1. 根目录:
2. arch
3. hexagon
4. include
5. asm
6. checksum.h

/*
 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifndef _ASM_CHECKSUM_H
#define _ASM_CHECKSUM_H

#define do_csum	do_csum
unsigned int do_csum(const void *voidptr, int len);

/*
 * the same as csum_partial, but copies from src while it
 * checksums
 *
 * here even more important to align src and dst on a 32-bit (or even
 * better 64-bit) boundary
 */
#define csum_partial_copy_nocheck csum_partial_copy_nocheck
__wsum csum_partial_copy_nocheck(const void *src, void *dst,
					int len, __wsum sum);

/*
 * computes the checksum of the TCP/UDP pseudo-header
 * returns a 16-bit checksum, already complemented
 */
#define csum_tcpudp_nofold csum_tcpudp_nofold
__wsum csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
	unsigned short len, unsigned short proto, __wsum sum);

#define csum_tcpudp_magic csum_tcpudp_magic
__sum16 csum_tcpudp_magic(unsigned long saddr, unsigned long daddr,
	unsigned short len, unsigned short proto, __wsum sum);

#include <asm-generic/checksum.h>

#endif