#ifndef _NTEXAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)

/**
 * The NtSetBootEntryOrder routine sets the boot entry order.
 *
 * \param Ids A pointer to a buffer that specifies the identifiers of the boot entries in the desired boot order.
 * \param Count The number of entries in the buffer.
 * \return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtSetBootEntryOrder(
    _In_reads_(Count) PULONG Ids,
    _In_ ULONG Count
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwSetBootEntryOrder(
    _In_reads_(Count) PULONG Ids,
    _In_ ULONG Count
    );

#endif
View code on GitHub