aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-x86/div64.h
diff options
context:
space:
mode:
authorAl Viro <viro@zeniv.linux.org.uk>2008-08-17 21:05:42 -0400
committerH. Peter Anvin <hpa@zytor.com>2008-10-23 01:55:20 -0400
commitbb8985586b7a906e116db835c64773b7a7d51663 (patch)
treede93ae58e88cc563d95cc124a73f3930594c6100 /include/asm-x86/div64.h
parent8ede0bdb63305d3353efd97e9af6210afb05734e (diff)
x86, um: ... and asm-x86 move
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'include/asm-x86/div64.h')
-rw-r--r--include/asm-x86/div64.h60
1 files changed, 0 insertions, 60 deletions
diff --git a/include/asm-x86/div64.h b/include/asm-x86/div64.h
deleted file mode 100644
index f9530f23f1d6..000000000000
--- a/include/asm-x86/div64.h
+++ /dev/null
@@ -1,60 +0,0 @@
1#ifndef ASM_X86__DIV64_H
2#define ASM_X86__DIV64_H
3
4#ifdef CONFIG_X86_32
5
6#include <linux/types.h>
7
8/*
9 * do_div() is NOT a C function. It wants to return
10 * two values (the quotient and the remainder), but
11 * since that doesn't work very well in C, what it
12 * does is:
13 *
14 * - modifies the 64-bit dividend _in_place_
15 * - returns the 32-bit remainder
16 *
17 * This ends up being the most efficient "calling
18 * convention" on x86.
19 */
20#define do_div(n, base) \
21({ \
22 unsigned long __upper, __low, __high, __mod, __base; \
23 __base = (base); \
24 asm("":"=a" (__low), "=d" (__high) : "A" (n)); \
25 __upper = __high; \
26 if (__high) { \
27 __upper = __high % (__base); \
28 __high = __high / (__base); \
29 } \
30 asm("divl %2":"=a" (__low), "=d" (__mod) \
31 : "rm" (__base), "0" (__low), "1" (__upper)); \
32 asm("":"=A" (n) : "a" (__low), "d" (__high)); \
33 __mod; \
34})
35
36static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
37{
38 union {
39 u64 v64;
40 u32 v32[2];
41 } d = { dividend };
42 u32 upper;
43
44 upper = d.v32[1];
45 d.v32[1] = 0;
46 if (upper >= divisor) {
47 d.v32[1] = upper / divisor;
48 upper %= divisor;
49 }
50 asm ("divl %2" : "=a" (d.v32[0]), "=d" (*remainder) :
51 "rm" (divisor), "0" (d.v32[0]), "1" (upper));
52 return d.v64;
53}
54#define div_u64_rem div_u64_rem
55
56#else
57# include <asm-generic/div64.h>
58#endif /* CONFIG_X86_32 */
59
60#endif /* ASM_X86__DIV64_H */