Zack Buhman
10d17d3c98
This combines my iso9660 parsing code, with all of the prior gdrom packet interface / command code. The example, on real Dreamcast hardware, displays the first 2048 bytes [1] of every file in the root directory on the serial console. [1] or the size of the file, whichever is smaller
214 lines
6.7 KiB
C++
214 lines
6.7 KiB
C++
#include <cstdint>
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#include "memorymap.hpp"
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#include "systembus.hpp"
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#include "sh7091/serial.hpp"
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#include "gdrom/gdrom.hpp"
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#include "gdrom/gdrom_bits.hpp"
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#include "gdrom/command_packet_format.hpp"
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#include "gdrom/toc.hpp"
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#include "iso9660/primary_volume_descriptor.hpp"
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#include "iso9660/directory_record.hpp"
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void pio_data(const uint8_t * data)
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{
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while ((gdrom::status::bsy(gdrom_if.status) | gdrom::status::drq(gdrom_if.status)) != 0);
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gdrom_if.features = gdrom::features::dma::disable;
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gdrom_if.drive_select = gdrom::drive_select::drive_select
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| gdrom::drive_select::lun(0);
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gdrom_if.command = gdrom::command::code::packet_command;
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while (gdrom::status::drq(gdrom_if.status) == 0);
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const uint16_t * buf = reinterpret_cast<const uint16_t *>(&data[0]);
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for (int i = 0; i < 6; i++) {
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gdrom_if.data = buf[i];
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}
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while (gdrom::status::bsy(gdrom_if.status) != 0);
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}
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void read_data(uint16_t * buf, const uint32_t length)
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{
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serial::string("read_data drq interrupt_reason: ");
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serial::integer<uint8_t>(gdrom::status::drq(gdrom_if.status), ' ');
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serial::integer<uint8_t>(gdrom_if.interrupt_reason);
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for (uint32_t i = 0; i < (length / 2); i++) {
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buf[i] = gdrom_if.data;
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}
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}
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uint32_t toc__get_data_track_fad()
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{
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auto packet = gdrom_command_packet_format::get_toc(0, // single-density
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0x0198 // maximum toc length
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);
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serial::string("get_toc\n");
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pio_data(packet._data());
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serial::string("byte_count: ");
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serial::integer<uint16_t>(gdrom_if.byte_count());
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uint16_t buf[gdrom_if.byte_count() / 2];
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read_data(buf, gdrom_if.byte_count());
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serial::string("status: ");
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serial::integer<uint8_t>(gdrom_if.status);
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auto toc = reinterpret_cast<const struct gdrom_toc::toc *>(buf);
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for (int i = 0; i < 99; i++) {
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if (toc->track[i].fad() == 0xffffff)
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break;
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serial::string("track ");
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serial::integer<uint8_t>(i);
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serial::integer<uint32_t>(toc->track[i].fad());
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}
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// assume track 1 is the correct track
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return toc->track[1].fad();
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}
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uint32_t cd_read(uint16_t * buf,
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const uint32_t starting_address,
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const uint32_t transfer_length)
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{
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const uint8_t data_select = 0b0010; // data
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const uint8_t expected_data_type = 0b100; // XA mode 2 form 1
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const uint8_t parameter_type = 0b0; // FAD specified
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const uint8_t data = (data_select << 4) | (expected_data_type << 1) | (parameter_type << 0);
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auto packet = gdrom_command_packet_format::cd_read(data,
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starting_address,
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transfer_length);
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auto arst = packet._data();
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serial::string("cd_read\n");
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serial::string("starting_address: ");
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serial::integer<uint32_t>(starting_address);
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pio_data(packet._data());
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uint32_t length = 0;
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while ((gdrom::status::drq(gdrom_if.status)) != 0) {
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const uint32_t byte_count = gdrom_if.byte_count();
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length += byte_count;
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read_data(buf, byte_count);
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}
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serial::string("status: ");
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serial::integer<uint8_t>(gdrom_if.status);
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serial::string("read length: ");
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serial::integer<uint32_t>(length);
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return length;
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}
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void main()
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{
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// gdrom unlock undocumented register
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g1_if.GDUNLOCK = 0x1fffff;
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// Without this read from system_boot_rom, the read value of
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// gdrom_if.status is always 0xff
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for(uint32_t i = 0; i < 0x200000 / 4; i++) {
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(void)system_boot_rom[i];
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}
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const uint32_t fad = toc__get_data_track_fad();
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serial::character('\n');
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const uint32_t primary_volume_descriptor = fad + 16;
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uint16_t buf[2048 / 2];
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const uint32_t length0 = cd_read(buf,
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primary_volume_descriptor,
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1 // one sector; 2048 bytes
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);
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serial::character('\n');
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auto pvd = reinterpret_cast<const iso9660::primary_volume_descriptor *>(&buf[0]);
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auto root_dr = reinterpret_cast<const iso9660::directory_record *>(&pvd->directory_record_for_root_directory[0]);
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serial::string("primary volume descriptor:\n");
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serial::string(" standard_identifier: ");
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serial::string(pvd->standard_identifier, 5);
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serial::character('\n');
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serial::string(" root directory record:\n");
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serial::string(" location of extent: ");
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serial::integer<uint32_t>(root_dr->location_of_extent.get());
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serial::string(" data length: ");
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serial::integer<uint32_t>(root_dr->data_length.get());
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serial::character('\n');
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/*
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for (int i = 0; i < 2048; i++) {
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serial::hexlify(buf8[i]);
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serial::character(' ');
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if ((i % 16) == 15)
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serial::character('\n');
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}
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*/
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serial::character('\n');
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const uint32_t root_directory_extent = root_dr->location_of_extent.get();
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const uint32_t length1 = cd_read(buf,
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root_directory_extent + 150, // 150?
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1 // one sector; 2048 bytes
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);
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serial::character('\n');
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auto buf8 = reinterpret_cast<const uint8_t *>(buf);
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uint32_t offset = 0;
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while (true) {
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serial::string("directory entry offset: ");
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serial::integer<uint32_t>(offset);
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auto dr = reinterpret_cast<const iso9660::directory_record *>(&buf8[offset]);
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if (dr->length_of_directory_record == 0)
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break;
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serial::string(" length_of_directory_record: ");
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serial::integer<uint8_t>(dr->length_of_directory_record);
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serial::string(" length_of_file_identifier: ");
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serial::integer<uint8_t>(dr->length_of_file_identifier);
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serial::string(" file_identifier: ");
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serial::string(dr->file_identifier, dr->length_of_file_identifier);
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serial::character('\n');
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if (dr->file_flags == 0) {
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serial::string(" location_of_extent: ");
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serial::integer<uint32_t>(dr->location_of_extent.get());
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serial::string(" data_length: ");
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serial::integer<uint32_t>(dr->data_length.get());
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if (dr->file_identifier[0] != '1') {
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const uint32_t extent = dr->location_of_extent.get();
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uint16_t buf2[2048 / 2];
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const uint32_t length1 = cd_read(buf2,
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extent + 150, // 150?
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1 // one sector; 2048 bytes
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);
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auto file = reinterpret_cast<const uint8_t *>(&buf2[0]);
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serial::string("---begin file content---\n");
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serial::string(file, dr->data_length.get());
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serial::string("---end file content---\n");
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}
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}
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offset += dr->length_of_directory_record;
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}
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serial::integer<uint32_t>(offset);
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while (1);
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}
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/*
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for (int i = 0; i < 12; i++) {
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serial::hexlify(arst[i]);
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serial::character(' ');
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}
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serial::character('\n');
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*/
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