mirror of
https://github.com/torvalds/linux.git
synced 2024-11-06 20:21:57 +00:00
d9b5444eeb
"extern inline" doesn't make much sense. Signed-off-by: Adrian Bunk <bunk@stusta.de> Acked-by: Mikael Starvik <starvik@axis.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
30 lines
825 B
C
30 lines
825 B
C
#ifndef _ASM_CRIS_ARCH_CHECKSUM_H
|
|
#define _ASM_CRIS_ARCH_CHECKSUM_H
|
|
|
|
/*
|
|
* Check values used in TCP/UDP headers.
|
|
*
|
|
* The gain of doing this in assembler instead of C, is that C doesn't
|
|
* generate carry-additions for the 32-bit components of the
|
|
* checksum. Which means it would be necessary to split all those into
|
|
* 16-bit components and then add.
|
|
*/
|
|
static inline unsigned int
|
|
csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
|
|
unsigned short len, unsigned short proto, unsigned int sum)
|
|
{
|
|
int res;
|
|
|
|
__asm__ __volatile__ ("add.d %2, %0\n\t"
|
|
"addc %3, %0\n\t"
|
|
"addc %4, %0\n\t"
|
|
"addc 0, %0\n\t"
|
|
: "=r" (res)
|
|
: "0" (sum), "r" (daddr), "r" (saddr), \
|
|
"r" ((ntohs(len) << 16) + (proto << 8)));
|
|
|
|
return res;
|
|
}
|
|
|
|
#endif /* _ASM_CRIS_ARCH_CHECKSUM_H */
|