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idprom.c revision 1.2 
      1 /*	$NetBSD: idprom.c,v 1.2 1997/01/27 22:16:37 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 char *idprom_va;
     60 
     61 /*
     62  * This is called very early during startup to
     63  * get a copy of the idprom from control space.
     64  */
     65 void
     66 idprom_init()
     67 {
     68 	struct idprom *idp;
     69 	char *src, *dst;
     70 	int len, x, xorsum;
     71 	union {
     72 		long l;
     73 		char c[4];
     74 	} hid;
     75 
     76 	idprom_va = obio_find_mapping(OBIO_IDPROM2, sizeof(struct idprom));
     77 
     78 	idp = &identity_prom;
     79 	dst = (char*)idp;
     80 	src = (char*)idprom_va;
     81 	len = IDPROM_SIZE;
     82 	xorsum = 0;	/* calculated as xor of data */
     83 
     84 	do {
     85 		x = *src++;
     86 		*dst++ = x;
     87 		xorsum ^= x;
     88 	} while (--len > 0);
     89 
     90 	if (xorsum != 0) {
     91 		mon_printf("idprom_fetch: bad checksum=%d\n", xorsum);
     92 		sunmon_abort();
     93 	}
     94 	if (idp->idp_format < 1) {
     95 		mon_printf("idprom_fetch: bad version=%d\n", idp->idp_format);
     96 		sunmon_abort();
     97 	}
     98 
     99 	/*
    100 	 * Construct the hostid from the idprom contents.
    101 	 * This appears to be the way SunOS does it.
    102 	 */
    103 	hid.c[0] = idp->idp_machtype;
    104 	hid.c[1] = idp->idp_serialnum[0];
    105 	hid.c[2] = idp->idp_serialnum[1];
    106 	hid.c[3] = idp->idp_serialnum[2];
    107 	hostid = hid.l;
    108 }
    109 
    110 void idprom_etheraddr(eaddrp)
    111 	u_char *eaddrp;
    112 {
    113 	u_char *src, *dst;
    114 	int len = 6;
    115 
    116 	src = identity_prom.idp_etheraddr;
    117 	dst = eaddrp;
    118 
    119 	do *dst++ = *src++;
    120 	while (--len > 0);
    121 }
    122