initial import from picomap firmware

include/net.h

@@ -0,0 +1,27 @@
+#pragma once
+#include <cstdint>
+#include <span>
+#include "eth.h"
+#include "ipv4.h"
+#include "span_writer.h"
+#include "callback_list.h"
+
+struct net_state {
+    eth::mac_addr mac;
+    ipv4::ip4_addr ip;
+};
+
+using net_frame_callback = bool (*)(std::span<const uint8_t> frame);
+
+using frame_cb_list = callback_list<net_frame_callback, 16>;
+using frame_cb_handle = frame_cb_list::node*;
+
+using ethertype_handler = void (*)(std::span<const uint8_t> frame, span_writer& tx);
+
+bool net_init();
+const net_state& net_get_state();
+frame_cb_handle net_add_frame_callback(net_frame_callback cb);
+void net_remove_frame_callback(frame_cb_handle h);
+void net_poll(std::span<uint8_t> tx);
+void net_send_raw(std::span<const uint8_t> data);
+void net_register_ethertype(uint16_t ethertype_be, ethertype_handler fn);