130 lines
3.8 KiB
Java
130 lines
3.8 KiB
Java
package example;
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import sega.dreamcast.gdrom.GdromProtocol;
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import sega.dreamcast.gdrom.G1IF;
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import java.misc.Memory;
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import filesystem.iso9660.VolumeParser;
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import filesystem.iso9660.ExtentReader;
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import filesystem.iso9660.DirectoryRecordHandler;
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import filesystem.iso9660.DirectoryRecord;
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import jvm.internal.Loader;
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class GdromExtentReader implements ExtentReader {
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public void readInto(byte[] buf, int extent) {
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int starting_address = extent + 150;
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System.out.print("starting_address: ");
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System.out.println(starting_address);
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GdromProtocol.cdReadPIO(buf, starting_address, 1);
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}
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}
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class GdromDirectoryRecordHandler implements DirectoryRecordHandler {
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int address;
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int[] addresses;
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public int addresses_ix;
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static byte[] class_ext;
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static {
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class_ext = new byte[] { 'C', 'L', 'A', ';', '1' }; // CLA;1
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}
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public GdromDirectoryRecordHandler(int address, int[] addresses) {
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this.address = address;
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this.addresses = addresses;
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this.addresses_ix = 0;
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}
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// transfer_length is in bytes
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public static void startG1DMA(int start_address, int transfer_length) {
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int gdstar = start_address & ~(0b111 << 29);
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Memory.putU4(G1IF.GDAPRO, 0x8843407F);
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Memory.putU4(G1IF.G1GDRC, 0x00001001);
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Memory.putU4(G1IF.GDSTAR, gdstar);
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Memory.putU4(G1IF.GDLEN, transfer_length);
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Memory.putU4(G1IF.GDDIR, 1);
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Memory.putU4(G1IF.GDEN, 1);
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Memory.putU4(G1IF.GDST, 1);
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}
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public boolean drIsClass(DirectoryRecord dr) {
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int length = dr.lengthOfFileIdentifier();
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if (length < 6)
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return false;
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byte[] buf = dr.array;
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int offset = dr.offset + DirectoryRecord.FILE_IDENTIFIER_START;
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int ix = 0;
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for (int i = length - 5; i < length; i++) {
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System.out.print(ix);
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System.out.print(" ");
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if (buf[offset + i] != class_ext[ix]) {
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return false;
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}
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ix += 1;
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}
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System.out.println();
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return true;
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}
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public void handle(DirectoryRecord dr) {
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int extent = dr.locationOfExtent(); // sector number
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int length = dr.dataLength(); // bytes
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if (drIsClass(dr)) {
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System.out.println("class found");
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} else {
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System.out.println("is not class");
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return;
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}
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// round up to nearest multiple of 2048
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length = (length + 2047) & ~(2047);
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System.out.print("start G1 DMA: address:");
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System.out.print(address);
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System.out.print(" length: ");
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System.out.println(length);
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System.out.println("read dma");
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Memory.putU4(G1IF.GDEN, 0);
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int sectors = length >> 11; // division by 2048
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GdromProtocol.cdReadDMA(extent + 150, sectors);
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System.out.println("start dma");
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startG1DMA(address, length);
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System.out.println("wait gdst");
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while ((Memory.getU4(G1IF.GDST) & 1) != 0);
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System.out.println("transfer complete");
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addresses[addresses_ix] = 0xa0000000 | address;
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addresses_ix += 1;
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address += length;
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}
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}
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class GdromTest {
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public static void main() {
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// assume gdrom is already unlocked
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int data_track_fad = GdromProtocol.tocGetDataTrackFad();
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int[] buffer_addresses = new int[0x3000]; // maximum 12,288 class files
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int loader_buffer_address = Loader.getBuffer();
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GdromDirectoryRecordHandler handler = new GdromDirectoryRecordHandler(loader_buffer_address, buffer_addresses);
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GdromExtentReader reader = new GdromExtentReader();
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VolumeParser parser = new VolumeParser(data_track_fad - 150, reader, handler);
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System.out.println("::parser parse::");
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parser.parse();
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Loader.load(buffer_addresses, handler.addresses_ix);
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}
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}
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