47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
/*
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* idprom.c: Routines to load the idprom into kernel addresses and
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* interpret the data contained within.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <asm/oplib.h>
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#include <asm/idprom.h>
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struct idprom *idprom;
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static struct idprom idprom_buffer;
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/* Calculate the IDPROM checksum (xor of the data bytes). */
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static unsigned char __init calc_idprom_cksum(struct idprom *idprom)
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{
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unsigned char cksum, i, *ptr = (unsigned char *)idprom;
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for (i = cksum = 0; i <= 0x0E; i++)
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cksum ^= *ptr++;
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return cksum;
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}
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/* Create a local IDPROM copy and verify integrity. */
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void __init idprom_init(void)
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{
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prom_get_idprom((char *) &idprom_buffer, sizeof(idprom_buffer));
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idprom = &idprom_buffer;
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if (idprom->id_format != 0x01) {
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prom_printf("IDPROM: Warning, unknown format type!\n");
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}
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if (idprom->id_cksum != calc_idprom_cksum(idprom)) {
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prom_printf("IDPROM: Warning, checksum failure (nvram=%x, calc=%x)!\n",
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idprom->id_cksum, calc_idprom_cksum(idprom));
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}
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printk("Ethernet address: %pM\n", idprom->id_ethaddr);
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}
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