The Unabridged Pentium 4 IA32 Processor Genealogy

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Chapter 6. Protected Mode Introduction

The Previous Chapter

This chapter provided a detailed description of the processor's operation when in Real Mode. This description also applies to all IA32 processors subsequent to the 386 processor.

This Chapter

This chapter provides a basic introduction to the following topics: Segmentation, Virtual Memory Paging, IO Protection, Privilege Levels, Virtual 8086 Mode, Task Switching and Interrupt Handling.

The Next Chapter

This chapter introduces segment register usage in Protected Mode, Segment Descriptors, the GDT, the LDTS, the IDT, and the general Segment Descriptor format.

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