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: Restriction of addressable domain. 可寻址域的约束 Type checking. 类型检验 6.4.1 Page-Table Entries Hold Protection Parameters页表项保存保护参数 Figure 6-10 highlights the fields of…

从上一次学习MIT的操作系统课程又过去了一年.上次学习并没有坚持下去.想来虽有种种原因,其还在自身无法坚持罢了.故此次再鼓起勇气重新学习,发现课程都已由2014改版为2016了.但大部分内容并没有改变.在这一年多的时间里,也曾学习过其他课程,比如孟宁的Linux内核分析,也看过其他人写的文章.但还是有很多内容无法全部理解,而且从网上文章或讨论中也看出,象我这种似懂非懂的状态很多人都有.比如,在看到linux0.11中的那个TSS结构时就一直在想,为什么要这样设计呀?系统明明没有使用到那么多结构成…

Intel 80386 Reference Programmer's Manual 80386程序员参考手册 Chapter 1 -- Introduction to the 80386 第1章 - 80386的介绍 The 80386 is an advanced 32-bit microprocessor optimized for multitasking operating systems and designed for applications needing very high p…

2.1 Memory Organization and Segmentation 内存组织和分段 The physical memory of an 80386 system is organized as a sequence of 8-bit bytes. Each byte is assigned a unique address that ranges from zero to a maximum of 2^(32) -1 (4 gigabytes). 80386系统的物理内存被看做8位…

6.3 Segment-Level Protection 段级保护 All five aspects of protection apply to segment translation: 段转换时会提供以下5个方面的保护: Type checking 类型检验 Limit checking 限长检验 Restriction of addressable domain 可寻址域的限定 Restriction of procedure entry points 程序入口点的限定 Restricti…

5.2 Page Translation 页转换 In the second phase of address transformation, the 80386 transforms a linear address into a physical address. This phase of address transformation implements the basic features needed for page-oriented virtual-memory systems…

10.2 Software Initialization for Real-Address Mode   实地址模式的软件初始化 In real-address mode a few structures must be initialized before a program can take advantage of all the features available in this mode. 在实地址模式,程序在能利用这个模式下的的所有可用特性之前,新架构必须被初始化. 10.2.1…

5.3 Combining Segment and Page Translation  联合使用段与分页转换 Figure 5-12 combines Figure 5-2 and Figure 5-9 to summarize both phases of the transformation from a logical address to a physical address when paging is enabled. By appropriate choice of options…

注:觉得本章内容与理解操作系统不直接相关,所以本章并未看完,也就没有翻译完,放在这里中是为了保证手册的完整.有兴趣的人可以去原址查看. https://pdos.csail.mit.edu/6.828/2016/readings/i386/c03.htm Chapter 3 Applications Instruction Set 程序指令集 This chapter presents an overview of the instructions which programmers can u…

2.6 Interrupts and Exceptions 中断和异常 The 80386 has two mechanisms for interrupting program execution: 80386对中断处理执行有两个机制: Exceptions are synchronous events that are the responses of the CPU to certain conditions detected during the execution of an inst…