MdePkg/Library/BaseMemoryLibOptPei/Ia32/ScanMem32.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   ScanMem32.Asm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   ScanMem32 function
  13 ;
  14 ; Notes:
  15 ;
  16 ;   The following BaseMemoryLib instances contain the same copy of this file:
  17 ;
  18 ;       BaseMemoryLibRepStr
  19 ;       BaseMemoryLibMmx
  20 ;       BaseMemoryLibSse2
  21 ;       BaseMemoryLibOptDxe
  22 ;       BaseMemoryLibOptPei
  23 ;
  24 ;------------------------------------------------------------------------------
  25
  26     SECTION .text
  27
  28 ;------------------------------------------------------------------------------
  29 ; CONST VOID *
  30 ; EFIAPI
  31 ; InternalMemScanMem32 (
  32 ;   IN      CONST VOID                *Buffer,
  33 ;   IN      UINTN                     Length,
  34 ;   IN      UINT32                    Value
  35 ;   );
  36 ;------------------------------------------------------------------------------
  37 global ASM_PFX(InternalMemScanMem32)
  38 ASM_PFX(InternalMemScanMem32):
  39     push    edi
  40     mov     ecx, [esp + 12]
  41     mov     edi, [esp + 8]
  42     mov     eax, [esp + 16]
  43     repne   scasd
  44     lea     eax, [edi - 4]
  45     cmovnz  eax, ecx
  46     pop     edi
  47     ret
  48