42 lines
978 B
C
42 lines
978 B
C
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/*
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* linux/arch/unicore32/include/asm/checksum.h
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* IP checksum routines
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*/
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#ifndef __UNICORE_CHECKSUM_H__
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#define __UNICORE_CHECKSUM_H__
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/*
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* computes the checksum of the TCP/UDP pseudo-header
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* returns a 16-bit checksum, already complemented
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*/
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static inline __wsum
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csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
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__u8 proto, __wsum sum)
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{
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__asm__(
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"add.a %0, %1, %2\n"
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"addc.a %0, %0, %3\n"
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"addc.a %0, %0, %4 << #8\n"
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"addc.a %0, %0, %5\n"
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"addc %0, %0, #0\n"
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: "=&r"(sum)
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: "r" (sum), "r" (daddr), "r" (saddr), "r" (len), "Ir" (htons(proto))
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: "cc");
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return sum;
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}
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#define csum_tcpudp_nofold csum_tcpudp_nofold
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#include <asm-generic/checksum.h>
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#endif
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