NetBSD/sys/arch/sun3x/dev/idprom.c

/*	$NetBSD: idprom.c,v 1.5 1997/10/16 15:56:02 gwr Exp $	*/

/*-
 * Copyright (c) 1996 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Adam Glass and Gordon W. Ross.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Machine ID PROM - system type and serial number
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>

#include <machine/autoconf.h>
#include <machine/idprom.h>
#include <machine/obio.h>
#include <machine/machdep.h>
#include <machine/mon.h>

/*
 * This structure is what this driver is all about.
 * It is copied from the device early in startup.
 */
struct idprom identity_prom;

static int idprom_hostid __P((void));

/*
 * Find the IDPROM and copy it to memory.
 * This is called early during startup,
 * but late enough so peek_byte() works.
 * Called by machdep.c:identifycpu()
 */
void
idprom_init()
{
	u_char *src, *dst;
	caddr_t va;
	int len, x, xorsum;

	/* First, probe for a separate IDPROM (3/470). */
	va = obio_find_mapping(OBIO_IDPROM1, IDPROM_SIZE);
	if (peek_byte(va) == -1) {
		/* IDPROM is in the EEPROM */
		va = obio_find_mapping(OBIO_IDPROM2, IDPROM_SIZE);
	}

	/* Copy the IDPROM contents and do the checksum. */
	dst = (u_char *) &identity_prom;
	src = (u_char *) va;
	len = IDPROM_SIZE;
	xorsum = 0;	/* calculated as xor of data */

	do {
		x = *src++;
		*dst++ = x;
		xorsum ^= x;
	} while (--len > 0);

	if (xorsum != 0)
		printf("idprom: bad checksum\n");
	if (identity_prom.idp_format < 1)
		printf("idprom: bad version\n");

	hostid = idprom_hostid();
}

static int
idprom_hostid()
{
	struct idprom *idp;
	union {
		long l;
		char c[4];
	} hid;

	/*
	 * Construct the hostid from the idprom contents.
	 * This appears to be the way SunOS does it.
	 */
	idp = &identity_prom;
	hid.c[0] = idp->idp_machtype;
	hid.c[1] = idp->idp_serialnum[0];
	hid.c[2] = idp->idp_serialnum[1];
	hid.c[3] = idp->idp_serialnum[2];
	return (hid.l);
}

void
idprom_etheraddr(eaddrp)
	u_char *eaddrp;
{

	bcopy(identity_prom.idp_etheraddr, eaddrp, 6);
}