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deepmind.google·6d ago
AI Engineering
Lobsters·Jul 3·5 min read
A Windows Kernel in a Browser Tab, Part I: Cold Boot, Fast Boot, and Four Megabytes
TL;DR
Existing emulators struggled to run a full 64-bit Windows kernel in a browser. A new kernel called nanokrnl was built using Rust, along with an emulator named nanox.
✦ Why It Matters
Engineers can explore running complex operating systems in browsers, enhancing accessibility and testing capabilities.
Key Takeaways
- Explore using nanokrnl for browser-based OS development.
- Consider WebAssembly for lightweight emulation solutions.
- Investigate memory optimization techniques for kernel design.
- Utilize Rust for building efficient system-level software.
Full Summary
Emulating a full 64-bit Windows kernel in a browser presented significant challenges, particularly due to the limitations of existing emulators. To address this, a new kernel named nanokrnl was developed in Rust, which operates in x86-64 long mode, utilizing advanced features like 4-level paging and local Advanced Programmable Interrupt Controller (APIC).
The accompanying emulator, nanox, is a compact 65 kilobytes of WebAssembly code that enables the kernel to run within a browser environment. Upon booting, the entire operating system reaches a command prompt while consuming only about four megabytes of memory.
This achievement demonstrates the feasibility of running complex operating systems in constrained environments like web browsers. The implications of this work could lead to more accessible development and testing environments for engineers and researchers.