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