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/* $Id: idprom.c,v 1.1.1.1 2004-04-15 01:34:32 phoenix Exp $
 * 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]);
}