OpromUpdateDxeNeonCityEPECB

Function Table

Address	Name	Description
	ReadUnaligned64
	CompareGuidQword
	UbaDebugPrint
	UbaAssert
	IsPcieSlotNumberValid
	GetDefaultSlotConfig
	GetNeonCitySlotConfig
	GetPcieSlotNumberTable
	SetPcieSlotNumber
	OpromUpdateEntryPoint
Global	UEFI table pointers (initialized at entry point)
EFI_HANDLE	gImageHandle = NULL;
Cached	UBA protocol interface pointer (for debug print and assert)
STATIC	*VOID mUbaProtocol = NULL;**
Cached	HOB list pointer
STATIC	*VOID mHobList = NULL;**
GUID	definitions (located in .data section at runtime)
STATIC	CONST EFI_GUID mDxeServicesProtocolGuid =
OPRM	(Option ROM Policy) Table
8	entries, each spanning 3 bytes across a 4-byte stride.
The	table encodes the PCI bus:device:function range for each of the 8 slots.
Entries	are at offsets 0xEF1, 0xEF5, 0xEF9, 0xEFD, 0xF01, 0xF05, 0xF09, 0xF0D.
At	runtime the data is populated by the platform initialization code.
Byte	layout per entry (bytes v4-1, v4, v4+1):
Combined	**key: ((Bus << 8)	(Device << 16)	(Function << 24)) & 0xFFFFFF00**
STATIC	*UINT8 mOprmTable[OPRM_TABLE_ENTRY_COUNT OPRM_TABLE_STRIDE];**
Default	slot configuration table (all 0xFFFF = empty)
STATIC	UINT8 mDefaultSlotConfig[64] = { 0 };
NeonCity	EP EC B slot configuration table
Placeholder	entries matching the .rdata structure at 0xD40
PciBdfSlot	number table (10 entries for NeonCity EP EC B)
PCI	Device ID
PCI	Vendor ID
PCIe	Slot Capabilities register value
Data	at 0xE40 - platform-specific PCIe BDF slot mappings
These	entries define the PCIe slot numbering for the platform
Scan	system configuration table for EFI_HOB_LIST_GUID entry
if	(gSystemTable->NumberOfTableEntries > 0) {
HOB	list not found - trigger assertion (matching original behavior)
UbaDebugPrint	(
Get	HOB size via DXE Services GetBootMode (function at vtable+24 = index 3)
HobSize	= gBootServices->CalculateE820CompatibleSize (31);
Locate	UBA protocol via DXE Services Table
Status	= gBootServices->LocateProtocol (
Detect	platform type from CMOS/RTC register
RtcReg	= IoRead8 (RTC_ADDRESS_PORT);
Validate	platform type
if	(PlatformType > PLATFORM_TYPE_MAX) {
PlatformType	**= (MmioRead32 (PLATFORM_TYPE_MMIO_REG) & 0x2)	0x1;**
Set	filter level based on platform type
FilterLevel	= UBA_DEBUG_ERROR;
Call	UBA debug print function if severity matches filter
Debug	print function is at vtable offset 1 (index 1, offset 8)
if	((FilterLevel & ErrorLevel) != 0) {
Assert	function is at vtable offset 2 (index 2, offset 16)
AssertFunc	*= (EFI_STATUS (EFIAPI )(CONST CHAR8* , UINTN, CONST CHAR8 ))*
Adjust	for v4-1 offset
Each	OPRM entry is 3 bytes at 4-byte stride
OprmEntry	*points to entry base = mOprmTable + (PortIndex 4)**
OprmEntry	*= (UINT8 )(UINTN)mOprmTable + (PortIndex* 4);**
Decode	BDF from 3 bytes at offset v4-1, v4, v4+1
Combined	**into a slot key: ((byte[-1] << 8)	(byte[0] << 16)	(byte[1] << 24)) & 0xFFFFFF00**
Bus	= OprmEntry[-1];
Build	**the BDF slot key: ((Bus)	(Device << 8)	(Function << 16)) << 8**
Then	OR with 0x19 (Slot Capabilities Register low byte offset) and 0x1A (high byte)
BdfSlotKey	**= (Bus	(Device << 8)	(Function << 16)) << 8;**
Locate	DXE Services Protocol
Read	slot range low byte via DXE Services function at vtable+56 (index 7)
BdfSlotKey	**	0x19 = PCIe Slot Capabilities register low byte**
Status	*= ((EFI_DXE_SERVICES )DxeServices)->GetFunctionTableEntry (**
Read	slot range high byte via DXE Services function at vtable+56 (index 7)
BdfSlotKey	**	0x1A = PCIe Slot Capabilities register high byte**
Check	if PciAddress falls within this slot's valid range
if	(PciAddress >= SlotRangeLow && PciAddress <= SlotRangeHigh) {
UBA	configuration data structure (48 bytes total)
Contains	GUID + version + callback function pointers
typedef	struct {
Platform	config GUID (16 bytes)
Configuration	data version
Alignment	padding
Callback	function pointers (the "PSET" table at 0xEC0 in .data)
Index	0: GetDefaultSlotConfig
Index	1: GetNeonCitySlotConfig
Index	2: GetPcieSlotNumberTable
Index	3: SetPcieSlotNumber
Index	4,5: Reserved (set to 0)
UINT64	*Callbacks[6]; // 6 8 = 48 bytes**
Initialize	global UEFI table pointers to match UEFI standard library behavior
gImageHandle	= ImageHandle;
Initialize	HOB list (cached for later use)
GetHobList	(ImageHandle);
Log	driver entry
Locate	the UBA OpromUpdate config protocol
Build	configuration data structure
CopyMem	(&ConfigData.ConfigGuid, &mUbaProtocolGuid, sizeof (EFI_GUID));
Register	configuration with UBA framework
Call	function at vtable index 2 (offset 16) in UbaConfigProtocol
return	*((EFI_STATUS (EFIAPI )(VOID* , VOID , VOID , UINTN))UbaConfigProtocol)(**

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