mirror of
https://github.com/dingusdev/dingusppc.git
synced 2024-06-12 11:29:29 +00:00
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.
381 lines
14 KiB
C++
381 lines
14 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 implementation. */
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#include <devices/common/ata/atadefs.h>
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#include <devices/common/ata/atapicdrom.h>
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#include <devices/common/scsi/scsi.h> // ATAPI CDROM reuses SCSI commands (sic!)
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#include <devices/deviceregistry.h>
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#include <machines/machinebase.h>
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#include <machines/machineproperties.h>
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#include <memaccess.h>
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#include <string>
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using namespace ata_interface;
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AtapiCdrom::AtapiCdrom(std::string name) : AtapiBaseDevice(name) {
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this->set_error_callback(
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[this](uint8_t sense_key, uint8_t asc) {
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this->status_error(sense_key, asc);
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}
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);
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}
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int AtapiCdrom::device_postinit() {
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std::string cdr_config = GET_STR_PROP("cdr_config");
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if (cdr_config.empty()) {
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LOG_F(ERROR, "%s: cdr_config property is empty", this->name.c_str());
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return -1;
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}
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std::string bus_id;
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uint32_t dev_num;
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parse_device_path(cdr_config, bus_id, dev_num);
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auto bus_obj = dynamic_cast<IdeChannel*>(gMachineObj->get_comp_by_name(bus_id));
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bus_obj->register_device(dev_num, this);
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std::string cdr_image_path = GET_STR_PROP("cdr_img");
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if (!cdr_image_path.empty()) {
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this->insert_image(cdr_image_path);
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}
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return 0;
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}
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void AtapiCdrom::perform_packet_command() {
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uint32_t lba, xfer_len;
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this->r_status |= BSY;
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this->sector_areas = 0;
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if (this->doing_sector_areas) {
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this->doing_sector_areas = false;
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LOG_F(WARNING, "%s: doing_sector_areas reset", this->name.c_str());
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}
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switch (this->cmd_pkt[0]) {
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case ScsiCommand::TEST_UNIT_READY:
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if (this->medium_present())
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this->status_good();
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else
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this->status_error(ScsiSense::NOT_READY, ScsiError::MEDIUM_NOT_PRESENT);
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this->present_status();
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break;
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case ScsiCommand::REQ_SENSE:
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xfer_len = this->request_sense(this->data_buf, this->sense_key, this->asc, this->ascq);
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if (!xfer_len) {
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this->present_status();
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} else {
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this->xfer_cnt = std::min((uint32_t)this->r_byte_count, xfer_len);
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this->data_ptr = (uint16_t*)this->data_buf;
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this->status_good();
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this->data_out_phase();
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}
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break;
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case ScsiCommand::INQUIRY:
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this->xfer_cnt = this->inquiry(this->cmd_pkt, this->data_buf);
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this->r_byte_count = this->xfer_cnt;
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this->data_ptr = (uint16_t*)this->data_buf;
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this->status_good();
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this->data_out_phase();
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break;
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case ScsiCommand::START_STOP_UNIT:
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if ((this->cmd_pkt[4] & 3) == 2) {
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LOG_F(WARNING, "CD-ROM eject requested");
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}
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this->status_good();
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this->present_status();
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break;
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case ScsiCommand::PREVENT_ALLOW_MEDIUM_REMOVAL:
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LOG_F(INFO, "%s: medium removal %s", this->name.c_str(),
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this->cmd_pkt[4] & 1 ? "prevented" : "allowed");
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this->status_good();
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this->present_status();
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break;
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case ScsiCommand::READ_CAPACITY_10:
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this->xfer_cnt = this->report_capacity(this->data_buf);
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this->r_byte_count = this->xfer_cnt;
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this->data_ptr = (uint16_t*)this->data_buf;
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this->status_good();
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this->data_out_phase();
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break;
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case ScsiCommand::READ_TOC:
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this->status_good();
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xfer_len = this->read_toc(this->cmd_pkt, this->data_buf);
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if (!xfer_len) {
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this->present_status();
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} else {
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this->xfer_cnt = std::min((uint32_t)this->r_byte_count, xfer_len);
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this->data_ptr = (uint16_t*)this->data_buf;
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this->data_out_phase();
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}
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break;
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case ScsiCommand::MODE_SENSE_10:
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this->xfer_cnt = this->mode_sense_ex(this->cmd_pkt, this->data_buf);
