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#ifndef __ASM_SH64_CHECKSUM_H

#define __ASM_SH64_CHECKSUM_H

/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * include/asm-sh64/checksum.h

 *

 * Copyright (C) 2000, 2001  Paolo Alberelli

 *

 */

#include <asm/registers.h>

/*

 * computes the checksum of a memory block at buff, length len,

 * and adds in "sum" (32-bit)

 *

 * returns a 32-bit number suitable for feeding into itself

 * or csum_tcpudp_magic

 *

 * this function must be called with even lengths, except

 * for the last fragment, which may be odd

 *

 * it's best to have buff aligned on a 32-bit boundary

 */

asmlinkage unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);

//x

/*

 *      Note: when you get a NULL pointer exception here this means someone

 *      passed in an incorrect kernel address to one of these functions.

 *

 *      If you use these functions directly please don't forget the

 *      verify_area().

 */

#ifdef DJM_USE_ASM_CHECKSUM

/*

 * the same as csum_partial, but copies from src while it

 * checksums, and handles user-space pointer exceptions correctly, when needed.

 *

 * here even more important to align src and dst on a 32-bit (or even

 * better 64-bit) boundary

 */

asmlinkage unsigned int csum_partial_copy_generic( const char *src, char *dst, int len, int sum,

                                                   int *src_err_ptr, int *dst_err_ptr);

extern __inline__

unsigned int csum_partial_copy_nocheck ( const char *src, char *dst,

                                        int len, int sum)

{

        return csum_partial_copy_generic ( src, dst, len, sum, NULL, NULL);

}

#else

// Pre SIM:

//#define csum_partial_copy_nocheck csum_partial_copy

// Post SIM:

unsigned int

csum_partial_copy_nocheck(const char *src, char *dst, int len, unsigned int sum);

#endif

#ifdef DJM_USE_ASM_CHECKSUM

extern __inline__

unsigned int csum_partial_copy_from_user ( const char *src, char *dst,

                                                int len, unsigned int sum, int *err_ptr)

{

        return csum_partial_copy_generic ( src, dst, len, sum, err_ptr, NULL);

}

#else 

unsigned int csum_partial_copy_from_user ( const char *src, char *dst,

                                           int len, int sum, int *err_ptr);

//x

#endif

/*

 * These are the old (and unsafe) way of doing checksums, a warning message will be

 * printed if they are used and an exeption occurs.

 *

 * these functions should go away after some time.

 */

#define csum_partial_copy_fromuser csum_partial_copy

//x

unsigned int csum_partial_copy( const char *src, char *dst, int len, unsigned int sum);

//x

/*

 *      Fold a partial checksum

 */

#ifdef DJM_USE_ASM_CHECKSUM

static __inline__ unsigned int csum_fold(unsigned int sum)

{

        unsigned long long __dummy;

        __asm__("mshflo.w       r63, %0, %0\n\t"

                "mshflo.w       %0, r63, %1\n\t"

                "mshfhi.w       %0, r63, %0\n\t"

                "add            %0, %1, %0\n\t"

                "shlli          %0, 16, %1\n\t"

                "add            %0, %1, %0\n\t"

                "sub            r63, %0, %0\n\t"

                "shlri          %0, 48, %0"

                : "=r" (sum), "=&r" (__dummy)

                : "0" (sum));

        return sum;

}

#else

static inline unsigned short csum_fold(unsigned int sum)

//x

{

        sum = (sum & 0xffff) + (sum >> 16);

        sum = (sum & 0xffff) + (sum >> 16);

        return ~(sum);

}

#endif

#ifdef DJM_USE_ASM_CHECKSUM

/*

 *      This is a version of ip_compute_csum() optimized for IP headers,

 *      which always checksum on 4 octet boundaries.

 *

 *      i386 version by Jorge Cwik <jorge@laser.satlink.net>, adapted

 *      for linux by * Arnt Gulbrandsen.

 */

static __inline__ unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)

{

        unsigned long long sum, __dummy0, __dummy1;

        __asm__ __volatile__(

                "or     r63, r63, %0\n\t"       /* Clear upper part */

                "or     r63, r63, %3\n\t"       /* Clear upper part */

                "gettr  " __t0 ", %4\n\t"               /* t0 saving */

                /* Less waste using .UW than removing sign extension */

                "shlli  %2, 1, %2\n\t"          /* Longs -> Shorts */

                "addi   %2, -2, %2\n\t"         /* Last Short to start from */

                "ldx.uw %1, %2, %0\n\t"         /* Get last */

                "addi   %2, -2, %2\n\t"         /* Do it reverse */

                "_pta   4, " __t0 "\n\t"

                "ldx.uw %1, %2, %3\n\t"

                "add    %0, %3, %0\n\t"         /* Do the sum */

                "shlri  %0, 16, %3\n\t"

                "add    %0, %3, %0\n\t"         /* Fold it now */

                "shlli  %3, 16, %3\n\t"

