NtAllocateReserveObject - NtDoc

#ifndef _NTPSAPI_H
// Reserve objects
#if (PHNT_MODE != PHNT_MODE_KERNEL)
#if (PHNT_VERSION >= PHNT_WIN7)

/**
 * Allocates a memory reserve object.
 *
 * @param MemoryReserveHandle Pointer to a variable that receives the memory reserve object handle.
 * @param ObjectAttributes Pointer to an object attributes structure.
 * @param Type The type of memory reserve.
 * @return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtAllocateReserveObject(
    _Out_ PHANDLE MemoryReserveHandle,
    _In_ PCOBJECT_ATTRIBUTES ObjectAttributes,
    _In_ MEMORY_RESERVE_TYPE Type
    );

#endif
#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwAllocateReserveObject(
    _Out_ PHANDLE MemoryReserveHandle,
    _In_ PCOBJECT_ATTRIBUTES ObjectAttributes,
    _In_ MEMORY_RESERVE_TYPE Type
    );

#endif
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