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qemu-doc: replace introduction with the one from the internals manual
The user manual has an obsolete introduction, and the one in the internals manual lists QEMU's features quite nicely. Drop the obsolete content and remove generic user-level documentation from qemu-tech. Reviewed-by: Emilio G. Cota <cota@braap.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini
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2 changed files with 44 additions and 128 deletions
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@ -57,65 +57,69 @@
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QEMU is a FAST! processor emulator using dynamic translation to
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achieve good emulation speed.
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@cindex operating modes
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QEMU has two operating modes:
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@itemize
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@cindex operating modes
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@item
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@cindex system emulation
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Full system emulation. In this mode, QEMU emulates a full system (for
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@item Full system emulation. In this mode, QEMU emulates a full system (for
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example a PC), including one or several processors and various
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peripherals. It can be used to launch different Operating Systems
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without rebooting the PC or to debug system code.
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@item
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@cindex user mode emulation
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User mode emulation. In this mode, QEMU can launch
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@item User mode emulation. In this mode, QEMU can launch
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processes compiled for one CPU on another CPU. It can be used to
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launch the Wine Windows API emulator (@url{http://www.winehq.org}) or
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to ease cross-compilation and cross-debugging.
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@end itemize
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QEMU can run without a host kernel driver and yet gives acceptable
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performance.
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QEMU has the following features:
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For system emulation, the following hardware targets are supported:
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@itemize
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@cindex emulated target systems
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@cindex supported target systems
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@item PC (x86 or x86_64 processor)
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@item ISA PC (old style PC without PCI bus)
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@item PREP (PowerPC processor)
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@item G3 Beige PowerMac (PowerPC processor)
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@item Mac99 PowerMac (PowerPC processor, in progress)
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@item Sun4m/Sun4c/Sun4d (32-bit Sparc processor)
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@item Sun4u/Sun4v (64-bit Sparc processor, in progress)
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@item Malta board (32-bit and 64-bit MIPS processors)
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@item MIPS Magnum (64-bit MIPS processor)
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@item ARM Integrator/CP (ARM)
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@item ARM Versatile baseboard (ARM)
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@item ARM RealView Emulation/Platform baseboard (ARM)
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@item Spitz, Akita, Borzoi, Terrier and Tosa PDAs (PXA270 processor)
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@item Luminary Micro LM3S811EVB (ARM Cortex-M3)
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@item Luminary Micro LM3S6965EVB (ARM Cortex-M3)
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@item Freescale MCF5208EVB (ColdFire V2).
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@item Arnewsh MCF5206 evaluation board (ColdFire V2).
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@item Palm Tungsten|E PDA (OMAP310 processor)
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@item N800 and N810 tablets (OMAP2420 processor)
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@item MusicPal (MV88W8618 ARM processor)
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@item Gumstix "Connex" and "Verdex" motherboards (PXA255/270).
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@item Siemens SX1 smartphone (OMAP310 processor)
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@item AXIS-Devboard88 (CRISv32 ETRAX-FS).
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@item Petalogix Spartan 3aDSP1800 MMU ref design (MicroBlaze).
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@item Avnet LX60/LX110/LX200 boards (Xtensa)
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@item QEMU can run without a host kernel driver and yet gives acceptable
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performance. It uses dynamic translation to native code for reasonable speed,
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with support for self-modifying code and precise exceptions.
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@item It is portable to several operating systems (GNU/Linux, *BSD, Mac OS X,
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Windows) and architectures.
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@item It performs accurate software emulation of the FPU.
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@end itemize
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QEMU user mode emulation has the following features:
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@itemize
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@item Generic Linux system call converter, including most ioctls.
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@item clone() emulation using native CPU clone() to use Linux scheduler for threads.
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@item Accurate signal handling by remapping host signals to target signals.
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@end itemize
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QEMU full system emulation has the following features:
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@itemize
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@item
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QEMU uses a full software MMU for maximum portability.
