MdePkg/Library/BaseMemoryLibMmx/Ia32/SetMem32.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 ;   SetMem32.asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   SetMem32 function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .686
  25     .model  flat,C
  26     .mmx
  27     .code
  28
  29 ;------------------------------------------------------------------------------
  30 ;  VOID *
  31 ;  EFIAPI
  32 ;  InternalMemSetMem32 (
  33 ;    IN VOID   *Buffer,
  34 ;    IN UINTN  Count,
  35 ;    IN UINT32 Value
  36 ;    );
  37 ;------------------------------------------------------------------------------
  38 InternalMemSetMem32 PROC
  39     mov     eax, [esp + 4]              ; eax <- Buffer as return value
  40     mov     ecx, [esp + 8]              ; ecx <- Count
  41     movd    mm0, dword ptr [esp + 12]             ; mm0 <- Value
  42     shr     ecx, 1                      ; ecx <- number of qwords to set
  43     mov     edx, eax                    ; edx <- Buffer
  44     jz      @SetDwords
  45     movq    mm1, mm0
  46     psllq   mm1, 32
  47     por     mm0, mm1
  48 @@:
  49     movq    qword ptr [edx], mm0
  50     lea     edx, [edx + 8]              ; use "lea" to avoid change in flags
  51     loop    @B
  52 @SetDwords:
  53     jnc     @F
  54     movd    dword ptr [edx], mm0
  55 @@:
  56     ret
  57 InternalMemSetMem32 ENDP
  58
  59     END