DevicePathDxe

Function Table

Address	Name	Description
	GetDevicePathType
	GetDevicePathSubType
	GetDevicePathNodeLength
	IsDevicePathEnd
	IsDevicePathEndInstance
	SetDevicePathNodeLength
	DevicePathValid
	DevicePathNodeLength
	DevicePathType
	DevicePathSubType
	DevicePathStrSize
	IsDevicePathMultiInstance
	DevicePathNodeInstanceContain
	CatDevicePathToTextStr
	DevicePathDxeEntryPoint
SECTION	1: Device Path Node Access (DevicePathUtilities)
GetDevicePathType	- Read Type byte from device path node
Equivalent	to EDK2: DevicePathType(Node)
UINT8	GetDevicePathType(
GetDevicePathSubType	- Read SubType byte from device path node
Equivalent	to EDK2: DevicePathSubType(Node)
UINT8	GetDevicePathSubType(
GetDevicePathNodeLength	- Read Length field from device path node
Equivalent	to EDK2: DevicePathNodeLength(Node)
UINTN	GetDevicePathNodeLength(
NextDevicePathNode	- Advance to next device path node
EFI_DEVICE_PATH_PROTOCOL	*
IsDevicePathEnd	- Check if node type is END (0x7F)
BOOLEAN	IsDevicePathEnd(
IsDevicePathEndInstance	- Check for END + END_ENTIRE (0xFF)
BOOLEAN	IsDevicePathEndInstance(
SetDevicePathNodeLength	- Write Length field
UINT16	SetDevicePathNodeLength(
SetDevicePathEndInstance	- Mark node as END of entire path
DevicePathValid	- Validate entire device path mult-instance
Verifies	each node length >= 4, no length overflow, ends with END
BOOLEAN	DevicePathValid(
DevicePathNodeLength	- Wrapper for GetDevicePathNodeLength with ASSERT
UINTN	DevicePathNodeLength(
DevicePathType	- Wrapper for GetDevicePathType with ASSERT
UINT8	DevicePathType(
DevicePathSubType	- Wrapper for GetDevicePathSubType with ASSERT
UINT8	DevicePathSubType(
SECTION	2: Device Path Node Construction Helpers
CreateDevicePathNode	- Allocate and initialize a device path node
SECTION	3: Device Path Manipulation (concatenate, append, etc.)
DevicePathStrSize	- Return total size of device path in bytes
UINTN	DevicePathStrSize(
Walk	to END node
DuplicateDevicePath	- Duplicate a device path
AppendDevicePath	- Concatenate two device paths
AppendDevicePathNode	- Append a single node to a device path
AppendDevicePathInstance	- Append a second multi-instance path
with	the END_INSTANCE separator
Overwrite	the final END_ENTIRE with END_INSTANCE
SetDevicePathEndInstance	*((EFI_DEVICE_PATH_PROTOCOL )Buffer - 1); /* actually set subtype /*
ExtractDevicePathInstanceFromText	- Split a multi-instance path
Returns	buffer of one instance and its size
Locate	the END node for this instance
Save	and override END subType for size calculation
Restore	and advance past END node
No	more instances
IsDevicePathMultiInstance	- Check if path has multiple instances
BOOLEAN	IsDevicePathMultiInstance(
DevicePathNodeInstanceContain	- Check if path contains END_INSTANCE
BOOLEAN	DevicePathNodeInstanceContain(
SECTION	4: Device Path To Text (DevicePathToText)
DevicePathToTextStr	- Convert a single device path node to text string
Lookup	in dispatch table based on Type/SubType
Default	conversion for unknown node types
String	= DefaultDevicePathToTextStr (DeviceNode, DisplayOnly, AllowShortcuts);
DevicePathToText	- Convert entire device path to text
This	is the main protocol function
Convert	each node via the type table, joining with L"/"
String	= DevicePathToTextStr (Node, DisplayOnly, AllowShortcuts);
DefaultDevicePathToTextStr	- Fallback conversion for unregistered types
CatDevicePathToTextStr	- Append formatted text to dynamic string
VOID	CatDevicePathToTextStr(
Calculate	needed size via SPrint
VA_END	(Args);
SECTION	5: Device Path From Text (DevicePathFromText)
DevicePathFromText	- Convert text representation to device path
Duplicate	the input string so we can tokenize it
WorkingStr	= StrAllocCopy (TextDevicePath);
Tokenize	by L'/' separator, convert each token
while	*(RemainingStr != L'\0') {**
Find	next node descriptor
NodeStr	= RemainingStr;
Convert	each token
RemainingStr	= WorkingStr;
Convert	the text token to a device path node
Node	= ConvertTextToDevicePathNode (NodeStr);
ConvertTextToDevicePathNode	- Dispatch text-to-node conversion
Based	on the text prefix (e.g., "Pci", "Acpi", "Usb", etc.)
Uses	a dispatch table matching known path type names.
Linear	search through conversion table
for	(i = 0; mFromTextTable[i].Function != NULL; i++) {
DevPathFromText	- Various node-from-text converter functions
Each	handles a specific device path node format string.
SECTION	6: Protocol Dispatch Tables
Device	Path Type table for DevicePathToText conversion
Maps	(Type, SubType) -> conversion function
TEXT_DEVICE_PATH_NODE_TABLE	mToTextTable[] = {
HARWARE	DEVICE PATHS (Type 1)
ACPI	DEVICE PATHS (Type 2)
ACPI	extended HID
ACPI	extended CID
MESSAGING	DEVICE PATHS (Type 3)
MEDIA	DEVICE PATHS (Type 4)
BBS	DEVICE PATHS (Type 5)
Device	Path From Text dispatch table
Maps	text prefix string -> conversion function pointer
TEXT_DEVICE_PATH_FROM_TEXT	mFromTextTable[] = {
VENDOR	table for VEN device path nodes
Compares	against known Vendor GUIDs for named text output
VENDOR_TABLE_ENTRY	mVendorTable[] = {
SECTION	7: Module Entry Point & Protocol Installation
Global	variables
EFI_HANDLE	mImageHandle = NULL;
Initialize	the HOB list pointer (for DXE drivers)
Status	= GetHobList ();
Install	the three Device Path protocols
Status	= gBootServices->InstallMultipleProtocolInterfaces (

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