#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_WINDOWS_10)
// rev
/**
 * The RtlInitializeBitMapEx routine initializes a 64-bit-capable extended bitmap header over a caller-supplied buffer.
 *
 * \param BitMapHeader A pointer to the RTL_BITMAP_EX to initialize.
 * \param BitMapBuffer A pointer to the caller-allocated buffer that stores the bitmap bits.
 * \param SizeOfBitMap The size of the bitmap, in bits.
 */
#ifndef PHNT_NO_INLINE_RTL_BITMAP

FORCEINLINE
VOID
NTAPI_INLINE
RtlInitializeBitMapEx(
    _Out_ PRTL_BITMAP_EX BitMapHeader,
    _In_ PULONG64 BitMapBuffer,
    _In_ ULONG64 SizeOfBitMap
    )
{
    BitMapHeader->SizeOfBitMap = SizeOfBitMap;
    BitMapHeader->Buffer = BitMapBuffer;
}

#endif
#endif
#endif
View code on GitHub

#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_WINDOWS_10)
// rev
/**
 * The RtlInitializeBitMapEx routine initializes a 64-bit-capable extended bitmap header over a caller-supplied buffer.
 *
 * \param BitMapHeader A pointer to the RTL_BITMAP_EX to initialize.
 * \param BitMapBuffer A pointer to the caller-allocated buffer that stores the bitmap bits.
 * \param SizeOfBitMap The size of the bitmap, in bits.
 */
#ifndef PHNT_NO_INLINE_RTL_BITMAP
// ...
#else

NTSYSAPI
VOID
NTAPI
RtlInitializeBitMapEx(
    _Out_ PRTL_BITMAP_EX BitMapHeader,
    _In_ PULONG64 BitMapBuffer,
    _In_ ULONG64 SizeOfBitMap
    );

#endif
#endif
#endif
View code on GitHub