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idprom.c

/*
 * idprom.c: Routines to load the idprom into kernel addresses and
 *           interpret the data contained within.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>

#include <asm/oplib.h>
#include <asm/idprom.h>

struct idprom *idprom;
static struct idprom idprom_buffer;

/* Calculate the IDPROM checksum (xor of the data bytes). */
static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
{
      unsigned char cksum, i, *ptr = (unsigned char *)idprom;

      for (i = cksum = 0; i <= 0x0E; i++)
            cksum ^= *ptr++;

      return cksum;
}

/* Create a local IDPROM copy and verify integrity. */
void __init idprom_init(void)
{
      prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer));

      idprom = &idprom_buffer;

      if (idprom->id_format != 0x01)  {
            prom_printf("IDPROM: Warning, unknown format type!\n");
      }

      if (idprom->id_cksum != calc_idprom_cksum(idprom)) {
            prom_printf("IDPROM: Warning, checksum failure (nvram=%x, calc=%x)!\n",
                      idprom->id_cksum, calc_idprom_cksum(idprom));
      }

      printk("Ethernet address: %02x:%02x:%02x:%02x:%02x:%02x\n",
             idprom->id_ethaddr[0], idprom->id_ethaddr[1],
             idprom->id_ethaddr[2], idprom->id_ethaddr[3],
             idprom->id_ethaddr[4], idprom->id_ethaddr[5]);
}

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