The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/fb/splash.c

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    1 /*-
    2  * Copyright (c) 1999 Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer as
   10  *    the first lines of this file unmodified.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/5.2/sys/dev/fb/splash.c 119418 2003-08-24 17:55:58Z obrien $");
   30 
   31 #include "opt_splash.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/malloc.h>
   36 #include <sys/linker.h>
   37 #include <sys/fbio.h>
   38 #include <sys/kernel.h>
   39 
   40 #include <dev/fb/fbreg.h>
   41 #include <dev/fb/splashreg.h>
   42 
   43 MODULE_VERSION(splash, 1);
   44 
   45 /* video adapter and image decoder */
   46 static video_adapter_t  *splash_adp;
   47 static splash_decoder_t *splash_decoder;
   48 
   49 /* decoder candidates */
   50 static int              decoders;
   51 static splash_decoder_t **decoder_set;
   52 #define DECODER_ARRAY_DELTA 4
   53 
   54 /* console driver callback */
   55 static int              (*splash_callback)(int, void *);
   56 static void             *splash_arg;
   57 
   58 static int
   59 splash_find_data(splash_decoder_t *decoder)
   60 {
   61         caddr_t image_module;
   62         caddr_t p;
   63 
   64         if (decoder->data_type == NULL)
   65                 return 0;
   66         image_module = preload_search_by_type(decoder->data_type);
   67         if (image_module == NULL)
   68                 return ENOENT;
   69         p = preload_search_info(image_module, MODINFO_ADDR);
   70         if (p == NULL)
   71                 return ENOENT;
   72         decoder->data = *(void **)p;
   73         p = preload_search_info(image_module, MODINFO_SIZE);
   74         if (p == NULL)
   75                 return ENOENT;
   76         decoder->data_size = *(size_t *)p;
   77         if (bootverbose)
   78                 printf("splash: image@%p, size:%lu\n",
   79                        (void *)decoder->data, (long)decoder->data_size);
   80         return 0;
   81 }
   82 
   83 static int
   84 splash_test(splash_decoder_t *decoder)
   85 {
   86         if (splash_find_data(decoder))
   87                 return ENOENT;  /* XXX */
   88         if (*decoder->init && (*decoder->init)(splash_adp)) {
   89                 decoder->data = NULL;
   90                 decoder->data_size = 0;
   91                 return ENODEV;  /* XXX */
   92         }
   93         if (bootverbose)
   94                 printf("splash: image decoder found: %s\n", decoder->name);
   95         return 0;
   96 }
   97 
   98 static void
   99 splash_new(splash_decoder_t *decoder)
  100 {
  101         splash_decoder = decoder;
  102         if (splash_callback != NULL)
  103                 (*splash_callback)(SPLASH_INIT, splash_arg);
  104 }
  105 
  106 int
  107 splash_register(splash_decoder_t *decoder)
  108 {
  109         splash_decoder_t **p;
  110         int error;
  111         int i;
  112 
  113         if (splash_adp != NULL) {
  114                 /*
  115                  * If the video card has aleady been initialized, test
  116                  * this decoder immediately.
  117                  */
  118                 error = splash_test(decoder);
  119                 if (error == 0) {
  120                         /* replace the current decoder with new one */
  121                         if (splash_decoder != NULL)
  122                                 error = splash_term(splash_adp);
  123                         if (error == 0)
  124                                 splash_new(decoder);
  125                 }
  126                 return error;
  127         } else {
  128                 /* register the decoder for later use */
  129                 for (i = 0; i < decoders; ++i) {
  130                         if (decoder_set[i] == NULL)
  131                                 break;
  132                 }
  133                 if ((i >= decoders) && (decoders % DECODER_ARRAY_DELTA) == 0) {
  134                         p = malloc(sizeof(*p)*(decoders + DECODER_ARRAY_DELTA),
  135                                 M_DEVBUF, M_NOWAIT);
  136                         if (p == NULL)
  137                                 return ENOMEM;
  138                         if (decoder_set != NULL) {
  139                                 bcopy(decoder_set, p, sizeof(*p)*decoders);
  140                                 free(decoder_set, M_DEVBUF);
  141                         }
  142                         decoder_set = p;
  143                         i = decoders++;
  144                 }
  145                 decoder_set[i] = decoder;
  146         }
  147 
  148         return 0;
  149 }
  150 
  151 int
  152 splash_unregister(splash_decoder_t *decoder)
  153 {
  154         int error;
  155 
  156         if (splash_decoder == decoder) {
  157                 if ((error = splash_term(splash_adp)) != 0)
  158                         return error;
  159         }
  160         return 0;
  161 }
  162 
  163 int
  164 splash_init(video_adapter_t *adp, int (*callback)(int, void *), void *arg)
  165 {
  166         int i;
  167 
  168         splash_adp = adp;
  169         splash_callback = callback;
  170         splash_arg = arg;
  171 
  172         splash_decoder = NULL;
  173         for (i = 0; i < decoders; ++i) {
  174                 if (decoder_set[i] == NULL)
  175                         continue;
  176                 if (splash_test(decoder_set[i]) == 0) {
  177                         splash_new(decoder_set[i]);
  178                         break;
  179                 }
  180                 decoder_set[i] = NULL;
  181         }
  182         for (++i; i < decoders; ++i) {
  183                 decoder_set[i] = NULL;
  184         }
  185         return 0;
  186 }
  187 
  188 int
  189 splash_term(video_adapter_t *adp)
  190 {
  191         int error = 0;
  192 
  193         if (splash_adp != adp)
  194                 return EINVAL;
  195         if (splash_decoder != NULL) {
  196                 if (splash_callback != NULL)
  197                         error = (*splash_callback)(SPLASH_TERM, splash_arg);
  198                 if (error == 0 && splash_decoder->term)
  199                         error = (*splash_decoder->term)(adp);
  200                 if (error == 0)
  201                         splash_decoder = NULL;
  202         }
  203         return error;
  204 }
  205 
  206 int
  207 splash(video_adapter_t *adp, int on)
  208 {
  209         if (splash_decoder != NULL)
  210                 return (*splash_decoder->splash)(adp, on);
  211         return ENODEV;
  212 }

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