public ushort Read16(AcpiObject.RegionSpace regionSpace, ulong offset)
{
ushort result;
switch (regionSpace)
{
case AcpiObject.RegionSpace.SystemMemory:
// TODO: This is a first stab - ideally the AcpiObject.OperationRegion
// ought to be holding onto an IoMemoryRange and passing it in.
IoMemory region = IoMemory.MapPhysicalMemory(offset, 2, true /*readable*/, false /*writable*/);
result = region.Read16(0);
break;
case AcpiObject.RegionSpace.SystemIO:
IoPort port = new IoPort((ushort)offset, 2, Access.Read);
result = port.Read16();
break;
case AcpiObject.RegionSpace.PCI_Config:
pciConfigAddressPort.Write32(PciConfigEnableMask | (uint)offset);
result = pciConfigDataPort.Read16();
break;
default:
throw new Exception("Unimplemented operation region type" + regionSpace);
}
#if DUMP_RAW_READ_WRITES
DebugStub.WriteLine("ACPI read: space: " + regionSpace + ", offset: " + offset + ", bytes: " + 2 + ", result: " + result.ToString("X"));
#endif
return(result);
}