The seL4 microkernel
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AdrianDanis arm: Use TCB version of TPIDRUR[OW] state
These registers are part of the 'regular' TCB state and are saved and restored as part
of normal thread switching. As such it is conflicting to have a duplicate idea of the value
of these registers, especially as it is not kept in sync with the version in the TCB,
which is what is actually being loaded into the hardware.
Latest commit 723aa0e Jul 5, 2018

The seL4 Repository

This repository contains the source code of seL4 microkernel.

For details about the seL4 microkernel, including details about its formal correctness proof, please see the website and associated FAQ.

DOIs for citing recent releases of this repository:

  • DOI

We welcome contributions to seL4. Please see the website for information on how to contribute.

This repository is usually not used in isolation, but as part of the build system in a larger project.


A hosted version of the manual for the most recent release can be found here.

Repository Overview

  • include and src: C and ASM source code of seL4
  • tools: build tools
  • libsel4: C bindings for the seL4 ABI
  • manual: LaTeX sources of the seL4 reference manual

Build Instructions

See the seL4 website for build instructions.


The files in this repository are released under standard open source licenses. Please see the individual file headers and LICENSE_GPLv2.txt and LICENSE_BSD2.txt files for details.