EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/X64/EfiZeroMemRep4.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2008, 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 #   EfiZeroMemRep4.S
  15 #
  16 # Abstract:
  17 #
  18 #   ZeroMem function
  19 #
  20 # Notes:
  21 #
  22 #------------------------------------------------------------------------------
  23 #include <EfiBind.h>
  24
  25     .code:
  26
  27 .global ASM_PFX(EfiCommonLibZeroMem)
  28 #------------------------------------------------------------------------------
  29 #  VOID
  30 #  EfiCommonLibZeroMem (
  31 #    IN VOID   *Buffer,
  32 #    IN UINTN  Size
  33 #    );
  34 #------------------------------------------------------------------------------
  35 ASM_PFX(EfiCommonLibZeroMem):
  36       push   %rdi
  37       xor    %rax,%rax
  38       mov    %rcx,%rdi
  39       mov    %rdx,%rcx
  40       shr    $0x2,%rcx
  41       and    $0x3,%rdx
  42       rep stos %eax,%es:(%rdi)
  43       mov    %rdx,%rcx
  44       rep stos %al,%es:(%rdi)
  45       pop    %rdi
  46       retq