src/main/java/com/loomcom/symon/machines/SymonMachine.java

/*
 * Copyright (c) 2014 Seth J. Morabito <web@loomcom.com>
 *                    Maik Merten <maikmerten@googlemail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package com.loomcom.symon.machines;

import com.loomcom.symon.Bus;
import com.loomcom.symon.Cpu;
import com.loomcom.symon.devices.*;
import com.loomcom.symon.exceptions.MemoryRangeException;

import java.io.File;
import java.io.InputStream;
import java.util.logging.Logger;

public class SymonMachine implements Machine {

	private final static Logger logger = Logger.getLogger(SymonMachine.class.getName());

	// Constants used by the simulated system. These define the memory map.
	private static final int BUS_BOTTOM = 0x0000;
	private static final int BUS_TOP = 0xffff;

	// 32K of RAM from $0000 - $7FFF
	private static final int MEMORY_BASE = 0x0000;
	private static final int MEMORY_SIZE = 0x8000;

	// PIA at $8000-$800F

	private static final int PIA_BASE = 0x8000;

	// ACIA at $8800-$8803
	private static final int ACIA_BASE = 0x8800;

	// 16KB ROM at $C000-$FFFF
	private static final int ROM_BASE = 0xC000;
	private static final int ROM_SIZE = 0x4000;

	// The simulated peripherals
	private final Bus bus;
	private final Cpu cpu;
	private final Acia acia;
	private final Pia pia;
	private final Memory ram;
	private Memory rom;

	public SymonMachine() throws Exception {
		this.bus = new Bus(BUS_BOTTOM, BUS_TOP);
		this.cpu = new Cpu();
		this.ram = new Memory(MEMORY_BASE, MEMORY_BASE + MEMORY_SIZE - 1, false);
		this.pia = new Via6522(PIA_BASE);
		this.acia = new Acia6551(ACIA_BASE);

		bus.addCpu(cpu);
		bus.addDevice(ram);
		bus.addDevice(pia);
		bus.addDevice(acia);

		// TODO: Make this configurable, of course.
		InputStream romImage = this.getClass().getResourceAsStream("/assets/ocsymon/roms/boot.rom");
		if (romImage != null) {
			logger.info("Loading ROM image from file: boot.rom");
			this.rom = Memory.makeROM(ROM_BASE, ROM_BASE + ROM_SIZE - 1, romImage);
		} else {
			logger.info("Default ROM file \"boot.rom\" not found.");
			throw new Exception("boot.rom not found");
		}

		bus.addDevice(rom);

	}

	@Override
	public Bus getBus() {
		return bus;
	}

	@Override
	public Cpu getCpu() {
		return cpu;
	}

	@Override
	public Memory getRam() {
		return ram;
	}

	@Override
	public Acia getAcia() {
		return acia;
	}

	@Override
	public Pia getPia() {
		return pia;
	}

	@Override
	public Memory getRom() {
		return rom;
	}

	public void setRom(Memory rom) throws MemoryRangeException {
		if (this.rom != null) {
			bus.removeDevice(this.rom);
		}
		this.rom = rom;
		bus.addDevice(this.rom);
	}

	@Override
	public int getRomBase() {
		return ROM_BASE;
	}

	@Override
	public int getRomSize() {
		return ROM_SIZE;
	}

	@Override
	public int getMemorySize() {
		return MEMORY_SIZE;
	}

	@Override
	public String getName() {
		return "Symon";
	}

}