OpromUpdateDxeLightningRidgeEXECB4

Function Table

Address	Name	Description
	__inbyte
	__outbyte
	OpromOperationUnsupported
	DebugPrint
	DebugAssert
	IsHobListGuid
	ReadUnaligned64
	_ModuleEntryPoint
NULL	// ============================================================================
Platform	I/O Intrinsics (MSVC inbyte / outbyte replacements)
Embedded	Binary Data (GUIDs and Protocol Interface)
GUID	storage block at 0xB40 in .data.
Contains	GUIDs used by the driver.
static	CONST UINT8 GuidBlock[0x40] = {
OpROM	update stub protocol interface data block (at 0xB80 in .data).
This	structure serves as the registered protocol interface.
It	starts with a signature/header ("PSET") followed by a callback pointer.
Layout	(24 bytes):
static	CONST UINT8 OpromUpdateProtocolData[OPROM_UPDATE_PROTOCOL_DATA_SIZE] = {
Version	= 1
Callback	-> sub_48C (0x48C)
Reserved	/ second copy -> sub_48C
Global	Variables (.data segment)
Cached	pointer to the OpROM update protocol interface.
Resolved	once by GetDebugLibProtocol() and reused thereafter.
static	*VOID gOpromUpdateProtocol = NULL;**
Cached	pointer to the HOB (Hand-Off Block) list.
Resolved	once by GetHobList() and reused thereafter.
VOID	*gHobList = NULL;
Stub	Callback Implementation
Protocol	Resolution
Check	if protocol was already resolved.
if	(gOpromUpdateProtocol != NULL) {
Allocate	pool for the protocol interface.
The	pool type used corresponds to memory type 31 (implementation-specific
allocation	type for UBA protocol interfaces).
AllocatePool	signature: (PoolType, Size, Buffer).
Initialize	the protocol interface with the single callback pointer.
Locate	the DebugLib protocol using gBS->LocateProtocol().
If	the protocol cannot be located (e.g., not yet installed), set the
cached	pointer to NULL so the caller can handle gracefully.
if	*(EFI_ERROR((gBS->LocateProtocol)((EFI_GUID* )&GuidBlock[0x00], NULL, &gOpromUpdateProtocol))) {**
Debug	Output
Resolve	the DebugLib/OpROM protocol interface.
Protocol	= GetDebugLibProtocol ();
Determine	platform type from CMOS register 0x4B.
Read	the CMOS register using port I/O instructions.
CmosValue	= __inbyte (RTC_INDEX_PORT);
Validate	platform type. If > 3, use as-is.
If	== 0, fall back to MMIO register at 0xFDAF0490.
if	(PlatformType > 3) {
PlatformType	is valid as-is
Platform	type 1..3 = valid
Check	if the platform type matches the Lightning Ridge EXEC B4 type.
if	((PlatformType - 1) <= 0xFD) {
Build	the error mask for this platform:
if	(PlatformType == OPROM_PLATFORM_TYPE_LIGHTNING_RIDGE) {
If	the requested ErrorLevel matches the platform's error mask
call	the DebugLib protocol's output function (at offset 0x00).
if	((ErrorMask & ErrorLevel) != 0) {
Invoke	the debug output function.
directly	pointing to the stack location after Format. In the actual
UEFI	DebugLib implementation, this is the DebugVPrint function.
Assertion	Handler
Resolve	the DebugLib protocol interface.
Call	the assertion handler function at offset 0x08 in the
protocol	interface. The assertion handler is accessed via pointer
arithmetic	on the raw protocol interface.
HOB	List Management
Return	cached value if already resolved.
if	(gHobList != NULL) {
Initialize	and iterate through configuration tables.
gHobList	= NULL;
Walk	the configuration table array.
Each	entry is 24 bytes (sizeof(EFI_CONFIGURATION_TABLE)).
for	(Index = 0; Index < TableCount; Index++) {
Check	if this table's VendorGuid matches EFI_HOB_LIST_GUID.
if	(IsHobListGuid (NULL, &ConfigTable[Index].VendorGuid)) {
If	no HOB list was found, trigger assertion failure.
if	(gHobList == NULL) {
Read	the expected GUID halves from the GUID storage block.
The	EFI_HOB_LIST_GUID is stored at GuidBlock + 0x20.
ExpectedFirstHalf	= ReadUnaligned64 (&GuidBlock[0x20]);
Read	the target GUID as two 64-bit halves.
GuidFirstHalf	= ReadUnaligned64 (GuidPtr);
Both	halves must match.
return	(GuidFirstHalf == ExpectedFirstHalf) && (GuidSecondHalf == ExpectedSecondHalf);
Utility	Functions
Validate	Buffer is not NULL.
if	(Buffer == NULL) {
Read	8 bytes from the buffer as a 64-bit value.
Cast	to volatile to prevent compiler optimizations from re-ordering
or	combining the access.
return	(CONST UINT64 )Buffer;
Module	Entry Point
Cache	global pointers.
gImageHandle	= ImageHandle;
Validate	input parameters.
if	(ImageHandle == NULL) {
Locate	HOB list (ensures PCI enumeration data is available).
Initializes	gHobList for use by the UBA framework.
GetHobList	(ImageHandle);
Log	debug banner indicating this is the OpROM Update driver for
the	Lightning Ridge EXEC B4 platform.
DebugPrint	(DEBUG_INFO, "UBA:SETUPConfigUpdate-TypeLightningRidgeEXECB4\n");
Locate	the UBA Lightning Ridge EXEC B4 board-type protocol.
The	protocol GUID is stored at GuidBlock + 0x10.
If	the UBA protocol was found, register the OpROM update configuration.
The	registration function is at offset 0x10 in the protocol interface.
if	(!EFI_ERROR (Status)) {
OPROM_UPDATE_PROTOCOL_REGISTRATION_GUID	*(VOID )OpromUpdateProtocolData**
24	bytes

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