EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/EfiSetMemRep4.c

   1 /*++
   2
   3 Copyright (c) 2007, 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   EfiSetMemRep4.c
  15
  16 Abstract:
  17
  18   This is the code that uses rep stosd SetMem service
  19
  20 --*/
  21
  22 #include "Tiano.h"
  23
  24 VOID
  25 EfiCommonLibSetMem (
  26   IN VOID   *Buffer,
  27   IN UINTN  Count,
  28   IN UINT8  Value
  29   )
  30 /*++
  31
  32 Input:  VOID   *Buffer - Pointer to buffer to write
  33         UINTN  Count   - Number of bytes to write
  34         UINT8  Value   - Value to write
  35
  36 Output: None.
  37
  38 Saves:
  39
  40 Modifies:
  41
  42 Description:  This function uses rep stosd to set memory.
  43
  44 --*/
  45 {
  46   __asm {
  47     mov         ecx, Count
  48     test        ecx, ecx
  49     je          Exit
  50     mov         al,  Value
  51     mov         ah,  al
  52     shrd        edx, eax, 16
  53     shld        eax, edx, 16
  54     mov         edx, ecx
  55     mov         edi, Buffer
  56     shr         ecx, 2
  57     rep stosd
  58     mov         ecx, edx
  59     and         ecx, 3
  60     rep stosb
  61 Exit:
  62   }
  63 }
  64