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
   8static 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
  14static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
  15                                          const struct in6_addr *daddr,
  16                                          __u32 len, __u8 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)), "0"(sum));
  34
  35        return csum_fold(sum);
  36}
  37
  38#endif
  39