#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_WINDOWS_10_19H2)

NTSYSAPI
BOOLEAN
NTAPI
RtlIsZeroMemory(
    _In_ PVOID Buffer,
    _In_ SIZE_T Length
    );

#endif
#endif
View code on GitHub

// ntddk.h

NTSYSAPI BOOLEAN RtlIsZeroMemory(
  PVOID  Buffer,
  SIZE_T Length
);
View the official Windows Driver Kit DDI reference

NtDoc

This function is documented in Windows Driver Kit.

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Windows Driver Kit DDI reference (nf-ntddk-rtliszeromemory)

RtlIsZeroMemory function

Description

This routine checks if a block of unaligned memory is all zero.

Parameters

`Buffer`

Pointer to the memory buffer to check.

`Length`

Length, in bytes, of the memory buffer.

Return value

This function returns TRUE if the memory is all zero and FALSE otherwise.

RtlIsZeroMemory - NtDoc