1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __SPARC64_CHECKSUM_H
3 #define __SPARC64_CHECKSUM_H
4
5 /* checksum.h: IP/UDP/TCP checksum routines on the V9.
6 *
7 * Copyright(C) 1995 Linus Torvalds
8 * Copyright(C) 1995 Miguel de Icaza
9 * Copyright(C) 1996 David S. Miller
10 * Copyright(C) 1996 Eddie C. Dost
11 * Copyright(C) 1997 Jakub Jelinek
12 *
13 * derived from:
14 * Alpha checksum c-code
15 * ix86 inline assembly
16 * RFC1071 Computing the Internet Checksum
17 */
18
19 #include <linux/in6.h>
20 #include <linux/uaccess.h>
21
22 /* computes the checksum of a memory block at buff, length len,
23 * and adds in "sum" (32-bit)
24 *
25 * returns a 32-bit number suitable for feeding into itself
26 * or csum_tcpudp_magic
27 *
28 * this function must be called with even lengths, except
29 * for the last fragment, which may be odd
30 *
31 * it's best to have buff aligned on a 32-bit boundary
32 */
33 __wsum csum_partial(const void * buff, int len, __wsum sum);
34
35 /* the same as csum_partial, but copies from user space while it
36 * checksums
37 *
38 * here even more important to align src and dst on a 32-bit (or even
39 * better 64-bit) boundary
40 */
41 __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len);
42 __wsum csum_and_copy_from_user(const void __user *src, void *dst, int len);
43 __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len);
44
45 /* ihl is always 5 or greater, almost always is 5, and iph is word aligned
46 * the majority of the time.
47 */
48 __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
49
50 /* Fold a partial checksum without adding pseudo headers. */
51 static inline __sum16 csum_fold(__wsum sum)
52 {
53 unsigned int tmp;
54
55 __asm__ __volatile__(
56 " addcc %0, %1, %1\n"
57 " srl %1, 16, %1\n"
58 " addc %1, %%g0, %1\n"
59 " xnor %%g0, %1, %0\n"
60 : "=&r" (sum), "=r" (tmp)
61 : "" (sum), "1" ((__force u32)sum<<16)
62 : "cc");
63 return (__force __sum16)sum;
64 }
65
66 static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
67 __u32 len, __u8 proto,
68 __wsum sum)
69 {
70 __asm__ __volatile__(
71 " addcc %1, %0, %0\n"
72 " addccc %2, %0, %0\n"
73 " addccc %3, %0, %0\n"
74 " addc %0, %%g0, %0\n"
75 : "=r" (sum), "=r" (saddr)
76 : "r" (daddr), "r" (proto + len), "" (sum), "1" (saddr)
77 : "cc");
78 return sum;
79 }
80
81 /*
82 * computes the checksum of the TCP/UDP pseudo-header
83 * returns a 16-bit checksum, already complemented
84 */
85 static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
86 __u32 len, __u8 proto,
87 __wsum sum)
88 {
89 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
90 }
91
92 #define _HAVE_ARCH_IPV6_CSUM
93
94 static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
95 const struct in6_addr *daddr,
96 __u32 len, __u8 proto, __wsum sum)
97 {
98 __asm__ __volatile__ (
99 " addcc %3, %4, %%g7\n"
100 " addccc %5, %%g7, %%g7\n"
101 " lduw [%2 + 0x0c], %%g2\n"
102 " lduw [%2 + 0x08], %%g3\n"
103 " addccc %%g2, %%g7, %%g7\n"
104 " lduw [%2 + 0x04], %%g2\n"
105 " addccc %%g3, %%g7, %%g7\n"
106 " lduw [%2 + 0x00], %%g3\n"
107 " addccc %%g2, %%g7, %%g7\n"
108 " lduw [%1 + 0x0c], %%g2\n"
109 " addccc %%g3, %%g7, %%g7\n"
110 " lduw [%1 + 0x08], %%g3\n"
111 " addccc %%g2, %%g7, %%g7\n"
112 " lduw [%1 + 0x04], %%g2\n"
113 " addccc %%g3, %%g7, %%g7\n"
114 " lduw [%1 + 0x00], %%g3\n"
115 " addccc %%g2, %%g7, %%g7\n"
116 " addccc %%g3, %%g7, %0\n"
117 " addc 0, %0, %0\n"
118 : "=&r" (sum)
119 : "r" (saddr), "r" (daddr), "r"(htonl(len)),
120 "r"(htonl(proto)), "r"(sum)
121 : "g2", "g3", "g7", "cc");
122
123 return csum_fold(sum);
124 }
125
126 /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
127 static inline __sum16 ip_compute_csum(const void *buff, int len)
128 {
129 return csum_fold(csum_partial(buff, len, 0));
130 }
131
132 #define HAVE_ARCH_CSUM_ADD
133 static inline __wsum csum_add(__wsum csum, __wsum addend)
134 {
135 __asm__ __volatile__(
136 "addcc %0, %1, %0\n"
137 "addx %0, %%g0, %0"
138 : "=r" (csum)
139 : "r" (addend), "" (csum));
140
141 return csum;
142 }
143
144 #endif /* !(__SPARC64_CHECKSUM_H) */
145
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