Clone this repo:
  1. 13ee3dc [sherlock][isp] Move ISP code out of MIPI CSI by Brijen Raval · 3 months ago master
  2. c1cc7f0 [vfs] Plumb a hash table around to track koids of tokens by George Kulakowski · 3 months ago
  3. 1d0fa40 [kernel] Check for nullptr after gfx_create_surface_from_display by Nick Maniscalco · 3 months ago
  4. 9407e8b [kernel] Typo fixes. by Bruce Mitchener · 3 months ago
  5. 119ba83 [kernel][object] Fix port/eport lock order violation by David Stevens · 3 months ago


Zircon is the core platform that powers the Fuchsia OS. Zircon is composed of a microkernel (source in kernel/...) as well as a small set of userspace services, drivers, and libraries (source in system/...) necessary for the system to boot, talk to hardware, load userspace processes and run them, etc. Fuchsia builds a much larger OS on top of this foundation.

The canonical Zircon Git repository is located at:

The Zircon Kernel provides syscalls to manage processes, threads, virtual memory, inter-process communication, waiting on object state changes, and locking (via futexes).

Currently there are some temporary syscalls that have been used for early bringup work, which will be going away in the future as the long term syscall API/ABI surface is finalized. The expectation is that there will be about 100 syscalls.

Zircon syscalls are generally non-blocking. The wait_one, wait_many port_wait and thread sleep being the notable exceptions.

This page is a non-comprehensive index of the zircon documentation.