#ifndef _NTRTL_H
// Byte swap routines.
#ifndef PHNT_RTL_BYTESWAP
#define RtlUlongByteSwap(_x) _byteswap_ulong((_x))
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#ifndef _NTRTL_H
// Byte swap routines.
#ifndef PHNT_RTL_BYTESWAP
// ...
#else
NTSYSAPI
ULONG
FASTCALL
RtlUlongByteSwap(
_In_ ULONG Source
);
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This function is documented in Windows Driver Kit.