EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/Power10U64.c

   1 /*++
   2
   3 Copyright (c) 2006, Intel Corporation
   4 All rights reserved. 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   Power10U64.c
  15
  16 Abstract:
  17
  18   Calculates Operand * 10 ^ Power
  19
  20 --*/
  21
  22 #include "Tiano.h"
  23
  24 UINT64
  25 MultU64x32 (
  26   IN UINT64   Multiplicand,
  27   IN UINTN    Multiplier
  28   );
  29
  30 UINT64
  31 Power10U64 (
  32   IN UINT64   Operand,
  33   IN UINTN    Power
  34   )
  35 /*++
  36
  37 Routine Description:
  38
  39   Raise 10 to the power of Power, and multiply the result with Operand
  40
  41 Arguments:
  42
  43   Operand  - multiplicand
  44   Power    - power
  45
  46 Returns:
  47
  48   Operand * 10 ^ Power
  49
  50 --*/
  51 {
  52   __asm {
  53   mov    ecx, Power
  54   jcxz   _Power10U64_Done
  55
  56 _Power10U64_Wend:
  57   push   10
  58   push   dword ptr Operand[4]
  59   push   dword ptr Operand[0]
  60   call   MultU64x32
  61   mov    dword ptr Operand[0], eax
  62   mov    dword ptr Operand[4], edx
  63   loop   _Power10U64_Wend
  64
  65 _Power10U64_Done:
  66   }
  67 }