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/*
* linux/arch/unicore32/include/asm/checksum.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* IP checksum routines
*/
#ifndef __UNICORE_CHECKSUM_H__
#define __UNICORE_CHECKSUM_H__
/*
* computes the checksum of the TCP/UDP pseudo-header
* returns a 16-bit checksum, already complemented
*/
static inline __wsum
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
unsigned short proto, __wsum sum)
{
__asm__(
"add.a %0, %1, %2\n"
"addc.a %0, %0, %3\n"
"addc.a %0, %0, %4 << #8\n"
"addc.a %0, %0, %5\n"
"addc %0, %0, #0\n"
: "=&r"(sum)
: "r" (sum), "r" (daddr), "r" (saddr), "r" (len), "Ir" (htons(proto))
: "cc");
return sum;
}
#define csum_tcpudp_nofold csum_tcpudp_nofold
#include <asm-generic/checksum.h>
#endif