IsSecRecoveryPEI

Overview

IsSecRecoveryPEI is a minimal PEIM that determines whether the system is booting in recovery mode during the pre-memory PEI phase. It provides helper memory routines (memset, memmove, memset32) for use before main memory is available and checks the boot mode by locating PPIs to confirm a secure recovery condition.

This module is among the earliest PEIMs executed, running directly from cache-as-RAM (CAR) before DRAM initialization, and plays a role in the secure boot path decision for the firmware recovery process.

Key Functions

• ModuleEntryPoint -- Entry point; locates the recovery PPI and asserts if not found at the expected revision.
• SecRecoveryMemset -- Byte-level memory fill for pre-memory operation.
• SecRecoveryMemmove -- Overlap-safe memory copy for pre-memory use.
• SecRecoveryMemset32Pairs -- 32-bit pair memory fill in counted loops.
• SecRecoveryMemset32 -- 32-bit value memory fill wrapper.

Dependencies

• SEC/PEI recovery PPI
• PeiServices (revision check)
• Pre-memory execution environment (CAR)

Platform

Intel Purley platform, pre-memory SEC/PEI phase, 32-bit X64 dump.