Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * INET         An implementation of the TCP/IP protocol suite for the LINUX

 *              operating system.  INET is implemented using the  BSD Socket

 *              interface as the means of communication with the user level.

 *

 *              M32R specific IP/TCP/UDP checksumming routines

 *              (Some code taken from MIPS architecture)

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 1994, 1995  Waldorf Electronics GmbH

 * Copyright (C) 1998, 1999  Ralf Baechle

 * Copyright (C) 2001-2005  Hiroyuki Kondo, Hirokazu Takata

 *

 */

#include <linux/module.h>

#include <linux/types.h>

#include <linux/string.h>

#include <net/checksum.h>

#include <asm/byteorder.h>

#include <asm/uaccess.h>

/*

 * Copy while checksumming, otherwise like csum_partial

 */

__wsum

csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)

{

        sum = csum_partial(src, len, sum);

        memcpy(dst, src, len);

        return sum;

}

EXPORT_SYMBOL(csum_partial_copy_nocheck);

/*

 * Copy from userspace and compute checksum.  If we catch an exception

 * then zero the rest of the buffer.

 */

__wsum

csum_partial_copy_from_user (const void __user *src, void *dst,

                             int len, __wsum sum, int *err_ptr)

{

        int missing;

        missing = copy_from_user(dst, src, len);

        if (missing) {

                memset(dst + len - missing, 0, missing);

                *err_ptr = -EFAULT;

        }

        return csum_partial(dst, len-missing, sum);

}

EXPORT_SYMBOL(csum_partial_copy_from_user);

EXPORT_SYMBOL(csum_partial);