arch/um/kernel/checksum.c

   1 #include "asm/uaccess.h"
   2 #include "linux/errno.h"
   3 #include "linux/module.h"
   4
   5 unsigned int arch_csum_partial(const unsigned char *buff, int len, int sum);
   6
   7 unsigned int csum_partial(unsigned char *buff, int len, int sum)
   8 {
   9         return arch_csum_partial(buff, len, sum);
  10 }
  11
  12 EXPORT_SYMBOL(csum_partial);
  13
  14 unsigned int csum_partial_copy_to(const unsigned char *src,
  15                                   unsigned char __user *dst, int len, int sum,
  16                                   int *err_ptr)
  17 {
  18         if(copy_to_user(dst, src, len)){
  19                 *err_ptr = -EFAULT;
  20                 return(-1);
  21         }
  22
  23         return(arch_csum_partial(src, len, sum));
  24 }
  25
  26 unsigned int csum_partial_copy_from(const unsigned char __user *src,
  27                                     unsigned char *dst, int len, int sum,
  28                                     int *err_ptr)
  29 {
  30         if(copy_from_user(dst, src, len)){
  31                 *err_ptr = -EFAULT;
  32                 return(-1);
  33         }
  34
  35         return arch_csum_partial(dst, len, sum);
  36 }