[[!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/)