| Ley Foon Tan | eea9507 | 2014-11-06 15:20:00 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> |
| 3 | * Copyright (C) 2004 Microtronix Datacom Ltd. |
| 4 | * |
| 5 | * This file is subject to the terms and conditions of the GNU General Public |
| 6 | * License. See the file "COPYING" in the main directory of this archive |
| 7 | * for more details. |
| 8 | */ |
| 9 | |
| 10 | #ifndef _ASM_NIOS_CHECKSUM_H |
| 11 | #define _ASM_NIOS_CHECKSUM_H |
| 12 | |
| 13 | /* Take these from lib/checksum.c */ |
| 14 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
| 15 | extern __wsum csum_partial_copy(const void *src, void *dst, int len, |
| 16 | __wsum sum); |
| 17 | extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
| 18 | int len, __wsum sum, int *csum_err); |
| 19 | #define csum_partial_copy_nocheck(src, dst, len, sum) \ |
| 20 | csum_partial_copy((src), (dst), (len), (sum)) |
| 21 | |
| 22 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
| 23 | extern __sum16 ip_compute_csum(const void *buff, int len); |
| 24 | |
| 25 | /* |
| 26 | * Fold a partial checksum |
| 27 | */ |
| 28 | static inline __sum16 csum_fold(__wsum sum) |
| 29 | { |
| 30 | __asm__ __volatile__( |
| 31 | "add %0, %1, %0\n" |
| 32 | "cmpltu r8, %0, %1\n" |
| 33 | "srli %0, %0, 16\n" |
| 34 | "add %0, %0, r8\n" |
| 35 | "nor %0, %0, %0\n" |
| 36 | : "=r" (sum) |
| 37 | : "r" (sum << 16), "0" (sum) |
| 38 | : "r8"); |
| 39 | return (__force __sum16) sum; |
| 40 | } |
| 41 | |
| 42 | /* |
| 43 | * computes the checksum of the TCP/UDP pseudo-header |
| 44 | * returns a 16-bit checksum, already complemented |
| 45 | */ |
| 46 | #define csum_tcpudp_nofold csum_tcpudp_nofold |
| 47 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
| Alexander Duyck | 01cfbad | 2016-03-11 14:05:34 -0800 | [diff] [blame] | 48 | __u32 len, __u8 proto, |
| Ley Foon Tan | eea9507 | 2014-11-06 15:20:00 +0800 | [diff] [blame] | 49 | __wsum sum) |
| 50 | { |
| 51 | __asm__ __volatile__( |
| 52 | "add %0, %1, %0\n" |
| 53 | "cmpltu r8, %0, %1\n" |
| 54 | "add %0, %0, r8\n" /* add carry */ |
| 55 | "add %0, %2, %0\n" |
| 56 | "cmpltu r8, %0, %2\n" |
| 57 | "add %0, %0, r8\n" /* add carry */ |
| 58 | "add %0, %3, %0\n" |
| 59 | "cmpltu r8, %0, %3\n" |
| 60 | "add %0, %0, r8\n" /* add carry */ |
| 61 | : "=r" (sum), "=r" (saddr) |
| Alexander Duyck | 01cfbad | 2016-03-11 14:05:34 -0800 | [diff] [blame] | 62 | : "r" (daddr), "r" ((len + proto) << 8), |
| Ley Foon Tan | eea9507 | 2014-11-06 15:20:00 +0800 | [diff] [blame] | 63 | "0" (sum), |
| 64 | "1" (saddr) |
| 65 | : "r8"); |
| 66 | |
| 67 | return sum; |
| 68 | } |
| 69 | |
| 70 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
| Alexander Duyck | 01cfbad | 2016-03-11 14:05:34 -0800 | [diff] [blame] | 71 | __u32 len, __u8 proto, |
| 72 | __wsum sum) |
| Ley Foon Tan | eea9507 | 2014-11-06 15:20:00 +0800 | [diff] [blame] | 73 | { |
| 74 | return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); |
| 75 | } |
| 76 | |
| 77 | #endif /* _ASM_NIOS_CHECKSUM_H */ |