Category "osdev"

Purpose of bitwise operation in this example

In the function outb(0x3D5, (uint8_t) (pos & 0xFF));, I am having trouble understanding the purpose of the bitwise operation. pos is a uint16_t variable. Wh

Failing to write to video memory in 32 bit mode

I have been researching and writing a bootloader. In order to switch to 32 bit mode I used this tutorial: https://www.youtube.com/watch?v=pXzortxPZR8&list=P

How to switch from 32-bit to PAE paging directly?

I'm developing a microkernel for my personal research. I have chosen to run my kernel at 0xf0000000, leaving 3.75 GiB for user space programs. When my kernel st

How to update GDT entries after initial loading?

Once I initialize and load my GDT into the GDTR using lgdt, how can I update the GDT later? Am I correct if I use the sgdt command to get the base address and t

Makefile won't compile anything other than "kernel.c"

I've been trying to compile an OS however whenever I attempt to compile it using the make file it only compiles "kernel.c" and I can't seem to figure out why. I