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bootstr.c

/*
 * bootstr.c:  Boot string/argument acquisition from the PROM.
 *
 * Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright(C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */

#include <linux/string.h>
#include <linux/init.h>
#include <asm/oplib.h>

/* WARNING: The boot loader knows that these next three variables come one right
 *          after another in the .data section.  Do not move this stuff into
 *          the .bss section or it will break things.
 */

#define BARG_LEN  256
struct {
      int bootstr_len;
      int bootstr_valid;
      char bootstr_buf[BARG_LEN];
} bootstr_info = {
      .bootstr_len = BARG_LEN,
#ifdef CONFIG_CMDLINE
      .bootstr_valid = 1,
      .bootstr_buf = CONFIG_CMDLINE,
#endif
};

char * __init
prom_getbootargs(void)
{
      /* This check saves us from a panic when bootfd patches args. */
      if (bootstr_info.bootstr_valid)
            return bootstr_info.bootstr_buf;
      prom_getstring(prom_chosen_node, "bootargs",
                   bootstr_info.bootstr_buf, BARG_LEN);
      bootstr_info.bootstr_valid = 1;
      return bootstr_info.bootstr_buf;
}

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