ArmPkg/ArmDisassemblerLib: fix check for MSR instruction

[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibSse2 / X64 / ZeroMem.asm

;------------------------------------------------------------------------------\r
;\r
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r
; 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
    .code\r
\r
;------------------------------------------------------------------------------\r
;  VOID *\r
;  InternalMemZeroMem (\r
;    IN VOID   *Buffer,\r
;    IN UINTN  Count\r
;    )\r
;------------------------------------------------------------------------------\r
InternalMemZeroMem  PROC    USES    rdi\r
    mov     rdi, rcx\r
    xor     rcx, rcx\r
    xor     eax, eax\r
    sub     rcx, rdi\r
    and     rcx, 15\r
    mov     r8, rdi\r
    jz      @F\r
    cmp     rcx, rdx\r
    cmova   rcx, rdx\r
    sub     rdx, rcx\r
    rep     stosb\r
@@:\r
    mov     rcx, rdx\r
    and     edx, 15\r
    shr     rcx, 4\r
    jz      @ZeroBytes\r
    pxor    xmm0, xmm0\r
@@:\r
    movntdq [rdi], xmm0                 ; rdi should be 16-byte aligned\r
    add     rdi, 16\r
    loop    @B\r
    mfence\r
@ZeroBytes:\r
    mov     ecx, edx\r
    rep     stosb\r
    mov     rax, r8\r
    ret\r
InternalMemZeroMem  ENDP\r
\r
    END\r