VMIVME-6015好貨億佳有
中斷的利用
通過外中斷請求取得總線控制權的設備可以通過中斷處理機的現行程序，使處理機的全部功能為設備服務，利用整個指令係統操;縱數據和狀態寄存器。每個可以中斷處理機現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字，通過正確地使用處理機狀態字，可以轉變處理機的程序態，改變所用的堆棧指示器，修改處理機的優先級。
(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：
如果中斷優先級係統許可，處理機批準在所有申請中斷的設備中，優先級高的設備取得總線控制權。
設備取得總線控制權，向處理機發出“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(它的地址等於中斷向量地址+2)是該服務程序所用的處理機狀態字。
處理機把現行處理機狀態字和程序計數器存人處理機內的暫存寄存器。
處理機從核心態虛擬空間取出新的程序計數器和狀態寄存器(中斷向量)。然後把老的程序狀態和程序計數器由新的程序狀態字15、14位所規定的堆棧。並且把老程序狀態字的現行程序狀態置人狀態字寄存器的13、12位。然後啟動服務程序。
這些操作，從處理機接受中斷命令，至開始執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生直接傳送為前提的。
中斷服務程序結束時，通過執行“中斷返回”或“推遲跟蹤中斷返回”指令返回被中斷的程序。執行上述命令的結果是從現行程序態堆棧中彈出兩個字裝人程序計數器和狀態字寄存器。
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