A List of PatchGuard v8.1 Related Functions on x64 and ARM

I was working on analyzing PatchGuard on Windows RT 8.1 (which runs on ARM) last two months and got that work done recently. Analysis tuned out to be a lot easier than I expected mostly because PatchGuard's code was written in C and had the almost same structure on both x64 which I had already analyzed and ARM.

In order to look at PatchGuard on Window RT 8.1, almost all I had to do was to identify PatchGuard related functions and map them with corresponding functions on x64.

Here is a table showing that mapping (ones have different names between platforms are highlighted).

x64	ARM
CcAdjustBcbDepth	CcUnmapBehindLazyReader
CcBcbProfiler	CcDelayedFlushTimer
CcInitializeBcbProfiler	CcPrepareDelayedFlushTimers
CmpAppendDllSection	ExpWnfAcquireNameInstanceShared
CmpEnableLazyFlushDpcRoutine	CmpEnableLazyFlushDpcRoutine
CmpLazyFlushDpcRoutine	CmpLazyFlushDpcRoutine
DeferredRoutine	<NoSymbol>
ExInitSystemPhase2	ExInitSystemPhase2
ExpCenturyDpcRoutine	ExpCenturyDpcRoutine
ExpTimerDpcRoutine	ExpTimerDpcRoutine
ExpTimeRefreshDpcRoutine	ExpTimeRefreshDpcRoutine
ExpTimeZoneDpcRoutine	ExpTimeZoneDpcRoutine
FsRtlMdlReadCompleteDevEx	RtlpExecuteHandlerForUnwind_xdata_compact
FsRtlUninitializeSmallMcb	ExpPrefetchPushLock
IopTimerDispatch	IopTimerDispatch
KeCompactServiceTable	KeCompactServiceTable
KeInitAmd64SpecificState	KeArmDiscoverCacheTopology
KiBalanceSetManagerDeferredRoutine	KiBalanceSetManagerDeferredRoutine
KiDispatchCallout	CcDelayedFlushTimer
KiDpcDispatch	<NoSymbol>
KiFastGetCallersAddress	KiFastGetCallersAddress
KiFatalExceptionFilter	KiFatalExceptionFilter
KiFilterFiberContext	KiArmDiscoverCacheTopology
KiGetGdtIdt	<NoSymbol>
KiLockExtendedServiceTable	KiLockExtendedServiceTable
KiLockServiceTable	KiLockServiceTable
KiMcaDeferredRecoveryService	KiInitializeExternalCacheController
KiScbQueueScanWorker	PopPdcSampleIdleTimeouts
KiServiceTablesLocked	KiServiceTablesLocked
KiTimerDispatch	<NoSymbol>
PopPoCoalescinCallback	PopPoCoalescinCallback
PopThermalZoneDpc	PopThermalZoneDpc
PsQueryThreadTerminationPort	PspGetReaperLink
RtlLookupFunctionEntryEx	CmpFlushLockedHives
SdbpCheckDll	PspInitDeferredResourceReservation
<NoSymbol>	CmpDelayFreeTMWorker
<NoSymbol>	FsRtlPrivateResetHighestLockOffset
<NoSymbol>	FsRtlReInitializeTunnelCache
<NoSymbol>	FsRtlRemovePerStreamContextEx
<NoSymbol>	KiCheckForDivideOverflow
<NoSymbol>	KiRundownScbQueue
<NoSymbol>	RtlInsertSmallIndex

These functions were taken from an ntoskrnl.exe version 6.3.9600.17476 and either only used by PatchGuard or have some importance from the point of view of analysis. For example, IopTimerDispatch() is not a PatchGuard dedicated function but can be used as one of its DPC routines, while KeInitAmd64SpecificState() and KeArmDiscoverCacheTopology() are dedicated and only used to initiate PatchGuard.

It seemed that some more functions were added for PatchGuard since Windows 10, but most, if not all, of these functions still remain the same name, so though this list is unlikely to be perfect, it would help you start your own analysis on both x64 and ARM.