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-rw-r--r--include/asm-m32r/checksum.h208
1 files changed, 208 insertions, 0 deletions
diff --git a/include/asm-m32r/checksum.h b/include/asm-m32r/checksum.h
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+++ b/include/asm-m32r/checksum.h
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1#ifdef __KERNEL__
2#ifndef _ASM_M32R_CHECKSUM_H
3#define _ASM_M32R_CHECKSUM_H
4
5/*
6 * include/asm-m32r/checksum.h
7 *
8 * IP/TCP/UDP checksum routines
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file "COPYING" in the main directory of this archive
12 * for more details.
13 *
14 * Some code taken from mips and parisc architecture.
15 *
16 * Copyright (C) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata
17 * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
18 */
19
20#include <linux/in6.h>
21
22/*
23 * computes the checksum of a memory block at buff, length len,
24 * and adds in "sum" (32-bit)
25 *
26 * returns a 32-bit number suitable for feeding into itself
27 * or csum_tcpudp_magic
28 *
29 * this function must be called with even lengths, except
30 * for the last fragment, which may be odd
31 *
32 * it's best to have buff aligned on a 32-bit boundary
33 */
34asmlinkage unsigned int csum_partial(const unsigned char *buff,
35 int len, unsigned int sum);
36
37/*
38 * The same as csum_partial, but copies from src while it checksums.
39 *
40 * Here even more important to align src and dst on a 32-bit (or even
41 * better 64-bit) boundary
42 */
43extern unsigned int csum_partial_copy_nocheck(const unsigned char *src,
44 unsigned char *dst,
45 int len, unsigned int sum);
46
47/*
48 * This is a new version of the above that records errors it finds in *errp,
49 * but continues and zeros thre rest of the buffer.
50 */
51extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src,
52 unsigned char *dst,
53 int len, unsigned int sum,
54 int *err_ptr);
55
56/*
57 * Fold a partial checksum
58 */
59
60static inline unsigned int csum_fold(unsigned int sum)
61{
62 unsigned long tmpreg;
63 __asm__(
64 " sll3 %1, %0, #16 \n"
65 " cmp %0, %0 \n"
66 " addx %0, %1 \n"
67 " ldi %1, #0 \n"
68 " srli %0, #16 \n"
69 " addx %0, %1 \n"
70 " xor3 %0, %0, #0x0000ffff \n"
71 : "=r" (sum), "=&r" (tmpreg)
72 : "0" (sum)
73 : "cbit"
74 );
75 return sum;
76}
77
78/*
79 * This is a version of ip_compute_csum() optimized for IP headers,
80 * which always checksum on 4 octet boundaries.
81 */
82static inline unsigned short ip_fast_csum(unsigned char * iph,
83 unsigned int ihl) {
84 unsigned long sum, tmpreg0, tmpreg1;
85
86 __asm__ __volatile__(
87 " ld %0, @%1+ \n"
88 " addi %2, #-4 \n"
89 "# bgez %2, 2f \n"
90 " cmp %0, %0 \n"
91 " ld %3, @%1+ \n"
92 " ld %4, @%1+ \n"
93 " addx %0, %3 \n"
94 " ld %3, @%1+ \n"
95 " addx %0, %4 \n"
96 " addx %0, %3 \n"
97 " .fillinsn\n"
98 "1: \n"
99 " ld %4, @%1+ \n"
100 " addi %2, #-1 \n"
101 " addx %0, %4 \n"
102 " bgtz %2, 1b \n"
103 "\n"
104 " ldi %3, #0 \n"
105 " addx %0, %3 \n"
106 " .fillinsn\n"
107 "2: \n"
108 /* Since the input registers which are loaded with iph and ipl
109 are modified, we must also specify them as outputs, or gcc
110 will assume they contain their original values. */
111 : "=&r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmpreg0), "=&r" (tmpreg1)
112 : "1" (iph), "2" (ihl)
113 : "cbit", "memory");
114
115 return csum_fold(sum);
116}
117
118static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
119 unsigned long daddr,
120 unsigned short len,
121 unsigned short proto,
122 unsigned int sum)
123{
124#if defined(__LITTLE_ENDIAN)
125 unsigned long len_proto = (ntohs(len)<<16)+proto*256;
126#else
127 unsigned long len_proto = (proto<<16)+len;
128#endif
129 unsigned long tmpreg;
130
131 __asm__(
132 " cmp %0, %0 \n"
133 " addx %0, %2 \n"
134 " addx %0, %3 \n"
135 " addx %0, %4 \n"
136 " ldi %1, #0 \n"
137 " addx %0, %1 \n"
138 : "=r" (sum), "=&r" (tmpreg)
139 : "r" (daddr), "r" (saddr), "r" (len_proto), "0" (sum)
140 : "cbit"
141 );
142
143 return sum;
144}
145
146/*
147 * computes the checksum of the TCP/UDP pseudo-header
148 * returns a 16-bit checksum, already complemented
149 */
150static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
151 unsigned long daddr,
152 unsigned short len,
153 unsigned short proto,
154 unsigned int sum)
155{
156 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
157}
158
159/*
160 * this routine is used for miscellaneous IP-like checksums, mainly
161 * in icmp.c
162 */
163
164static inline unsigned short ip_compute_csum(unsigned char * buff, int len) {
165 return csum_fold (csum_partial(buff, len, 0));
166}
167
168#define _HAVE_ARCH_IPV6_CSUM
169static inline unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
170 struct in6_addr *daddr,
171 __u16 len,
172 unsigned short proto,
173 unsigned int sum)
174{
175 unsigned long tmpreg0, tmpreg1, tmpreg2, tmpreg3;
176 __asm__(
177 " ld %1, @(%5) \n"
178 " ld %2, @(4,%5) \n"
179 " ld %3, @(8,%5) \n"
180 " ld %4, @(12,%5) \n"
181 " add %0, %1 \n"
182 " addx %0, %2 \n"
183 " addx %0, %3 \n"
184 " addx %0, %4 \n"
185 " ld %1, @(%6) \n"
186 " ld %2, @(4,%6) \n"
187 " ld %3, @(8,%6) \n"
188 " ld %4, @(12,%6) \n"
189 " addx %0, %1 \n"
190 " addx %0, %2 \n"
191 " addx %0, %3 \n"
192 " addx %0, %4 \n"
193 " addx %0, %7 \n"
194 " addx %0, %8 \n"
195 " ldi %1, #0 \n"
196 " addx %0, %1 \n"
197 : "=&r" (sum), "=&r" (tmpreg0), "=&r" (tmpreg1),
198 "=&r" (tmpreg2), "=&r" (tmpreg3)
199 : "r" (saddr), "r" (daddr),
200 "r" (htonl((__u32) (len))), "r" (htonl(proto)), "0" (sum)
201 : "cbit"
202 );
203
204 return csum_fold(sum);
205}
206
207#endif /* _ASM_M32R_CHECKSUM_H */
208#endif /* __KERNEL__ */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-23 14:37:57 -0500