NtConvertBetweenAuxiliaryCounterAndPerformanceCounter - NtDoc

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

// rev
/**
 * The NtConvertBetweenAuxiliaryCounterAndPerformanceCounter routine converts the specified performance counter value to the corresponding auxiliary counter value;
 * optionally provides the estimated conversion error in nanoseconds due to latencies and maximum possible drift.
 *
 * @param ConvertAuxiliaryToPerformanceCounter  If TRUE, the value will be converted from AUX to QPC. If FALSE, the value will be converted from QPC to AUX.
 * @param PerformanceOrAuxiliaryCounterValue The performance counter value to convert.
 * @param ConvertedValue On success, contains the converted auxiliary counter value. Will be undefined if the function fails.
 * @param ConversionError On success, contains the estimated conversion error, in nanoseconds. Will be undefined if the function fails.
 * @return NTSTATUS Successful or errant status.
 * @see https://learn.microsoft.com/en-us/windows/win32/api/realtimeapiset/nf-realtimeapiset-convertperformancecountertoauxiliarycounter
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtConvertBetweenAuxiliaryCounterAndPerformanceCounter(
    _In_ BOOLEAN ConvertAuxiliaryToPerformanceCounter,
    _In_ PULONG64 PerformanceOrAuxiliaryCounterValue,
    _Out_ PULONG64 ConvertedValue,
    _Out_opt_ PULONG64 ConversionError
    );

#endif
#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwConvertBetweenAuxiliaryCounterAndPerformanceCounter(
    _In_ BOOLEAN ConvertAuxiliaryToPerformanceCounter,
    _In_ PULONG64 PerformanceOrAuxiliaryCounterValue,
    _Out_ PULONG64 ConvertedValue,
    _Out_opt_ PULONG64 ConversionError
    );

#endif
View code on GitHub