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| /** |
| * \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__ */ |