mirror of
https://github.com/badvision/lawless-legends.git
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127 lines
5.1 KiB
Java
127 lines
5.1 KiB
Java
/**
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* Copyright 2024 Brendan Robert
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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package jace.hardware;
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import java.io.IOException;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import jace.Emulator;
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import jace.apple2e.MOS65C02;
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import jace.core.RAM;
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import jace.hardware.massStorage.CardMassStorage;
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/**
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* Generic abstraction of a smartport device.
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* @author Brendan Robert (BLuRry) brendan.robert@gmail.com
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*/
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public abstract class SmartportDriver {
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public enum ERROR_CODE {
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NO_ERROR(0), INVALID_COMMAND(0x01), BAD_PARAM_COUNT(0x04), INVALID_UNIT(0x011), INVALID_CODE(0x021), BAD_BLOCK_NUMBER(0x02d);
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int intValue;
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ERROR_CODE(int c) {
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intValue = c;
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}
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}
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public void handleSmartport() {
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Emulator.withComputer(computer -> {
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int returnCode = callSmartport().intValue;
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MOS65C02 cpu = (MOS65C02) computer.getCpu();
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cpu.A = returnCode;
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// Clear carry flag if no error, otherwise set carry flag
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cpu.C = (returnCode == 0x00) ? 0 : 1;
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});
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}
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private ERROR_CODE callSmartport() {
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return Emulator.withComputer(computer -> {
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MOS65C02 cpu = (MOS65C02) computer.getCpu();
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RAM ram = computer.getMemory();
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int callAddress = cpu.popWord() + 1;
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int command = ram.readRaw(callAddress);
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boolean extendedCall = command >= 0x040;
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// command &= 0x0f;
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// Modify stack so that RTS goes to the right place after the smartport device call
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// Kludge due to the CPU not getting the faked RTS opcode
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cpu.setProgramCounter(callAddress + (extendedCall ? 4 : 2));
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// Calculate parameter address block
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int parmAddr;
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if (!extendedCall) {
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parmAddr = ram.readWordRaw(callAddress + 1);
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} else {
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// Extended calls -- not gonna happen on this platform anyway
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int parmAddrLo = ram.readWordRaw(callAddress + 1);
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int parmAddrHi = ram.readWordRaw(callAddress + 3);
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parmAddr = parmAddrHi << 16 | parmAddrLo;
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}
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// Now process command
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// System.out.println(String.format("Received %s command %d with address block %s", (extendedCall ? "extended" : "normal"), command, Integer.toHexString(parmAddr)));
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// byte numParms = ram.readRaw(parmAddr);
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int[] params = new int[16];
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for (int i = 0; i < 16; i++) {
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int value = 0x0ff & ram.readRaw(parmAddr + i);
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params[i] = value;
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// System.out.print(Integer.toHexString(value) + " ");
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}
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// System.out.println();
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int unitNumber = params[1];
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if (!changeUnit(unitNumber)) {
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System.out.println("Invalid unit: "+unitNumber);
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return ERROR_CODE.INVALID_UNIT;
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}
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int dataBuffer = params[2] | (params[3] << 8);
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try {
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switch (command) {
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case 0: //Status
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return returnStatus(dataBuffer, params);
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case 1: //Read Block
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int blockNum = params[4] | (params[5] << 8) | (params[6] << 16);
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read(blockNum, dataBuffer);
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// System.out.println("reading "+blockNum+" to $"+Integer.toHexString(dataBuffer));
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return ERROR_CODE.NO_ERROR;
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case 2: //Write Block
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blockNum = params[4] | (params[5] << 8) | (params[6] << 16);
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write(blockNum, dataBuffer);
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return ERROR_CODE.NO_ERROR;
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case 3: //Format
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case 4: //Control
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case 5: //Init
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case 6: //Open
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case 7: //Close
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case 8: //Read
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case 9: //Write
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default:
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System.out.println("Unimplemented command "+command);
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return ERROR_CODE.INVALID_COMMAND;
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}
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} catch (IOException ex) {
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Logger.getLogger(CardMassStorage.class.getName()).log(Level.SEVERE, null, ex);
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return ERROR_CODE.INVALID_CODE;
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}
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}, ERROR_CODE.NO_ERROR);
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}
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abstract public boolean changeUnit(int unitNumber);
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abstract public void read(int blockNum, int buffer) throws IOException;
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abstract public void write(int blockNum, int buffer) throws IOException;
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abstract public ERROR_CODE returnStatus(int dataBuffer, int[] params);
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}
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