CmosPei

Overview

This PEIM provides CMOS (Real-Time Clock/NVRAM) access services during the PEI phase. It implements read/write operations to CMOS I/O ports (0x70/0x71) for accessing RTC registers and CMOS NVRAM storage. The module likely installs a CMOS access PPI for other PEI modules to consume, enabling early platform configuration reads before DXE.

Key Functions

• CMOS read/write via standard RTC I/O ports (0x70/0x71, 0x72/0x73)
• CMOS NVRAM offset access for platform configuration
• SetMem / CopyMem / SetMem32 / SetMemN / SetMem16 -- Memory utility functions

Dependencies

• CmosPei.h (module header)
• PEI Services
• CMOS/RTC I/O port interface

Platform

• Architecture: IA32 (32-bit)
• Machine type: x86 (0x014C)
• Subsystem: EFI Boot Service Driver (0x000B)
• Format: PE32
• Image base: 0xFFE63F9C
• Sections: .text (9KB), .rdata, .data, .reloc