public static void Initialize()
{
var context = new ProcessContext.Context();
context.type = ProcessContext.Context_Type.PROCESS;
context.tid = ProcessContext.m_NextCID++;
context.name = "Boot";
context.esp = 0;
context.stacktop = 0;
context.state = ProcessContext.Thread_State.ALIVE;
context.arg = 0;
context.priority = 0;
context.age = 0;
context.parent = 0;
ProcessContext.m_ContextList = context;
ProcessContext.m_CurrentContext = context;
IOPort counter0 = new IOPort(0x40);
IOPort cmd = new IOPort(0x43);
int divisor = 1193182 / 25;
cmd.Byte = (0x06 | 0x30);
counter0.Byte = (byte)divisor;
counter0.Byte = (byte)(divisor >> 8);
IOPort pA1 = new IOPort(0xA1);
IOPort p21 = new IOPort(0xA1);
pA1.Byte = 0x00;
p21.Byte = 0x00;
}
public static void SwitchTask()
{
interruptCount++;
if (ProcessContext.m_CurrentContext != null)
{
ProcessContext.Context ctx = ProcessContext.m_ContextList;
ProcessContext.Context last = ctx;
while (ctx != null)
{
if (ctx.state == ProcessContext.Thread_State.DEAD)
{
last.next = ctx.next;
break;
}
last = ctx;
ctx = ctx.next;
}
ctx = ProcessContext.m_ContextList;
while (ctx != null)
{
if (ctx.state == ProcessContext.Thread_State.WAITING_SLEEP)
{
ctx.arg -= 1000 / 25;
if (ctx.arg <= 0)
{
ctx.state = ProcessContext.Thread_State.ALIVE;
}
}
ctx.age++;
ctx = ctx.next;
}
ProcessContext.m_CurrentContext.esp = INTs.mStackContext;
tryagain :;
if (ProcessContext.m_CurrentContext.next != null)
{
ProcessContext.m_CurrentContext = ProcessContext.m_CurrentContext.next;
}
else
{
ProcessContext.m_CurrentContext = ProcessContext.m_ContextList;
}
if (ProcessContext.m_CurrentContext.state != ProcessContext.Thread_State.ALIVE)
{
goto tryagain;
}
ProcessContext.m_CurrentContext.age = ProcessContext.m_CurrentContext.priority;
INTs.mStackContext = ProcessContext.m_CurrentContext.esp;
}
Global.PIC.EoiMaster();
Global.PIC.EoiSlave();
}