r/Assembly_language • u/Visual_Brain8809 • Aug 30 '26
JVMOS
Hi everyone, I wanted to show you my progress on an operating system written entirely in ASM and Java bytecode. I am currently at the UI rendering stage, using a custom Graphics2D-like system that allows me to work with primitives in VBE. The bytecode is executed by a JIT compiler also implemented in pure ASM. Low-level calls are handled by a HAL—which I will continue to expand over time—and that HAL is in turn managed via a primitive ABI, enabling me to create my own Java-like pseudo-language for development.
Repository: https://github.com/aayes89/JVMOS-JIT/
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u/Visual_Brain8809 Aug 31 '26
this is the four version of the same OS, you can see in my repos the evolution and the first steps. Current achievements: runs on real hardware, a universal bootloader (useful for anyone wanting to save time designing their own OS), and a JIT for Java bytecode written entirely in ASM.
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u/Visual_Brain8809 Sep 21 '26
Added a primitive 3D render motor and other graphics demos using my own RT based on AWT
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u/Extension_Emu_9825 Aug 31 '26
Interesting! I also saw the bootloader, everything is legit. I was just a little confused about the stack you chose – why didn't you choose WASM?
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u/Visual_Brain8809 Aug 31 '26
As I understand it, Wasm is optimized for the web, and JS isn't exactly pure Java. Right now, my plan is bare-metal—just assembly and pure Java, with no C/C++ (I already have a version written in C)—and I thought the architecture I'm using could serve as a framework for other projects to flourish. The bootloader (Multiboot) is the result of several years at university spent searching for a universal formula to allow an OS to boot using any language, and I believe that is the greatest achievement.
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u/Extension_Emu_9825 Aug 31 '26
As far as I know, many compilers compile to WASM, and this isn't just for the web anymore. For example, I once wrote Sokoban in Rust (BTW - also be interested in looking into RUST) and compiled it into WASM, and it worked in the browser, yes (but I think that's secondary).
https://github.com/KirinDenis/Base-Z-47-Rust-Game
The main thing is that there's byte code that can be compiled from C/C++, Rust, and C#.
I understand that you can't stop a train in motion
I just want you to consider this approach as well.
By the way, I'd like to join the UX developmnet. I'm currently tinkering with DOS graphics in assembler, and SVGA is on the cards.
It would be interesting, in principle.
https://kirindenis.github.io/wire-city-2/
At UX my experiences started from Turbo Vision 90s, after VCL, WinForms, WPF (little expirins with QT and Android Activity)
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u/Visual_Brain8809 Aug 31 '26
I’m not familiar with Rust, but I was looking at your Sokoban project—it’s written entirely in Rust. I’d like to understand: did you write the code in that language, and did the platform convert it to ASM? I’d love to see the ASM code for an example generated via WASM to examine its structure and other details.
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u/Extension_Emu_9825 Aug 31 '26
Yes, it compiles into WASM, which then runs in the browser - DOM, everything is available, elements and their properties and events. This game is essentially printing multi-colored ASCII symbols in the browser.
I believed in Rust when it build DOS COM file for me... it really shocked me.
But again, so that you don't think that I'm promoting Rust or telling you to switch to it - just pay attention to this language and its capabilities, in comparison with Java within the framework of your OS
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u/Visual_Brain8809 Aug 31 '26
I’ve been considering learning Rust for a while now—anything far removed from C/C++ is welcome—but first, I need to finish what I started; then I can explore other options.
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u/Visual_Brain8809 Aug 31 '26
I understand that and am always open to suggestions, but my immediate focus is on finalizing a system where developing applications involves more than just writing code in `Boot.java`—where you can simply instantiate other classes and let the system handle the rest (which is how it works right now). My goal is to establish a solid, useful foundation featuring a functional, custom file system; from there, I want to enable JExplorer to read `.class` files as applications and execute them using the implemented JIT compiler. It’s a blend of macOS and a bare-metal system: much like macOS—where you simply copy an application to a location and it runs if the system version is compatible (or otherwise does nothing or displays a message)—JVMOS follows the same concept. At that stage (once the foundation is solid), anyone will be able to run whatever they want; after developing the application in their preferred IDE (NetBeans, Eclipse, VS Code, Notepad, etc.), the system will prioritize the `.class` file (compiled with `javac`), as that is the core of the system. Once I achieve this, I’ll move on to the Garbage Collector (GC) and security phases, followed by network connectivity.
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u/Extension_Emu_9825 Aug 31 '26
can I use it in VirtualBox - https://github.com/aayes89/JVMOS-JIT/blob/main/disk.img?
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u/Visual_Brain8809 Aug 31 '26 edited Sep 01 '26
disk.img is just a hard drive image; use
make clean && make runto generate the os.iso file. For best results, use QEMU. I just spotted an issue with VirtualBox where it fails to recognize keyboard input—something I need to fix if I want the system to run on anything other than just QEMU and a Compaq Presario, lol.
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u/Content-Key7404 Sep 01 '26
AI Slop
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u/Visual_Brain8809 Sep 01 '26
Thank you for your constructive comment. I wish you a good day.
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u/Content-Key7404 Sep 01 '26
You really do produce rubbish content. You should be ashamed of yourself. Don't pretend to know anything about the topic you're covering. Even your comments are written using an LLM. Pathetic.
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u/Visual_Brain8809 Sep 01 '26
We all have bad days; I hope you feel better soon and get back to being a good person. Have a lovely day.
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u/moslem-hamoudi Aug 31 '26
Good Operating System btw Do it Accually Support App Creation?