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 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/9.0/sys/dev/syscons/schistory.c 215034 2010-11-09 10:59:09Z brucec $");
   32 
   33 #include "opt_syscons.h"
   34 
   35 #ifndef SC_NO_HISTORY
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/conf.h>
   40 #include <sys/consio.h>
   41 #include <sys/tty.h>
   42 #include <sys/kernel.h>
   43 #include <sys/malloc.h>
   44 
   45 #if defined(__sparc64__) || defined(__powerpc__)
   46 #include <machine/sc_machdep.h>
   47 #else
   48 #include <machine/pc/display.h>
   49 #endif
   50 
   51 #include <dev/syscons/syscons.h>
   52 
   53 /*
   54  * XXX Placeholder.
   55  * This calculations should be dynamically scaled by number of separate sc
   56  * devices.  A base value of 'extra_history_size' should be defined for
   57  * each syscons unit, and added and subtracted from the dynamic
   58  * 'extra_history_size' as units are added and removed.  This way, each time
   59  * a new syscons unit goes online, extra_history_size is automatically bumped.
   60  */
   61 #define MAXSC   1
   62 
   63 #if !defined(SC_MAX_HISTORY_SIZE)
   64 #define SC_MAX_HISTORY_SIZE     (1000 * MAXCONS * MAXSC)
   65 #endif
   66 
   67 #if !defined(SC_HISTORY_SIZE)
   68 #define SC_HISTORY_SIZE         (ROW * 4)
   69 #endif
   70 
   71 #if (SC_HISTORY_SIZE * MAXCONS * MAXSC) > SC_MAX_HISTORY_SIZE
   72 #undef SC_MAX_HISTORY_SIZE
   73 #define SC_MAX_HISTORY_SIZE     (SC_HISTORY_SIZE * MAXCONS * MAXSC)
   74 #endif
   75 
   76 /* local variables */
   77 static int              extra_history_size
   78                                 = SC_MAX_HISTORY_SIZE - SC_HISTORY_SIZE*MAXCONS;
   79 
   80 /* local functions */
   81 static void copy_history(sc_vtb_t *from, sc_vtb_t *to);
   82 static void history_to_screen(scr_stat *scp);
   83 
   84 /* allocate a history buffer */
   85 int
   86 sc_alloc_history_buffer(scr_stat *scp, int lines, int prev_ysize, int wait)
   87 {
   88         /*
   89          * syscons unconditionally allocates buffers up to 
   90          * SC_HISTORY_SIZE lines or scp->ysize lines, whichever 
   91          * is larger. A value greater than that is allowed, 
   92          * subject to extra_history_size.
   93          */
   94         sc_vtb_t *history;
   95         sc_vtb_t *prev_history;
   96         int cur_lines;                          /* current buffer size */
   97         int min_lines;                          /* guaranteed buffer size */
   98         int delta;                              /* lines to put back */
   99 
  100         if (lines <= 0)
  101                 lines = SC_HISTORY_SIZE;        /* use the default value */
  102 
  103         /* make it at least as large as the screen size */
  104         lines = imax(lines, scp->ysize);
  105 
  106         /* remove the history buffer while we update it */
  107         history = prev_history = scp->history;
  108         scp->history = NULL;
  109 
  110         /* calculate the amount of lines to put back to extra_history_size */
  111         delta = 0;
  112         if (prev_history) {
  113                 cur_lines = sc_vtb_rows(history);
  114                 min_lines = imax(SC_HISTORY_SIZE, prev_ysize);
  115                 if (cur_lines > min_lines)
  116                         delta = cur_lines - min_lines;
  117         }
  118 
  119         /* lines up to min_lines are always allowed. */
  120         min_lines = imax(SC_HISTORY_SIZE, scp->ysize);
  121         if (lines > min_lines) {
  122                 if (lines - min_lines > extra_history_size + delta) {
  123                         /* too many lines are requested */
  124                         scp->history = prev_history;
  125                         return EINVAL;
  126                 }
  127         }
  128 
  129         /* allocate a new buffer */
  130         history = (sc_vtb_t *)malloc(sizeof(*history),
  131                                      M_DEVBUF,
  132                                      (wait) ? M_WAITOK : M_NOWAIT);
  133         if (history != NULL) {
  134                 if (lines > min_lines)
  135                         extra_history_size -= lines - min_lines;
  136                 /* XXX error check? */
  137                 sc_vtb_init(history, VTB_RINGBUFFER, scp->xsize, lines,
  138                             NULL, wait);
  139                 /* FIXME: XXX no good? */
  140                 sc_vtb_clear(history, scp->sc->scr_map[0x20],
  141                              SC_NORM_ATTR << 8);
  142                 if (prev_history != NULL)
  143                         copy_history(prev_history, history);
  144                 scp->history_pos = sc_vtb_tail(history);
  145         } else {
  146                 scp->history_pos = 0;
  147         }
  148 
  149         /* destroy the previous buffer */
  150         if (prev_history != NULL) {
  151                 extra_history_size += delta;
  152                 sc_vtb_destroy(prev_history);
  153                 free(prev_history, M_DEVBUF);
  154         }
  155 
  156         scp->history = history;
  157 
  158         return 0;
  159 }
  160 
  161 static void
  162 copy_history(sc_vtb_t *from, sc_vtb_t *to)
  163 {
  164         int lines;
  165         int cols;
  166         int cols1;
  167         int cols2;
  168         int pos;
  169         int i;
  170 
  171         lines = sc_vtb_rows(from);
  172         cols1 = sc_vtb_cols(from);
  173         cols2 = sc_vtb_cols(to);
  174         cols = imin(cols1, cols2);
  175         pos = sc_vtb_tail(from);
  176         for (i = 0; i < lines; ++i) {
  177                 sc_vtb_append(from, pos, to, cols);
  178                 if (cols < cols2)
  179                         sc_vtb_seek(to, sc_vtb_pos(to, 
  180                                                    sc_vtb_tail(to), 
  181                                                    cols2 - cols));
  182                 pos = sc_vtb_pos(from, pos, cols1);
  183         }
  184 }
  185 
  186 void
  187 sc_free_history_buffer(scr_stat *scp, int prev_ysize)
  188 {
  189         sc_vtb_t *history;
  190         int cur_lines;                          /* current buffer size */
  191         int min_lines;                          /* guaranteed buffer size */
  192 
  193         history = scp->history;
  194         scp->history = NULL;
  195         if (history == NULL)
  196                 return;
  197 
  198         cur_lines = sc_vtb_rows(history);
  199         min_lines = imax(SC_HISTORY_SIZE, prev_ysize);
  200         extra_history_size += (cur_lines > min_lines) ? 
