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 = {
33	.name =		"earlycon",
34	.write =	early_console_write,
35	.flags =	CON_PRINTBUFFER | CON_BOOT,
36	.index =	-1,
37};
38
39asmlinkage void early_printk(const char *fmt, ...)
40{
41	char buf[512];
42	int n;
43	va_list ap;
44
45	va_start(ap, fmt);
46	n = vscnprintf(buf, sizeof(buf), fmt, ap);
47	early_write(buf, n);
48	va_end(ap);
49}
50
51static int __init setup_early_printk(char *buf)
52{
53	register_console(&early_console);
54	return 0;
55}
56
57early_param("earlyprintk", setup_early_printk);

 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 = {
33	.name =		"earlycon",
34	.write =	early_console_write,
35	.flags =	CON_PRINTBUFFER | CON_BOOT,
36	.index =	-1,
37};
38
39asmlinkage void early_printk(const char *fmt, ...)
40{
41	char buf[512];
42	int n;
43	va_list ap;
44
45	va_start(ap, fmt);
46	n = vscnprintf(buf, sizeof(buf), fmt, ap);
47	early_write(buf, n);
48	va_end(ap);
49}
50
51static int __init setup_early_printk(char *buf)
52{
53	register_console(&early_console);
54	return 0;
55}
56
57early_param("earlyprintk", setup_early_printk);