1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 *  linux/arch/arm/kernel/early_printk.c
 4 *
 5 *  Copyright (C) 2009 Sascha Hauer <s.hauer@pengutronix.de>
 
 
 
 
 6 */
 7
 8#include <linux/kernel.h>
 9#include <linux/console.h>
10#include <linux/init.h>
11#include <linux/string.h>
12
13extern void printascii(const char *);
14
15static void early_write(const char *s, unsigned n)
16{
17	char buf[128];
18	while (n) {
19		unsigned l = min(n, sizeof(buf)-1);
20		memcpy(buf, s, l);
21		buf[l] = 0;
22		s += l;
23		n -= l;
24		printascii(buf);
25	}
26}
27
28static void early_console_write(struct console *con, const char *s, unsigned n)
29{
30	early_write(s, n);
31}
32
33static struct console early_console_dev = {
34	.name =		"earlycon",
35	.write =	early_console_write,
36	.flags =	CON_PRINTBUFFER | CON_BOOT,
37	.index =	-1,
38};
39
40static int __init setup_early_printk(char *buf)
41{
42	early_console = &early_console_dev;
43	register_console(&early_console_dev);
44	return 0;
45}
46
47early_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#include <linux/string.h>
15
16extern void printascii(const char *);
17
18static void early_write(const char *s, unsigned n)
19{
20	char buf[128];
21	while (n) {
22		unsigned l = min(n, sizeof(buf)-1);
23		memcpy(buf, s, l);
24		buf[l] = 0;
25		s += l;
26		n -= l;
27		printascii(buf);
28	}
29}
30
31static void early_console_write(struct console *con, const char *s, unsigned n)
32{
33	early_write(s, n);
34}
35
36static struct console early_console_dev = {
37	.name =		"earlycon",
38	.write =	early_console_write,
39	.flags =	CON_PRINTBUFFER | CON_BOOT,
40	.index =	-1,
41};
42
43static int __init setup_early_printk(char *buf)
44{
45	early_console = &early_console_dev;
46	register_console(&early_console_dev);
47	return 0;
48}
49
50early_param("earlyprintk", setup_early_printk);