| David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1 | /* MN10300 Optimised checksumming code |
| 2 | * |
| 3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public Licence |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the Licence, or (at your option) any later version. |
| 10 | */ |
| 11 | #ifndef _ASM_CHECKSUM_H |
| 12 | #define _ASM_CHECKSUM_H |
| 13 | |
| 14 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
| 15 | extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, |
| 16 | int len, __wsum sum); |
| 17 | extern __wsum csum_partial_copy_from_user(const void *src, void *dst, |
| 18 | int len, __wsum sum, |
| 19 | int *err_ptr); |
| 20 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
| 21 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
| 22 | extern __sum16 ip_compute_csum(const void *buff, int len); |
| 23 | |
| 24 | #define csum_partial_copy_fromuser csum_partial_copy |
| 25 | extern __wsum csum_partial_copy(const void *src, void *dst, int len, |
| 26 | __wsum sum); |
| 27 | |
| 28 | static inline __sum16 csum_fold(__wsum sum) |
| 29 | { |
| 30 | asm( |
| 31 | " add %1,%0 \n" |
| 32 | " addc 0xffff,%0 \n" |
| 33 | : "=r" (sum) |
| 34 | : "r" (sum << 16), "0" (sum & 0xffff0000) |
| 35 | : "cc" |
| 36 | ); |
| 37 | return (~sum) >> 16; |
| 38 | } |
| 39 | |
| 40 | static inline __wsum csum_tcpudp_nofold(unsigned long saddr, |
| 41 | unsigned long daddr, |
| 42 | unsigned short len, |
| 43 | unsigned short proto, |
| 44 | __wsum sum) |
| 45 | { |
| 46 | __wsum tmp; |
| 47 | |
| 48 | tmp = (__wsum) ntohs(len) << 16; |
| 49 | tmp += (__wsum) proto << 8; |
| 50 | |
| 51 | asm( |
| 52 | " add %1,%0 \n" |
| 53 | " addc %2,%0 \n" |
| 54 | " addc %3,%0 \n" |
| 55 | " addc 0,%0 \n" |
| 56 | : "=r" (sum) |
| 57 | : "r" (daddr), "r"(saddr), "r"(tmp), "0"(sum) |
| 58 | : "cc" |
| 59 | ); |
| 60 | return sum; |
| 61 | } |
| 62 | |
| 63 | /* |
| 64 | * computes the checksum of the TCP/UDP pseudo-header |
| 65 | * returns a 16-bit checksum, already complemented |
| 66 | */ |
| 67 | static inline __sum16 csum_tcpudp_magic(unsigned long saddr, |
| 68 | unsigned long daddr, |
| 69 | unsigned short len, |
| 70 | unsigned short proto, |
| 71 | __wsum sum) |
| 72 | { |
| 73 | return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); |
| 74 | } |
| 75 | |
| 76 | #undef _HAVE_ARCH_IPV6_CSUM |
| 77 | |
| 78 | /* |
| 79 | * Copy and checksum to user |
| 80 | */ |
| 81 | #define HAVE_CSUM_COPY_USER |
| 82 | extern __wsum csum_and_copy_to_user(const void *src, void *dst, int len, |
| 83 | __wsum sum, int *err_ptr); |
| 84 | |
| 85 | |
| 86 | #endif /* _ASM_CHECKSUM_H */ |