Vegard Nossum | 77ef50a | 2008-06-18 17:08:48 +0200 | [diff] [blame] | 1 | #ifndef ASM_X86__CHECKSUM_64_H |
| 2 | #define ASM_X86__CHECKSUM_64_H |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 4 | /* |
| 5 | * Checksums for x86-64 |
| 6 | * Copyright 2002 by Andi Kleen, SuSE Labs |
Dave Jones | 99122a3 | 2008-01-30 13:30:28 +0100 | [diff] [blame] | 7 | * with some code from asm-x86/checksum.h |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 8 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | |
| 10 | #include <linux/compiler.h> |
| 11 | #include <asm/uaccess.h> |
| 12 | #include <asm/byteorder.h> |
| 13 | |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 14 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | * csum_fold - Fold and invert a 32bit checksum. |
| 16 | * sum: 32bit unfolded sum |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 17 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * Fold a 32bit running checksum to 16bit and invert it. This is usually |
| 19 | * the last step before putting a checksum into a packet. |
| 20 | * Make sure not to mix with 64bit checksums. |
| 21 | */ |
Al Viro | a4f89fb | 2006-11-14 21:20:08 -0800 | [diff] [blame] | 22 | static inline __sum16 csum_fold(__wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | { |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 24 | asm(" addl %1,%0\n" |
| 25 | " adcl $0xffff,%0" |
| 26 | : "=r" (sum) |
| 27 | : "r" ((__force u32)sum << 16), |
| 28 | "0" ((__force u32)sum & 0xffff0000)); |
Al Viro | a4f89fb | 2006-11-14 21:20:08 -0800 | [diff] [blame] | 29 | return (__force __sum16)(~(__force u32)sum >> 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | } |
| 31 | |
| 32 | /* |
| 33 | * This is a version of ip_compute_csum() optimized for IP headers, |
| 34 | * which always checksum on 4 octet boundaries. |
| 35 | * |
| 36 | * By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by |
| 37 | * Arnt Gulbrandsen. |
| 38 | */ |
| 39 | |
| 40 | /** |
| 41 | * ip_fast_csum - Compute the IPv4 header checksum efficiently. |
| 42 | * iph: ipv4 header |
| 43 | * ihl: length of header / 4 |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 44 | */ |
Al Viro | a4f89fb | 2006-11-14 21:20:08 -0800 | [diff] [blame] | 45 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | { |
| 47 | unsigned int sum; |
| 48 | |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 49 | asm(" movl (%1), %0\n" |
| 50 | " subl $4, %2\n" |
| 51 | " jbe 2f\n" |
| 52 | " addl 4(%1), %0\n" |
| 53 | " adcl 8(%1), %0\n" |
| 54 | " adcl 12(%1), %0\n" |
| 55 | "1: adcl 16(%1), %0\n" |
| 56 | " lea 4(%1), %1\n" |
| 57 | " decl %2\n" |
| 58 | " jne 1b\n" |
| 59 | " adcl $0, %0\n" |
| 60 | " movl %0, %2\n" |
| 61 | " shrl $16, %0\n" |
| 62 | " addw %w2, %w0\n" |
| 63 | " adcl $0, %0\n" |
| 64 | " notl %0\n" |
| 65 | "2:" |
Thomas Graf | 2c65649 | 2005-08-20 17:24:25 -0700 | [diff] [blame] | 66 | /* Since the input registers which are loaded with iph and ihl |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | are modified, we must also specify them as outputs, or gcc |
| 68 | will assume they contain their original values. */ |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 69 | : "=r" (sum), "=r" (iph), "=r" (ihl) |
| 70 | : "1" (iph), "2" (ihl) |
| 71 | : "memory"); |
Al Viro | a4f89fb | 2006-11-14 21:20:08 -0800 | [diff] [blame] | 72 | return (__force __sum16)sum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | } |
| 74 | |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 75 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | * csum_tcpup_nofold - Compute an IPv4 pseudo header checksum. |
| 77 | * @saddr: source address |
| 78 | * @daddr: destination address |
| 79 | * @len: length of packet |
| 80 | * @proto: ip protocol of packet |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 81 | * @sum: initial sum to be added in (32bit unfolded) |
| 82 | * |
| 83 | * Returns the pseudo header checksum the input data. Result is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | * 32bit unfolded. |
| 85 | */ |
Al Viro | a4f89fb | 2006-11-14 21:20:08 -0800 | [diff] [blame] | 86 | static inline __wsum |
| 87 | csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, |
| 88 | unsigned short proto, __wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
| 90 | asm(" addl %1, %0\n" |
| 91 | " adcl %2, %0\n" |
| 92 | " adcl %3, %0\n" |
| 93 | " adcl $0, %0\n" |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 94 | : "=r" (sum) |
Al Viro | a4f89fb | 2006-11-14 21:20:08 -0800 | [diff] [blame] | 95 | : "g" (daddr), "g" (saddr), |
| 96 | "g" ((len + proto)<<8), "0" (sum)); |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 97 | return sum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | } |
| 99 | |
