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 ;------------------------------------------------------------------------------ 35 global ASM_PFX(InternalMemSetMem32) 36 ASM_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
