snake_saver.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1995-1998 Søren Schmidt
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer,
   12  *    without modification, immediately at the beginning of the file.
   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  * 3. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  * $FreeBSD$
   31  */
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/module.h>
   36 #include <sys/malloc.h>
   37 #include <sys/kernel.h>
   38 #include <sys/sysctl.h>
   39 #include <sys/consio.h>
   40 #include <sys/fbio.h>
   41 #include <sys/resourcevar.h>
   42 #include <sys/smp.h>
   43 
   44 #include <machine/pc/display.h>
   45 
   46 #include <dev/fb/fbreg.h>
   47 #include <dev/fb/splashreg.h>
   48 #include <dev/syscons/syscons.h>
   49 
   50 static u_char   *message;
   51 static int      *messagep;
   52 static int      messagelen;
   53 static int      blanked;
   54 
   55 #define MSGBUF_LEN      70
   56 
   57 static int      nofancy = 0;
   58 TUNABLE_INT("hw.syscons.saver_snake_nofancy", &nofancy);
   59 
   60 #define FANCY_SNAKE     (!nofancy)
   61 #define LOAD_HIGH(ld)   (((ld * 100 + FSCALE / 2) >> FSHIFT) / 100)
   62 #define LOAD_LOW(ld)    (((ld * 100 + FSCALE / 2) >> FSHIFT) % 100)
   63 
   64 static inline void update_msg(void);
   65 
   66 static int
   67 snake_saver(video_adapter_t *adp, int blank)
   68 {
   69         static int      dirx, diry;
   70         int             f, color, load;
   71         sc_softc_t      *sc;
   72         scr_stat        *scp;
   73 
   74 /* XXX hack for minimal changes. */
   75 #define save    message
   76 #define savs    messagep
   77 
   78         sc = sc_find_softc(adp, NULL);
   79         if (sc == NULL)
   80                 return EAGAIN;
   81         scp = sc->cur_scp;
   82 
   83         if (blank) {
   84                 if (adp->va_info.vi_flags & V_INFO_GRAPHICS)
   85                         return EAGAIN;
   86                 if (blanked <= 0) {
   87                         sc_vtb_clear(&scp->scr, sc->scr_map[0x20],
   88                                      (FG_LIGHTGREY | BG_BLACK) << 8);
   89                         vidd_set_hw_cursor(adp, -1, -1);
   90                         sc_set_border(scp, 0);
   91                         dirx = (scp->xpos ? 1 : -1);
   92                         diry = (scp->ypos ?
   93                                 scp->xsize : -scp->xsize);
   94                         for (f=0; f< messagelen; f++)
   95                                 savs[f] = scp->xpos + scp->ypos*scp->xsize;
   96                         sc_vtb_putc(&scp->scr, savs[0], sc->scr_map[*save],
   97                                     (FG_LIGHTGREY | BG_BLACK) << 8);
   98                         blanked = 1;
   99                 }
  100                 if (blanked++ < 4)
  101                         return 0;
  102                 blanked = 1;
  103                 sc_vtb_putc(&scp->scr, savs[messagelen - 1], sc->scr_map[0x20],
  104                             (FG_LIGHTGREY | BG_BLACK) << 8);
  105                 for (f=messagelen-1; f > 0; f--)
  106                         savs[f] = savs[f-1];
  107                 f = savs[0];
  108                 if ((f % scp->xsize) == 0 ||
  109                     (f % scp->xsize) == scp->xsize - 1 ||
  110                     (random() % 50) == 0)
  111                         dirx = -dirx;
  112                 if ((f / scp->xsize) == 0 ||
  113                     (f / scp->xsize) == scp->ysize - 1 ||
  114                     (random() % 20) == 0)
  115                         diry = -diry;
  116                 savs[0] += dirx + diry;
  117                 if (FANCY_SNAKE) {
  118                         update_msg();
  119                         load = ((averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT);
  120                         if (load == 0)
  121                                 color = FG_LIGHTGREY | BG_BLACK;
  122                         else if (load / mp_ncpus <= 50)
  123                                 color = FG_LIGHTGREEN | BG_BLACK;
  124                         else if (load / mp_ncpus <= 75)
  125                                 color = FG_YELLOW | BG_BLACK;
  126                         else if (load / mp_ncpus <= 99)
  127                                 color = FG_LIGHTRED | BG_BLACK;
  128                         else
  129                                 color = FG_RED | FG_BLINK | BG_BLACK;
  130                 } else
  131                         color = FG_LIGHTGREY | BG_BLACK;
  132 
  133                 for (f=messagelen-1; f>=0; f--)
  134                         sc_vtb_putc(&scp->scr, savs[f], sc->scr_map[save[f]],
  135                                     color << 8);
  136         } else
  137                 blanked = 0;
  138 
  139         return 0;
  140 }
  141 
  142 static inline void
  143 update_msg(void)
  144 {
  145         if (!FANCY_SNAKE) {
  146                 messagelen = sprintf(message, "%s %s", ostype, osrelease);
  147                 return;
  148         }
  149         messagelen = snprintf(message, MSGBUF_LEN,
  150             "%s %s (%d.%02d %d.%02d, %d.%02d)",
  151             ostype, osrelease,
  152             LOAD_HIGH(averunnable.ldavg[0]), LOAD_LOW(averunnable.ldavg[0]),
  153             LOAD_HIGH(averunnable.ldavg[1]), LOAD_LOW(averunnable.ldavg[1]),
  154             LOAD_HIGH(averunnable.ldavg[2]), LOAD_LOW(averunnable.ldavg[2]));
  155 }
  156 
  157 static int
  158 snake_init(video_adapter_t *adp)
  159 {
  160         message = malloc(MSGBUF_LEN, M_DEVBUF, M_WAITOK);
  161         messagep = malloc(MSGBUF_LEN * sizeof *messagep, M_DEVBUF, M_WAITOK);
  162         update_msg();
  163         return 0;
  164 }
  165 
  166 static int
  167 snake_term(video_adapter_t *adp)
  168 {
  169         free(message, M_DEVBUF);
  170         free(messagep, M_DEVBUF);
  171         return 0;
  172 }
  173 
  174 static scrn_saver_t snake_module = {
  175         "snake_saver", snake_init, snake_term, snake_saver, NULL,
  176 };
  177 
  178 SAVER_MODULE(snake_saver, snake_module);

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FreeBSD/Linux Kernel Cross Reference sys/dev/syscons/snake/snake_saver.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/syscons/snake/snake_saver.c