src/boot/efi/disk.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /*
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU Lesser General Public License as published by
   6  * the Free Software Foundation; either version 2.1 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * Copyright (C) 2015 Kay Sievers <kay@vrfy.org>
  15  */
  16
  17 #include <efi.h>
  18 #include <efilib.h>
  19
  20 #include "util.h"
  21
  22 EFI_STATUS disk_get_part_uuid(EFI_HANDLE *handle, CHAR16 uuid[37]) {
  23         EFI_DEVICE_PATH *device_path;
  24         EFI_STATUS r = EFI_NOT_FOUND;
  25
  26         /* export the device path this image is started from */
  27         device_path = DevicePathFromHandle(handle);
  28         if (device_path) {
  29                 EFI_DEVICE_PATH *path, *paths;
  30
  31                 paths = UnpackDevicePath(device_path);
  32                 for (path = paths; !IsDevicePathEnd(path); path = NextDevicePathNode(path)) {
  33                         HARDDRIVE_DEVICE_PATH *drive;
  34
  35                         if (DevicePathType(path) != MEDIA_DEVICE_PATH)
  36                                 continue;
  37                         if (DevicePathSubType(path) != MEDIA_HARDDRIVE_DP)
  38                                 continue;
  39                         drive = (HARDDRIVE_DEVICE_PATH *)path;
  40                         if (drive->SignatureType != SIGNATURE_TYPE_GUID)
  41                                 continue;
  42
  43                         GuidToString(uuid, (EFI_GUID *)&drive->Signature);
  44                         r = EFI_SUCCESS;
  45                         break;
  46                 }
  47                 FreePool(paths);
  48         }
  49
  50         return r;
  51 }