EdkCompatibilityPkg/Foundation/Library/CompilerStub/X64/memsetRep4.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2007, Intel Corporation
   4 ; All rights reserved. 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 ;   SetMem.asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   memset function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .code
  25
  26 ;------------------------------------------------------------------------------
  27 ;  VOID *
  28 ;  memset (
  29 ;    OUT VOID   *Buffer,
  30 ;    IN  UINT8  Value,
  31 ;    IN  UINTN  Count
  32 ;    )
  33 ;------------------------------------------------------------------------------
  34 memset   PROC    USES    rdi
  35     cmp     r8, 0                      ; if Size == 0, do nothing
  36     mov     r9,  rcx
  37     je      @SetDone
  38     mov     al,  dl
  39     mov     ah,  al
  40     shrd    edx, eax, 16
  41     shld    eax, edx, 16
  42     mov     rdi, rcx
  43     mov     rcx, r8
  44     shr     rcx, 2
  45     rep     stosd
  46     mov     rcx, r8
  47     and     rcx, 3
  48     rep     stosb
  49 @SetDone:
  50     mov     rax, r9
  51     ret
  52 memset   ENDP
  53
  54     END
  55