2005-04-16 16:20:36 -06:00
|
|
|
#ifndef _CRIS_ARCH_CHECKSUM_H
|
|
|
|
#define _CRIS_ARCH_CHECKSUM_H
|
|
|
|
|
|
|
|
/* Checksum some values used in TCP/UDP headers.
|
|
|
|
*
|
|
|
|
* The gain by doing this in asm is that C will not generate carry-additions
|
|
|
|
* for the 32-bit components of the checksum, so otherwise we would have had
|
|
|
|
* to split all of those into 16-bit components, then add.
|
|
|
|
*/
|
|
|
|
|
2006-11-14 22:15:19 -07:00
|
|
|
static inline __wsum
|
|
|
|
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
|
|
|
|
unsigned short proto, __wsum sum)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2006-11-14 22:15:19 -07:00
|
|
|
__wsum res;
|
2005-04-16 16:20:36 -06:00
|
|
|
__asm__ ("add.d %2, %0\n\t"
|
|
|
|
"ax\n\t"
|
|
|
|
"add.d %3, %0\n\t"
|
|
|
|
"ax\n\t"
|
|
|
|
"add.d %4, %0\n\t"
|
|
|
|
"ax\n\t"
|
|
|
|
"addq 0, %0\n"
|
|
|
|
: "=r" (res)
|
2006-11-14 22:15:19 -07:00
|
|
|
: "0" (sum), "r" (daddr), "r" (saddr), "r" ((len + proto) << 8));
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|