Add A20 check, enable code, and exception handling. - Githubissues

IlanVinograd / OS_32Bit

32 Bit Operation System

GNU General Public License v3.0

3 stars 1 forks source link

Add A20 check, enable code, and exception handling. #8

Closed IlanVinograd closed 1 month ago

IlanVinograd commented 1 month ago

This commit introduces functionality for checking and enabling the A20 line in a 16-bit environment. It includes:

A20 status check mechanism using memory comparison.
BIOS interrupt 0x15 to enable A20 if found disabled.
Error handling with messages for A20 enabling failure.
Success handling with a message for successful A20 enabling.
Restoration of the system registers and flags after handling A20 status.

These changes ensure proper system functioning in preparation for transitioning to protected mode.