EdkCompatibilityPkg/Foundation/Library/Pei/PeiLib/X64/Math.c

   1 /*++
   2
   3 Copyright (c) 2005, Intel Corporation. All rights reserved.<BR>
   4 This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 Module Name:
  13
  14   Math.c
  15
  16 Abstract:
  17
  18   64-bit Math worker functions for x64
  19
  20 --*/
  21
  22 #include "Efi.h"
  23 #include "Pei.h"
  24 #include "PeiLib.h"
  25
  26
  27 UINT64
  28 LShiftU64 (
  29   IN UINT64   Operand,
  30   IN UINTN    Count
  31   )
  32 /*++
  33
  34 Routine Description:
  35
  36   This routine allows a 64 bit value to be left shifted by 32 bits and returns the
  37   shifted value.
  38   Count is valid up 63. (Only Bits 0-5 is valid for Count)
  39
  40 Arguments:
  41
  42   Operand - Value to be shifted
  43
  44   Count   - Number of times to shift left.
  45
  46 Returns:
  47
  48   Value shifted left identified by the Count.
  49
  50 --*/
  51 {
  52   return Operand << Count;
  53 }
  54
  55
  56 UINT64
  57 MultU64x32 (
  58   IN UINT64   Multiplicand,
  59   IN UINTN    Multiplier
  60   )
  61 /*++
  62
  63 Routine Description:
  64
  65   This routine allows a 64 bit value to be multiplied with a 32 bit value returns
  66   64bit result.
  67   No checking if the result is greater than 64bits
  68
  69 Arguments:
  70
  71   Multiplicand  -
  72
  73   Multiplier    -
  74
  75 Returns:
  76
  77   Multiplicand * Multiplier
  78
  79 --*/
  80 {
  81   return Multiplicand * Multiplier;
  82 }
  83
  84 UINT64
  85 DivU64x32 (
  86   IN UINT64   Dividend,
  87   IN UINTN    Divisor,
  88   OUT UINTN   *Remainder OPTIONAL
  89   )
  90 /*++
  91
  92 Routine Description:
  93
  94   This routine allows a 64 bit value to be divided with a 32 bit value returns
  95   64bit result and the Remainder.
  96
  97 Arguments:
  98
  99   Dividend  -
 100
 101   Divisor   -
 102
 103   Remainder -
 104
 105 Returns:
 106
 107   Dividend  / Divisor
 108   Remainder = Dividend mod Divisor
 109
 110 N.B. only works for 31bit divisors!!
 111
 112 --*/
 113 {
 114   return Dividend/Divisor;
 115 }
 116