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idprom.c revision 1.4 
      1 /*	$NetBSD: idprom.c,v 1.4 1997/04/28 23:43:56 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 static u_long idprom_pa;
     60 
     61 static int  idprom_match __P((struct device *, struct cfdata *, void *));
     62 static void idprom_attach __P((struct device *, struct device *, void *));
     63 
     64 struct cfattach idprom_ca = {
     65 	sizeof(struct device), idprom_match, idprom_attach
     66 };
     67 
     68 struct cfdriver idprom_cd = {
     69 	NULL, "idprom", DV_DULL
     70 };
     71 
     72 /*
     73  * Find the IDPROM and copy it to memory.
     74  * This is called early during startup,
     75  * but late enough so peek_byte() works.
     76  * Called by machdep.c:identifycpu()
     77  */
     78 void
     79 idprom_init()
     80 {
     81 	struct idprom *idp;
     82 	u_char *src, *dst;
     83 	caddr_t va;
     84 	u_long pa;
     85 	int len, x, xorsum;
     86 	union {
     87 		long l;
     88 		char c[4];
     89 	} hid;
     90 
     91 	/* First, probe for a separate IDPROM (3/470). */
     92 	pa = OBIO_IDPROM1;
     93 	va = obio_find_mapping(pa, IDPROM_SIZE);
     94 	if (peek_byte(va) == -1) {
     95 		/* IDPROM is in the EEPROM */
     96 		pa = OBIO_IDPROM2;
     97 		va = obio_find_mapping(pa, IDPROM_SIZE);
     98 	}
     99 
    100 	/* Save the phys. address for idprom_match. */
    101 	idprom_pa = pa;
    102 
    103 	/* Copy the IDPROM contents and do the checksum. */
    104 	idp = &identity_prom;
    105 	dst = (u_char *) idp;
    106 	src = (u_char *) va;
    107 	len = IDPROM_SIZE;
    108 	xorsum = 0;	/* calculated as xor of data */
    109 
    110 	do {
    111 		x = *src++;
    112 		*dst++ = x;
    113 		xorsum ^= x;
    114 	} while (--len > 0);
    115 
    116 	if (xorsum != 0)
    117 		printf("idprom: bad checksum=%d\n", xorsum);
    118 	if (idp->idp_format < 1)
    119 		printf("idprom: bad version=%d\n", idp->idp_format);
    120 
    121 	/*
    122 	 * Construct the hostid from the idprom contents.
    123 	 * This appears to be the way SunOS does it.
    124 	 */
    125 	hid.c[0] = idp->idp_machtype;
    126 	hid.c[1] = idp->idp_serialnum[0];
    127 	hid.c[2] = idp->idp_serialnum[1];
    128 	hid.c[3] = idp->idp_serialnum[2];
    129 	hostid = hid.l;
    130 }
    131 
    132 static int
    133 idprom_match(parent, cf, args)
    134     struct device *parent;
    135 	struct cfdata *cf;
    136     void *args;
    137 {
    138 	struct confargs *ca = args;
    139 
    140 	/* This driver only supports one unit. */
    141 	if (cf->cf_unit != 0)
    142 		return (0);
    143 
    144 	/* Match the address we determined earlier. */
    145 	if (ca->ca_paddr != idprom_pa)
    146 		return (0);
    147 
    148 	return (1);
    149 }
    150 
    151 static void
    152 idprom_attach(parent, self, args)
    153 	struct device *parent;
    154 	struct device *self;
    155 	void *args;
    156 {
    157 
    158 	printf("\n");
    159 }
    160 
    161 void
    162 idprom_etheraddr(eaddrp)
    163 	u_char *eaddrp;
    164 {
    165 	u_char *src, *dst;
    166 	int len = 6;
    167 
    168 	src = identity_prom.idp_etheraddr;
    169 	dst = eaddrp;
    170 
    171 	do *dst++ = *src++;
    172 	while (--len > 0);
    173 }
    174