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@PeyTy PeyTy released this 29 Jul 13:19
· 1 commit to kawaii since this release
2025.7.29
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Learn about vigilant mode.

Welcome to the latest release of the Greentea OS

Greentea OS is an alpha-stage GPL3 desktop OS from scratch that boots on x64 UEFI devices, and runs existing software unmodified (currently supports .exe files). The goal is to create a fast, lightweight OS that competes in the operating system space.

This release transitions GTOS from the pre-alpha to the alpha stage. Keep in mind that this system is being created from scratch on our own custom foundations.

Demo: https://www.youtube.com/watch?v=vh-icbJuQgg

Source Code

Most of the code is currently located in the two repos: Tofita and Caramel. The code will be refactored and evenly distributed across the repos in the later releases.

  • Tofita Engine - custom kernel, made almost entirely in Hexa, provides a syscall interface that Caramel is using
  • Caramel Win32 Layer - implements win32 .dlls like kernel32.dll and user32.dll, a compatibility layer for PE32 programs

Notable Changes

  • This release features a huge compatibility milestone: Greentea OS is now capable of running some actual apps!
  • Currently verified to (mostly) work: Minesweeper (FOSS), Solitaire (FOSS), Calculator (FOSS), Spider (FOSS), Minesweeper (XP)

Improvements

  • Environment blocks initialization routines are heavily redesigned (required by Caramel compatibility layer)
  • New custom icons (some made with AI, some by our professional designer)
  • New wallpapers (mostly AI + further manual editing in the authoring tools)
  • New themes and general improvements to the theming engine (HDR-tone mapping for proper UX/UI foreground-background elements contrast, chromatic aberration, etc)
  • Lots and lots of API functions and syscalls
  • Hexa was further tuned to handle GTOS devs needs well
  • SMP (multicore) initial support (developed as a separate prototype, will be included and enabled by default in the upcoming releases)
  • GTFS filesystem internal drafts are mostly ready for the Proof-of-Concept implementation soon, eliminating current system's immutability nature

Stability

  • Nested (or often happening, like mouse quick move) interrupts are now handled properly without overriding each other
  • Lots of calling convention corrections for 32-bit software and libraries
  • PE32(+) loader fixes all currently known issues
  • UEFI bootloader improvements on the real HW (currently not all of the planned changes have been done - they will be included in the next releases); thanks to all testers!
    • It's recommended for the HW testers to wait for the next release which will include next-generation memory manager used by the bootloader, as current one does not support some modern hardware configurations (you may join testers/QA group here)
  • Automatic UI/API testing is being drafted but not yet implemented
  • GUI tweaks and fixes (join UX/UI group here)

Performance

  • Copying on screen is now done with so called movntdq by default
  • Differential mouse cursor rendering
  • We now always build everything with O3 (regressions are very uncommon due to Hexa)
  • Scheduler is now using higher frequency (optimal value derived from the benchmarks)
  • Bootloader optimizations

Tools

  • libgen updated with a fix to a memory issue
  • webui debugging tool completely redesigned

Mirror

Also download at https://t.me/greenteaos_official

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