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if (!this->xfer_cnt) {
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this->present_status();
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} else {
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this->r_byte_count = this->xfer_cnt;
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this->data_ptr = (uint16_t*)this->data_buf;
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this->status_good();
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this->data_out_phase();
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}
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break;
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case ScsiCommand::READ_6:
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lba = this->cmd_pkt[1] << 16 | READ_WORD_BE_U(&this->cmd_pkt[2]);
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xfer_len = this->cmd_pkt[4];
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if (this->r_features & ATAPI_Features::DMA) {
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LOG_F(WARNING, "ATAPI DMA transfer requsted");
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}
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this->set_fpos(lba);
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this->xfer_cnt = this->read_begin(xfer_len, this->r_byte_count);
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this->r_byte_count = this->xfer_cnt;
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this->data_ptr = (uint16_t*)this->data_cache.get();
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this->status_good();
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this->data_out_phase();
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break;
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case ScsiCommand::READ_10:
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lba = READ_DWORD_BE_U(&this->cmd_pkt[2]);
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xfer_len = READ_WORD_BE_U(&this->cmd_pkt[7]);
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if (this->r_features & ATAPI_Features::DMA) {
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LOG_F(WARNING, "ATAPI DMA transfer requsted");
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}
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this->set_fpos(lba);
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this->xfer_cnt = this->read_begin(xfer_len, this->r_byte_count);
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this->r_byte_count = this->xfer_cnt;
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this->data_ptr = (uint16_t*)this->data_cache.get();
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this->status_good();
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this->data_out_phase();
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break;
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case ScsiCommand::READ_12:
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lba = READ_DWORD_BE_U(&this->cmd_pkt[2]);
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xfer_len = READ_DWORD_BE_U(&this->cmd_pkt[6]);
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if (this->r_features & ATAPI_Features::DMA) {
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LOG_F(WARNING, "ATAPI DMA transfer requsted");
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}
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this->set_fpos(lba);
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this->xfer_cnt = this->read_begin(xfer_len, this->r_byte_count);
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this->r_byte_count = this->xfer_cnt;
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this->data_ptr = (uint16_t*)this->data_cache.get();
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this->status_good();
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this->data_out_phase();
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break;
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case ScsiCommand::SET_CD_SPEED:
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LOG_F(INFO, "%s: speed set to %d kBps", this->name.c_str(),
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READ_WORD_BE_U(&this->cmd_pkt[2]));
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this->status_good();
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this->present_status();
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break;
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case ScsiCommand::READ_CD:
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{
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lba = READ_DWORD_BE_U(&this->cmd_pkt[2]);
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xfer_len = (this->cmd_pkt[6] << 16) | READ_WORD_BE_U(&this->cmd_pkt[7]);
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if (this->cmd_pkt[1] || (this->cmd_pkt[9] & ~0xf8) || ((this->cmd_pkt[9] & 0xf8) == 0) || this->cmd_pkt[10])
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LOG_F(WARNING, "%s: unsupported READ_CD params: %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X",
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this->name.c_str(),
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this->cmd_pkt[0], this->cmd_pkt[1], this->cmd_pkt[2], this->cmd_pkt[3], this->cmd_pkt[4], this->cmd_pkt[5],
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this->cmd_pkt[6], this->cmd_pkt[7], this->cmd_pkt[8], this->cmd_pkt[9], this->cmd_pkt[10], this->cmd_pkt[11]
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);
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if (this->r_features & ATAPI_Features::DMA) {
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LOG_F(WARNING, "ATAPI DMA transfer requsted");
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}
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this->set_fpos(lba);
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this->sector_areas = cmd_pkt[9];
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this->doing_sector_areas = true;
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this->current_block = lba;
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this->current_block_byte = 0;
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int bytes_prolog = 0;
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int bytes_data = 0;
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int bytes_epilog = 0;
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// For Mode 1 CD-ROMs:
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if (this->sector_areas & 0x80) bytes_prolog += 12; // Sync
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if (this->sector_areas & 0x20) bytes_prolog += 4; // Header
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if (this->sector_areas & 0x40) bytes_prolog += 0; // SubHeader
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if (this->sector_areas & 0x10) bytes_data += 2048; // User
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if (this->sector_areas & 0x08) bytes_epilog += 288; // Auxiliary
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if (this->sector_areas & 0x02) bytes_epilog += 294; // ErrorFlags
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if (this->sector_areas & 0x01) bytes_epilog += 96; // SubChannel
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int bytes_per_block = bytes_prolog + bytes_data + bytes_epilog;
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int disk_image_byte_count;
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if (bytes_per_block == 0) {
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disk_image_byte_count = 0xffff;
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}
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else {
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disk_image_byte_count = (this->r_byte_count / bytes_per_block) * this->block_size; // whole blocks
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if ((this->r_byte_count % bytes_per_block) > bytes_prolog) { // partial block
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int disk_image_byte_count_partial_block = (this->r_byte_count % bytes_per_block) - bytes_prolog; // remove prolog from partial block
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if (disk_image_byte_count_partial_block > this->block_size) { // partial block includes some epilog?
