LegacySredir

Function Table

Address	Name
	ReadUnaligned64
	DebugClearMemory
	DebugPrint
	DebugAssert
	HobGuidMatch
	IoOrMemWrite
	UartInitConfigRegisters
	SioUartRegisterSetup
	InitPchRcConfiguration
	SioSetupRegisterDevice
	SmmRuntimeServicesNotify
	LegacySerialRedirectionRegister
	LegacySerialRedirectionUnregister
	SmmReadyToBootCallbackRegister
	SmmSwDispatch2Callback
	SmmBase2Communicate
	LegacySredirDriverEntryPoint
Global	Variables
UEFI	Boot/Runtime Services Table pointers
EFI_BOOT_SERVICES	*gBS; // 0x2400
0x2408	*EFI_SYSTEM_TABLE gST; // 0x2410**
SIO	Protocol interface (resolved from protocol GUID at 0x2260)
Used	for Super I/O register access via PCI configuration space.
VOID	*gSioProtocol; // 0x2390
SMM	protocols
VOID	*gSmmSwDispatch2Protocol; // 0x2378 - GUID 0x2290
0x23C0	- GUID 0x22E0
0x23B0	- GUID 0x2280
Debug	Mask protocol (GUID at .rdata 0x2240)
VOID	*gDebugMaskProtocol; // 0x23F0
SIO	data pointer and size (returned from SIO protocol Open at 3:7:9)
VOID	*gSioDataPtr; // 0x2380
0x2368	//
HOB	list pointer (from DXE HOB Library)
VOID	*gHobList; // 0x23F8
SMM	communication buffer (32 bytes, allocated at entry)
VOID	*gCommunicationBuffer; // 0x2388
SIO	PCI MMIO base address (calculated from PCI BAR)
UINT64	gSioPciMmioBase; // 0x2438
SIO	MMIO address and limit (from InitPchRcConfiguration)
UINT64	gSioMmioAddress; // 0x23B8
UART	Configuration structure (44 bytes at 0x2440)
SIO_UART_CONFIG	gUartConfig;
Default	*baud rate reference (1843200 = 115200 16)**
UINTN	gDefaultBaudRate; // 0x23A0
State	flags
BOOLEAN	gSioSetupDone; // 0x2398
0x2399	BOOLEAN gPchRcConfigured; // 0x2371
0x2370	BOOLEAN gInitDone; // 0x2360
UART	configuration flags (bitfield)
UINT32	gUartConfigFlags; // 0x239C
Extra	UART config fields
UINT16	gWord2444; // 0x2444
GUID	structures for HOB matching
EFI_GUID	gHobGuid1; // 0x22F0
0x22F8	//=============================================================================
Utility	Functions
Forward	to DebugMaskProtocol DebugPrint handler
Call	DebugMaskProtocol.AssertCallback (at offset 8)
Hardware	I/O Helpers
Parses	serial config from variable data (baud, data bits, stop
Sets	gUartConfigFlags, gUartConfig, gXmmword2450, gQword2460
gDword2468	register width field.
return	EFI_SUCCESS;
Set	Divisor Latch Access Bit (DLAB = 0x80)
Write	divisor low/high, then clear DLAB
if	(Config->DataBuffer != NULL) {
if	(Config->RegisterWidth == 4) {
Direct	I/O port write
IoWrite8	((UINT16)Config->IoPort + 3, 0x80);
If	loc_40E is 0, return EFI_NOT_STARTED.
Attempt	to read the "PchRcConfiguration" variable (size 1495).
If	variable has config bytes 83 and 197 set to 1:
Calculate	*gSioPciMmioBase = gSioMmioAddress + (UINT16)(gSioMmioAddress + 11)*
Copy	UART config from MMIO to gUartConfig
Open	PCI config space at offset 8
Status	= gSioProtocol->OpenPciConfig (8, &Offset);
Search	for $SBC signature, write config
for	(SearchPtr = Offset; SearchPtr < 0xF0000; SearchPtr++) {
Write	back the offset
Status	= gSioProtocol->WritePciConfig (8, &Offset);
Search	for $SBF signature, write same config
Close	PCI config space
Build	notification GUID
Main	Driver Functions
Locate	SMM SW Dispatch 2 Protocol
if	(gSmmSwDispatch2Protocol == NULL) {
if	(!gInitDone) {
Setup	SIO UART registers and register with SMM SW Dispatch 2
if	**(!gSmmReadyToBootRegistered	**
Register	first SMI handler
Register	second SMI handler (different SwSmiInputValue)
Use	unregister action (SwSmiConfig[0] = 2)
ZeroMem	(SwSmiConfig, sizeof (SwSmiConfig));
Invoke	the ReadyToBoot callback immediately
return	*((EFI_STATUS ()(VOID* ))gSmmReadyToBootProtocol)(gSmmReadyToBootProtocol);**
Check	if in SMM and SMM state != 3
Status	= gSmmBase2Protocol->InSmm (&InSmm);
Register	ReadyToBoot callback
return	SmmReadyToBootCallbackRegister ();
Entry	Point
Save	protocol pointers
gST	= SystemTable;
Allocate	SMM communication buffer (32 bytes, EfiReservedMemoryType)
Status	= gBS->AllocatePool (
Locate	SIO Protocol (open with params 3, 7, 9)
Status	= gBS->LocateProtocol (&gSioProtocolGuid, NULL, &gSioProtocol);
Register	protocol notification for SMM Ready To Boot
Registration	= NULL;
Register	SMM Base 2 periodic callback via SetTimer (period = 8)
Status	= gBS->SetTimer (
Register	protocol notification for SMM SW Dispatch 2
Status	= gBS->RegisterProtocolNotify (
Register	protocol notification for SMM Dispatch 2 data
_ModuleEntryPoint	(DXE standard entry, supplied by lib)
Provided	by UefiBootServicesTableLib + UefiRuntimeServicesTableLib.
Initializes	ImageHandle, gST, gBS, gRT globals, calls GetSystemHobList
then	invokes LegacySredirDriverEntryPoint.

Generated by HR650X BIOS Decompilation Project