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/*

 * 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: in_cksum.h,v 1.2 2001-09-27 12:01:53 chris Exp $

 */

#ifndef _MACHINE_IN_CKSUM_H_

#define _MACHINE_IN_CKSUM_H_    1

#include <sys/cdefs.h>

/*

 * 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_ */