6192c1ea0a
The mmu and non-mmu versions of checksum.h are mostly the same, merge them. Signed-off-by: Greg Ungerer <gerg@uclinux.org>
171 lines
3.9 KiB
C
171 lines
3.9 KiB
C
#ifndef _M68K_CHECKSUM_H
|
|
#define _M68K_CHECKSUM_H
|
|
|
|
#include <linux/in6.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
|
|
*/
|
|
__wsum csum_partial(const void *buff, int len, __wsum 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 __wsum csum_partial_copy_from_user(const void __user *src,
|
|
void *dst,
|
|
int len, __wsum sum,
|
|
int *csum_err);
|
|
|
|
extern __wsum csum_partial_copy_nocheck(const void *src,
|
|
void *dst, int len,
|
|
__wsum sum);
|
|
|
|
|
|
#ifdef CONFIG_COLDFIRE
|
|
|
|
/*
|
|
* The ColdFire cores don't support all the 68k instructions used
|
|
* in the optimized checksum code below. So it reverts back to using
|
|
* more standard C coded checksums. The fast checksum code is
|
|
* significantly larger than the optimized version, so it is not
|
|
* inlined here.
|
|
*/
|
|
__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
|
|
|
|
static inline __sum16 csum_fold(__wsum sum)
|
|
{
|
|
unsigned int tmp = (__force u32)sum;
|
|
|
|
tmp = (tmp & 0xffff) + (tmp >> 16);
|
|
tmp = (tmp & 0xffff) + (tmp >> 16);
|
|
|
|
return (__force __sum16)~tmp;
|
|
}
|
|
|
|
#else
|
|
|
|
/*
|
|
* This is a version of ip_fast_csum() optimized for IP headers,
|
|
* which always checksum on 4 octet boundaries.
|
|
*/
|
|
static inline __sum16 ip_fast_csum(const void *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 (__force __sum16)~sum;
|
|
}
|
|
|
|
static inline __sum16 csum_fold(__wsum sum)
|
|
{
|
|
unsigned int tmp = (__force u32)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 (__force __sum16)~sum;
|
|
}
|
|
|
|
#endif /* CONFIG_COLDFIRE */
|
|
|
|
static inline __wsum
|
|
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
|
|
unsigned short proto, __wsum 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 __sum16
|
|
csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
|
|
unsigned short proto, __wsum 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 __sum16 ip_compute_csum(const void *buff, int len)
|
|
{
|
|
return csum_fold (csum_partial(buff, len, 0));
|
|
}
|
|
|
|
#define _HAVE_ARCH_IPV6_CSUM
|
|
static __inline__ __sum16
|
|
csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
|
|
__u32 len, unsigned short proto, __wsum 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 */
|