SimOS

SimOS was a full system simulator, developed in the Stanford University in the late nineties in the research group of Mendel Rosenblum.[1] It was enabled to run IRIX 5.3 on MIPS, and Unix variants on Alpha. [2]

## Contents

* 1 Derivatives
* 1.1 SimOS-PPC
* 1.2 Linux/SimOS
* 1.3 SimBCM
* 2 Similar products
* 2.1 Simics
* 2.2 RSIM
* 3 Notes and references

## Derivatives

### SimOS-PPC

SimOS-PPC was forked from the original SimOS as IBM's internal project, running a modified AIX kernel and userland in an emulator, developed by Tom Keller and his team in the Austin lab of IBM.[3] IBM used SimOS to facilitate development of new systems. The software used in this project is now publicly available for download for AIX 4.3 licensees.[4]

### Linux/SimOS

Linux/SimOS was "...a Linux operating system port to SimOS, which is a complete machine simulator from Stanford. The motivation for Linux/SimOS is to alleviate the limitations of SimOS, which only supports proprietary operating systems."[5]

### SimBCM

SimBCM is an open source full system simulator based on SimOS. It simulates BCM1250, a dual-core MIPS64 SOC of Broadcom. The entire source code of SimBCM is distributed under GPL.[6] It is capable of running the Linux kernel or the NICTA::Pistachio L4 microkernel.

## Similar products

### Simics

The currently available commercial product, Virtutech Simics was derived from the work of the Swedish Institute of Computer Science, and was originally developed to run a full system simulation of Solaris on SPARC platform.[7] Simics was used by IBM to help develop AIX 6.1 on a simulation of the POWER6 hardware.[8]

### RSIM

RSIM was the "Rice Simulator for ILP Multiprocessors", developed at the Rice University in the late 1990s. It was able to run on Solaris, IRIX and HP-UX. The simulator is available under the University of Illinois/NCSA Open Source License agreement. The development is finished.[9]

M5 Developed at the University of Michigan, M5 simulates Alpha and SPARC hardware, with support for other architectures in progress. [10]

## Notes and references

1. ↑ "VMware Leadership". Vmware.com. http://www.vmware.com/company/leadership.html. Retrieved 2011-12-16.
2. ↑ "SimOS project page at Stanford". Archived from the original on August 24, 2005. https://web.archive.org/web/20050824123339/http://simos.stanford.edu/. Retrieved 2014-07-24.
3. ↑ SimOS–PPC - Full System Simulation of PowerPC Architecture (Tom Keller, 1999)
4. ↑ IBM Austin Research Laboratory - SimOS-PPC Software Archive
5. ↑ Linux MIPS emulators - SimOS
6. ↑ SimBCM project page
7. ↑ Simics
8. ↑ Virtutech Simics Optimizes Product Development of System P Server Product Line
9. ↑ The RSIM project

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