libdb/uIP/uip_arch.h

   1 /**
   2  * \defgroup uiparch Architecture specific uIP functions
   3  * @{
   4  *
   5  * The functions in the architecture specific module implement the IP
   6  * check sum and 32-bit additions.
   7  *
   8  * The IP checksum calculation is the most computationally expensive
   9  * operation in the TCP/IP stack and it therefore pays off to
  10  * implement this in efficient assembler. The purpose of the uip-arch
  11  * module is to let the checksum functions to be implemented in
  12  * architecture specific assembler.
  13  *
  14  */
  15
  16 /**
  17  * \file
  18  * Declarations of architecture specific functions.
  19  * \author Adam Dunkels <adam@dunkels.com>
  20  */
  21
  22 /*
  23  * Copyright (c) 2001, Adam Dunkels.
  24  * All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. The name of the author may not be used to endorse or promote
  35  *    products derived from this software without specific prior
  36  *    written permission.
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  39  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  40  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  41  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  42  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  43  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  44  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  45  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  46  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  47  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  48  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  49  *
  50  * This file is part of the uIP TCP/IP stack.
  51  *
  52  *
  53  */
  54
  55 #ifndef __UIP_ARCH_H__
  56 #define __UIP_ARCH_H__
  57
  58 #include "uip.h"
  59
  60 #define UIP_MIN(x,y)                    (x)<(y)?(x):(y)
  61
  62 #define MEM_ALIGNMENT                   4
  63 #define MEM_ALIGN(mem)                  ((void*)(((u32_t)(mem)+MEM_ALIGNMENT-1)&~(u32_t)(MEM_ALIGNMENT-1)))
  64 #define MEM_ALIGN_SIZE(size)    (((size)+MEM_ALIGNMENT-1)&~(u32_t)(MEM_ALIGNMENT-1))
  65
  66 #define PACK_STRUCT_STRUCT              __attribute__((packed))
  67 #define PACK_STRUCT_FIELD(x)    x
  68 #define PACK_STRUCT_BEGIN
  69 #define PACK_STRUCT_END
  70
  71 #ifndef htons
  72 #define htons(x) (x)
  73 #endif
  74 #ifndef ntohs
  75 #define ntohs(x) (x)
  76 #endif
  77 #ifndef htonl
  78 #define htonl(x) (x)
  79 #endif
  80 #ifndef ntohl
  81 #define ntohl(x) (x)
  82 #endif
  83
  84 struct uip_pbuf;
  85 struct uip_ip_addr;
  86
  87 /**
  88  * Calculate the Internet checksum over a buffer.
  89  *
  90  * The Internet checksum is the one's complement of the one's
  91  * complement sum of all 16-bit words in the buffer.
  92  *
  93  * See RFC1071.
  94  *
  95  * \note This function is not called in the current version of uIP,
  96  * but future versions might make use of it.
  97  *
  98  * \param buf A pointer to the buffer over which the checksum is to be
  99  * computed.
 100  *
 101  * \param len The length of the buffer over which the checksum is to
 102  * be computed.
 103  *
 104  * \return The Internet checksum of the buffer.
 105  */
 106 u16_t uip_chksum(u16_t *buf, u32_t len);
 107
 108 /**
 109  * Calculate the IP header checksum of the packet header in uip_buf.
 110  *
 111  * The IP header checksum is the Internet checksum of the 20 bytes of
 112  * the IP header.
 113  *
 114  * \return The IP header checksum of the IP header in the uip_buf
 115  * buffer.
 116  */
 117 u16_t uip_ipchksum(void *dataptr,u16_t len);
 118
 119 u16_t uip_ipchksum_pbuf(struct uip_pbuf *p);
 120
 121 /**
 122  * Calculate the TCP checksum of the packet in uip_buf and uip_appdata.
 123  *
 124  * The TCP checksum is the Internet checksum of data contents of the
 125  * TCP segment, and a pseudo-header as defined in RFC793.
 126  *
 127  * \note The uip_appdata pointer that points to the packet data may
 128  * point anywhere in memory, so it is not possible to simply calculate
 129  * the Internet checksum of the contents of the uip_buf buffer.
 130  *
 131  * \return The TCP checksum of the TCP segment in uip_buf and pointed
 132  * to by uip_appdata.
 133  */
 134 u16_t uip_chksum_pseudo(struct uip_pbuf *p,struct uip_ip_addr *src,struct uip_ip_addr *dst,u8_t proto,u16_t proto_len);
 135
 136
 137
 138 extern void tcpip_tmr_needed();
 139 #define tcp_tmr_needed          tcpip_tmr_needed
 140
 141 #if UIP_LIBC_MEMFUNCREPLACE
 142 static __inline__ void uip_memcpy(void *dest,const void *src,s32_t len)
 143 {
 144         u8_t *dest0 = (u8_t*)dest;
 145         u8_t *src0 = (u8_t*)src;
 146
 147         while(len--) {
 148                 *dest0++ = *src0++;
 149         }
 150 }
 151
 152 static __inline__ void uip_memset(void *dest,s32_t c,s32_t len)
 153 {
 154         u8_t *dest0 = (u8_t*)dest;
 155
 156         while(len--) {
 157                 *dest0++ = (s8_t)c;
 158         }
 159 }
 160
 161 #define UIP_MEMCPY                              uip_memcpy
 162 #define UIP_MEMSET                              uip_memset
 163 #else
 164 #define UIP_MEMCPY                              memcpy
 165 #define UIP_MEMSET                              memset
 166 #endif
 167
 168 /** @} */
 169
 170 #endif /* __UIP_ARCH_H__ */