[8cce445] | 1 | /* |
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[3f098aed] | 2 | * Copyright (c) 1990 The Regents of the University of California. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * 3. All advertising materials mentioning features or use of this software |
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| 14 | * must display the following acknowledgement: |
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| 15 | * This product includes software developed by the University of |
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| 16 | * California, Berkeley and its contributors. |
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| 17 | * 4. Neither the name of the University nor the names of its contributors |
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| 18 | * may be used to endorse or promote products derived from this software |
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| 19 | * without specific prior written permission. |
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| 20 | * |
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 31 | * SUCH DAMAGE. |
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| 32 | * |
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| 33 | * from tahoe: in_cksum.c 1.2 86/01/05 |
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| 34 | * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 |
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| 35 | * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp |
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| 36 | * $Id$ |
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| 37 | */ |
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| 38 | |
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| 39 | #ifndef _MACHINE_IN_CKSUM_H_ |
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| 40 | #define _MACHINE_IN_CKSUM_H_ 1 |
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| 41 | |
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| 42 | #include <sys/cdefs.h> |
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| 43 | |
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| 44 | /* |
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| 45 | * It it useful to have an Internet checksum routine which is inlineable |
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| 46 | * and optimized specifically for the task of computing IP header checksums |
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| 47 | * in the normal case (where there are no options and the header length is |
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| 48 | * therefore always exactly five 32-bit words. |
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| 49 | */ |
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[8cce445] | 50 | |
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| 51 | /* |
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| 52 | * Optimized version for the i386 family |
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| 53 | */ |
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| 54 | |
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[3f098aed] | 55 | #if (defined(__GNUC__) && defined(__i386__)) |
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[8cce445] | 56 | |
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[3f098aed] | 57 | static __inline u_int |
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| 58 | in_cksum_hdr(const struct ip *ip) |
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| 59 | { |
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| 60 | register u_int sum = 0; |
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| 61 | |
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[8cce445] | 62 | #define ADD(n) \ |
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| 63 | __asm__ volatile ("addl " #n "(%2), %0" : "=r" (sum) : "0" (sum), "r" (ip)) |
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| 64 | #define ADDC(n) \ |
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| 65 | __asm__ volatile ("adcl " #n "(%2), %0" : "=r" (sum) : "0" (sum), "r" (ip)) |
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| 66 | #define MOP \ |
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| 67 | __asm__ volatile ("adcl $0, %0" : "=r" (sum) : "0" (sum)) |
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[3f098aed] | 68 | |
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| 69 | ADD(0); |
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| 70 | ADDC(4); |
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| 71 | ADDC(8); |
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| 72 | ADDC(12); |
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| 73 | ADDC(16); |
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| 74 | MOP; |
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| 75 | sum = (sum & 0xffff) + (sum >> 16); |
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| 76 | if (sum > 0xffff) |
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| 77 | sum -= 0xffff; |
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| 78 | |
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| 79 | return ~sum & 0xffff; |
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| 80 | } |
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| 81 | |
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| 82 | static __inline void |
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| 83 | in_cksum_update(struct ip *ip) |
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| 84 | { |
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| 85 | int __tmpsum; |
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| 86 | __tmpsum = (int)ntohs(ip->ip_sum) + 256; |
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| 87 | ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); |
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| 88 | } |
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| 89 | |
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[8cce445] | 90 | /* |
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| 91 | * Optimized version for the MC68xxx and Coldfire families |
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| 92 | */ |
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| 93 | |
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[3f098aed] | 94 | #elif (defined(__GNUC__) && (defined(__mc68000__) || defined(__m68k__))) |
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| 95 | |
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| 96 | static __inline__ u_int |
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| 97 | in_cksum_hdr(const struct ip *ip) |
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| 98 | { |
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| 99 | register u_int *ap = (u_int *)ip; |
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| 100 | register u_int sum = *ap++; |
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| 101 | register u_int tmp; |
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| 102 | |
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| 103 | __asm__("addl %2@+,%0\n\t" |
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| 104 | "movel %2@+,%1\n\t" |
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| 105 | "addxl %1,%0\n\t" |
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| 106 | "movel %2@+,%1\n\t" |
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| 107 | "addxl %1,%0\n\t" |
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| 108 | "movel %2@,%1\n\t" |
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| 109 | "addxl %1,%0\n\t" |
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| 110 | "moveq #0,%1\n\t" |
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| 111 | "addxl %1,%0\n" : |
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| 112 | "=d" (sum), "=d" (tmp), "=a" (ap) : |
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| 113 | "0" (sum), "2" (ap)); |
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| 114 | sum = (sum & 0xffff) + (sum >> 16); |
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| 115 | if (sum > 0xffff) |
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| 116 | sum -= 0xffff; |
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| 117 | return ~sum & 0xffff; |
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| 118 | } |
