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dingusppc/devices/common/scsi/scsicdrom.cpp

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** @file SCSI CD-ROM emulation. */
#include <devices/common/scsi/scsi.h>
#include <devices/common/scsi/scsicdrom.h>
#include <devices/deviceregistry.h>
#include <loguru.hpp>
#include <machines/machineproperties.h>
#include <memaccess.h>
#include <cinttypes>
#include <cstring>
using namespace std;
static char cdrom_vendor_sony_id[] = "SONY ";
static char cdu8003a_product_id[] = "CD-ROM CDU-8003A";
static char cdu8003a_revision_id[] = "1.9a";
ScsiCdrom::ScsiCdrom(int my_id) : ScsiDevice(my_id)
{
supports_types(HWCompType::SCSI_DEV);
this->sector_size = 2048;
this->pre_xfer_action = nullptr;
this->post_xfer_action = nullptr;
}
void ScsiCdrom::insert_image(std::string filename)
{
if (!this->cdr_img.open(filename)) {
ABORT_F("SCSI-CDROM: could not open image file");
}
this->img_size = this->cdr_img.size();
this->total_frames = (this->img_size + this->sector_size - 1) / this->sector_size;
// create single track descriptor
this->tracks[0] = {.trk_num = 1, .adr_ctrl = 0x14, .start_lba = 0};
this->num_tracks = 1;
// create Lead-out descriptor containing all data
this->tracks[1] = {.trk_num = LEAD_OUT_TRK_NUM, .adr_ctrl = 0x14,
.start_lba = static_cast<uint32_t>(this->total_frames)};
}
void ScsiCdrom::process_command()
{
uint32_t lba, xfer_len;
this->pre_xfer_action = nullptr;
this->post_xfer_action = nullptr;
// assume successful command execution
this->status = ScsiStatus::GOOD;
switch (cmd_buf[0]) {
case ScsiCommand::TEST_UNIT_READY:
this->switch_phase(ScsiPhase::STATUS);
break;
case ScsiCommand::READ_6:
lba = ((cmd_buf[1] & 0x1F) << 16) + (cmd_buf[2] << 8) + cmd_buf[3];
this->read(lba, cmd_buf[4], 6);
break;
case ScsiCommand::INQUIRY:
this->inquiry();
break;
case ScsiCommand::MODE_SELECT_6:
this->incoming_size = this->cmd_buf[4];
this->switch_phase(ScsiPhase::DATA_OUT);
break;
case ScsiCommand::MODE_SENSE_6:
this->mode_sense();
break;
case ScsiCommand::PREVENT_ALLOW_MEDIUM_REMOVAL:
this->eject_allowed = (this->cmd_buf[4] & 1) == 0;
this->switch_phase(ScsiPhase::STATUS);
break;
case ScsiCommand::READ_CAPACITY_10:
this->read_capacity();
break;
case ScsiCommand::READ_10:
lba = READ_DWORD_BE_U(&this->cmd_buf[2]);
xfer_len = READ_WORD_BE_U(&this->cmd_buf[7]);
if (this->cmd_buf[1] & 1) {
ABORT_F("SCSI-CDROM: RelAdr bit set in READ_10");
}
read(lba, xfer_len, 10);
break;
case ScsiCommand::READ_TOC:
this->read_toc();
break;
default:
ABORT_F("SCSI_CDROM: unsupported command %d", this->cmd_buf[0]);
}
}
bool ScsiCdrom::prepare_data()
{
switch (this->cur_phase) {
case ScsiPhase::DATA_IN:
this->data_ptr = (uint8_t*)this->data_buf;
this->data_size = this->bytes_out;
break;
case ScsiPhase::DATA_OUT:
this->data_ptr = (uint8_t*)this->data_buf;
this->data_size = 0;
break;
case ScsiPhase::STATUS:
break;
default:
LOG_F(WARNING, "SCSI_CDROM: unexpected phase in prepare_data");
return false;
}
return true;
}