  201                                   cur_lines - min_lines : 0;
  202 
  203         sc_vtb_destroy(history);
  204         free(history, M_DEVBUF);
  205 }
  206 
  207 /* copy entire screen into the top of the history buffer */
  208 void
  209 sc_hist_save(scr_stat *scp)
  210 {
  211         sc_vtb_append(&scp->vtb, 0, scp->history, scp->xsize*scp->ysize);
  212         scp->history_pos = sc_vtb_tail(scp->history);
  213 }
  214 
  215 /* restore the screen by copying from the history buffer */
  216 int
  217 sc_hist_restore(scr_stat *scp)
  218 {
  219         int ret;
  220 
  221         if (scp->history_pos != sc_vtb_tail(scp->history)) {
  222                 scp->history_pos = sc_vtb_tail(scp->history);
  223                 history_to_screen(scp);
  224                 ret =  0;
  225         } else {
  226                 ret = 1;
  227         }
  228         sc_vtb_seek(scp->history, sc_vtb_pos(scp->history, 
  229                                              sc_vtb_tail(scp->history),
  230                                              -scp->xsize*scp->ysize));
  231         return ret;
  232 }
  233 
  234 /* copy screen-full of saved lines */
  235 static void
  236 history_to_screen(scr_stat *scp)
  237 {
  238         int pos;
  239         int i;
  240 
  241         pos = scp->history_pos;
  242         for (i = 1; i <= scp->ysize; ++i) {
  243                 pos = sc_vtb_pos(scp->history, pos, -scp->xsize);
  244                 sc_vtb_copy(scp->history, pos,
  245                             &scp->vtb, scp->xsize*(scp->ysize - i),
  246                             scp->xsize);
  247         }
  248         mark_all(scp);
  249 }
  250 
  251 /* go to the tail of the history buffer */
  252 void
  253 sc_hist_home(scr_stat *scp)
  254 {
  255         scp->history_pos = sc_vtb_tail(scp->history);
  256         history_to_screen(scp);
  257 }
  258 
  259 /* go to the top of the history buffer */
  260 void
  261 sc_hist_end(scr_stat *scp)
  262 {
  263         scp->history_pos = sc_vtb_pos(scp->history, sc_vtb_tail(scp->history),
  264                                       scp->xsize*scp->ysize);
  265         history_to_screen(scp);
  266 }
  267 
  268 /* move one line up */
  269 int
  270 sc_hist_up_line(scr_stat *scp)
  271 {
  272         if (sc_vtb_pos(scp->history, scp->history_pos, -(scp->xsize*scp->ysize))
  273             == sc_vtb_tail(scp->history))
  274                 return -1;
  275         scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,
  276                                       -scp->xsize);
  277         history_to_screen(scp);
  278         return 0;
  279 }
  280 
  281 /* move one line down */
  282 int
  283 sc_hist_down_line(scr_stat *scp)
  284 {
  285         if (scp->history_pos == sc_vtb_tail(scp->history))
  286                 return -1;
  287         scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,
  288                                       scp->xsize);
  289         history_to_screen(scp);
  290         return 0;
  291 }
  292 
  293 int
  294 sc_hist_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
  295 {
  296         scr_stat *scp;
  297         int error;
  298 
  299         switch (cmd) {
  300 
  301         case CONS_HISTORY:      /* set history size */
  302                 scp = SC_STAT(tp);
  303                 if (*(int *)data <= 0)
  304                         return EINVAL;
  305                 if (scp->status & BUFFER_SAVED)
  306                         return EBUSY;
  307                 DPRINTF(5, ("lines:%d, ysize:%d, pool:%d\n",
  308                             *(int *)data, scp->ysize, extra_history_size));
  309                 error = sc_alloc_history_buffer(scp, 
  310                                                imax(*(int *)data, scp->ysize),
  311                                                scp->ysize, TRUE);
  312                 DPRINTF(5, ("error:%d, rows:%d, pool:%d\n", error,
  313                             sc_vtb_rows(scp->history), extra_history_size));
  314                 return error;
  315 
  316         case CONS_CLRHIST:
  317                 scp = SC_STAT(tp);
  318                 sc_vtb_clear(scp->history, scp->sc->scr_map[0x20],
  319                     SC_NORM_ATTR << 8);
  320                 return 0;
  321         }
  322 
  323         return ENOIOCTL;
  324 }
  325 
  326 #endif /* SC_NO_HISTORY */
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FreeBSD/Linux Kernel Cross Reference sys/dev/syscons/schistory.c

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sys/dev/syscons/schistory.c
