/// <summary>
/// Called as callback when a root device is found
/// </summary>
/// <param name="Object">The object</param>
/// <param name="NestingLevel">Nesting level</param>
/// <param name="Context">User context</param>
/// <param name="ReturnValue">Return value if early returned</param>
/// <returns>Status</returns>
private static int onRootDevice(void *Object, uint NestingLevel, void *Context, void **ReturnValue)
{
// Get routing table
AcpiObjects.Buffer buffer;
buffer.Length = Acpica.ACPI_ALLOCATE_BUFFER;
int status = Acpica.AcpiGetIrqRoutingTable(Object, &buffer);
if (status != Acpica.AE_OK)
{
Panic.DoPanic("[PCI] Couldn't get ACPI IRQ Routing Table");
}
// The last entry will have Length 0
Acpica.PCIRoutingTable *table = (Acpica.PCIRoutingTable *)buffer.Pointer;
while (table->Length > 0)
{
// No reference source
if (table->Source[0] == 0)
{
uint slot = (uint)(table->Address >> 16);
addIRQ(slot, table->Pin, table->SourceIndex, 0, 0);
}
// Source is not null, that means we need to lookup the reference resource
else
{
void *handle = null;
status = Acpica.AcpiGetHandle(Object, Util.CharPtrToString(table->Source), &handle);
if (status != Acpica.AE_OK)
{
Panic.DoPanic("[PCI] Couldn't load references handle");
}
status = Acpica.AcpiWalkResources(handle, Acpica.METHOD_NAME__CRS, onIRQResource, table);
if (status != Acpica.AE_OK)
{
Panic.DoPanic("[PCI] Couldn't process resources for IRQ");
}
}
// Next entry
table = (Acpica.PCIRoutingTable *)((byte *)table + table->Length);
}
// The object returned should be freed by us
Acpica.AcpiOsFree(buffer.Pointer);
return(Acpica.AE_OK);
}
/// <summary>
/// Handles IRQ resources
/// </summary>
/// <param name="Resource">The resource</param>
/// <param name="Context">User context</param>
/// <returns>Status</returns>
private static int onIRQResource(AcpiObjects.Resource *Resource, void *Context)
{
Acpica.PCIRoutingTable *table = (Acpica.PCIRoutingTable *)Context;
uint slot = (uint)(table->Address >> 16);
if (Resource->Type == AcpiObjects.ResourceType.IRQ)
{
AcpiObjects.ResourceIRQ *irq = (AcpiObjects.ResourceIRQ *)((byte *)Resource + sizeof(AcpiObjects.Resource));
byte *interrupts = (byte *)irq + sizeof(AcpiObjects.ResourceIRQ);
addIRQ(slot, table->Pin, interrupts[table->SourceIndex], irq->Polarity, irq->Trigger);
}
else if (Resource->Type == AcpiObjects.ResourceType.EXTENDED_IRQ)
{
AcpiObjects.ResourceExtendedIRQ *irq = (AcpiObjects.ResourceExtendedIRQ *)((byte *)Resource + sizeof(AcpiObjects.Resource));
uint *interrupts = (uint *)((byte *)irq + sizeof(AcpiObjects.ResourceExtendedIRQ));
addIRQ(slot, table->Pin, interrupts[table->SourceIndex], irq->Polarity, irq->Trigger);
}
return(Acpica.AE_OK);
}