6.3.4 Gate Descriptors Guard Procedure Entry Points 门描述符守卫程序入口 To provide protection for control transfers among executable segments at different privilege levels, the 80386 uses gate descriptors. There are four kinds of gate descriptors: 为了在不同特权级别的可…

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…

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…

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…

10.3 Switching to Protected Mode  切换到保护模式 Setting the PE bit of the MSW in CR0 causes the 80386 to begin executing in protected mode. The current privilege level (CPL) starts at zero. The segment registers continue to point to the same linear address…

译注:一些异常没有翻译,因为看书时主要为了理解linux代码,所以代码中没有主要使用的就没有仔细看.这部分内容后期再看时再进行翻译. 9.8 Exception Conditions 异常条件 The following sections describe each of the possible exception conditions in detail. Each description classifies the exception as a fault, trap, or abort…

9.7 Error Code 错误代码 With exceptions that relate to a specific segment, the processor pushes an error code onto the stack of the exception handler (whether procedure or task). The error code has the format shown in Figure 9-7 . The format of the error…

9.6 Interrupt Tasks and Interrupt Procedures 中断任务和中断处理程序 Just as a CALL instruction can call either a procedure or a task, so an interrupt or exception can "call" an interrupt handler that is either a procedure or a task. When responding to an i…

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: The current task executes a JMP or CALL that refers to a TSS descriptor. 当前任务执行了一个引用了TSS描述符的JMP或CALL. The current task executes a JMP…