Release 4.11 arch/arm/kernel/early_printk.c

/*
 *  linux/arch/arm/kernel/early_printk.c
 *
 *  Copyright (C) 2009 Sascha Hauer <s.hauer@pengutronix.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

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

extern void printch(int);



static void early_write(const char *s, unsigned n)
{
	while (n-- > 0) {
		if (*s == '\n')
			printch('\r');
		printch(*s);
		s++;
	}
}

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

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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;
}

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early_param("earlyprintk", setup_early_printk);
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Directory: arch/arm/kernel

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