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 22static inline __wsum 23csum_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