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-rw-r--r--include/asm-sparc64/checksum.h168
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diff --git a/include/asm-sparc64/checksum.h b/include/asm-sparc64/checksum.h
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--- a/include/asm-sparc64/checksum.h
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1/* $Id: checksum.h,v 1.19 2002/02/09 19:49:31 davem Exp $ */
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 <asm/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 */
33extern __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 */
41extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
42 int len, __wsum sum);
43
44extern long __csum_partial_copy_from_user(const void __user *src,
45 void *dst, int len,
46 __wsum sum);
47
48static inline __wsum
49csum_partial_copy_from_user(const void __user *src,
50 void *dst, int len,
51 __wsum sum, int *err)
52{
53 long ret = __csum_partial_copy_from_user(src, dst, len, sum);
54 if (ret < 0)
55 *err = -EFAULT;
56 return (__force __wsum) ret;
57}
58
59/*
60 * Copy and checksum to user
61 */
62#define HAVE_CSUM_COPY_USER
63extern long __csum_partial_copy_to_user(const void *src,
64 void __user *dst, int len,
65 __wsum sum);
66
67static inline __wsum
68csum_and_copy_to_user(const void *src,
69 void __user *dst, int len,
70 __wsum sum, int *err)
71{
72 long ret = __csum_partial_copy_to_user(src, dst, len, sum);
73 if (ret < 0)
74 *err = -EFAULT;
75 return (__force __wsum) ret;
76}
77
78/* ihl is always 5 or greater, almost always is 5, and iph is word aligned
79 * the majority of the time.
80 */
81extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
82
83/* Fold a partial checksum without adding pseudo headers. */
84static inline __sum16 csum_fold(__wsum sum)
85{
86 unsigned int tmp;
87
88 __asm__ __volatile__(
89" addcc %0, %1, %1\n"
90" srl %1, 16, %1\n"
91" addc %1, %%g0, %1\n"
92" xnor %%g0, %1, %0\n"
93 : "=&r" (sum), "=r" (tmp)
94 : "0" (sum), "1" ((__force u32)sum<<16)
95 : "cc");
96 return (__force __sum16)sum;
97}
98
99static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
100 unsigned int len,
101 unsigned short proto,
102 __wsum sum)
103{
104 __asm__ __volatile__(
105" addcc %1, %0, %0\n"
106" addccc %2, %0, %0\n"
107" addccc %3, %0, %0\n"
108" addc %0, %%g0, %0\n"
109 : "=r" (sum), "=r" (saddr)
110 : "r" (daddr), "r" (proto + len), "0" (sum), "1" (saddr)
111 : "cc");
112 return sum;
113}
114
115/*
116 * computes the checksum of the TCP/UDP pseudo-header
117 * returns a 16-bit checksum, already complemented
118 */
119static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
120 unsigned short len,
121 unsigned short proto,
122 __wsum sum)
123{
124 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
125}
126
127#define _HAVE_ARCH_IPV6_CSUM
128
129static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
130 const struct in6_addr *daddr,
131 __u32 len, unsigned short proto,
132 __wsum sum)
133{
134 __asm__ __volatile__ (
135" addcc %3, %4, %%g7\n"
136" addccc %5, %%g7, %%g7\n"
137" lduw [%2 + 0x0c], %%g2\n"
138" lduw [%2 + 0x08], %%g3\n"
139" addccc %%g2, %%g7, %%g7\n"
140" lduw [%2 + 0x04], %%g2\n"
141" addccc %%g3, %%g7, %%g7\n"
142" lduw [%2 + 0x00], %%g3\n"
143" addccc %%g2, %%g7, %%g7\n"
144" lduw [%1 + 0x0c], %%g2\n"
145" addccc %%g3, %%g7, %%g7\n"
146" lduw [%1 + 0x08], %%g3\n"
147" addccc %%g2, %%g7, %%g7\n"
148" lduw [%1 + 0x04], %%g2\n"
149" addccc %%g3, %%g7, %%g7\n"
150" lduw [%1 + 0x00], %%g3\n"
151" addccc %%g2, %%g7, %%g7\n"
152" addccc %%g3, %%g7, %0\n"
153" addc 0, %0, %0\n"
154 : "=&r" (sum)
155 : "r" (saddr), "r" (daddr), "r"(htonl(len)),
156 "r"(htonl(proto)), "r"(sum)
157 : "g2", "g3", "g7", "cc");
158
159 return csum_fold(sum);
160}
161
162/* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
163static inline __sum16 ip_compute_csum(const void *buff, int len)
164{
165 return csum_fold(csum_partial(buff, len, 0));
166}
167
168#endif /* !(__SPARC64_CHECKSUM_H) */
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