First work toward moving to a Swing UI for the simulator.
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Seth Morabito committed
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@@ -1,6 +1,7 @@
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package com.loomcom.symon;
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import java.util.*;
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import com.loomcom.symon.devices.*;
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import com.loomcom.symon.exceptions.*;
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@@ -9,134 +10,140 @@ import com.loomcom.symon.exceptions.*;
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*/
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public class Bus {
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// By default, our bus starts at 0, and goes up to 64K
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private int startAddress = 0x0000;
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private int endAddress = 0xffff;
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// The CPU
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private Cpu cpu;
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// Ordered list of IO devices.
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private SortedSet<Device> devices;
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// By default, our bus starts at 0, and goes up to 64K
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private int startAddress = 0x0000;
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private int endAddress = 0xffff;
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// The CPU
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private Cpu cpu;
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// Ordered list of IO devices.
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private SortedSet<Device> devices;
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public Bus(int size) {
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this(0, size - 1);
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}
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public Bus(int size) {
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this(0, size - 1);
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}
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public Bus(int startAddress, int endAddress) {
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this.devices = new TreeSet<Device>();
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this.startAddress = startAddress;
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this.endAddress = endAddress;
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}
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public Bus(int startAddress, int endAddress) {
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this.devices = new TreeSet<Device>();
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this.startAddress = startAddress;
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this.endAddress = endAddress;
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}
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public int startAddress() {
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return startAddress;
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}
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public int startAddress() {
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return startAddress;
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}
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public int endAddress() {
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return endAddress;
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}
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public int endAddress() {
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return endAddress;
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}
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public void addDevice(Device device)
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public void addDevice(Device device)
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throws MemoryRangeException {
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// Make sure there's no memory overlap.
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MemoryRange memRange = device.getMemoryRange();
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for (Device d : devices) {
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if (d.getMemoryRange().overlaps(memRange)) {
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throw new MemoryRangeException("The device being added " +
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"overlaps with an existing " +
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"device.");
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}
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}
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// Add the device
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device.setBus(this);
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devices.add(device);
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}
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public void addCpu(Cpu cpu) {
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cpu.setBus(this);
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this.cpu = cpu;
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}
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/**
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* Returns true if the memory map is full, i.e., there are no
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* gaps between any IO devices. All memory locations map to some
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* device.
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*/
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public boolean isComplete() {
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// Empty maps cannot be complete.
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if (devices.isEmpty()) { return false; }
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// Loop over devices and ensure they are contiguous.
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MemoryRange prev = null;
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int i = 0;
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int length = devices.size();
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for (Device d : devices) {
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MemoryRange cur = d.getMemoryRange();
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if (i == 0) {
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// If the first entry doesn't start at 'startAddress', return false.
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if (cur.startAddress() != startAddress) { return false; }
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}
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if (prev != null && i < length - 1) {
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// Otherwise, compare previous map's end against this map's
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// endAddress. They must be adjacent!
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if (cur.startAddress() - 1 != prev.endAddress()) {
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return false;
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// Make sure there's no memory overlap.
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MemoryRange memRange = device.getMemoryRange();
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for (Device d : devices) {
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if (d.getMemoryRange().overlaps(memRange)) {
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throw new MemoryRangeException("The device being added " +
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"overlaps with an existing " +
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"device.");
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}
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}
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}
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if (i == length - 1) {
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// If the last entry doesn't end at endAddress, return false;
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if (cur.endAddress() != endAddress) { return false; }
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}
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i++;
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prev = cur;
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// Add the device
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device.setBus(this);
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devices.add(device);
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}
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// Must be complete.
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return true;
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}
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public int read(int address) throws MemoryAccessException {
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for (Device d : devices) {
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MemoryRange range = d.getMemoryRange();
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if (range.includes(address)) {
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// Compute offset into this device's address space.
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int devAddr = address - range.startAddress();
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return d.read(devAddr);
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}
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public void addCpu(Cpu cpu) {
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cpu.setBus(this);
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this.cpu = cpu;
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}
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throw new MemoryAccessException("Read failed! No device at address.");
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}
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public void write(int address, int value) throws MemoryAccessException {
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for (Device d : devices) {
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MemoryRange range = d.getMemoryRange();
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if (range.includes(address)) {
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// Compute offset into this device's address space.
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int devAddr = address - range.startAddress();
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d.write(devAddr, value);
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return;
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}
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/**
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* Returns true if the memory map is full, i.e., there are no
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* gaps between any IO devices. All memory locations map to some
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* device.
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*/
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public boolean isComplete() {
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// Empty maps cannot be complete.
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if (devices.isEmpty()) {
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return false;
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}
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// Loop over devices and ensure they are contiguous.
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MemoryRange prev = null;
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int i = 0;
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int length = devices.size();
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for (Device d : devices) {
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MemoryRange cur = d.getMemoryRange();
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if (i == 0) {
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// If the first entry doesn't start at 'startAddress', return false.
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if (cur.startAddress() != startAddress) {
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return false;
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}
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}
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if (prev != null && i < length - 1) {
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// Otherwise, compare previous map's end against this map's
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// endAddress. They must be adjacent!
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if (cur.startAddress() - 1 != prev.endAddress()) {
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return false;
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}
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}
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if (i == length - 1) {
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// If the last entry doesn't end at endAddress, return false;
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if (cur.endAddress() != endAddress) {
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return false;
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}
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}
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i++;
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prev = cur;
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}
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// Must be complete.
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return true;
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}
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throw new MemoryAccessException("Write failed! No device at address.");
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}
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public SortedSet<Device> getDevices() {
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// Expose a copy of the device list, not the original
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return new TreeSet<Device>(devices);
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}
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public Cpu getCpu() {
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return cpu;
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}
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public void loadProgram(int... program) throws MemoryAccessException {
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int address = getCpu().getProgramCounter();
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int i = 0;
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for (int d : program) {
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write(address + i++, d);
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public int read(int address) throws MemoryAccessException {
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for (Device d : devices) {
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MemoryRange range = d.getMemoryRange();
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if (range.includes(address)) {
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// Compute offset into this device's address space.
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int devAddr = address - range.startAddress();
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return d.read(devAddr);
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}
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}
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throw new MemoryAccessException("Read failed! No device at address.");
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}
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public void write(int address, int value) throws MemoryAccessException {
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for (Device d : devices) {
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MemoryRange range = d.getMemoryRange();
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if (range.includes(address)) {
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// Compute offset into this device's address space.
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int devAddr = address - range.startAddress();
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d.write(devAddr, value);
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return;
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}
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}
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throw new MemoryAccessException("Write failed! No device at address.");
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}
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public SortedSet<Device> getDevices() {
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// Expose a copy of the device list, not the original
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return new TreeSet<Device>(devices);
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}
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public Cpu getCpu() {
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return cpu;
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}
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public void loadProgram(int... program) throws MemoryAccessException {
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int address = getCpu().getProgramCounter();
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int i = 0;
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for (int d : program) {
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write(address + i++, d);
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}
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}
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}
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}
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