NtSetBootOptions - NtDoc

#ifndef _NTEXAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)
#if (PHNT_VERSION >= PHNT_WINXP)

/**
 * The NtSetBootOptions routine sets the boot options.
 *
 * @param BootOptions A pointer to a BOOT_OPTIONS structure that specifies the new boot options.
 * @param FieldsToChange A bitmask that specifies which fields in the BOOT_OPTIONS structure are to be changed.
 * @return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtSetBootOptions(
    _In_ PBOOT_OPTIONS BootOptions,
    _In_ ULONG FieldsToChange
    );

#endif
#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwSetBootOptions(
    _In_ PBOOT_OPTIONS BootOptions,
    _In_ ULONG FieldsToChange
    );

#endif
View code on GitHub