EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/X64/EfiSetMemRep4.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2008, 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 #   EfiSetMemRep4.S
  15 #
  16 # Abstract:
  17 #
  18 #   SetMem function
  19 #
  20 # Notes:
  21 #
  22 #------------------------------------------------------------------------------
  23 #include <EfiBind.h>
  24
  25     .code:
  26
  27 .globl ASM_PFX(EfiCommonLibCopyMem)
  28
  29 #------------------------------------------------------------------------------
  30 # VOID
  31 # EfiCommonLibSetMem (
  32 #   OUT     VOID                      *Buffer,
  33 #   IN      UINTN                     Size,
  34 #   IN      UINT8                     Value
  35 #   );
  36 #------------------------------------------------------------------------------
  37 ASM_PFX(EfiCommonLibSetMem):
  38       push   %rdi
  39       cmp    $0x0,%rdx
  40       je     SetDone
  41       mov    %rcx,%rdi
  42       mov    %r8b,%al
  43       mov    %al,%ah
  44       shrd   $0x10,%eax,%ecx
  45       shld   $0x10,%ecx,%eax
  46       mov    %rdx,%rcx
  47       shr    $0x2,%rcx
  48       rep stos %eax,%es:(%rdi)
  49       mov    %rdx,%rcx
  50       and    $0x3,%rcx
  51       rep stos %al,%es:(%rdi)
  52 SetDone:
  53       pop    %rdi
  54       retq