schistory.c

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    1 /*-
    2  * Copyright (c) 1999 Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
    3  * Copyright (c) 1992-1998 Søren Schmidt
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer,
   11  *    without modification, immediately at the beginning of the file.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/5.0/sys/dev/syscons/schistory.c 102148 2002-08-19 23:56:01Z peter $
   30  */
   31 
   32 #include "opt_syscons.h"
   33 
   34 #ifndef SC_NO_HISTORY
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/conf.h>
   39 #include <sys/consio.h>
   40 #include <sys/tty.h>
   41 #include <sys/kernel.h>
   42 #include <sys/malloc.h>
   43 
   44 #include <machine/pc/display.h>
   45 
   46 #include <dev/syscons/syscons.h>
   47 
   48 /*
   49  * XXX Placeholder.
   50  * This calculations should be dynamically scaled by number of seperate sc
   51  * devices.  A base value of 'extra_history_size' should be defined for
   52  * each syscons unit, and added and subtracted from the dynamic
   53  * 'extra_history_size' as units are added and removed.  This way, each time
   54  * a new syscons unit goes online, extra_history_size is automatically bumped.
   55  */
   56 #define MAXSC   1
   57 
   58 #if !defined(SC_MAX_HISTORY_SIZE)
   59 #define SC_MAX_HISTORY_SIZE     (1000 * MAXCONS * MAXSC)
   60 #endif
   61 
   62 #if !defined(SC_HISTORY_SIZE)
   63 #define SC_HISTORY_SIZE         (ROW * 4)
   64 #endif
   65 
   66 #if (SC_HISTORY_SIZE * MAXCONS * MAXSC) > SC_MAX_HISTORY_SIZE
   67 #undef SC_MAX_HISTORY_SIZE
   68 #define SC_MAX_HISTORY_SIZE     (SC_HISTORY_SIZE * MAXCONS * MAXSC)
   69 #endif
   70 
   71 /* local variables */
   72 static int              extra_history_size
   73                                 = SC_MAX_HISTORY_SIZE - SC_HISTORY_SIZE*MAXCONS;
   74 
   75 /* local functions */
   76 static void copy_history(sc_vtb_t *from, sc_vtb_t *to);
   77 static void history_to_screen(scr_stat *scp);
   78 
   79 /* allocate a history buffer */
   80 int
   81 sc_alloc_history_buffer(scr_stat *scp, int lines, int prev_ysize, int wait)
   82 {
   83         /*
   84          * syscons unconditionally allocates buffers upto 
   85          * SC_HISTORY_SIZE lines or scp->ysize lines, whichever 
   86          * is larger. A value greater than that is allowed, 
   87          * subject to extra_history_size.
   88          */
   89         sc_vtb_t *history;
   90         sc_vtb_t *prev_history;
   91         int cur_lines;                          /* current buffer size */
   92         int min_lines;                          /* guaranteed buffer size */
   93         int delta;                              /* lines to put back */
   94 
   95         if (lines <= 0)
   96                 lines = SC_HISTORY_SIZE;        /* use the default value */
   97 
   98         /* make it at least as large as the screen size */
   99         lines = imax(lines, scp->ysize);
  100 
  101         /* remove the history buffer while we update it */
  102         history = prev_history = scp->history;
  103         scp->history = NULL;
  104 
  105         /* calculate the amount of lines to put back to extra_history_size */
  106         delta = 0;
  107         if (prev_history) {
  108                 cur_lines = sc_vtb_rows(history);
  109                 min_lines = imax(SC_HISTORY_SIZE, prev_ysize);
  110                 if (cur_lines > min_lines)
  111                         delta = cur_lines - min_lines;
  112         }
  113 
  114         /* lines upto min_lines are always allowed. */
  115         min_lines = imax(SC_HISTORY_SIZE, scp->ysize);
  116         if (lines > min_lines) {
  117                 if (lines - min_lines > extra_history_size + delta) {
  118                         /* too many lines are requested */
  119                         scp->history = prev_history;
  120                         return EINVAL;
  121                 }
  122         }
  123 
  124         /* allocate a new buffer */
  125         history = (sc_vtb_t *)malloc(sizeof(*history),
  126                                      M_DEVBUF,
  127                                      (wait) ? M_WAITOK : M_NOWAIT);
  128         if (history != NULL) {
  129                 if (lines > min_lines)
  130                         extra_history_size -= lines - min_lines;
  131                 /* XXX error check? */
  132                 sc_vtb_init(history, VTB_RINGBUFFER, scp->xsize, lines,
  133                             NULL, wait);
  134                 /* FIXME: XXX no good? */
  135                 sc_vtb_clear(history, scp->sc->scr_map[0x20],
  136                              SC_NORM_ATTR << 8);
  137                 if (prev_history != NULL)
  138                         copy_history(prev_history, history);
  139                 scp->history_pos = sc_vtb_tail(history);
  140         } else {
  141                 scp->history_pos = 0;
  142         }
  143 
  144         /* destroy the previous buffer */
  145         if (prev_history != NULL) {
  146                 extra_history_size += delta;
  147                 sc_vtb_destroy(prev_history);
  148                 free(prev_history, M_DEVBUF);
  149         }
  150 
  151         scp->history = history;
  152 
  153         return 0;
  154 }
  155 
  156 static void
  157 copy_history(sc_vtb_t *from, sc_vtb_t *to)
  158 {
  159         int lines;
  160         int cols;
  161         int cols1;
  162         int cols2;
  163         int pos;
  164         int i;
  165 
  166         lines = sc_vtb_rows(from);
  167         cols1 = sc_vtb_cols(from);
  168         cols2 = sc_vtb_cols(to);
  169         cols = imin(cols1, cols2);
  170         pos = sc_vtb_tail(from);
  171         for (i = 0; i < lines; ++i) {
  172                 sc_vtb_append(from, pos, to, cols);
  173                 if (cols < cols2)
  174                         sc_vtb_seek(to, sc_vtb_pos(to, 
  175                                                    sc_vtb_tail(to), 
  176                                                    cols2 - cols));
  177                 pos = sc_vtb_pos(from, pos, cols1);
  178         }
  179 }
  180 
  181 void
  182 sc_free_history_buffer(scr_stat *scp, int prev_ysize)
  183 {
  184         sc_vtb_t *history;
  185         int cur_lines;                          /* current buffer size */
  186         int min_lines;                          /* guaranteed buffer size */
  187 
  188         history = scp->history;
  189         scp->history = NULL;
  190         if (history == NULL)
  191                 return;
  192 
  193         cur_lines = sc_vtb_rows(history);
  194         min_lines = imax(SC_HISTORY_SIZE, prev_ysize);
  195         extra_history_size += (cur_lines > min_lines) ? 
