idprom.c revision 1.3 
1/*	$NetBSD: idprom.c,v 1.3 2005/01/22 15:36:11 chs 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 */
55u_char cpu_machine_id = 0;
56struct idprom identity_prom = { 0 };
57
58int idprom_cksum(u_char *);
59void idprom_init2(void);
60void idprom_init3(void);
61void idprom_init3x(void);
62
63int
64idprom_cksum(u_char *p)
65{
66	int len, x;
67
68	len = IDPROM_CKSUM_SIZE;
69	x = 0;	/* xor of data */
70	do x ^= *p++;
71	while (--len > 0);
72	return (x);
73}
74
75/* Copy the ethernet address into the passed space. */
76void
77idprom_etheraddr(u_char *eaddrp)
78{
79
80	idprom_init();
81	memcpy(eaddrp, identity_prom.idp_etheraddr, 6);
82}
83
84/* Fetch a copy of the idprom. */
85void
86idprom_init(void)
87{
88
89	if (identity_prom.idp_format == 1)
90		return;
91
92	/* Copy the IDPROM contents and do the checksum. */
93	if (_is3x)
94		idprom_init3x();
95	else if (_is2)
96		idprom_init2();
97	else
98		idprom_init3();
99
100	if (identity_prom.idp_format != 1)
101		panic("idprom: bad version");
102	cpu_machine_id = identity_prom.idp_machtype;
103}
104
105/*
106 * Sun2 version:
107 * Just copy it from control space.
108 */
109void
110idprom_init2(void)
111{
112
113	/* Copy the IDPROM contents and do the checksum. */
114	sun2_getidprom((u_char *) &identity_prom);
115	if (idprom_cksum((u_char *) &identity_prom))
116		printf("idprom: bad checksum\n");
117}
118
119/*
120 * Sun3 version:
121 * Just copy it from control space.
122 */
123void
124idprom_init3(void)
125{
126
127	/* Copy the IDPROM contents and do the checksum. */
128	sun3_getidprom((u_char *) &identity_prom);
129	if (idprom_cksum((u_char *) &identity_prom))
130		printf("idprom: bad checksum\n");
131}
132
133/*
134 * Sun3X version:
135 * Rather than do all the map-in/probe work to find the idprom,
136 * we can cheat!  We _know_ the monitor already made a copy of
137 * the IDPROM in its data page.  All we have to do is find it.
138 *
139 * Yeah, this is sorta gross...  Only used on old PROMs that
140 * do not have a sif_macaddr function (rev < 3.0).  The area
141 * to search was determined from some "insider" info. about
142 * the layout of the PROM data area.
143 */
144void
145idprom_init3x(void)
146{
147	u_char *p;
148
149	printf("idprom: Sun3X search for soft copy...\n");
150
151	for (p = (u_char *)(SUN3X_MONDATA + 0x0400);
152	     p < (u_char *)(SUN3X_MONDATA + 0x1c00); p++)
153	{
154		/* first check for some constants */
155		if (p[0] != 0x01) /* format */
156			continue;
157		if (p[2] != 0x08) /* ether[0] */
158			continue;
159		if (p[3] != 0x00) /* ether[1] */
160			continue;
161		if (p[4] != 0x20) /* ether[2] */
162			continue;
163		if ((p[1] & 0xfc) != IDM_ARCH_SUN3X)
164			continue;
165		/* Looks plausible.  Try the checksum. */
166		if (idprom_cksum(p) == 0)
167			goto found;
168	}
169	panic("idprom: not found in monitor data");
170
171found:
172	printf("idprom: copy found at 0x%x\n", (int)p);
173	memcpy(&identity_prom, p, sizeof(struct idprom));
174}
175