71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
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* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
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* Copyright (C) 2004 Microtronix Datacom Ltd.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_NIOS_CHECKSUM_H
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#define _ASM_NIOS_CHECKSUM_H
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/* Take these from lib/checksum.c */
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extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
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extern __sum16 ip_compute_csum(const void *buff, int len);
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/*
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* Fold a partial checksum
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*/
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static inline __sum16 csum_fold(__wsum sum)
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{
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__asm__ __volatile__(
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"add %0, %1, %0\n"
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"cmpltu r8, %0, %1\n"
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"srli %0, %0, 16\n"
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"add %0, %0, r8\n"
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"nor %0, %0, %0\n"
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: "=r" (sum)
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: "r" (sum << 16), "0" (sum)
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: "r8");
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return (__force __sum16) sum;
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}
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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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#define csum_tcpudp_nofold csum_tcpudp_nofold
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static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
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__u32 len, __u8 proto,
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__wsum sum)
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{
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__asm__ __volatile__(
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"add %0, %1, %0\n"
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"cmpltu r8, %0, %1\n"
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"add %0, %0, r8\n" /* add carry */
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"add %0, %2, %0\n"
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"cmpltu r8, %0, %2\n"
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"add %0, %0, r8\n" /* add carry */
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"add %0, %3, %0\n"
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"cmpltu r8, %0, %3\n"
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"add %0, %0, r8\n" /* add carry */
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: "=r" (sum), "=r" (saddr)
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: "r" (daddr), "r" ((len + proto) << 8),
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"0" (sum),
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"1" (saddr)
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: "r8");
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return sum;
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}
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static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
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__u32 len, __u8 proto,
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__wsum sum)
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{
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return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
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}
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#endif /* _ASM_NIOS_CHECKSUM_H */
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