linux-old/arch/sparc/prom/bootstr.c
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   1/* $Id: bootstr.c,v 1.20 2000/02/08 20:24:23 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 */
   6
   7#include <linux/string.h>
   8#include <asm/oplib.h>
   9#include <asm/sun4prom.h>
  10#include <linux/init.h>
  11
  12#define BARG_LEN  256
  13static char barg_buf[BARG_LEN] = { 0 };
  14static char fetched __initdata = 0;
  15
  16extern linux_sun4_romvec *sun4_romvec;
  17
  18char * __init
  19prom_getbootargs(void)
  20{
  21        int iter;
  22        char *cp, *arg;
  23
  24        /* This check saves us from a panic when bootfd patches args. */
  25        if (fetched) {
  26                return barg_buf;
  27        }
  28
  29        switch(prom_vers) {
  30        case PROM_V0:
  31        case PROM_SUN4:
  32                cp = barg_buf;
  33                /* Start from 1 and go over fd(0,0,0)kernel */
  34                for(iter = 1; iter < 8; iter++) {
  35                        arg = (*(romvec->pv_v0bootargs))->argv[iter];
  36                        if(arg == 0) break;
  37                        while(*arg != 0) {
  38                                /* Leave place for space and null. */
  39                                if(cp >= barg_buf + BARG_LEN-2){
  40                                        /* We might issue a warning here. */
  41                                        break;
  42                                }
  43                                *cp++ = *arg++;
  44                        }
  45                        *cp++ = ' ';
  46                }
  47                *cp = 0;
  48                break;
  49        case PROM_V2:
  50        case PROM_V3:
  51                /*
  52                 * V3 PROM cannot supply as with more than 128 bytes
  53                 * of an argument. But a smart bootstrap loader can.
  54                 */
  55                strncpy(barg_buf, *romvec->pv_v2bootargs.bootargs, BARG_LEN-1);
  56                break;
  57        default:
  58                break;
  59        }
  60
  61        fetched = 1;
  62        return barg_buf;
  63}
  64
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