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| Rev | Author | Line No. | Line |
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| 3031 | serge | 1 | #ifndef _LINUX_MATH64_H |
| 2 | #define _LINUX_MATH64_H |
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| 3 | |||
| 4 | #include |
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| 5 | #include |
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| 6 | |||
| 7 | #if BITS_PER_LONG == 64 |
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| 8 | |||
| 9 | #define div64_long(x,y) div64_s64((x),(y)) |
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| 4065 | Serge | 10 | #define div64_ul(x, y) div64_u64((x), (y)) |
| 3031 | serge | 11 | |
| 12 | /** |
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| 13 | * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder |
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| 14 | * |
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| 15 | * This is commonly provided by 32bit archs to provide an optimized 64bit |
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| 16 | * divide. |
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| 17 | */ |
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| 18 | static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder) |
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| 19 | { |
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| 20 | *remainder = dividend % divisor; |
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| 21 | return dividend / divisor; |
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| 22 | } |
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| 23 | |||
| 24 | /** |
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| 25 | * div_s64_rem - signed 64bit divide with 32bit divisor with remainder |
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| 26 | */ |
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| 27 | static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder) |
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| 28 | { |
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| 29 | *remainder = dividend % divisor; |
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| 30 | return dividend / divisor; |
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| 31 | } |
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| 32 | |||
| 33 | /** |
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| 34 | * div64_u64 - unsigned 64bit divide with 64bit divisor |
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| 35 | */ |
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| 36 | static inline u64 div64_u64(u64 dividend, u64 divisor) |
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| 37 | { |
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| 38 | return dividend / divisor; |
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| 39 | } |
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| 40 | |||
| 41 | /** |
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| 42 | * div64_s64 - signed 64bit divide with 64bit divisor |
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| 43 | */ |
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| 44 | static inline s64 div64_s64(s64 dividend, s64 divisor) |
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| 45 | { |
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| 46 | return dividend / divisor; |
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| 47 | } |
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| 48 | |||
| 49 | #elif BITS_PER_LONG == 32 |
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| 50 | |||
| 51 | #define div64_long(x,y) div_s64((x),(y)) |
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| 4065 | Serge | 52 | #define div64_ul(x, y) div_u64((x), (y)) |
| 3031 | serge | 53 | |
| 54 | #ifndef div_u64_rem |
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| 55 | static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder) |
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| 56 | { |
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| 57 | *remainder = do_div(dividend, divisor); |
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| 58 | return dividend; |
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| 59 | } |
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| 60 | #endif |
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| 61 | |||
| 62 | #ifndef div_s64_rem |
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| 63 | extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder); |
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| 64 | #endif |
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| 65 | |||
| 66 | #ifndef div64_u64 |
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| 67 | extern u64 div64_u64(u64 dividend, u64 divisor); |
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| 68 | #endif |
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| 69 | |||
| 70 | #ifndef div64_s64 |
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| 71 | extern s64 div64_s64(s64 dividend, s64 divisor); |
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| 72 | #endif |
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| 73 | |||
| 74 | #endif /* BITS_PER_LONG */ |
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| 75 | |||
| 76 | /** |
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| 77 | * div_u64 - unsigned 64bit divide with 32bit divisor |
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| 78 | * |
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| 79 | * This is the most common 64bit divide and should be used if possible, |
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| 80 | * as many 32bit archs can optimize this variant better than a full 64bit |
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| 81 | * divide. |
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| 82 | */ |
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| 83 | #ifndef div_u64 |
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| 84 | static inline u64 div_u64(u64 dividend, u32 divisor) |
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| 85 | { |
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| 86 | u32 remainder; |
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| 87 | return div_u64_rem(dividend, divisor, &remainder); |
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| 88 | } |
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| 89 | #endif |
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| 90 | |||
| 91 | /** |
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| 92 | * div_s64 - signed 64bit divide with 32bit divisor |
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| 93 | */ |
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| 94 | #ifndef div_s64 |
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| 95 | static inline s64 div_s64(s64 dividend, s32 divisor) |
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| 96 | { |
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| 97 | s32 remainder; |
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| 98 | return div_s64_rem(dividend, divisor, &remainder); |
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| 99 | } |
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| 100 | #endif |
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| 101 | |||
| 102 | u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder); |
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| 103 | |||
| 104 | static __always_inline u32 |
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| 105 | __iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder) |
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| 106 | { |
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| 107 | u32 ret = 0; |
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| 108 | |||
| 109 | while (dividend >= divisor) { |
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| 110 | /* The following asm() prevents the compiler from |
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| 111 | optimising this loop into a modulo operation. */ |
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| 112 | asm("" : "+rm"(dividend)); |
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| 113 | |||
| 114 | dividend -= divisor; |
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| 115 | ret++; |
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| 116 | } |
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| 117 | |||
| 118 | *remainder = dividend; |
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| 119 | |||
| 120 | return ret; |
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| 121 | } |
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| 122 | |||
| 123 | #endif /* _LINUX_MATH64_H */ |