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The Linux Kernel documentation
This is the top level of the kernel’s documentaon tree. Kernel documentaon, like the kernel itself,
is very much a work in progress; that is especially true as we work to integrate our many scaered
documents into a coherent whole. Please note that improvements to the documentaon are
welcome; join the linux-doc list at vger.kernel.org if you want to help out.
Licensing documentation
The following describes the license of the Linux kernel source code (GPLv2), how to properly mark
the license of individual files in the source tree, as well as links to the full license text.
Linux kernel licensing rules
User-oriented documentation
The following manuals are wrien for users of the kernel — those who are trying to get it to work
opmally on a given system.
The Linux kernel user’s and administrator’s guide
The following is a collecon of user-oriented documents that have been added to the kernel over
me. There is, as yet, lile overall order or organizaon here — this material was not wrien to be a
single, coherent document! With luck things will improve quickly over me.
This inial secon contains overall informaon, including the README file describing the kernel as
a whole, documentaon on kernel parameters, etc.
Linux kernel release 5.x <http://kernel.org/>
These are the release notes for Linux version 5. Read them carefully, as they tell you what this is all
about, explain how to install the kernel, and what to do if something goes wrong.
What is Linux?
Linux is a clone of the operang system Unix, wrien from scratch by Linus Torvalds with
assistance from a loosely-knit team of hackers across the Net. It aims towards POSIX and Single
UNIX Specificaon compliance.
It has all the features you would expect in a modern fully-fledged Unix, including true
multasking, virtual memory, shared libraries, demand loading, shared copy-on-write
executables, proper memory management, and mulstack networking including IPv4 and IPv6.
It is distributed under the GNU General Public License v2 - see the accompanying COPYING file
for more details.
On what hardware does it run?
Although originally developed first for 32-bit x86-based PCs (386 or higher), today Linux also
runs on (at least) the Compaq Alpha AXP, Sun SPARC and UltraSPARC, Motorola 68000,
PowerPC, PowerPC64, ARM, Hitachi SuperH, Cell, IBM S/390, MIPS, HP PA-RISC, Intel IA-64,
DEC VAX, AMD x86-64 Xtensa, and ARC architectures.
Linux is easily portable to most general-purpose 32- or 64-bit architectures as long as they have
a paged memory management unit (PMMU) and a port of the GNU C compiler (gcc) (part of The
GNU Compiler Collecon, GCC). Linux has also been ported to a number of architectures
without a PMMU, although funconality is then obviously somewhat limited. Linux has also
been ported to itself. You can now run the kernel as a userspace applicaon - this is called
UserMode Linux (UML).
Documentation
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