| /*- |
| * Copyright (c) 1990 The Regents of the University of California. |
| * All rights reserved. |
| * |
| * 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. |
| * 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. |
| * |
| * from tahoe: in_cksum.c 1.2 86/01/05 |
| * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 |
| * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp |
| * $FreeBSD$ |
| */ |
| |
| #ifndef _BSD_MACHINE_IN_CKSUM_H_ |
| #define _BSD_MACHINE_IN_CKSUM_H_ 1 |
| |
| #ifndef _BSD_SYS_CDEFS_H_ |
| #error this file needs sys/cdefs.h as a prerequisite |
| #endif |
| |
| /* |
| * MP safe (alfred) |
| */ |
| |
| #include <sys/bsd_cdefs.h> |
| |
| #define in_cksum(m, len) in_cksum_skip(m, len, 0) |
| |
| /* |
| * It it useful to have an Internet checksum routine which is inlineable |
| * and optimized specifically for the task of computing IP header checksums |
| * in the normal case (where there are no options and the header length is |
| * therefore always exactly five 32-bit words. |
| */ |
| #if defined(__GNUCLIKE_ASM) && !defined(__INTEL_COMPILER) |
| static __inline u_int |
| in_cksum_hdr(const struct ip *ip) |
| { |
| u_int sum = 0; |
| |
| __asm( |
| "addl %1, %0\n" |
| "adcl %2, %0\n" |
| "adcl %3, %0\n" |
| "adcl %4, %0\n" |
| "adcl %5, %0\n" |
| "adcl $0, %0" |
| : "+r" (sum) |
| : "g" (((const u_int32_t *)ip)[0]), |
| "g" (((const u_int32_t *)ip)[1]), |
| "g" (((const u_int32_t *)ip)[2]), |
| "g" (((const u_int32_t *)ip)[3]), |
| "g" (((const u_int32_t *)ip)[4]) |
| : "cc" |
| ); |
| sum = (sum & 0xffff) + (sum >> 16); |
| if (sum > 0xffff) |
| sum -= 0xffff; |
| |
| return ~sum & 0xffff; |
| } |
| |
| static __inline void |
| in_cksum_update(struct ip *ip) |
| { |
| int __tmpsum; |
| __tmpsum = (int)ntohs(ip->ip_sum) + 256; |
| ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); |
| } |
| |
| static __inline u_short |
| in_addword(u_short sum, u_short b) |
| { |
| __asm( |
| "addw %1, %0\n" |
| "adcw $0, %0" |
| : "+r" (sum) |
| : "g" (b) |
| : "cc" |
| ); |
| return (sum); |
| } |
| |
| static __inline u_short |
| in_pseudo(u_int sum, u_int b, u_int c) |
| { |
| __asm( |
| "addl %1, %0\n" |
| "adcl %2, %0\n" |
| "adcl $0, %0" |
| : "+r" (sum) |
| : "g" (b), |
| "g" (c) |
| : "cc" |
| ); |
| sum = (sum & 0xffff) + (sum >> 16); |
| if (sum > 0xffff) |
| sum -= 0xffff; |
| return (sum); |
| } |
| |
| #else |
| #define in_cksum_update(ip) \ |
| do { \ |
| int __tmpsum; \ |
| __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ |
| ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ |
| } while(0) |
| |
| #endif |
| |
| #ifdef _FREEBSD_KERNEL |
| #if !defined(__GNUCLIKE_ASM) || defined(__INTEL_COMPILER) |
| u_int in_cksum_hdr(const struct ip *ip); |
| u_short in_addword(u_short sum, u_short b); |
| u_short in_pseudo(u_int sum, u_int b, u_int c); |
| #endif |
| u_short in_cksum_skip(struct mbuf *m, int len, int skip); |
| #endif /* _FREEBSD_KERNEL */ |
| |
| #endif /* _BSD_MACHINE_IN_CKSUM_H_ */ |
