class->tc_done(tm);
  372         if (flags & TF_BELL)
  373                 tm->tm_class->tc_bell(tm);
  374 }
  375 
  376 static int
  377 termtty_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
  378 {
  379         struct terminal *tm = tty_softc(tp);
  380         int error;
  381 
  382         switch (cmd) {
  383         case CONS_GETINFO: {
  384                 vid_info_t *vi = (vid_info_t *)data;
  385                 const teken_pos_t *p;
  386                 int fg, bg;
  387 
  388                 if (vi->size != sizeof(vid_info_t))
  389                         return (EINVAL);
  390 
  391                 /* Already help the console driver by filling in some data. */
  392                 p = teken_get_cursor(&tm->tm_emulator);
  393                 vi->mv_row = p->tp_row;
  394                 vi->mv_col = p->tp_col;
  395 
  396                 p = teken_get_winsize(&tm->tm_emulator);
  397                 vi->mv_rsz = p->tp_row;
  398                 vi->mv_csz = p->tp_col;
  399 
  400                 teken_get_defattr_cons25(&tm->tm_emulator, &fg, &bg);
  401                 vi->mv_norm.fore = fg;
  402                 vi->mv_norm.back = bg;
  403                 /* XXX: keep vidcontrol happy; bold backgrounds. */
  404                 vi->mv_rev.fore = bg;
  405                 vi->mv_rev.back = fg & 0x7;
  406                 break;
  407         }
  408         }
  409 
  410         /*
  411          * Unlike various other drivers, this driver will never
  412          * deallocate TTYs.  This means it's safe to temporarily unlock
  413          * the TTY when handling ioctls.
  414          */
  415         tty_unlock(tp);
  416         error = tm->tm_class->tc_ioctl(tm, cmd, data, td);
  417         tty_lock(tp);
  418         return (error);
  419 }
  420 
  421 static int
  422 termtty_mmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t * paddr,
  423     int nprot, vm_memattr_t *memattr)
  424 {
  425         struct terminal *tm = tty_softc(tp);
  426 
  427         return (tm->tm_class->tc_mmap(tm, offset, paddr, nprot, memattr));
  428 }
  429 
  430 /*
  431  * Binding with the kernel and debug console.
  432  */
  433 
  434 static cn_probe_t       termcn_cnprobe;
  435 static cn_init_t        termcn_cninit;
  436 static cn_term_t        termcn_cnterm;
  437 static cn_getc_t        termcn_cngetc;
  438 static cn_putc_t        termcn_cnputc;
  439 static cn_grab_t        termcn_cngrab;
  440 static cn_ungrab_t      termcn_cnungrab;
  441 
  442 const struct consdev_ops termcn_cnops = {
  443         .cn_probe       = termcn_cnprobe,
  444         .cn_init        = termcn_cninit,
  445         .cn_term        = termcn_cnterm,
  446         .cn_getc        = termcn_cngetc,
  447         .cn_putc        = termcn_cnputc,
  448         .cn_grab        = termcn_cngrab,
  449         .cn_ungrab      = termcn_cnungrab,
  450 };
  451 
  452 void
  453 termcn_cnregister(struct terminal *tm)
  454 {
  455         struct consdev *cp;
  456 
  457         cp = tm->consdev;
  458         if (cp == NULL) {
  459                 cp = malloc(sizeof(struct consdev), M_TERMINAL,
  460                     M_WAITOK|M_ZERO);
  461                 cp->cn_ops = &termcn_cnops;
  462                 cp->cn_arg = tm;
  463                 cp->cn_pri = CN_INTERNAL;
  464                 sprintf(cp->cn_name, "ttyv0");
  465 
  466                 tm->tm_flags = TF_CONS;
  467                 tm->consdev = cp;
  468 
  469                 terminal_init(tm);
  470         }
  471 
  472         /* Attach terminal as console. */
  473         cnadd(cp);
  474 }
  475 
  476 static void
  477 termcn_cngrab(struct consdev *cp)
  478 {
  479         struct terminal *tm = cp->cn_arg;
  480 
  481         tm->tm_class->tc_cngrab(tm);
  482 }
  483 
  484 static void
  485 termcn_cnungrab(struct consdev *cp)
  486 {
