kernel/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         unsigned long __base = (base);                          \
  19                                                                 \
  20         __n.n64 = (n);                                          \
  21         if ((__upper = __n.n32[0])) {                           \
  22                 asm ("divul.l %2,%1:%0"                         \
  23                      : "=d" (__n.n32[0]), "=d" (__upper)        \
  24                      : "d" (__base), "0" (__n.n32[0]));         \
  25         }                                                       \
  26         asm ("divu.l %2,%1:%0"                                  \
  27              : "=d" (__n.n32[1]), "=d" (__rem)                  \
  28              : "d" (__base), "1" (__upper), "0" (__n.n32[1]));  \
  29         (n) = __n.n64;                                          \
  30         __rem;                                                  \
  31 })
  32
  33 #endif /* CONFIG_CPU_HAS_NO_MULDIV64 */
  34
  35 #endif /* _M68K_DIV64_H */