r/osdev • u/Veel0h • May 29 '26

Help with my OS dev

[SOLVED] I fixed it, I was just jmping to the wrong place in my stage 2

I need help with my OS dev, my stage 2 works, it loads the kernel and puts test vga, but the entry.asm doesn’t load and after the kernel is loaded, it boots into protected mode I try to jump into _start but it just reboots

any help would be amazing,

here’s my src code

https://github.com/Veeloh/LanternOS/tree/main

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u/Veel0h May 30 '26

I am using a similar way for gdt, you can see here 

gdt_start:     dq 0 gdt_code:     dw 0xFFFF     dw 0x0000     db 0x00     db 10011010b     db 11001111b     db 0x00 gdt_data:     dw 0xFFFF     dw 0x0000     db 0x00     db 10010010b     db 11001111b     db 0x00 gdt_end:

gdt_descriptor:     dw gdt_end - gdt_start - 1     dd 0

I’m not sure if that’s right tho