source: rtems/c/src/exec/libnetworking/machine/in_cksum.h @ 517660f1

4.104.114.84.95
Last change on this file since 517660f1 was 517660f1, checked in by Joel Sherrill <joel.sherrill@…>, on 04/01/99 at 16:36:22

Moved sparc specific version of in_cksum_hdr to an inline routine like
the reset of the CPU specific implementations after comment from
Eric Norum.

  • Property mode set to 100644
File size: 6.0 KB
Line 
1/*
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *      This product includes software developed by the University of
16 *      California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *      from tahoe:     in_cksum.c      1.2     86/01/05
34 *      from:           @(#)in_cksum.c  1.3 (Berkeley) 1/19/91
35 *      from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
36 *      $Id$
37 */
38
39#ifndef _MACHINE_IN_CKSUM_H_
40#define _MACHINE_IN_CKSUM_H_    1
41
42#include <sys/cdefs.h>
43
44/*
45 * It it useful to have an Internet checksum routine which is inlineable
46 * and optimized specifically for the task of computing IP header checksums
47 * in the normal case (where there are no options and the header length is
48 * therefore always exactly five 32-bit words.
49 */
50
51/*
52 *  Optimized version for the i386 family
53 */
54
55#if (defined(__GNUC__) && defined(__i386__))
56
57static __inline u_int
58in_cksum_hdr(const struct ip *ip)
59{
60        register u_int sum = 0;
61                   
62#define ADD(n)  \
63    __asm__ volatile ("addl " #n "(%2), %0" : "=r" (sum) : "0" (sum), "r" (ip))
64#define ADDC(n) \
65    __asm__ volatile ("adcl " #n "(%2), %0" : "=r" (sum) : "0" (sum), "r" (ip))
66#define MOP     \
67    __asm__ volatile ("adcl         $0, %0" : "=r" (sum) : "0" (sum))
68
69        ADD(0);
70        ADDC(4);
71        ADDC(8);
72        ADDC(12);
73        ADDC(16);
74        MOP;
75        sum = (sum & 0xffff) + (sum >> 16);
76        if (sum > 0xffff)
77                sum -= 0xffff;
78
79        return ~sum & 0xffff;
80}
81
82static __inline void
83in_cksum_update(struct ip *ip)
84{
85        int __tmpsum;
86        __tmpsum = (int)ntohs(ip->ip_sum) + 256;
87        ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));
88}
89
90/*
91 *  Optimized version for the MC68xxx and Coldfire families
92 */
93
94#elif (defined(__GNUC__) && (defined(__mc68000__) || defined(__m68k__)))
95
96static __inline__ u_int
97in_cksum_hdr(const struct ip *ip)
98{
99        register u_int *ap = (u_int *)ip;
100        register u_int sum = *ap++;
101        register u_int tmp;
102                   
103        __asm__("addl  %2@+,%0\n\t"
104                "movel %2@+,%1\n\t"
105                "addxl %1,%0\n\t"
106                "movel %2@+,%1\n\t"
107                "addxl %1,%0\n\t"
108                "movel %2@,%1\n\t"
109                "addxl %1,%0\n\t"
110                "moveq #0,%1\n\t"
111                "addxl %1,%0\n" :
112                "=d" (sum), "=d" (tmp), "=a" (ap) :
113                "0" (sum), "2" (ap));
114        sum = (sum & 0xffff) + (sum >> 16);
115        if (sum > 0xffff)
116                sum -= 0xffff;
117        return ~sum & 0xffff;
118}
119
120/*
121 *  Optimized version for the PowerPC family
122 */
123
124#elif (defined(__GNUC__) && (defined(__PPC__) || defined(__ppc__)))
125
126static __inline u_int
127in_cksum_hdr(const struct ip *ip)
128{
129        register u_int sum = 0;
130        register u_int tmp;
131
132#define ADD(n) \
133         __asm__ volatile ("addc  %0,%0,%2" : "=r" (sum) : "0" (sum), "r" (n))
134#define ADDC(n) \
135        __asm__ volatile ("adde  %0,%0,%2" : "=r" (sum) : "0" (sum), "r" (n))
136#define MOP     \
137        __asm__ volatile ("addic %0,%0,0"  : "=r" (sum) : "0" (sum))
138
139        tmp = *(((u_int *) ip));      ADD(tmp);
140        tmp = *(((u_int *) ip) + 1);  ADDC(tmp);
141        tmp = *(((u_int *) ip) + 2);  ADDC(tmp);
142        tmp = *(((u_int *) ip) + 3);  ADDC(tmp);
143        tmp = *(((u_int *) ip) + 4);  ADDC(tmp);
144        tmp = 0;                      ADDC(tmp);
145        sum = (sum & 0xffff) + (sum >> 16);
146        if (sum > 0xffff)
147                sum -= 0xffff;
148
149        return ~sum & 0xffff;
150}
151
152static __inline void
153in_cksum_update(struct ip *ip)
154{
155        int __tmpsum;
156        __tmpsum = (int)ntohs(ip->ip_sum) + 256;
157        ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));
158}
159
160/*
161 *  SPARC Version
162 */
163
164#elif (defined(__GNUC__) && defined(sparc))
165
166static __inline u_int
167in_cksum_hdr(const struct ip *ip)
168{
169   register u_int sum = 0;
170   register u_int tmp_o2;
171   register u_int tmp_o3;
172
173   __asm__ volatile ("
174     ld [%0], %1 ; \
175     ld [%0+4], %2 ; \
176     addcc %1, %2, %1 ; \
177     ld [%0+8], %2 ; \
178     addxcc %1, %2, %1 ; \
179     ld [%0+12], %2 ; \
180     addxcc %1, %2, %1 ; \
181     ld [%0+16], %2 ; \
182     addxcc %1, %2, %1 ; \
183     set 0x0ffff, %3 ; \
184     srl %1, 16, %2 ; \
185     and %1, %3, %1 ; \
186     addx %1, %2, %1 ; \
187     srl %1, 16, %1 ; \
188     add %1, %%g0, %1 ; \
189     neg %1 ; \
190     and %1, %3, %1 ; \
191    " : "=r" (ip), "=r" (sum), "=r" (tmp_o2), "=r" (tmp_o3)
192      : "0" (ip), "1" (sum)
193  );
194  return sum;
195}
196
197#define in_cksum_update(ip) \
198        do { \
199                int __tmpsum; \
200                __tmpsum = (int)ntohs(ip->ip_sum) + 256; \
201                ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \
202        } while(0)
203/*
204 *  Here is the generic, portable, inefficient algorithm.
205 */
206
207#else
208u_int in_cksum_hdr __P((const struct ip *));
209#define in_cksum_update(ip) \
210        do { \
211                int __tmpsum; \
212                __tmpsum = (int)ntohs(ip->ip_sum) + 256; \
213                ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \
214        } while(0)
215
216#endif
217
218#endif /* _MACHINE_IN_CKSUM_H_ */
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