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CmosDxe.c	Recovering names (cleanups)	2 days ago
CmosDxe.h	Recovering names (cleanups)	2 days ago
CmosDxe.md	Restructure the repo	2 days ago
README.md	Restructure the repo	2 days ago

CmosDxe

Field	Value
Index	263
Module	CmosDxe
File	CmosDxe.efi
PE format	PE32+
Size (hex)	45E4h
Size (bytes)	17,892
Subsystem	EFI Boot Service (000Bh)
Sections	6 (.text, .rdata, .data, section_3, .xdata, .reloc)
Phase	DXE
Source	AmiCompatibilityPkg/CmosManager
Build	HR6N0XMLK, DEBUG_VS2015, X64

Overview

This DXE driver provides a comprehensive CMOS/RTC NVRAM management protocol (AMI CmosManager). It supports standard CMOS NVRAM access via ports 0x70/0x71 (NMI-enabled), extended CMOS access via ports 0x72/0x73, and bank-switched CMOS register ranges. The driver implements CMOS shadow buffering with deferred write/flush, checksum calculation and verification, RTC time read/write, optimal defaults loading, HOB-based CMOS variable persistence, and a BIOS setup variable storage interface.

Key Functions

CmosManagerDriverEntry / CmosManagerInstallProtocol -- DXE entry and protocol installation
CmosReadRegister / CmosWriteRegister -- single register read/write by address
CmosReadVariable / CmosWriteVariable -- 32-bit extended CMOS bank read/write
CmosVerifyChecksum / CmosUpdateChecksumDelta -- checksum verification and update
CmosReadTime / CmosWriteTime -- RTC time read/write (BCD-encoded, century-aware)
CmosReadShadowBuffer / CmosFlushOrLoadDefaults -- shadow buffer management
CmosPortIoAccess / CmosBankPortIoAccess -- raw CMOS port I/O access
CmosGetDebugLevel / CmosDebugPrint -- debug output infrastructure

Dependencies

CMOS I/O ports 0x70/0x71 (standard) and 0x72/0x73 (extended)
UEFI Boot Services
UEFI Runtime Services
PCD Protocol
HOB List
DebugLib

Platform

Intel/AMD64 UEFI, Lenovo HR650X BIOS