RtlInitializeGenericTableAvl - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTRTL_H

NTSYSAPI
VOID
NTAPI
RtlInitializeGenericTableAvl(
    _Out_ PRTL_AVL_TABLE Table,
    _In_ PRTL_AVL_COMPARE_ROUTINE CompareRoutine,
    _In_ PRTL_AVL_ALLOCATE_ROUTINE AllocateRoutine,
    _In_ PRTL_AVL_FREE_ROUTINE FreeRoutine,
    _In_opt_ PVOID TableContext
    );

#endif

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This function is documented in Windows Driver Kit.