void ScsiCdrom::read(const uint32_t lba, const uint16_t transfer_len, const uint8_t cmd_len)
{
uint32_t transfer_size = transfer_len;
std::memset(this->data_buf, 0, sizeof(this->data_buf));
if (cmd_len == 6 && transfer_len == 0) {
transfer_size = 256;
}
transfer_size *= this->sector_size;
uint64_t device_offset = lba * this->sector_size;
this->cdr_img.read(this->data_buf, device_offset, transfer_size);
this->bytes_out = transfer_size;
this->msg_buf[0] = ScsiMessage::COMMAND_COMPLETE;
this->switch_phase(ScsiPhase::DATA_IN);
}
void ScsiCdrom::inquiry()
{
int page_num = cmd_buf[2];
int alloc_len = cmd_buf[4];
if (page_num) {
ABORT_F("SCSI_CDROM: invalid page number in INQUIRY");
}
if (alloc_len > 36) {
LOG_F(WARNING, "SCSI_CDROM: more than 36 bytes requested in INQUIRY");
}
this->data_buf[0] = 5; // device type: CD-ROM
this->data_buf[1] = 0x80; // removable media
this->data_buf[2] = 2; // ANSI version: SCSI-2
this->data_buf[3] = 1; // response data format
this->data_buf[4] = 0x1F; // additional length
this->data_buf[5] = 0;
this->data_buf[6] = 0;
this->data_buf[7] = 0x18; // supports synchronous xfers and linked commands
std::memcpy(&this->data_buf[8], cdrom_vendor_sony_id, 8);
std::memcpy(&this->data_buf[16], cdu8003a_product_id, 16);
std::memcpy(&this->data_buf[32], cdu8003a_revision_id, 4);
this->bytes_out = 36;
this->msg_buf[0] = ScsiMessage::COMMAND_COMPLETE;
this->switch_phase(ScsiPhase::DATA_IN);
}
static char Apple_Copyright_Page_Data[] = "APPLE COMPUTER, INC ";
void ScsiCdrom::mode_sense()
{
uint8_t page_code = this->cmd_buf[2] & 0x3F;
uint8_t alloc_len = this->cmd_buf[4];
int num_blocks = (this->img_size + this->sector_size) / this->sector_size;
this->data_buf[ 0] = 13; // initial data size
this->data_buf[ 1] = 0; // medium type
this->data_buf[ 2] = 0x80; // medium is write protected
this->data_buf[ 3] = 8; // block description length
this->data_buf[ 4] = 0; // density code
this->data_buf[ 5] = (num_blocks >> 16) & 0xFFU;
this->data_buf[ 6] = (num_blocks >> 8) & 0xFFU;
this->data_buf[ 7] = (num_blocks ) & 0xFFU;
this->data_buf[ 8] = 0;
this->data_buf[ 9] = 0;
this->data_buf[10] = (this->sector_size >> 8) & 0xFFU;
this->data_buf[11] = (this->sector_size ) & 0xFFU;
this->data_buf[12] = page_code;
switch (page_code) {
case 0x01:
this->data_buf[13] = 6; // data size
std::memset(&this->data_buf[14], 0, 6);
this->data_buf[0] += 7;
break;
case 0x30:
this->data_buf[13] = 22; // data size
std::memcpy(&this->data_buf[14], Apple_Copyright_Page_Data, 22);
this->data_buf[0] += 23;
break;
default:
ABORT_F("SCSI-HD: unsupported page %d in MODE_SENSE_6", page_code);
}
this->bytes_out = this->data_buf[0];
this->msg_buf[0] = ScsiMessage::COMMAND_COMPLETE;
this->switch_phase(ScsiPhase::DATA_IN);
}
void ScsiCdrom::read_toc()
{
int tot_tracks;
uint8_t start_track = this->cmd_buf[6];
uint16_t alloc_len = (this->cmd_buf[7] << 8) + this->cmd_buf[8];
bool is_msf = !!(this->cmd_buf[1] & 2);
if (this->cmd_buf[2] & 0xF) {
ABORT_F("SCSI-CDROM: unsupported format in READ_TOC");
}
if (!alloc_len) {