                "sub    %0, %3, %0\n\t"         /* Remove carry, if any */

                "addi   %2, -2, %2\n\t"         /* Do it reverse */

                "bnei   %2, -2, " __t0 "\n\t"

                "shlli  %0, 48, %0\n\t"         /* Not sure this is required */

                "sub    r63, %0, %0\n\t"        /* Not */

                "shlri  %0, 48, %0\n\t"         /* Not sure this is required */

                "ptabs  %4, " __t0 "\n\t"

        : "=r" (sum), "=r" (iph), "=r" (ihl), "=r" (__dummy0), "=r" (__dummy1)

        : "1" (iph), "2" (ihl));

        return (unsigned short) sum;

}

#else

unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);

//x

#endif

#ifdef DJM_USE_ASM_CHECKSUM

static __inline__ unsigned long csum_tcpudp_nofold(unsigned long saddr,

                                                   unsigned long daddr,

                                                   unsigned short len,

                                                   unsigned short proto,

                                                   unsigned int sum)

{

#ifdef __LITTLE_ENDIAN__

        unsigned long len_proto = (ntohs(len)<<16)+proto*256;

#else

        unsigned long len_proto = (proto<<16)+len;

#endif

        __asm__("add    %0, %1, %0\n\t"

                "add    %0, %2, %0\n\t"

                "add    %0, %3, %0\n\t"

                "shlri  %0, 32, %1\n\t"

                "add    %0, %1, %0\n\t"         /* Fold it to a long */

                "shlli  %1, 32, %1\n\t"

                "sub    %0, %1, %0\n\t"         /* Remove carry, if any */

                : "=r" (sum), "=r" (len_proto)

                : "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum));

        return sum;

}

#else

unsigned long csum_tcpudp_nofold(unsigned long saddr,

                                                   unsigned long daddr,

                                                   unsigned short len,

                                                   unsigned short proto,

                                 unsigned int sum) ;

//x

#endif

/*

 * computes the checksum of the TCP/UDP pseudo-header

 * returns a 16-bit checksum, already complemented

 */

static __inline__ unsigned short int csum_tcpudp_magic(unsigned long saddr,

                                                       unsigned long daddr,

                                                       unsigned short len,

                                                       unsigned short proto,

                                                       unsigned int sum)

//x

{

  unsigned short int x;

  //printk("csum_tcpudp_magic saddr %08x daddr %08x len %04x proto %04x sum %08x\n",

  //     saddr,daddr,len,proto,sum);

  x = csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));

  //printk("csum_tcpudp_magic returning %04x\n", x);

  return x;

}

/*

 * this routine is used for miscellaneous IP-like checksums, mainly

 * in icmp.c

 */

static __inline__ unsigned short ip_compute_csum(unsigned char * buff, int len)

//x

{

    return csum_fold (csum_partial(buff, len, 0));

}

#ifdef DJM_USE_ASM_CHECKSUM

#define _HAVE_ARCH_IPV6_CSUM

static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,

                                                     struct in6_addr *daddr,

                                                     __u32 len,

                                                     unsigned short proto,

                                                     unsigned int sum)

{

        unsigned int __dummy;

        __asm__("ld.l   %2, 0, %1\n\t"

                "add    %0, %1, %0\n\t"

                "ld.l   %2, 4, %1\n\t"

                "add    %0, %1, %0\n\t"

                "ld.l   %2, 8, %1\n\t"

                "add    %0, %1, %0\n\t"

                "ld.l   %2, 12, %1\n\t"

                "add    %0, %1, %0\n\t"

                "ld.l   %3, 0, %1\n\t"

                "add    %0, %1, %0\n\t"

                "ld.l   %3, 4, %1\n\t"

                "add    %0, %1, %0\n\t"

                "ld.l   %3, 8, %1\n\t"

                "add    %0, %1, %0\n\t"

                "ld.l   %3, 12, %1\n\t"

                "add    %0, %1, %0\n\t"

                "add    %0, %4, %0\n\t"

                "add    %0, %5, %0\n\t"

                "shlri  %0, 32, %1\n\t"

                "add    %0, %1, %0\n\t"         /* Fold it to a long */

                "shlli  %1, 32, %1\n\t"

                "sub    %0, %1, %0\n\t"         /* Remove carry, if any */

                : "=r" (sum), "=&r" (__dummy)

                : "r" (saddr), "r" (daddr),

                  "r" (htonl(len)), "r" (htonl(proto)), "0" (sum));

        return csum_fold(sum);

}

#endif

#ifdef DJM_USE_ASM_CHECKSUM

/*

 *      Copy and checksum to user

 */

#define HAVE_CSUM_COPY_USER

static __inline__ unsigned int csum_and_copy_to_user (const char *src, char *dst,

                                    int len, int sum, int *err_ptr)

{

        if (access_ok(VERIFY_WRITE, dst, len))

                return csum_partial_copy_generic(src, dst, len, sum, NULL, err_ptr);

        if (len)

                *err_ptr = -EFAULT;

        return -1; /* invalid checksum */

}

#endif

#endif /* __ASM_SH64_CHECKSUM_H */