drivers/video/logo/logo.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 /*
   4  *  Linux logo to be displayed on boot
   5  *
   6  *  Copyright (C) 1996 Larry Ewing (lewing@isc.tamu.edu)
   7  *  Copyright (C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8  *  Copyright (C) 2001 Greg Banks <gnb@alphalink.com.au>
   9  *  Copyright (C) 2001 Jan-Benedict Glaw <jbglaw@lug-owl.de>
  10  *  Copyright (C) 2003 Geert Uytterhoeven <geert@linux-m68k.org>
  11  */
  12
  13 #include <linux/linux_logo.h>
  14 #include <linux/stddef.h>
  15 #include <linux/module.h>
  16
  17 #ifdef CONFIG_M68K
  18 #include <asm/setup.h>
  19 #endif
  20
  21 static bool nologo;
  22 module_param(nologo, bool, 0);
  23 MODULE_PARM_DESC(nologo, "Disables startup logo");
  24
  25 /*
  26  * Logos are located in the initdata, and will be freed in kernel_init.
  27  * Use late_init to mark the logos as freed to prevent any further use.
  28  */
  29
  30 static bool logos_freed;
  31
  32 static int __init fb_logo_late_init(void)
  33 {
  34         logos_freed = true;
  35         return 0;
  36 }
  37
  38 late_initcall_sync(fb_logo_late_init);
  39
  40 /* logo's are marked __initdata. Use __ref to tell
  41  * modpost that it is intended that this function uses data
  42  * marked __initdata.
  43  */
  44 const struct linux_logo * __ref fb_find_logo(int depth)
  45 {
  46         const struct linux_logo *logo = NULL;
  47
  48         if (nologo || logos_freed)
  49                 return NULL;
  50
  51         if (depth >= 1) {
  52 #ifdef CONFIG_LOGO_LINUX_MONO
  53                 /* Generic Linux logo */
  54                 logo = &logo_linux_mono;
  55 #endif
  56 #ifdef CONFIG_LOGO_SUPERH_MONO
  57                 /* SuperH Linux logo */
  58                 logo = &logo_superh_mono;
  59 #endif
  60         }
  61
  62         if (depth >= 4) {
  63 #ifdef CONFIG_LOGO_LINUX_VGA16
  64                 /* Generic Linux logo */
  65                 logo = &logo_linux_vga16;
  66 #endif
  67 #ifdef CONFIG_LOGO_SUPERH_VGA16
  68                 /* SuperH Linux logo */
  69                 logo = &logo_superh_vga16;
  70 #endif
  71         }
  72
  73         if (depth >= 8) {
  74 #ifdef CONFIG_LOGO_LINUX_CLUT224
  75                 /* Generic Linux logo */
  76                 logo = &logo_linux_clut224;
  77 #endif
  78 #ifdef CONFIG_LOGO_DEC_CLUT224
  79                 /* DEC Linux logo on MIPS/MIPS64 or ALPHA */
  80                 logo = &logo_dec_clut224;
  81 #endif
  82 #ifdef CONFIG_LOGO_MAC_CLUT224
  83                 /* Macintosh Linux logo on m68k */
  84                 if (MACH_IS_MAC)
  85                         logo = &logo_mac_clut224;
  86 #endif
  87 #ifdef CONFIG_LOGO_PARISC_CLUT224
  88                 /* PA-RISC Linux logo */
  89                 logo = &logo_parisc_clut224;
  90 #endif
  91 #ifdef CONFIG_LOGO_SGI_CLUT224
  92                 /* SGI Linux logo on MIPS/MIPS64 */
  93                 logo = &logo_sgi_clut224;
  94 #endif
  95 #ifdef CONFIG_LOGO_SUN_CLUT224
  96                 /* Sun Linux logo */
  97                 logo = &logo_sun_clut224;
  98 #endif
  99 #ifdef CONFIG_LOGO_SUPERH_CLUT224
 100                 /* SuperH Linux logo */
 101                 logo = &logo_superh_clut224;
 102 #endif
 103         }
 104         return logo;
 105 }
 106 EXPORT_SYMBOL_GPL(fb_find_logo);