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| 119 | |
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[8cce445] | 120 | /* |
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| 121 | * Optimized version for the PowerPC family |
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| 122 | */ |
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| 123 | |
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| 124 | #elif (defined(__GNUC__) && (defined(__PPC__) || defined(__ppc__))) |
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| 125 | |
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| 126 | static __inline u_int |
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| 127 | in_cksum_hdr(const struct ip *ip) |
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| 128 | { |
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| 129 | register u_int sum = 0; |
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| 130 | register u_int tmp; |
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| 131 | |
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| 132 | #define ADD(n) \ |
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| 133 | __asm__ volatile ("addc %0,%0,%2" : "=r" (sum) : "0" (sum), "r" (n)) |
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| 134 | #define ADDC(n) \ |
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| 135 | __asm__ volatile ("adde %0,%0,%2" : "=r" (sum) : "0" (sum), "r" (n)) |
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| 136 | #define MOP \ |
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| 137 | __asm__ volatile ("addic %0,%0,0" : "=r" (sum) : "0" (sum)) |
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| 138 | |
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| 139 | tmp = *(((u_int *) ip)); ADD(tmp); |
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| 140 | tmp = *(((u_int *) ip) + 1); ADDC(tmp); |
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| 141 | tmp = *(((u_int *) ip) + 2); ADDC(tmp); |
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| 142 | tmp = *(((u_int *) ip) + 3); ADDC(tmp); |
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| 143 | tmp = *(((u_int *) ip) + 4); ADDC(tmp); |
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| 144 | tmp = 0; ADDC(tmp); |
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| 145 | sum = (sum & 0xffff) + (sum >> 16); |
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| 146 | if (sum > 0xffff) |
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| 147 | sum -= 0xffff; |
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| 148 | |
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| 149 | return ~sum & 0xffff; |
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| 150 | } |
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| 151 | |
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| 152 | static __inline void |
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| 153 | in_cksum_update(struct ip *ip) |
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| 154 | { |
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| 155 | int __tmpsum; |
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| 156 | __tmpsum = (int)ntohs(ip->ip_sum) + 256; |
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| 157 | ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); |
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| 158 | } |
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| 159 | |
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[517660f1] | 160 | /* |
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| 161 | * SPARC Version |
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| 162 | */ |
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| 163 | |
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| 164 | #elif (defined(__GNUC__) && defined(sparc)) |
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| 165 | |
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| 166 | static __inline u_int |
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| 167 | in_cksum_hdr(const struct ip *ip) |
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| 168 | { |
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| 169 | register u_int sum = 0; |
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| 170 | register u_int tmp_o2; |
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| 171 | register u_int tmp_o3; |
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| 172 | |
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| 173 | __asm__ volatile (" |
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| 174 | ld [%0], %1 ; \ |
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| 175 | ld [%0+4], %2 ; \ |
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| 176 | addcc %1, %2, %1 ; \ |
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| 177 | ld [%0+8], %2 ; \ |
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| 178 | addxcc %1, %2, %1 ; \ |
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| 179 | ld [%0+12], %2 ; \ |
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| 180 | addxcc %1, %2, %1 ; \ |
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| 181 | ld [%0+16], %2 ; \ |
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| 182 | addxcc %1, %2, %1 ; \ |
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| 183 | set 0x0ffff, %3 ; \ |
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| 184 | srl %1, 16, %2 ; \ |
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| 185 | and %1, %3, %1 ; \ |
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| 186 | addx %1, %2, %1 ; \ |
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| 187 | srl %1, 16, %1 ; \ |
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| 188 | add %1, %%g0, %1 ; \ |
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| 189 | neg %1 ; \ |
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| 190 | and %1, %3, %1 ; \ |
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| 191 | " : "=r" (ip), "=r" (sum), "=r" (tmp_o2), "=r" (tmp_o3) |
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| 192 | : "0" (ip), "1" (sum) |
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| 193 | ); |
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| 194 | return sum; |
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| 195 | } |
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| 196 | |
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| 197 | #define in_cksum_update(ip) \ |
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| 198 | do { \ |
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| 199 | int __tmpsum; \ |
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| 200 | __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ |
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| 201 | ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ |
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| 202 | } while(0) |
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[8cce445] | 203 | /* |
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| 204 | * Here is the generic, portable, inefficient algorithm. |
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| 205 | */ |
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| 206 | |
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[3f098aed] | 207 | #else |
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| 208 | u_int in_cksum_hdr __P((const struct ip *)); |
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| 209 | #define in_cksum_update(ip) \ |
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| 210 | do { \ |
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| 211 | int __tmpsum; \ |
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| 212 | __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ |
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| 213 | ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ |
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| 214 | } while(0) |
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| 215 | |
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| 216 | #endif |
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| 217 | |
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| 218 | #endif /* _MACHINE_IN_CKSUM_H_ */ |
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