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https://github.com/dingusdev/dingusppc.git
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637844269f
The disk cache is unchanged. data_ptr continues to be only used for the user data sector area for each block. The other sector areas (synch, header, etc.) are filled in while reading. has_data and get_data exist as a way to bypass data_ptr for parts of the transfer outside the user data sector area of each block. The default behaviour is defined in atabasedevice and is overridden by atapicdrom for the Read CD command. atapicdrom has a flag doing_sector_areas to control the behavior of the get_data method. When the flag is true, the sector_areas, current_block, and current_block_byte are used for selecting the correct data from one of the sector areas. The Read CD command initializes those variables. xfer_cnt remains the total number of bytes to be transferred and is now not necessarily the same as the number of disk image blocks read into the disk cache. lba_to_msf is used to fill in the header. The values was not verified using a real CD. Mac OS X just cares about the Mode in the header. For now, only the synch and header and user data areas are filled in. The other areas read as all zeros.
80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-23 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 Virtual CD-ROM drive definitions. */
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#ifndef CD_ROM_DRIVE_H
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#define CD_ROM_DRIVE_H
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#include <devices/storage/blockstoragedevice.h>
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#include <cinttypes>
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#include <functional>
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/* Original CD-ROM addressing mode expressed
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in minutes, seconds and frames */
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typedef struct {
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int min;
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int sec;
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int frm;
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} AddrMsf;
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/* Descriptor for CD-ROM tracks in TOC */
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typedef struct {
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uint8_t trk_num;
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uint8_t adr_ctrl;
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uint32_t start_lba;
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} TrackDescriptor;
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#define CDROM_MAX_TRACKS 100
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#define LEAD_OUT_TRK_NUM 0xAA
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class CdromDrive : public BlockStorageDevice {
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public:
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CdromDrive();
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virtual ~CdromDrive() = default;
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void set_error_callback(std::function<void(uint8_t, uint8_t)>&& err_cb) {
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this->set_error = std::move(err_cb);
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}
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bool medium_present() { return this->is_ready; }
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void insert_image(std::string filename);
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uint32_t inquiry(uint8_t *cmd_ptr, uint8_t *data_ptr);
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uint32_t mode_sense_ex(uint8_t *cmd_ptr, uint8_t *data_ptr);
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uint32_t request_sense(uint8_t *data_ptr, uint8_t sense_key, uint8_t asc,
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uint8_t ascq);
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uint32_t report_capacity(uint8_t *data_ptr);
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uint32_t read_toc(uint8_t *cmd_ptr, uint8_t *data_ptr);
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AddrMsf lba_to_msf(const int lba);
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protected:
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std::function<void(uint8_t, uint8_t)> set_error;
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TrackDescriptor tracks[CDROM_MAX_TRACKS];
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int num_tracks;
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};
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#endif // CD_ROM_DRIVE_H
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