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);

 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);