xref: /openbmc/linux/drivers/video/logo/logo.c (revision 457c8996)
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 
fb_logo_late_init(void)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  */
fb_find_logo(int depth)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);
107