FreeBSD内核如何在保护模式下管理IA32处理器

A guide to how the FreeBSD kernel manages the IA32 processors in Protected Mode
(c) 2004, Arne Vidstrom,
http://vidstrom.net
Version 1.0 : 2004-06-17
Table of contents
1. PREREQUISITE KNOWLEDGE....................................................................................2
2. INFORMATION SOURCES ..........................................................................................2
3. THE INTERRUPT DESCRIPTOR TABLE (IDT) ............................................................2
3.1 The IDT definition............................................................................................2
3.2 Setting entries in the IDT .................................................................................3
3.3 A look inside the IDT with KernView ..............................................................4
3.4 Making the IDT active .....................................................................................5
4. SYSCALL HANDLING ...............................................................................................6
4.1 The INT 0x80 interrupt handler.......................................................................6
4.2 Syscall dispatching...........................................................................................8
4.3 The copyin() function .....................................................................................10
5. THE GLOBAL DESCRIPTOR TABLE (GDT).............................................................12
5.1 The GDT definition ........................................................................................12
5.2 Setting up the descriptors in the GDT............................................................13
5.3 Making the GDT active..................................................................................16
5.4 A look inside the GDT with KernView...........................................................17
5.5 Segment selector values in an ordinary user mode program ........................21
6. TASK SWITCHING ..................................................................................................22
6.1 The cpu_switch() function..............................................................................22
7. VIRTUAL PAGING ..................................................................................................29
7.1 The page fault handler ...................................................................................29
7.2 Virtual paging and task switching .................................................................32
8 THE LOCAL DESCRIPTOR TABLE (LDT).................................................................32
8.1 A quick glance at the LDT .............................................................................32
9. MISCELLANEOUS ..................................................................................................34

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