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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