usr/src/psm/promif/ieee1275/sun4/prom_idprom.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 (c) 1990,1992-1994 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * XXX: Break this up into individual property lookups.
  31  */
  32
  33 #include <sys/promif.h>
  34 #include <sys/promimpl.h>
  35 #include <sys/idprom.h>
  36
  37 /*
  38  * Get idprom property from root node, return to callers buffer.
  39  */
  40
  41 int
  42 prom_getidprom(caddr_t addr, int size)
  43 {
  44         u_char *cp, val = 0;
  45         /*LINTED [idprom unused]*/
  46         idprom_t idprom;
  47         int i;
  48         int length;
  49
  50         length = prom_getproplen(prom_rootnode(), OBP_IDPROM);
  51         if (length == -1)  {
  52                 prom_printf("Missing OBP idprom property.\n");
  53                 return (-1);
  54         }
  55
  56         if (length > size) {
  57                 prom_printf("Buffer size too small.\n");
  58                 return (-1);
  59         }
  60
  61         (void) prom_getprop(prom_rootnode(), OBP_IDPROM,
  62                 (caddr_t) addr);
  63
  64         /*
  65          * Test the checksum for sanity
  66          */
  67         for (cp = (u_char *)addr, i = 0;
  68                         i < (sizeof (idprom) - sizeof (idprom.id_undef)); i++)
  69                 val ^= *cp++;
  70
  71         if (val != 0)
  72                 prom_printf("Warning: IDprom checksum error.\n");
  73
  74         return (0);
  75 }