1/*
2 *  linux/arch/arm/kernel/early_printk.c
3 *
4 *  Copyright (C) 2009 Sascha Hauer <s.hauer@pengutronix.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/kernel.h>
12#include <linux/console.h>
13#include <linux/init.h>
14
15extern void printch(int);
16
17static void early_write(const char *s, unsigned n)
18{
19	while (n-- > 0) {
20		if (*s == '\n')
21			printch('\r');
22		printch(*s);
23		s++;
24	}
25}
26
27static void early_console_write(struct console *con, const char *s, unsigned n)
28{
29	early_write(s, n);
30}
31
32static struct console early_console_dev = {
33	.name =		"earlycon",
34	.write =	early_console_write,
35	.flags =	CON_PRINTBUFFER | CON_BOOT,
36	.index =	-1,
37};
38
39static int __init setup_early_printk(char *buf)
40{
41	early_console = &early_console_dev;
42	register_console(&early_console_dev);
43	return 0;
44}
45
46early_param("earlyprintk", setup_early_printk);
47