mirror of https://github.com/sethm/symon.git
171 lines
4.7 KiB
Java
171 lines
4.7 KiB
Java
/*
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* Copyright (c) 2008-2014 Seth J. Morabito <web@loomcom.com>
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* Maik Merten <maikmerten@googlemail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package com.loomcom.symon.machines;
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import com.loomcom.symon.Bus;
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import com.loomcom.symon.Cpu;
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import com.loomcom.symon.devices.Acia;
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import com.loomcom.symon.devices.Acia6551;
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import com.loomcom.symon.devices.Crtc;
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import com.loomcom.symon.devices.Memory;
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import com.loomcom.symon.devices.Via;
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import com.loomcom.symon.exceptions.MemoryRangeException;
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import java.io.File;
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import java.util.logging.Logger;
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public class SymonMachine implements Machine {
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private final static Logger logger = Logger.getLogger(SymonMachine.class.getName());
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// Constants used by the simulated system. These define the memory map.
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private static final int BUS_BOTTOM = 0x0000;
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private static final int BUS_TOP = 0xffff;
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// 32K of RAM from $0000 - $7FFF
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private static final int MEMORY_BASE = 0x0000;
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private static final int MEMORY_SIZE = 0x8000;
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// VIA at $8000-$800F
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private static final int VIA_BASE = 0x8000;
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// ACIA at $8800-$8803
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private static final int ACIA_BASE = 0x8800;
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// CRTC at $9000-$9001
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private static final int CRTC_BASE = 0x9000;
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private static final int VIDEO_RAM_BASE = 0x7000;
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// 16KB ROM at $C000-$FFFF
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private static final int ROM_BASE = 0xC000;
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private static final int ROM_SIZE = 0x4000;
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// The simulated peripherals
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private final Bus bus;
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private final Cpu cpu;
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private final Acia acia;
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private final Via via;
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private final Crtc crtc;
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private final Memory ram;
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private Memory rom;
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public SymonMachine() throws Exception {
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this.bus = new Bus(BUS_BOTTOM, BUS_TOP);
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this.cpu = new Cpu();
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this.ram = new Memory(MEMORY_BASE, MEMORY_BASE + MEMORY_SIZE - 1, false);
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this.via = new Via(VIA_BASE);
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this.acia = new Acia6551(ACIA_BASE);
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this.crtc = new Crtc(CRTC_BASE, ram);
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bus.addCpu(cpu);
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bus.addDevice(ram);
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bus.addDevice(via);
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bus.addDevice(acia);
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bus.addDevice(crtc);
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// TODO: Make this configurable, of course.
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File romImage = new File("rom.bin");
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if (romImage.canRead()) {
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logger.info("Loading ROM image from file " + romImage);
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this.rom = Memory.makeROM(ROM_BASE, ROM_BASE + ROM_SIZE - 1, romImage);
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} else {
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logger.info("Default ROM file " + romImage +
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" not found, loading empty R/W memory image.");
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this.rom = Memory.makeRAM(ROM_BASE, ROM_BASE + ROM_SIZE - 1);
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}
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bus.addDevice(rom);
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}
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@Override
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public Bus getBus() {
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return bus;
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}
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@Override
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public Cpu getCpu() {
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return cpu;
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}
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@Override
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public Memory getRam() {
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return ram;
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}
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@Override
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public Acia getAcia() {
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return acia;
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}
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@Override
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public Via getVia() {
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return via;
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}
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@Override
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public Crtc getCrtc() {
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return crtc;
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}
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@Override
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public Memory getRom() {
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return rom;
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}
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public void setRom(Memory rom) throws MemoryRangeException {
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if(this.rom != null) {
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bus.removeDevice(this.rom);
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}
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this.rom = rom;
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bus.addDevice(this.rom);
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}
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@Override
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public int getRomBase() {
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return ROM_BASE;
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}
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@Override
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public int getRomSize() {
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return ROM_SIZE;
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}
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@Override
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public int getMemorySize() {
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return MEMORY_SIZE;
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}
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@Override
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public String getName() {
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return "Symon";
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}
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}
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