NvramSmm

Overview

SMM NVRAM variable services driver. It handles variable access through SMI
communication, SecureBoot-aware policy checks, variable migration, and the
mailbox-backed NVRAM store state used by runtime overrides.

Key Functions

• SmiNvramCommHandler - SMI dispatch for variable operations
• NvramCoreInit - store initialization from HOB/mailbox state
• RuntimeGetVariable / RuntimeSetVariable - runtime service overrides
• SecureBootSetVariable - PK/KEK-aware variable writes
• NvramHobRetrieve - NVRAM HOB discovery and store setup

Protocols / Dependencies

• EFI_SMM_BASE2_PROTOCOL
• EFI_SMM_ACCESS2_PROTOCOL
• SMM Buffer Validation Protocol
• AmiCryptoLib
• SMM Communication Buffer

Platform

Intel Purley (Skylake-SP) / HR650X server, AmiModulePkg/NVRAM/NvramSmm