LXR linux/arch/mips/kernel/early

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 2002, 2003, 06, 07 Ralf Baechle (ralf@linux-mips.org)
   7 * Copyright (C) 2007 MIPS Technologies, Inc.
   8 *   written by Ralf Baechle (ralf@linux-mips.org)
   9 */
  10#include <linux/console.h>
  11#include <linux/init.h>
  12
  13#include <asm/setup.h>
  14
  15extern void prom_putchar(char);
  16
  17static void __init
  18early_console_write(struct console *con, const char *s, unsigned n)
  19{
  20        while (n-- && *s) {
  21                if (*s == '\n')
  22                        prom_putchar('\r');
  23                prom_putchar(*s);
  24                s++;
  25        }
  26}
  27
  28static struct console early_console __initdata = {
  29        .name   = "early",
  30        .write  = early_console_write,
  31        .flags  = CON_PRINTBUFFER | CON_BOOT,
  32        .index  = -1
  33};
  34
  35static int early_console_initialized __initdata;
  36
  37void __init setup_early_printk(void)
  38{
  39        if (early_console_initialized)
  40                return;
  41        early_console_initialized = 1;
  42
  43        register_console(&early_console);
  44}
  45