SioDxeInit

Function Table

Address	Name	Description
	SioDeviceInit
	PchPcrWriteReg
	PchDetectSku
	IsInterruptsEnabled
	GetConfigTable
	SioMmioBase
	EnableInterrupts
	DisableInterrupts
	ReadEflags
	IoRead16
	IoWrite16
	IoRead16Alt
	IoWrite16Alt
	IoRead32
	IoWrite32
	PciRead32
	PciWrite32
	PciRead16
	PciWrite16
	DebugPrint
	DebugAssert
	ReadUnaligned64
	CompareGuid
	DebugGetLevel
	ConfigureLpcIoRange
	SetLpcRegisterRaw
	ConfigureLpcDecode
	SioDxeInitPre
	ModuleEntryPoint
	SioDeviceRead
	SioDeviceWrite
	SioDeviceRegister
	SioDriverBindingStart
Global	variable declarations
UEFI	service table pointers (cached at driver startup)
EFI_SYSTEM_TABLE	*gST; ///< offset 0x2658
Driver	instance handle installed protocols on
EFI_HANDLE	mDriverHandle = NULL; ///< offset 0x2650
SIO	DXE Init protocol structure (installed as protocol interface)
SIO_DXE_INIT_PROTOCOL	mSioDxeInitProtocol; ///< offset 0x2600
Cached	PCH SKU type (detected at runtime)
0	= Unknown, 1 = LbgPch, 2 = LbgPchH, 3 = Unsupported
UINT32	mPchSkuType = 3; ///< offset 0x2644
Debug	library state (report status code protocol)
VOID	*mDebugLib = NULL; ///< offset 0x2678
Forward	declarations of local helper functions
Interrupt	control helpers
sub_390	-- Enable interrupts (STI)
STATIC	VOID
sub_3A0	-- Disable interrupts (CLI)
sub_3B0	-- Read EFLAGS
STATIC	UINTN
sub_1AAC	-- Check if interrupts are enabled (EFLAGS.IF bit 9)
STATIC	BOOLEAN
sub_B9C	-- Read UINT16 from I/O port (word-aligned check)
STATIC	UINT16
sub_BCC	-- Write UINT16 to I/O port (word-aligned check)
sub_C0C	-- Read UINT16 from I/O port
sub_C40	-- Write UINT16 to I/O port
sub_C80	-- Read UINT32 from I/O port (dword-aligned check)
STATIC	UINT32
sub_CB0	-- Write UINT32 to I/O port (dword-aligned check)
PCI	Configuration via CF8/CFC (legacy I/O method)
sub_17F0	-- Read DWORD from PCI config space via CF8/CFC
sub_189C	-- Write DWORD to PCI config space via CF8/CFC
sub_1668	-- Read WORD from PCI config space via CF8/CFC
sub_1724	-- Write WORD to PCI config space via CF8/CFC
sub_2E0	-- Internal memory copy with overlap support
STATIC	VOID *
Overlapping	from above: copy backwards
UINT8	DstEnd = (UINT8 )Destination + Length - 1;
UINTN	Count8 = Length >> 3;
PCH	PCR (Private Config Register) Write
sub_195C	-- Write to PCH PCR register (base 0xFDEF0000)
Handles	byte, word, and dword accesses.
sub_1A14	-- Detect PCH SKU type from LPC device ID (PCR register)
LbgPch	} else if ((LpcDevId + 0x5E40) >= 0x100 &&
LbgPchH	} else {
Debug	Library
sub_6C8	-- Get the debug library instance (report status code protocol)
sub_748	-- Debug print with severity mask check
sub_790	-- ASSERT check with debug print
DXE	Services Table Retrieval
sub_7D0	-- Locate a configuration table by GUID from the system table
STATIC	EFI_STATUS
sub_D40	-- Read 8 bytes unaligned
STATIC	UINT64
sub_E18	-- Compare two GUIDs (two 64-bit compare)
DXE	Services / HOB / Protocol retrieval helpers
sub_8C4	-- Get the HOB list pointer from the configuration table
sub_E80	-- Locate PCD protocol (lazy init)
STATIC	PCD_PROTOCOL *
sub_894	-- Get SIO MMIO base via MM PCI USRA protocol
Accesses	the LPC bridge (B0 D31 F0) to get the
B0	D31 F0
