early_printk.c 663 B

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