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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* $Id: checksum.h,v 1.33 2002/02/01 22:01:05 davem Exp $ */
2#ifndef __SPARC_CHECKSUM_H
3#define __SPARC_CHECKSUM_H
4
5/* checksum.h: IP/UDP/TCP checksum routines on the Sparc.
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 */
Al Viro16ec7e12006-11-14 21:22:56 -080033extern __wsum csum_partial(const void *buff, int len, __wsum sum);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35/* the same as csum_partial, but copies from fs:src 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
42extern unsigned int __csum_partial_copy_sparc_generic (const unsigned char *, unsigned char *);
43
Al Viro16ec7e12006-11-14 21:22:56 -080044static inline __wsum
45csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046{
47 register unsigned int ret asm("o0") = (unsigned int)src;
48 register char *d asm("o1") = dst;
49 register int l asm("g1") = len;
50
51 __asm__ __volatile__ (
52 "call __csum_partial_copy_sparc_generic\n\t"
53 " mov %6, %%g7\n"
54 : "=&r" (ret), "=&r" (d), "=&r" (l)
55 : "0" (ret), "1" (d), "2" (l), "r" (sum)
56 : "o2", "o3", "o4", "o5", "o7",
57 "g2", "g3", "g4", "g5", "g7",
58 "memory", "cc");
Al Viro16ec7e12006-11-14 21:22:56 -080059 return (__force __wsum)ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060}
61
Al Viro16ec7e12006-11-14 21:22:56 -080062static inline __wsum
63csum_partial_copy_from_user(const void __user *src, void *dst, int len,
64 __wsum sum, int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 {
Al Viro16ec7e12006-11-14 21:22:56 -080066 register unsigned long ret asm("o0") = (unsigned long)src;
67 register char *d asm("o1") = dst;
68 register int l asm("g1") = len;
69 register __wsum s asm("g7") = sum;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Al Viro16ec7e12006-11-14 21:22:56 -080071 __asm__ __volatile__ (
72 ".section __ex_table,#alloc\n\t"
73 ".align 4\n\t"
74 ".word 1f,2\n\t"
75 ".previous\n"
76 "1:\n\t"
77 "call __csum_partial_copy_sparc_generic\n\t"
78 " st %8, [%%sp + 64]\n"
79 : "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s)
80 : "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err)
81 : "o2", "o3", "o4", "o5", "o7", "g2", "g3", "g4", "g5",
82 "cc", "memory");
83 return (__force __wsum)ret;
84}
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
Al Viro16ec7e12006-11-14 21:22:56 -080086static inline __wsum
87csum_partial_copy_to_user(const void *src, void __user *dst, int len,
88 __wsum sum, int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
90 if (!access_ok (VERIFY_WRITE, dst, len)) {
91 *err = -EFAULT;
92 return sum;
93 } else {
94 register unsigned long ret asm("o0") = (unsigned long)src;
95 register char __user *d asm("o1") = dst;
96 register int l asm("g1") = len;
Al Viro16ec7e12006-11-14 21:22:56 -080097 register __wsum s asm("g7") = sum;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99 __asm__ __volatile__ (
100 ".section __ex_table,#alloc\n\t"
101 ".align 4\n\t"
102 ".word 1f,1\n\t"
103 ".previous\n"
104 "1:\n\t"
105 "call __csum_partial_copy_sparc_generic\n\t"
106 " st %8, [%%sp + 64]\n"
107 : "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s)
108 : "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err)
109 : "o2", "o3", "o4", "o5", "o7",
110 "g2", "g3", "g4", "g5",
111 "cc", "memory");
Al Viro16ec7e12006-11-14 21:22:56 -0800112 return (__force __wsum)ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 }
114}
115
116#define HAVE_CSUM_COPY_USER
117#define csum_and_copy_to_user csum_partial_copy_to_user
118
119/* ihl is always 5 or greater, almost always is 5, and iph is word aligned
120 * the majority of the time.
121 */
Al Viro16ec7e12006-11-14 21:22:56 -0800122static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123{
Al Viro16ec7e12006-11-14 21:22:56 -0800124 __sum16 sum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 /* Note: We must read %2 before we touch %0 for the first time,
127 * because GCC can legitimately use the same register for
128 * both operands.
