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README.md	Restructure the repo	7 days ago
UsbPei.c	Restructure the repo	7 days ago
UsbPei.h	Restructure the repo	7 days ago
UsbPei.md	Restructure the repo	7 days ago

UsbPei

Field	Value
Index	418
Module	UsbPei
Size	36,068 bytes (PE32 .text: 31,803 / .rdata: 2,680 / .data: 427 / .reloc: 504)
Phase	PEI
Functions	119

Overview

UsbPei provides USB host controller initialization and basic I/O services during the PEI phase. It implements xHCI (eXtensible Host Controller Interface) memory management routines including page allocation, freeing, and PCI configuration space access. The module also supplies stall and status code reporting helpers used by the USB stack before the DXE phase begins.

Key Functions

XhciGetPciCfg -- Read PCI configuration space for the xHCI controller
XhciStall -- Microsecond delay for USB timing requirements
XhciAllocatePages / XhciFreePages -- Memory pool management for xHCI transfers
XhciReportStatusCode -- Report progress/error codes during USB initialization

Dependencies

PEI Services (PeiServices)
xHCI PCI configuration registers
System memory allocator

Platform

Architecture: IA32 (x86, PE32)
Subsystem: EFI Boot Service Driver (0x000B)
Machine: 0x014C (i386)
Entry Point: 0x31F