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2418f4f2 RZ |
1 | #ifndef _LINUX_MATH64_H |
2 | #define _LINUX_MATH64_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | #include <asm/div64.h> | |
6 | ||
7 | #if BITS_PER_LONG == 64 | |
8 | ||
9 | /** | |
10 | * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder | |
11 | * | |
12 | * This is commonly provided by 32bit archs to provide an optimized 64bit | |
13 | * divide. | |
14 | */ | |
15 | static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder) | |
16 | { | |
17 | *remainder = dividend % divisor; | |
18 | return dividend / divisor; | |
19 | } | |
20 | ||
21 | /** | |
22 | * div_s64_rem - signed 64bit divide with 32bit divisor with remainder | |
23 | */ | |
24 | static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder) | |
25 | { | |
26 | *remainder = dividend % divisor; | |
27 | return dividend / divisor; | |
28 | } | |
29 | ||
6f6d6a1a RZ |
30 | /** |
31 | * div64_u64 - unsigned 64bit divide with 64bit divisor | |
32 | */ | |
33 | static inline u64 div64_u64(u64 dividend, u64 divisor) | |
34 | { | |
35 | return dividend / divisor; | |
36 | } | |
37 | ||
658716d1 BB |
38 | /** |
39 | * div64_s64 - signed 64bit divide with 64bit divisor | |
40 | */ | |
41 | static inline s64 div64_s64(s64 dividend, s64 divisor) | |
42 | { | |
43 | return dividend / divisor; | |
44 | } | |
45 | ||
2418f4f2 RZ |
46 | #elif BITS_PER_LONG == 32 |
47 | ||
48 | #ifndef div_u64_rem | |
49 | static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder) | |
50 | { | |
51 | *remainder = do_div(dividend, divisor); | |
52 | return dividend; | |
53 | } | |
54 | #endif | |
55 | ||
56 | #ifndef div_s64_rem | |
57 | extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder); | |
58 | #endif | |
59 | ||
6f6d6a1a RZ |
60 | #ifndef div64_u64 |
61 | extern u64 div64_u64(u64 dividend, u64 divisor); | |
62 | #endif | |
63 | ||
658716d1 BB |
64 | #ifndef div64_s64 |
65 | extern s64 div64_s64(s64 dividend, s64 divisor); | |
66 | #endif | |
67 | ||
2418f4f2 RZ |
68 | #endif /* BITS_PER_LONG */ |
69 | ||
70 | /** | |
71 | * div_u64 - unsigned 64bit divide with 32bit divisor | |
72 | * | |
73 | * This is the most common 64bit divide and should be used if possible, | |
74 | * as many 32bit archs can optimize this variant better than a full 64bit | |
75 | * divide. | |
76 | */ | |
77 | #ifndef div_u64 | |
78 | static inline u64 div_u64(u64 dividend, u32 divisor) | |
79 | { | |
80 | u32 remainder; | |
81 | return div_u64_rem(dividend, divisor, &remainder); | |
82 | } | |
83 | #endif | |
84 | ||
85 | /** | |
86 | * div_s64 - signed 64bit divide with 32bit divisor | |
87 | */ | |
88 | #ifndef div_s64 | |
89 | static inline s64 div_s64(s64 dividend, s32 divisor) | |
90 | { | |
91 | s32 remainder; | |
92 | return div_s64_rem(dividend, divisor, &remainder); | |
93 | } | |
94 | #endif | |
95 | ||
f595ec96 JF |
96 | u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder); |
97 | ||
d5e181f7 JF |
98 | static __always_inline u32 |
99 | __iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder) | |
100 | { | |
101 | u32 ret = 0; | |
102 | ||
103 | while (dividend >= divisor) { | |
104 | /* The following asm() prevents the compiler from | |
105 | optimising this loop into a modulo operation. */ | |
106 | asm("" : "+rm"(dividend)); | |
107 | ||
108 | dividend -= divisor; | |
109 | ret++; | |
110 | } | |
111 | ||
112 | *remainder = dividend; | |
113 | ||
114 | return ret; | |
115 | } | |
116 | ||
2418f4f2 | 117 | #endif /* _LINUX_MATH64_H */ |