mirror of
https://github.com/dingusdev/dingusppc.git
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3978d0754d
The code does not support more than 2^32 - 2 blocks because of this expression: static_cast<uint32_t>(this->size_blocks + 1)
286 lines
9.7 KiB
C++
286 lines
9.7 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 device implementation. */
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#include <devices/common/scsi/scsi.h> // reuse SCSI definitions
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#include <devices/storage/cdromdrive.h>
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#include <loguru.hpp>
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#include <memaccess.h>
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#include <cinttypes>
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#include <cstring>
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#include <string>
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CdromDrive::CdromDrive() : BlockStorageDevice(31, 2048, 0xfffffffe) {
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this->is_writeable = false;
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}
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void CdromDrive::insert_image(std::string filename) {
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this->set_host_file(filename);
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// create single track descriptor
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this->tracks[0] = {1, /*.trk_num*/ 0x14, /*.adr_ctrl*/ 0 /*.start_lba*/};
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this->num_tracks = 1;
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// create Lead-out descriptor containing all data
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this->tracks[1] = {LEAD_OUT_TRK_NUM, /*.trk_num*/ 0x14, /*.adr_ctrl*/
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static_cast<uint32_t>(this->size_blocks + 1) /*.start_lba*/};
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}
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static char cdrom_vendor_dingus_id[] = "DINGUS ";
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static char cdrom_product_id[] = "DINGUS CD-ROM ";
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static char cdrom_revision_id[] = "1.0 ";
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uint32_t CdromDrive::inquiry(uint8_t *cmd_ptr, uint8_t *data_ptr) {
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uint8_t alloc_len = cmd_ptr[4];
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if (alloc_len > 36) {
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LOG_F(WARNING, "CD-ROM: more than 36 bytes requested in INQUIRY");
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}
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data_ptr[0] = 5; // device type: CD-ROM
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data_ptr[1] = 0x80; // removable media
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data_ptr[2] = 2; // ANSI version: SCSI-2
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data_ptr[3] = 0x21; // ATAPI Version + response data format
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data_ptr[4] = 0x1F; // additional length
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data_ptr[5] = 0;
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data_ptr[6] = 0;
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data_ptr[7] = 0;
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std::memcpy(&data_ptr[8], cdrom_vendor_dingus_id, 8);
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std::memcpy(&data_ptr[16], cdrom_product_id, 16);
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std::memcpy(&data_ptr[32], cdrom_revision_id, 4);
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return 36;
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}
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uint32_t CdromDrive::mode_sense_ex(uint8_t *cmd_ptr, uint8_t *data_ptr) {
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uint8_t *resp_ptr;
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uint8_t page_code = cmd_ptr[2] & 0x3F;
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uint8_t alloc_len = READ_WORD_BE_U(&cmd_ptr[7]);
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std::memset(data_ptr, 0, alloc_len);
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data_ptr[0] = 0; // initial data size MSB
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data_ptr[1] = 6; // initial data size LSB
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data_ptr[2] = 1; // medium type: 120mm CD-ROM
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data_ptr[3] = 0; // device-specific parameter
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data_ptr[4] = 0;
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data_ptr[5] = 0;
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data_ptr[6] = 0; // block description length MSB
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data_ptr[7] = 0; // block description length LSB
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resp_ptr = data_ptr + 8;
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resp_ptr[0] = page_code;
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switch (page_code) {
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case 0x01:
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resp_ptr[1] = 6; // data size
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std::memset(&resp_ptr[2], 0, 6);
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data_ptr[1] += 8; // adjust overall length
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break;
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case 0x2A:
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resp_ptr[1] = 18; // page data length
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std::memset(&resp_ptr[2], 0, 18);
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resp_ptr[2] = 0x03; // supports reading CD-R and CD-E
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resp_ptr[3] = 0x00; // doesn't support writing to CD-R and CD-E
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resp_ptr[6] = (1 << 5) | (1 << 3) | (1 << 0); // tray type + eject + lock support
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WRITE_WORD_BE_A(&resp_ptr[ 8], 706); // report 4x speed
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WRITE_WORD_BE_A(&resp_ptr[10], 2); // supports audio on/off only
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WRITE_WORD_BE_A(&resp_ptr[12], 512); // 512Kb cache
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WRITE_WORD_BE_A(&resp_ptr[14], 706); // report current speed (4x)
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data_ptr[1] += 20; // adjust overall length
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break;
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default:
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this->set_error(ScsiSense::ILLEGAL_REQ, ScsiError::INVALID_CDB);
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return 0;
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}
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return data_ptr[1] + 2; // return total response length
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}
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uint32_t CdromDrive::request_sense(uint8_t *data_ptr, uint8_t sense_key,
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uint8_t asc, uint8_t ascq) {
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std::memset(data_ptr, 0, 18);
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data_ptr[ 0] = 0x80 | 0x70; // valid + current error
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data_ptr[ 2] = sense_key;
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data_ptr[ 7] = 10; // additional sense length
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data_ptr[12] = asc;
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data_ptr[13] = ascq;
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return 18;
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}
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uint32_t CdromDrive::report_capacity(uint8_t *data_ptr) {
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WRITE_DWORD_BE_A(data_ptr, static_cast<uint32_t>(this->size_blocks));
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WRITE_DWORD_BE_A(&data_ptr[4], this->block_size);
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return 8;
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}
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AddrMsf CdromDrive::lba_to_msf(const int lba) {
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return {lba / 4500, /*.min*/ (lba / 75) % 60, /*.sec*/ lba % 75 /*.frm*/};
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}
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uint32_t CdromDrive::read_toc(uint8_t *cmd_ptr, uint8_t *data_ptr) {
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int tot_tracks, data_len;
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uint8_t start_track, session_num;
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uint8_t* out_ptr;
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uint16_t alloc_len = READ_WORD_BE_U(&cmd_ptr[7]);
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bool is_msf = !!(cmd_ptr[1] & 2);
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// ATAPI specific handling of the format field
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uint8_t format = cmd_ptr[2] & 7;
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if (!format) {
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format = cmd_ptr[9] >> 6;
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}
