1#ifndef _ASM_POWERPC_CHECKSUM_H
2#define _ASM_POWERPC_CHECKSUM_H
3#ifdef __KERNEL__
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17extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
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23extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
24 unsigned short len,
25 unsigned short proto,
26 __wsum sum);
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40extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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52extern __wsum csum_partial_copy_generic(const void *src, void *dst,
53 int len, __wsum sum,
54 int *src_err, int *dst_err);
55
56#ifdef __powerpc64__
57#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
58extern __wsum csum_and_copy_from_user(const void __user *src, void *dst,
59 int len, __wsum sum, int *err_ptr);
60#define HAVE_CSUM_COPY_USER
61extern __wsum csum_and_copy_to_user(const void *src, void __user *dst,
62 int len, __wsum sum, int *err_ptr);
63#else
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67
68#define csum_partial_copy_from_user(src, dst, len, sum, errp) \
69 csum_partial_copy_generic((__force const void *)(src), (dst), (len), (sum), (errp), NULL)
70#endif
71
72#define csum_partial_copy_nocheck(src, dst, len, sum) \
73 csum_partial_copy_generic((src), (dst), (len), (sum), NULL, NULL)
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80static inline __sum16 csum_fold(__wsum sum)
81{
82 unsigned int tmp;
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85 __asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum));
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89 return (__force __sum16)(~((__force u32)sum + tmp) >> 16);
90}
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96static inline __sum16 ip_compute_csum(const void *buff, int len)
97{
98 return csum_fold(csum_partial(buff, len, 0));
99}
100
101static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
102 unsigned short len,
103 unsigned short proto,
104 __wsum sum)
105{
106#ifdef __powerpc64__
107 unsigned long s = (__force u32)sum;
108
109 s += (__force u32)saddr;
110 s += (__force u32)daddr;
111 s += proto + len;
112 s += (s >> 32);
113 return (__force __wsum) s;
114#else
115 __asm__("\n\
116 addc %0,%0,%1 \n\
117 adde %0,%0,%2 \n\
118 adde %0,%0,%3 \n\
119 addze %0,%0 \n\
120 "
121 : "=r" (sum)
122 : "r" (daddr), "r"(saddr), "r"(proto + len), "0"(sum));
123 return sum;
124#endif
125}
126#endif
127#endif
128