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@item
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QEMU can optionally use an in-kernel accelerator, like kvm. The accelerators
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execute most of the guest code natively, while
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continuing to emulate the rest of the machine.
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@item
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Various hardware devices can be emulated and in some cases, host
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devices (e.g. serial and parallel ports, USB, drives) can be used
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transparently by the guest Operating System. Host device passthrough
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can be used for talking to external physical peripherals (e.g. a
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webcam, modem or tape drive).
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@item
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Symmetric multiprocessing (SMP) support. Currently, an in-kernel
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accelerator is required to use more than one host CPU for emulation.
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@end itemize
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@cindex supported user mode targets
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For user emulation, x86 (32 and 64 bit), PowerPC (32 and 64 bit),
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ARM, MIPS (32 bit only), Sparc (32 and 64 bit),
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Alpha, ColdFire(m68k), CRISv32 and MicroBlaze CPUs are supported.
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@node Installation
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@chapter Installation
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@ -41,7 +41,6 @@
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@chapter Introduction
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@menu
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* intro_features:: Features
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* intro_x86_emulation:: x86 and x86-64 emulation
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* intro_arm_emulation:: ARM emulation
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* intro_mips_emulation:: MIPS emulation
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@ -51,93 +50,6 @@
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* intro_other_emulation:: Other CPU emulation
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@end menu
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@node intro_features
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@section Features
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QEMU is a FAST! processor emulator using a portable dynamic
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translator.
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QEMU has two operating modes:
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@itemize @minus
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@item
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Full system emulation. In this mode (full platform virtualization),
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QEMU emulates a full system (usually a PC), including a processor and
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various peripherals. It can be used to launch several different
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Operating Systems at once without rebooting the host machine or to
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debug system code.
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@item
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User mode emulation. In this mode (application level virtualization),
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QEMU can launch processes compiled for one CPU on another CPU, however
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the Operating Systems must match. This can be used for example to ease
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cross-compilation and cross-debugging.
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@end itemize
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As QEMU requires no host kernel driver to run, it is very safe and
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easy to use.
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QEMU generic features:
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@itemize
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@item User space only or full system emulation.
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@item Using dynamic translation to native code for reasonable speed.
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@item
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Working on x86, x86_64 and PowerPC32/64 hosts. Being tested on ARM,
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S390x, Sparc32 and Sparc64.
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@item Self-modifying code support.
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@item Precise exceptions support.
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@item
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Floating point library supporting both full software emulation and
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native host FPU instructions.
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@end itemize
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QEMU user mode emulation features:
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@itemize
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@item Generic Linux system call converter, including most ioctls.
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@item clone() emulation using native CPU clone() to use Linux scheduler for threads.
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@item Accurate signal handling by remapping host signals to target signals.
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@end itemize
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Linux user emulator (Linux host only) can be used to launch the Wine
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Windows API emulator (@url{http://www.winehq.org}). A BSD user emulator for BSD
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hosts is under development. It would also be possible to develop a
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similar user emulator for Solaris.
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QEMU full system emulation features:
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@itemize
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@item
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QEMU uses a full software MMU for maximum portability.
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@item
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QEMU can optionally use an in-kernel accelerator, like kvm. The accelerators
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execute some of the guest code natively, while
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continuing to emulate the rest of the machine.
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@item
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Various hardware devices can be emulated and in some cases, host
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devices (e.g. serial and parallel ports, USB, drives) can be used
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transparently by the guest Operating System. Host device passthrough
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can be used for talking to external physical peripherals (e.g. a
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webcam, modem or tape drive).
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@item
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Symmetric multiprocessing (SMP) even on a host with a single CPU. On a
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SMP host system, QEMU can use only one CPU fully due to difficulty in
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implementing atomic memory accesses efficiently.
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@end itemize
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@node intro_x86_emulation
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@section x86 and x86-64 emulation
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