Release Notes for HelenOS 0.7.0

HelenOS 0.7.0 (Parabolic Potassium) was released on April 4, 2017 and represents a major release with lots of new features and bug fixes.

This document contains a summary of changes made to HelenOS since release 0.6.0.

Special Notes for this Release

  • This release represents the first step in the planned switch to the more agile bi-annual release cycle. HelenOS is still an experimental operating system at this point in time and support for many platforms and hardware devices is not production-ready. For the time being, the agile bi-annual release cycle might therefore produce releases that are slightly less "polished" in certain aspects, but it is also a driving force towards turning HelenOS into a production-ready operating system in the near future.

Features Introduced in This Release


  • Improved support for the sun4u machines
  • Added basic support for user space paging
  • Many bugs discovered and removed thanks to verification tools
  • Improved dynamic linking
    • Dynamic linking is now enabled by default on ia32
  • Improved the IPC abstractions by introducing interface types


  • The SYS_TLS_SET syscall for configuring thread-local storage has been removed in favor of user space-driven TLS management

Services and Drivers

  • USB support revamped
    • Added support for USB 2.0
    • uhcirh driver removed as its functionality moved to uhci driver
  • Intel HD Audio recording support (experimental)
  • Completely new, unified partitioning architecture
    • Partitions are now enumerated automatically
    • fdisk utility replaces hdisk (vastly improved user experience, all changes are applied to running system state)

File Systems

  • Many ext4 improvements and bug fixes


  • Transport layer API was completely redesigned/reimplemented
    • Improved connection stability
    • No longer imitating BSD sockets
  • Added basic support for Wi-Fi (IEEE 802.11) network devices and authentication methods



  • libmath expanded to cover all C89 math functions (only generic/non-optimized implementation), including single-precision variants from C99
  • Optimizations of the heap memory allocator


  • XCW (Cross Compiler Wrapper) tools
    • Can be used by out-of-tree application to cross-compile for HelenOS
    • The application is written against native HelenOS (non-libposix) environment
    • The application's build system is aware it is cross-compiling for HelenOS

Regressions in This Release

  • Support for sparc32 machines (LEON3 CPU) has been removed due to the lack of proper maintenance (no hardware or easily accessible emulators avaiable)

Fixed Logged Bugs & Enhancements

  • For the list of all logged defects fixed in this release, see this report.
  • For the list of all logged enhancements integrated in this release, see this report.

Known Bugs

  • For the list of known bugs still not fixed in this release, see this report.
  • For the list of all open tickets, see this report.
Last modified 7 years ago Last modified on 2017-04-04T14:20:30Z
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