arch/um/kernel/early_printk.c

   1 /*
   2  * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/console.h>
  11 #include <linux/init.h>
  12 #include <os.h>
  13
  14 static void early_console_write(struct console *con, const char *s, unsigned int n)
  15 {
  16         um_early_printk(s, n);
  17 }
  18
  19 static struct console early_console_dev = {
  20         .name = "earlycon",
  21         .write = early_console_write,
  22         .flags = CON_BOOT,
  23         .index = -1,
  24 };
  25
  26 static int __init setup_early_printk(char *buf)
  27 {
  28         if (!early_console) {
  29                 early_console = &early_console_dev;
  30                 register_console(&early_console_dev);
  31         }
  32         return 0;
  33 }
  34
  35 early_param("earlyprintk", setup_early_printk);