kernel-ark/include/asm-s390/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

50 lines
1.3 KiB
C

#ifndef __S390_DIV64
#define __S390_DIV64
#ifndef __s390x__
/* for do_div "base" needs to be smaller than 2^31-1 */
#define do_div(n, base) ({ \
unsigned long long __n = (n); \
unsigned long __r; \
\
asm (" slr 0,0\n" \
" l 1,%1\n" \
" srdl 0,1\n" \
" dr 0,%2\n" \
" alr 1,1\n" \
" alr 0,0\n" \
" lhi 2,1\n" \
" n 2,%1\n" \
" alr 0,2\n" \
" clr 0,%2\n" \
" jl 0f\n" \
" slr 0,%2\n" \
" ahi 1,1\n" \
"0: st 1,%1\n" \
" l 1,4+%1\n" \
" srdl 0,1\n" \
" dr 0,%2\n" \
" alr 1,1\n" \
" alr 0,0\n" \
" lhi 2,1\n" \
" n 2,4+%1\n" \
" alr 0,2\n" \
" clr 0,%2\n" \
" jl 1f\n" \
" slr 0,%2\n" \
" ahi 1,1\n" \
"1: st 1,4+%1\n" \
" lr %0,0" \
: "=d" (__r), "=m" (__n) \
: "d" (base), "m" (__n) : "0", "1", "2", "cc" ); \
(n) = (__n); \
__r; \
})
#else /* __s390x__ */
#include <asm-generic/div64.h>
#endif /* __s390x__ */
#endif