1/* $Id: idprom.c,v 1.1.1.1 2007/08/03 18:52:18 Exp $
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
15struct idprom *idprom;
16static struct idprom idprom_buffer;
17
18/* Calculate the IDPROM checksum (xor of the data bytes). */
19static 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. */
30void __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}
50