Chapter 27. Pentium® II Power Management Features

The Previous Chapter

This chapter provided an overview of the Pentium® II processor's hardware design characteristics. This included:

• The Pentium® Pro/Pentium® II Differences.

• One Product Yields Three Product Lines.

• The Pentium® II/Xeon/Celeron Roadmap.

• The Cartridge.

• The Core.

• The FSB and BSB.

• The Introduction of the Celeron.

This Chapter

This chapter provides a detailed description of the power management modes found in all IA32 processors starting with the Pentium® II processor. Note that the Pentium® M processor added one additional mode, Deeper Sleep, and a description can be found in “Enhanced Power Management Characteristics” on page 1429.

The Next Chapter

This chapter provides a detailed description of the software enhancements first implemented in the Pentium® II processor. This discussion is directly applicable to all subsequent IA32 processors. This includes:

• The Pentium® II and Pentium® III MSRs.

• The Fast System Call/Return Instruction Pair.

• The FP/SSE Save/Restore Instruction Pair.

• New/Altered Exceptions.