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 */

 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/* defining this stops the unused helper function from being built */
35#define __div64_32 __div64_32
36
37#endif /* CONFIG_CPU_HAS_NO_MULDIV64 */
38
39#endif /* _M68K_DIV64_H */