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Version 14 (modified by Jiri Svoboda, 12 years ago) (diff)

Release Notes for HelenOS Trunk

Note: This document is a draft describing a future HelenOS release and is subject to change. The software described here has not been released yet. To get these latest and greatest features now, check out our SVN trunk. (But you will also get the latest bugs).

HelenOS version was released on date.

Features Introduced in This Release


  • Multilingual text support
    • HelenOS now uses UCS as its primary representation for characters and UTF-8 as the primary string encoding, both in kernel and in user space. (With UTF-32 as an alternative for some special internal purposes).
  • New string API
    • The kernel and user space use a new (non-standard) string API which allows convenient processing of UTF-8 strings.

Services and Drivers

  • Device mapper
  • kbd has been rewritten and modularized. It supports three layouts (US QWERTY, US Dvorak and Czech QWERTZ).
  • Console
  • rd now uses an abstract block device interface.
  • Added gxe_bd for GXemul disk device.
  • Added ata_bd for ATA disks simulated in Qemu.
  • Added file_bd block device backed by a file.

File systems

  • Support for multiple file systems mounted at once.
  • Support for stat() and fstat() file system calls.
  • The file system block cache will write back blocks to the device, it still does not flush the cache periodically though.
  • tmpfs now supports multiple instances (#35)
  • Added devfs file system for handling access to console via a file handle.


  • Tester
    • tester is controlled by command-line arguments rather than being interactive.
  • Tetris
    • tetris now uses colors.
    • Score table is now persistent.
  • Bdsh
    • Support for simple mv command.
    • Support for simple mount command.
  • New applications
    • getvc


  • Build system
    • Preconfigured defaults greatly simplify the process of configuring a HelenOS build.

Regressions in This Release

  • Support for mips32 malta machine
    • Support for the Simics model of the mips32 malta machine has been removed due to code cleanup.
  • Mouse support on ia32 and amd64
    • Mouse support was temporarily removed from the i8042 driver due to code cleanup. A new mouse driver will be reintroduced in a near future release.

Known Bugs