diff --git a/apkverity/src/loopdevice/sys.rs b/apkverity/src/loopdevice/sys.rs
new file mode 100644
index 0000000..2d4977b
--- /dev/null
+++ b/apkverity/src/loopdevice/sys.rs
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+use bitflags::bitflags;
+
+// This UAPI is copied and converted from include/uapi/linux/loop.h Note that this module doesn't
+// implement all the features introduced in loop(4). Only the features that are required to support
+// the `apkdmverity` use cases are implemented.
+
+pub const LOOP_CONTROL: &str = "/dev/loop-control";
+
+pub const LOOP_CTL_GET_FREE: libc::c_ulong = 0x4C82;
+pub const LOOP_CONFIGURE: libc::c_ulong = 0x4C0A;
+pub const LOOP_CLR_FD: libc::c_ulong = 0x4C01;
+
+#[repr(C)]
+pub struct loop_config {
+    pub fd: u32,
+    pub block_size: u32,
+    pub info: loop_info64,
+    pub reserved: [u64; 8],
+}
+
+#[repr(C)]
+pub struct loop_info64 {
+    pub lo_device: u64,
+    pub lo_inode: u64,
+    pub lo_rdevice: u64,
+    pub lo_offset: u64,
+    pub lo_sizelimit: u64,
+    pub lo_number: u32,
+    pub lo_encrypt_type: u32,
+    pub lo_encrypt_key_size: u32,
+    pub lo_flags: Flag,
+    pub lo_file_name: [u8; LO_NAME_SIZE],
+    pub lo_crypt_name: [u8; LO_NAME_SIZE],
+    pub lo_encrypt_key: [u8; LO_KEY_SIZE],
+    pub lo_init: [u64; 2],
+}
+
+bitflags! {
+    pub struct Flag: u32 {
+        const LO_FLAGS_READ_ONLY = 1 << 0;
+        const LO_FLAGS_AUTOCLEAR = 1 << 2;
+        const LO_FLAGS_PARTSCAN = 1 << 3;
+        const LO_FLAGS_DIRECT_IO = 1 << 4;
+    }
+}
+
+pub const LO_NAME_SIZE: usize = 64;
+pub const LO_KEY_SIZE: usize = 32;