isrepilog.s

zilog的实时操作系统RZK,可以移植到多种处理器上

;/*
;* File				:	ISREpilog.s
;*
;* Description		:	Defines ISR's epilog function
;* 
;* Copyright 2004 ZiLOG Inc.  ALL RIGHTS RESERVED.
;*
;* This file contains unpublished confidential and proprietary information
;* of ZiLOG, Inc.
;* NO PART OF THIS WORK MAY BE DUPLICATED, STORED, PUBLISHED OR DISCLOSED 
;* IN ANY FORM WITHOUT THE PRIOR WRITTEN CONSENT OF ZiLOG, INC.
;* This is not a license and no use of any kind of this work is authorized
;* in the absence of a written license granted by ZiLOG, Inc. in ZiLOG's 
;* sole discretion 
;*/
	.extern _RZKScheduler
	.extern _bTaskChangeFlag
	.extern _uNestedISRCount

	.def	_RZKISREpilog
	.assume	adl=1

;/* Function		:	_RZKISREpilog
;*
;* Description		:	Nested interrupt management and context switch decision
;*						making is done in this epilog function
;* Inputs			:	None.
;*							
;* Outputs			:	None.
;*							
;*
;* Dependencies		:	None.
;*/
_RZKISREpilog:
	LD HL, _RZKIsrReturn
	PUSH HL

	LD	A, (_uNestedISRCount)
	DEC	A

	LD	(_uNestedISRCount), A

	JP	NZ, ReturnFromISR

	LD	 HL,_RZKScheduler
	PUSH	HL

ReturnFromISR:
	RETI


_RZKIsrReturn:
	RET

	.def	_RZKISRProlog
_RZKISRProlog:
	LD	A, (_uNestedISRCount)
	INC	A
	LD	(_uNestedISRCount), A
	RET