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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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| 10 | |||
| 11 | /** |
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| 12 | * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder |
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| 13 | * |
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| 14 | * This is commonly provided by 32bit archs to provide an optimized 64bit |
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| 15 | * divide. |
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| 16 | */ |
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| 17 | static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder) |
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| 18 | { |
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| 19 | *remainder = dividend % divisor; |
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| 20 | return dividend / divisor; |
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| 21 | } |
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| 22 | |||
| 23 | /** |
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| 24 | * div_s64_rem - signed 64bit divide with 32bit divisor with remainder |
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| 25 | */ |
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| 26 | static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder) |
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| 27 | { |
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| 28 | *remainder = dividend % divisor; |
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| 29 | return dividend / divisor; |
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| 30 | } |
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| 31 | |||
| 32 | /** |
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| 33 | * div64_u64 - unsigned 64bit divide with 64bit divisor |
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| 34 | */ |
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| 35 | static inline u64 div64_u64(u64 dividend, u64 divisor) |
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| 36 | { |
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| 37 | return dividend / divisor; |
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| 38 | } |
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| 39 | |||
| 40 | /** |
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| 41 | * div64_s64 - signed 64bit divide with 64bit divisor |
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| 42 | */ |
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| 43 | static inline s64 div64_s64(s64 dividend, s64 divisor) |
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| 44 | { |
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| 45 | return dividend / divisor; |
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| 46 | } |
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| 47 | |||
| 48 | #elif BITS_PER_LONG == 32 |
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| 49 | |||
| 50 | #define div64_long(x,y) div_s64((x),(y)) |
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| 51 | |||
| 52 | #ifndef div_u64_rem |
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| 53 | static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder) |
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| 54 | { |
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| 55 | *remainder = do_div(dividend, divisor); |
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| 56 | return dividend; |
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| 57 | } |
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| 58 | #endif |
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| 59 | |||
| 60 | #ifndef div_s64_rem |
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| 61 | extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder); |
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| 62 | #endif |
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| 63 | |||
| 64 | #ifndef div64_u64 |
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| 65 | extern u64 div64_u64(u64 dividend, u64 divisor); |
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| 66 | #endif |
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| 67 | |||
| 68 | #ifndef div64_s64 |
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| 69 | extern s64 div64_s64(s64 dividend, s64 divisor); |
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| 70 | #endif |
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| 71 | |||
| 72 | #endif /* BITS_PER_LONG */ |
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| 73 | |||
| 74 | /** |
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| 75 | * div_u64 - unsigned 64bit divide with 32bit divisor |
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| 76 | * |
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| 77 | * This is the most common 64bit divide and should be used if possible, |
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| 78 | * as many 32bit archs can optimize this variant better than a full 64bit |
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| 79 | * divide. |
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| 80 | */ |
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| 81 | #ifndef div_u64 |
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| 82 | static inline u64 div_u64(u64 dividend, u32 divisor) |
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| 83 | { |
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| 84 | u32 remainder; |
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| 85 | return div_u64_rem(dividend, divisor, &remainder); |
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| 86 | } |
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| 87 | #endif |
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| 88 | |||
| 89 | /** |
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| 90 | * div_s64 - signed 64bit divide with 32bit divisor |
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| 91 | */ |
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| 92 | #ifndef div_s64 |
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| 93 | static inline s64 div_s64(s64 dividend, s32 divisor) |
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| 94 | { |
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| 95 | s32 remainder; |
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| 96 | return div_s64_rem(dividend, divisor, &remainder); |
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| 97 | } |
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| 98 | #endif |
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| 99 | |||
| 100 | u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder); |
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| 101 | |||
| 102 | static __always_inline u32 |
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| 103 | __iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder) |
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| 104 | { |
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| 105 | u32 ret = 0; |
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| 106 | |||
| 107 | while (dividend >= divisor) { |
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| 108 | /* The following asm() prevents the compiler from |
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| 109 | optimising this loop into a modulo operation. */ |
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| 110 | asm("" : "+rm"(dividend)); |
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| 111 | |||
| 112 | dividend -= divisor; |
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| 113 | ret++; |
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| 114 | } |
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| 115 | |||
| 116 | *remainder = dividend; |
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| 117 | |||
| 118 | return ret; |
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| 119 | } |
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| 120 | |||
| 121 | #endif /* _LINUX_MATH64_H */ |