Volume_Top_File

Field	Value
Index	425
Module	Volume_Top_File
Size	24,772 bytes (PE32 .text: 12,416 / _TEXT_RE: 88 / _TEXTPR: 224 / STARTUP: 5,415 / .rodata: 6 / .rdata: 5,364 / .data: 385 / .reloc: 0)
Phase	SEC
Functions	~147

Overview

Volume_Top_File implements the SEC (Security) phase and early PEI initialization for the Intel Purley platform. As the earliest executable code in the BIOS, it sets up cache-as-RAM (temporary RAM), configures CPU MTRRs, establishes protected-mode GDT and IDT with exception handlers, processes BIST results, locates and decompresses the PEI Core in the firmware volume, and transfers control to the PEI dispatcher. It is the most platform-architecture-sensitive module with 8 PE sections.

Key Functions

SecStartup / SecCoreEntryPoint -- SEC phase entry point chain
SecTemporaryRamStackInit -- Cache-as-RAM (Car) initialization
FindPeiCore -- Locates the PEI Core image in the firmware volume
PeiCoreEntryPoint -- Extracts and transfers control to the PEI Core
PeCoffImageRelocate -- Relocates the PE/COFF PEI Core image
SecBist -- Processes Built-In Self Test results for all CPU threads
InstallSecPpi -- Installs SEC-specific PPIs for the PEI phase

Dependencies

CPU MTRR/MSR registers
Firmware Volume (FV) HOB interface
PE/COFF image relocation library
Memory-mapped firmware flash
UEFI PI Specification (SEC-to-PEI handoff)

Platform

Architecture: IA32 (x86, PE32)
Subsystem: EFI Boot Service Driver (0x000B)
Machine: 0x014C (i386)
Build: DEBUG_VS2015 IA32
Characteristics: 0x2103 (relocatable stripped)