ExportHiiDb

Function Table

Address	Name	Description
	ReadUnaligned64
	CompareGuid
	IsCpuInfoHob
	GetPlatformCmosType
	FormatUnsignedDecimal
	StringAppend
	FormatCpuInfoLine
	GetTotalCpuNumber
	ExportHiiDbNotify
	ExportHiiDbEntryPoint
Global	protocol pointer caches (used by standard UEFI library constructors)
EFI_HANDLE	gImageHandle = NULL;
Cached	copies for direct access within callbacks
STATIC	*EFI_SYSTEM_TABLE mSystemTable = NULL; // 0xe50 SystemTable_0**
0xe40	BootServices_0
0xe48	RuntimeServices_0
Vendor	GUID for the "HiiDB" UEFI variable
STATIC	CONST EFI_GUID mHiiDbVariableGuid =
GUID	for the HII database protocol that the notification event listens for
STATIC	CONST EFI_GUID mHiiDbProtocolGuid =
Cached	protocol interface pointer (lazy-init via GetHiiDbProtocol)
STATIC	*VOID mHiiDbProtocol = NULL; // 0xe30 qword_E30**
Cached	HOB list pointer (lazy-init via GetHobList)
STATIC	*VOID mHobList = NULL; // 0xe38 qword_E38**
Notification	event handle
STATIC	EFI_EVENT mNotificationEvent; // returned by CreateEventEx
Return	cached pointer if already resolved
if	(mHiiDbProtocol != NULL) {
OldTpl	= gBS->RaiseTPL (TPL_HIGH_LEVEL); // BS+24 (0x18): RaiseTPL
Only	proceed if we were at TPL_NOTIFY or below
if	(OldTpl <= TPL_NOTIFY) {
unaligned	load on x64
actually	mCpuInfoHobGuid	same bytes as mHiiDbProtocolGuid in this module
that	sub_824 compares against. In this driver both protocol and
HOB	use the same GUID value for match purposes.
Return	cached HOB list pointer
if	(mHobList != NULL) {
Check	if SystemTable has HOB list (set up by DXE core)
if	(mSystemTable->HobList != NULL) {
SystemTable	+ 0x68: number of entries or HOB end marker
Iterate	through HOB entries to find the CPU info GUID
for	( ; ; ) {
skip	to data portion
the	actual data pointer is at offset 16 from start
Advance	to next HOB
HobEntry	*= (EFI_HOB )((UINTN)HobEntry +* (UINT16 )((UINTN)HobEntry + 4));*
End	of HOB list
if	(mHobList == NULL) {
Dead	loop: mHobList should never be NULL if PEI published the CPU info
CpuDeadLoop	();
Read	CMOS status register (index 0x4B)
Preserve	NMI mask bit (bit 7)
__outbyte	**(0x70, (__inbyte (0x70) & 0x80)	0x4B);**
Determine	the NV storage type
if	(NvStorageType > 3) {
Map	type to platform type
if	(NvStorageType == 1) {
0x80000004	}
Seek	to end of Destination
while	*(Destination != L'\0') {**
Copy	Source characters including terminator
do	{
Implementation	reads from the CPU info HOB.
If	unpopulated, reads from chipset MSR range.
On	this platform, total CPU number is derived from
the	detected package count.
return	1;
Protocol	interface call at offset 0x20 (32):
EFI_STATUS	*(GetHiiDbPhysicalAddr)(**
IN	*VOID This**
IN	UINTN Flags
OUT	*EFI_PHYSICAL_ADDRESS PhysicalAddress**
IN	UINTN Reserved
Returns	EFI_NOT_FOUND (0x8000000000000005) if not yet populated
with	HiiDbPhysAddr containing the required buffer size from
On	EFI_NOT_FOUND:
UINTN	PagesNeeded = EFI_SIZE_TO_PAGES (HiiDbPhysAddr);
Status	= gBS->AllocatePages (
1	= AllocateAnyPages
6	= EfiRuntimeServicesData
Retry	the read with the allocated physical address
Then	publish the variable:
Status	= gRT->SetVariable (
EFI_VARIABLE_BOOTSERVICE_ACCESS	**	EFI_VARIABLE_RUNTIME_ACCESS**
Close	this event	one-shot notification
Set	up UEFI Library globals
gImageHandle	= ImageHandle;
Cache	local copies
mSystemTable	= SystemTable;
Initialize	HOB list
Create	a notification event that catches the HII DB protocol install.
Status	= gBS->CreateEventEx (
GUID	that triggers the event
ASSERT	if the event could not be created
if	(EFI_ERROR (Status)) {
Line	132 in ExportHiiDb.c: "!EFI_ERROR (Status)"
DEBUG	((EFI_D_ERROR

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