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disk_image_byte_count_partial_block = this->block_size; // // remove epilog from partial block
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}
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// add partial block
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disk_image_byte_count += disk_image_byte_count_partial_block;
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}
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}
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int disk_image_bytes_received = this->read_begin(xfer_len, disk_image_byte_count);
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int bytes_received = (disk_image_bytes_received / this->block_size) * bytes_per_block + bytes_prolog + (disk_image_bytes_received % this->block_size); // whole blocks + prolog + partial block
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if (bytes_received > this->r_byte_count) { // if partial epilog or partial prolog
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bytes_received = this->r_byte_count; // confine to r_byte_count
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}
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this->r_byte_count = bytes_received;
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this->xfer_cnt = bytes_received;
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this->data_ptr = (uint16_t*)this->data_cache.get();
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this->status_good();
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this->data_out_phase();
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break;
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}
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default:
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LOG_F(ERROR, "%s: unsupported ATAPI command 0x%X", this->name.c_str(),
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this->cmd_pkt[0]);
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this->status_error(ScsiSense::ILLEGAL_REQ, ScsiError::INVALID_CMD);
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this->present_status();
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}
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}
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int AtapiCdrom::request_data() {
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// continuation of READ_CD above
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this->data_ptr = (uint16_t*)this->data_cache.get();
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this->xfer_cnt = this->read_more();
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return this->xfer_cnt;
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}
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static const uint8_t mode_1_sync[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 };
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uint16_t AtapiCdrom::get_data() {
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uint16_t ret_data;
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if (doing_sector_areas) {
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// For Mode 1 CD-ROMs:
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int area_start;
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int area_end = 0;
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ret_data = 0xffff;
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if (this->sector_areas & 0x80) {
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area_start = area_end;
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area_end += 12; // Sync
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if (this->current_block_byte >= area_start && this->current_block_byte < area_end) {
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ret_data = BYTESWAP_16(*((uint16_t*)(&mode_1_sync[current_block_byte - area_start])));
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}
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}
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if (this->sector_areas & 0x20) {
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area_start = area_end;
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area_end += 4; // Header
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if (this->current_block_byte >= area_start && this->current_block_byte < area_end) {
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AddrMsf msf = lba_to_msf(this->current_block + 150);
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uint8_t header[4];
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header[0] = msf.min;
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header[1] = msf.sec;
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header[2] = msf.frm;
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header[3] = 0x01; // Mode 1
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ret_data = BYTESWAP_16(*((uint16_t*)(&header[current_block_byte - area_start])));
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}
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}
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if (this->sector_areas & 0x40) {
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area_start = area_end;
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area_end += 0; // SubHeader
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if (this->current_block_byte >= area_start && this->current_block_byte < area_end) {
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ret_data = 0;
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}
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}
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if (this->sector_areas & 0x10) {
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area_start = area_end;
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area_end += 2048; // User
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if (this->current_block_byte >= area_start && this->current_block_byte < area_end) {
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ret_data = AtaBaseDevice::get_data();
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}
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}
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if (this->sector_areas & 0x08) {
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area_start = area_end;
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area_end += 288; // Auxiliary
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if (this->current_block_byte >= area_start && this->current_block_byte < area_end) {
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ret_data = 0;
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}
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}
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if (this->sector_areas & 0x02) {
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area_start = area_end;
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area_end += 294; // ErrorFlags
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if (this->current_block_byte >= area_start && this->current_block_byte < area_end) {
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ret_data = 0;
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}
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}
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if (this->sector_areas & 0x01) {
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area_start = area_end;
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area_end += 96; // SubChannel
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if (this->current_block_byte >= area_start && this->current_block_byte < area_end) {
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ret_data = 0;
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}
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}
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current_block_byte += 2;
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if (current_block_byte >= area_end)
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current_block_byte = 0;
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}
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else {
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ret_data = AtaBaseDevice::get_data();
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}
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return ret_data;
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}
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void AtapiCdrom::status_good() {
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this->status_expected = true;
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this->r_error = 0;
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this->sense_key = 0;
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this->r_status &= ~ATA_Status::ERR;
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}
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void AtapiCdrom::status_error(uint8_t sense_key, uint8_t asc) {
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this->status_expected = true;
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this->sense_key = sense_key;
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this->asc = asc;
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this->r_error = (sense_key << 4) | ATA_Error::ABRT;
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this->r_status |= ATA_Status::ERR;
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}
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static const PropMap AtapiCdromProperties = {
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{"cdr_img", new StrProperty("")},
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};
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static const DeviceDescription AtapiCdromDescriptor =
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{AtapiCdrom::create, {}, AtapiCdromProperties};
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REGISTER_DEVICE(AtapiCdrom, AtapiCdromDescriptor);
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