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/* $Id: floppyt.c $ */
/** @file
* Floppy drive tables.
*/
/*
* Copyright (C) 2011-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* 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, in version 3 of the
* License.
*
* 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, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include <stdint.h>
#include <string.h>
#include "biosint.h"
#include "inlines.h"
/**
* Extended DPT (Disk Parameter Table) structure.
*/
typedef struct
{
uint8_t spec1; /* First SPECIFY byte. */
uint8_t spec2; /* Second SPECIFY byte. */
uint8_t mot_wait; /* Motor wait time after operation. */
uint8_t ss_code; /* Sector size code. */
uint8_t eot; /* End of Track (ID of last sector). */
uint8_t gap; /* Gap length. */
uint8_t dtl; /* Data length. */
uint8_t fmt_gap; /* Gap length for format. */
uint8_t fmt_fill; /* Format fill byte. */
uint8_t hd_settle; /* Head settle time (msec). */
uint8_t mot_start; /* Motor start time (1/8 sec units). */
uint8_t max_trk; /* Maximum track number. */
uint8_t rate; /* Data transfer rate code. */
} dpt_ext;
ct_assert(sizeof(dpt_ext) == 13);
/* Motor spin-up wait time in BIOS ticks (~2 seconds). */
#define MOTOR_WAIT 0x25
/* Data rates as stored in the DPT */
#define RATE_250K 0x80
#define RATE_300K 0x40
#define RATE_500K 0x00
#define RATE_1M 0xC0
/* In the 13-entry DPT, 7 entries are constant. Use a macro to set those. */
#define MAKE_DPT_ENTRY(sp1, eot, gap, fgp, mxt, dtr) \
{ sp1, 2, MOTOR_WAIT, 2, eot, gap, 0xFF, fgp, 0xF6, 15, 8, mxt, dtr }
dpt_ext fd_parm[] = {
MAKE_DPT_ENTRY(0xDF, 9, 0x2A, 0x50, 39, RATE_250K), /* 360K disk/360K drive */
MAKE_DPT_ENTRY(0xDF, 9, 0x2A, 0x50, 39, RATE_300K), /* 360K disk/1.2M drive */
MAKE_DPT_ENTRY(0xDF, 15, 0x1B, 0x54, 79, RATE_500K), /* 1.2M disk */
MAKE_DPT_ENTRY(0xDF, 9, 0x2A, 0x50, 79, RATE_250K), /* 720K disk */
MAKE_DPT_ENTRY(0xAF, 18, 0x1B, 0x6C, 79, RATE_500K), /* 1.44M disk */
MAKE_DPT_ENTRY(0xAF, 36, 0x1B, 0x54, 79, RATE_1M), /* 2.88M disk */
MAKE_DPT_ENTRY(0xAF, 255, 0x1B, 0x54, 255, RATE_500K) /* Fake mega-disk */
};
typedef struct {
uint8_t type; /* Drive type. */
uint8_t dpt_entry; /* Index of entry in fd_parm. */
} fd_map_entry;
/* Drive types as stored in the CMOS. Must match DevPCBios! */
#define FDRV_360K 1
#define FDRV_1_2M 2
#define FDRV_720K 3
#define FDRV_1_44M 4
#define FDRV_2_88M 5
#define FDRV_15M 14
#define FDRV_63M 15
/* A table mapping (CMOS) drive types to DPT entries. */
fd_map_entry fd_map[] = {
{ FDRV_360K, 0 },
{ FDRV_1_2M, 2 },
{ FDRV_720K, 3 },
{ FDRV_1_44M, 4 },
{ FDRV_2_88M, 5 },
{ FDRV_15M, 6 },
{ FDRV_63M, 6 }
};
/* Find a DPT corresponding to the given drive type. */
dpt_ext *get_floppy_dpt(uint8_t drv_typ)
{
int i;
for (i = 0; i < sizeof(fd_map) / sizeof(fd_map[0]); ++i)
if (fd_map[i].type == drv_typ)
return &fd_parm[fd_map[i].dpt_entry];
/* As a fallback, return the 1.44M DPT. */
return &fd_parm[5];
}
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