Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 1 | #ifndef _ASM_POWERPC_CHECKSUM_H |
| 2 | #define _ASM_POWERPC_CHECKSUM_H |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 3 | #ifdef __KERNEL__ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | |
| 5 | /* |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | /* |
| 13 | * This is a version of ip_compute_csum() optimized for IP headers, |
| 14 | * which always checksum on 4 octet boundaries. ihl is the number |
| 15 | * of 32-bit words and is always >= 5. |
| 16 | */ |
Anton Blanchard | 7a332b0 | 2013-09-23 12:04:51 +1000 | [diff] [blame^] | 17 | #ifdef CONFIG_GENERIC_CSUM |
| 18 | #include <asm-generic/checksum.h> |
| 19 | #else |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 20 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | /* |
| 23 | * computes the checksum of the TCP/UDP pseudo-header |
| 24 | * returns a 16-bit checksum, already complemented |
| 25 | */ |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 26 | extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | unsigned short len, |
| 28 | unsigned short proto, |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 29 | __wsum sum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | /* |
| 32 | * computes the checksum of a memory block at buff, length len, |
| 33 | * and adds in "sum" (32-bit) |
| 34 | * |
| 35 | * returns a 32-bit number suitable for feeding into itself |
| 36 | * or csum_tcpudp_magic |
| 37 | * |
| 38 | * this function must be called with even lengths, except |
| 39 | * for the last fragment, which may be odd |
| 40 | * |
| 41 | * it's best to have buff aligned on a 32-bit boundary |
| 42 | */ |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 43 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | /* |
Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 46 | * Computes the checksum of a memory block at src, length len, |
| 47 | * and adds in "sum" (32-bit), while copying the block to dst. |
| 48 | * If an access exception occurs on src or dst, it stores -EFAULT |
| 49 | * to *src_err or *dst_err respectively (if that pointer is not |
| 50 | * NULL), and, for an error on src, zeroes the rest of dst. |
| 51 | * |
| 52 | * Like csum_partial, this must be called with even lengths, |
| 53 | * except for the last fragment. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | */ |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 55 | extern __wsum csum_partial_copy_generic(const void *src, void *dst, |
| 56 | int len, __wsum sum, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | int *src_err, int *dst_err); |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 58 | |
| 59 | #ifdef __powerpc64__ |
| 60 | #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER |
| 61 | extern __wsum csum_and_copy_from_user(const void __user *src, void *dst, |
| 62 | int len, __wsum sum, int *err_ptr); |
Anton Blanchard | 8c77391 | 2010-08-02 20:11:36 +0000 | [diff] [blame] | 63 | #define HAVE_CSUM_COPY_USER |
| 64 | extern __wsum csum_and_copy_to_user(const void *src, void __user *dst, |
| 65 | int len, __wsum sum, int *err_ptr); |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 66 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | /* |
| 68 | * the same as csum_partial, but copies from src to dst while it |
| 69 | * checksums. |
| 70 | */ |
Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 71 | #define csum_partial_copy_from_user(src, dst, len, sum, errp) \ |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 72 | csum_partial_copy_generic((__force const void *)(src), (dst), (len), (sum), (errp), NULL) |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 73 | #endif |
Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 74 | |
| 75 | #define csum_partial_copy_nocheck(src, dst, len, sum) \ |
| 76 | csum_partial_copy_generic((src), (dst), (len), (sum), NULL, NULL) |
| 77 | |
| 78 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | /* |
| 80 | * turns a 32-bit partial checksum (e.g. from csum_partial) into a |
| 81 | * 1's complement 16-bit checksum. |
| 82 | */ |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 83 | static inline __sum16 csum_fold(__wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | { |
| 85 | unsigned int tmp; |
| 86 | |
| 87 | /* swap the two 16-bit halves of sum */ |
| 88 | __asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum)); |
| 89 | /* if there is a carry from adding the two 16-bit halves, |
| 90 | it will carry from the lower half into the upper half, |
| 91 | giving us the correct sum in the upper half. */ |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 92 | return (__force __sum16)(~((__force u32)sum + tmp) >> 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | /* |
| 96 | * this routine is used for miscellaneous IP-like checksums, mainly |
| 97 | * in icmp.c |
| 98 | */ |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 99 | static inline __sum16 ip_compute_csum(const void *buff, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
| 101 | return csum_fold(csum_partial(buff, len, 0)); |
| 102 | } |
| 103 | |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 104 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | unsigned short len, |
| 106 | unsigned short proto, |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 107 | __wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | { |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 109 | #ifdef __powerpc64__ |
| 110 | unsigned long s = (__force u32)sum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 112 | s += (__force u32)saddr; |
| 113 | s += (__force u32)daddr; |
| 114 | s += proto + len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | s += (s >> 32); |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 116 | return (__force __wsum) s; |
Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 117 | #else |
Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 118 | __asm__("\n\ |
| 119 | addc %0,%0,%1 \n\ |
| 120 | adde %0,%0,%2 \n\ |
| 121 | adde %0,%0,%3 \n\ |
| 122 | addze %0,%0 \n\ |
| 123 | " |
| 124 | : "=r" (sum) |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 125 | : "r" (daddr), "r"(saddr), "r"(proto + len), "0"(sum)); |
| 126 | return sum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | #endif |
Al Viro | 879178c | 2006-11-14 21:21:58 -0800 | [diff] [blame] | 128 | } |
Anton Blanchard | 7a332b0 | 2013-09-23 12:04:51 +1000 | [diff] [blame^] | 129 | |
| 130 | #endif |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 131 | #endif /* __KERNEL__ */ |
Kumar Gala | d95bbcb | 2005-10-20 11:44:46 -0500 | [diff] [blame] | 132 | #endif |