7 * \defgroup uiparch Architecture specific uIP functions
10 * The functions in the architecture specific module implement the IP
11 * check sum and 32-bit additions.
13 * The IP checksum calculation is the most computationally expensive
14 * operation in the TCP/IP stack and it therefore pays off to
15 * implement this in efficient assembler. The purpose of the uip-arch
16 * module is to let the checksum functions to be implemented in
17 * architecture specific assembler.
23 * Declarations of architecture specific functions.
24 * \author Adam Dunkels <adam@dunkels.com>
28 * Copyright (c) 2001, Adam Dunkels.
29 * All rights reserved.
31 * Redistribution and use in source and binary forms, with or without
32 * modification, are permitted provided that the following conditions
34 * 1. Redistributions of source code must retain the above copyright
35 * notice, this list of conditions and the following disclaimer.
36 * 2. Redistributions in binary form must reproduce the above copyright
37 * notice, this list of conditions and the following disclaimer in the
38 * documentation and/or other materials provided with the distribution.
39 * 3. The name of the author may not be used to endorse or promote
40 * products derived from this software without specific prior
43 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
44 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
45 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
47 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
49 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
50 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
51 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
52 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
53 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
55 * This file is part of the uIP TCP/IP stack.
57 * $Id: uip_arch.h,v 1.2 2008/08/06 23:40:07 andrewlxia Exp $
61 #ifndef __UIP_ARCH_H__
62 #define __UIP_ARCH_H__
67 * Carry out a 32-bit addition.
69 * Because not all architectures for which uIP is intended has native
70 * 32-bit arithmetic, uIP uses an external C function for doing the
71 * required 32-bit additions in the TCP protocol processing. This
72 * function should add the two arguments and place the result in the
73 * global variable uip_acc32.
75 * \note The 32-bit integer pointed to by the op32 parameter and the
76 * result in the uip_acc32 variable are in network byte order (big
79 * \param op32 A pointer to a 4-byte array representing a 32-bit
80 * integer in network byte order (big endian).
82 * \param op16 A 16-bit integer in host byte order.
84 void uip_add32(u8_t *op32, u16_t op16);
87 * Calculate the Internet checksum over a buffer.
89 * The Internet checksum is the one's complement of the one's
90 * complement sum of all 16-bit words in the buffer.
94 * \note This function is not called in the current version of uIP,
95 * but future versions might make use of it.
97 * \param buf A pointer to the buffer over which the checksum is to be
100 * \param len The length of the buffer over which the checksum is to
103 * \return The Internet checksum of the buffer.
105 u16_t uip_chksum(u16_t *buf, u16_t len);
108 * Calculate the IP header checksum of the packet header in uip_buf.
110 * The IP header checksum is the Internet checksum of the 20 bytes of
113 * \return The IP header checksum of the IP header in the uip_buf
116 u16_t uip_ipchksum(void);
119 * Calculate the TCP checksum of the packet in uip_buf and uip_appdata.
121 * The TCP checksum is the Internet checksum of data contents of the
122 * TCP segment, and a pseudo-header as defined in RFC793.
124 * \note The uip_appdata pointer that points to the packet data may
125 * point anywhere in memory, so it is not possible to simply calculate
126 * the Internet checksum of the contents of the uip_buf buffer.
128 * \return The TCP checksum of the TCP segment in uip_buf and pointed
131 u16_t uip_tcpchksum(void);
133 u16_t uip_udpchksum(void);
138 #endif /* __UIP_ARCH_H__ */