LOG_F(WARNING, "SCSI-CDROM: zero allocation length passed to READ_TOC");
return;
}
if (!start_track) { // special case: track zero (lead-in) as starting track
// return all tracks starting with track 1 plus lead-out
start_track = 1;
tot_tracks = this->num_tracks + 1;
} else if (start_track == LEAD_OUT_TRK_NUM) {
start_track = this->num_tracks + 1;
tot_tracks = 1;
} else if (start_track <= this->num_tracks) {
tot_tracks = (this->num_tracks - start_track) + 2;
} else {
LOG_F(ERROR, "SCSI-CDROM: invalid starting track %d in READ_TOC", start_track);
this->status = ScsiStatus::CHECK_CONDITION;
this->sense = ScsiSense::ILLEGAL_REQ;
this->switch_phase(ScsiPhase::STATUS);
return;
}
char* buf_ptr = this->data_buf;
int data_len = (tot_tracks * 8) + 2;
// write TOC data header
*buf_ptr++ = (data_len >> 8) & 0xFFU;
*buf_ptr++ = (data_len >> 0) & 0xFFU;
*buf_ptr++ = 1; // 1st track number
*buf_ptr++ = this->num_tracks; // last track number
for (int tx = 0; tx < tot_tracks; tx++) {
if ((buf_ptr - this->data_buf + 8) > alloc_len)
break; // exit the loop if the output buffer length is exhausted
TrackDescriptor& td = this->tracks[start_track + tx - 1];
*buf_ptr++ = 0; // reserved
*buf_ptr++ = td.adr_ctrl;
*buf_ptr++ = td.trk_num;
*buf_ptr++ = 0; // reserved
if (is_msf) {
AddrMsf msf = lba_to_msf(td.start_lba + 150);
*buf_ptr++ = 0; // reserved
*buf_ptr++ = msf.min;
*buf_ptr++ = msf.sec;
*buf_ptr++ = msf.frm;
} else {
*buf_ptr++ = (td.start_lba >> 24) & 0xFFU;
*buf_ptr++ = (td.start_lba >> 16) & 0xFFU;
*buf_ptr++ = (td.start_lba >> 8) & 0xFFU;
*buf_ptr++ = (td.start_lba >> 0) & 0xFFU;
}
}
this->bytes_out = alloc_len;
this->msg_buf[0] = ScsiMessage::COMMAND_COMPLETE;
this->switch_phase(ScsiPhase::DATA_IN);
}
void ScsiCdrom::read_capacity()
{
uint32_t lba = READ_DWORD_BE_U(&this->cmd_buf[2]);
if (this->cmd_buf[1] & 1) {
ABORT_F("SCSI-CDROM: RelAdr bit set in READ_CAPACITY_10");
}
if (!(this->cmd_buf[8] & 1) && lba) {
LOG_F(ERROR, "SCSI-CDROM: non-zero LBA for PMI=0");
this->status = ScsiStatus::CHECK_CONDITION;
this->sense = ScsiSense::ILLEGAL_REQ;
this->switch_phase(ScsiPhase::STATUS);
return;
}
int last_lba = this->total_frames - 1;
this->data_buf[0] = (last_lba >> 24) & 0xFFU;
this->data_buf[1] = (last_lba >> 16) & 0xFFU;
this->data_buf[2] = (last_lba >> 8) & 0xFFU;
this->data_buf[3] = (last_lba >> 0) & 0xFFU;
this->data_buf[4] = 0;
this->data_buf[5] = 0;
this->data_buf[6] = (this->sector_size >> 8) & 0xFFU;
this->data_buf[7] = this->sector_size & 0xFFU;
this->bytes_out = 8;
this->msg_buf[0] = ScsiMessage::COMMAND_COMPLETE;
this->switch_phase(ScsiPhase::DATA_IN);
}
AddrMsf ScsiCdrom::lba_to_msf(const int lba)
{
return {.min = lba / 4500, .sec = (lba / 75) % 60, .frm = lba % 75};
}
static const PropMap ScsiCdromProperties = {
{"cdr_img", new StrProperty("")},
};
static const DeviceDescription ScsiCdromDescriptor =
{ScsiCdrom::create, {}, ScsiCdromProperties};
REGISTER_DEVICE(ScsiCdrom, ScsiCdromDescriptor);
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