/* * (C) Copyright 2002 * St�ubli 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 <malloc.h> #include "dos.h" #include "fdos.h" /*----------------------------------------------------------------------------- * fill_fs -- Read info on file system *----------------------------------------------------------------------------- */ static int fill_fs (BootSector_t *boot, Fs_t *fs) { fs -> fat_start = __le16_to_cpu (boot -> nrsvsect); fs -> fat_len = __le16_to_cpu (boot -> fatlen); fs -> nb_fat = boot -> nfat; fs -> dir_start = fs -> fat_start + fs -> nb_fat * fs -> fat_len; fs -> dir_len = __le16_to_cpu (boot -> dirents) * MDIR_SIZE / SZ_STD_SECTOR; fs -> cluster_size = boot -> clsiz; fs -> num_clus = (fs -> tot_sectors - fs -> dir_start - fs -> dir_len) / fs -> cluster_size; return (0); } /*----------------------------------------------------------------------------- * fs_init -- *----------------------------------------------------------------------------- */ int fs_init (Fs_t *fs) { BootSector_t *boot; /* Initialize physical device */ if (dev_open () < 0) { PRINTF ("Unable to initialize the fdc\n"); return (-1); } init_subdir (); /* Allocate space for read the boot sector */ if ((boot = (BootSector_t *)malloc (sizeof (BootSector_t))) == NULL) { PRINTF ("Unable to allocate space for boot sector\n"); return (-1); } /* read boot sector */ if (dev_read (boot, 0, 1)){ PRINTF ("Error during boot sector read\n"); free (boot); return (-1); } /* we verify it'a a DOS diskette */ if (boot -> jump [0] != JUMP_0_1 && boot -> jump [0] != JUMP_0_2) { PRINTF ("Not a DOS diskette\n"); free (boot); return (-1); } if (boot -> descr < MEDIA_STD) { /* We handle only recent medias (type F0) */ PRINTF ("unrecognized diskette type\n"); free (boot); return (-1); } if (check_dev (boot, fs) < 0) { PRINTF ("Bad diskette\n"); free (boot); return (-1); } if (fill_fs (boot, fs) < 0) { free (boot); return (-1); } /* Read FAT */ if (read_fat (boot, fs) < 0) { free (boot); return (-1); } free (boot); return (0); }