arch/um/kernel/early_printk.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/console.h>
   8 #include <linux/init.h>
   9 #include <os.h>
  10
  11 static void early_console_write(struct console *con, const char *s, unsigned int n)
  12 {
  13         um_early_printk(s, n);
  14 }
  15
  16 static struct console early_console_dev = {
  17         .name = "earlycon",
  18         .write = early_console_write,
  19         .flags = CON_BOOT,
  20         .index = -1,
  21 };
  22
  23 static int __init setup_early_printk(char *buf)
  24 {
  25         if (!early_console) {
  26                 early_console = &early_console_dev;
  27                 register_console(&early_console_dev);
  28         }
  29         return 0;
  30 }
  31
  32 early_param("earlyprintk", setup_early_printk);