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);
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58
59#define csum_partial_copy_from_user(src, dst, len, sum, errp) \
60 csum_partial_copy_generic((__force const void *)(src), (dst), (len), (sum), (errp), NULL)
61
62#define csum_partial_copy_nocheck(src, dst, len, sum) \
63 csum_partial_copy_generic((src), (dst), (len), (sum), NULL, NULL)
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70static inline __sum16 csum_fold(__wsum sum)
71{
72 unsigned int tmp;
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75 __asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum));
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79 return (__force __sum16)(~((__force u32)sum + tmp) >> 16);
80}
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86static inline __sum16 ip_compute_csum(const void *buff, int len)
87{
88 return csum_fold(csum_partial(buff, len, 0));
89}
90
91static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
92 unsigned short len,
93 unsigned short proto,
94 __wsum sum)
95{
96#ifdef __powerpc64__
97 unsigned long s = (__force u32)sum;
98
99 s += (__force u32)saddr;
100 s += (__force u32)daddr;
101 s += proto + len;
102 s += (s >> 32);
103 return (__force __wsum) s;
104#else
105 __asm__("\n\
106 addc %0,%0,%1 \n\
107 adde %0,%0,%2 \n\
108 adde %0,%0,%3 \n\
109 addze %0,%0 \n\
110 "
111 : "=r" (sum)
112 : "r" (daddr), "r"(saddr), "r"(proto + len), "0"(sum));
113 return sum;
114#endif
115}
116#endif
117#endif
118