projects / deliverable / linux.git / blame
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1 | #ifndef _BFIN_CHECKSUM_H |
| 2 | #define _BFIN_CHECKSUM_H | |
| 3 | ||
| 4 | /* | |
| 5 | * MODIFIED FOR BFIN April 30, 2001 akbar.hussain@lineo.com | |
| 6 | * | |
| 7 | * computes the checksum of a memory block at buff, length len, | |
| 8 | * and adds in "sum" (32-bit) | |
| 9 | * | |
| 10 | * returns a 32-bit number suitable for feeding into itself | |
| 11 | * or csum_tcpudp_magic | |
| 12 | * | |
| 13 | * this function must be called with even lengths, except | |
| 14 | * for the last fragment, which may be odd | |
| 15 | * | |
| 16 | * it's best to have buff aligned on a 32-bit boundary | |
| 17 | */ | |
| 45b3947c | 18 | __wsum csum_partial(const void *buff, int len, __wsum sum); |
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19 | |
| 20 | /* | |
| 21 | * the same as csum_partial, but copies from src while it | |
| 22 | * checksums | |
| 23 | * | |
| 24 | * here even more important to align src and dst on a 32-bit (or even | |
| 25 | * better 64-bit) boundary | |
| 26 | */ | |
| 27 | ||
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28 | __wsum csum_partial_copy(const void *src, void *dst, |
| 29 | int len, __wsum sum); | |
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30 | |
| 31 | /* | |
| 32 | * the same as csum_partial_copy, but copies from user space. | |
| 33 | * | |
| 34 | * here even more important to align src and dst on a 32-bit (or even | |
| 35 | * better 64-bit) boundary | |
| 36 | */ | |
| 37 | ||
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38 | extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
| 39 | int len, __wsum sum, int *csum_err); | |
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40 | |
| 41 | #define csum_partial_copy_nocheck(src, dst, len, sum) \ | |
| 42 | csum_partial_copy((src), (dst), (len), (sum)) | |
| 43 | ||
| 45b3947c | 44 | __sum16 ip_fast_csum(unsigned char *iph, unsigned int ihl); |
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45 | |
| 46 | /* | |
| 47 | * Fold a partial checksum | |
| 48 | */ | |
| 49 | ||
| 45b3947c | 50 | static inline __sum16 csum_fold(__wsum sum) |
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51 | { |
| 52 | while (sum >> 16) | |
| 53 | sum = (sum & 0xffff) + (sum >> 16); | |
| 54 | return ((~(sum << 16)) >> 16); | |
| 55 | } | |
| 56 | ||
| 57 | /* | |
| 58 | * computes the checksum of the TCP/UDP pseudo-header | |
| 59 | * returns a 16-bit checksum, already complemented | |
| 60 | */ | |
| 61 | ||
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62 | static inline __wsum |
| 63 | csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, | |
| 64 | unsigned short proto, __wsum sum) | |
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65 | { |
| 66 | ||
| 67 | __asm__ ("%0 = %0 + %1;\n\t" | |
| 68 | "CC = AC0;\n\t" | |
| 69 | "if !CC jump 4;\n\t" | |
| 70 | "%0 = %0 + %4;\n\t" | |
| 71 | "%0 = %0 + %2;\n\t" | |
| 72 | "CC = AC0;\n\t" | |
| 73 | "if !CC jump 4;\n\t" | |
| 74 | "%0 = %0 + %4;\n\t" | |
| 75 | "%0 = %0 + %3;\n\t" | |
| 76 | "CC = AC0;\n\t" | |
| 77 | "if !CC jump 4;\n\t" | |
| 78 | "%0 = %0 + %4;\n\t" | |
| 79 | "NOP;\n\t" | |
| 80 | : "=d" (sum) | |
| 81 | : "d" (daddr), "d" (saddr), "d" ((ntohs(len)<<16)+proto*256), "d" (1), "0"(sum)); | |
| 82 | ||
| 83 | return (sum); | |
| 84 | } | |
| 85 | ||
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86 | static inline __sum16 |
| 87 | csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, | |
| 88 | unsigned short proto, __wsum sum) | |
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89 | { |
| 90 | return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); | |
| 91 | } | |
| 92 | ||
| 93 | /* | |
| 94 | * this routine is used for miscellaneous IP-like checksums, mainly | |
| 95 | * in icmp.c | |
| 96 | */ | |
| 97 | ||
| 45b3947c | 98 | extern __sum16 ip_compute_csum(const void *buff, int len); |
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99 | |
| 100 | #endif /* _BFIN_CHECKSUM_H */ |