1
2#ifndef _ASM_X86_CHECKSUM_64_H
3#define _ASM_X86_CHECKSUM_64_H
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11#include <linux/compiler.h>
12#include <linux/uaccess.h>
13#include <asm/byteorder.h>
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23static inline __sum16 csum_fold(__wsum sum)
24{
25 asm(" addl %1,%0\n"
26 " adcl $0xffff,%0"
27 : "=r" (sum)
28 : "r" ((__force u32)sum << 16),
29 "0" ((__force u32)sum & 0xffff0000));
30 return (__force __sum16)(~(__force u32)sum >> 16);
31}
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46static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
47{
48 unsigned int sum;
49
50 asm(" movl (%1), %0\n"
51 " subl $4, %2\n"
52 " jbe 2f\n"
53 " addl 4(%1), %0\n"
54 " adcl 8(%1), %0\n"
55 " adcl 12(%1), %0\n"
56 "1: adcl 16(%1), %0\n"
57 " lea 4(%1), %1\n"
58 " decl %2\n"
59 " jne 1b\n"
60 " adcl $0, %0\n"
61 " movl %0, %2\n"
62 " shrl $16, %0\n"
63 " addw %w2, %w0\n"
64 " adcl $0, %0\n"
65 " notl %0\n"
66 "2:"
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68
69
70 : "=r" (sum), "=r" (iph), "=r" (ihl)
71 : "1" (iph), "2" (ihl)
72 : "memory");
73 return (__force __sum16)sum;
74}
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86
87static inline __wsum
88csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
89 __u8 proto, __wsum sum)
90{
91 asm(" addl %1, %0\n"
92 " adcl %2, %0\n"
93 " adcl %3, %0\n"
94 " adcl $0, %0\n"
95 : "=r" (sum)
96 : "g" (daddr), "g" (saddr),
97 "g" ((len + proto)<<8), "0" (sum));
98 return sum;
99}
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113static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
114 __u32 len, __u8 proto,
115 __wsum sum)
116{
117 return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
118}
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130extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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133extern __visible __wsum csum_partial_copy_generic(const void *src, void *dst, int len);
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135extern __wsum csum_and_copy_from_user(const void __user *src, void *dst, int len);
136extern __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len);
137extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len);
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147extern __sum16 ip_compute_csum(const void *buff, int len);
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162struct in6_addr;
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164#define _HAVE_ARCH_IPV6_CSUM 1
165extern __sum16
166csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
167 __u32 len, __u8 proto, __wsum sum);
168
169static inline unsigned add32_with_carry(unsigned a, unsigned b)
170{
171 asm("addl %2,%0\n\t"
172 "adcl $0,%0"
173 : "=r" (a)
174 : "0" (a), "rm" (b));
175 return a;
176}
177
178#define HAVE_ARCH_CSUM_ADD
179static inline __wsum csum_add(__wsum csum, __wsum addend)
180{
181 return (__force __wsum)add32_with_carry((__force unsigned)csum,
182 (__force unsigned)addend);
183}
184
185#endif
186