TcgSmm

Overview

TcgSmm is the SMM (System Management Mode) component of the TCG (Trusted Computing Group) subsystem. It provides SMM-based trusted computing services, including TPM command processing from within SMM and SMI-triggered TCG event log management. This module runs in the SMM phase and handles TPM interactions that require system-management privilege.

Key Functions

• ModuleEntryPoint: Entry point that initializes the module and dispatches TCG SMM services.
• sub_4CC: SMI handler registration and TCG protocol installation.
• sub_778: Core TPM command processing and TCG event management.
• sub_1988: Error handling and cleanup for failed TCG operations.

Dependencies

• UEFI system table and boot services
• SMM base protocol and SMI dispatch
• TPM hardware interface (LPC/SPI TPM)
• SMM communication protocol for DXE-to-SMM TCG commands
• TCG/TPM EFI protocols and PPIs

Platform

HR650X server platform, x64 architecture. Runs in SMM context with system-management privilege for trusted computing operations.