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bootstr.c

/* $Id: bootstr.c,v 1.20 2000/02/08 20:24:23 davem Exp $
 * bootstr.c:  Boot string/argument acquisition from the PROM.
 *
 * Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu)
 */

#include <linux/string.h>
#include <asm/oplib.h>
#include <asm/sun4prom.h>
#include <linux/init.h>

#define BARG_LEN  256
static char barg_buf[BARG_LEN] = { 0 };
static char fetched __initdata = 0;

extern linux_sun4_romvec *sun4_romvec;

char * __init
prom_getbootargs(void)
{
      int iter;
      char *cp, *arg;

      /* This check saves us from a panic when bootfd patches args. */
      if (fetched) {
            return barg_buf;
      }

      switch(prom_vers) {
      case PROM_V0:
      case PROM_SUN4:
            cp = barg_buf;
            /* Start from 1 and go over fd(0,0,0)kernel */
            for(iter = 1; iter < 8; iter++) {
                  arg = (*(romvec->pv_v0bootargs))->argv[iter];
                  if(arg == 0) break;
                  while(*arg != 0) {
                        /* Leave place for space and null. */
                        if(cp >= barg_buf + BARG_LEN-2){
                              /* We might issue a warning here. */
                              break;
                        }
                        *cp++ = *arg++;
                  }
                  *cp++ = ' ';
            }
            *cp = 0;
            break;
      case PROM_V2:
      case PROM_V3:
            /*
             * V3 PROM cannot supply as with more than 128 bytes
             * of an argument. But a smart bootstrap loader can.
             */
            strlcpy(barg_buf, *romvec->pv_v2bootargs.bootargs, sizeof(barg_buf));
            break;
      default:
            break;
      }

      fetched = 1;
      return barg_buf;
}

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