usr/src/psm/promif/ieee1275/sun4/prom_macaddr.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * Return our machine address in the single argument.
  31  */
  32
  33 #include <sys/promif.h>
  34 #include <sys/promimpl.h>
  35 #include <sys/idprom.h>
  36
  37 /*ARGSUSED*/
  38 int
  39 prom_getmacaddr(ihandle_t hd, caddr_t ea)
  40 {
  41         idprom_t idprom;
  42         pnode_t macnodeid;
  43
  44         /*
  45          * Look for the 'mac-address' property in the device node
  46          * associated with the ihandle 'hd'. This handles the
  47          * cases when we booted from the network device, using either
  48          * the platform mac address or a local mac address. This
  49          * code will always return whichever mac-address was used by the
  50          * firmware (local or platform, depending on nvram settings).
  51          */
  52         macnodeid = prom_getphandle(hd);
  53         if (macnodeid != OBP_BADNODE) {
  54                 if (prom_getproplen(macnodeid, OBP_MAC_ADDR) != -1) {
  55                         (void) prom_getprop(macnodeid, OBP_MAC_ADDR, ea);
  56                         return (0);
  57                 }
  58         }
  59
  60         /*
  61          * The code above, should have taken care of the case
  62          * when we booted from the device ... otherwise, as a fallback
  63          * case, return the system mac address from the idprom.
  64          * This code (idprom) is SMCC (and compatibles) platform-centric.
  65          * This code always returns the platform mac address.
  66          */
  67         if (prom_getidprom((caddr_t)&idprom, sizeof (idprom)) == 0) {
  68                 char *f = (char *)idprom.id_ether;
  69                 char *t = ea;
  70                 int i;
  71
  72                 for (i = 0; i < sizeof (idprom.id_ether); ++i)
  73                         *t++ = *f++;
  74
  75                 return (0);
  76         } else
  77                 return (-1); /* our world must be starting to explode */
  78 }