MdePkg/Library/BaseMemoryLibMmx/X64/SetMem.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, 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 ;   SetMem.asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   SetMem function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .code
  25
  26 ;------------------------------------------------------------------------------
  27 ; VOID *
  28 ; EFIAPI
  29 ; InternalMemSetMem (
  30 ;   OUT     VOID                      *Buffer,
  31 ;   IN      UINTN                     Length,
  32 ;   IN      UINT8                     Value
  33 ;   );
  34 ;------------------------------------------------------------------------------
  35 InternalMemSetMem   PROC    USES    rdi
  36     mov     rax, r8
  37     mov     ah, al
  38     DB      48h, 0fh, 6eh, 0c0h         ; movd mm0, rax
  39     mov     r8, rcx
  40     mov     rdi, r8                     ; rdi <- Buffer
  41     mov     rcx, rdx
  42     and     edx, 7
  43     shr     rcx, 3
  44     jz      @SetBytes
  45     DB      0fh, 70h, 0C0h, 00h         ; pshufw mm0, mm0, 0h
  46 @@:
  47     DB      0fh, 0e7h, 07h              ; movntq [rdi], mm0
  48     add     rdi, 8
  49     loop    @B
  50     mfence
  51 @SetBytes:
  52     mov     ecx, edx
  53     rep     stosb
  54     mov     rax, r8
  55     ret
  56 InternalMemSetMem   ENDP
  57
  58     END