arch/m68k/include/asm/div64.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _M68K_DIV64_H
   3 #define _M68K_DIV64_H
   4
   5 #ifdef CONFIG_CPU_HAS_NO_MULDIV64
   6 #include <asm-generic/div64.h>
   7 #else
   8
   9 #include <linux/types.h>
  10
  11 /* n = n / base; return rem; */
  12
  13 #define do_div(n, base) ({                                      \
  14         union {                                                 \
  15                 unsigned long n32[2];                           \
  16                 unsigned long long n64;                         \
  17         } __n;                                                  \
  18         unsigned long __rem, __upper;                           \
  19         unsigned long __base = (base);                          \
  20                                                                 \
  21         __n.n64 = (n);                                          \
  22         if ((__upper = __n.n32[0])) {                           \
  23                 asm ("divul.l %2,%1:%0"                         \
  24                      : "=d" (__n.n32[0]), "=d" (__upper)        \
  25                      : "d" (__base), "0" (__n.n32[0]));         \
  26         }                                                       \
  27         asm ("divu.l %2,%1:%0"                                  \
  28              : "=d" (__n.n32[1]), "=d" (__rem)                  \
  29              : "d" (__base), "1" (__upper), "0" (__n.n32[1]));  \
  30         (n) = __n.n64;                                          \
  31         __rem;                                                  \
  32 })
  33
  34 #endif /* CONFIG_CPU_HAS_NO_MULDIV64 */
  35
  36 #endif /* _M68K_DIV64_H */