sys/arch/alpha/stand/common/booted_dev.c

   1 /* $NetBSD: booted_dev.c,v 1.1 1999/04/02 03:19:08 cgd Exp $ */
   2
   3 /*
   4  * Copyright (c) 1999 Christopher G. Demetriou.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by Christopher G. Demetriou
  17  *      for the NetBSD Project.
  18  * 4. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <lib/libsa/stand.h>
  34 #include <lib/libkern/libkern.h>
  35
  36 #include <machine/prom.h>
  37 #include "common.h"
  38
  39 long    booted_dev_fd;
  40 #if defined(PRIMARY_BOOTBLOCK) || defined(UNIFIED_BOOTBLOCK)
  41 char    booted_dev_name[BOOTED_DEV_MAXNAMELEN];
  42 #endif /* defined(PRIMARY_BOOTBLOCK) || defined(UNIFIED_BOOTBLOCK) */
  43
  44 #if defined(PRIMARY_BOOTBLOCK) || defined(UNIFIED_BOOTBLOCK)
  45 int
  46 booted_dev_open(void)
  47 {
  48         prom_return_t ret;
  49         int devlen;
  50
  51         /*
  52          * XXX
  53          * We don't know what device names look like yet,
  54          * so we can't change them.
  55          */
  56         ret.bits = prom_getenv(PROM_E_BOOTED_DEV, booted_dev_name,
  57             sizeof(booted_dev_name));
  58         devlen = ret.u.retval;
  59
  60         ret.bits = prom_open(booted_dev_name, devlen);
  61
  62         if (ret.u.status)
  63                 return 0;
  64         booted_dev_fd = ret.u.retval;
  65
  66         return 1;
  67 }
  68 #endif