RtlAddAccessAllowedAceEx

NTSTATUS __stdcall RtlAddAccessAllowedAceEx(
        PACL Acl,
        UINT64 AceRevision,
        UINT64 AceFlags,
        _ACCESS_MASK AccessMask,
        VOID *Sid){
  return RtlpAddKnownAce(Acl, AceRevision, AceFlags, *(UINT64 *)&AccessMask, Sid, 0);
}

Referenced by:

PiAuCreateLocalSystemSecurityObject
PiAuCreateStandardSecurityObject
PiAuGetDriverDataDirectorySecurityObject