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