+//
+// firmware device path discovery
+//
+
+static UINT8 LegacyLoaderMediaPathData[] = {
+ 0x04, 0x06, 0x14, 0x00, 0xEB, 0x85, 0x05, 0x2B,
+ 0xB8, 0xD8, 0xA9, 0x49, 0x8B, 0x8C, 0xE2, 0x1B,
+ 0x01, 0xAE, 0xF2, 0xB7, 0x7F, 0xFF, 0x04, 0x00,
+};
+static EFI_DEVICE_PATH *LegacyLoaderMediaPath = (EFI_DEVICE_PATH *)LegacyLoaderMediaPathData;
+
+static VOID ExtractLegacyLoaderPaths(EFI_DEVICE_PATH **PathList, UINTN MaxPaths, EFI_DEVICE_PATH **HardcodedPathList)
+{
+ EFI_STATUS Status;
+ UINTN HandleCount = 0;
+ UINTN HandleIndex, HardcodedIndex;
+ EFI_HANDLE *Handles;
+ EFI_HANDLE Handle;
+ UINTN PathCount = 0;
+ UINTN PathIndex;
+ EFI_LOADED_IMAGE *LoadedImage;
+ EFI_DEVICE_PATH *DevicePath;
+ BOOLEAN Seen;
+
+ MaxPaths--; // leave space for the terminating NULL pointer
+
+ // get all LoadedImage handles
+ Status = LibLocateHandle(ByProtocol, &LoadedImageProtocol, NULL, &HandleCount, &Handles);
+ if (CheckError(Status, L"while listing LoadedImage handles")) {
+ if (HardcodedPathList) {
+ for (HardcodedIndex = 0; HardcodedPathList[HardcodedIndex] && PathCount < MaxPaths; HardcodedIndex++)
+ PathList[PathCount++] = HardcodedPathList[HardcodedIndex];
+ }
+ PathList[PathCount] = NULL;
+ return;
+ }
+ for (HandleIndex = 0; HandleIndex < HandleCount && PathCount < MaxPaths; HandleIndex++) {
+ Handle = Handles[HandleIndex];
+
+ Status = refit_call3_wrapper(BS->HandleProtocol, Handle, &LoadedImageProtocol, (VOID **) &LoadedImage);
+ if (EFI_ERROR(Status))
+ continue; // This can only happen if the firmware scewed up, ignore it.
+
+ Status = refit_call3_wrapper(BS->HandleProtocol, LoadedImage->DeviceHandle, &DevicePathProtocol, (VOID **) &DevicePath);
+ if (EFI_ERROR(Status))
+ continue; // This happens, ignore it.
+
+ // Only grab memory range nodes
+ if (DevicePathType(DevicePath) != HARDWARE_DEVICE_PATH || DevicePathSubType(DevicePath) != HW_MEMMAP_DP)
+ continue;
+
+ // Check if we have this device path in the list already
+ // WARNING: This assumes the first node in the device path is unique!
+ Seen = FALSE;
+ for (PathIndex = 0; PathIndex < PathCount; PathIndex++) {
+ if (DevicePathNodeLength(DevicePath) != DevicePathNodeLength(PathList[PathIndex]))
+ continue;
+ if (CompareMem(DevicePath, PathList[PathIndex], DevicePathNodeLength(DevicePath)) == 0) {
+ Seen = TRUE;
+ break;
+ }
+ }
+ if (Seen)
+ continue;
+
+ PathList[PathCount++] = AppendDevicePath(DevicePath, LegacyLoaderMediaPath);
+ }
+ MyFreePool(Handles);
+
+ if (HardcodedPathList) {
+ for (HardcodedIndex = 0; HardcodedPathList[HardcodedIndex] && PathCount < MaxPaths; HardcodedIndex++)
+ PathList[PathCount++] = HardcodedPathList[HardcodedIndex];
+ }
+ PathList[PathCount] = NULL;
+} /* VOID ExtractLegacyLoaderPaths() */
+