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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

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)