drivers/video/logo/logo.c

   1
   2 /*
   3  *  Linux logo to be displayed on boot
   4  *
   5  *  Copyright (C) 1996 Larry Ewing (lewing@isc.tamu.edu)
   6  *  Copyright (C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  *  Copyright (C) 2001 Greg Banks <gnb@alphalink.com.au>
   8  *  Copyright (C) 2001 Jan-Benedict Glaw <jbglaw@lug-owl.de>
   9  *  Copyright (C) 2003 Geert Uytterhoeven <geert@linux-m68k.org>
  10  */
  11
  12 #include <linux/linux_logo.h>
  13 #include <linux/stddef.h>
  14 #include <linux/module.h>
  15
  16 #ifdef CONFIG_M68K
  17 #include <asm/setup.h>
  18 #endif
  19
  20 static bool nologo;
  21 module_param(nologo, bool, 0);
  22 MODULE_PARM_DESC(nologo, "Disables startup logo");
  23
  24 /*
  25  * Logos are located in the initdata, and will be freed in kernel_init.
  26  * Use late_init to mark the logos as freed to prevent any further use.
  27  */
  28
  29 static bool logos_freed;
  30
  31 static int __init fb_logo_late_init(void)
  32 {
  33         logos_freed = true;
  34         return 0;
  35 }
  36
  37 late_initcall_sync(fb_logo_late_init);
  38
  39 /* logo's are marked __initdata. Use __ref to tell
  40  * modpost that it is intended that this function uses data
  41  * marked __initdata.
  42  */
  43 const struct linux_logo * __ref fb_find_logo(int depth)
  44 {
  45         const struct linux_logo *logo = NULL;
  46
  47         if (nologo || logos_freed)
  48                 return NULL;
  49
  50         if (depth >= 1) {
  51 #ifdef CONFIG_LOGO_LINUX_MONO
  52                 /* Generic Linux logo */
  53                 logo = &logo_linux_mono;
  54 #endif
  55 #ifdef CONFIG_LOGO_SUPERH_MONO
  56                 /* SuperH Linux logo */
  57                 logo = &logo_superh_mono;
  58 #endif
  59         }
  60
  61         if (depth >= 4) {
  62 #ifdef CONFIG_LOGO_LINUX_VGA16
  63                 /* Generic Linux logo */
  64                 logo = &logo_linux_vga16;
  65 #endif
  66 #ifdef CONFIG_LOGO_SUPERH_VGA16
  67                 /* SuperH Linux logo */
  68                 logo = &logo_superh_vga16;
  69 #endif
  70         }
  71
  72         if (depth >= 8) {
  73 #ifdef CONFIG_LOGO_LINUX_CLUT224
  74                 /* Generic Linux logo */
  75                 logo = &logo_linux_clut224;
  76 #endif
  77 #ifdef CONFIG_LOGO_DEC_CLUT224
  78                 /* DEC Linux logo on MIPS/MIPS64 or ALPHA */
  79                 logo = &logo_dec_clut224;
  80 #endif
  81 #ifdef CONFIG_LOGO_MAC_CLUT224
  82                 /* Macintosh Linux logo on m68k */
  83                 if (MACH_IS_MAC)
  84                         logo = &logo_mac_clut224;
  85 #endif
  86 #ifdef CONFIG_LOGO_PARISC_CLUT224
  87                 /* PA-RISC Linux logo */
  88                 logo = &logo_parisc_clut224;
  89 #endif
  90 #ifdef CONFIG_LOGO_SGI_CLUT224
  91                 /* SGI Linux logo on MIPS/MIPS64 */
  92                 logo = &logo_sgi_clut224;
  93 #endif
  94 #ifdef CONFIG_LOGO_SUN_CLUT224
  95                 /* Sun Linux logo */
  96                 logo = &logo_sun_clut224;
  97 #endif
  98 #ifdef CONFIG_LOGO_SUPERH_CLUT224
  99                 /* SuperH Linux logo */
 100                 logo = &logo_superh_clut224;
 101 #endif
 102         }
 103         return logo;
 104 }
 105 EXPORT_SYMBOL_GPL(fb_find_logo);