/*
* 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.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;
// CRTC at $9000-$9001
private static final int CRTC_BASE = 0x9000;
// 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 Crtc crtc;
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);
this.crtc = new Crtc(CRTC_BASE, ram);
bus.addCpu(cpu);
bus.addDevice(ram);
bus.addDevice(pia);
bus.addDevice(acia);
bus.addDevice(crtc);
// TODO: Make this configurable, of course.
File romImage = new File("rom.bin");
if (romImage.canRead()) {
logger.info("Loading ROM image from file " + romImage);
this.rom = Memory.makeROM(ROM_BASE, ROM_BASE + ROM_SIZE - 1, romImage);
} else {
logger.info("Default ROM file " + romImage +
" not found, loading empty R/W memory image.");
this.rom = Memory.makeRAM(ROM_BASE, ROM_BASE + ROM_SIZE - 1);
}
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 Crtc getCrtc() {
return crtc;
}
@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";
}
}