blob: 43076536965c6631741f135472192cb79c1e2041 [file] [log] [blame]
Catalin Marinas93fd03a2009-12-09 10:02:18 +00001/*
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
Thomas Gleixnerd0380e62013-04-29 16:17:18 -070032static struct console early_console_dev = {
Catalin Marinas93fd03a2009-12-09 10:02:18 +000033 .name = "earlycon",
34 .write = early_console_write,
35 .flags = CON_PRINTBUFFER | CON_BOOT,
36 .index = -1,
37};
38
Catalin Marinas93fd03a2009-12-09 10:02:18 +000039static int __init setup_early_printk(char *buf)
40{
Thomas Gleixnerd0380e62013-04-29 16:17:18 -070041 early_console = &early_console_dev;
42 register_console(&early_console_dev);
Catalin Marinas93fd03a2009-12-09 10:02:18 +000043 return 0;
44}
45
46early_param("earlyprintk", setup_early_printk);