[thirdparty/kernel/stable.git] / arch / arm / kernel / early_printk.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/arch/arm/kernel/early_printk.c
 *
 *  Copyright (C) 2009 Sascha Hauer <s.hauer@pengutronix.de>
 */

#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/string.h>

extern void printascii(const char *);

static void early_write(const char *s, unsigned n)
{
	char buf[128];
	while (n) {
		unsigned l = min(n, sizeof(buf)-1);
		memcpy(buf, s, l);
		buf[l] = 0;
		s += l;
		n -= l;
		printascii(buf);
	}
}

static void early_console_write(struct console *con, const char *s, unsigned n)
{
	early_write(s, n);
}

static struct console early_console_dev = {
	.name =		"earlycon",
	.write =	early_console_write,
	.flags =	CON_PRINTBUFFER | CON_BOOT,
	.index =	-1,
};

static int __init setup_early_printk(char *buf)
{
	early_console = &early_console_dev;
	register_console(&early_console_dev);
	return 0;
}

early_param("earlyprintk", setup_early_printk);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
93fd03a8 CM	2	/*
	3	* linux/arch/arm/kernel/early_printk.c
	4	*
	5	* Copyright (C) 2009 Sascha Hauer <s.hauer@pengutronix.de>
93fd03a8 CM	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/console.h>
	10	#include <linux/init.h>
de880632	11	#include <linux/string.h>
93fd03a8	12
de880632	13	extern void printascii(const char *);
93fd03a8 CM	14
	15	static void early_write(const char *s, unsigned n)
	16	{
de880632 NP	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);
93fd03a8 CM	25	}
	26	}
	27
	28	static void early_console_write(struct console con, const char s, unsigned n)
	29	{
	30	early_write(s, n);
	31	}
	32
d0380e6c	33	static struct console early_console_dev = {
93fd03a8 CM	34	.name = "earlycon",
	35	.write = early_console_write,
	36	.flags = CON_PRINTBUFFER \| CON_BOOT,
	37	.index = -1,
	38	};
	39
93fd03a8 CM	40	static int __init setup_early_printk(char *buf)
93fd03a8 CM	41	{
d0380e6c TG	42	early_console = &early_console_dev;
d0380e6c TG	43	register_console(&early_console_dev);
93fd03a8 CM	44	return 0;
	45	}
	46
	47	early_param("earlyprintk", setup_early_printk);