1/* $NetBSD: booted_dev.c,v 1.4 2016/10/13 16:18:20 flxd 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
39long	booted_dev_fd;
40#if defined(PRIMARY_BOOTBLOCK) || defined(UNIFIED_BOOTBLOCK)
41char	booted_dev_name[BOOTED_DEV_MAXNAMELEN];
42#endif /* defined(PRIMARY_BOOTBLOCK) || defined(UNIFIED_BOOTBLOCK) */
43
44#if defined(PRIMARY_BOOTBLOCK) || defined(UNIFIED_BOOTBLOCK)
45int
46booted_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	devlen = prom_getenv(PROM_E_BOOTED_DEV, booted_dev_name,
57	    sizeof(booted_dev_name));
58
59	ret.bits = prom_open(booted_dev_name, devlen);
60
61	if (ret.u.status)
62		return 0;
63	booted_dev_fd = ret.u.retval;
64
65	return 1;
66}
67#endif
68