EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/EfiZeroMemRep4.asm

   1 ;/*++
   2 ;
   3 ;Copyright (c) 2007, 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   ;EfiZeroMemRep4.asm
  15 ;
  16 ;Abstract:
  17 ;
  18   ;This is the code that uses rep stosd ZeroMem service
  19 ;
  20 ;--*/
  21 ;
  22 ;---------------------------------------------------------------------------
  23     .686
  24     .model  flat,C
  25     .code
  26
  27 ;---------------------------------------------------------------------------
  28 ;#include "Tiano.h"
  29 ;
  30 ;VOID
  31 ;EfiCommonLibZeroMem (
  32   ;IN VOID   *Buffer,
  33   ;IN UINTN  Count
  34   ;)
  35 ;/*++
  36 ;
  37 ;Input:  VOID   *Buffer - Pointer to buffer to clear
  38         ;UINTN  Count  - Number of bytes to clear
  39 ;
  40 ;Output: None.
  41 ;
  42 ;Saves:
  43 ;
  44 ;Modifies:
  45 ;
  46 ;Description:  This function uses rep stosd to zero memory.
  47 ;
  48 ;--*/
  49 EfiCommonLibZeroMem PROC
  50     push        ebp
  51     mov         ebp,esp
  52     push        edi
  53     mov         ecx,dword ptr [ebp+0Ch]
  54     test        ecx, ecx
  55     je          Exit
  56     xor         eax, eax
  57     mov         edi,dword ptr [ebp+8]
  58     mov         edx, ecx
  59     shr         ecx, 2
  60     and         edx, 3
  61     rep         stosd
  62     mov         ecx, edx
  63     rep         stosb
  64 Exit:
  65     pop         edi
  66     pop         ebp
  67     ret
  68
  69 EfiCommonLibZeroMem ENDP
  70         END