[GitHub/mt8127/android_kernel_alcatel_ttab.git] / 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++;
	}
}

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
93fd03a8 CM	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
	15	extern void printch(int);
	16
	17	static 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
	27	static void early_console_write(struct console con, const char s, unsigned n)
	28	{
	29	early_write(s, n);
	30	}
	31
d0380e6c	32	static struct console early_console_dev = {
93fd03a8 CM	33	.name = "earlycon",
	34	.write = early_console_write,
	35	.flags = CON_PRINTBUFFER \| CON_BOOT,
	36	.index = -1,
	37	};
	38
93fd03a8 CM	39	static int __init setup_early_printk(char *buf)
93fd03a8 CM	40	{
d0380e6c TG	41	early_console = &early_console_dev;
d0380e6c TG	42	register_console(&early_console_dev);
93fd03a8 CM	43	return 0;
	44	}
	45
	46	early_param("earlyprintk", setup_early_printk);