dingusppc/devices/floppy/superdrive.h
2022-11-17 18:03:18 +01:00

163 lines
5.1 KiB
C++

/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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/>.
*/
/** @file Macintosh Superdrive definitions. */
#ifndef MAC_SUPERDRIVE_H
#define MAC_SUPERDRIVE_H
#include <core/timermanager.h>
#include <devices/common/hwcomponent.h>
#include <devices/floppy/floppyimg.h>
#include <cinttypes>
#include <memory>
#include <string>
// convert number of bytes to disk time = nbytes * bits_per_byte * 2 us
#define MFM_BYTES_TO_DISK_TIME(bytes) USECS_TO_NSECS((bytes) * 8 * 2)
// timing constans for MFM disks
constexpr uint32_t MFM_INDX_MARK_DELAY = MFM_BYTES_TO_DISK_TIME(146);
constexpr uint32_t MFM_ADR_MARK_DELAY = MFM_BYTES_TO_DISK_TIME(22);
constexpr uint32_t MFM_SECT_DATA_DELAY = MFM_BYTES_TO_DISK_TIME(514);
constexpr uint32_t MFM_DD_SECTOR_DELAY = MFM_BYTES_TO_DISK_TIME(658);
constexpr uint32_t MFM_HD_SECTOR_DELAY = MFM_BYTES_TO_DISK_TIME(675);
constexpr uint32_t MFM_DD_EOT_DELAY = MFM_BYTES_TO_DISK_TIME( 6250 - 182);
constexpr uint32_t MFM_HD_EOT_DELAY = MFM_BYTES_TO_DISK_TIME(12500 - 204);
namespace MacSuperdrive {
/** Apple Drive status request addresses. */
enum StatusAddr : uint8_t {
Step_Status = 1,
Motor_Status = 2,
Eject_Latch = 3,
Select_Head_0 = 4,
MFM_Support = 5,
Double_Sided = 6,
Drive_Exists = 7,
Disk_In_Drive = 8,
Write_Protect = 9,
Track_Zero = 0xA,
Select_Head_1 = 0xC,
Drive_Mode = 0xD,
Drive_Ready = 0xE,
Media_Kind = 0xF
};
/** Apple Drive command addresses. */
enum CommandAddr : uint8_t {
Step_Direction = 0,
Do_Step = 1,
Motor_On_Off = 2,
Eject_Disk = 3,
Reset_Eject_Latch = 4,
Switch_Drive_Mode = 5,
};
/** Type of media currently in the drive. */
enum MediaKind : uint8_t {
low_density = 0,
high_density = 1, // 1 or 2 MB disk
};
/** Disk recording method. */
enum RecMethod : int {
GCR = 0,
MFM = 1
};
typedef struct SectorHdr {
int track;
int side;
int sector;
int format;
} SectorHdr;
class MacSuperDrive : public HWComponent {
public:
MacSuperDrive();
~MacSuperDrive() = default;
void command(uint8_t addr, uint8_t value);
uint8_t status(uint8_t addr);
int insert_disk(std::string& img_path, int write_flag);
void init_track_search(int pos);
uint64_t sync_to_disk();
uint64_t next_addr_mark_delay(uint8_t *next_sect_num);
uint64_t next_sector_delay();
SectorHdr current_sector_header();
char* get_sector_data_ptr(int sector_num);
uint64_t sector_data_delay();
double get_current_track_delay();
double get_address_mark_delay();
protected:
void reset_params();
void set_disk_phys_params();
void switch_drive_mode(int mode);
private:
uint8_t has_disk;
uint8_t eject_latch;
uint8_t motor_stat; // spindle motor status: 1 - on, 0 - off
uint8_t drive_mode; // drive mode: 0 - GCR, 1 - MFM
uint8_t is_ready;
uint8_t track_zero; // 1 - if head is at track zero
int step_dir; // step direction -1/+1
int cur_track; // track number the head is currently at
int cur_head; // current head number: 1 - upper, 0 - lower
int cur_sector; // current sector number
int next_sector; // next sector number
uint64_t motor_on_time = 0; // time in ns the spindle motor was switched on
uint64_t track_start_time = 0;
uint64_t sector_start_time = 0;
// physical parameters of the currently inserted disk
uint8_t media_kind;
uint8_t wr_protect;
uint8_t format_byte;
int rec_method;
int num_tracks;
int num_sides;
int sectors_per_track[80];
int rpm_per_track[80];
int track2lblk[80]; // convert track number to first logical block number
// timing parameters for MFM disks
uint32_t index_delay; // number of ns needed to read the index mark
uint32_t addr_mark_delay; // number of ns needed to read an address index mark
uint32_t sector_delay; // number of ns needed to read a sector
uint32_t eot_delay; // number of ns until end of track gap
std::unique_ptr<FloppyImgConverter> img_conv;
std::unique_ptr<char[]> disk_data;
};
}; // namespace MacSuperdrive
#endif // MAC_SUPERDRIVE_H