SmmControl

Overview

SMM Control Runtime DXE driver for the PCH SMI management on Purley/LBG platforms. Provides EFI_SMM_CONTROL2_PROTOCOL and EFI_SMM_COMMUNICATION_PROTOCOL interfaces for SMI generation, status handling, and interprocessor communication. Manages SMI I/O port base configuration through PCH LPC decode registers and coordinates GPIO GPE/SMI events.

Key Functions

• SmmControlDriverEntryInit -- Driver initialization, saves globals, registers events
• SmiActivate -- Triggers SMI via control port writes
• SmmControl2Handler -- SMI generation handler
• SmmControl2Clear -- SMI status clear and GPE management
• SmmCommunicationCommunicate -- SMM communication buffer exchange
• PciExpressInit -- PCI Express MMIO base setup
• SmiClearGpeStatus -- GPIO GPE status register management
• OnVirtualAddressChange -- Converts pointers for runtime virtual addressing
• OnRestoreTpl / OnRuntimeReady -- Event notification callbacks

Dependencies

• EFI_SMM_CONTROL2_PROTOCOL
• EFI_SMM_COMMUNICATION_PROTOCOL
• PCH LPC I/O decode MMIO registers
• GPIO GPE/SMI configuration tables via HOB
• MM_PCI_USRA protocol

Platform

Intel Purley (Xeon Scalable), PCH LBG. x86-64 UEFI Runtime Driver.