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Linux/arch/cris/include/arch-v32/arch/checksum.h

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  1 #ifndef _ASM_CRIS_ARCH_CHECKSUM_H
  2 #define _ASM_CRIS_ARCH_CHECKSUM_H
  3 
  4 /*
  5  * Check values used in TCP/UDP headers.
  6  *
  7  * The gain of doing this in assembler instead of C, is that C doesn't
  8  * generate carry-additions for the 32-bit components of the
  9  * checksum. Which means it would be necessary to split all those into
 10  * 16-bit components and then add.
 11  */
 12 static inline __wsum
 13 csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 14                    unsigned short len, unsigned short proto, __wsum sum)
 15 {
 16         __wsum res;
 17 
 18         __asm__ __volatile__ ("add.d %2, %0\n\t"
 19                               "addc %3, %0\n\t"
 20                               "addc %4, %0\n\t"
 21                               "addc 0, %0\n\t"
 22                               : "=r" (res)
 23                               : "" (sum), "r" (daddr), "r" (saddr), \
 24                               "r" ((len + proto) << 8));
 25 
 26         return res;
 27 }
 28 
 29 #endif /* _ASM_CRIS_ARCH_CHECKSUM_H */
 30 

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