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