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  * $FreeBSD: src/sys/boot/common/devopen.c,v 1.4 2003/08/25 23:30:41 obrien Exp $
  27  * $DragonFly: src/sys/boot/common/devopen.c,v 1.3 2003/11/10 06:08:31 dillon Exp $
  28  */
  29
  30 #include <stand.h>
  31 #include <string.h>
  32
  33 #include "bootstrap.h"
  34
  35 /*
  36  * Install f_dev and f_devinfo.  Some devices uses the generic
  37  * devdesc, others will replace it with their own and clear F_DEVDESC.
  38  */
  39 int
  40 devopen(struct open_file *f, const char *fname, const char **file)
  41 {
  42     struct devdesc      *dev;
  43     int                 result;
  44
  45     if ((result = archsw.arch_getdev((void *)&dev, fname, file)) == 0) {        /* get the device */
  46         /* point to device-specific data so that device open can use it */
  47         f->f_flags |= F_DEVDESC;
  48         f->f_devdata = dev;
  49         if ((result = dev->d_dev->dv_open(f, dev)) == 0) {              /* try to open it */
  50             /* reference the devsw entry from the open_file structure */
  51             f->f_dev = dev->d_dev;
  52         } else {
  53             devclose(f);
  54         }
  55     }
  56     return(result);
  57 }
  58
  59 int
  60 devclose(struct open_file *f)
  61 {
  62     if (f->f_flags & F_DEVDESC) {
  63             if (f->f_devdata != NULL) {
  64                 free(f->f_devdata);
  65                 f->f_devdata = NULL;
  66             }
  67             f->f_flags &= ~F_DEVDESC;
  68     }
  69     return(0);
  70 }
  71
  72 void
  73 devreplace(struct open_file *f, void *devdata)
  74 {
  75     if (f->f_flags & F_DEVDESC) {
  76         free(f->f_devdata);
  77         f->f_flags &= ~F_DEVDESC;
  78     }
  79     f->f_devdata = devdata;
  80 }