sd-boot: stub - export LoaderDevicePartUUID

1 files changed, 51 insertions, 0 deletions

diff --git a/src/boot/efi/disk.c b/src/boot/efi/disk.c
new file mode 100644
index 0000000000..96063fbc28
--- /dev/null
+++ b/src/boot/efi/disk.c
@@ -0,0 +1,51 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * Copyright (C) 2015 Kay Sievers <kay@vrfy.org>
+ */
+
+#include <efi.h>
+#include <efilib.h>
+
+#include "util.h"
+
+EFI_STATUS disk_get_part_uuid(EFI_HANDLE *handle, CHAR16 uuid[37]) {
+        EFI_DEVICE_PATH *device_path;
+        EFI_STATUS r = EFI_NOT_FOUND;
+
+        /* export the device path this image is started from */
+        device_path = DevicePathFromHandle(handle);
+        if (device_path) {
+                EFI_DEVICE_PATH *path, *paths;
+
+                paths = UnpackDevicePath(device_path);
+                for (path = paths; !IsDevicePathEnd(path); path = NextDevicePathNode(path)) {
+                        HARDDRIVE_DEVICE_PATH *drive;
+
+                        if (DevicePathType(path) != MEDIA_DEVICE_PATH)
+                                continue;
+                        if (DevicePathSubType(path) != MEDIA_HARDDRIVE_DP)
+                                continue;
+                        drive = (HARDDRIVE_DEVICE_PATH *)path;
+                        if (drive->SignatureType != SIGNATURE_TYPE_GUID)
+                                continue;
+
+                        GuidToString(uuid, (EFI_GUID *)&drive->Signature);
+                        r = EFI_SUCCESS;
+                        break;
+                }
+                FreePool(paths);
+        }
+
+        return r;
+}