kernel-ark/include/asm-m68k/div64.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

27 lines
621 B
C

#ifndef _M68K_DIV64_H
#define _M68K_DIV64_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; \
\
__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; \
})
#endif /* _M68K_DIV64_H */