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idprom.c revision 1.5 
      1 /*	$NetBSD: idprom.c,v 1.5 1997/10/16 15:56:02 gwr Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Adam Glass and Gordon W. Ross.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * Machine ID PROM - system type and serial number
     41  */
     42 
     43 #include <sys/param.h>
     44 #include <sys/systm.h>
     45 #include <sys/device.h>
     46 #include <sys/kernel.h>
     47 
     48 #include <machine/autoconf.h>
     49 #include <machine/idprom.h>
     50 #include <machine/obio.h>
     51 #include <machine/machdep.h>
     52 #include <machine/mon.h>
     53 
     54 /*
     55  * This structure is what this driver is all about.
     56  * It is copied from the device early in startup.
     57  */
     58 struct idprom identity_prom;
     59 
     60 static int idprom_hostid __P((void));
     61 
     62 /*
     63  * Find the IDPROM and copy it to memory.
     64  * This is called early during startup,
     65  * but late enough so peek_byte() works.
     66  * Called by machdep.c:identifycpu()
     67  */
     68 void
     69 idprom_init()
     70 {
     71 	u_char *src, *dst;
     72 	caddr_t va;
     73 	int len, x, xorsum;
     74 
     75 	/* First, probe for a separate IDPROM (3/470). */
     76 	va = obio_find_mapping(OBIO_IDPROM1, IDPROM_SIZE);
     77 	if (peek_byte(va) == -1) {
     78 		/* IDPROM is in the EEPROM */
     79 		va = obio_find_mapping(OBIO_IDPROM2, IDPROM_SIZE);
     80 	}
     81 
     82 	/* Copy the IDPROM contents and do the checksum. */
     83 	dst = (u_char *) &identity_prom;
     84 	src = (u_char *) va;
     85 	len = IDPROM_SIZE;
     86 	xorsum = 0;	/* calculated as xor of data */
     87 
     88 	do {
     89 		x = *src++;
     90 		*dst++ = x;
     91 		xorsum ^= x;
     92 	} while (--len > 0);
     93 
     94 	if (xorsum != 0)
     95 		printf("idprom: bad checksum\n");
     96 	if (identity_prom.idp_format < 1)
     97 		printf("idprom: bad version\n");
     98 
     99 	hostid = idprom_hostid();
    100 }
    101 
    102 static int
    103 idprom_hostid()
    104 {
    105 	struct idprom *idp;
    106 	union {
    107 		long l;
    108 		char c[4];
    109 	} hid;
    110 
    111 	/*
    112 	 * Construct the hostid from the idprom contents.
    113 	 * This appears to be the way SunOS does it.
    114 	 */
    115 	idp = &identity_prom;
    116 	hid.c[0] = idp->idp_machtype;
    117 	hid.c[1] = idp->idp_serialnum[0];
    118 	hid.c[2] = idp->idp_serialnum[1];
    119 	hid.c[3] = idp->idp_serialnum[2];
    120 	return (hid.l);
    121 }
    122 
    123 void
    124 idprom_etheraddr(eaddrp)
    125 	u_char *eaddrp;
    126 {
    127 
    128 	bcopy(identity_prom.idp_etheraddr, eaddrp, 6);
    129 }
    130