usr/src/boot/sys/boot/common/devopen.c

   1 /*-
   2  * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <stand.h>
  31 #include <string.h>
  32
  33 #include "bootstrap.h"
  34
  35 int
  36 devopen(struct open_file *f, const char *fname, const char **file)
  37 {
  38         struct devdesc *dev;
  39         int result;
  40
  41         result = archsw.arch_getdev((void **)&dev, fname, file);
  42         if (result)
  43                 return (result);
  44
  45         /* point to device-specific data so that device open can use it */
  46         f->f_devdata = dev;
  47         result = dev->d_dev->dv_open(f, dev);
  48         if (result != 0) {
  49                 f->f_devdata = NULL;
  50                 free(dev);
  51                 return (result);
  52         }
  53
  54         /* reference the devsw entry from the open_file structure */
  55         f->f_dev = dev->d_dev;
  56         return (0);
  57 }
  58
  59 int
  60 devclose(struct open_file *f)
  61 {
  62
  63         if (f->f_devdata != NULL) {
  64                 free(f->f_devdata);
  65         }
  66         return (0);
  67 }