OldMdePkg/Library/BaseMemoryLibMmx/X64/SetMem64.asm

;------------------------------------------------------------------------------
;
; Copyright (c) 2006, Intel Corporation
; All rights reserved. This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution.  The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
; Module Name:
;
;   SetMem64.asm
;
; Abstract:
;
;   SetMem64 function
;
; Notes:
;
;------------------------------------------------------------------------------

    .code

;------------------------------------------------------------------------------
;  VOID *
;  InternalMemSetMem64 (
;    IN VOID   *Buffer,
;    IN UINTN  Count,
;    IN UINT64 Value
;    )
;------------------------------------------------------------------------------
InternalMemSetMem64 PROC
    DB      49h, 0fh, 6eh, 0c0h         ; movd mm0, r8 (Value)
    mov     rax, rcx                    ; rax <- Buffer
    xchg    rcx, rdx                    ; rcx <- Count
@@:
    DB      0fh, 0e7h, 02h              ; movntq  [rdx], mm0
    add     rdx, 8
    loop    @B
    mfence
    ret
InternalMemSetMem64 ENDP

    END