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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.
67 lines
1.8 KiB
C++
67 lines
1.8 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 ATAPI CDROM definitions. */
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#ifndef ATAPI_CDROM_H
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#define ATAPI_CDROM_H
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#include <devices/common/ata/atapibasedevice.h>
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#include <devices/storage/cdromdrive.h>
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#include <string>
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class AtapiCdrom : public AtapiBaseDevice, public CdromDrive {
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public:
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AtapiCdrom(std::string name);
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~AtapiCdrom() = default;
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static std::unique_ptr<HWComponent> create() {
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return std::unique_ptr<AtapiCdrom>(new AtapiCdrom("ATAPI-CDROM"));
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}
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int device_postinit() override;
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void perform_packet_command() override;
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int request_data() override;
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bool data_available() override {
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return this->data_left() != 0;
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}
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void status_good();
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void status_error(uint8_t sense_key, uint8_t asc);
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uint16_t get_data();
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private:
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uint8_t sense_key = 0;
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uint8_t asc = 0;
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uint8_t ascq = 0;
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bool doing_sector_areas = false;
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uint8_t sector_areas;
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uint32_t current_block;
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uint16_t current_block_byte;
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};
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#endif // ATAPI_CDROM_H
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