#ifndef _NTRTL_H
typedef NTSTATUS ALLOCATE_VIRTUAL_MEMORY_EX_CALLBACK(
_Inout_ HANDLE CallbackContext,
_In_ HANDLE ProcessHandle,
_Inout_ _At_ (*BaseAddress, _Readable_bytes_ (*RegionSize) _Writable_bytes_ (*RegionSize) _Post_readable_byte_size_ (*RegionSize)) PVOID* BaseAddress,
_Inout_ PSIZE_T RegionSize,
_In_ ULONG AllocationType,
_In_ ULONG PageProtection,
_Inout_updates_opt_(ExtendedParameterCount) PMEM_EXTENDED_PARAMETER ExtendedParameters,
_In_ ULONG ExtendedParameterCount
);
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This callback function is documented in Windows Driver Kit.