bootstr_32.c

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/*
 * bootstr.c:  Boot string/argument acquisition from the PROM.
 *
 * Copyright(C) 1995 David S. Miller ([email protected])
 */

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

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

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:
        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 == NULL)
                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;
}