devopen.c revision 1.2 
1/*	$NetBSD: devopen.c,v 1.2 2006/04/22 07:58:53 cherry Exp $	*/
2
3/*-
4 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30/* __FBSDID("$FreeBSD: src/sys/boot/common/devopen.c,v 1.4 2003/08/25 23:30:41 obrien Exp $"); */
31
32#include <lib/libsa/stand.h>
33
34#include "bootstrap.h"
35
36int
37devopen(struct open_file *f, const char *fname, char **file)
38{
39    struct devdesc	*dev;
40    int			result;
41
42    if ((result = archsw.arch_getdev((void *)&dev, fname, (const char **) file)) == 0) {	/* get the device */
43	/* point to device-specific data so that device open can use it */
44	f->f_devdata = dev;
45	if ((result = dev->d_dev->dv_open(f, dev)) == 0) { 		/* try to open it */
46	    /* reference the devsw entry from the open_file structure */
47	    f->f_dev = dev->d_dev;
48	} else {
49	    free(dev);		/* release the device descriptor */
50	}
51    }
52    return(result);
53}
54
55int
56devclose(struct open_file *f)
57{
58    if (f->f_devdata != NULL) {
59	free(f->f_devdata);
60    }
61    return(0);
62}
63