/** * \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 1.1.2.2 2003/10/06 15:10:22 adam Exp $ * */#ifndef __UIP_ARCH_H__#define __UIP_ARCH_H__#include "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);/** @} */#endif /* __UIP_ARCH_H__ */