MMIO	PciAddress.RegisterOffset = 0;
Debug	Level Filter (sub_CF0)
sub_CF0	-- Read the current debug level from CMOS (RTC register 0x4B)
Returns	EFI_D_INFO, EFI_D_WARN, or 0.
Read	CMOS index, set to debug register 0x4B
CmosIndex	= __inbyte (0x70);
Check	platform debug enable (0xFDAF0490 register bit 1)
ExtendedDebugLevel	= ((volatile UINT8 )0xFDAF0490 & 2)	1;**
Map	debug level to EFID mask values
if	(DebugLevel == 1) {
0x00000004	}
LPC	I/O Cycle Decode Configuration (sub_1450 / sub_1038 / sub_F0C)
sub_1450	-- Configure a new LPC I/O range decode entry.
Manages	the 4-entry I/O range decode table in SIO MMIO.
Finds	an available slot or resizes an existing overlapping range.
Check	existing ranges for overlap or empty slot
for	(EntryIndex = 0; EntryIndex < 4; EntryIndex++) {
Empty	slot found	create entry
IoRangeEntry	**= (IoBase & LPC_IO_PORT_ENTRY_BASE_MASK)	**
Check	IoBase within range
Overlap	detected	update existing range
sub_F0C	-- Set up a custom IO range entry when DeviceType == 0xFF.
Handles	LPC IO decode for a specific I/O address.
Called	by sub_1038 for raw register access configurations.
Scan	LPC IO decode registers at the given Cf8 address
to	find which slot matches the requested register.
SlotBase	= Register;
sub_1038	-- Core LPC IO cycle decode configuration.
Routes	legacy device I/O ranges through the PCH LPC bridge.
UART	if (IoConfig != 0) {
LPT	case 3: // GPIO
KBC	IoWrite16 (SIO_CONFIG_PORT, SIO_UNLOCK_KEY);
PMC	IoWrite16 (SIO_CONFIG_PORT, SIO_GLOBAL_LOCK);
PME	break;
Raw	register access
SIO	Protocol Implementation (sub_948)
sub_948	-- Initialize a specific SIO device (AST2500 DxeInit path)
Handles	device configuration based on type.
Module	Entry Point (sub_45C + _ModuleEntryPoint)
sub_45C	-- Driver entry-point initialization.
Sets	up service table pointers, locates protocols
configures	PCH LPC I/O decode range, and installs
the	SIO protocol interface.
Initialize	UEFI service table pointers
gImageHandle	= ImageHandle;
Locate	DXE Services Table
Status	= GetConfigTable (&gEfiDxeServicesTableGuid, (VOID )&gDS);**
Locate	MM PCI USRA protocol
if	(mPciUsra == NULL) {
Initialize	HOB list
GetHobList	();
Get	PCD protocol and configure PCIe segment bus
Install	SIO protocol interface
Status	= gBS->InstallMultipleProtocolInterfaces (
UEFI	Module Entry Point (sub_3C0 -> _ModuleEntryPoint)
_ModuleEntryPoint	(at 0x3C0)
The	UEFI DXE driver entry point.
Calls	SioDxeInitPre to initialize, then installs the SIO protocol.
EFI_STATUS	EFIAPI
Initialize	driver
Status	= SioDxeInitPre (ImageHandle, SystemTable);
Install	protocol interface
BootServices	= gBS;
SIO	Protocol: SIO Device Read (SioDeviceRead stub)
SIO	Protocol: SIO Device Write (SioDeviceWrite stub)
SIO	Protocol: SIO Device Register (SioDeviceRegister stub)
Protocol	structure initialization
GUID	definitions and protocol references
SIO	Protocol GUID: {9D36F7EF-6078-4419-8C46-2BBDB0E0C7B3}
EFI_GUID	gEfiGenericSioProtocolGuid = SIO_PROTOCOL_GUID;
sub_680	-- SIO Driver Binding protocol "Start" stub
sub_680	-- Driver binding Start() function.
Verifies	controller handle and initializes SIO.
Initialize	SIO protocol instance

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