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Protected Mode Transition — Firmware & Boot Process — LowLevelCraft

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Firmware & Boot Process
Protected Mode Transition

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Protected Mode Transition

Learn to switch x86 CPU from real mode to protected mode, enabling 32-bit operation, memory protection, and access to all 4GB of memory.

~360 Minutes 8 Challenges

switch to protected mode tutorial

About this subtrack

Protected Mode Transition covers GDT, IDT, paging entry points, and the jump out of real mode.

Tasks (8)

Switch from Real Mode to Protected Mode and Display Text

Build a Flat GDT for Protected Mode

Set Up the Interrupt Descriptor Table in Protected Mode

Enable Basic Paging in Protected Mode

Run Real Mode Code with Virtual 8086 Mode

Enter Ring 3 (User Mode) from Ring 0

Transition from Protected Mode to Long Mode (x86_64)

Set Up the Task State Segment (TSS)