#ifndef _NTEXAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)

/**
 * The NtEnumerateBootEntries routine retrieves information about all boot entries in the system boot configuration.
 *
 * \param Buffer A pointer to a buffer that receives the boot entries information.
 * \param BufferLength A pointer to a variable that specifies the size of the buffer. On return, it contains the size of the data returned.
 * \return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtEnumerateBootEntries(
    _Out_writes_bytes_opt_(*BufferLength) PVOID Buffer,
    _Inout_ PULONG BufferLength
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwEnumerateBootEntries(
    _Out_writes_bytes_opt_(*BufferLength) PVOID Buffer,
    _Inout_ PULONG BufferLength
    );

#endif
View code on GitHub