Chapter 10 Initialization

After a signal on the RESET pin, certain registers of the 80386 are set to predefined values. These values are adequate to enable execution of a bootstrap program, but additional initialization must be performed by software before all the features of the processor can be utilized.

• 10.1 Processor State After Reset
• 10.2 Software Initialization for Real-Address Mode
• 10.2.1 Stack
• 10.2.2 Interrupt Table
• 10.2.3 First Instructions
• 10.3 Switching to Protected Mode
• 10.4 Software Initialization for Protected Mode
• 10.4.1 Interrupt Descriptor Table
• 10.4.2 Stack
• 10.4.3 Global Descriptor Table
• 10.4.4 Page Tables
• 10.4.5 First Task
• 10.5 Initialization Example
• 10.6 TLB Testing
• 10.6.1 Structure of the TLB
• 10.6.2 Test Registers
• 10.6.3 Test Operations

• Figure 10-1. Contents of EDX after RESET
• Figure 10-2. Initial Contents of CR0
• Figure 10-3. TLB Structure
• Figure 10-4. Test Registers

• Table 10-1. Meaning of D, U, and W Bit Pairs