BSD 4_3_Net_2 release

[unix-history] / usr / src / sys / vax / vax / in_cksum.c

diff --git a/usr/src/sys/vax/vax/in_cksum.c b/usr/src/sys/vax/vax/in_cksum.c
index ffb6145..7462c4e 100644 (file)
--- a/usr/src/sys/vax/vax/in_cksum.c
+++ b/usr/src/sys/vax/vax/in_cksum.c
@@ -1,23 +1,54 @@
-/*     in_cksum.c      1.15    82/10/30        */
+/*
+ * Copyright (c) 1982, 1986 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.
+ *
+ *     @(#)in_cksum.c  7.6 (Berkeley) 12/16/90
+ */

 
 

-#include <sys/types.h>
-#include "../h/mbuf.h"
-#include "../netinet/in.h"
-#include "../netinet/in_systm.h"
+#include "sys/param.h"
+#include "sys/mbuf.h"

 
 /*
 
 /*

- * Checksum routine for Internet Protocol family headers.
+ * Checksum routine for Internet Protocol family headers (VAX Version).
+ *

  * This routine is very heavily used in the network
  * This routine is very heavily used in the network

- * code and should be rewritten for each CPU to be as fast as possible.
+ * code and should be modified for each CPU to be as fast as possible.

  */
 
  */
 

-#if vax

 in_cksum(m, len)
        register struct mbuf *m;
        register int len;
 {
 in_cksum(m, len)
        register struct mbuf *m;
        register int len;
 {

-       register u_short *w;            /* known to be r9 */
-       register int sum = 0;           /* known to be r8 */
+       register u_short *w;            /* on vax, known to be r9 */
+       register int sum = 0;           /* on vax, known to be r8 */

        register int mlen = 0;
 
        for (;;) {
        register int mlen = 0;
 
        for (;;) {


@@ -69,15 +100,19 @@ in_cksum(m, len)
                 * we carefully use adwc.
                 */
                while ((mlen -= 32) >= 0) {
                 * we carefully use adwc.
                 */
                while ((mlen -= 32) >= 0) {

-                       asm("clrl r0");         /* clears carry */

 #undef ADD
 #undef ADD

+#ifdef unneeded                 /* The loop construct clears carry for us... */
+                       asm("bicpsr $1");               /* clears carry */
+#endif

 #define ADD            asm("adwc (r9)+,r8;");
                        ADD; ADD; ADD; ADD; ADD; ADD; ADD; ADD;
                        asm("adwc $0,r8");
                }
                mlen += 32;
                while ((mlen -= 8) >= 0) {
 #define ADD            asm("adwc (r9)+,r8;");
                        ADD; ADD; ADD; ADD; ADD; ADD; ADD; ADD;
                        asm("adwc $0,r8");
                }
                mlen += 32;
                while ((mlen -= 8) >= 0) {

-                       asm("clrl r0");
+#ifdef unneeded                 /* The loop construct clears carry for us... */
+                       asm("bicpsr $1");               /* clears carry */
+#endif

                        ADD; ADD;
                        asm("adwc $0,r8");
                }
                        ADD; ADD;
                        asm("adwc $0,r8");
                }


@@ -93,8 +128,9 @@ in_cksum(m, len)
                while ((mlen -= 2) >= 0) {
                        asm("movzwl (r9)+,r0; addl2 r0,r8");
                }
                while ((mlen -= 2) >= 0) {
                        asm("movzwl (r9)+,r0; addl2 r0,r8");
                }

-               if (mlen == -1)
+               if (mlen == -1) {

                        sum += *(u_char *)w;
                        sum += *(u_char *)w;

+               }

                if (len == 0)
                        break;
                /*
                if (len == 0)
                        break;
                /*


@@ -124,4 +160,3 @@ done:
          asm("mcoml r8,r8; movzwl r8,r8"); }
        return (sum);
 }
          asm("mcoml r8,r8; movzwl r8,r8"); }
        return (sum);
 }

-#endif