feat: scheduling, usermode, shell

kernel/src/Net/Ipv4.hpp

@@ -36,9 +36,14 @@ namespace Net::Ipv4 {
     // Handle an incoming IP packet (called by Ethernet layer)
     void OnPacketReceived(const uint8_t* data, uint16_t length);
 
-    // Send an IP packet with the given protocol and payload
+    // Send an IP packet with the given protocol and payload.
+    // If ARP resolution is pending, the packet is queued and sent when the reply arrives.
     bool Send(uint32_t destIp, uint8_t protocol, const uint8_t* payload, uint16_t payloadLen);
 
+    // Flush any packets that were waiting for ARP resolution.
+    // Called by the ARP layer when a new cache entry is inserted.
+    void FlushPending();
+
     // Compute the Internet checksum over a buffer
     uint16_t Checksum(const void* data, uint16_t length);