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 11static inline __wsum 12csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, 13 unsigned short 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 : "0" (sum), "r" (daddr), "r" (saddr), "r" ((len + proto) << 8)); 25 26 return res; 27} 28 29#endif 30