xref: /openbmc/linux/arch/m68k/include/asm/div64.h (revision c819e2cf)
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 */
36