1
2#ifndef _ASM_POWERPC_CHECKSUM_H
3#define _ASM_POWERPC_CHECKSUM_H
4#ifdef __KERNEL__
5
6
7
8
9#include <linux/bitops.h>
10#include <linux/in6.h>
11
12
13
14
15
16
17
18
19
20
21extern __wsum csum_partial_copy_generic(const void *src, void *dst, int len);
22
23#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
24extern __wsum csum_and_copy_from_user(const void __user *src, void *dst,
25 int len);
26#define HAVE_CSUM_COPY_USER
27extern __wsum csum_and_copy_to_user(const void *src, void __user *dst,
28 int len);
29
30#define _HAVE_ARCH_CSUM_AND_COPY
31#define csum_partial_copy_nocheck(src, dst, len) \
32 csum_partial_copy_generic((src), (dst), (len))
33
34
35
36
37
38
39static inline __sum16 csum_fold(__wsum sum)
40{
41 unsigned int tmp;
42
43
44 __asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum));
45
46
47
48 return (__force __sum16)(~((__force u32)sum + tmp) >> 16);
49}
50
51static inline u32 from64to32(u64 x)
52{
53 return (x + ror64(x, 32)) >> 32;
54}
55
56static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
57 __u8 proto, __wsum sum)
58{
59#ifdef __powerpc64__
60 u64 s = (__force u32)sum;
61
62 s += (__force u32)saddr;
63 s += (__force u32)daddr;
64#ifdef __BIG_ENDIAN__
65 s += proto + len;
66#else
67 s += (proto + len) << 8;
68#endif
69 return (__force __wsum) from64to32(s);
70#else
71 __asm__("\n\
72 addc %0,%0,%1 \n\
73 adde %0,%0,%2 \n\
74 adde %0,%0,%3 \n\
75 addze %0,%0 \n\
76 "
77 : "=r" (sum)
78 : "r" (daddr), "r"(saddr), "r"(proto + len), "0"(sum));
79 return sum;
80#endif
81}
82
83
84
85
86
87static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len,
88 __u8 proto, __wsum sum)
89{
90 return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
91}
92
93#define HAVE_ARCH_CSUM_ADD
94static inline __wsum csum_add(__wsum csum, __wsum addend)
95{
96#ifdef __powerpc64__
97 u64 res = (__force u64)csum;
98#endif
99 if (__builtin_constant_p(csum) && csum == 0)
100 return addend;
101 if (__builtin_constant_p(addend) && addend == 0)
102 return csum;
103
104#ifdef __powerpc64__
105 res += (__force u64)addend;
106 return (__force __wsum)((u32)res + (res >> 32));
107#else
108 asm("addc %0,%0,%1;"
109 "addze %0,%0;"
110 : "+r" (csum) : "r" (addend) : "xer");
111 return csum;
112#endif
113}
114
115
116
117
118
119
120static inline __wsum ip_fast_csum_nofold(const void *iph, unsigned int ihl)
121{
122 const u32 *ptr = (const u32 *)iph + 1;
123#ifdef __powerpc64__
124 unsigned int i;
125 u64 s = *(const u32 *)iph;
126
127 for (i = 0; i < ihl - 1; i++, ptr++)
128 s += *ptr;
129 return (__force __wsum)from64to32(s);
130#else
131 __wsum sum, tmp;
132
133 asm("mtctr %3;"
134 "addc %0,%4,%5;"
135 "1: lwzu %1, 4(%2);"
136 "adde %0,%0,%1;"
137 "bdnz 1b;"
138 "addze %0,%0;"
139 : "=r" (sum), "=r" (tmp), "+b" (ptr)
140 : "r" (ihl - 2), "r" (*(const u32 *)iph), "r" (*ptr)
141 : "ctr", "xer", "memory");
142
143 return sum;
144#endif
145}
146
147static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
148{
149 return csum_fold(ip_fast_csum_nofold(iph, ihl));
150}
151
152
153
154
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156
157
158
159
160
161
162
163
164__wsum __csum_partial(const void *buff, int len, __wsum sum);
165
166static inline __wsum csum_partial(const void *buff, int len, __wsum sum)
167{
168 if (__builtin_constant_p(len) && len <= 16 && (len & 1) == 0) {
169 if (len == 2)
170 sum = csum_add(sum, (__force __wsum)*(const u16 *)buff);
171 if (len >= 4)
172 sum = csum_add(sum, (__force __wsum)*(const u32 *)buff);
173 if (len == 6)
174 sum = csum_add(sum, (__force __wsum)
175 *(const u16 *)(buff + 4));
176 if (len >= 8)
177 sum = csum_add(sum, (__force __wsum)
178 *(const u32 *)(buff + 4));
179 if (len == 10)
180 sum = csum_add(sum, (__force __wsum)
181 *(const u16 *)(buff + 8));
182 if (len >= 12)
183 sum = csum_add(sum, (__force __wsum)
184 *(const u32 *)(buff + 8));
185 if (len == 14)
186 sum = csum_add(sum, (__force __wsum)
187 *(const u16 *)(buff + 12));
188 if (len >= 16)
189 sum = csum_add(sum, (__force __wsum)
190 *(const u32 *)(buff + 12));
191 } else if (__builtin_constant_p(len) && (len & 3) == 0) {
192 sum = csum_add(sum, ip_fast_csum_nofold(buff, len >> 2));
193 } else {
194 sum = __csum_partial(buff, len, sum);
195 }
196 return sum;
197}
198
199
200
201
202
203static inline __sum16 ip_compute_csum(const void *buff, int len)
204{
205 return csum_fold(csum_partial(buff, len, 0));
206}
207
208#define _HAVE_ARCH_IPV6_CSUM
209__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
210 const struct in6_addr *daddr,
211 __u32 len, __u8 proto, __wsum sum);
212
213#endif
214#endif
215