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Linux/arch/x86/um/asm/checksum_32.h

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  1 /*
  2  * Licensed under the GPL
  3  */
  4 
  5 #ifndef __UM_SYSDEP_CHECKSUM_H
  6 #define __UM_SYSDEP_CHECKSUM_H
  7 
  8 static inline __sum16 ip_compute_csum(const void *buff, int len)
  9 {
 10     return csum_fold (csum_partial(buff, len, 0));
 11 }
 12 
 13 #define _HAVE_ARCH_IPV6_CSUM
 14 static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
 15                                           const struct in6_addr *daddr,
 16                                           __u32 len, unsigned short proto,
 17                                           __wsum sum)
 18 {
 19         __asm__(
 20                 "addl 0(%1), %0         ;\n"
 21                 "adcl 4(%1), %0         ;\n"
 22                 "adcl 8(%1), %0         ;\n"
 23                 "adcl 12(%1), %0        ;\n"
 24                 "adcl 0(%2), %0         ;\n"
 25                 "adcl 4(%2), %0         ;\n"
 26                 "adcl 8(%2), %0         ;\n"
 27                 "adcl 12(%2), %0        ;\n"
 28                 "adcl %3, %0            ;\n"
 29                 "adcl %4, %0            ;\n"
 30                 "adcl $0, %0            ;\n"
 31                 : "=&r" (sum)
 32                 : "r" (saddr), "r" (daddr),
 33                   "r"(htonl(len)), "r"(htonl(proto)), ""(sum));
 34 
 35         return csum_fold(sum);
 36 }
 37 
 38 /*
 39  *      Copy and checksum to user
 40  */
 41 #define HAVE_CSUM_COPY_USER
 42 static __inline__ __wsum csum_and_copy_to_user(const void *src,
 43                                                      void __user *dst,
 44                                                      int len, __wsum sum, int *err_ptr)
 45 {
 46         if (access_ok(VERIFY_WRITE, dst, len)) {
 47                 if (copy_to_user(dst, src, len)) {
 48                         *err_ptr = -EFAULT;
 49                         return (__force __wsum)-1;
 50                 }
 51 
 52                 return csum_partial(src, len, sum);
 53         }
 54 
 55         if (len)
 56                 *err_ptr = -EFAULT;
 57 
 58         return (__force __wsum)-1; /* invalid checksum */
 59 }
 60 
 61 #endif
 62 

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