arch/mips/kernel/early_printk.c

   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 extern void prom_putchar(char);
  14
  15 static void early_console_write(struct console *con, const char *s, unsigned n)
  16 {
  17         while (n-- && *s) {
  18                 if (*s == '\n')
  19                         prom_putchar('\r');
  20                 prom_putchar(*s);
  21                 s++;
  22         }
  23 }
  24
  25 static struct console early_console = {
  26         .name   = "early",
  27         .write  = early_console_write,
  28         .flags  = CON_PRINTBUFFER | CON_BOOT,
  29         .index  = -1
  30 };
  31
  32 void __init setup_early_printk(void)
  33 {
  34         register_console(&early_console);
  35 }
  36
  37 void __init disable_early_printk(void)
  38 {
  39         unregister_console(&early_console);
  40 }