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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);
/*
* 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().
*/
unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len,
unsigned int sum);
unsigned int csum_partial_copy_from_user(const char *src, char *dst,
int len, int sum, int *err_ptr);
/*
* 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
unsigned int csum_partial_copy(const char *src, char *dst, int len,
unsigned int sum);
static inline unsigned short csum_fold(unsigned int sum)
{
sum = (sum & 0xffff) + (sum >> 16);
sum = (sum & 0xffff) + (sum >> 16);
return ~(sum);
}
unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
unsigned long csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
unsigned short len, unsigned short proto,
unsigned int sum);
/*
* 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)
{
return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
}
/*
* 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)
{
return csum_fold(csum_partial(buff, len, 0));
}
#endif /* __ASM_SH64_CHECKSUM_H */
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