1;------------------------------------------------------------------------------ 2; 3; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR> 4; SPDX-License-Identifier: BSD-2-Clause-Patent 5; 6; Module Name: 7; 8; SetMem32.nasm 9; 10; Abstract: 11; 12; SetMem32 function 13; 14; Notes: 15; 16;------------------------------------------------------------------------------ 17 18 DEFAULT REL 19 SECTION .text 20 21;------------------------------------------------------------------------------ 22; VOID * 23; InternalMemSetMem32 ( 24; IN VOID *Buffer, 25; IN UINTN Count, 26; IN UINT32 Value 27; ) 28;------------------------------------------------------------------------------ 29global ASM_PFX(InternalMemSetMem32) 30ASM_PFX(InternalMemSetMem32): 31 DB 0x49, 0xf, 0x6e, 0xc0 ; movd mm0, r8 (Value) 32 mov rax, rcx ; rax <- Buffer 33 xchg rcx, rdx ; rcx <- Count rdx <- Buffer 34 shr rcx, 1 ; rcx <- # of qwords to set 35 jz @SetDwords 36 DB 0xf, 0x70, 0xC0, 0x44 ; pshufw mm0, mm0, 44h 37.0: 38 DB 0xf, 0xe7, 0x2 ; movntq [rdx], mm0 39 lea rdx, [rdx + 8] ; use "lea" to avoid flag changes 40 loop .0 41 mfence 42@SetDwords: 43 jnc .1 44 DB 0xf, 0x7e, 0x2 ; movd [rdx], mm0 45.1: 46 ret 47 48