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/*
* (C) Copyright 2002
* Stäubli Faverges - <www.staubli.com>
* Pierre AUBERT p.aubert@staubli.com
*
* SPDX-License-Identifier: GPL-2.0+
*/
#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);
}
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