sys/arch/i386/stand/lib/test/biosdisk_user.c

   1 /*      $NetBSD: biosdisk_user.c,v 1.7 2008/12/14 18:46:33 christos Exp $       */
   2
   3 /*
   4  * Copyright (c) 1998
   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 "sanamespace.h"
  30
  31 #include <stdio.h>
  32 #include <unistd.h>
  33 #include <fcntl.h>
  34 #include <err.h>
  35
  36 #include "biosdisk_ll.h"
  37 #include "biosdisk_user.h"
  38
  39 /*
  40  * Replacement for i386/stand/lib/bios_disk.S.
  41  * Allows to map BIOS-like device numbers to character
  42  * device nodes or plain files.
  43  * The actual mapping is defined in the external table
  44  * "emuldisktab".
  45  */
  46
  47 static int currentdev, currentdte;
  48 static int fd = -1;
  49
  50 int
  51 get_diskinfo(int dev)
  52 {
  53         int i, retval;
  54
  55         if (fd != -1) {
  56                 close(fd);
  57                 fd = -1;
  58         }
  59
  60         i = 0;
  61         for (;;) {
  62                 if (emuldisktab[i].biosdev == -1)
  63                         break;
  64                 if (emuldisktab[i].biosdev == dev)
  65                         goto ok;
  66                 i++;
  67         }
  68         warnx("unknown device %x", dev);
  69         return 0; /* triggers error in set_geometry() */
  70
  71 ok:
  72         fd = open(emuldisktab[i].name, O_RDONLY, 0);
  73         if (fd < 0) {
  74                 warn("open %s", emuldisktab[i].name);
  75                 return 0;
  76         }
  77
  78         currentdev = dev;
  79         currentdte = i;
  80
  81         retval = ((emuldisktab[i].cyls - 1) & 0xff) << 16;
  82         retval |= ((emuldisktab[i].cyls - 1) & 0x300) << 6;
  83         retval |= emuldisktab[i].spt << 8;
  84         retval |= emuldisktab[i].heads - 1;
  85         return retval;
  86 }
  87
  88 int
  89 biosread(int dev, int cyl, int head, int sec, int nsec, char *buf)
  90 {
  91
  92         if (dev != currentdev) {
  93                 warnx("biosread: unexpected device %x", dev);
  94                 return -1;
  95         }
  96
  97         if (lseek(fd, ((cyl * emuldisktab[currentdte].heads + head)
  98                        * emuldisktab[currentdte].spt + sec) * 512,
  99                   SEEK_SET) == -1) {
 100                 warn("lseek");
 101                 return -1;
 102         }
 103         if (read(fd, buf, nsec * 512) != nsec * 512) {
 104                 warn("read");
 105                 return -1;
 106         }
 107         return 0;
 108 }
 109
 110 int
 111 int13_extension(int dev)
 112 {
 113
 114         return 0;
 115 }
 116
 117 void
 118 int13_getextinfo(int dev, struct biosdisk_ext13info *info)
 119 {
 120 }
 121
 122 struct ext {
 123         int8_t  size;
 124         int8_t  resvd;
 125         int16_t cnt;
 126         int16_t off;
 127         int16_t seg;
 128         int64_t sec;
 129 };
 130
 131 int
 132 biosextread(int dev, struct ext *ext)
 133 {
 134         return -1;
 135 }