--- /dev/null
+;------------------------------------------------------------------------------\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.nasm\r
+;\r
+; Abstract:\r
+;\r
+; ZeroMem function\r
+;\r
+; Notes:\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+ DEFAULT REL\r
+ SECTION .text\r
+\r
+;------------------------------------------------------------------------------\r
+; VOID *\r
+; InternalMemZeroMem (\r
+; IN VOID *Buffer,\r
+; IN UINTN Count\r
+; );\r
+;------------------------------------------------------------------------------\r
+global ASM_PFX(InternalMemZeroMem)\r
+ASM_PFX(InternalMemZeroMem):\r
+ push rdi\r
+ mov rdi, rcx\r
+ mov rcx, rdx\r
+ mov r8, rdi\r
+ and edx, 7\r
+ shr rcx, 3\r
+ jz @ZeroBytes\r
+ DB 0xf, 0xef, 0xc0 ; pxor mm0, mm0\r
+.0:\r
+ DB 0xf, 0xe7, 7 ; movntq [rdi], mm0\r
+ add rdi, 8\r
+ loop .0\r
+ DB 0xf, 0xae, 0xf0 ; mfence\r
+@ZeroBytes:\r
+ xor eax, eax\r
+ mov ecx, edx\r
+ rep stosb\r
+ mov rax, r8\r
+ pop rdi\r
+ ret\r
+\r