  487         struct terminal *tm = cp->cn_arg;
  488 
  489         tm->tm_class->tc_cnungrab(tm);
  490 }
  491 
  492 static void
  493 termcn_cnprobe(struct consdev *cp)
  494 {
  495         struct terminal *tm = cp->cn_arg;
  496 
  497         if (tm == NULL) {
  498                 cp->cn_pri = CN_DEAD;
  499                 return;
  500         }
  501 
  502         tm->consdev = cp;
  503         terminal_init(tm);
  504 
  505         tm->tm_class->tc_cnprobe(tm, cp);
  506 }
  507 
  508 static void
  509 termcn_cninit(struct consdev *cp)
  510 {
  511 
  512 }
  513 
  514 static void
  515 termcn_cnterm(struct consdev *cp)
  516 {
  517 
  518 }
  519 
  520 static int
  521 termcn_cngetc(struct consdev *cp)
  522 {
  523         struct terminal *tm = cp->cn_arg;
  524 
  525         return (tm->tm_class->tc_cngetc(tm));
  526 }
  527 
  528 static void
  529 termcn_cnputc(struct consdev *cp, int c)
  530 {
  531         struct terminal *tm = cp->cn_arg;
  532         teken_attr_t backup;
  533         char cv = c;
  534 
  535         TERMINAL_LOCK_CONS(tm);
  536         if (!(tm->tm_flags & TF_MUTE)) {
  537                 backup = *teken_get_curattr(&tm->tm_emulator);
  538                 teken_set_curattr(&tm->tm_emulator, &kernel_message);
  539                 teken_input(&tm->tm_emulator, &cv, 1);
  540                 teken_set_curattr(&tm->tm_emulator, &backup);
  541         }
  542         TERMINAL_UNLOCK_CONS(tm);
  543 
  544         tm->tm_class->tc_done(tm);
  545 }
  546 
  547 /*
  548  * Binding with the terminal emulator.
  549  */
  550 
  551 static void
  552 termteken_bell(void *softc)
  553 {
  554         struct terminal *tm = softc;
  555 
  556         tm->tm_flags |= TF_BELL;
  557 }
  558 
  559 static void
  560 termteken_cursor(void *softc, const teken_pos_t *p)
  561 {
  562         struct terminal *tm = softc;
  563 
  564         tm->tm_class->tc_cursor(tm, p);
  565 }
  566 
  567 static void
  568 termteken_putchar(void *softc, const teken_pos_t *p, teken_char_t c,
  569     const teken_attr_t *a)
  570 {
  571         struct terminal *tm = softc;
  572 
  573         tm->tm_class->tc_putchar(tm, p, TCHAR_CREATE(c, a));
  574 }
  575 
  576 static void
  577 termteken_fill(void *softc, const teken_rect_t *r, teken_char_t c,
  578     const teken_attr_t *a)
  579 {
  580         struct terminal *tm = softc;
  581 
  582         tm->tm_class->tc_fill(tm, r, TCHAR_CREATE(c, a));
  583 }
  584 
  585 static void
  586 termteken_copy(void *softc, const teken_rect_t *r, const teken_pos_t *p)
  587 {
  588         struct terminal *tm = softc;
  589 
  590         tm->tm_class->tc_copy(tm, r, p);
  591 }
  592 
  593 static void
  594 termteken_param(void *softc, int cmd, unsigned int arg)
  595 {
  596         struct terminal *tm = softc;
  597 
  598         tm->tm_class->tc_param(tm, cmd, arg);
  599 }
  600 
  601 static void
  602 termteken_respond(void *softc, const void *buf, size_t len)
  603 {
  604 #if 0
  605         struct terminal *tm = softc;
  606         struct tty *tp;
  607 
  608         /*
  609          * Only inject a response into the TTY if the data actually
  610          * originated from the TTY.
  611          *
  612          * XXX: This cannot be done right now.  The TTY could pick up
  613          * other locks.  It could also in theory cause loops, when the
  614          * TTY performs echoing of a command that generates even more
  615          * input.
  616          */
  617         tp = tm->tm_tty;
  618         if (tp == NULL)
  619                 return;
  620 
  621         ttydisc_rint_simple(tp, buf, len);
  622         ttydisc_rint_done(tp);
  623 #endif
  624 }
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FreeBSD/Linux Kernel Cross Reference sys/kern/subr_terminal.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_terminal.c
