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idprom.c revision 1.2 
      1 /*	$NetBSD: idprom.c,v 1.2 2002/09/27 15:36:57 provos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 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/types.h>
     44 #include <machine/idprom.h>
     45 #include <machine/mon.h>
     46 
     47 #include "libsa.h"
     48 
     49 /*
     50  * This driver provides a soft copy of the IDPROM.
     51  * It is copied from the device early in startup.
     52  * Allow these to be patched (helps with poor old
     53  * Sun3/80 boxes with dead NVRAM).
     54  */
     55 u_char cpu_machine_id = 0;
     56 struct idprom identity_prom = { 0 };
     57 
     58 int idprom_cksum __P((u_char *));
     59 void idprom_init2 __P((void));
     60 void idprom_init3 __P((void));
     61 void idprom_init3x __P((void));
     62 
     63 int
     64 idprom_cksum(p)
     65 	u_char *p;
     66 {
     67 	int len, x;
     68 
     69 	len = IDPROM_CKSUM_SIZE;
     70 	x = 0;	/* xor of data */
     71 	do x ^= *p++;
     72 	while (--len > 0);
     73 	return (x);
     74 }
     75 
     76 /* Copy the ethernet address into the passed space. */
     77 void
     78 idprom_etheraddr(eaddrp)
     79 	u_char *eaddrp;
     80 {
     81 
     82 	idprom_init();
     83 	bcopy(identity_prom.idp_etheraddr, eaddrp, 6);
     84 }
     85 
     86 /* Fetch a copy of the idprom. */
     87 void
     88 idprom_init()
     89 {
     90 
     91 	if (identity_prom.idp_format == 1)
     92 		return;
     93 
     94 	/* Copy the IDPROM contents and do the checksum. */
     95 	if (_is3x)
     96 		idprom_init3x();
     97 	else if (_is2)
     98 		idprom_init2();
     99 	else
    100 		idprom_init3();
    101 
    102 	if (identity_prom.idp_format != 1)
    103 		panic("idprom: bad version");
    104 	cpu_machine_id = identity_prom.idp_machtype;
    105 }
    106 
    107 /*
    108  * Sun2 version:
    109  * Just copy it from control space.
    110  */
    111 void
    112 idprom_init2()
    113 {
    114 
    115 	/* Copy the IDPROM contents and do the checksum. */
    116 	sun2_getidprom((u_char *) &identity_prom);
    117 	if (idprom_cksum((u_char *) &identity_prom))
    118 		printf("idprom: bad checksum\n");
    119 }
    120 
    121 /*
    122  * Sun3 version:
    123  * Just copy it from control space.
    124  */
    125 void
    126 idprom_init3()
    127 {
    128 
    129 	/* Copy the IDPROM contents and do the checksum. */
    130 	sun3_getidprom((u_char *) &identity_prom);
    131 	if (idprom_cksum((u_char *) &identity_prom))
    132 		printf("idprom: bad checksum\n");
    133 }
    134 
    135 /*
    136  * Sun3X version:
    137  * Rather than do all the map-in/probe work to find the idprom,
    138  * we can cheat!  We _know_ the monitor already made a copy of
    139  * the IDPROM in its data page.  All we have to do is find it.
    140  *
    141  * Yeah, this is sorta gross...  Only used on old PROMs that
    142  * do not have a sif_macaddr function (rev < 3.0).  The area
    143  * to search was determined from some "insider" info. about
    144  * the layout of the PROM data area.
    145  */
    146 void
    147 idprom_init3x()
    148 {
    149 	u_char *p;
    150 
    151 	printf("idprom: Sun3X search for soft copy...\n");
    152 
    153 	for (p = (u_char *)(SUN3X_MONDATA + 0x0400);
    154 	     p < (u_char *)(SUN3X_MONDATA + 0x1c00); p++)
    155 	{
    156 		/* first check for some constants */
    157 		if (p[0] != 0x01) /* format */
    158 			continue;
    159 		if (p[2] != 0x08) /* ether[0] */
    160 			continue;
    161 		if (p[3] != 0x00) /* ether[1] */
    162 			continue;
    163 		if (p[4] != 0x20) /* ether[2] */
    164 			continue;
    165 		if ((p[1] & 0xfc) != IDM_ARCH_SUN3X)
    166 			continue;
    167 		/* Looks plausible.  Try the checksum. */
    168 		if (idprom_cksum(p) == 0)
    169 			goto found;
    170 	}
    171 	panic("idprom: not found in monitor data");
    172 
    173 found:
    174 	printf("idprom: copy found at 0x%x\n", (int)p);
    175 	bcopy(p, &identity_prom, sizeof(struct idprom));
    176 }
    177