87 строки
2.2 KiB
C
87 строки
2.2 KiB
C
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/* MN10300 Optimised checksumming code
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_CHECKSUM_H
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#define _ASM_CHECKSUM_H
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extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
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int len, __wsum sum);
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extern __wsum csum_partial_copy_from_user(const void *src, void *dst,
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int len, __wsum sum,
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int *err_ptr);
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extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
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extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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extern __sum16 ip_compute_csum(const void *buff, int len);
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#define csum_partial_copy_fromuser csum_partial_copy
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extern __wsum csum_partial_copy(const void *src, void *dst, int len,
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__wsum sum);
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static inline __sum16 csum_fold(__wsum sum)
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{
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asm(
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" add %1,%0 \n"
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" addc 0xffff,%0 \n"
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: "=r" (sum)
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: "r" (sum << 16), "0" (sum & 0xffff0000)
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: "cc"
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);
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return (~sum) >> 16;
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}
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static inline __wsum csum_tcpudp_nofold(unsigned long saddr,
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unsigned long daddr,
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unsigned short len,
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unsigned short proto,
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__wsum sum)
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{
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__wsum tmp;
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tmp = (__wsum) ntohs(len) << 16;
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tmp += (__wsum) proto << 8;
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asm(
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" add %1,%0 \n"
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" addc %2,%0 \n"
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" addc %3,%0 \n"
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" addc 0,%0 \n"
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: "=r" (sum)
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: "r" (daddr), "r"(saddr), "r"(tmp), "0"(sum)
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: "cc"
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);
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return 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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static inline __sum16 csum_tcpudp_magic(unsigned long saddr,
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unsigned long daddr,
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unsigned short len,
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unsigned short 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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#undef _HAVE_ARCH_IPV6_CSUM
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/*
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* Copy and checksum to user
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*/
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#define HAVE_CSUM_COPY_USER
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extern __wsum csum_and_copy_to_user(const void *src, void *dst, int len,
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__wsum sum, int *err_ptr);
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#endif /* _ASM_CHECKSUM_H */
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