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/kernel.h>
  11#include <linux/console.h>
  12#include <linux/printk.h>
  13#include <linux/init.h>
  14
  15#include <asm/setup.h>
  16
  17extern void prom_putchar(char);
  18
  19static void early_console_write(struct console *con, const char *s, unsigned n)
  20{
  21        while (n-- && *s) {
  22                if (*s == '\n')
  23                        prom_putchar('\r');
  24                prom_putchar(*s);
  25                s++;
  26        }
  27}
  28
  29static struct console early_console_prom = {
  30        .name   = "early",
  31        .write  = early_console_write,
  32        .flags  = CON_PRINTBUFFER | CON_BOOT,
  33        .index  = -1
  34};
  35
  36void __init setup_early_printk(void)
  37{
  38        if (early_console)
  39                return;
  40        early_console = &early_console_prom;
  41
  42        register_console(&early_console_prom);
  43}
  44