/// <summary>
/// Adds an IRQ to the table
/// </summary>
/// <param name="slot">The slot</param>
/// <param name="pin">The pin</param>
/// <param name="irq">The IRQ</param>
private static void addIRQ(uint slot, uint pin, uint irq, uint polarity, uint trigger)
{
if (slot >= PCI_BUS_DEV_MAX || pin > PCI_PINS)
{
Panic.DoPanic("[PCI] Invalid IRQ added");
}
PciIRQEntry entry = new PciIRQEntry();
entry.Irq = irq;
entry.Flags = 0;
if (polarity == 0 || polarity == 3)
{
entry.Flags |= IOApic.IOAPIC_REDIR_POLARITY_LOW;
}
else
{
entry.Flags |= IOApic.IOAPIC_REDIR_POLARITY_HIGH;
}
if (trigger == 0 || trigger == 3)
{
entry.Flags |= IOApic.IOAPIC_REDIR_TRIGGER_LEVEL;
}
else
{
entry.Flags |= IOApic.IOAPIC_REDIR_TRIGGER_EDGE;
}
m_irqTable[(slot * PCI_PINS) + pin] = entry;
}
/// <summary>
/// Sets an interrupt handler for a PCI device
/// </summary>
/// <param name="dev">The device</param>
public static void SetInterruptHandler(PciDevice dev, IRQ.IRQHandler handler)
{
// Get IRQ routing data from table
PciIRQEntry irq = m_irqTable[(dev.Slot * PCI_PINS) + (dev.IRQPin - 1)];
uint irqNum = irq.Irq;
// If no routing exists, use the interrupt line
if (irqNum == 0)
{
irqNum = dev.IRQLine;
}
// First set the IRQ handler to avoid race conditions
IRQ.SetHandler(irqNum, handler);
IOApicManager.CreateEntry(irqNum, irqNum, irq.Flags);
// Info
Console.Write("[PCI] Set device to use IRQ ");
Console.WriteNum((int)irqNum);
Console.Write('\n');
}
