#ifndef _NTPSAPI_H
//
// Threads
//
#if (PHNT_MODE != PHNT_MODE_KERNEL)

/**
 * Sets LDT (Local Descriptor Table) entries.
 *
 * \param Selector0 The first selector.
 * \param Entry0Low The low part of the first entry.
 * \param Entry0Hi The high part of the first entry.
 * \param Selector1 The second selector.
 * \param Entry1Low The low part of the second entry.
 * \param Entry1Hi The high part of the second entry.
 * \return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtSetLdtEntries(
    _In_ ULONG Selector0,
    _In_ ULONG Entry0Low,
    _In_ ULONG Entry0Hi,
    _In_ ULONG Selector1,
    _In_ ULONG Entry1Low,
    _In_ ULONG Entry1Hi
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwSetLdtEntries(
    _In_ ULONG Selector0,
    _In_ ULONG Entry0Low,
    _In_ ULONG Entry0Hi,
    _In_ ULONG Selector1,
    _In_ ULONG Entry1Low,
    _In_ ULONG Entry1Hi
    );

#endif
View code on GitHub