OA3

OA3 (Microsoft OA 3.0) authentication driver for the Lenovo HR650X BIOS. This module implements Microsoft's OEM Activation 3.0 mechanism, which enables system-specific Windows product key injection and validation during manufacturing. It provides memory copy/compare utilities and CPU control primitives (pause, TSC read, interrupt enable/disable) as building blocks for the OA3 protocol flow.

Key Functions

• ModuleEntryPoint -- Standard UEFI entry point
• InternalMemCopyMem -- Overlap-safe memory copy (qmemcpy-based)
• InternalCompareMem -- Byte-by-byte memory comparison
• CpuPause -- Spin-wait halt via _mm_pause
• ReadTsc -- Read timestamp counter via __rdtsc
• CpuEnableInterrupts / CpuDisableInterrupts -- Interrupt flag manipulation

Dependencies

• Base libraries (implicit via Uefi.h)

Platform

x86-64 PE32+ (UEFI DXE driver), Lenovo HR650X (Purley/Intel grantley-EP), AMI ModulePkg