[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibMmx / X64 / SetMem32.nasm

;------------------------------------------------------------------------------\r
;\r
; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.<BR>\r
; SPDX-License-Identifier: BSD-2-Clause-Patent\r
;\r
; Module Name:\r
;\r
;   SetMem32.nasm\r
;\r
; Abstract:\r
;\r
;   SetMem32 function\r
;\r
; Notes:\r
;\r
;------------------------------------------------------------------------------\r
\r
    DEFAULT REL\r
    SECTION .text\r
\r
;------------------------------------------------------------------------------\r
;  VOID *\r
;  InternalMemSetMem32 (\r
;    IN VOID   *Buffer,\r
;    IN UINTN  Count,\r
;    IN UINT32 Value\r
;    )\r
;------------------------------------------------------------------------------\r
global ASM_PFX(InternalMemSetMem32)\r
ASM_PFX(InternalMemSetMem32):\r
    movq    mm0, r8\r
    mov     rax, rcx                    ; rax <- Buffer\r
    xchg    rcx, rdx                    ; rcx <- Count  rdx <- Buffer\r
    shr     rcx, 1                      ; rcx <- # of qwords to set\r
    jz      @SetDwords\r
    pshufw  mm0, mm0, 44h\r
.0:\r
    movntq  [rdx], mm0\r
    lea     rdx, [rdx + 8]              ; use "lea" to avoid flag changes\r
    loop    .0\r
    mfence\r
@SetDwords:\r
    jnc     .1\r
    movd    [rdx], mm0\r
.1:\r
    ret\r
\r
Commit	Line	Data
	1	;------------------------------------------------------------------------------\r
	2	;\r
	3	; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.<BR>\r
	4	; SPDX-License-Identifier: BSD-2-Clause-Patent\r
	5	;\r
	6	; Module Name:\r
	7	;\r
	8	; SetMem32.nasm\r
	9	;\r
	10	; Abstract:\r
	11	;\r
	12	; SetMem32 function\r
	13	;\r
	14	; Notes:\r
	15	;\r
	16	;------------------------------------------------------------------------------\r
	17	\r
	18	DEFAULT REL\r
	19	SECTION .text\r
	20	\r
	21	;------------------------------------------------------------------------------\r
	22	; VOID *\r
	23	; InternalMemSetMem32 (\r
	24	; IN VOID *Buffer,\r
	25	; IN UINTN Count,\r
	26	; IN UINT32 Value\r
	27	; )\r
	28	;------------------------------------------------------------------------------\r
	29	global ASM_PFX(InternalMemSetMem32)\r
	30	ASM_PFX(InternalMemSetMem32):\r
	31	movq mm0, r8\r
	32	mov rax, rcx ; rax <- Buffer\r
	33	xchg rcx, rdx ; rcx <- Count rdx <- Buffer\r
	34	shr rcx, 1 ; rcx <- # of qwords to set\r
	35	jz @SetDwords\r
	36	pshufw mm0, mm0, 44h\r
	37	.0:\r
	38	movntq [rdx], mm0\r
	39	lea rdx, [rdx + 8] ; use "lea" to avoid flag changes\r
	40	loop .0\r
	41	mfence\r
	42	@SetDwords:\r
	43	jnc .1\r
	44	movd [rdx], mm0\r
	45	.1:\r
	46	ret\r
	47	\r