MdePkg/Library/BaseMemoryLibMmx/X64/SetMem32.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, 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 ;   SetMem32.asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   SetMem32 function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .code
  25
  26 ;------------------------------------------------------------------------------
  27 ;  VOID *
  28 ;  InternalMemSetMem32 (
  29 ;    IN VOID   *Buffer,
  30 ;    IN UINTN  Count,
  31 ;    IN UINT32 Value
  32 ;    )
  33 ;------------------------------------------------------------------------------
  34 InternalMemSetMem32 PROC
  35     DB      49h, 0fh, 6eh, 0c0h         ; movd mm0, r8 (Value)
  36     mov     rax, rcx                    ; rax <- Buffer
  37     xchg    rcx, rdx                    ; rcx <- Count  rdx <- Buffer
  38     shr     rcx, 1                      ; rcx <- # of qwords to set
  39     jz      @SetDwords
  40     DB      0fh, 70h, 0C0h, 44h         ; pshufw mm0, mm0, 44h
  41 @@:
  42     DB      0fh, 0e7h, 02h              ; movntq [rdx], mm0
  43     lea     rdx, [rdx + 8]              ; use "lea" to avoid flag changes
  44     loop    @B
  45     mfence
  46 @SetDwords:
  47     jnc     @F
  48     DB      0fh, 7eh, 02h               ; movd [rdx], mm0
  49 @@:
  50     ret
  51 InternalMemSetMem32 ENDP
  52
  53     END