P0911JW產(chǎn)品就億佳
中斷的利用
通過外中斷請求取得總線控制權(quán)的設備可以通過中斷處理機的現(xiàn)行程序，使處理機的全部功能為設備服務，利用整個指令系統(tǒng)操;縱數(shù)據(jù)和狀態(tài)寄存器。每個可以中斷處理機現(xiàn)行程序的設備在主存中有一對單元保存它的“中斷向量”。其中個字存放它的服務程序的起始地址。第2個字是處理程序所使用的處理機狀態(tài)字，通過正確地使用處理機狀態(tài)字，可以轉(zhuǎn)變處理機的程序態(tài)，改變所用的堆棧指示器，修改處理機的優(yōu)先級。
(6)外中斷步驟
在186機中下述中斷處理步驟是由硬件自動完成的：
①如果中斷優(yōu)先級系統(tǒng)許可，處理機批準在所有申請中斷的設備中，優(yōu)先級高的設備取得總線控制權(quán)。
②設備取得總線控制權(quán)，向處理機發(fā)出“中斷”命令，和它的服務程序的向量地址。向量地址和服務程序都是在核心態(tài)虛擬空間。中斷向量的個字是服務程序的首地址，中斷向量的第二個字(它的地址等于中斷向量地址+2)是該服務程序所用的處理機狀態(tài)字。
③處理機把現(xiàn)行處理機狀態(tài)字和程序計數(shù)器存人處理機內(nèi)的暫存寄存器。
④處理機從核心態(tài)虛擬空間取出新的程序計數(shù)器和狀態(tài)寄存器(中斷向量)。然后把老的程序狀態(tài)和程序計數(shù)器由新的程序狀態(tài)字15、14位所規(guī)定的堆棧。并且把老程序狀態(tài)字的現(xiàn)行程序狀態(tài)置人狀態(tài)字寄存器的13、12位。然后啟動服務程序。
這些操作，從處理機接受中斷命令，至開始執(zhí)行服務程序的條指令，所花的時間約為12微秒。這個時間是以整個過程中未發(fā)生直接傳送為前提的。
⑤中斷服務程序結(jié)束時，通過執(zhí)行“中斷返回”或“推遲跟蹤中斷返回”指令返回被中斷的程序。執(zhí)行上述命令的結(jié)果是從現(xiàn)行程序態(tài)堆棧中彈出兩個字裝人程序計數(shù)器和狀態(tài)字寄存器。

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