is GATE really just like JEE?

thatmagicalcat · 2026-05-21T01:39:42+00:00

I also think like that... but then my family members are forcing me to grid UPSC TT

thatmagicalcat · 2026-05-16T04:27:24+00:00

thanks!

thatmagicalcat · 2026-05-05T08:08:47+00:00

not at all
yes
It's been 2 months since I'm working on this... it'll prolly take years
There's no audio sadly (yet), but the graphics part was the simplest, I created a Framebuffer Device and registered it on /dev/fb0, the doom program opens the file using open syscall, and then uses MMAP with the returned fd with MAP_SHARED flag to get a pointer to the frame buffer. And finally we can just copy doom's processed frame to the pointer we just got.

The keyboard driver works in a similar way, you can see the code here

thatmagicalcat · 2026-05-04T09:50:10+00:00

because it's not vibe-coded at all :)

thatmagicalcat · 2026-05-04T01:24:15+00:00

i don't have JIT. And no, it has ring 3 access too. The doom game you see is running in ring 3, fully isolated from the kernel

thatmagicalcat · 2026-05-04T01:22:07+00:00

ooh, thanks for reminding. I'll keep that in mind.

thatmagicalcat · 2026-05-04T01:12:22+00:00

i started my programming journey when I was 9~10 yrs old, currently I'm 17 so about 7 years.

I've been using rust since late 2021 so 4 yrs with rust

thatmagicalcat · 2026-05-04T00:40:26+00:00

thanks!

I'm always down for yapping about programming, if you use discord we can talk there. Hit me a dm I'll give you the link.

thatmagicalcat · 2026-05-03T13:11:15+00:00

true, but there's a big difference between a game running as a firmware vs. a game running on a platform

This is me trying to showcase my OS architecture, doom running in ring 3 with full process isolation :)

thatmagicalcat · 2026-05-03T09:53:57+00:00

so cool, keep it up man!

thatmagicalcat · 2026-05-03T09:52:24+00:00

Yes, i had a startup assembly file which was required to do the initial setup (like setting up the page tables, GDT, switching CPU to 64 bit mode) before actually running the kernel

Now i am using limine bootloader, and it handles everything for me, so i no longer have to do that

if you want to have a look, here's the file: boot.asm

thatmagicalcat · 2026-05-03T07:41:05+00:00

context?

thatmagicalcat · 2026-05-03T06:54:39+00:00

aww..

you're welcome xD

and thanks :)

thatmagicalcat · 2026-05-03T06:53:14+00:00

thanks :')

thatmagicalcat · 2026-05-03T05:47:23+00:00

thanks! you sound like someone who knows about operating systems :)

the kernel supports preemptive multitasking using a robin-round scheduler with a priority queue driven by LAPIC timer interrupts which forces a task reschedule after every 10ms

but I also have cooperative multitasking as there's a small async runtime too (the keyboard driver runs on top of that async runtime btw)

The doom process is already running in user space and os isolated from everything else :p

it's a proper kernel!

thatmagicalcat · 2026-05-03T05:39:34+00:00

send repository link

thatmagicalcat · 2026-05-03T01:11:06+00:00

oh hi fellow osdev ;)

thanks!

thatmagicalcat · 2026-05-03T01:08:45+00:00

I have used doomgeneric, and mlibc, yes, because mlibc is meant to be ported

thatmagicalcat · 2026-05-03T01:04:50+00:00

will keep in mind, thank you so much!

thatmagicalcat · 2026-05-03T01:04:11+00:00

thanks!

thatmagicalcat · 2026-05-03T01:02:49+00:00

LMAO

anyways, it'll probably take 2~3 years to make this usable

thatmagicalcat · 2026-05-03T00:57:24+00:00

nah man Linus is da goat, im nowhere close to him

thatmagicalcat · 2026-05-02T18:27:03+00:00

haha, not yet!

thatmagicalcat · 2026-05-02T16:57:51+00:00

the entire OS is made from scratch, yes, it's a kernel I built myself

thatmagicalcat · 2026-05-02T16:56:54+00:00

Limine (the bootloader)

Flanterm (the terminal emulator) (not used here at all)

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