MdePkg/Library/BaseMemoryLibMmx/X64/ScanMem64.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 ;   ScanMem64.Asm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   ScanMem64 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     DEFAULT REL
  27     SECTION .text
  28
  29 ;------------------------------------------------------------------------------
  30 ; CONST VOID *
  31 ; EFIAPI
  32 ; InternalMemScanMem64 (
  33 ;   IN      CONST VOID                *Buffer,
  34 ;   IN      UINTN                     Length,
  35 ;   IN      UINT64                    Value
  36 ;   );
  37 ;------------------------------------------------------------------------------
  38 global ASM_PFX(InternalMemScanMem64)
  39 ASM_PFX(InternalMemScanMem64):
  40     push    rdi
  41     mov     rdi, rcx
  42     mov     rax, r8
  43     mov     rcx, rdx
  44     repne   scasq
  45     lea     rax, [rdi - 8]
  46     cmovnz  rax, rcx
  47     pop     rdi
  48     ret
  49