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1da177e4 LT |
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 | */ | |
85d20dee | 34 | asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum); |
1da177e4 LT |
35 | |
36 | /* | |
37 | * The same as csum_partial, but copies from src while it checksums. | |
38 | * | |
39 | * Here even more important to align src and dst on a 32-bit (or even | |
40 | * better 64-bit) boundary | |
41 | */ | |
85d20dee AV |
42 | extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, |
43 | int len, __wsum sum); | |
1da177e4 LT |
44 | |
45 | /* | |
46 | * This is a new version of the above that records errors it finds in *errp, | |
47 | * but continues and zeros thre rest of the buffer. | |
48 | */ | |
85d20dee AV |
49 | extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
50 | int len, __wsum sum, | |
1da177e4 LT |
51 | int *err_ptr); |
52 | ||
53 | /* | |
54 | * Fold a partial checksum | |
55 | */ | |
56 | ||
85d20dee | 57 | static inline __sum16 csum_fold(__wsum sum) |
1da177e4 LT |
58 | { |
59 | unsigned long tmpreg; | |
60 | __asm__( | |
61 | " sll3 %1, %0, #16 \n" | |
62 | " cmp %0, %0 \n" | |
63 | " addx %0, %1 \n" | |
64 | " ldi %1, #0 \n" | |
65 | " srli %0, #16 \n" | |
66 | " addx %0, %1 \n" | |
67 | " xor3 %0, %0, #0x0000ffff \n" | |
68 | : "=r" (sum), "=&r" (tmpreg) | |
69 | : "0" (sum) | |
70 | : "cbit" | |
71 | ); | |
85d20dee | 72 | return (__force __sum16)sum; |
1da177e4 LT |
73 | } |
74 | ||
75 | /* | |
76 | * This is a version of ip_compute_csum() optimized for IP headers, | |
77 | * which always checksum on 4 octet boundaries. | |
78 | */ | |
85d20dee AV |
79 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
80 | { | |
81 | unsigned long tmpreg0, tmpreg1; | |
82 | __wsum sum; | |
1da177e4 LT |
83 | |
84 | __asm__ __volatile__( | |
85 | " ld %0, @%1+ \n" | |
86 | " addi %2, #-4 \n" | |
87 | "# bgez %2, 2f \n" | |
88 | " cmp %0, %0 \n" | |
89 | " ld %3, @%1+ \n" | |
90 | " ld %4, @%1+ \n" | |
91 | " addx %0, %3 \n" | |
92 | " ld %3, @%1+ \n" | |
93 | " addx %0, %4 \n" | |
94 | " addx %0, %3 \n" | |
95 | " .fillinsn\n" | |
96 | "1: \n" | |
97 | " ld %4, @%1+ \n" | |
98 | " addi %2, #-1 \n" | |
99 | " addx %0, %4 \n" | |
100 | " bgtz %2, 1b \n" | |
101 | "\n" | |
102 | " ldi %3, #0 \n" | |
103 | " addx %0, %3 \n" | |
104 | " .fillinsn\n" | |
105 | "2: \n" | |
2c656491 | 106 | /* Since the input registers which are loaded with iph and ihl |
1da177e4 LT |
107 | are modified, we must also specify them as outputs, or gcc |
108 | will assume they contain their original values. */ | |
109 | : "=&r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmpreg0), "=&r" (tmpreg1) | |
110 | : "1" (iph), "2" (ihl) | |
111 | : "cbit", "memory"); | |
112 | ||
113 | return csum_fold(sum); | |
114 | } | |
115 | ||
85d20dee | 116 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
1da177e4 LT |
117 | unsigned short len, |
118 | unsigned short proto, | |
85d20dee | 119 | __wsum sum) |
1da177e4 LT |
120 | { |
121 | #if defined(__LITTLE_ENDIAN) | |
85d20dee | 122 | unsigned long len_proto = (proto + len) << 8; |
1da177e4 | 123 | #else |
85d20dee | 124 | unsigned long len_proto = proto + len; |
1da177e4 LT |
125 | #endif |
126 | unsigned long tmpreg; | |
127 | ||
128 | __asm__( | |
129 | " cmp %0, %0 \n" | |
130 | " addx %0, %2 \n" | |
131 | " addx %0, %3 \n" | |
132 | " addx %0, %4 \n" | |
133 | " ldi %1, #0 \n" | |
134 | " addx %0, %1 \n" | |
135 | : "=r" (sum), "=&r" (tmpreg) | |
136 | : "r" (daddr), "r" (saddr), "r" (len_proto), "0" (sum) | |
137 | : "cbit" | |
138 | ); | |
139 | ||
140 | return sum; | |
141 | } | |
142 | ||
143 | /* | |
144 | * computes the checksum of the TCP/UDP pseudo-header | |
145 | * returns a 16-bit checksum, already complemented | |
146 | */ | |
85d20dee | 147 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
1da177e4 LT |
148 | unsigned short len, |
149 | unsigned short proto, | |
85d20dee | 150 | __wsum sum) |
1da177e4 LT |
151 | { |
152 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
153 | } | |
154 | ||
155 | /* | |
156 | * this routine is used for miscellaneous IP-like checksums, mainly | |
157 | * in icmp.c | |
158 | */ | |
159 | ||
85d20dee AV |
160 | static inline __sum16 ip_compute_csum(const void *buff, int len) |
161 | { | |
1da177e4 LT |
162 | return csum_fold (csum_partial(buff, len, 0)); |
163 | } | |
164 | ||
165 | #define _HAVE_ARCH_IPV6_CSUM | |
85d20dee AV |
166 | static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
167 | const struct in6_addr *daddr, | |
168 | __u32 len, unsigned short proto, | |
169 | __wsum sum) | |
1da177e4 LT |
170 | { |
171 | unsigned long tmpreg0, tmpreg1, tmpreg2, tmpreg3; | |
172 | __asm__( | |
173 | " ld %1, @(%5) \n" | |
174 | " ld %2, @(4,%5) \n" | |
175 | " ld %3, @(8,%5) \n" | |
176 | " ld %4, @(12,%5) \n" | |
177 | " add %0, %1 \n" | |
178 | " addx %0, %2 \n" | |
179 | " addx %0, %3 \n" | |
180 | " addx %0, %4 \n" | |
181 | " ld %1, @(%6) \n" | |
182 | " ld %2, @(4,%6) \n" | |
183 | " ld %3, @(8,%6) \n" | |
184 | " ld %4, @(12,%6) \n" | |
185 | " addx %0, %1 \n" | |
186 | " addx %0, %2 \n" | |
187 | " addx %0, %3 \n" | |
188 | " addx %0, %4 \n" | |
189 | " addx %0, %7 \n" | |
190 | " addx %0, %8 \n" | |
191 | " ldi %1, #0 \n" | |
192 | " addx %0, %1 \n" | |
193 | : "=&r" (sum), "=&r" (tmpreg0), "=&r" (tmpreg1), | |
194 | "=&r" (tmpreg2), "=&r" (tmpreg3) | |
195 | : "r" (saddr), "r" (daddr), | |
85d20dee | 196 | "r" (htonl(len)), "r" (htonl(proto)), "0" (sum) |
1da177e4 LT |
197 | : "cbit" |
198 | ); | |
199 | ||
200 | return csum_fold(sum); | |
201 | } | |
202 | ||
203 | #endif /* _ASM_M32R_CHECKSUM_H */ | |
204 | #endif /* __KERNEL__ */ |