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   1 #ifndef _M68K_DIV64_H
   2 #define _M68K_DIV64_H
   3
   4 /* n = n / base; return rem; */
   5
   6 #define do_div(n, base) ({                                      \
   7         union {                                                 \
   8                 unsigned long n32[2];                           \
   9                 unsigned long long n64;                         \
  10         } __n;                                                  \
  11         unsigned long __rem, __upper;                           \
  12                                                                 \
  13         __n.n64 = (n);                                          \
  14         if ((__upper = __n.n32[0])) {                           \
  15                 asm ("divul.l %2,%1:%0"                         \
  16                         : "=d" (__n.n32[0]), "=d" (__upper)     \
  17                         : "d" (base), "0" (__n.n32[0]));        \
  18         }                                                       \
  19         asm ("divu.l %2,%1:%0"                                  \
  20                 : "=d" (__n.n32[1]), "=d" (__rem)               \
  21                 : "d" (base), "1" (__upper), "0" (__n.n32[1])); \
  22         (n) = __n.n64;                                          \
  23         __rem;                                                  \
  24 })
  25
  26 #endif /* _M68K_DIV64_H */