intrlock.src

windows ce 3.00 嵌入式操作系统源代码

	.HEADING "Interlock memory operations"
	.FORM LINES=55
;++
;
; Copyright (c) 1995-2000 Microsoft Corporation.  All rights reserved.
;
; Module Name:
;
;    intrlock.src
;
; Abstract:
;
;    This module implements the InterlockedIncrement, I...Decrement,
; I...Exchange and I...TestExchange APIs.
;
;    WARNING: This module makes special use of register K1 to inform the
;	GeneralException handler in except.s that an interlocked operation
;	is being performed. Because the exception handler code has detailed
;	knowledge of this code, extreme care must be exercised when modifying
;	this module. For example, the store instruction must be followed
;	immediately by a "j ra" instruction.
;
; Environment:
;
;    Kernel mode or User mode.
;
; Revision History:
;
;--
	.include "ksshx.h"

	LEAF_ENTRY InterlockAPIs
	ALTERNATE_ENTRY _InterlockedExchange
	mov	#USER_KPAGE+h'3c0, r0
	jmp	@r0
	nop

	ALTERNATE_ENTRY _InterlockedTestExchange
	mov	#USER_KPAGE+h'3d0, r0
	jmp	@r0
	nop

	ALTERNATE_ENTRY _InterlockedIncrement
	mov	#USER_KPAGE+h'3e0, r0
	jmp	@r0
	nop

	ALTERNATE_ENTRY _InterlockedDecrement
	mov	#USER_KPAGE+h'3f0, r0
	jmp	@r0
	nop
	.endf

	.end