This is xnu-8019. See this file in:
Directory listing for xnu-8019//iokit/IOKit
AppleKeyStoreInterface.h
IOBSD.h
IOBufferMemoryDescriptor.h
IOCPU.h
IOCatalogue.h
IOCommand.h
IOCommandGate.h
IOCommandPool.h
IOCommandQueue.h
IOConditionLock.h
IODMACommand.h
IODMAController.h
IODMAEventSource.h
IODataQueue.h
IODataQueueShared.h
IODeviceMemory.h
IODeviceTreeSupport.h
IOEventSource.h
IOFilterInterruptEventSource.h
IOGuardPageMemoryDescriptor.h
IOHibernatePrivate.h
IOInterleavedMemoryDescriptor.h
IOInterruptAccounting.h
IOInterruptAccountingPrivate.h
IOInterruptController.h
IOInterruptEventSource.h
IOInterrupts.h
IOKernelReportStructs.h
IOKernelReporters.h
IOKitDebug.h
IOKitDiagnosticsUserClient.h
IOKitKeys.h
IOKitKeysPrivate.h
IOKitServer.h
IOLib.h
IOLocks.h
IOLocksPrivate.h
IOMapTypes.h
IOMapper.h
IOMemoryCursor.h
IOMemoryDescriptor.h
IOMessage.h
IOMultiMemoryDescriptor.h
IONVRAM.h
IONotifier.h
IOPMGR.h
IOPlatformActions.h
IOPlatformExpert.h
IOPolledInterface.h
IORPC.h
IORangeAllocator.h
IORegistryEntry.h
IOReportMacros.h
IOReportTypes.h
IOReturn.h
IOService.h
IOServicePM.h
IOServiceStateNotificationEventSource.h
IOSharedDataQueue.h
IOSharedLock.h
IOStatistics.h
IOStatisticsPrivate.h
IOSubMemoryDescriptor.h
IOSyncer.h
IOTimeStamp.h
IOTimerEventSource.h
IOTypes.h
IOUserClient.h
IOUserServer.h
IOWorkLoop.h
Makefile
OSMessageNotification.h
PassthruInterruptController.h
assert.h
machine/
nvram/
perfcontrol/
platform/
power/
pwr_mgt/
rtc/
skywalk/
system.h
system_management/