usr/src/psm/promif/ieee1275/sun4/prom_vername.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 #include <sys/promif.h>
  30 #include <sys/promimpl.h>
  31
  32 /*
  33  * Return a character string in buf,buflen representing the running
  34  * version of the firmware. Systems that have no concept of such a
  35  * string may return the string "unknown".
  36  *
  37  * Return the actual length of the string, including the NULL terminator.
  38  * Copy at most buflen bytes into the caller's buffer, always providing
  39  * NULL termination.
  40  *
  41  * Returns the actual length of the string, plus copies data in the callers
  42  * buf copying at most buflen bytes.  Returns -1 if an internal error occurs.
  43  */
  44
  45 int
  46 prom_version_name(char *buf, int buflen)
  47 {
  48         pnode_t nodeid;
  49         int proplen;
  50         char *unknown = "unknown";
  51
  52         *buf = *(buf + buflen - 1) = '\0';      /* Force NULL termination */
  53
  54         /*
  55          * On sun4u systems, the /openprom "version" property
  56          * contains the running version of the prom. Some older
  57          * pre-FCS proms may not have the "version" property, so
  58          * in that case we just return "unknown".
  59          */
  60
  61         nodeid = prom_finddevice("/openprom");
  62         if (nodeid == (pnode_t)-1)
  63                 return (-1);
  64
  65         proplen = prom_bounded_getprop(nodeid, "version", buf, buflen - 1);
  66         if (proplen <= 0) {
  67                 (void) prom_strncpy(buf, unknown, buflen - 1);
  68                 return (prom_strlen(unknown) + 1);
  69         }
  70
  71         return (proplen);
  72 }