LegacyInterrupt

Function Table

Address	Name	Description
	LibConstructor
	LegacyInterruptInstall
	LegacyInterruptGetStatus
	LegacyInterruptGetVector
	LegacyInterruptReadVector
	LegacyInterruptWriteVector
	LpcWriteRegister
	DebugPrint
	DebugAssert
	IoRead16
	EfiGetSystemConfigurationTable
	MmPciReadConfig
	CompareGuid
	PchGetStepping
	ReadUnaligned64
	LegacyInterruptEntryPoint
GUID	definitions used by this module
0x12c0	- Unknown vendor GUID
0x12d0	- gMmPciUsraProtocolGuid (from CpRcPkg/DxeMmPciBaseLib)
0x12e0	- gEfiPcdProtocolGuid (11B34006-D85B-4D0A-A290-D5A571310EF7)
0x12f0	- gEfiLegacyInterruptProtocolGuid (31CE593D-108A-485D-ADB2-78F21F2966BE)
0x1300	- gEfiHobListGuid (7739F24C-93D7-11D4-9A3A-0090273FC14D)
0x1310	- gEfiDxeServicesTableGuid (05AD34BA-6F02-4214-952E-4DA0398E2BB9)
Function	pointer table for LegacyInterrupt protocol
STATIC	CONST LEGACY_INTERRUPT_PROTOCOL_INSTANCE mLegacyInterruptInterface = {
offset	0x1320 -> 0x638
offset	0x1328 -> 0x640
offset	0x1330 -> 0x650
offset	0x1338 -> 0x680
Global	state variables
0x1340	- mPchStepping (UINT8, initially 3 = PCH_STEPPING_UNKNOWN)
0x1348	- Protocol image handle (initially NULL)
STATIC	UINT8 mPchStepping = PCH_STEPPING_UNKNOWN;
Library	constructor - initializes UEFI boot/libraries
EFI_STATUS	EFIAPI
Save	globals
Get	DxeServicesTable from system configuration
Locate	MmPciUsra protocol (for PCI config access via MMIO)
Get	HOB list
Get	PCD protocol
Read	PCD: PcdLegacyInterruptPchStepping (token=5)
Install	the LegacyInterrupt protocol
EFI_STATUS	LegacyInterruptInstall (
Check	if protocol already installed
Install	protocol interface
PIC	mode, 8 IRQ lines active
Default	IRQ0
All	IRQs level-triggered (bitmask: IRQ0-IRQ4)
Active	high
Read	from LPC interrupt control register
Write	to LPC register via MMIO
VOID	LpcWriteRegister (
Call	PCH detection (lazy init)
Write	MMIO register in LPC bridge space
Get	the DebugOutput protocol instance (lazy init)
VOID	*
Debug	print function with board/platform detection
UINT8	DebugPrint (
Read	CMOS status for board detection
Debug	assert handler
VOID	DebugAssert (
Read	16-bit value from I/O port
Get	system configuration table by GUID
EFI_STATUS	EfiGetSystemConfigurationTable (
MMIO	PCI config read (via MmPciUsra protocol)
UINT32	MmPciReadConfig (
Base	address
Bus	0
Device	0x20, Func 0
Call	into MmPciUsra protocol
Get	HOB list pointer
Get	PCD protocol pointer
Compare	two GUIDs (via unaligned 64-bit read)
BOOLEAN	CompareGuid (
Read	as 64-bit values (handles unaligned)
Determine	PCH stepping based on LPC device ID
UINT8	PchGetStepping (
Read	LPC device ID via MMIO PCI config
Check	if LP-series
Bit	test: LPC device IDs matching LP
Read	unaligned 64-bit value
UINT64	ReadUnaligned64 (
Driver	entry point

Generated by HR650X BIOS Decompilation Project