/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _M68K_DIV64_H
#define _M68K_DIV64_H

#ifdef CONFIG_CPU_HAS_NO_MULDIV64
#include <asm-generic/div64.h>
#else

#include <linux/types.h>

/* n = n / base; return rem; */

#define do_div(n, base) ({                                      \
        union {                                                 \
                unsigned long n32[2];                           \
                unsigned long long n64;                         \
        } __n;                                                  \
        unsigned long __rem, __upper;                           \
        unsigned long __base = (base);                          \
                                                                \
        __n.n64 = (n);                                          \
        if ((__upper = __n.n32[0])) {                           \
                asm ("divul.l %2,%1:%0"                         \
                     : "=d" (__n.n32[0]), "=d" (__upper)        \
                     : "d" (__base), "0" (__n.n32[0]));         \
        }                                                       \
        asm ("divu.l %2,%1:%0"                                  \
             : "=d" (__n.n32[1]), "=d" (__rem)                  \
             : "d" (__base), "1" (__upper), "0" (__n.n32[1]));  \
        (n) = __n.n64;                                          \
        __rem;                                                  \
})

/* defining this stops the unused helper function from being built */
#define __div64_32 __div64_32

#endif /* CONFIG_CPU_HAS_NO_MULDIV64 */

#endif /* _M68K_DIV64_H */