feat: add ethernet & TCP/IP stack

2026-02-17 13:19:11 +01:00
parent f7e6ce70a0
commit 20fa8a9be2
23 changed files with 2409 additions and 0 deletions
@@ -0,0 +1,36 @@
+/*
+    * Ethernet.hpp
+    * Ethernet frame layer
+    * Copyright (c) 2025 Daniel Hammer
+*/
+
+#pragma once
+#include <cstdint>
+
+namespace Net::Ethernet {
+
+    constexpr uint16_t ETHERTYPE_IPV4 = 0x0800;
+    constexpr uint16_t ETHERTYPE_ARP  = 0x0806;
+
+    constexpr uint8_t BROADCAST_MAC[6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+
+    constexpr uint16_t HEADER_SIZE = 14;
+    constexpr uint16_t MAX_FRAME_SIZE = 1518;
+    constexpr uint16_t MAX_PAYLOAD_SIZE = MAX_FRAME_SIZE - HEADER_SIZE;
+
+    struct Header {
+        uint8_t  DestMac[6];
+        uint8_t  SrcMac[6];
+        uint16_t EtherType;
+    } __attribute__((packed));
+
+    // Initialize the Ethernet layer (hooks into E1000 RX path)
+    void Initialize();
+
+    // Send an Ethernet frame with the given EtherType and payload
+    bool Send(const uint8_t* destMac, uint16_t etherType, const uint8_t* payload, uint16_t payloadLen);
+
+    // Called by E1000 RX handler to dispatch received frames
+    void OnFrameReceived(const uint8_t* data, uint16_t length);
+
+}