1;------------------------------------------------------------------------------ 2; 3; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR> 4; 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; SetMem32.nasm 15; 16; Abstract: 17; 18; SetMem32 function 19; 20; Notes: 21; 22;------------------------------------------------------------------------------ 23 24 DEFAULT REL 25 SECTION .text 26 27;------------------------------------------------------------------------------ 28; VOID * 29; InternalMemSetMem32 ( 30; IN VOID *Buffer, 31; IN UINTN Count, 32; IN UINT32 Value 33; ) 34;------------------------------------------------------------------------------ 35global ASM_PFX(InternalMemSetMem32) 36ASM_PFX(InternalMemSetMem32): 37 DB 0x49, 0xf, 0x6e, 0xc0 ; movd mm0, r8 (Value) 38 mov rax, rcx ; rax <- Buffer 39 xchg rcx, rdx ; rcx <- Count rdx <- Buffer 40 shr rcx, 1 ; rcx <- # of qwords to set 41 jz @SetDwords 42 DB 0xf, 0x70, 0xC0, 0x44 ; pshufw mm0, mm0, 44h 43.0: 44 DB 0xf, 0xe7, 0x2 ; movntq [rdx], mm0 45 lea rdx, [rdx + 8] ; use "lea" to avoid flag changes 46 loop .0 47 mfence 48@SetDwords: 49 jnc .1 50 DB 0xf, 0x7e, 0x2 ; movd [rdx], mm0 51.1: 52 ret 53 54