mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-27 16:58:09 +01:00
66 lines
2.0 KiB
NASM
66 lines
2.0 KiB
NASM
;------------------------------------------------------------------------------
|
|
;
|
|
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
;
|
|
; Module Name:
|
|
;
|
|
; SetMem.nasm
|
|
;
|
|
; Abstract:
|
|
;
|
|
; SetMem function
|
|
;
|
|
; Notes:
|
|
;
|
|
;------------------------------------------------------------------------------
|
|
|
|
DEFAULT REL
|
|
SECTION .text
|
|
|
|
;------------------------------------------------------------------------------
|
|
; VOID *
|
|
; InternalMemSetMem(
|
|
; IN VOID *Buffer,
|
|
; IN UINTN Count,
|
|
; IN UINT8 Value
|
|
; )
|
|
;------------------------------------------------------------------------------
|
|
global ASM_PFX(InternalMemSetMem)
|
|
ASM_PFX(InternalMemSetMem):
|
|
push rdi
|
|
mov rdi, rcx ; rdi <- Buffer
|
|
mov al, r8b ; al <- Value
|
|
mov r9, rdi ; r9 <- Buffer as return value
|
|
xor rcx, rcx
|
|
sub rcx, rdi
|
|
and rcx, 15 ; rcx + rdi aligns on 16-byte boundary
|
|
jz .0
|
|
cmp rcx, rdx
|
|
cmova rcx, rdx
|
|
sub rdx, rcx
|
|
rep stosb
|
|
.0:
|
|
mov rcx, rdx
|
|
and rdx, 15
|
|
shr rcx, 4
|
|
jz @SetBytes
|
|
mov ah, al ; ax <- Value repeats twice
|
|
movdqa [rsp + 0x10], xmm0 ; save xmm0
|
|
movd xmm0, eax ; xmm0[0..16] <- Value repeats twice
|
|
pshuflw xmm0, xmm0, 0 ; xmm0[0..63] <- Value repeats 8 times
|
|
movlhps xmm0, xmm0 ; xmm0 <- Value repeats 16 times
|
|
.1:
|
|
movntdq [rdi], xmm0 ; rdi should be 16-byte aligned
|
|
add rdi, 16
|
|
loop .1
|
|
mfence
|
|
movdqa xmm0, [rsp + 0x10] ; restore xmm0
|
|
@SetBytes:
|
|
mov ecx, edx ; high 32 bits of rcx are always zero
|
|
rep stosb
|
|
mov rax, r9 ; rax <- Return value
|
|
pop rdi
|
|
ret
|
|
|