mirror of
https://github.com/dingusdev/dingusppc.git
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163 lines
5.1 KiB
C++
163 lines
5.1 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-22 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file Macintosh Superdrive definitions. */
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#ifndef MAC_SUPERDRIVE_H
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#define MAC_SUPERDRIVE_H
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#include <core/timermanager.h>
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#include <devices/common/hwcomponent.h>
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#include <devices/floppy/floppyimg.h>
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#include <cinttypes>
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#include <memory>
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#include <string>
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// convert number of bytes to disk time = nbytes * bits_per_byte * 2 us
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#define MFM_BYTES_TO_DISK_TIME(bytes) USECS_TO_NSECS((bytes) * 8 * 2)
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// timing constans for MFM disks
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constexpr uint32_t MFM_INDX_MARK_DELAY = MFM_BYTES_TO_DISK_TIME(146);
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constexpr uint32_t MFM_ADR_MARK_DELAY = MFM_BYTES_TO_DISK_TIME(22);
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constexpr uint32_t MFM_SECT_DATA_DELAY = MFM_BYTES_TO_DISK_TIME(514);
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constexpr uint32_t MFM_DD_SECTOR_DELAY = MFM_BYTES_TO_DISK_TIME(658);
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constexpr uint32_t MFM_HD_SECTOR_DELAY = MFM_BYTES_TO_DISK_TIME(675);
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constexpr uint32_t MFM_DD_EOT_DELAY = MFM_BYTES_TO_DISK_TIME( 6250 - 182);
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constexpr uint32_t MFM_HD_EOT_DELAY = MFM_BYTES_TO_DISK_TIME(12500 - 204);
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namespace MacSuperdrive {
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/** Apple Drive status request addresses. */
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enum StatusAddr : uint8_t {
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Step_Status = 1,
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Motor_Status = 2,
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Eject_Latch = 3,
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Select_Head_0 = 4,
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MFM_Support = 5,
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Double_Sided = 6,
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Drive_Exists = 7,
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Disk_In_Drive = 8,
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Write_Protect = 9,
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Track_Zero = 0xA,
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Select_Head_1 = 0xC,
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Drive_Mode = 0xD,
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Drive_Ready = 0xE,
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Media_Kind = 0xF
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};
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/** Apple Drive command addresses. */
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enum CommandAddr : uint8_t {
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Step_Direction = 0,
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Do_Step = 1,
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Motor_On_Off = 2,
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Eject_Disk = 3,
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Reset_Eject_Latch = 4,
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Switch_Drive_Mode = 5,
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};
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/** Type of media currently in the drive. */
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enum MediaKind : uint8_t {
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low_density = 0,
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high_density = 1, // 1 or 2 MB disk
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};
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/** Disk recording method. */
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enum RecMethod : int {
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GCR = 0,
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MFM = 1
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};
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typedef struct SectorHdr {
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int track;
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int side;
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int sector;
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int format;
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} SectorHdr;
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class MacSuperDrive : public HWComponent {
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public:
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MacSuperDrive();
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~MacSuperDrive() = default;
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void command(uint8_t addr, uint8_t value);
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uint8_t status(uint8_t addr);
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int insert_disk(std::string& img_path, int write_flag);
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void init_track_search(int pos);
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uint64_t sync_to_disk();
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uint64_t next_addr_mark_delay(uint8_t *next_sect_num);
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uint64_t next_sector_delay();
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SectorHdr current_sector_header();
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char* get_sector_data_ptr(int sector_num);
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uint64_t sector_data_delay();
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double get_current_track_delay();
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double get_address_mark_delay();
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protected:
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void reset_params();
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void set_disk_phys_params();
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void switch_drive_mode(int mode);
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private:
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uint8_t has_disk;
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uint8_t eject_latch;
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uint8_t motor_stat; // spindle motor status: 1 - on, 0 - off
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uint8_t drive_mode; // drive mode: 0 - GCR, 1 - MFM
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uint8_t is_ready;
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uint8_t track_zero; // 1 - if head is at track zero
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int step_dir; // step direction -1/+1
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int cur_track; // track number the head is currently at
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int cur_head; // current head number: 1 - upper, 0 - lower
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int cur_sector; // current sector number
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int next_sector; // next sector number
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uint64_t motor_on_time = 0; // time in ns the spindle motor was switched on
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uint64_t track_start_time = 0;
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uint64_t sector_start_time = 0;
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// physical parameters of the currently inserted disk
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uint8_t media_kind;
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uint8_t wr_protect;
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uint8_t format_byte;
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int rec_method;
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int num_tracks;
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int num_sides;
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int sectors_per_track[80];
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int rpm_per_track[80];
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int track2lblk[80]; // convert track number to first logical block number
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// timing parameters for MFM disks
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uint32_t index_delay; // number of ns needed to read the index mark
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uint32_t addr_mark_delay; // number of ns needed to read an address index mark
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uint32_t sector_delay; // number of ns needed to read a sector
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uint32_t eot_delay; // number of ns until end of track gap
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std::unique_ptr<FloppyImgConverter> img_conv;
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std::unique_ptr<char[]> disk_data;
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};
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}; // namespace MacSuperdrive
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#endif // MAC_SUPERDRIVE_H
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