1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (c) 2014 Finn Thain
7 */
8
9#include <linux/kernel.h>
10#include <linux/console.h>
11#include <linux/init.h>
12#include <linux/string.h>
13#include <asm/setup.h>
14
15
16#include "../mvme16x/mvme16x.h"
17
18asmlinkage void __init debug_cons_nputs(const char *s, unsigned n);
19
20static void __ref debug_cons_write(struct console *c,
21 const char *s, unsigned n)
22{
23#if !(defined(CONFIG_SUN3) || defined(CONFIG_M68000) || \
24 defined(CONFIG_COLDFIRE))
25 if (MACH_IS_MVME16x)
26 mvme16x_cons_write(co: c, str: s, count: n);
27 else
28 debug_cons_nputs(s, n);
29#endif
30}
31
32static struct console early_console_instance = {
33 .name = "debug",
34 .write = debug_cons_write,
35 .flags = CON_PRINTBUFFER | CON_BOOT,
36 .index = -1
37};
38
39static int __init setup_early_printk(char *buf)
40{
41 if (early_console || buf)
42 return 0;
43
44 early_console = &early_console_instance;
45 register_console(early_console);
46
47 return 0;
48}
49early_param("earlyprintk", setup_early_printk);
50
51/*
52 * debug_cons_nputs() defined in arch/m68k/kernel/head.S cannot be called
53 * after init sections are discarded (for platforms that use it).
54 */
55#if !(defined(CONFIG_SUN3) || defined(CONFIG_M68000) || \
56 defined(CONFIG_COLDFIRE))
57
58static int __init unregister_early_console(void)
59{
60 if (!early_console || MACH_IS_MVME16x)
61 return 0;
62
63 return unregister_console(early_console);
64}
65late_initcall(unregister_early_console);
66
67#endif
68

source code of linux/arch/m68k/kernel/early_printk.c