1 /* $NetBSD: math.c,v 1.1.1.1 2014/04/01 16:16:07 jakllsch Exp $ */ 2 3 /*++ 4 5 Copyright (c) 1998 Intel Corporation 6 7 Module Name: 8 9 math.c 10 11 Abstract: 12 13 14 15 16 Revision History 17 18 --*/ 19 20 #include "lib.h" 21 22 23 // 24 // Declare runtime functions 25 // 26 27 #ifdef RUNTIME_CODE 28 #ifndef __GNUC__ 29 #pragma RUNTIME_CODE(LShiftU64) 30 #pragma RUNTIME_CODE(RShiftU64) 31 #pragma RUNTIME_CODE(MultU64x32) 32 #pragma RUNTIME_CODE(DivU64x32) 33 #endif 34 #endif 35 36 // 37 // 38 // 39 40 41 42 43 UINT64 44 LShiftU64 ( 45 IN UINT64 Operand, 46 IN UINTN Count 47 ) 48 // Left shift 64bit by 32bit and get a 64bit result 49 { 50 return Operand << Count; 51 } 52 53 UINT64 54 RShiftU64 ( 55 IN UINT64 Operand, 56 IN UINTN Count 57 ) 58 // Right shift 64bit by 32bit and get a 64bit result 59 { 60 return Operand >> Count; 61 } 62 63 64 UINT64 65 MultU64x32 ( 66 IN UINT64 Multiplicand, 67 IN UINTN Multiplier 68 ) 69 // Multiple 64bit by 32bit and get a 64bit result 70 { 71 return Multiplicand * Multiplier; 72 } 73 74 UINT64 75 DivU64x32 ( 76 IN UINT64 Dividend, 77 IN UINTN Divisor, 78 OUT UINTN *Remainder OPTIONAL 79 ) 80 // divide 64bit by 32bit and get a 64bit result 81 // N.B. only works for 31bit divisors!! 82 { 83 ASSERT (Divisor != 0); 84 85 if (Remainder) { 86 *Remainder = Dividend % Divisor; 87 } 88 89 return Dividend / Divisor; 90 } 91