1.Updated some functions header of BaseLib with new MWG spec

[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibSse2 / Ia32 / ZeroMem.asm

;------------------------------------------------------------------------------\r
;\r
; Copyright (c) 2006, Intel Corporation\r
; All rights reserved. This program and the accompanying materials\r
; are licensed and made available under the terms and conditions of the BSD License\r
; which accompanies this distribution.  The full text of the license may be found at\r
; http://opensource.org/licenses/bsd-license.php\r
;\r
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
;\r
; Module Name:\r
;\r
;   ZeroMem.asm\r
;\r
; Abstract:\r
;\r
;   ZeroMem function\r
;\r
; Notes:\r
;\r
;------------------------------------------------------------------------------\r
\r
    .686\r
    .model  flat,C\r
    .xmm\r
    .code\r
\r
;------------------------------------------------------------------------------\r
;  VOID *\r
;  _mem_ZeroMem (\r
;    IN VOID   *Buffer,\r
;    IN UINTN  Count\r
;    )\r
;------------------------------------------------------------------------------\r
InternalMemZeroMem  PROC    USES    edi\r
    mov     edi, [esp + 8]\r
    mov     edx, [esp + 12]\r
    xor     ecx, ecx\r
    sub     ecx, edi\r
    xor     eax, eax\r
    and     ecx, 15\r
    jz      @F\r
    cmp     ecx, edx\r
    cmova   ecx, edx\r
    sub     edx, ecx\r
    rep     stosb\r
@@:\r
    mov     ecx, edx\r
    and     edx, 15\r
    shr     ecx, 4\r
    jz      @ZeroBytes\r
    pxor    xmm0, xmm0\r
@@:\r
    movntdq [edi], xmm0\r
    add     edi, 16\r
    loop    @B\r
    mfence\r
@ZeroBytes:\r
    mov     ecx, edx\r
    rep     stosb\r
    mov     eax, [esp + 8]\r
    ret\r
InternalMemZeroMem  ENDP\r
\r
    END\r