src/boot/efi/disk.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <efi.h>
   4 #include <efilib.h>
   5
   6 #include "util.h"
   7
   8 EFI_STATUS disk_get_part_uuid(EFI_HANDLE *handle, CHAR16 uuid[37]) {
   9         EFI_DEVICE_PATH *device_path;
  10
  11         /* export the device path this image is started from */
  12         device_path = DevicePathFromHandle(handle);
  13         if (device_path) {
  14                 _cleanup_freepool_ EFI_DEVICE_PATH *paths = NULL;
  15                 EFI_DEVICE_PATH *path;
  16
  17                 paths = UnpackDevicePath(device_path);
  18                 for (path = paths; !IsDevicePathEnd(path); path = NextDevicePathNode(path)) {
  19                         HARDDRIVE_DEVICE_PATH *drive;
  20
  21                         if (DevicePathType(path) != MEDIA_DEVICE_PATH)
  22                                 continue;
  23                         if (DevicePathSubType(path) != MEDIA_HARDDRIVE_DP)
  24                                 continue;
  25                         drive = (HARDDRIVE_DEVICE_PATH *)path;
  26                         if (drive->SignatureType != SIGNATURE_TYPE_GUID)
  27                                 continue;
  28
  29                         GuidToString(uuid, (EFI_GUID *)&drive->Signature);
  30                         return EFI_SUCCESS;
  31                 }
  32         }
  33
  34         return EFI_NOT_FOUND;
  35 }