3532010bcf
* sanitize prototypes and annotate * kill cast-as-lvalue abuses in csum_partial() * usual ntohs-equals-shift for checksum purposes Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
30 lines
706 B
C
30 lines
706 B
C
#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.
|
|
*/
|
|
|
|
static inline __wsum
|
|
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
|
|
unsigned short proto, __wsum sum)
|
|
{
|
|
__wsum res;
|
|
__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)
|
|
: "0" (sum), "r" (daddr), "r" (saddr), "r" ((len + proto) << 8));
|
|
|
|
return res;
|
|
}
|
|
|
|
#endif
|