CpuPei

Index: 0074 | Size: 61 KB (source) | Arch: x64 | Phase: PEI

Overview

CpuPei is a PEI driver responsible for early CPU initialization on Intel Purley platforms. It programs MTRRs (Memory Type Range Registers), processes BIST (Built-In Self Test) data for each CPU thread, publishes CPU-related HOBs, and handles cache control initialization before memory is fully available.

Key Functions

• MTRR programming for cache control (EarlyInitMtrr, ProgramMtrrs)
• BIST (Built-In Self Test) data collection and HOB publication
• CPU feature detection via CPUID
• Processor number and cache info HOB generation
• BIOS debug lock configuration
• Microcode patch level reporting
• CPU frequency ratio detection

Protocols / PPIs / Dependencies

• PEI CPU PPI
• PeiServicesTablePointer PPI
• EFI_PEI_PPI_DESCRIPTOR

Platform

HR650X (Purley platform, Skylake-SP / Xeon Scalable)