src/boot/efi/disk.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /*
   3  * This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the GNU Lesser General Public License as published by
   5  * the Free Software Foundation; either version 2.1 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * Copyright (C) 2015 Kay Sievers <kay@vrfy.org>
  14  */
  15
  16 #include <efi.h>
  17 #include <efilib.h>
  18
  19 #include "util.h"
  20
  21 EFI_STATUS disk_get_part_uuid(EFI_HANDLE *handle, CHAR16 uuid[37]) {
  22         EFI_DEVICE_PATH *device_path;
  23
  24         /* export the device path this image is started from */
  25         device_path = DevicePathFromHandle(handle);
  26         if (device_path) {
  27                 _cleanup_freepool_ EFI_DEVICE_PATH *paths = NULL;
  28                 EFI_DEVICE_PATH *path;
  29
  30                 paths = UnpackDevicePath(device_path);
  31                 for (path = paths; !IsDevicePathEnd(path); path = NextDevicePathNode(path)) {
  32                         HARDDRIVE_DEVICE_PATH *drive;
  33
  34                         if (DevicePathType(path) != MEDIA_DEVICE_PATH)
  35                                 continue;
  36                         if (DevicePathSubType(path) != MEDIA_HARDDRIVE_DP)
  37                                 continue;
  38                         drive = (HARDDRIVE_DEVICE_PATH *)path;
  39                         if (drive->SignatureType != SIGNATURE_TYPE_GUID)
  40                                 continue;
  41
  42                         GuidToString(uuid, (EFI_GUID *)&drive->Signature);
  43                         return EFI_SUCCESS;
  44                 }
  45         }
  46
  47         return EFI_NOT_FOUND;
  48 }