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TOMOYO Linux Cross Reference
Linux/arch/mn10300/include/asm/checksum.h

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  1 /* MN10300 Optimised checksumming code
  2  *
  3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public Licence
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the Licence, or (at your option) any later version.
 10  */
 11 #ifndef _ASM_CHECKSUM_H
 12 #define _ASM_CHECKSUM_H
 13 
 14 extern __wsum csum_partial(const void *buff, int len, __wsum sum);
 15 extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
 16                                         int len, __wsum sum);
 17 extern __wsum csum_partial_copy_from_user(const void *src, void *dst,
 18                                           int len, __wsum sum,
 19                                           int *err_ptr);
 20 extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
 21 extern __wsum csum_partial(const void *buff, int len, __wsum sum);
 22 extern __sum16 ip_compute_csum(const void *buff, int len);
 23 
 24 #define csum_partial_copy_fromuser csum_partial_copy
 25 extern __wsum csum_partial_copy(const void *src, void *dst, int len,
 26                                 __wsum sum);
 27 
 28 static inline __sum16 csum_fold(__wsum sum)
 29 {
 30         asm(
 31                 "       add     %1,%0           \n"
 32                 "       addc    0xffff,%0       \n"
 33                 : "=r" (sum)
 34                 : "r" (sum << 16), "" (sum & 0xffff0000)
 35                 : "cc"
 36             );
 37         return (~sum) >> 16;
 38 }
 39 
 40 static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 41                                         __u32 len, __u8 proto,
 42                                         __wsum sum)
 43 {
 44         __wsum tmp = (__wsum)((len + proto) << 8);
 45 
 46         asm(
 47                 "       add     %1,%0           \n"
 48                 "       addc    %2,%0           \n"
 49                 "       addc    %3,%0           \n"
 50                 "       addc    0,%0            \n"
 51                 : "=r" (sum)
 52                 : "r" (daddr), "r"(saddr), "r"(tmp), ""(sum)
 53                 : "cc"
 54             );
 55         return sum;
 56 }
 57 
 58 /*
 59  * computes the checksum of the TCP/UDP pseudo-header
 60  * returns a 16-bit checksum, already complemented
 61  */
 62 static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
 63                                         __u32 len, __u8 proto,
 64                                         __wsum sum)
 65 {
 66         return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
 67 }
 68 
 69 #undef _HAVE_ARCH_IPV6_CSUM
 70 
 71 /*
 72  *      Copy and checksum to user
 73  */
 74 #define HAVE_CSUM_COPY_USER
 75 extern __wsum csum_and_copy_to_user(const void *src, void *dst, int len,
 76                                     __wsum sum, int *err_ptr);
 77 
 78 
 79 #endif /* _ASM_CHECKSUM_H */
 80 

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