Linux kernel mirror (for testing)
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linux
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 */