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- #ifndef _CRIS_ARCH_CHECKSUM_H
- #define _CRIS_ARCH_CHECKSUM_H
- /* Checksum some values used in TCP/UDP headers.
- *
- * The gain by doing this in asm is that C will not generate carry-additions
- * for the 32-bit components of the checksum, so otherwise we would have had
- * to split all of those into 16-bit components, then add.
- */
- static inline __wsum
- csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
- unsigned short proto, __wsum sum)
- {
- __wsum res;
- __asm__ ("add.d %2, %0\n\t"
- "ax\n\t"
- "add.d %3, %0\n\t"
- "ax\n\t"
- "add.d %4, %0\n\t"
- "ax\n\t"
- "addq 0, %0\n"
- : "=r" (res)
- : "0" (sum), "r" (daddr), "r" (saddr), "r" ((len + proto) << 8));
- return res;
- }
- #endif
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