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1 | #ifndef ASM_X86__CHECKSUM_64_H |
2 | #define ASM_X86__CHECKSUM_64_H | |
1da177e4 | 3 | |
3d3c6e10 JP |
4 | /* |
5 | * Checksums for x86-64 | |
6 | * Copyright 2002 by Andi Kleen, SuSE Labs | |
99122a3f | 7 | * with some code from asm-x86/checksum.h |
3d3c6e10 | 8 | */ |
1da177e4 LT |
9 | |
10 | #include <linux/compiler.h> | |
11 | #include <asm/uaccess.h> | |
12 | #include <asm/byteorder.h> | |
13 | ||
3d3c6e10 | 14 | /** |
1da177e4 LT |
15 | * csum_fold - Fold and invert a 32bit checksum. |
16 | * sum: 32bit unfolded sum | |
3d3c6e10 | 17 | * |
1da177e4 LT |
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 | */ | |
a4f89fb7 | 22 | static inline __sum16 csum_fold(__wsum sum) |
1da177e4 | 23 | { |
3d3c6e10 JP |
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)); | |
a4f89fb7 | 29 | return (__force __sum16)(~(__force u32)sum >> 16); |
1da177e4 LT |
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 | |
3d3c6e10 | 44 | */ |
a4f89fb7 | 45 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
1da177e4 LT |
46 | { |
47 | unsigned int sum; | |
48 | ||
3d3c6e10 JP |
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:" | |
2c656491 | 66 | /* Since the input registers which are loaded with iph and ihl |
1da177e4 LT |
67 | are modified, we must also specify them as outputs, or gcc |
68 | will assume they contain their original values. */ | |
3d3c6e10 JP |
69 | : "=r" (sum), "=r" (iph), "=r" (ihl) |
70 | : "1" (iph), "2" (ihl) | |
71 | : "memory"); | |
a4f89fb7 | 72 | return (__force __sum16)sum; |
1da177e4 LT |
73 | } |
74 | ||
3d3c6e10 | 75 | /** |
1da177e4 LT |
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 | |
3d3c6e10 JP |
81 | * @sum: initial sum to be added in (32bit unfolded) |
82 | * | |
83 | * Returns the pseudo header checksum the input data. Result is | |
1da177e4 LT |
84 | * 32bit unfolded. |
85 | */ | |
a4f89fb7 AV |
86 | static inline __wsum |
87 | csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, | |
88 | unsigned short proto, __wsum sum) | |
1da177e4 LT |
89 | { |
90 | asm(" addl %1, %0\n" | |
91 | " adcl %2, %0\n" | |
92 | " adcl %3, %0\n" | |
93 | " adcl $0, %0\n" | |
3d3c6e10 | 94 | : "=r" (sum) |
a4f89fb7 AV |
95 | : "g" (daddr), "g" (saddr), |
96 | "g" ((len + proto)<<8), "0" (sum)); | |
3d3c6e10 | 97 | return sum; |
1da177e4 LT |
98 | } |
99 | ||
100 | ||
3d3c6e10 | 101 | /** |
1da177e4 LT |
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 | |
3d3c6e10 JP |
107 | * @sum: initial sum to be added in (32bit unfolded) |
108 | * | |
1da177e4 LT |
109 | * Returns the 16bit pseudo header checksum the input data already |
110 | * complemented and ready to be filled in. | |
111 | */ | |
3d3c6e10 JP |
112 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
113 | unsigned short len, | |
114 | unsigned short proto, __wsum sum) | |
1da177e4 | 115 | { |
3d3c6e10 | 116 | return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); |
1da177e4 LT |
117 | } |
118 | ||
3d3c6e10 | 119 | /** |
1da177e4 LT |
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. | |
3d3c6e10 | 128 | */ |
a4f89fb7 | 129 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
1da177e4 LT |
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 */ | |
a4f89fb7 | 136 | extern __wsum csum_partial_copy_generic(const void *src, const void *dst, |
3d3c6e10 JP |
137 | int len, __wsum sum, |
138 | int *src_err_ptr, int *dst_err_ptr); | |
1da177e4 LT |
139 | |
140 | ||
a4f89fb7 | 141 | extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
3d3c6e10 | 142 | int len, __wsum isum, int *errp); |
a4f89fb7 | 143 | extern __wsum csum_partial_copy_to_user(const void *src, void __user *dst, |
3d3c6e10 JP |
144 | int len, __wsum isum, int *errp); |
145 | extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, | |
146 | int len, __wsum sum); | |
1da177e4 LT |
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 | ||
3d3c6e10 | 152 | /** |
1da177e4 LT |
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 | */ | |
a4f89fb7 | 160 | extern __sum16 ip_compute_csum(const void *buff, int len); |
1da177e4 LT |
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 | * | |
3d3c6e10 | 170 | * Computes an IPv6 pseudo header checksum. This sum is added the checksum |
1da177e4 LT |
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 | |
a4f89fb7 AV |
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); | |
1da177e4 LT |
181 | |
182 | static inline unsigned add32_with_carry(unsigned a, unsigned b) | |
183 | { | |
184 | asm("addl %2,%0\n\t" | |
3d3c6e10 JP |
185 | "adcl $0,%0" |
186 | : "=r" (a) | |
1da177e4 LT |
187 | : "0" (a), "r" (b)); |
188 | return a; | |
189 | } | |
190 | ||
77ef50a5 | 191 | #endif /* ASM_X86__CHECKSUM_64_H */ |