NvramSmm

Function Table

Address	Name	Description
	ModuleEntryPoint
	NvramCoreInit
	SmiNvramCommHandler
	SmiNvramUpdateHandler
	RuntimeGetVariable
	RuntimeSetVariable
	RuntimeGetNextVariableName
	RuntimeQueryVariableInfo
	SecureBootSetVariable
	SecureBootGetVariable
	NvramSyncCallbackSetup
	GetFvHeaderSize
	VarStoreInit
	NvramHobRetrieve
Build	path: e:\hs\Build\HR6N0XMLK\DEBUG_VS2015\X64\AmiModulePkg\NVRAM\NvramSmm\DEBUG
Source	files: NvramSmm.c, NvramDxeCommon.c, NvramSmi.c, AuthService.c
Global	State (from .data section)
0x11670	*EFI_SYSTEM_TABLE gST = NULL; // 0x11660**
0x11668	*EFI_RUNTIME_SERVICES gRT = NULL; // 0x11678**
0x11680	*VOID gDS = NULL; // 0x11758**
0x116F8	*VOID gMmst; // 0x116F0**
0x11690	*VOID gSmmBufferValidation = NULL; // 0x11750**
0x115D0	UINT64 gNvramStoreSize = 0; // 0x115D8
0x11C24	UINT8 gVarStoreInitFlags = 0; // 0x11C20
0x11C28	*EFI_RUNTIME_SERVICES gRuntimeServicesOverride = NULL; // 0x116E8**
0x11F10	UINTN gDriverNvramBufferSize = 0; // 0x11F18
0x11648	UINT64 gMailboxNvramBase = 0; // 0x11F28
0x11F30	UINT32 gMailboxNvramFlags = 0; // 0x11F38
0x11F40	UINT64 gMailboxVarStoreSize = 0; // 0x11F48
0x11609	BOOLEAN gSmiProcessing = FALSE; // 0x11768
0x11894	VAR_STORE_INFO gVarStoreArray[?]; // 0x11C38
Module	Entry Point
Initialize	all UEFI/SMM plumbing
Global	status variable
Locate	SmmBase2 protocol
Get	SMM System Table
Locate	SMM memory allocation protocol
Get	SMRAM ranges
Initialize	PCIE segment bus table
Initialize	AmiCryptoLib
Initialize	heap memory manager
Locate	SMM buffer validation protocol
Locate	DxeServicesTable
Fall	through to SMM protocol install / notification init (returned from Init)
NVRAM	Initialization (sub_10F8)
Signal	that NVRAM store size at least matches HOB pattern
Get	NVRAM HOB from HOB list
Read	NvramMailBox variable to get mailbox memory region info
Extract	mailbox NVRAM base/size details from the variable
offset	0
offset	8
offset	60
offset	736
offset	744
Close	the variable
Validate	that VarStoreInfo NVRAM sizes match mailbox
Copy	VarStoreInfo NVRAM data from mailbox into working buffer
If	simulation mode, also copy NvInfo data from mailbox
Allocate	DMA buffer for SMI communication (0x40000 bytes)
Initialize	buffer header
data	starts at +24
usable	size
Register	SMI handler for NVRAM variable access
Register	notification callback on SMM ReadyToLock
Override	runtime variable services
Register	variable change callbacks for variable sync
Register	additional callbacks for DmiArray variable change
Register	SMM communication protocol for variable sync
SMI	NVRAM Communication Handler (sub_6AE4)
Validate	buffer address with SMM buffer validation protocol
Align	the buffer pointer to 8-byte boundary
Set	SMI processing flag
Read	command code at offset 0
Type	0: GetVariable operation
Buffer	layout: +0x00: cmd, +0x08: NameSize, +0x10: DataSize
Nested	variable read with sub_5580
Type	1: SetVariable operation
Buffer	layout: +0x00: cmd, +0x08: NameLength, +0x10: DataSize
sub_5654	handles the actual set
Type	2: GetNextVariableName
Type	3: QueryVariableInfo
Type	4: Variable write with auth
Migration	complete notification
Write	status back to command code location
SMI	NVRAM Update Handler (sub_5FAC and sub_5E44)
qword_11F00	// Validate comm buffer
Check	size match
Check	that source buffer has a valid FV header
Check	if FV header size is consistent
Validate	the data aligns with store parameters
Need	to allocate bigger temp buffer (3x)
Copy	source NVRAM data
Check	that data is not all 0xFF (empty erased)
Check	for active NVRAM (FV header + GUID match)
Check	size matches the data in the FV
Copy	from temp to working store
Set	up store pointers for the migration
source	address
Validate	store parameters
F	Fill header calculation
Set	up the variable enumeration
Try	to find space and move
Garbage	collection / flush path
Mark	old store entries
mark	deleted
Full	GC path
At	this point the GC reclaimed space
Runtime	Variable Service Overrides
Dispatches	to SMI via SMI_NVRAM_CMD_GET_VARIABLE command
For	non-SMM context, sends SMI to enter SMM first.
Forward	declaration: actual implementation at sub_5580.
Dispatches	to SMI via SMI_NVRAM_CMD_SET_VARIABLE command
Forward	declaration: actual implementation at sub_5654.
Dispatches	via SMI_NVRAM_CMD_GET_NEXT_VARIABLE
Forward	declaration: actual implementation at sub_F54.
Dispatches	via SMI_NVRAM_CMD_QUERY_VARIABLE_INFO
Forward	declaration: actual implementation at sub_5D34.
SecureBoot	Aware Variable Services
Determine	variable type from vendor GUID
Log	DEBUG((
Write	the variable to the actual NVRAM store
Handle	SecureBootMode transitions
First	type: handle PK/KEK changes
Setup	mode -> set to secure boot mode 0
Deployed	mode -> set to 3
Not	physically present
user	mode
For	DeploymentModeNv and VendorKeysNv, reject access
Variable	Synchronization Callbacks
Check	disable flag variable
Read	disable flag
Variable	sync from Setup to other config variables
Sync	fields from Setup to variables
Sync	SocketIioConfig
Sync	SRIOVEnable between IntelSetup and Setup
NVRAM	Storage Helper Functions
Check	for FV header signature at offset 40
FV	header length at offset 48
basic	FV header only
Extended	header present at ExtHeaderOffset
Return	aligned total size
start	from end, working backwards
aligned	from flags field
Attempt	to locate existing variable data
Check	for valid flash store
no	existing data
NVRAM	HOB Retrieval (sub_644C)
Search	for NVRAM HOB
No	HOB found, run in simulation mode
HOB	+48 = NVRAM size
HOB	+24 = store address
Validate	that store fits in the GCD descriptor
Allocate	working buffer for NVRAM image
If	no real store, fill with 0xFF (simulation)
Read	store from actual flash
First	initialization: discover GCD descriptor
Validate	boundaries
Setup	variable store info from working buffer
Store	info pointer to the variable store array entry
Set	up callback table for for for for for for...
Mark	as initialized
Allocate	the driver's NVRAM working buffer (3x store size for GC)
Process	"StdDefaults" if present for first-boot defaults
Load	default variable values from HOB or FV
clear	defaults flag
Apply	defaults
Determine	actual maximum NVRAM size across all stores
Re	allocate driver buffer with larger size
NVRAMAM	Init (sub_68384)
Find	the NVRAM HOB from HOB list
Walk	HOB list looking for NVRAM HOB data structure
Initialize	driver's NVRAM working buffer
Initialize	the store from from HOB
Set	up VarStore array entry
Allocate	working comparison buffer
Ensure	all stores fit in the working buffer

Generated by HR650X BIOS Decompilation Project