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[[!meta copyright="Copyright © 2005, 2007, 2008, 2009, 2010 Free Software
Foundation, Inc."]]
[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
id="license" text="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
is included in the section entitled [[GNU Free Documentation
License|/fdl]]."]]"""]]
QEMU is free software written by Fabrice Bellard that implements a fast
processor [[emulator|emulation]], allowing a user to run one operating system
within another one. It is similar to projects such as [[Bochs]] and VMware
Workstation, but has several features these lack, including increased speed and
support for multiple architectures. By using dynamic translation it achieves a
reasonable speed while being easy to port on new host CPUs.
QEMU has two operating modes:
* User mode emulation: QEMU can launch Linux processes compiled for one CPU
on another CPU. Linux [[system call]]s are converted because of endianness
and 32/64 bit mismatches. Wine and Dosemu are the main targets for QEMU.
* System mode emulation: QEMU emulates a full system, including a processor
and various peripherials. It enables easier testing and debugging of
system code. It can also be used to provide virtual hosting of several
virtual PCs on a single server.
The majority of the program is under the [[LGPL]], with the system mode
emulation under the [[GPL]].
# External Links
* <http://www.nongnu.org/qemu/>
* [Qemu on Windows](http://www.h7.dion.ne.jp/~qemu-win/)
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