diff options
author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2013-10-09 22:42:09 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2013-10-10 09:06:58 +0200 |
commit | bceabc95c1c85d793200446fa85f1ddc6313ea29 (patch) | |
tree | 973c8bd8deca9fd69913f2895cc91e0e6114d46c /freebsd/sys/arm/arm | |
parent | Add FreeBSD sources as a submodule (diff) | |
download | rtems-libbsd-bceabc95c1c85d793200446fa85f1ddc6313ea29.tar.bz2 |
Move files to match FreeBSD layout
Diffstat (limited to 'freebsd/sys/arm/arm')
-rw-r--r-- | freebsd/sys/arm/arm/in_cksum.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/freebsd/sys/arm/arm/in_cksum.c b/freebsd/sys/arm/arm/in_cksum.c new file mode 100644 index 00000000..db98915d --- /dev/null +++ b/freebsd/sys/arm/arm/in_cksum.c @@ -0,0 +1,154 @@ +#include <freebsd/machine/rtems-bsd-config.h> + +/* $NetBSD: in_cksum.c,v 1.7 1997/09/02 13:18:15 thorpej Exp $ */ + +/*- + * Copyright (c) 1988, 1992, 1993 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1996 + * Matt Thomas <matt@3am-software.com> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)in_cksum.c 8.1 (Berkeley) 6/10/93 + */ + +#include <freebsd/sys/cdefs.h> /* RCS ID & Copyright macro defns */ +__FBSDID("$FreeBSD$"); + +#include <freebsd/sys/param.h> +#include <freebsd/sys/mbuf.h> +#include <freebsd/sys/systm.h> +#include <freebsd/netinet/in_systm.h> +#include <freebsd/netinet/in.h> +#include <freebsd/netinet/ip.h> +#include <freebsd/machine/in_cksum.h> + +/* + * Checksum routine for Internet Protocol family headers + * (Portable Alpha version). + * + * This routine is very heavily used in the network + * code and should be modified for each CPU to be as fast as possible. + */ + +#define ADDCARRY(x) (x > 65535 ? x -= 65535 : x) +#define REDUCE32 \ + { \ + q_util.q = sum; \ + sum = q_util.s[0] + q_util.s[1] + q_util.s[2] + q_util.s[3]; \ + } +#define REDUCE16 \ + { \ + q_util.q = sum; \ + l_util.l = q_util.s[0] + q_util.s[1] + q_util.s[2] + q_util.s[3]; \ + sum = l_util.s[0] + l_util.s[1]; \ + ADDCARRY(sum); \ + } + +union l_util { + u_int16_t s[2]; + u_int32_t l; +}; +union q_util { + u_int16_t s[4]; + u_int32_t l[2]; + u_int64_t q; +}; + +u_short +in_addword(u_short a, u_short b) +{ + u_int64_t sum = a + b; + + ADDCARRY(sum); + return (sum); +} + +static +uint64_t _do_cksum(void *addr, int len) +{ + uint64_t sum; + union q_util q_util; + + sum = do_cksum(addr, len); + REDUCE32; + return (sum); +} + +u_short +in_cksum_skip(struct mbuf *m, int len, int skip) +{ + u_int64_t sum = 0; + int mlen = 0; + int clen = 0; + caddr_t addr; + union q_util q_util; + union l_util l_util; + + len -= skip; + for (; skip && m; m = m->m_next) { + if (m->m_len > skip) { + mlen = m->m_len - skip; + addr = mtod(m, caddr_t) + skip; + goto skip_start; + } else { + skip -= m->m_len; + } + } + + for (; m && len; m = m->m_next) { + if (m->m_len == 0) + continue; + mlen = m->m_len; + addr = mtod(m, caddr_t); +skip_start: + if (len < mlen) + mlen = len; + + if ((clen ^ (int) addr) & 1) + sum += _do_cksum(addr, mlen) << 8; + else + sum += _do_cksum(addr, mlen); + + clen += mlen; + len -= mlen; + } + REDUCE16; + return (~sum & 0xffff); +} + +u_int in_cksum_hdr(const struct ip *ip) +{ + u_int64_t sum = do_cksum(ip, sizeof(struct ip)); + union q_util q_util; + union l_util l_util; + REDUCE16; + return (~sum & 0xffff); +} |