129 */
130 __asm__ __volatile__("sub\t%2, 4, %%g4\n\t"
131 "ld\t[%1 + 0x00], %0\n\t"
132 "ld\t[%1 + 0x04], %%g2\n\t"
133 "ld\t[%1 + 0x08], %%g3\n\t"
134 "addcc\t%%g2, %0, %0\n\t"
135 "addxcc\t%%g3, %0, %0\n\t"
136 "ld\t[%1 + 0x0c], %%g2\n\t"
137 "ld\t[%1 + 0x10], %%g3\n\t"
138 "addxcc\t%%g2, %0, %0\n\t"
139 "addx\t%0, %%g0, %0\n"
140 "1:\taddcc\t%%g3, %0, %0\n\t"
141 "add\t%1, 4, %1\n\t"
142 "addxcc\t%0, %%g0, %0\n\t"
143 "subcc\t%%g4, 1, %%g4\n\t"
144 "be,a\t2f\n\t"
145 "sll\t%0, 16, %%g2\n\t"
146 "b\t1b\n\t"
147 "ld\t[%1 + 0x10], %%g3\n"
148 "2:\taddcc\t%0, %%g2, %%g2\n\t"
149 "srl\t%%g2, 16, %0\n\t"
150 "addx\t%0, %%g0, %0\n\t"
151 "xnor\t%%g0, %0, %0"
152 : "=r" (sum), "=&r" (iph)
153 : "r" (ihl), "1" (iph)
Bob Breuer51bcf092007-02-01 20:24:35 -0800154 : "g2", "g3", "g4", "cc", "memory");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 return sum;
156}
157
158/* Fold a partial checksum without adding pseudo headers. */
Al Viro16ec7e12006-11-14 21:22:56 -0800159static inline __sum16 csum_fold(__wsum sum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
161 unsigned int tmp;
162
163 __asm__ __volatile__("addcc\t%0, %1, %1\n\t"
164 "srl\t%1, 16, %1\n\t"
165 "addx\t%1, %%g0, %1\n\t"
166 "xnor\t%%g0, %1, %0"
167 : "=&r" (sum), "=r" (tmp)
Al Viro16ec7e12006-11-14 21:22:56 -0800168 : "0" (sum), "1" ((__force u32)sum<<16)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 : "cc");
Al Viro16ec7e12006-11-14 21:22:56 -0800170 return (__force __sum16)sum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171}
172
Al Viro16ec7e12006-11-14 21:22:56 -0800173static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
174 unsigned short len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 unsigned short proto,
Al Viro16ec7e12006-11-14 21:22:56 -0800176 __wsum sum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
178 __asm__ __volatile__("addcc\t%1, %0, %0\n\t"
179 "addxcc\t%2, %0, %0\n\t"
180 "addxcc\t%3, %0, %0\n\t"
181 "addx\t%0, %%g0, %0\n\t"
182 : "=r" (sum), "=r" (saddr)
Al Viro16ec7e12006-11-14 21:22:56 -0800183 : "r" (daddr), "r" (proto + len), "0" (sum),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 "1" (saddr)
185 : "cc");
186 return sum;
187}
188
189/*
190 * computes the checksum of the TCP/UDP pseudo-header
191 * returns a 16-bit checksum, already complemented
192 */
Al Viro16ec7e12006-11-14 21:22:56 -0800193static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 unsigned short len,
195 unsigned short proto,
Al Viro16ec7e12006-11-14 21:22:56 -0800196 __wsum sum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
198 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
199}
200
201#define _HAVE_ARCH_IPV6_CSUM
202
Al Viro16ec7e12006-11-14 21:22:56 -0800203static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
204 const struct in6_addr *daddr,
205 __u32 len, unsigned short proto,
206 __wsum sum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207{
208 __asm__ __volatile__ (
209 "addcc %3, %4, %%g4\n\t"
210 "addxcc %5, %%g4, %%g4\n\t"
211 "ld [%2 + 0x0c], %%g2\n\t"
212 "ld [%2 + 0x08], %%g3\n\t"
213 "addxcc %%g2, %%g4, %%g4\n\t"
214 "ld [%2 + 0x04], %%g2\n\t"
215 "addxcc %%g3, %%g4, %%g4\n\t"
216 "ld [%2 + 0x00], %%g3\n\t"
217 "addxcc %%g2, %%g4, %%g4\n\t"
218 "ld [%1 + 0x0c], %%g2\n\t"
219 "addxcc %%g3, %%g4, %%g4\n\t"
220 "ld [%1 + 0x08], %%g3\n\t"
221 "addxcc %%g2, %%g4, %%g4\n\t"
222 "ld [%1 + 0x04], %%g2\n\t"
223 "addxcc %%g3, %%g4, %%g4\n\t"
224 "ld [%1 + 0x00], %%g3\n\t"
225 "addxcc %%g2, %%g4, %%g4\n\t"
226 "addxcc %%g3, %%g4, %0\n\t"
227 "addx 0, %0, %0\n"
228 : "=&r" (sum)
229 : "r" (saddr), "r" (daddr),
230 "r"(htonl(len)), "r"(htonl(proto)), "r"(sum)
231 : "g2", "g3", "g4", "cc");
232
233 return csum_fold(sum);
234}
235
236/* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
Al Viro16ec7e12006-11-14 21:22:56 -0800237static inline __sum16 ip_compute_csum(const void *buff, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238{
239 return csum_fold(csum_partial(buff, len, 0));
240}
241
242#endif /* !(__SPARC_CHECKSUM_H) */