113 строки
2.7 KiB
C
113 строки
2.7 KiB
C
/*
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* include/asm-v850/checksum.h -- Checksum ops
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*
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* Copyright (C) 2001,2005 NEC Corporation
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* Copyright (C) 2001,2005 Miles Bader <miles@gnu.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* Written by Miles Bader <miles@gnu.org>
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*/
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#ifndef __V850_CHECKSUM_H__
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#define __V850_CHECKSUM_H__
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/*
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* computes the checksum of a memory block at buff, length len,
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* and adds in "sum" (32-bit)
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*
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* returns a 32-bit number suitable for feeding into itself
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* or csum_tcpudp_magic
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*
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* this function must be called with even lengths, except
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* for the last fragment, which may be odd
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*
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* it's best to have buff aligned on a 32-bit boundary
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*/
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extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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/*
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* the same as csum_partial, but copies from src while it
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* checksums
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*
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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*/
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extern __wsum csum_partial_copy_nocheck(const void *src,
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void *dst, int len, __wsum sum);
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/*
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* the same as csum_partial_copy, but copies from user space.
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*
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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*/
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extern __wsum csum_partial_copy_from_user (const void *src,
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void *dst,
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int len, __wsum sum,
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int *csum_err);
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__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
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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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unsigned int result;
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/*
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%0 %1
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hsw %1, %0 H L L H
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add %1, %0 H L H+L+C H+L
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*/
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asm ("hsw %1, %0; add %1, %0" : "=&r" (result) : "r" (sum));
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return (__force __sum16)(~result >> 16);
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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 __wsum
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csum_tcpudp_nofold (__be32 saddr, __be32 daddr,
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unsigned short len,
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unsigned short proto, __wsum sum)
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{
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int __carry;
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__asm__ ("add %2, %0;"
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"setf c, %1;"
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"add %1, %0;"
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"add %3, %0;"
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"setf c, %1;"
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"add %1, %0;"
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"add %4, %0;"
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"setf c, %1;"
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"add %1, %0"
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: "=&r" (sum), "=&r" (__carry)
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: "r" (daddr), "r" (saddr),
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"r" ((len + proto) << 8),
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"0" (sum));
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return sum;
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}
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static inline __sum16
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csum_tcpudp_magic (__be32 saddr, __be32 daddr,
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unsigned short len,
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unsigned short proto, __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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/*
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* this routine is used for miscellaneous IP-like checksums, mainly
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* in icmp.c
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*/
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extern __sum16 ip_compute_csum(const void *buff, int len);
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#endif /* __V850_CHECKSUM_H__ */
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