Move smoltcp-related code to bigtcp

kernel/libs/aster-bigtcp/src/lib.rs

@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: MPL-2.0
+
+//! _bigtcp_ is a crate that wraps [`smoltcp`].
+//!
+//! [`smoltcp`] is designed for embedded systems where the number of sockets is always small. It
+//! turns out that such a design cannot satisfy the need to implement the network stack of a
+//! general-purpose OS kernel, in terms of flexibility and efficiency.
+//!
+//! The short-term goal of _bigtcp_ is to reuse the powerful TCP implementation of _smoltcp_, while
+//! reimplementing Ethernet and IP protocols to increase the flexibility and performance of packet
+//! dispatching.
+
+#![no_std]
+#![deny(unsafe_code)]
+#![feature(btree_extract_if)]
+
+pub mod device;
+pub mod errors;
+pub mod iface;
+pub mod socket;
+pub mod wire;
+
+extern crate alloc;