OPIO-1技術問題億佳詢
內中斷步驟
內中斷步驟與外中斷基本相同,每個內中斷源有自己的中斷向量。所不同的是因為中斷源在處理機內部,所以不必請求總線控制權,就可發送中斷向量。
(8)係統對同時發生的內中斷,外中斷統一按如下優先次序服務:
在處理“指令內中斷”、“跟蹤內中斷”、“堆棧溢出內中斷”或“總線錯誤內中斷”時又出現總線錯誤,處理機只能立即停機。
在處理“指令內中斷”、“總線錯誤內中斷”或“跟蹤內中斷”的過程中出現“堆棧溢出”,處理過程被完成。然後處理堆棧溢出。在處理堆棧溢出時,在中斷隱指令中仍有兩次壓堆棧的操作會引起堆棧進一步溢出,在處理機內已採取措施避免因此而引起死循環。
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