early_printk.c

Go to the documentation of this file.

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2002, 2003, 06, 07 Ralf Baechle ([email protected])
 * Copyright (C) 2007 MIPS Technologies, Inc.
 *   written by Ralf Baechle ([email protected])
 */
#include <linux/console.h>
#include <linux/init.h>

#include <asm/setup.h>

extern void prom_putchar(char);

static void __init
early_console_write(struct console *con, const char *s, unsigned n)
{
    while (n-- && *s) {
        if (*s == '\n')
            prom_putchar('\r');
        prom_putchar(*s);
        s++;
    }
}

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

static int early_console_initialized __initdata;

void __init setup_early_printk(void)
{
    if (early_console_initialized)
        return;
    early_console_initialized = 1;

    register_console(&early_console);
}