  196                                   cur_lines - min_lines : 0;
  197 
  198         sc_vtb_destroy(history);
  199         free(history, M_DEVBUF);
  200 }
  201 
  202 /* copy entire screen into the top of the history buffer */
  203 void
  204 sc_hist_save(scr_stat *scp)
  205 {
  206         sc_vtb_append(&scp->vtb, 0, scp->history, scp->xsize*scp->ysize);
  207         scp->history_pos = sc_vtb_tail(scp->history);
  208 }
  209 
  210 /* restore the screen by copying from the history buffer */
  211 int
  212 sc_hist_restore(scr_stat *scp)
  213 {
  214         int ret;
  215 
  216         if (scp->history_pos != sc_vtb_tail(scp->history)) {
  217                 scp->history_pos = sc_vtb_tail(scp->history);
  218                 history_to_screen(scp);
  219                 ret =  0;
  220         } else {
  221                 ret = 1;
  222         }
  223         sc_vtb_seek(scp->history, sc_vtb_pos(scp->history, 
  224                                              sc_vtb_tail(scp->history),
  225                                              -scp->xsize*scp->ysize));
  226         return ret;
  227 }
  228 
  229 /* copy screen-full of saved lines */
  230 static void
  231 history_to_screen(scr_stat *scp)
  232 {
  233         int pos;
  234         int i;
  235 
  236         pos = scp->history_pos;
  237         for (i = 1; i <= scp->ysize; ++i) {
  238                 pos = sc_vtb_pos(scp->history, pos, -scp->xsize);
  239                 sc_vtb_copy(scp->history, pos,
  240                             &scp->vtb, scp->xsize*(scp->ysize - i),
  241                             scp->xsize);
  242         }
  243         mark_all(scp);
  244 }
  245 
  246 /* go to the tail of the history buffer */
  247 void
  248 sc_hist_home(scr_stat *scp)
  249 {
  250         scp->history_pos = sc_vtb_tail(scp->history);
  251         history_to_screen(scp);
  252 }
  253 
  254 /* go to the top of the history buffer */
  255 void
  256 sc_hist_end(scr_stat *scp)
  257 {
  258         scp->history_pos = sc_vtb_pos(scp->history, sc_vtb_tail(scp->history),
  259                                       scp->xsize*scp->ysize);
  260         history_to_screen(scp);
  261 }
  262 
  263 /* move one line up */
  264 int
  265 sc_hist_up_line(scr_stat *scp)
  266 {
  267         if (sc_vtb_pos(scp->history, scp->history_pos, -(scp->xsize*scp->ysize))
  268             == sc_vtb_tail(scp->history))
  269                 return -1;
  270         scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,
  271                                       -scp->xsize);
  272         history_to_screen(scp);
  273         return 0;
  274 }
  275 
  276 /* move one line down */
  277 int
  278 sc_hist_down_line(scr_stat *scp)
  279 {
  280         if (scp->history_pos == sc_vtb_tail(scp->history))
  281                 return -1;
  282         scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,
  283                                       scp->xsize);
  284         history_to_screen(scp);
  285         return 0;
  286 }
  287 
  288 int
  289 sc_hist_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag,
  290               struct thread *td)
  291 {
  292         scr_stat *scp;
  293         int error;
  294 
  295         switch (cmd) {
  296 
  297         case CONS_HISTORY:      /* set history size */
  298                 scp = SC_STAT(tp->t_dev);
  299                 if (*(int *)data <= 0)
  300                         return EINVAL;
  301                 if (scp->status & BUFFER_SAVED)
  302                         return EBUSY;
  303                 DPRINTF(5, ("lines:%d, ysize:%d, pool:%d\n",
  304                             *(int *)data, scp->ysize, extra_history_size));
  305                 error = sc_alloc_history_buffer(scp, 
  306                                                imax(*(int *)data, scp->ysize),
  307                                                scp->ysize, TRUE);
  308                 DPRINTF(5, ("error:%d, rows:%d, pool:%d\n", error,
  309                             sc_vtb_rows(scp->history), extra_history_size));
  310                 return error;
  311 
  312         case CONS_CLRHIST:
  313                 scp = SC_STAT(tp->t_dev);
  314                 sc_vtb_clear(scp->history, scp->sc->scr_map[0x20],
  315                     SC_NORM_ATTR << 8);
  316                 return 0;
  317         }
  318 
  319         return ENOIOCTL;
  320 }
  321 
  322 #endif /* SC_NO_HISTORY */
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FreeBSD/Linux Kernel Cross Reference sys/dev/syscons/schistory.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/syscons/schistory.c
