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
 21static bool nologo;
 22module_param(nologo, bool, 0);
 23MODULE_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
 30static bool logos_freed;
 31
 32static int __init fb_logo_late_init(void)
 33{
 34	logos_freed = true;
 35	return 0;
 36}
 37
 38late_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 */
 44const 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}
106EXPORT_SYMBOL_GPL(fb_find_logo);