SmmPciRbIo

• Index: 0199
• Size: 13,188 bytes (12.9 KB)
• Phase: SMM (System Management Mode)
• PE Format: PE32+ x86-64, 5 sections (.text, .rdata, .data, section_3, .xdata)

Overview

SMM driver for PCI Root Bridge I/O access. Part of the AmiModulePkg/PCI/SmmPciRbIo package. This driver provides a root bridge I/O abstraction that operates from SMM context, allowing SMM code to perform PCI configuration cycles (both legacy CF8/CFC and PCIe enhanced configuration) independent of the DXE PCI infrastructure. It handles bus number translation, device enumeration, and memory-mapped PCIe configuration space access. This is essential for SMM drivers that need to query or configure PCI devices during runtime or S3 resume.

Key Functions

• ModuleEntryPoint -- Standard SMM entry; library init and PCI RbIo setup
• sub_544 -- AutoGen library constructor
• sub_1148 -- Core PCI Root Bridge I/O initialization (segment groups, bus range detection)
• sub_1530 -- Library destructor
• sub_340 -- Manual unload handler
• sub_1664 -- Error handler for PCI RbIo failures
• sub_2A0 -- Early PCI configuration space enumeration

Protocols

• SmmBase2 Protocol -- SMM entry point
• SmmPciRbIo Protocol -- Root bridge PCI I/O abstraction (PciRead/PciWrite via SMM)
• SmmCpuIo2 Protocol -- CPU I/O access in SMM

Platform

• Build: HR6N0XMLK DEBUG_VS2015 X64
• Source: AmiModulePkg/PCI/SmmPciRbIo
• Part of: HR650X BIOS SMM infrastructure (indices 0195-0199, 0201-0203)