1#ifndef _ASM_POWERPC_CHECKSUM_H
2#define _ASM_POWERPC_CHECKSUM_H
3#ifdef __KERNEL__
4
5
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7
8
9
10
11
12#ifdef CONFIG_GENERIC_CSUM
13#include <asm-generic/checksum.h>
14#else
15#include <linux/bitops.h>
16#include <linux/in6.h>
17
18
19
20
21
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24
25
26
27extern __wsum csum_partial_copy_generic(const void *src, void *dst,
28 int len, __wsum sum,
29 int *src_err, int *dst_err);
30
31#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
32extern __wsum csum_and_copy_from_user(const void __user *src, void *dst,
33 int len, __wsum sum, int *err_ptr);
34#define HAVE_CSUM_COPY_USER
35extern __wsum csum_and_copy_to_user(const void *src, void __user *dst,
36 int len, __wsum sum, int *err_ptr);
37
38#define csum_partial_copy_nocheck(src, dst, len, sum) \
39 csum_partial_copy_generic((src), (dst), (len), (sum), NULL, NULL)
40
41
42
43
44
45
46static inline __sum16 csum_fold(__wsum sum)
47{
48 unsigned int tmp;
49
50
51 __asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum));
52
53
54
55 return (__force __sum16)(~((__force u32)sum + tmp) >> 16);
56}
57
58static inline u32 from64to32(u64 x)
59{
60 return (x + ror64(x, 32)) >> 32;
61}
62
63static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
64 __u8 proto, __wsum sum)
65{
66#ifdef __powerpc64__
67 u64 s = (__force u32)sum;
68
69 s += (__force u32)saddr;
70 s += (__force u32)daddr;
71#ifdef __BIG_ENDIAN__
72 s += proto + len;
73#else
74 s += (proto + len) << 8;
75#endif
76 return (__force __wsum) from64to32(s);
77#else
78 __asm__("\n\
79 addc %0,%0,%1 \n\
80 adde %0,%0,%2 \n\
81 adde %0,%0,%3 \n\
82 addze %0,%0 \n\
83 "
84 : "=r" (sum)
85 : "r" (daddr), "r"(saddr), "r"(proto + len), "0"(sum));
86 return sum;
87#endif
88}
89
90
91
92
93
94static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len,
95 __u8 proto, __wsum sum)
96{
97 return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
98}
99
100#define HAVE_ARCH_CSUM_ADD
101static inline __wsum csum_add(__wsum csum, __wsum addend)
102{
103#ifdef __powerpc64__
104 u64 res = (__force u64)csum;
105#endif
106 if (__builtin_constant_p(csum) && csum == 0)
107 return addend;
108 if (__builtin_constant_p(addend) && addend == 0)
109 return csum;
110
111#ifdef __powerpc64__
112 res += (__force u64)addend;
113 return (__force __wsum)((u32)res + (res >> 32));
114#else
115 asm("addc %0,%0,%1;"
116 "addze %0,%0;"
117 : "+r" (csum) : "r" (addend) : "xer");
118 return csum;
119#endif
120}
121
122
123
124
125
126
127static inline __wsum ip_fast_csum_nofold(const void *iph, unsigned int ihl)
128{
129 const u32 *ptr = (const u32 *)iph + 1;
130#ifdef __powerpc64__
131 unsigned int i;
132 u64 s = *(const u32 *)iph;
133
134 for (i = 0; i < ihl - 1; i++, ptr++)
135 s += *ptr;
136 return (__force __wsum)from64to32(s);
137#else
138 __wsum sum, tmp;
139
140 asm("mtctr %3;"
141 "addc %0,%4,%5;"
142 "1: lwzu %1, 4(%2);"
143 "adde %0,%0,%1;"
144 "bdnz 1b;"
145 "addze %0,%0;"
146 : "=r" (sum), "=r" (tmp), "+b" (ptr)
147 : "r" (ihl - 2), "r" (*(const u32 *)iph), "r" (*ptr)
148 : "ctr", "xer", "memory");
149
150 return sum;
151#endif
152}
153
154static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
155{
156 return csum_fold(ip_fast_csum_nofold(iph, ihl));
157}
158
159
160
161
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164
165
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168
169
170
171__wsum __csum_partial(const void *buff, int len, __wsum sum);
172
173static inline __wsum csum_partial(const void *buff, int len, __wsum sum)
174{
175 if (__builtin_constant_p(len) && len <= 16 && (len & 1) == 0) {
176 if (len == 2)
177 sum = csum_add(sum, (__force __wsum)*(const u16 *)buff);
178 if (len >= 4)
179 sum = csum_add(sum, (__force __wsum)*(const u32 *)buff);
180 if (len == 6)
181 sum = csum_add(sum, (__force __wsum)
182 *(const u16 *)(buff + 4));
183 if (len >= 8)
184 sum = csum_add(sum, (__force __wsum)
185 *(const u32 *)(buff + 4));
186 if (len == 10)
187 sum = csum_add(sum, (__force __wsum)
188 *(const u16 *)(buff + 8));
189 if (len >= 12)
190 sum = csum_add(sum, (__force __wsum)
191 *(const u32 *)(buff + 8));
192 if (len == 14)
193 sum = csum_add(sum, (__force __wsum)
194 *(const u16 *)(buff + 12));
195 if (len >= 16)
196 sum = csum_add(sum, (__force __wsum)
197 *(const u32 *)(buff + 12));
198 } else if (__builtin_constant_p(len) && (len & 3) == 0) {
199 sum = csum_add(sum, ip_fast_csum_nofold(buff, len >> 2));
200 } else {
201 sum = __csum_partial(buff, len, sum);
202 }
203 return sum;
204}
205
206
207
208
209
210static inline __sum16 ip_compute_csum(const void *buff, int len)
211{
212 return csum_fold(csum_partial(buff, len, 0));
213}
214
215#define _HAVE_ARCH_IPV6_CSUM
216__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
217 const struct in6_addr *daddr,
218 __u32 len, __u8 proto, __wsum sum);
219
220#endif
221#endif
222#endif
223