NtPowerInformation - NtDoc

#ifndef _NTPOAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)

NTSYSCALLAPI
NTSTATUS
NTAPI
NtPowerInformation(
    _In_ POWER_INFORMATION_LEVEL InformationLevel,
    _In_reads_bytes_opt_(InputBufferLength) PVOID InputBuffer,
    _In_ ULONG InputBufferLength,
    _Out_writes_bytes_opt_(OutputBufferLength) PVOID OutputBuffer,
    _In_ ULONG OutputBufferLength
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwPowerInformation(
    _In_ POWER_INFORMATION_LEVEL InformationLevel,
    _In_reads_bytes_opt_(InputBufferLength) PVOID InputBuffer,
    _In_ ULONG InputBufferLength,
    _Out_writes_bytes_opt_(OutputBufferLength) PVOID OutputBuffer,
    _In_ ULONG OutputBufferLength
    );

#endif
View code on GitHub