linux/arch/blackfin/include/asm/checksum.h
Mike Frysinger ddf9ddacef Blackfin: convert to generic checksum code
The Blackfin port only implemented an optimized version of the
csum_tcpudp_nofold function, so convert everything else to the new
generic code.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-12-15 00:13:32 -05:00

44 lines
916 B
C

/*
* Copyright 2004-2009 Analog Devices Inc.
* akbar.hussain@lineo.com
*
* Licensed under the GPL-2 or later.
*/
#ifndef _BFIN_CHECKSUM_H
#define _BFIN_CHECKSUM_H
/*
* computes the checksum of the TCP/UDP pseudo-header
* returns a 16-bit checksum, already complemented
*/
static inline __wsum
__csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
unsigned short proto, __wsum sum)
{
unsigned int carry;
__asm__ ("%0 = %0 + %2;\n\t"
"CC = AC0;\n\t"
"%1 = CC;\n\t"
"%0 = %0 + %1;\n\t"
"%0 = %0 + %3;\n\t"
"CC = AC0;\n\t"
"%1 = CC;\n\t"
"%0 = %0 + %1;\n\t"
"%0 = %0 + %4;\n\t"
"CC = AC0;\n\t"
"%1 = CC;\n\t"
"%0 = %0 + %1;\n\t"
: "=d" (sum), "=&d" (carry)
: "d" (daddr), "d" (saddr), "d" ((len + proto) << 8), "0"(sum)
: "CC");
return (sum);
}
#define csum_tcpudp_nofold __csum_tcpudp_nofold
#include <asm-generic/checksum.h>
#endif