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/arch/microblaze/include/asm/checksum.h

https://bitbucket.org/cresqo/cm7-p500-kernel
C Header | 34 lines | 17 code | 5 blank | 12 comment | 0 complexity | 2bbad156e2a444c333983837d107ca4b MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
 1/*
 2 * Copyright (C) 2008 Michal Simek <monstr@monstr.eu>
 3 * Copyright (C) 2006 Atmark Techno, Inc.
 4 *
 5 * This file is subject to the terms and conditions of the GNU General Public
 6 * License. See the file "COPYING" in the main directory of this archive
 7 * for more details.
 8 */
 9
10#ifndef _ASM_MICROBLAZE_CHECKSUM_H
11#define _ASM_MICROBLAZE_CHECKSUM_H
12
13/*
14 * computes the checksum of the TCP/UDP pseudo-header
15 * returns a 16-bit checksum, already complemented
16 */
17#define csum_tcpudp_nofold	csum_tcpudp_nofold
18static inline __wsum
19csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
20		   unsigned short proto, __wsum sum)
21{
22	__asm__("add %0, %0, %1\n\t"
23		"addc %0, %0, %2\n\t"
24		"addc %0, %0, %3\n\t"
25		"addc %0, %0, r0\n\t"
26		: "+&d" (sum)
27		: "d" (saddr), "d" (daddr), "d" (len + proto));
28
29	return sum;
30}
31
32#include <asm-generic/checksum.h>
33
34#endif /* _ASM_MICROBLAZE_CHECKSUM_H */