RegAccessPeim

Overview

Register Access PEIM providing read/write/modify services for processor and uncore registers during the PEI phase. Handles address translation for IIO (Integrated IO), CHA, PCU, Ubox, and other CPU/internal bus registers across multiple sockets. Uses dispatch tables keyed by access width and register box type.

Key Functions

• RegAccessReadRegister: Register read via width-based dispatch table
• RegAccessWriteRegister: Register write dispatch
• RegAccessReadModify: Atomic read-modify-write (AND/OR mask)
• RegAccessGetConfigSpace: Configuration space descriptor retrieval
• Hardware topology tables (access width per box type)

Dependencies

• CpRcPkg/Universal/RegAccess framework
• IIO, CHA, PCU, Ubox register definitions
• PEI Register Access PPI GUID (gRegAccessPpiGuid)

Platform

• Arch: IA32 (PE32)
• Image Base: 0xFFDAE9EC
• Source: CpRcPkg/Universal/RegAccess/Pei/RegAccess.c
• SHA256: 06a6b9c070f5f34999d24c8c98445461cbdd1808d17715adaf3d12fd99313e47
• Toolchain: VS2015 DEBUG IA32