[mirror_edk2.git] / MdePkg / Library / BaseSynchronizationLib / Ia32 / InterlockedDecrement.nasm

;------------------------------------------------------------------------------\r
;\r
; Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
; SPDX-License-Identifier: BSD-2-Clause-Patent\r
;\r
; Module Name:\r
;\r
;   InterlockedDecrement.Asm\r
;\r
; Abstract:\r
;\r
;   InterlockedDecrement function\r
;\r
; Notes:\r
;\r
;------------------------------------------------------------------------------\r
\r
    SECTION .text\r
\r
;------------------------------------------------------------------------------\r
; UINT32\r
; EFIAPI\r
; InternalSyncDecrement (\r
;   IN      volatile UINT32           *Value\r
;   );\r
;------------------------------------------------------------------------------\r
global ASM_PFX(InternalSyncDecrement)\r
ASM_PFX(InternalSyncDecrement):\r
    mov       ecx, [esp + 4]\r
    mov       eax, 0FFFFFFFFh\r
    lock xadd dword [ecx], eax\r
    dec       eax\r
    ret\r
Commit	Line	Data
	1	;------------------------------------------------------------------------------\r
	2	;\r
	3	; Copyright (c) 2006 - 2018, 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	; InterlockedDecrement.Asm\r
	9	;\r
	10	; Abstract:\r
	11	;\r
	12	; InterlockedDecrement function\r
	13	;\r
	14	; Notes:\r
	15	;\r
	16	;------------------------------------------------------------------------------\r
	17	\r
	18	SECTION .text\r
	19	\r
	20	;------------------------------------------------------------------------------\r
	21	; UINT32\r
	22	; EFIAPI\r
	23	; InternalSyncDecrement (\r
	24	; IN volatile UINT32 *Value\r
	25	; );\r
	26	;------------------------------------------------------------------------------\r
	27	global ASM_PFX(InternalSyncDecrement)\r
	28	ASM_PFX(InternalSyncDecrement):\r
	29	mov ecx, [esp + 4]\r
	30	mov eax, 0FFFFFFFFh\r
	31	lock xadd dword [ecx], eax\r
	32	dec eax\r
	33	ret\r