NvramPei

Index: 0407 | Size: 16,704 bytes | Phase: PEI | Format: PE32 (Ia32)

Overview

NVRAM variable services PEIM that manages UEFI variable storage during the PEI phase. Provides NVRAM initialization (hardware bring-up, GPIO configuration), variable read services via both legacy (ReadOnlyVariable) and modern (ReadOnlyVariable2) PPIs, and internal variable store traversal (checksum verification, variable search by name/GUID, payload access).

Key Functions

• ModuleEntryPoint -- EFI entry: calls PeiGetVariableAddressPpi to register variable access PPIs
• NvramInitHardware -- Hardware NVRAM initialization: GPIO configuration, LPC bridge setup
• NvramPollGppD1 -- Polls GPP_D1 hardware, reports progress status
• PeiGetVariableCompat -- Legacy ReadOnlyVariable PPI getter (deprecated path)
• PeiGetVariableCompat2 -- ReadOnlyVariable2 PPI getter (modern path)
• NvramFunctionDispatch -- NVRAM operation dispatcher
• NvramVariableServiceDispatch -- Variable service routing
• NvramGetBaseAddresses -- Retrieves NVRAM flash base addresses
• NvramFindDefaultsInFv -- Locates default variable store in firmware volume
• NvramInitDefaults -- Initializes default variable storage
• NvramFindVariable -- Searches variable store by name+GUID with checksum validation
• NvramGetVariable / NvramGetVariableName / NvramGetVariablePayload -- Variable data extraction
• NvramVerifyChecksum -- Store entry checksum verification
• NvramCompareVariableName / NvramMatchVariableName -- Variable name comparison utilities

Dependencies

• EFI_PEI_READ_ONLY_VARIABLE2_PPI -- Variable access PPI (installed)
• EFI_PEI_READ_ONLY_VARIABLE_PPI -- Legacy variable access PPI (installed)
• NVRAM flash hardware (GPIO, LPC/FWH)
• PEI Services (PPI registration, HOB access)

Platform

Lenovo HR650X (Purley)
Source: AmiModulePkg/NVRAM/NvramPei/