sys/arch/i386/stand/dosboot/devopen.c

   1 /*      $NetBSD: devopen.c,v 1.10 2005/12/11 12:17:48 christos Exp $     */
   2
   3 /*
   4  * Copyright (c) 1996
   5  *      Matthias Drochner.  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 ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28
  29 #include <lib/libsa/stand.h>
  30 #include <lib/libkern/libkern.h>
  31 #include <lib/libsa/ufs.h>
  32
  33 #include <libi386.h>
  34 #include <biosdisk.h>
  35 #include <dosfile.h>
  36 #include <bootinfo.h>
  37
  38 struct devsw devsw[] = {
  39         {"disk", biosdisk_strategy, biosdisk_open, biosdisk_close, biosdisk_ioctl},
  40 };
  41 int ndevs = sizeof(devsw) / sizeof(struct devsw);
  42
  43 static struct fs_ops dosfs = {
  44         dos_open, dos_close, dos_read, dos_write, dos_seek, dos_stat
  45 };
  46 static struct fs_ops ufsfs = {
  47         ufs_open, ufs_close, ufs_read, ufs_write, ufs_seek, ufs_stat
  48 };
  49
  50 struct fs_ops   file_system[] = {
  51         {0},
  52 };
  53 int  nfsys = 1;
  54
  55 static struct {
  56         char           *name;
  57         int             biosdev;
  58 }               biosdevtab[] = {
  59         {
  60                 "fd", 0
  61         },
  62         {
  63                 "wd", 0x80
  64         },
  65         {
  66                 "sd", 0x80
  67         },
  68         {
  69                 "hd", 0x80
  70         }
  71 };
  72 #define NUMBIOSDEVS (sizeof(biosdevtab) / sizeof(biosdevtab[0]))
  73
  74 static int dev2bios(char *, unsigned int, int *);
  75
  76 static int
  77 dev2bios(char *devname, unsigned int unit, int *biosdev)
  78 {
  79         unsigned             i;
  80
  81         for (i = 0; i < NUMBIOSDEVS; i++)
  82                 if (!strcmp(devname, biosdevtab[i].name)) {
  83                         *biosdev = biosdevtab[i].biosdev + unit;
  84                         if (unit >= 4)  /* ??? */
  85                                 return (EUNIT);
  86                         return (0);
  87                 }
  88         return (ENXIO);
  89 }
  90
  91 struct btinfo_bootpath bibp;
  92
  93 int
  94 devopen(struct open_file *f, const char *fname, char **file)
  95 {
  96         char           *devname;
  97         char           *fsmode;
  98         int             unit, partition;
  99         int             biosdev;
 100         int             error;
 101         struct devsw   *dp;
 102
 103         if ((error = parsebootfile(fname, &fsmode, &devname, &unit,
 104             &partition, (const char **) file)))
 105                 return (error);
 106
 107         if (!strcmp(fsmode, "dos")) {
 108                 file_system[0] = dosfs; /* structure assignment! */
 109                 f->f_flags |= F_NODEV;  /* handled by DOS */
 110                 return (0);
 111         } else if (!strcmp(fsmode, "ufs")) {
 112                 if ((error = dev2bios(devname, unit, &biosdev)))
 113                         return (error);
 114                 file_system[0] = ufsfs; /* structure assignment! */
 115                 dp = &devsw[0]; /* must be biosdisk */
 116                 f->f_dev = dp;
 117
 118                 strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
 119                 BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
 120
 121                 return (biosdisk_open(f, biosdev, partition));
 122         } else {
 123                 printf("no file system\n");
 124                 return (ENXIO);
 125         }
 126         /* NOTREACHED */
 127 }