#ifndef _NTMMAPI_H
//
// Enclave support
//
#if (PHNT_VERSION >= PHNT_WINDOWS_10)
#if (PHNT_MODE != PHNT_MODE_KERNEL)

// rev
/**
 * Calls a function within an enclave. NtCallEnclave can also be called within an enclave to call a function outside of the enclave.
 *
 * \param Routine The address of the function that you want to call.
 * \param Reserved Reserved for dispatch (RtlEnclaveCallDispatch)
 * \param Flags Additional flags for the call operation.
 * \param RoutineParamReturn The parameter than you want to pass to the function and return value of the function.
 * \return NTSTATUS Successful or errant status.
 * \see https://learn.microsoft.com/en-us/windows/win32/api/enclaveapi/nf-enclaveapi-callenclave
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtCallEnclave(
    _In_ PENCLAVE_ROUTINE Routine,
    _In_ PVOID Reserved,              // SelectVsmEnclaveByNumber > 0 // reserved for dispatch (RtlEnclaveCallDispatch)
    _In_ ULONG Flags,                 // ENCLAVE_CALL_FLAG_*
    _Inout_ PVOID* RoutineParamReturn // input routine parameter, output routine return value
    );

#endif
#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwCallEnclave(
    _In_ PENCLAVE_ROUTINE Routine,
    _In_ PVOID Reserved,              // SelectVsmEnclaveByNumber > 0 // reserved for dispatch (RtlEnclaveCallDispatch)
    _In_ ULONG Flags,                 // ENCLAVE_CALL_FLAG_*
    _Inout_ PVOID* RoutineParamReturn // input routine parameter, output routine return value
    );

#endif
View code on GitHub