private void KernelMain()
{
CompilerIntrinsics.Cli(); // TODO: superfluous
for (uint i = 0; i < 50 * 80; i++)
{
NucleusCalls.VgaTextWrite(i, 0);
}
Thread init = new Thread(new InitThread(), true);
_NewThread(init);
uint x = 0xe100;
uint y = 0;
while (true)
{
CompilerIntrinsics.Cli(); // TODO: superfluous
NucleusCalls.VgaTextWrite(79, x);
x++;
// Schedule thread, wait for exception or interrupt
ScheduleNextThread();
// CurrentThread received exception, interrupt, or exited voluntarily
uint cid = CurrentThread;
Thread t = threadTable[cid];
CompilerIntrinsics.Cli(); // TODO: superfluous
uint cState = NucleusCalls.GetStackState(cid);
if (cState == STACK_EMPTY)
{
// Thread received an exception. Kill it.
t.alive = false;
}
CompilerIntrinsics.Cli(); // TODO: superfluous
if (t.alive)
{
// Thread was interrupted. It's still ready to run.
NucleusCalls.SendEoi();
CheckWakeUp();
CompilerIntrinsics.Cli(); // TODO: superfluous
NucleusCalls.StartTimer(0);
readyQueue.Enqueue(t);
}
else
{
NucleusCalls.VgaTextWrite(78, (uint)(0x5b00 + 0x1100 * (y++) + 48 + cid));
// Thread is dead. Dead threads always jump back to stack 0.
threadTable[cid] = null;
NucleusCalls.ResetStack(cid);
}
}
}
internal static void Print(char c)
{
CompilerIntrinsics.Cli();
NucleusCalls.VgaTextWrite(offset, (uint)(0x1e00 | c));
offset++;
if (offset == 40 * 80)
{
offset = 80;
}
NucleusCalls.VgaTextWrite(offset, (uint)(0x3b00 | 33));
CompilerIntrinsics.Sti();
}
internal static void VgaTextWrite(uint position, uint data)
{
try
{
CompilerIntrinsics.Cli();
NucleusCalls.VgaTextWrite(position, data);
}
finally
{
CompilerIntrinsics.Sti();
}
}