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/*
* CHU - driver for CH375 in disk mode
* Copyright (C) 2024 Javier S. Pedro
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#ifndef CHUDISK_H
#define CHUDISK_H
#include <stdbool.h>
#include "inc/dosdrv.h"
#define MAX_UNITS 4
#define SECTOR_SIZE 512
// Configuration values shared between driver init code and resident code
/* Used by ch375.h, too. */
extern unsigned short ch375_port;
extern unsigned char num_units;
extern bool read_only;
extern bool show_fat32;
extern struct chudisk_data
{
/** Pointers to all BPBs, to return to DOS during init. */
DOS_BPB * bpb_ptrs[MAX_UNITS];
/** Whether we are ready to handle IO, i.e. disk init, partitions scanned. */
bool ready;
uint32_t sectors;
uint32_t bytesPerSector;
struct chudisk_unit {
/** Whether the partition exists (start_sector points to it) */
bool exists;
/** Note in theory may be zero (superfloppy) */
uint32_t start_sector;
/** Number of sectors for this partition. */
uint32_t sectors;
/** Whether the partition's BPB was loaded. */
bool ready;
/** DOS device params (contains BPB), only valid if 'ready'. */
DOS_BPB bpb;
} unit[MAX_UNITS];
} data;
// Functions called by both init part and resident part
extern void driver_init(DOS_DRS __far *drs);
extern char resident_end;
extern uint8_t wait_for_ch375_result(unsigned int max_ticks);
// CHUDISK IOCTLs
// These are used with the DISK major
// TODO Not sure we can really happily add custom minors here,
// but then again DOS outright refuses to accept any other major
enum CHUDISK_IOCTL_DISK_MINOR {
CHUDISK_IOCTL_DISK_READ_ABS_SECTOR = 0xC1
};
typedef _Packed union CHUDISK_IOCTL_DISK_DATA
{
struct CHUDISK_RWABSSECTOR {
uint32_t sector;
uint8_t sectors;
void far * buffer;
} rwabs;
} CHUDISK_IOCTL_DISK_DATA;
#endif // CHUDISK_H
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