arch/m68k/include/asm/div64.h

   1 #ifndef _M68K_DIV64_H
   2 #define _M68K_DIV64_H
   3
   4 #ifdef CONFIG_CPU_HAS_NO_MULDIV64
   5 #include <asm-generic/div64.h>
   6 #else
   7
   8 #include <linux/types.h>
   9
  10 /* n = n / base; return rem; */
  11
  12 #define do_div(n, base) ({                                      \
  13         union {                                                 \
  14                 unsigned long n32[2];                           \
  15                 unsigned long long n64;                         \
  16         } __n;                                                  \
  17         unsigned long __rem, __upper;                           \
  18                                                                 \
  19         __n.n64 = (n);                                          \
  20         if ((__upper = __n.n32[0])) {                           \
  21                 asm ("divul.l %2,%1:%0"                         \
  22                         : "=d" (__n.n32[0]), "=d" (__upper)     \
  23                         : "d" (base), "0" (__n.n32[0]));        \
  24         }                                                       \
  25         asm ("divu.l %2,%1:%0"                                  \
  26                 : "=d" (__n.n32[1]), "=d" (__rem)               \
  27                 : "d" (base), "1" (__upper), "0" (__n.n32[1])); \
  28         (n) = __n.n64;                                          \
  29         __rem;                                                  \
  30 })
  31
  32 #endif /* CONFIG_CPU_HAS_NO_MULDIV64 */
  33
  34 #endif /* _M68K_DIV64_H */