AnalyzeHardDiskDevPath.c

#include <Uefi.h>
#include <Base.h>
#include <Library/UefiLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/PrintLib.h>
#include <Protocol/DiskIo.h>
#include <Protocol/BlockIo.h>
#include <Protocol/DevicePath.h>
#include <Protocol/DevicePathToText.h>
#include <Uefi/UefiGpt.h>
#include <Library/DevicePathLib.h>

EFI_STATUS PrintNode(EFI_DEVICE_PATH_PROTOCOL * Node)
{
	Print(L"(%d %d)/", Node->Type, Node->SubType);
	return 0;
}
EFI_DEVICE_PATH_PROTOCOL* WalkthroughDevicePath(EFI_DEVICE_PATH_PROTOCOL* DevPath,EFI_STATUS (*Callbk)(EFI_DEVICE_PATH_PROTOCOL*))
{
	EFI_DEVICE_PATH_PROTOCOL* pDevPath = DevPath;
	while(!IsDevicePathEnd(pDevPath))
	{
		if(Callbk)
		{
			EFI_STATUS Status = Callbk(pDevPath);
			if(Status != 0)
			{
				if(Status < 0)
					pDevPath = NULL;
				break;
			}
		}
		pDevPath = NextDevicePathNode(pDevPath); 
	}
	return pDevPath;
}
EFI_STATUS UefiMain(IN EFI_HANDLE ImageHandle,IN EFI_SYSTEM_TABLE *SystemTable)
{
	EFI_STATUS Status;
	UINTN HandleIndex,NumHandle;
	EFI_HANDLE *ControllerHandle;
	EFI_DEVICE_PATH_TO_TEXT_PROTOCOL* Device2TextProtocol;

	ControllerHandle = 0;
	Device2TextProtocol = 0;

	//find DevicePathToTextProtocol
	Status = gBS->LocateProtocol(&gEfiDevicePathToTextProtocolGuid, \
		NULL, \
		&Device2TextProtocol);
	// find all diskio's device
	Status = gBS->LocateHandleBuffer(ByProtocol, \
		&gEfiDiskIoProtocolGuid, \
		NULL, \
		&NumHandle, \
		&ControllerHandle);
	if (EFI_ERROR(Status))
	{
		return Status;
	}
	//for everyone diskio device,open the device's DevicePathProtocol
	for (HandleIndex = 0;HandleIndex < NumHandle;HandleIndex++)
	{
		EFI_DEVICE_PATH_PROTOCOL *DiskDevicePath;
		Status = gBS->OpenProtocol(ControllerHandle[HandleIndex], \
			&gEfiDevicePathProtocolGuid, \
			&DiskDevicePath, \
			gImageHandle, \
			NULL, \
			EFI_OPEN_PROTOCOL_GET_PROTOCOL);
		if (EFI_ERROR(Status))
		{
			continue;
		}
		//device path to string
		{
			CHAR16* TextDevicePath = 0;
			TextDevicePath = Device2TextProtocol->ConvertDevicePathToText(DiskDevicePath, \
				TRUE, \
				TRUE);
			Print(L"%s\n",TextDevicePath);
			if (TextDevicePath)
			{
				gBS->FreePool(TextDevicePath);
			}
		}
		WalkthroughDevicePath(DiskDevicePath,PrintNode);
		//enum device path in DiskDevicePath everyone device node
		Print(L"\n\n");
	}
	return 0;
}