MdePkg/Library/BaseMemoryLibMmx/Ia32/ScanMem64.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006 - 2008, 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 ;   ScanMem64.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   ScanMem64 function
  19 ;
  20 ; Notes:
  21 ;
  22 ;   The following BaseMemoryLib instances contain the same copy of this file:
  23 ;
  24 ;       BaseMemoryLibRepStr
  25 ;       BaseMemoryLibMmx
  26 ;       BaseMemoryLibSse2
  27 ;       BaseMemoryLibOptDxe
  28 ;       BaseMemoryLibOptPei
  29 ;
  30 ;------------------------------------------------------------------------------
  31
  32     SECTION .text
  33
  34 ;------------------------------------------------------------------------------
  35 ; CONST VOID *
  36 ; EFIAPI
  37 ; InternalMemScanMem64 (
  38 ;   IN      CONST VOID                *Buffer,
  39 ;   IN      UINTN                     Length,
  40 ;   IN      UINT64                    Value
  41 ;   );
  42 ;------------------------------------------------------------------------------
  43 global ASM_PFX(InternalMemScanMem64)
  44 ASM_PFX(InternalMemScanMem64):
  45     push    edi
  46     mov     ecx, [esp + 12]
  47     mov     eax, [esp + 16]
  48     mov     edx, [esp + 20]
  49     mov     edi, [esp + 8]
  50 .0:
  51     cmp     eax, [edi]
  52     lea     edi, [edi + 8]
  53     loopne  .0
  54     jne     .1
  55     cmp     edx, [edi - 4]
  56     jecxz   .1
  57     jne     .0
  58 .1:
  59     lea     eax, [edi - 8]
  60     cmovne  eax, ecx
  61     pop     edi
  62     ret
  63