| /* | |
| * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> | |
| * Copyright (C) 2004 Microtronix Datacom Ltd. | |
| * | |
| * This file is subject to the terms and conditions of the GNU General Public | |
| * License. See the file "COPYING" in the main directory of this archive | |
| * for more details. | |
| */ | |
| #ifndef _ASM_NIOS_CHECKSUM_H | |
| #define _ASM_NIOS_CHECKSUM_H | |
| /* Take these from lib/checksum.c */ | |
| extern __wsum csum_partial(const void *buff, int len, __wsum sum); | |
| extern __wsum csum_partial_copy(const void *src, void *dst, int len, | |
| __wsum sum); | |
| extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, | |
| int len, __wsum sum, int *csum_err); | |
| #define csum_partial_copy_nocheck(src, dst, len, sum) \ | |
| csum_partial_copy((src), (dst), (len), (sum)) | |
| extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); | |
| extern __sum16 ip_compute_csum(const void *buff, int len); | |
| /* | |
| * Fold a partial checksum | |
| */ | |
| static inline __sum16 csum_fold(__wsum sum) | |
| { | |
| __asm__ __volatile__( | |
| "add %0, %1, %0\n" | |
| "cmpltu r8, %0, %1\n" | |
| "srli %0, %0, 16\n" | |
| "add %0, %0, r8\n" | |
| "nor %0, %0, %0\n" | |
| : "=r" (sum) | |
| : "r" (sum << 16), "0" (sum) | |
| : "r8"); | |
| return (__force __sum16) sum; | |
| } | |
| /* | |
| * computes the checksum of the TCP/UDP pseudo-header | |
| * returns a 16-bit checksum, already complemented | |
| */ | |
| #define csum_tcpudp_nofold csum_tcpudp_nofold | |
| static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, | |
| __u32 len, __u8 proto, | |
| __wsum sum) | |
| { | |
| __asm__ __volatile__( | |
| "add %0, %1, %0\n" | |
| "cmpltu r8, %0, %1\n" | |
| "add %0, %0, r8\n" /* add carry */ | |
| "add %0, %2, %0\n" | |
| "cmpltu r8, %0, %2\n" | |
| "add %0, %0, r8\n" /* add carry */ | |
| "add %0, %3, %0\n" | |
| "cmpltu r8, %0, %3\n" | |
| "add %0, %0, r8\n" /* add carry */ | |
| : "=r" (sum), "=r" (saddr) | |
| : "r" (daddr), "r" ((len + proto) << 8), | |
| "0" (sum), | |
| "1" (saddr) | |
| : "r8"); | |
| return sum; | |
| } | |
| static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, | |
| __u32 len, __u8 proto, | |
| __wsum sum) | |
| { | |
| return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); | |
| } | |
| #endif /* _ASM_NIOS_CHECKSUM_H */ |