mirror of
https://github.com/smaeul/u-boot.git
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196 lines
6.3 KiB
C
196 lines
6.3 KiB
C
/*
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* (C) Copyright 2002
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* Stäubli Faverges - <www.staubli.com>
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* Pierre AUBERT p.aubert@staubli.com
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <config.h>
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#include "dos.h"
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#include "fdos.h"
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#if defined(CONFIG_CMD_FDOS)
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#define NB_HEADS 2
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#define NB_TRACKS 80
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#define NB_SECTORS 18
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static int lastwhere;
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/*-----------------------------------------------------------------------------
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* dev_open --
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*-----------------------------------------------------------------------------
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*/
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int dev_open (void)
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{
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lastwhere = 0;
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return (0);
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}
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/*-----------------------------------------------------------------------------
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* dev_read -- len and where are sectors number
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*-----------------------------------------------------------------------------
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*/
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int dev_read (void *buffer, int where, int len)
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{
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PRINTF ("dev_read (len = %d, where = %d)\n", len, where);
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/* Si on ne desire pas lire a la position courante, il faut un seek */
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if (where != lastwhere) {
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if (!fdc_fdos_seek (where)) {
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PRINTF ("seek error in dev_read");
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lastwhere = -1;
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return (-1);
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}
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}
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if (!fdc_fdos_read (buffer, len)) {
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PRINTF ("read error\n");
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lastwhere = -1;
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return (-1);
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}
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lastwhere = where + len;
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return (0);
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}
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/*-----------------------------------------------------------------------------
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* check_dev -- verify the diskette format
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*-----------------------------------------------------------------------------
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*/
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int check_dev (BootSector_t *boot, Fs_t *fs)
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{
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unsigned int heads, sectors, tracks;
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int BootP, Infp0, InfpX, InfTm;
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int sect_per_track;
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/* Display Boot header */
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PRINTF ("Jump to boot code 0x%02x 0x%02x 0x%02x\n",
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boot -> jump [0], boot -> jump [1], boot -> jump[2]);
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PRINTF ("OEM name & version '%*.*s'\n",
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BANNER_LG, BANNER_LG, boot -> banner );
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PRINTF ("Bytes per sector hopefully 512 %d\n",
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__le16_to_cpu (boot -> secsiz));
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PRINTF ("Cluster size in sectors %d\n",
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boot -> clsiz);
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PRINTF ("Number of reserved (boot) sectors %d\n",
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__le16_to_cpu (boot -> nrsvsect));
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PRINTF ("Number of FAT tables hopefully 2 %d\n",
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boot -> nfat);
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PRINTF ("Number of directory slots %d\n",
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__le16_to_cpu (boot -> dirents));
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PRINTF ("Total sectors on disk %d\n",
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__le16_to_cpu (boot -> psect));
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PRINTF ("Media descriptor=first byte of FAT %d\n",
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boot -> descr);
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PRINTF ("Sectors in FAT %d\n",
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__le16_to_cpu (boot -> fatlen));
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PRINTF ("Sectors/track %d\n",
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__le16_to_cpu (boot -> nsect));
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PRINTF ("Heads %d\n",
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__le16_to_cpu (boot -> nheads));
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PRINTF ("number of hidden sectors %d\n",
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__le32_to_cpu (boot -> nhs));
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PRINTF ("big total sectors %d\n",
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__le32_to_cpu (boot -> bigsect));
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PRINTF ("physical drive ? %d\n",
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boot -> physdrive);
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PRINTF ("reserved %d\n",
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boot -> reserved);
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PRINTF ("dos > 4.0 diskette %d\n",
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boot -> dos4);
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PRINTF ("serial number %d\n",
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__le32_to_cpu (boot -> serial));
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PRINTF ("disk label %*.*s\n",
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LABEL_LG, LABEL_LG, boot -> label);
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PRINTF ("FAT type %8.8s\n",
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boot -> fat_type);
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PRINTF ("reserved by 2M %d\n",
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boot -> res_2m);
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PRINTF ("2M checksum (not used) %d\n",
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boot -> CheckSum);
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PRINTF ("2MF format version %d\n",
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boot -> fmt_2mf);
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PRINTF ("1 if write track after format %d\n",
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boot -> wt);
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PRINTF ("data transfer rate on track 0 %d\n",
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boot -> rate_0);
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PRINTF ("data transfer rate on track<>0 %d\n",
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boot -> rate_any);
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PRINTF ("offset to boot program %d\n",
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__le16_to_cpu (boot -> BootP));
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PRINTF ("T1: information for track 0 %d\n",
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__le16_to_cpu (boot -> Infp0));
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PRINTF ("T2: information for track<>0 %d\n",
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__le16_to_cpu (boot -> InfpX));
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PRINTF ("T3: track sectors size table %d\n",
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__le16_to_cpu (boot -> InfTm));
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PRINTF ("Format date 0x%04x\n",
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__le16_to_cpu (boot -> DateF));
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PRINTF ("Format time 0x%04x\n",
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__le16_to_cpu (boot -> TimeF));
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/* information is extracted from boot sector */
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heads = __le16_to_cpu (boot -> nheads);
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sectors = __le16_to_cpu (boot -> nsect);
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fs -> tot_sectors = __le32_to_cpu (boot -> bigsect);
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if (__le16_to_cpu (boot -> psect) != 0) {
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fs -> tot_sectors = __le16_to_cpu (boot -> psect);
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}
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sect_per_track = heads * sectors;
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tracks = (fs -> tot_sectors + sect_per_track - 1) / sect_per_track;
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BootP = __le16_to_cpu (boot -> BootP);
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Infp0 = __le16_to_cpu (boot -> Infp0);
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InfpX = __le16_to_cpu (boot -> InfpX);
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InfTm = __le16_to_cpu (boot -> InfTm);
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if (boot -> dos4 == EXTENDED_BOOT &&
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strncmp( boot->banner,"2M", 2 ) == 0 &&
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BootP < SZ_STD_SECTOR &&
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Infp0 < SZ_STD_SECTOR &&
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InfpX < SZ_STD_SECTOR &&
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InfTm < SZ_STD_SECTOR &&
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BootP >= InfTm + 2 &&
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InfTm >= InfpX &&
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InfpX >= Infp0 &&
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Infp0 >= 76 ) {
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return (-1);
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}
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if (heads != NB_HEADS ||
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tracks != NB_TRACKS ||
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sectors != NB_SECTORS ||
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__le16_to_cpu (boot -> secsiz) != SZ_STD_SECTOR ||
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fs -> tot_sectors == 0 ||
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(fs -> tot_sectors % sectors) != 0) {
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return (-1);
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}
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return (0);
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}
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#endif
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