LnvDriverPei

Index: 0402 | Size: 10,176 bytes | Phase: PEI | Format: PE32 (Ia32)

Overview

Lenovo-specific PEI driver that initializes debug switch configuration and manages PPI notification callbacks. Reads the LnvSetup UEFI variable at boot, persists PEI/DXE/SMM debug switch values to CMOS, and builds a GUID HOB for consumption by later phases. Also provides IPMI command library constructor and debug service interfaces.

Key Functions

• ModuleEntryPoint -- Main entry: registers IPMI constructor PPI, calls LnvDebugSwitchInit
• LnvDebugSwitchInit -- Reads LnvSetup variable, writes PEI/DXE/SMM debug switches to CMOS offsets, builds gLnvDebugSwitchHobGuid HOB
• LnvDebugSwitchPpiCallback -- PPI notification callback with RTC timestamped debug output to serial
• MemoryDiscoveredPpiCallback -- Logs gEfiPeiMemoryDiscoveredPpiGuid signal
• BootInRecoveryModePpiCallback -- Logs recovery mode boot signal
• EndOfPeiSignalPpiCallback -- Logs end-of-PEI signal
• PeiLnvSendIpmiCmdConstructor -- IPMI command library PPI constructor with ASSERT on failure
• DebugPrint / DebugAssert -- Debug output wrappers via GET_DEBUG_SERVICE PPI
• CmosWriteByte / GetCmosService -- CMOS read/write via CMOS PPI
• ReadRtcDateTime / IsLeapYear / RtcCenturySet -- RTC date/time helpers
• PeiServicesGetPointer -- PEI services table pointer retrieval via IDT

Dependencies

• GET_DEBUG_SERVICE PPI -- Debug output interface
• CMOS PPI ({CCB296F6-...}) -- CMOS access
• LnvSetup UEFI Variable -- Debug configuration input
• PeiLnvSendIpmiCmdLib -- IPMI command library
• PeiServicesTablePointerLibIdt -- Services table pointer via IDT

Platform

Lenovo HR650X (Purley)
Source: LenovoServerPkg/Library/LnvIpmiLib/IpmiCmd/