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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2726 | vana | 1 | /*++ |
| 2 | |||
| 3 | Copyright (c) 1998 Intel Corporation |
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| 4 | |||
| 5 | Module Name: |
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| 6 | |||
| 7 | math.c |
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| 8 | |||
| 9 | Abstract: |
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| 10 | |||
| 11 | |||
| 12 | |||
| 13 | |||
| 14 | Revision History |
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| 15 | |||
| 16 | --*/ |
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| 17 | |||
| 18 | #include "lib.h" |
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| 19 | |||
| 20 | |||
| 21 | // |
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| 22 | // Declare runtime functions |
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| 23 | // |
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| 24 | |||
| 25 | #ifdef RUNTIME_CODE |
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| 26 | #pragma RUNTIME_CODE(LShiftU64) |
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| 27 | #pragma RUNTIME_CODE(RShiftU64) |
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| 28 | #pragma RUNTIME_CODE(MultU64x32) |
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| 29 | #pragma RUNTIME_CODE(DivU64x32) |
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| 30 | #endif |
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| 31 | |||
| 32 | // |
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| 33 | // |
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| 34 | // |
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| 35 | |||
| 36 | |||
| 37 | |||
| 38 | |||
| 39 | UINT64 |
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| 40 | LShiftU64 ( |
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| 41 | IN UINT64 Operand, |
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| 42 | IN UINTN Count |
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| 43 | ) |
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| 44 | // Left shift 64bit by 32bit and get a 64bit result |
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| 45 | { |
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| 46 | return Operand << Count; |
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| 47 | } |
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| 48 | |||
| 49 | UINT64 |
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| 50 | RShiftU64 ( |
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| 51 | IN UINT64 Operand, |
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| 52 | IN UINTN Count |
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| 53 | ) |
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| 54 | // Right shift 64bit by 32bit and get a 64bit result |
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| 55 | { |
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| 56 | return Operand >> Count; |
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| 57 | } |
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| 58 | |||
| 59 | |||
| 60 | UINT64 |
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| 61 | MultU64x32 ( |
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| 62 | IN UINT64 Multiplicand, |
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| 63 | IN UINTN Multiplier |
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| 64 | ) |
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| 65 | // Multiple 64bit by 32bit and get a 64bit result |
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| 66 | { |
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| 67 | return Multiplicand * Multiplier; |
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| 68 | } |
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| 69 | |||
| 70 | UINT64 |
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| 71 | DivU64x32 ( |
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| 72 | IN UINT64 Dividend, |
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| 73 | IN UINTN Divisor, |
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| 74 | OUT UINTN *Remainder OPTIONAL |
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| 75 | ) |
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| 76 | // divide 64bit by 32bit and get a 64bit result |
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| 77 | // N.B. only works for 31bit divisors!! |
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| 78 | { |
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| 79 | ASSERT (Divisor != 0); |
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| 80 | |||
| 81 | if (Remainder) { |
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| 82 | *Remainder = Dividend % Divisor; |
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| 83 | } |
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| 84 | |||
| 85 | return Dividend / Divisor; |
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| 86 | } |