-/* in_cksum.c 1.12 82/06/20 */
+/*
+ * 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 "../net/in.h"
-#include "../net/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
- * 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;
{
- 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 (;;) {
* we carefully use adwc.
*/
while ((mlen -= 32) >= 0) {
- asm("clrl r0"); /* clears carry */
#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) {
- asm("clrl r0");
+#ifdef unneeded /* The loop construct clears carry for us... */
+ asm("bicpsr $1"); /* clears carry */
+#endif
ADD; ADD;
asm("adwc $0,r8");
}
while ((mlen -= 2) >= 0) {
asm("movzwl (r9)+,r0; addl2 r0,r8");
}
- if (mlen == -1)
+ if (mlen == -1) {
sum += *(u_char *)w;
+ }
if (len == 0)
break;
/*
asm("mcoml r8,r8; movzwl r8,r8"); }
return (sum);
}
-#endif