arch/sparc64/kernel/idprom.c

   1 /*
   2  * idprom.c: Routines to load the idprom into kernel addresses and
   3  *           interpret the data contained within.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/types.h>
  10 #include <linux/init.h>
  11
  12 #include <asm/oplib.h>
  13 #include <asm/idprom.h>
  14
  15 struct idprom *idprom;
  16 static struct idprom idprom_buffer;
  17
  18 /* Calculate the IDPROM checksum (xor of the data bytes). */
  19 static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
  20 {
  21         unsigned char cksum, i, *ptr = (unsigned char *)idprom;
  22
  23         for (i = cksum = 0; i <= 0x0E; i++)
  24                 cksum ^= *ptr++;
  25
  26         return cksum;
  27 }
  28
  29 /* Create a local IDPROM copy and verify integrity. */
  30 void __init idprom_init(void)
  31 {
  32         prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer));
  33
  34         idprom = &idprom_buffer;
  35
  36         if (idprom->id_format != 0x01)  {
  37                 prom_printf("IDPROM: Warning, unknown format type!\n");
  38         }
  39
  40         if (idprom->id_cksum != calc_idprom_cksum(idprom)) {
  41                 prom_printf("IDPROM: Warning, checksum failure (nvram=%x, calc=%x)!\n",
  42                             idprom->id_cksum, calc_idprom_cksum(idprom));
  43         }
  44
  45         printk("Ethernet address: %02x:%02x:%02x:%02x:%02x:%02x\n",
  46                idprom->id_ethaddr[0], idprom->id_ethaddr[1],
  47                idprom->id_ethaddr[2], idprom->id_ethaddr[3],
  48                idprom->id_ethaddr[4], idprom->id_ethaddr[5]);
  49 }