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idprom.c revision 1.10 
      1 /*	$NetBSD: idprom.c,v 1.10 2003/07/15 03:36:20 lukem 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/cdefs.h>
     44 __KERNEL_RCSID(0, "$NetBSD: idprom.c,v 1.10 2003/07/15 03:36:20 lukem Exp $");
     45 
     46 #include <sys/param.h>
     47 #include <sys/systm.h>
     48 #include <sys/device.h>
     49 #include <sys/kernel.h>
     50 
     51 #include <machine/autoconf.h>
     52 #include <machine/idprom.h>
     53 
     54 #include <sun3/sun3/machdep.h>
     55 #ifdef _SUN3_
     56 #include <sun3/sun3/control.h>
     57 #elif _SUN3X_
     58 #include <sun3/sun3x/obio.h>
     59 #endif
     60 
     61 /*
     62  * This structure is what this driver is all about.
     63  * It is copied from the device early in startup.
     64  */
     65 struct idprom identity_prom;
     66 
     67 static int idprom_cksum __P((u_char *));
     68 static void idprom_get __P((u_char *));
     69 static int idprom_hostid __P((void));
     70 
     71 /*
     72  * Copy the IDPROM contents,
     73  * verify the checksum,
     74  * set the hostid...
     75  */
     76 void
     77 idprom_init()
     78 {
     79 
     80 	idprom_get((u_char *)&identity_prom);
     81 	if (idprom_cksum((u_char *) &identity_prom))
     82 		printf("idprom: bad checksum\n");
     83 	if (identity_prom.idp_format < 1)
     84 		printf("idprom: bad version\n");
     85 
     86 	cpu_machine_id = identity_prom.idp_machtype;
     87 	hostid = idprom_hostid();
     88 }
     89 
     90 static int
     91 idprom_cksum(p)
     92 	u_char *p;
     93 {
     94 	int len, x;
     95 
     96 	len = IDPROM_CKSUM_SIZE;
     97 	x = 0;	/* xor of data */
     98 	do x ^= *p++;
     99 	while (--len > 0);
    100 	return (x);
    101 }
    102 
    103 static int
    104 idprom_hostid()
    105 {
    106 	struct idprom *idp;
    107 	union {
    108 		long l;
    109 		char c[4];
    110 	} hid;
    111 
    112 	/*
    113 	 * Construct the hostid from the idprom contents.
    114 	 * This appears to be the way SunOS does it.
    115 	 */
    116 	idp = &identity_prom;
    117 	hid.c[0] = idp->idp_machtype;
    118 	hid.c[1] = idp->idp_serialnum[0];
    119 	hid.c[2] = idp->idp_serialnum[1];
    120 	hid.c[3] = idp->idp_serialnum[2];
    121 	return (hid.l);
    122 }
    123 
    124 void
    125 idprom_etheraddr(eaddrp)
    126 	u_char *eaddrp;
    127 {
    128 
    129 	memcpy(eaddrp, identity_prom.idp_etheraddr, 6);
    130 }
    131 
    132 /*
    133  * Machine specific stuff follows.
    134  */
    135 
    136 #ifdef _SUN3_
    137 #error "not yet merged"
    138 #endif /* SUN3 */
    139 #ifdef _SUN3X_
    140 /*
    141  * On the Sun3X, this is called early during startup,
    142  * but after trap table setup so peek_byte() works.
    143  * Called by machdep.c:identifycpu()
    144  */
    145 static void
    146 idprom_get(dst)
    147 	u_char *dst;
    148 {
    149 	u_char *src;
    150 	caddr_t va;
    151 	int len;
    152 
    153 	/* First, probe for a separate IDPROM (3/470). */
    154 	va = obio_find_mapping(OBIO_IDPROM1, IDPROM_SIZE);
    155 	if (peek_byte(va) == -1) {
    156 		/* IDPROM is in the EEPROM */
    157 		va = obio_find_mapping(OBIO_IDPROM2, IDPROM_SIZE);
    158 	}
    159 
    160 	/* Copy the IDPROM contents and do the checksum. */
    161 	src = (u_char *) va;
    162 	len = IDPROM_SIZE;
    163 	do {
    164 		*dst++ = *src++;
    165 	} while (--len > 0);
    166 }
    167 
    168 #endif /* SUN3X */
    169