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TOMOYO Linux Cross Reference
Linux/arch/unicore32/include/asm/checksum.h

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  1 /*
  2  * linux/arch/unicore32/include/asm/checksum.h
  3  *
  4  * Code specific to PKUnity SoC and UniCore ISA
  5  *
  6  * Copyright (C) 2001-2010 GUAN Xue-tao
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  *
 12  * IP checksum routines
 13  */
 14 #ifndef __UNICORE_CHECKSUM_H__
 15 #define __UNICORE_CHECKSUM_H__
 16 
 17 /*
 18  * computes the checksum of the TCP/UDP pseudo-header
 19  * returns a 16-bit checksum, already complemented
 20  */
 21 
 22 static inline __wsum
 23 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
 24                    unsigned short proto, __wsum sum)
 25 {
 26         __asm__(
 27         "add.a  %0, %1, %2\n"
 28         "addc.a %0, %0, %3\n"
 29         "addc.a %0, %0, %4 << #8\n"
 30         "addc.a %0, %0, %5\n"
 31         "addc   %0, %0, #0\n"
 32         : "=&r"(sum)
 33         : "r" (sum), "r" (daddr), "r" (saddr), "r" (len), "Ir" (htons(proto))
 34         : "cc");
 35         return sum;
 36 }
 37 #define csum_tcpudp_nofold      csum_tcpudp_nofold
 38 
 39 #include <asm-generic/checksum.h>
 40 
 41 #endif
 42 

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