/* * 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. * 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. * * 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 * $Id$ */ #ifndef _MACHINE_IN_CKSUM_H_ #define _MACHINE_IN_CKSUM_H_ 1 #include /* * 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. */ /* * Optimized version for the i386 family */ #if (defined(__GNUC__) && defined(__i386__)) static __inline u_int in_cksum_hdr(const struct ip *ip) { register u_int sum = 0; #define ADD(n) \ __asm__ volatile ("addl " #n "(%2), %0" : "=r" (sum) : "0" (sum), "r" (ip)) #define ADDC(n) \ __asm__ volatile ("adcl " #n "(%2), %0" : "=r" (sum) : "0" (sum), "r" (ip)) #define MOP \ __asm__ volatile ("adcl $0, %0" : "=r" (sum) : "0" (sum)) ADD(0); ADDC(4); ADDC(8); ADDC(12); ADDC(16); MOP; 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)); } /* * Optimized version for the MC68xxx and Coldfire families */ #elif (defined(__GNUC__) && (defined(__mc68000__) || defined(__m68k__))) static __inline__ u_int in_cksum_hdr(const struct ip *ip) { register u_int *ap = (u_int *)ip; register u_int sum = *ap++; register u_int tmp; __asm__("addl %2@+,%0\n\t" "movel %2@+,%1\n\t" "addxl %1,%0\n\t" "movel %2@+,%1\n\t" "addxl %1,%0\n\t" "movel %2@,%1\n\t" "addxl %1,%0\n\t" "moveq #0,%1\n\t" "addxl %1,%0\n" : "=d" (sum), "=d" (tmp), "=a" (ap) : "0" (sum), "2" (ap)); sum = (sum & 0xffff) + (sum >> 16); if (sum > 0xffff) sum -= 0xffff; return ~sum & 0xffff; } /* * Optimized version for the PowerPC family */ #elif (defined(__GNUC__) && (defined(__PPC__) || defined(__ppc__))) static __inline u_int in_cksum_hdr(const struct ip *ip) { register u_int sum = 0; register u_int tmp; #define ADD(n) \ __asm__ volatile ("addc %0,%0,%2" : "=r" (sum) : "0" (sum), "r" (n)) #define ADDC(n) \ __asm__ volatile ("adde %0,%0,%2" : "=r" (sum) : "0" (sum), "r" (n)) #define MOP \ __asm__ volatile ("addic %0,%0,0" : "=r" (sum) : "0" (sum)) tmp = *(((u_int *) ip)); ADD(tmp); tmp = *(((u_int *) ip) + 1); ADDC(tmp); tmp = *(((u_int *) ip) + 2); ADDC(tmp); tmp = *(((u_int *) ip) + 3); ADDC(tmp); tmp = *(((u_int *) ip) + 4); ADDC(tmp); tmp = 0; ADDC(tmp); 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)); } /* * SPARC Version */ #elif (defined(__GNUC__) && defined(sparc)) static __inline u_int in_cksum_hdr(const struct ip *ip) { register u_int sum = 0; register u_int tmp_o2; register u_int tmp_o3; __asm__ volatile (" \ ld [%0], %1 ; \ ld [%0+4], %2 ; \ addcc %1, %2, %1 ; \ ld [%0+8], %2 ; \ addxcc %1, %2, %1 ; \ ld [%0+12], %2 ; \ addxcc %1, %2, %1 ; \ ld [%0+16], %2 ; \ addxcc %1, %2, %1 ; \ set 0x0ffff, %3 ; \ srl %1, 16, %2 ; \ and %1, %3, %1 ; \ addx %1, %2, %1 ; \ srl %1, 16, %1 ; \ add %1, %%g0, %1 ; \ neg %1 ; \ and %1, %3, %1 ; \ " : "=r" (ip), "=r" (sum), "=r" (tmp_o2), "=r" (tmp_o3) : "0" (ip), "1" (sum) ); return sum; } #define in_cksum_update(ip) \ do { \ int __tmpsum; \ __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ } while(0) /* * Here is the generic, portable, inefficient algorithm. */ #else u_int in_cksum_hdr __P((const struct ip *)); #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 #endif /* _MACHINE_IN_CKSUM_H_ */