fs/fdos/dev.c

   1 /*
   2  * (C) Copyright 2002
   3  * Stäubli Faverges - <www.staubli.com>
   4  * Pierre AUBERT  p.aubert@staubli.com
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <common.h>
  26 #include <config.h>
  27
  28 #include "dos.h"
  29 #include "fdos.h"
  30
  31 #if (CONFIG_COMMANDS & CFG_CMD_FDOS)
  32
  33 #define NB_HEADS        2
  34 #define NB_TRACKS       80
  35 #define NB_SECTORS      18
  36
  37
  38 static int lastwhere;
  39
  40 /*-----------------------------------------------------------------------------
  41  * dev_open --
  42  *-----------------------------------------------------------------------------
  43  */
  44 int dev_open (void)
  45 {
  46     lastwhere = 0;
  47     return (0);
  48 }
  49
  50 /*-----------------------------------------------------------------------------
  51  * dev_read -- len and where are sectors number
  52  *-----------------------------------------------------------------------------
  53  */
  54 int dev_read (void *buffer, int where, int len)
  55 {
  56     PRINTF ("dev_read (len = %d, where = %d)\n", len, where);
  57
  58     /* Si on ne desire pas lire a la position courante, il faut un seek      */
  59     if (where != lastwhere) {
  60         if (!fdc_fdos_seek (where)) {
  61             PRINTF ("seek error in dev_read");
  62             lastwhere = -1;
  63             return (-1);
  64         }
  65     }
  66
  67     if (!fdc_fdos_read (buffer, len)) {
  68         PRINTF ("read error\n");
  69         lastwhere = -1;
  70         return (-1);
  71     }
  72     lastwhere = where + len;
  73     return (0);
  74 }
  75 /*-----------------------------------------------------------------------------
  76  * check_dev -- verify the diskette format
  77  *-----------------------------------------------------------------------------
  78  */
  79 int check_dev (BootSector_t *boot, Fs_t *fs)
  80 {
  81     unsigned int heads, sectors, tracks;
  82     int BootP, Infp0, InfpX, InfTm;
  83     int sect_per_track;
  84
  85     /* Display Boot header                                                   */
  86     PRINTF ("Jump to boot code                  0x%02x 0x%02x 0x%02x\n",
  87             boot -> jump [0], boot -> jump [1], boot -> jump[2]);
  88     PRINTF ("OEM name & version                 '%*.*s'\n",
  89             BANNER_LG, BANNER_LG, boot -> banner );
  90     PRINTF ("Bytes per sector hopefully 512     %d\n",
  91             __le16_to_cpu (boot -> secsiz));
  92     PRINTF ("Cluster size in sectors            %d\n",
  93             boot -> clsiz);
  94     PRINTF ("Number of reserved (boot) sectors  %d\n",
  95             __le16_to_cpu (boot -> nrsvsect));
  96     PRINTF ("Number of FAT tables hopefully 2   %d\n",
  97             boot -> nfat);
  98     PRINTF ("Number of directory slots          %d\n",
  99             __le16_to_cpu (boot -> dirents));
 100     PRINTF ("Total sectors on disk              %d\n",
 101             __le16_to_cpu (boot -> psect));
 102     PRINTF ("Media descriptor=first byte of FAT %d\n",
 103             boot -> descr);
 104     PRINTF ("Sectors in FAT                     %d\n",
 105             __le16_to_cpu (boot -> fatlen));
 106     PRINTF ("Sectors/track                      %d\n",
 107             __le16_to_cpu (boot -> nsect));
 108     PRINTF ("Heads                              %d\n",
 109             __le16_to_cpu (boot -> nheads));
 110     PRINTF ("number of hidden sectors           %d\n",
 111             __le32_to_cpu (boot -> nhs));
 112     PRINTF ("big total sectors                  %d\n",
 113             __le32_to_cpu (boot -> bigsect));
 114     PRINTF ("physical drive ?                   %d\n",
 115             boot -> physdrive);
 116     PRINTF ("reserved                           %d\n",
 117             boot -> reserved);
 118     PRINTF ("dos > 4.0 diskette                 %d\n",
 119             boot -> dos4);
 120     PRINTF ("serial number                      %d\n",
 121             __le32_to_cpu (boot -> serial));
 122     PRINTF ("disk label                         %*.*s\n",
 123             LABEL_LG, LABEL_LG, boot -> label);
 124     PRINTF ("FAT type                           %8.8s\n",
 125             boot -> fat_type);
 126     PRINTF ("reserved by 2M                     %d\n",
 127             boot -> res_2m);
 128     PRINTF ("2M checksum (not used)             %d\n",
 129             boot -> CheckSum);
 130     PRINTF ("2MF format version                 %d\n",
 131             boot -> fmt_2mf);
 132     PRINTF ("1 if write track after format      %d\n",
 133             boot -> wt);
 134     PRINTF ("data transfer rate on track 0      %d\n",
 135             boot -> rate_0);
 136     PRINTF ("data transfer rate on track<>0     %d\n",
 137             boot -> rate_any);
 138     PRINTF ("offset to boot program             %d\n",
 139             __le16_to_cpu (boot -> BootP));
 140     PRINTF ("T1: information for track 0        %d\n",
 141             __le16_to_cpu (boot -> Infp0));
 142     PRINTF ("T2: information for track<>0       %d\n",
 143             __le16_to_cpu (boot -> InfpX));
 144     PRINTF ("T3: track sectors size table       %d\n",
 145             __le16_to_cpu (boot -> InfTm));
 146     PRINTF ("Format date                        0x%04x\n",
 147             __le16_to_cpu (boot -> DateF));
 148     PRINTF ("Format time                        0x%04x\n",
 149             __le16_to_cpu (boot -> TimeF));
 150
 151
 152     /* information is extracted from boot sector                           */
 153     heads = __le16_to_cpu (boot -> nheads);
 154     sectors = __le16_to_cpu (boot -> nsect);
 155     fs -> tot_sectors = __le32_to_cpu (boot -> bigsect);
 156     if (__le16_to_cpu (boot -> psect) != 0) {
 157         fs -> tot_sectors = __le16_to_cpu (boot -> psect);
 158     }
 159
 160     sect_per_track = heads * sectors;
 161     tracks = (fs -> tot_sectors + sect_per_track - 1) / sect_per_track;
 162
 163     BootP = __le16_to_cpu (boot -> BootP);
 164     Infp0 = __le16_to_cpu (boot -> Infp0);
 165     InfpX = __le16_to_cpu (boot -> InfpX);
 166     InfTm = __le16_to_cpu (boot -> InfTm);
 167
 168     if (boot -> dos4 == EXTENDED_BOOT &&
 169         strncmp( boot->banner,"2M", 2 ) == 0 &&
 170         BootP < SZ_STD_SECTOR &&
 171         Infp0 < SZ_STD_SECTOR &&
 172         InfpX < SZ_STD_SECTOR &&
 173         InfTm < SZ_STD_SECTOR &&
 174         BootP >= InfTm + 2 &&
 175         InfTm >= InfpX &&
 176         InfpX >= Infp0 &&
 177         Infp0 >= 76 ) {
 178
 179         return (-1);
 180     }
 181
 182     if (heads != NB_HEADS ||
 183         tracks != NB_TRACKS ||
 184         sectors != NB_SECTORS ||
 185         __le16_to_cpu (boot -> secsiz) != SZ_STD_SECTOR ||
 186         fs -> tot_sectors == 0 ||
 187         (fs -> tot_sectors % sectors) != 0) {
 188         return (-1);
 189     }
 190
 191     return (0);
 192 }
 193
 194
 195 #endif