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Diffstat (limited to 'arch/blackfin/lib/checksum.c')
| -rw-r--r-- | arch/blackfin/lib/checksum.c | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/arch/blackfin/lib/checksum.c b/arch/blackfin/lib/checksum.c deleted file mode 100644 index cd605e7..0000000 --- a/arch/blackfin/lib/checksum.c +++ /dev/null @@ -1,145 +0,0 @@ -/* - * File: arch/blackfin/lib/checksum.c - * Based on: none - original work - * Author: - * - * Created: - * Description: 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. - * - * Modified: - * Copyright 2004-2006 Analog Devices Inc. - * - * Bugs: Enter bugs at http://blackfin.uclinux.org/ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * 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, see the file COPYING, or write - * to the Free Software Foundation, Inc., - * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include <linux/module.h> -#include <net/checksum.h> -#include <asm/checksum.h> - -#ifdef CONFIG_IP_CHECKSUM_L1 -static unsigned short do_csum(const unsigned char *buff, int len)__attribute__((l1_text)); -#endif - -static unsigned short do_csum(const unsigned char *buff, int len) -{ - register unsigned long sum = 0; - int swappem = 0; - - if (1 & (unsigned long)buff) { - sum = *buff << 8; - buff++; - len--; - ++swappem; - } - - while (len > 1) { - sum += *(unsigned short *)buff; - buff += 2; - len -= 2; - } - - if (len > 0) - sum += *buff; - - /* Fold 32-bit sum to 16 bits */ - while (sum >> 16) - sum = (sum & 0xffff) + (sum >> 16); - - if (swappem) - sum = ((sum & 0xff00) >> 8) + ((sum & 0x00ff) << 8); - - return sum; - -} - -/* - * This is a version of ip_compute_csum() optimized for IP headers, - * which always checksum on 4 octet boundaries. - */ -__sum16 ip_fast_csum(unsigned char *iph, unsigned int ihl) -{ - return (__force __sum16)~do_csum(iph, ihl * 4); -} -EXPORT_SYMBOL(ip_fast_csum); - -/* - * computes the checksum of a memory block at buff, length len, - * and adds in "sum" (32-bit) - * - * returns a 32-bit number suitable for feeding into itself - * or csum_tcpudp_magic - * - * this function must be called with even lengths, except - * for the last fragment, which may be odd - * - * it's best to have buff aligned on a 32-bit boundary - */ -__wsum csum_partial(const void *buff, int len, __wsum sum) -{ - /* - * Just in case we get nasty checksum data... - * Like 0xffff6ec3 in the case of our IPv6 multicast header. - * We fold to begin with, as well as at the end. - */ - sum = (sum & 0xffff) + (sum >> 16); - - sum += do_csum(buff, len); - - sum = (sum & 0xffff) + (sum >> 16); - - return sum; -} -EXPORT_SYMBOL(csum_partial); - -/* - * this routine is used for miscellaneous IP-like checksums, mainly - * in icmp.c - */ -__sum16 ip_compute_csum(const void *buff, int len) -{ - return (__force __sum16)~do_csum(buff, len); -} -EXPORT_SYMBOL(ip_compute_csum); - -/* - * copy from fs while checksumming, otherwise like csum_partial - */ - -__wsum -csum_partial_copy_from_user(const void __user *src, void *dst, - int len, __wsum sum, int *csum_err) -{ - if (csum_err) - *csum_err = 0; - memcpy(dst, (__force void *)src, len); - return csum_partial(dst, len, sum); -} -EXPORT_SYMBOL(csum_partial_copy_from_user); - -/* - * copy from ds while checksumming, otherwise like csum_partial - */ - -__wsum csum_partial_copy(const void *src, void *dst, int len, __wsum sum) -{ - memcpy(dst, src, len); - return csum_partial(dst, len, sum); -} -EXPORT_SYMBOL(csum_partial_copy); |
