LegacySmmSredir

• Index: 0197
• Size: 7,428 bytes (7.3 KB)
• Phase: SMM (System Management Mode)
• PE Format: PE32+ x86-64, 5 sections (.text, .rdata, .data, section_3, .xdata)

Overview

SMM driver for legacy serial redirection, sourced from AmiModulePkg/LegacySerialRedirection. This driver provides SMM-based I/O access to serial ports for legacy serial console redirection during boot. It installs an SMM communicate handler that services read/write/block-fill commands targeting an I/O base address (serial port registers). The driver includes a CMOS-based platform detection mechanism (CMOS offset 0x4C) to determine whether legacy serial redirect is supported on the board. 20 functions across 0x1080 bytes of .text.

Key Functions

• _ModuleEntryPoint / ModuleEntryPoint (0x420) -- Standard SMM entry; calls init then dispatch
• LegacySmmSredirAutoGenInit (sub_44C) (0x44C) -- AutoGen library init; locates SmmBase2 and AmiBufferValidationLib
• LegacySmmSredirDriverEntry (sub_618) (0x618) -- Main entry; checks board support via CMOS, dispatches to main logic
• LegacySmmSredirMainDispatch (sub_C58) (0xC58) -- Primary dispatch; opens SMM subsystem, initializes globals
• LegacySmmSredirRegisterCommunicationServices (sub_9E8) (0x9E8) -- Registers communicate handler, SW dispatch, and notification callbacks
• LegacySmmSredirHandleCommunicate (sub_6CC) (0x6CC) -- Core handler: decodes read(1)/write(2)/fill(3) commands with width support
• LegacySmmSredirDetectPlatform (sub_115C) (0x115C) -- CMOS 0x4C platform detection

Recovered Name Mapping (current)

• ModuleEntryPoint is kept as a compatibility alias to _ModuleEntryPoint.
• qword_* and byte_* symbols in the decomp notes are now mapped to recovered names in LegacySmmSredir.c/h (gST, gBS, gSmst, gSmmMode, ...).

Module/file split notes

• LegacySmmSredir.md carries the detailed behavior and control-flow reconstruction.
• LegacySmmSredir.c/.h carry the normalized naming surface used for subsequent recovery.

Protocols

• SmmBase2 -- SMM entry; AmiBufferValidationLib -- buffer security check
• SmmCommunicate -- handler registration; SmmIo -- I/O space access
• DebugLib -- DEBUG/ASSERT support; SmmSwDispatch -- software SMI registration

Platform

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