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if (!alloc_len)
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return 0;
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switch(format) {
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case 0: // Formatted TOC
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start_track = cmd_ptr[6];
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if (!start_track) { // special case: track zero (lead-in) as starting track
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// return all tracks starting with track 1 plus lead-out
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start_track = 1;
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tot_tracks = this->num_tracks + 1;
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} else if (start_track == LEAD_OUT_TRK_NUM) {
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start_track = this->num_tracks + 1;
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tot_tracks = 1;
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} else if (start_track <= this->num_tracks) {
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tot_tracks = (this->num_tracks - start_track) + 2;
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} else {
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LOG_F(ERROR, "CDROM: invalid starting track %d in READ_TOC", start_track);
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this->set_error(ScsiSense::ILLEGAL_REQ, ScsiError::INVALID_CDB);
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return 0;
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}
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out_ptr = data_ptr;
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data_len = (tot_tracks * 8) + 4;
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// write TOC data header
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WRITE_WORD_BE_A(out_ptr, data_len - 2);
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out_ptr[2] = 1; // 1st track number
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out_ptr[3] = this->num_tracks; // last track number
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out_ptr += 4;
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for (int tx = 0; tx < tot_tracks; tx++) {
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if ((out_ptr - data_ptr + 8) > alloc_len)
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break; // exit the loop if the output buffer length is exhausted
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TrackDescriptor& td = this->tracks[start_track + tx - 1];
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*out_ptr++ = 0; // reserved
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*out_ptr++ = td.adr_ctrl;
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*out_ptr++ = td.trk_num;
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*out_ptr++ = 0; // reserved
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if (is_msf) {
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AddrMsf msf = lba_to_msf(td.start_lba + 150);
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*out_ptr++ = 0; // reserved
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*out_ptr++ = msf.min;
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*out_ptr++ = msf.sec;
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*out_ptr++ = msf.frm;
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} else {
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WRITE_DWORD_BE_A(out_ptr, td.start_lba);
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out_ptr += 4;
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}
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}
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return data_len;
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case 1: // Multi-session info
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std::memset(data_ptr, 0, 12);
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data_ptr[1] = 10; // TOC data length
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data_ptr[2] = 1; // first session number
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data_ptr[3] = 1; // last session number
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data_ptr[5] = this->tracks[0].adr_ctrl;
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data_ptr[6] = 1;
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if (is_msf) {
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AddrMsf msf = lba_to_msf(this->tracks[0].start_lba + 150);
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data_ptr[ 8] = 0; // reserved
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data_ptr[ 9] = msf.min;
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data_ptr[10] = msf.sec;
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data_ptr[11] = msf.frm;
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}
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return 12;
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case 2: // Raw TOC
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session_num = cmd_ptr[6];
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if (!session_num)
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session_num = 1;
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if (session_num > 1) {
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LOG_F(ERROR, "CDROM: invalid session number %d", session_num);
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this->set_error(ScsiSense::ILLEGAL_REQ, ScsiError::INVALID_CDB);
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return 0;
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}
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std::memset(data_ptr, 0, 48);
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out_ptr = data_ptr;
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// prepare data header
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out_ptr[1] = 46; // TOC data length
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out_ptr[2] = 1; // first session number
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out_ptr[3] = 1; // last session number
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out_ptr += 4;
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// descriptor #1 -> first track
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out_ptr[0] = session_num;
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out_ptr[1] = this->tracks[0].adr_ctrl;
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out_ptr[3] = 0xA0; // point -> first track
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out_ptr[8] = 1; // first track number
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out_ptr += 11;
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// descriptor #2 -> last track
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out_ptr[0] = session_num;
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out_ptr[1] = this->tracks[0].adr_ctrl;
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out_ptr[3] = 0xA1; // point -> last track
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out_ptr[8] = 1; // last track number
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out_ptr += 11;
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// descriptor #3 -> lead-out
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out_ptr[0] = session_num;
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out_ptr[1] = this->tracks[0].adr_ctrl;
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out_ptr[3] = 0xA2; // point -> lead-out
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if (is_msf) {
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AddrMsf msf = lba_to_msf(this->tracks[1].start_lba + 150);
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out_ptr[ 7] = 0; // reserved
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out_ptr[ 8] = msf.min;
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out_ptr[ 9] = msf.sec;
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out_ptr[10] = msf.frm;
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} else {
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WRITE_DWORD_BE_U(&out_ptr[7], this->tracks[1].start_lba);
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}
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out_ptr += 11;
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// descriptor #4 -> data track
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out_ptr[0] = session_num;
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out_ptr[1] = this->tracks[0].adr_ctrl;
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out_ptr[3] = 1; // point -> data track
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if (is_msf) {
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AddrMsf msf = lba_to_msf(this->tracks[0].start_lba + 150);
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out_ptr[ 7] = 0; // reserved
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out_ptr[ 8] = msf.min;
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out_ptr[ 9] = msf.sec;
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out_ptr[10] = msf.frm;
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}
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return 48;
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default:
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LOG_F(ERROR, "CDROM: unsupported format in READ_TOC");
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this->set_error(ScsiSense::ILLEGAL_REQ, ScsiError::INVALID_CDB);
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return 0;
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}
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}
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