99 lines
2.5 KiB
C
99 lines
2.5 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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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <config.h>
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#include <malloc.h>
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#include "dos.h"
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#include "fdos.h"
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/*-----------------------------------------------------------------------------
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* fill_fs -- Read info on file system
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*-----------------------------------------------------------------------------
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*/
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static int fill_fs (BootSector_t *boot, Fs_t *fs)
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{
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fs -> fat_start = __le16_to_cpu (boot -> nrsvsect);
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fs -> fat_len = __le16_to_cpu (boot -> fatlen);
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fs -> nb_fat = boot -> nfat;
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fs -> dir_start = fs -> fat_start + fs -> nb_fat * fs -> fat_len;
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fs -> dir_len = __le16_to_cpu (boot -> dirents) * MDIR_SIZE / SZ_STD_SECTOR;
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fs -> cluster_size = boot -> clsiz;
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fs -> num_clus = (fs -> tot_sectors - fs -> dir_start - fs -> dir_len) / fs -> cluster_size;
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return (0);
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}
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/*-----------------------------------------------------------------------------
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* fs_init --
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*-----------------------------------------------------------------------------
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*/
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int fs_init (Fs_t *fs)
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{
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BootSector_t *boot;
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/* Initialize physical device */
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if (dev_open () < 0) {
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PRINTF ("Unable to initialize the fdc\n");
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return (-1);
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}
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init_subdir ();
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/* Allocate space for read the boot sector */
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if ((boot = (BootSector_t *)malloc (sizeof (BootSector_t))) == NULL) {
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PRINTF ("Unable to allocate space for boot sector\n");
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return (-1);
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}
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/* read boot sector */
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if (dev_read (boot, 0, 1)){
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PRINTF ("Error during boot sector read\n");
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free (boot);
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return (-1);
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}
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/* we verify it'a a DOS diskette */
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if (boot -> jump [0] != JUMP_0_1 && boot -> jump [0] != JUMP_0_2) {
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PRINTF ("Not a DOS diskette\n");
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free (boot);
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return (-1);
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}
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if (boot -> descr < MEDIA_STD) {
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/* We handle only recent medias (type F0) */
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PRINTF ("unrecognized diskette type\n");
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free (boot);
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return (-1);
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}
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if (check_dev (boot, fs) < 0) {
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PRINTF ("Bad diskette\n");
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free (boot);
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return (-1);
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}
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if (fill_fs (boot, fs) < 0) {
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free (boot);
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return (-1);
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}
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/* Read FAT */
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if (read_fat (boot, fs) < 0) {
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free (boot);
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return (-1);
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}
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free (boot);
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return (0);
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}
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