Moved "hello world" protocol implementation out of prototester.c and into

the first standalong uIP-based protocol module.

src/include/gpxe/hello.h

@@ -0,0 +1,46 @@
+#ifndef _HELLO_H
+#define _HELLO_H
+
+/** @file
+ *
+ * "Hello world" TCP protocol
+ *
+ */
+
+#include <stdint.h>
+#include <gpxe/tcp.h>
+
+enum hello_state {
+	HELLO_SENDING_MESSAGE = 1,
+	HELLO_SENDING_ENDL,
+};
+
+/**
+ * A "hello world" request
+ *
+ */
+struct hello_request {
+	/** TCP connection for this request */
+	struct tcp_connection tcp;
+	/** Current state */
+	enum hello_state state;
+	/** Message to be transmitted */
+	const char *message;
+	/** Amount of message remaining to be transmitted */
+	size_t remaining;
+	/** Callback function
+	 *
+	 * @v data	Received data
+	 * @v len	Length of received data
+	 *
+	 * This function is called for all data received from the
+	 * remote server.
+	 */
+	void ( *callback ) ( char *data, size_t len );
+	/** Connection complete indicator */
+	int complete;
+};
+
+extern int hello_connect ( struct hello_request *hello );
+
+#endif