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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-m32r/div64.h
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'include/asm-m32r/div64.h')
-rw-r--r--include/asm-m32r/div64.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/include/asm-m32r/div64.h b/include/asm-m32r/div64.h
new file mode 100644
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+++ b/include/asm-m32r/div64.h
@@ -0,0 +1,38 @@
1#ifndef _ASM_M32R_DIV64
2#define _ASM_M32R_DIV64
3
4/* $Id$ */
5
6/* unsigned long long division.
7 * Input:
8 * unsigned long long n
9 * unsigned long base
10 * Output:
11 * n = n / base;
12 * return value = n % base;
13 */
14#define do_div(n, base) \
15({ \
16 unsigned long _res, _high, _mid, _low; \
17 \
18 _low = (n) & 0xffffffffUL; \
19 _high = (n) >> 32; \
20 if (_high) { \
21 _mid = (_high % (unsigned long)(base)) << 16; \
22 _high = _high / (unsigned long)(base); \
23 _mid += _low >> 16; \
24 _low &= 0x0000ffffUL; \
25 _low += (_mid % (unsigned long)(base)) << 16; \
26 _mid = _mid / (unsigned long)(base); \
27 _res = _low % (unsigned long)(base); \
28 _low = _low / (unsigned long)(base); \
29 n = _low + ((long long)_mid << 16) + \
30 ((long long)_high << 32); \
31 } else { \
32 _res = _low % (unsigned long)(base); \
33 n = (_low / (unsigned long)(base)); \
34 } \
35 _res; \
36})
37
38#endif /* _ASM_M32R_DIV64 */