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Chapter 9 Exceptions and Interrupts 第9章 异常和中断 Interrupts and exceptions are special kinds of control transfer; they work somewhat like unprogrammed CA 阅读全文
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8.2 I/O Instructions I/O指令 The I/O instructions of the 80386 provide access to the processor's I/O ports for the transfer of data to and from peripher 阅读全文
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Chapter 8 Input/Output 输入/输出 This chapter presents the I/O features of the 80386 from the following perspectives: 本章从以下方面来介绍80386的I/O特性: Methods of ad 阅读全文
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7.7 Task Address Space 任务地址空间 The LDT selector and PDBR fields of the TSS give software systems designers flexibility in utilization of segment and pa 阅读全文
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7.6 Task Linking 任务链 The back-link field of the TSS and the NT (nested task) bit of the flag word together allow the 80386 to automatically return to 阅读全文
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7.5 Task Switching 任务切换 The 80386 switches execution to another task in any of four cases: 80386在以下四种情况下会切换另一个任务去执行： 当前任务执行了一个引用了TSS描述符的JMP或CALL。 当前任务 阅读全文
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7.1 Task State Segment 任务状态段 All the information the processor needs in order to manage a task is stored in a special type of segment, a task state se 阅读全文
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Chapter 7 Multitasking 多任务 To provide efficient, protected multitasking, the 80386 employs several special data structures. It does not, however, use 阅读全文
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6.5 Combining Page and Segment Protection 组合页与段保护 When paging is enabled, the 80386 first evaluates segment protection, then evaluates page protection 阅读全文
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6.4 Page-Level Protection 页级保护 Two kinds of protection are related to pages: 与页相关的保护有两类： 6.4.1 Page-Table Entries Hold Protection Parameters页表项保存保护参数 阅读全文