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- #ifndef _ASM_CRIS_ARCH_CHECKSUM_H
- #define _ASM_CRIS_ARCH_CHECKSUM_H
- /*
- * Check values used in TCP/UDP headers.
- *
- * The gain of doing this in assembler instead of C, is that C doesn't
- * generate carry-additions for the 32-bit components of the
- * checksum. Which means it would be necessary to split all those into
- * 16-bit components and then add.
- */
- static inline __wsum
- csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
- unsigned short len, unsigned short proto, __wsum sum)
- {
- __wsum res;
- __asm__ __volatile__ ("add.d %2, %0\n\t"
- "addc %3, %0\n\t"
- "addc %4, %0\n\t"
- "addc 0, %0\n\t"
- : "=r" (res)
- : "0" (sum), "r" (daddr), "r" (saddr), \
- "r" ((len + proto) << 8));
- return res;
- }
- #endif /* _ASM_CRIS_ARCH_CHECKSUM_H */
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