diff options
Diffstat (limited to 'kernel/arch/blackfin/include/asm/checksum.h')
| -rw-r--r-- | kernel/arch/blackfin/include/asm/checksum.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/kernel/arch/blackfin/include/asm/checksum.h b/kernel/arch/blackfin/include/asm/checksum.h new file mode 100644 index 000000000..623cc7fb0 --- /dev/null +++ b/kernel/arch/blackfin/include/asm/checksum.h @@ -0,0 +1,44 @@ +/* + * 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 |