| 100 | |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 101 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | * csum_tcpup_magic - Compute an IPv4 pseudo header checksum. |
| 103 | * @saddr: source address |
| 104 | * @daddr: destination address |
| 105 | * @len: length of packet |
| 106 | * @proto: ip protocol of packet |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 107 | * @sum: initial sum to be added in (32bit unfolded) |
| 108 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | * Returns the 16bit pseudo header checksum the input data already |
| 110 | * complemented and ready to be filled in. |
| 111 | */ |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 112 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
| 113 | unsigned short len, |
| 114 | unsigned short proto, __wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | { |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 116 | return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | } |
| 118 | |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 119 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | * csum_partial - Compute an internet checksum. |
| 121 | * @buff: buffer to be checksummed |
| 122 | * @len: length of buffer. |
| 123 | * @sum: initial sum to be added in (32bit unfolded) |
| 124 | * |
| 125 | * Returns the 32bit unfolded internet checksum of the buffer. |
| 126 | * Before filling it in it needs to be csum_fold()'ed. |
| 127 | * buff should be aligned to a 64bit boundary if possible. |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 128 | */ |
Al Viro | a4f89fb | 2006-11-14 21:20:08 -0800 | [diff] [blame] | 129 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER 1 |
| 132 | #define HAVE_CSUM_COPY_USER 1 |
| 133 | |
| 134 | |
| 135 | /* Do not call this directly. Use the wrappers below */ |
Al Viro | a4f89fb | 2006-11-14 21:20:08 -0800 | [diff] [blame] | 136 | extern __wsum csum_partial_copy_generic(const void *src, const void *dst, |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 137 | int len, __wsum sum, |
| 138 | int *src_err_ptr, int *dst_err_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
| 140 | |
Al Viro | a4f89fb | 2006-11-14 21:20:08 -0800 | [diff] [blame] | 141 | extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 142 | int len, __wsum isum, int *errp); |
Al Viro | a4f89fb | 2006-11-14 21:20:08 -0800 | [diff] [blame] | 143 | extern __wsum csum_partial_copy_to_user(const void *src, void __user *dst, |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 144 | int len, __wsum isum, int *errp); |
| 145 | extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, |
| 146 | int len, __wsum sum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
| 148 | /* Old names. To be removed. */ |
| 149 | #define csum_and_copy_to_user csum_partial_copy_to_user |
| 150 | #define csum_and_copy_from_user csum_partial_copy_from_user |
| 151 | |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 152 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | * ip_compute_csum - Compute an 16bit IP checksum. |
| 154 | * @buff: buffer address. |
| 155 | * @len: length of buffer. |
| 156 | * |
| 157 | * Returns the 16bit folded/inverted checksum of the passed buffer. |
| 158 | * Ready to fill in. |
| 159 | */ |
Al Viro | a4f89fb | 2006-11-14 21:20:08 -0800 | [diff] [blame] | 160 | extern __sum16 ip_compute_csum(const void *buff, int len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
| 162 | /** |
| 163 | * csum_ipv6_magic - Compute checksum of an IPv6 pseudo header. |
| 164 | * @saddr: source address |
| 165 | * @daddr: destination address |
| 166 | * @len: length of packet |
| 167 | * @proto: protocol of packet |
| 168 | * @sum: initial sum (32bit unfolded) to be added in |
| 169 | * |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 170 | * Computes an IPv6 pseudo header checksum. This sum is added the checksum |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | * into UDP/TCP packets and contains some link layer information. |
| 172 | * Returns the unfolded 32bit checksum. |
| 173 | */ |
| 174 | |
| 175 | struct in6_addr; |
| 176 | |
| 177 | #define _HAVE_ARCH_IPV6_CSUM 1 |
Al Viro | a4f89fb | 2006-11-14 21:20:08 -0800 | [diff] [blame] | 178 | extern __sum16 |
| 179 | csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, |
| 180 | __u32 len, unsigned short proto, __wsum sum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
| 182 | static inline unsigned add32_with_carry(unsigned a, unsigned b) |
| 183 | { |
| 184 | asm("addl %2,%0\n\t" |
Joe Perches | 3d3c6e1 | 2008-03-23 01:01:50 -0700 | [diff] [blame] | 185 | "adcl $0,%0" |
| 186 | : "=r" (a) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | : "0" (a), "r" (b)); |
| 188 | return a; |
| 189 | } |
| 190 | |
Vegard Nossum | 77ef50a | 2008-06-18 17:08:48 +0200 | [diff] [blame] | 191 | #endif /* ASM_X86__CHECKSUM_64_H */ |