HardwareSignatureEntry

Overview

This DXE driver implements the platform "Hardware Signature" feature from AmiModulePkg. The UEFI specification and Windows BitLocker/Secure Boot require the firmware to maintain a hardware signature -- a value that changes whenever the physical hardware configuration is altered. This driver connects to the HII hardware-configuration formset and installs a notification callback that reads the physical memory size, hardware status byte, hardware configuration DWORD, CMOS checksum, and firmware capability DWORD, then writes the updated hardware signature count into formset storage.

Key Functions

• HwSigEntryPoint -- Module entry point; initializes UEFI globals and HII formset callbacks
• HwSigFormCallback -- Monitors hardware configuration formset display/refresh events
• HwSigUpdateSignature -- Reads current platform state and updates the AmiHardwareSignatureSetupUpdateCountVar variable

Dependencies

• UEFI Boot/Runtime Services
• HII (Human Interface Infrastructure) Protocol
• CMOS access for battery-backed configuration status
• AmiModulePkg setup variable storage

Platform

X64 UEFI DXE driver, PE32+ format, 6 sections (.text, .rdata, .data, section_3, .xdata, .reloc). Part of AmiModulePkg.