/// <summary>
/// Initializes arrays for memory banks, internal ram, and internal rom.
/// Must be called before running any operations.
/// </summary>
public void InitializeMemory()
{
m_CS_NoMMU = new Segment(SegmentIndex.CS, BUS, 0x80000000);
m_DS_NoMMU = new Segment(SegmentIndex.DS, BUS, 0x00000000);
m_ES_NoMMU = new Segment(SegmentIndex.ES, BUS, 0x00000000);
m_SS_NoMMU = new Segment(SegmentIndex.SS, BUS, 0x00000000);
m_IS_NoMMU = new Segment(SegmentIndex.IS, BUS, 0x80000000);
m_CSS = new Segment(SegmentIndex.CS, BUS, 0x80000000);
m_CSU = new Segment(SegmentIndex.CS, BUS, 0x80000000);
m_DSS = new Segment(SegmentIndex.DS, BUS, 0x00000000);
m_DSU = new Segment(SegmentIndex.DS, BUS, 0x00000000);
m_ESS = new Segment(SegmentIndex.ES, BUS, 0x00000000);
m_ESU = new Segment(SegmentIndex.ES, BUS, 0x00000000);
m_SSS = new Segment(SegmentIndex.SS, BUS, 0x00000000);
m_SSU = new Segment(SegmentIndex.SS, BUS, 0x00000000);
m_IS = new Segment(SegmentIndex.IS, BUS, 0x80000000);
}
/// <summary>
/// Returns the byte array of memory attached to the device. Accepts values from 0 - 16. Device 0 is ROM.
/// </summary>
internal void GetDeviceMemoryReference(Segment segment, ushort deviceIndex)
{
if (deviceIndex == 0) {
// request memory from ycpu
GetROMReference(segment);
}
else if (deviceIndex > 16) {
// this should never happen - requested memory from device index that cannot exist.
segment.SetMemoryReference(null);
segment.Reference = MemoryReferenceInfo.None;
AddSegmentToReferences(segment);
}
else {
// request memory from device in slot index.
if (m_Devices[deviceIndex - 1] == null) {
segment.SetMemoryReference(null);
segment.Reference = MemoryReferenceInfo.None;
}
else {
segment.SetMemoryReference(m_Devices[deviceIndex - 1].GetMemoryInterface());
segment.Reference = MemoryReferenceInfo.Device | (MemoryReferenceInfo)deviceIndex;
}
AddSegmentToReferences(segment);
}
}
internal void GetROMReference(Segment segment)
{
segment.SetMemoryReference(m_ROM);
segment.Reference = MemoryReferenceInfo.ROM;
AddSegmentToReferences(segment);
}
internal void AddSegmentToReferences(Segment segment)
{
int index = m_References.IndexOf(segment);
if (index == -1) {
m_References.Add(segment);
}
}