| GuanXuetao | 96cf518 | 2011-01-15 18:23:09 +0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/unicore32/include/asm/checksum.h |
| 3 | * |
| 4 | * Code specific to PKUnity SoC and UniCore ISA |
| 5 | * |
| 6 | * Copyright (C) 2001-2010 GUAN Xue-tao |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | * IP checksum routines |
| 13 | */ |
| 14 | #ifndef __UNICORE_CHECKSUM_H__ |
| 15 | #define __UNICORE_CHECKSUM_H__ |
| 16 | |
| 17 | /* |
| 18 | * computes the checksum of the TCP/UDP pseudo-header |
| 19 | * returns a 16-bit checksum, already complemented |
| 20 | */ |
| 21 | |
| 22 | static inline __wsum |
| 23 | csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, |
| 24 | unsigned short proto, __wsum sum) |
| 25 | { |
| 26 | __asm__( |
| 27 | "add.a %0, %1, %2\n" |
| 28 | "addc.a %0, %0, %3\n" |
| 29 | "addc.a %0, %0, %4 << #8\n" |
| 30 | "addc.a %0, %0, %5\n" |
| 31 | "addc %0, %0, #0\n" |
| 32 | : "=&r"(sum) |
| 33 | : "r" (sum), "r" (daddr), "r" (saddr), "r" (len), "Ir" (htons(proto)) |
| 34 | : "cc"); |
| 35 | return sum; |
| 36 | } |
| 37 | #define csum_tcpudp_nofold csum_tcpudp_nofold |
| 38 | |
| 39 | #include <asm-generic/checksum.h> |
| 40 | |
| 41 | #endif |
