LnvDriverDxe

Module: 0086
File: LnvDriverDxe.efi
Size: 16288 bytes (0x3FA0)
Phase: DXE (Driver Execution Environment)
MD5: 46b59da810d2a20676c5355f77381c78
SHA256: 67475b45ed48c5b3d20257696d55483b9b60727e15402b795dff2557483ff06d
Source package: LenovoServerPkg

Overview

Lenovo Server DXE driver implementing IPMI-based platform management. It provides boot-time initialization, ReadyToBoot and ExitBootServices event handling, periodic platform configuration via the LnvSetup UEFI variable, boot current tracking, and IPMI transport protocol management. The driver registers timer callbacks that read LnvSetup configuration bytes and send corresponding IPMI commands (netfn 0x80, cmd 0x8258) for fan control and other platform settings.

Key Functions

Function	Description
`_ModuleEntryPoint`	UEFI driver entry point; initializes globals then calls main init
`LnvDriverDxeInitGlobals`	Stores ImageHandle/SystemTable/BootServices/RuntimeServices; locates or registers for IPMI transport protocol
`LnvDriverDxeInit`	Creates ReadyToBoot and ExitBootServices notification events; creates two 1-second periodic timer events for LnvSetup config callbacks
`OnReadyToBoot`	ReadyToBoot callback; reads LnvSetup offset 5, sends IPMI command 0x8258 for fan control config
`OnExitBootServices`	ExitBootServices callback; applies final configuration via LnvSetupConfigCallback1 and closes the event
`LnvSetupConfigCallback0`	Periodic timer callback; reads LnvSetup offset 6, sends IPMI command
`LnvSetupConfigCallback1`	Periodic timer callback; reads LnvSetup offset 7, sends IPMI command
`IpmiSendCommand`	Sends IPMI command via the transport protocol
`GetProtocolInterface`	Locates and caches the debug protocol interface
`DebugPrint`	Debug print via protocol interface with level filtering
`DebugAssert`	Low-level assertion handler via debug protocol
`GetHobList`	Retrieves HOB list pointer from system table
`GetDebugLevel`	Reads current debug level from CMOS index 0x4B

Protocols/Dependencies

UefiBootServicesTableLib - Boot services table access
UefiRuntimeServicesTableLib - Runtime services table access
LnvIpmiLib - Lenovo IPMI command library
HobLib - HOB list retrieval
DebugLib - Debug output support
IPMI Transport Protocol (gLnvIpmiTransportProtocolGuid) - IPMI command transport
LnvDriverDxe Protocol (gLnvDriverDxeProtocolGuid) - Self-published protocol interface
LnvSetup UEFI variable (NV format) - Platform configuration storage

Platform

Lenovo ThinkSystem HR650X (Purley platform, Intel Xeon Scalable)