src/boot/efi/disk.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify it
   3  * under the terms of the GNU Lesser General Public License as published by
   4  * the Free Software Foundation; either version 2.1 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful, but
   8  * WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10  * Lesser General Public License for more details.
  11  *
  12  * Copyright (C) 2015 Kay Sievers <kay@vrfy.org>
  13  */
  14
  15 #include <efi.h>
  16 #include <efilib.h>
  17
  18 #include "util.h"
  19
  20 EFI_STATUS disk_get_part_uuid(EFI_HANDLE *handle, CHAR16 uuid[37]) {
  21         EFI_DEVICE_PATH *device_path;
  22         EFI_STATUS r = EFI_NOT_FOUND;
  23
  24         /* export the device path this image is started from */
  25         device_path = DevicePathFromHandle(handle);
  26         if (device_path) {
  27                 EFI_DEVICE_PATH *path, *paths;
  28
  29                 paths = UnpackDevicePath(device_path);
  30                 for (path = paths; !IsDevicePathEnd(path); path = NextDevicePathNode(path)) {
  31                         HARDDRIVE_DEVICE_PATH *drive;
  32
  33                         if (DevicePathType(path) != MEDIA_DEVICE_PATH)
  34                                 continue;
  35                         if (DevicePathSubType(path) != MEDIA_HARDDRIVE_DP)
  36                                 continue;
  37                         drive = (HARDDRIVE_DEVICE_PATH *)path;
  38                         if (drive->SignatureType != SIGNATURE_TYPE_GUID)
  39                                 continue;
  40
  41                         GuidToString(uuid, (EFI_GUID *)&drive->Signature);
  42                         r = EFI_SUCCESS;
  43                         break;
  44                 }
  45                 FreePool(paths);
  46         }
  47
  48         return r;
  49 }