MI_LOCK_RELOCATIONS_EXCLUSIVE

void __fastcall MI_LOCK_RELOCATIONS_EXCLUSIVE(__int64 a1, __int64 a2){
  --*(_WORD *)(a1 + 486);
  ExAcquirePushLockExclusiveEx(a2 + 24, 0i64);
  *(_QWORD *)(a2 + 8) = a1;
}

Referenced by:

MiCaptureSecureImageBaseAddress
MiRelocateImage
MiRelocateImageAgain