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Linux/arch/cris/include/arch-v10/arch/checksum.h

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  1 #ifndef _CRIS_ARCH_CHECKSUM_H
  2 #define _CRIS_ARCH_CHECKSUM_H
  3 
  4 /* Checksum some values used in TCP/UDP headers.
  5  *
  6  * The gain by doing this in asm is that C will not generate carry-additions
  7  * for the 32-bit components of the checksum, so otherwise we would have had
  8  * to split all of those into 16-bit components, then add.
  9  */
 10 
 11 static inline __wsum
 12 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
 13                    __u8 proto, __wsum sum)
 14 {
 15         __wsum res;
 16         __asm__ ("add.d %2, %0\n\t"
 17                  "ax\n\t"
 18                  "add.d %3, %0\n\t"
 19                  "ax\n\t"
 20                  "add.d %4, %0\n\t"
 21                  "ax\n\t"
 22                  "addq 0, %0\n"
 23         : "=r" (res)
 24         : "" (sum), "r" (daddr), "r" (saddr), "r" ((len + proto) << 8));
 25 
 26         return res;
 27 }       
 28 
 29 #endif
 30 

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