1 /* SPDX-License-Identifier: GPL-2.0 */ 1
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"
25 : "d" (__base), "" (__n.n
26 }
27 asm ("divu.l %2,%1:%0"
28 : "=d" (__n.n32[1]), "=d" (__rem)
29 : "d" (__base), "1" (__upper), ""
30 (n) = __n.n64;
31 __rem;
32 })
33
34 /* defining this stops the unused helper funct
35 #define __div64_32 __div64_32
36
37 #endif /* CONFIG_CPU_HAS_NO_MULDIV64 */
38
39 #endif /* _M68K_DIV64_H */
40
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