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@Ravduct on Wheat Operating System (WheatOS)

47m 55s logged

Trying to switch CPU mode in bootloader

I’m currently working on the bootloader to make it from Real Mode (16-bit) to Protected Mode (32-bit)

I’m still stuck with the A20 gate. I need to learn more about Assembly syntax, so it will help me understand how my CPU actually works.

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Comments 5

@scrt401

You can ask bios directly to open a20 gate for you

@scrt401

Or you can use PS2 port to take out the mask and modify it and put it back troug it

@scrt401

Take out byte from 0x92, put it to some lower section of some register like al then use or al, 2 to modify the mask without corrupting the other masks and then put it back to 0x92

@scrt401

I used both to be sure

@Ravduct

@scrt401 I am actually stuck on the transition from Real Mode to Protected Mode, not only the A20 gate.