MdePkg/Library/BaseMemoryLibMmx/Ia32/SetMem32.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   SetMem32.nasm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   SetMem32 function
  13 ;
  14 ; Notes:
  15 ;
  16 ;------------------------------------------------------------------------------
  17
  18     SECTION .text
  19
  20 ;------------------------------------------------------------------------------
  21 ;  VOID *
  22 ;  EFIAPI
  23 ;  InternalMemSetMem32 (
  24 ;    IN VOID   *Buffer,
  25 ;    IN UINTN  Count,
  26 ;    IN UINT32 Value
  27 ;    );
  28 ;------------------------------------------------------------------------------
  29 global ASM_PFX(InternalMemSetMem32)
  30 ASM_PFX(InternalMemSetMem32):
  31     mov     eax, [esp + 4]              ; eax <- Buffer as return value
  32     mov     ecx, [esp + 8]              ; ecx <- Count
  33     movd    mm0, dword [esp + 12]             ; mm0 <- Value
  34     shr     ecx, 1                      ; ecx <- number of qwords to set
  35     mov     edx, eax                    ; edx <- Buffer
  36     jz      @SetDwords
  37     movq    mm1, mm0
  38     psllq   mm1, 32
  39     por     mm0, mm1
  40 .0:
  41     movq    qword [edx], mm0
  42     lea     edx, [edx + 8]              ; use "lea" to avoid change in flags
  43     loop    .0
  44 @SetDwords:
  45     jnc     .1
  46     movd    dword [edx], mm0
  47 .1:
  48     ret
  49