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diff --git a/geekos/include/uip/uip_arch.h b/geekos/include/uip/uip_arch.h
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+/**
+ * \addtogroup uip
+ * {@
+ */
+
+/**
+ * \defgroup uiparch Architecture specific uIP functions
+ * @{
+ *
+ * The functions in the architecture specific module implement the IP
+ * check sum and 32-bit additions.
+ *
+ * The IP checksum calculation is the most computationally expensive
+ * operation in the TCP/IP stack and it therefore pays off to
+ * implement this in efficient assembler. The purpose of the uip-arch
+ * module is to let the checksum functions to be implemented in
+ * architecture specific assembler.
+ *
+ */
+
+/**
+ * \file
+ * Declarations of architecture specific functions.
+ * \author Adam Dunkels <adam@dunkels.com>
+ */
+
+/*
+ * Copyright (c) 2001, Adam Dunkels.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This file is part of the uIP TCP/IP stack.
+ *
+ * $Id: uip_arch.h,v 1.2 2008/08/06 23:40:07 andrewlxia Exp $
+ *
+ */
+
+#ifndef __UIP_ARCH_H__
+#define __UIP_ARCH_H__
+
+#include <uip/uip.h>
+
+/**
+ * Carry out a 32-bit addition.
+ *
+ * Because not all architectures for which uIP is intended has native
+ * 32-bit arithmetic, uIP uses an external C function for doing the
+ * required 32-bit additions in the TCP protocol processing. This
+ * function should add the two arguments and place the result in the
+ * global variable uip_acc32.
+ *
+ * \note The 32-bit integer pointed to by the op32 parameter and the
+ * result in the uip_acc32 variable are in network byte order (big
+ * endian).
+ *
+ * \param op32 A pointer to a 4-byte array representing a 32-bit
+ * integer in network byte order (big endian).
+ *
+ * \param op16 A 16-bit integer in host byte order.
+ */
+void uip_add32(u8_t *op32, u16_t op16);
+
+/**
+ * Calculate the Internet checksum over a buffer.
+ *
+ * The Internet checksum is the one's complement of the one's
+ * complement sum of all 16-bit words in the buffer.
+ *
+ * See RFC1071.
+ *
+ * \note This function is not called in the current version of uIP,
+ * but future versions might make use of it.
+ *
+ * \param buf A pointer to the buffer over which the checksum is to be
+ * computed.
+ *
+ * \param len The length of the buffer over which the checksum is to
+ * be computed.
+ *
+ * \return The Internet checksum of the buffer.
+ */
+u16_t uip_chksum(u16_t *buf, u16_t len);
+
+/**
+ * Calculate the IP header checksum of the packet header in uip_buf.
+ *
+ * The IP header checksum is the Internet checksum of the 20 bytes of
+ * the IP header.
+ *
+ * \return The IP header checksum of the IP header in the uip_buf
+ * buffer.
+ */
+u16_t uip_ipchksum(void);
+
+/**
+ * Calculate the TCP checksum of the packet in uip_buf and uip_appdata.
+ *
+ * The TCP checksum is the Internet checksum of data contents of the
+ * TCP segment, and a pseudo-header as defined in RFC793.
+ *
+ * \note The uip_appdata pointer that points to the packet data may
+ * point anywhere in memory, so it is not possible to simply calculate
+ * the Internet checksum of the contents of the uip_buf buffer.
+ *
+ * \return The TCP checksum of the TCP segment in uip_buf and pointed
+ * to by uip_appdata.
+ */
+u16_t uip_tcpchksum(void);
+
+u16_t uip_udpchksum(void);
+
+/** @} */
+/** @} */
+
+#endif /* __UIP_ARCH_H__ */