The Unabridged Pentium 4 IA32 Processor Genealogy

Chapter 61. The Local and IO APICs

The Previous Chapter

This chapter provided a detailed description of System Management Mode (SMM). It included:

• What Falls Under the Heading of System Management?

• The Genesis of SMM.

• SMM Has Its Own Private Memory Space.

• The Basic Elements of SMM.

• How the Processor Knows the SM Memory Start Address.

• The Organization of SM RAM.

• Entering SMM.

• Exiting SMM.

• The Auto Halt Restart Feature.

• The IO Instruction Restart Feature.

• Caching from SM Memory.

• Setting Up the SMI Handler in SM Memory.

• Relocating the SM RAM Base Address.

• SMM in an MP System.

This Chapter

This chapter provides a complete description of the Local and IO APICs. It includes:

• Message Transfer Mechanism Prior to the Pentium® 4.

• Message Transfer Mechanism Starting ...