#ifndef _M68K_CHECKSUM_H
#define _M68K_CHECKSUM_H
#include
/*
* 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
*/
unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
/*
* the same as csum_partial, but copies from src while it
* checksums
*
* here even more important to align src and dst on a 32-bit (or even
* better 64-bit) boundary
*/
extern unsigned int csum_partial_copy_from_user(const unsigned char *src,
unsigned char *dst,
int len, int sum,
int *csum_err);
extern unsigned int csum_partial_copy_nocheck(const unsigned char *src,
unsigned char *dst, int len,
int sum);
/*
* This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries.
*
*/
static inline unsigned short
ip_fast_csum(unsigned char *iph, unsigned int ihl)
{
unsigned int sum = 0;
unsigned long tmp;
__asm__ ("subqw #1,%2\n"
"1:\t"
"movel %1@+,%3\n\t"
"addxl %3,%0\n\t"
"dbra %2,1b\n\t"
"movel %0,%3\n\t"
"swap %3\n\t"
"addxw %3,%0\n\t"
"clrw %3\n\t"
"addxw %3,%0\n\t"
: "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp)
: "0" (sum), "1" (iph), "2" (ihl)
: "memory");
return ~sum;
}
/*
* Fold a partial checksum
*/
static inline unsigned int csum_fold(unsigned int sum)
{
unsigned int tmp = sum;
__asm__("swap %1\n\t"
"addw %1, %0\n\t"
"clrw %1\n\t"
"addxw %1, %0"
: "=&d" (sum), "=&d" (tmp)
: "0" (sum), "1" (tmp));
return ~sum;
}
static inline unsigned int
csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
unsigned short proto, unsigned int sum)
{
__asm__ ("addl %2,%0\n\t"
"addxl %3,%0\n\t"
"addxl %4,%0\n\t"
"clrl %1\n\t"
"addxl %1,%0"
: "=&d" (sum), "=d" (saddr)
: "g" (daddr), "1" (saddr), "d" (len + proto),
"0" (sum));
return 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));
}
#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)
{
register unsigned long tmp;
__asm__("addl %2@,%0\n\t"
"movel %2@(4),%1\n\t"
"addxl %1,%0\n\t"
"movel %2@(8),%1\n\t"
"addxl %1,%0\n\t"
"movel %2@(12),%1\n\t"
"addxl %1,%0\n\t"
"movel %3@,%1\n\t"
"addxl %1,%0\n\t"
"movel %3@(4),%1\n\t"
"addxl %1,%0\n\t"
"movel %3@(8),%1\n\t"
"addxl %1,%0\n\t"
"movel %3@(12),%1\n\t"
"addxl %1,%0\n\t"
"addxl %4,%0\n\t"
"clrl %1\n\t"
"addxl %1,%0"
: "=&d" (sum), "=&d" (tmp)
: "a" (saddr), "a" (daddr), "d" (len + proto),
"0" (sum));
return csum_fold(sum);
}
#endif /* _M68K_CHECKSUM_H */