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      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