LXR uboot/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#define NB_HEADS        2
  32#define NB_TRACKS       80
  33#define NB_SECTORS      18
  34
  35
  36static int lastwhere;
  37
  38/*-----------------------------------------------------------------------------
  39 * dev_open --
  40 *-----------------------------------------------------------------------------
  41 */
  42int dev_open (void)
  43{
  44    lastwhere = 0;
  45    return (0);
  46}
  47
  48/*-----------------------------------------------------------------------------
  49 * dev_read -- len and where are sectors number
  50 *-----------------------------------------------------------------------------
  51 */
  52int dev_read (void *buffer, int where, int len)
  53{
  54    PRINTF ("dev_read (len = %d, where = %d)\n", len, where);
  55
  56    /* Si on ne desire pas lire a la position courante, il faut un seek      */
  57    if (where != lastwhere) {
  58        if (!fdc_fdos_seek (where)) {
  59            PRINTF ("seek error in dev_read");
  60            lastwhere = -1;
  61            return (-1);
  62        }
  63    }
  64
  65    if (!fdc_fdos_read (buffer, len)) {
  66        PRINTF ("read error\n");
  67        lastwhere = -1;
  68        return (-1);
  69    }
  70    lastwhere = where + len;
  71    return (0);
  72}
  73/*-----------------------------------------------------------------------------
  74 * check_dev -- verify the diskette format
  75 *-----------------------------------------------------------------------------
  76 */
  77int check_dev (BootSector_t *boot, Fs_t *fs)
  78{
  79    unsigned int heads, sectors, tracks;
  80    int BootP, Infp0, InfpX, InfTm;
  81    int sect_per_track;
  82
  83    /* Display Boot header                                                   */
  84    PRINTF ("Jump to boot code                  0x%02x 0x%02x 0x%02x\n",
  85            boot -> jump [0], boot -> jump [1], boot -> jump[2]);
  86    PRINTF ("OEM name & version                 '%*.*s'\n",
  87            BANNER_LG, BANNER_LG, boot -> banner );
  88    PRINTF ("Bytes per sector hopefully 512     %d\n",
  89            __le16_to_cpu (boot -> secsiz));
  90    PRINTF ("Cluster size in sectors            %d\n",
  91            boot -> clsiz);
  92    PRINTF ("Number of reserved (boot) sectors  %d\n",
  93            __le16_to_cpu (boot -> nrsvsect));
  94    PRINTF ("Number of FAT tables hopefully 2   %d\n",
  95            boot -> nfat);
  96    PRINTF ("Number of directory slots          %d\n",
  97            __le16_to_cpu (boot -> dirents));
  98    PRINTF ("Total sectors on disk              %d\n",
  99            __le16_to_cpu (boot -> psect));
 100    PRINTF ("Media descriptor=first byte of FAT %d\n",
 101            boot -> descr);
 102    PRINTF ("Sectors in FAT                     %d\n",
 103            __le16_to_cpu (boot -> fatlen));
 104    PRINTF ("Sectors/track                      %d\n",
 105            __le16_to_cpu (boot -> nsect));
 106    PRINTF ("Heads                              %d\n",
 107            __le16_to_cpu (boot -> nheads));
 108    PRINTF ("number of hidden sectors           %d\n",
 109            __le32_to_cpu (boot -> nhs));
 110    PRINTF ("big total sectors                  %d\n",
 111            __le32_to_cpu (boot -> bigsect));
 112    PRINTF ("physical drive ?                   %d\n",
 113            boot -> physdrive);
 114    PRINTF ("reserved                           %d\n",
 115            boot -> reserved);
 116    PRINTF ("dos > 4.0 diskette                 %d\n",
 117            boot -> dos4);
 118    PRINTF ("serial number                      %d\n",
 119            __le32_to_cpu (boot -> serial));
 120    PRINTF ("disk label                         %*.*s\n",
 121            LABEL_LG, LABEL_LG, boot -> label);
 122    PRINTF ("FAT type                           %8.8s\n",
 123            boot -> fat_type);
 124    PRINTF ("reserved by 2M                     %d\n",
 125            boot -> res_2m);
 126    PRINTF ("2M checksum (not used)             %d\n",
 127            boot -> CheckSum);
 128    PRINTF ("2MF format version                 %d\n",
 129            boot -> fmt_2mf);
 130    PRINTF ("1 if write track after format      %d\n",
 131            boot -> wt);
 132    PRINTF ("data transfer rate on track 0      %d\n",
 133            boot -> rate_0);
 134    PRINTF ("data transfer rate on track<>0     %d\n",
 135            boot -> rate_any);
 136    PRINTF ("offset to boot program             %d\n",
 137            __le16_to_cpu (boot -> BootP));
 138    PRINTF ("T1: information for track 0        %d\n",
 139            __le16_to_cpu (boot -> Infp0));
 140    PRINTF ("T2: information for track<>0       %d\n",
 141            __le16_to_cpu (boot -> InfpX));
 142    PRINTF ("T3: track sectors size table       %d\n",
 143            __le16_to_cpu (boot -> InfTm));
 144    PRINTF ("Format date                        0x%04x\n",
 145            __le16_to_cpu (boot -> DateF));
 146    PRINTF ("Format time                        0x%04x\n",
 147            __le16_to_cpu (boot -> TimeF));
 148
 149
 150    /* information is extracted from boot sector                           */
 151    heads = __le16_to_cpu (boot -> nheads);
 152    sectors = __le16_to_cpu (boot -> nsect);
 153    fs -> tot_sectors = __le32_to_cpu (boot -> bigsect);
 154    if (__le16_to_cpu (boot -> psect) != 0) {
 155        fs -> tot_sectors = __le16_to_cpu (boot -> psect);
 156    }
 157
 158    sect_per_track = heads * sectors;
 159    tracks = (fs -> tot_sectors + sect_per_track - 1) / sect_per_track;
 160
 161    BootP = __le16_to_cpu (boot -> BootP);
 162    Infp0 = __le16_to_cpu (boot -> Infp0);
 163    InfpX = __le16_to_cpu (boot -> InfpX);
 164    InfTm = __le16_to_cpu (boot -> InfTm);
 165
 166    if (boot -> dos4 == EXTENDED_BOOT &&
 167        strncmp( boot->banner,"2M", 2 ) == 0 &&
 168        BootP < SZ_STD_SECTOR &&
 169        Infp0 < SZ_STD_SECTOR &&
 170        InfpX < SZ_STD_SECTOR &&
 171        InfTm < SZ_STD_SECTOR &&
 172        BootP >= InfTm + 2 &&
 173        InfTm >= InfpX &&
 174        InfpX >= Infp0 &&
 175        Infp0 >= 76 ) {
 176
 177        return (-1);
 178    }
 179
 180    if (heads != NB_HEADS ||
 181        tracks != NB_TRACKS ||
 182        sectors != NB_SECTORS ||
 183        __le16_to_cpu (boot -> secsiz) != SZ_STD_SECTOR ||
 184        fs -> tot_sectors == 0 ||
 185        (fs -> tot_sectors % sectors) != 0) {
 186        return (-1);
 187    }
 188
 189    return (0);
 190}
 191