idprom.c
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上传日期:2013-04-10
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- /* $Id: idprom.c,v 1.3 1999/08/31 06:54:53 davem 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:%02xn",
- idprom->id_ethaddr[0], idprom->id_ethaddr[1],
- idprom->id_ethaddr[2], idprom->id_ethaddr[3],
- idprom->id_ethaddr[4], idprom->id_ethaddr[5]);
- }