MdePkg/Library/BaseMemoryLibOptPei/X64/ScanMem8.asm

   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 ;   ScanMem8.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   ScanMem8 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     .code
  33
  34 ;------------------------------------------------------------------------------
  35 ; CONST VOID *
  36 ; EFIAPI
  37 ; InternalMemScanMem8 (
  38 ;   IN      CONST VOID                *Buffer,
  39 ;   IN      UINTN                     Length,
  40 ;   IN      UINT8                     Value
  41 ;   );
  42 ;------------------------------------------------------------------------------
  43 InternalMemScanMem8 PROC    USES    rdi
  44     mov     rdi, rcx
  45     mov     rcx, rdx
  46     mov     rax, r8
  47     repne   scasb
  48     lea     rax, [rdi - 1]
  49     cmovnz  rax, rcx                    ; set rax to 0 if not found
  50     ret
  51 InternalMemScanMem8 ENDP
  52
  53     END