MdePkg/Library/BaseMemoryLibMmx/X64/ZeroMem.S

   1 #
   2 # ConvertAsm.py: Automatically generated from ZeroMem.asm
   3 #
   4 #------------------------------------------------------------------------------
   5 #
   6 # Copyright (c) 2006 - 2008, Intel Corporation
   7 # All rights reserved. This program and the accompanying materials
   8 # are licensed and made available under the terms and conditions of the BSD License
   9 # which accompanies this distribution.  The full text of the license may be found at
  10 # http://opensource.org/licenses/bsd-license.php
  11 #
  12 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 #
  15 # Module Name:
  16 #
  17 #   ZeroMem.S
  18 #
  19 # Abstract:
  20 #
  21 #   ZeroMem function
  22 #
  23 # Notes:
  24 #
  25 #------------------------------------------------------------------------------
  26
  27
  28 #------------------------------------------------------------------------------
  29 #  VOID *
  30 #  InternalMemZeroMem (
  31 #    IN VOID   *Buffer,
  32 #    IN UINTN  Count
  33 #    );
  34 #------------------------------------------------------------------------------
  35 .intel_syntax noprefix
  36 .globl ASM_PFX(InternalMemZeroMem)
  37 ASM_PFX(InternalMemZeroMem):
  38     push    rdi
  39     mov     rdi, rcx
  40     mov     rcx, rdx
  41     mov     r8, rdi
  42     and     edx, 7
  43     shr     rcx, 3
  44     jz      L_ZeroBytes
  45     pxor    mm0, mm0
  46 L0:
  47     movntq  [rdi], mm0
  48     add     rdi, 8
  49     loop    L0
  50     mfence
  51 L_ZeroBytes:
  52     xor     eax, eax
  53     mov     ecx, edx
  54     rep     stosb
  55     mov     rax, r8
  56     pop     rdi
  57     ret
  58