EdkCompatibilityPkg/Foundation/Library/CompilerStub/X64/memsetRep8.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 ;   memsetRep8.asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   SetMem 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                     Length
  32 ;   );
  33 ;------------------------------------------------------------------------------
  34 memset   PROC    USES    rdi rbx
  35     cmp     r8, 0                      ; if Size == 0, do nothing
  36     mov     r9,  rcx
  37     je      @SetDone
  38     mov     rax, rdx
  39     mov     bl,  al
  40     mov     bh,  bl
  41     mov     ax,  bx
  42     shl     rax, 10h
  43     mov     ax,  bx
  44     mov     ebx, eax
  45     shl     rax, 20h
  46     mov     eax, ebx
  47     mov     rdi, rcx
  48     mov     rcx, r8
  49     shr     rcx, 3
  50     rep     stosq
  51     mov     rcx, rdx
  52     and     rcx, 7
  53     rep     stosb
  54 @SetDone:
  55     mov     rax, r9
  56     ret
  57 memset   ENDP
  58
  59     END
  60