private void AddStream(MemorySection stream)
{
Int64 byteCount = stream.Length;
Int32 startKey = (Int32)stream.BasePosition >> 16;
Int32 endKey = startKey + ((Int32)(stream.Length - 1) >> 16);
Int32 sliceCount = (endKey - startKey);
logger.Debug($"Mapping {sliceCount + 1} slices of {stream} to physical N64 memory -> {stream.BasePosition:X8}");
for (Int32 i = startKey; i <= endKey; i++)
{
if (m_SectionMap[i] != null)
{
throw new InvalidOperationException("Overlay error has occurred!");
}
m_SectionMap[i] = stream;
}
}
private void Access(Action <Stream, byte[], int, int> op,
byte[] buffer, int offset, int count,
Int32 key)
{
if (count <= 0)
{
return;
}
/* Pull out the memory section */
MemorySection section = m_SectionMap[key];
/* If the section exists, read from its data */
if (section != null)
{
/* Set the position on the stream */
section.Position = Position - section.BasePosition;
/* Compute the number of bytes to access */
Int32 length = (Int32)(Math.Min(section.BasePosition + section.Length, section.Position + count) - section.Position);
/* Call the access op */
op(section, buffer, offset, length);
/* Increment buffer offset, decrement count, and increment position */
offset += length;
count -= length;
Position += length;
/* Access possible section */
Access(op, buffer, offset, count, (Int32)Position >> 16);
}
else
{
/* Skip non-existing section */
Position += 0x10000;
Access(op, buffer, offset + 0x10000, count -= 0x10000, key + 1);
}
}
public void Initialize()
{
CheckDispose();
m_SectionMap = new MemorySection[0x10000];
m_RDRam = new MemorySection(0x100000, 0x00000000);
m_PifMemory = new MemorySection(0x800, 0x1FC00000);
m_PIMem = new ParallelInterfaceMemory();
m_RspMemory = new MemorySection(0x2000, 0x04000000);
m_RspRegisterMemory = new RspRegisterMemory();
m_MiIntefaceMemory = new MipsInterfaceMemory();
if (m_CartMemory != null)
{
AddStream(m_CartMemory);
}
/* Setup the region hashtable */
AddStream(m_RDRam);
AddStream(m_PIMem);
AddStream(m_RspMemory);
AddStream(m_RspRegisterMemory);
AddStream(m_PifMemory);
}