TCMDXE

Index: 0076 | Size: 7168 bytes | Arch: x64 | Phase: DXE

Overview

This DXE driver implements a Trusted Computing Module (TCM) driver for UEFI DXE phase. It communicates with TCM hardware via memory-mapped FIFO registers at 0xFED40000 (locality 0). The driver detects TCM hardware presence (vendor ID check, signature 0x1B4D), and if a TCM is found and ready, registers a callback via the TCG physical presence protocol (gTcpaCallbackGuid) to invoke TCM operations including Startup, SelfTest, PhysicalEnable, PhysicalSetDeactivated, and ForceClear.

Key Functions

• ModuleEntryPoint -- Initializes UEFI library globals and HOB list, then detects TCM hardware
• TcmDetectHardware -- Checks TCM vendor/device ID at FIFO register offset 0xF00 for signature 0x1B4D
• TcmRegisterCallback -- Registers a callback via the TCPA callback protocol (gTcpaCallbackGuid)
• TcmStartup -- Sends TPM2_Startup command to the TCM hardware
• TcmSelfTest -- Initiates TCM self-test operation
• TcmPhysicalEnable -- Sends PhysicalEnable command to the TCM
• TcmPhysicalSetDeactivated -- Sends PhysicalSetDeactivated command
• TcmForceClear -- Sends ForceClear command to reset TCM state

Protocols / Dependencies

• TCPA Callback Protocol (gTcpaCallbackGuid: {6B221186-7E6F-4A71-...})
• PCD Protocol
• HOB List (for system configuration table)

Platform

HR650X (AMI BIOS, Intel)