NtQueryAuxiliaryCounterFrequency - NtDoc

#ifndef _NTEXAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)
#if (PHNT_VERSION >= PHNT_WINDOWS_10_RS2)

// rev
/**
 * The NtQueryAuxiliaryCounterFrequency routine queries the auxiliary counter frequency. (The auxiliary counter is generally the HPET hardware timer).
 *
 * \param AuxiliaryCounterFrequency A pointer to an output buffer that contains the specified auxiliary counter frequency. If the auxiliary counter is not supported, the value in the output buffer will be undefined.
 * \return NTSTATUS Successful or errant status.
 * \see https://learn.microsoft.com/en-us/windows/win32/api/realtimeapiset/nf-realtimeapiset-queryauxiliarycounterfrequency
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtQueryAuxiliaryCounterFrequency(
    _Out_ PULONG64 AuxiliaryCounterFrequency
    );

#endif
#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwQueryAuxiliaryCounterFrequency(
    _Out_ PULONG64 AuxiliaryCounterFrequency
    );

#endif
View code on GitHub