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 #ifdef CONFIG_LOGO_LINUX_MONO 52 if (depth >= 1) 53 logo = &logo_linux_mono; 54 #endif 55 56 #ifdef CONFIG_LOGO_LINUX_VGA16 57 if (depth >= 4) 58 logo = &logo_linux_vga16; 59 #endif 60 61 #ifdef CONFIG_LOGO_LINUX_CLUT224 62 if (depth >= 8) 63 logo = &logo_linux_clut224; 64 #endif 65 66 return logo; 67 } 68 EXPORT_SYMBOL_GPL(fb_find_logo); 69