arch/sparc64/prom/bootstr.c

   1 /* $Id: bootstr.c,v 1.6 1999/08/31 06:55:01 davem Exp $
   2  * bootstr.c:  Boot string/argument acquisition from the PROM.
   3  *
   4  * Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  * Copyright(C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  */
   7
   8 #include <linux/string.h>
   9 #include <linux/init.h>
  10 #include <asm/oplib.h>
  11
  12 /* WARNING: The boot loader knows that these next three variables come one right
  13  *          after another in the .data section.  Do not move this stuff into
  14  *          the .bss section or it will break things.
  15  */
  16
  17 #define BARG_LEN  256
  18 struct {
  19         int bootstr_len;
  20         int bootstr_valid;
  21         char bootstr_buf[BARG_LEN];
  22 } bootstr_info = {
  23         .bootstr_len = BARG_LEN,
  24 #ifdef CONFIG_CMDLINE
  25         .bootstr_valid = 1,
  26         .bootstr_buf = CONFIG_CMDLINE,
  27 #endif
  28 };
  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 }