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-rw-r--r--include/asm-sparc64/checksum.h173
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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 unsigned int csum_partial(const unsigned char * buff, int len, unsigned int 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 unsigned int csum_partial_copy_nocheck(const unsigned char *src,
42 unsigned char *dst,
43 int len, unsigned int sum);
44
45extern long __csum_partial_copy_from_user(const unsigned char __user *src,
46 unsigned char *dst, int len,
47 unsigned int sum);
48
49static inline unsigned int
50csum_partial_copy_from_user(const unsigned char __user *src,
51 unsigned char *dst, int len,
52 unsigned int sum, int *err)
53{
54 long ret = __csum_partial_copy_from_user(src, dst, len, sum);
55 if (ret < 0)
56 *err = -EFAULT;
57 return (unsigned int) ret;
58}
59
60/*
61 * Copy and checksum to user
62 */
63#define HAVE_CSUM_COPY_USER
64extern long __csum_partial_copy_to_user(const unsigned char *src,
65 unsigned char __user *dst, int len,
66 unsigned int sum);
67
68static inline unsigned int
69csum_and_copy_to_user(const unsigned char *src,
70 unsigned char __user *dst, int len,
71 unsigned int sum, int *err)
72{
73 long ret = __csum_partial_copy_to_user(src, dst, len, sum);
74 if (ret < 0)
75 *err = -EFAULT;
76 return (unsigned int) ret;
77}
78
79/* ihl is always 5 or greater, almost always is 5, and iph is word aligned
80 * the majority of the time.
81 */
82extern unsigned short ip_fast_csum(__const__ unsigned char *iph,
83 unsigned int ihl);
84
85/* Fold a partial checksum without adding pseudo headers. */
86static inline unsigned short csum_fold(unsigned int sum)
87{
88 unsigned int tmp;
89
90 __asm__ __volatile__(
91" addcc %0, %1, %1\n"
92" srl %1, 16, %1\n"
93" addc %1, %%g0, %1\n"
94" xnor %%g0, %1, %0\n"
95 : "=&r" (sum), "=r" (tmp)
96 : "0" (sum), "1" (sum<<16)
97 : "cc");
98 return (sum & 0xffff);
99}
100
101static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
102 unsigned long daddr,
103 unsigned int len,
104 unsigned short proto,
105 unsigned int sum)
106{
107 __asm__ __volatile__(
108" addcc %1, %0, %0\n"
109" addccc %2, %0, %0\n"
110" addccc %3, %0, %0\n"
111" addc %0, %%g0, %0\n"
112 : "=r" (sum), "=r" (saddr)
113 : "r" (daddr), "r" ((proto<<16)+len), "0" (sum), "1" (saddr)
114 : "cc");
115 return sum;
116}
117
118/*
119 * computes the checksum of the TCP/UDP pseudo-header
120 * returns a 16-bit checksum, already complemented
121 */
122static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
123 unsigned long daddr,
124 unsigned short len,
125 unsigned short proto,
126 unsigned int sum)
127{
128 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
129}
130
131#define _HAVE_ARCH_IPV6_CSUM
132
133static inline unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
134 struct in6_addr *daddr,
135 __u32 len,
136 unsigned short proto,
137 unsigned int sum)
138{
139 __asm__ __volatile__ (
140" addcc %3, %4, %%g7\n"
141" addccc %5, %%g7, %%g7\n"
142" lduw [%2 + 0x0c], %%g2\n"
143" lduw [%2 + 0x08], %%g3\n"
144" addccc %%g2, %%g7, %%g7\n"
145" lduw [%2 + 0x04], %%g2\n"
146" addccc %%g3, %%g7, %%g7\n"
147" lduw [%2 + 0x00], %%g3\n"
148" addccc %%g2, %%g7, %%g7\n"
149" lduw [%1 + 0x0c], %%g2\n"
150" addccc %%g3, %%g7, %%g7\n"
151" lduw [%1 + 0x08], %%g3\n"
152" addccc %%g2, %%g7, %%g7\n"
153" lduw [%1 + 0x04], %%g2\n"
154" addccc %%g3, %%g7, %%g7\n"
155" lduw [%1 + 0x00], %%g3\n"
156" addccc %%g2, %%g7, %%g7\n"
157" addccc %%g3, %%g7, %0\n"
158" addc 0, %0, %0\n"
159 : "=&r" (sum)
160 : "r" (saddr), "r" (daddr), "r"(htonl(len)),
161 "r"(htonl(proto)), "r"(sum)
162 : "g2", "g3", "g7", "cc");
163
164 return csum_fold(sum);
165}
166
167/* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
168static inline unsigned short ip_compute_csum(unsigned char * buff, int len)
169{
170 return csum_fold(csum_partial(buff, len, 0));
171}
172
173#endif /* !(__SPARC64_CHECKSUM_H) */
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