bootstr_64.c 1.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * bootstr.c: Boot string/argument acquisition from the PROM.
  4. *
  5. * Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu)
  6. * Copyright(C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  7. */
  8. #include <linux/string.h>
  9. #include <linux/init.h>
  10. #include <asm/oplib.h>
  11. /* WARNING: The boot loader knows that these next three variables come one right
  12. * after another in the .data section. Do not move this stuff into
  13. * the .bss section or it will break things.
  14. */
  15. /* We limit BARG_LEN to 1024 because this is the size of the
  16. * 'barg_out' command line buffer in the SILO bootloader.
  17. */
  18. #define BARG_LEN 1024
  19. struct {
  20. int bootstr_len;
  21. int bootstr_valid;
  22. char bootstr_buf[BARG_LEN];
  23. } bootstr_info = {
  24. .bootstr_len = BARG_LEN,
  25. #ifdef CONFIG_CMDLINE
  26. .bootstr_valid = 1,
  27. .bootstr_buf = CONFIG_CMDLINE,
  28. #endif
  29. };
  30. char * __init
  31. prom_getbootargs(void)
  32. {
  33. /* This check saves us from a panic when bootfd patches args. */
  34. if (bootstr_info.bootstr_valid)
  35. return bootstr_info.bootstr_buf;
  36. prom_getstring(prom_chosen_node, "bootargs",
  37. bootstr_info.bootstr_buf, BARG_LEN);
  38. bootstr_info.bootstr_valid = 1;
  39. return bootstr_info.bootstr_buf;
  40. }