sys/arch/sun68k/stand/libsa/idprom.c

   1 /*      $NetBSD: idprom.c,v 1.5 2008/04/28 20:23:39 martin 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  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * Machine ID PROM - system type and serial number
  34  */
  35
  36 #include <sys/types.h>
  37 #include <machine/idprom.h>
  38 #include <machine/mon.h>
  39 #include <lib/libsa/stand.h>
  40
  41 #include "libsa.h"
  42
  43 /*
  44  * This driver provides a soft copy of the IDPROM.
  45  * It is copied from the device early in startup.
  46  * Allow these to be patched (helps with poor old
  47  * Sun3/80 boxes with dead NVRAM).
  48  */
  49 u_char cpu_machine_id = 0;
  50 struct idprom identity_prom = { 0 };
  51
  52 int idprom_cksum(u_char *);
  53 void idprom_init2(void);
  54 void idprom_init3(void);
  55 void idprom_init3x(void);
  56
  57 int
  58 idprom_cksum(u_char *p)
  59 {
  60         int len, x;
  61
  62         len = IDPROM_CKSUM_SIZE;
  63         x = 0;  /* xor of data */
  64         do x ^= *p++;
  65         while (--len > 0);
  66         return (x);
  67 }
  68
  69 /* Copy the ethernet address into the passed space. */
  70 void
  71 idprom_etheraddr(u_char *eaddrp)
  72 {
  73
  74         idprom_init();
  75         memcpy(eaddrp, identity_prom.idp_etheraddr, 6);
  76 }
  77
  78 /* Fetch a copy of the idprom. */
  79 void
  80 idprom_init(void)
  81 {
  82
  83         if (identity_prom.idp_format == 1)
  84                 return;
  85
  86         /* Copy the IDPROM contents and do the checksum. */
  87         if (_is3x)
  88                 idprom_init3x();
  89         else if (_is2)
  90                 idprom_init2();
  91         else
  92                 idprom_init3();
  93
  94         if (identity_prom.idp_format != 1)
  95                 panic("idprom: bad version");
  96         cpu_machine_id = identity_prom.idp_machtype;
  97 }
  98
  99 /*
 100  * Sun2 version:
 101  * Just copy it from control space.
 102  */
 103 void
 104 idprom_init2(void)
 105 {
 106
 107         /* Copy the IDPROM contents and do the checksum. */
 108         sun2_getidprom((u_char *) &identity_prom);
 109         if (idprom_cksum((u_char *) &identity_prom))
 110                 printf("idprom: bad checksum\n");
 111 }
 112
 113 /*
 114  * Sun3 version:
 115  * Just copy it from control space.
 116  */
 117 void
 118 idprom_init3(void)
 119 {
 120
 121         /* Copy the IDPROM contents and do the checksum. */
 122         sun3_getidprom((u_char *) &identity_prom);
 123         if (idprom_cksum((u_char *) &identity_prom))
 124                 printf("idprom: bad checksum\n");
 125 }
 126
 127 /*
 128  * Sun3X version:
 129  * Rather than do all the map-in/probe work to find the idprom,
 130  * we can cheat!  We _know_ the monitor already made a copy of
 131  * the IDPROM in its data page.  All we have to do is find it.
 132  *
 133  * Yeah, this is sorta gross...  Only used on old PROMs that
 134  * do not have a sif_macaddr function (rev < 3.0).  The area
 135  * to search was determined from some "insider" info. about
 136  * the layout of the PROM data area.
 137  */
 138 void
 139 idprom_init3x(void)
 140 {
 141         u_char *p;
 142
 143         printf("idprom: Sun3X search for soft copy...\n");
 144
 145         for (p = (u_char *)(SUN3X_MONDATA + 0x0400);
 146              p < (u_char *)(SUN3X_MONDATA + 0x1c00); p++)
 147         {
 148                 /* first check for some constants */
 149                 if (p[0] != 0x01) /* format */
 150                         continue;
 151                 if (p[2] != 0x08) /* ether[0] */
 152                         continue;
 153                 if (p[3] != 0x00) /* ether[1] */
 154                         continue;
 155                 if (p[4] != 0x20) /* ether[2] */
 156                         continue;
 157                 if ((p[1] & 0xfc) != IDM_ARCH_SUN3X)
 158                         continue;
 159                 /* Looks plausible.  Try the checksum. */
 160                 if (idprom_cksum(p) == 0)
 161                         goto found;
 162         }
 163         panic("idprom: not found in monitor data");
 164
 165 found:
 166         printf("idprom: copy found at 0x%x\n", (int)p);
 167         memcpy(&identity_prom, p, sizeof(struct idprom));
 168 }