---
title: FreeBSD Architecture Handbook
authors:
  - author: The FreeBSD Documentation Project
copyright: 2000-2006, 2012-2023 The FreeBSD Documentation Project
description: For FreeBSD system developers. This book covers the architectural details of many important FreeBSD kernel subsystems
trademarks: ["freebsd", "apple", "microsoft", "unix", "general"]
tags: ["Arch Handbook", "FreeBSD"]
add_split_page_link: true
---

= FreeBSD Architecture Handbook
:doctype: book
:toc: macro
:toclevels: 2
:icons: font
:sectnums:
:sectnumlevels: 6
:partnums:
:source-highlighter: rouge
:experimental:
:book: true
:pdf: false

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[.abstract-title]
Abstract

Welcome to the FreeBSD Architecture Handbook. This manual is a _work in progress_ and is the work of many individuals. Many sections do not yet exist and some of those that do exist need to be updated. If you are interested in helping with this project, send email to the {freebsd-doc}.

The latest version of this document is always available from the link:https://www.FreeBSD.org/[FreeBSD World Wide Web server]. It may also be downloaded in a variety of formats and compression options from the https://download.freebsd.org/doc/[FreeBSD download server] or one of the numerous extref:{handbook}mirrors[mirror sites, mirrors].

'''

toc::[]

// Section one
include::{chapters-path}parti.adoc[]
include::{chapters-path}boot/_index.adoc[leveloffset=+1]
include::{chapters-path}locking/_index.adoc[leveloffset=+1]
include::{chapters-path}kobj/_index.adoc[leveloffset=+1]
include::{chapters-path}jail/_index.adoc[leveloffset=+1]
include::{chapters-path}sysinit/_index.adoc[leveloffset=+1]]
include::{chapters-path}mac/_index.adoc[leveloffset=+1]
include::{chapters-path}vm/_index.adoc[leveloffset=+1]
include::{chapters-path}smp/_index.adoc[leveloffset=+1]

// Section two
include::{chapters-path}partii.adoc[]
include::{chapters-path}driverbasics/_index.adoc[leveloffset=+1]
include::{chapters-path}isa/_index.adoc[leveloffset=+1]
include::{chapters-path}pci/_index.adoc[leveloffset=+1]
include::{chapters-path}scsi/_index.adoc[leveloffset=+1]
include::{chapters-path}usb/_index.adoc[leveloffset=+1]
include::{chapters-path}newbus/_index.adoc[leveloffset=+1]
include::{chapters-path}sound/_index.adoc[leveloffset=+1]
include::{chapters-path}pccard/_index.adoc[leveloffset=+1]

// Section three
include::{chapters-path}partiii.adoc[]
include::{chapters-path}bibliography/_index.adoc[leveloffset=+1]
