Cycle level full system simulator based performance evaluation has been indispensable to increasingly complex System-on-Chip designs.Although x86 processors have been the most ubiquitous processors in both commercial and science computing world

there is a scarcity of open source simulators that enable academic researchers to experiment with new x86 microprocessor based designs.This paper presents a cycle level full system simulator for PKUnity-86 System-on-Chip platform

which is based on Geode GX x86 processor and AMBA bus architecture.PKUsim-86 can boot up Microsoft DOS

Windows 98

Windows XP and run common x86 applications.On-the-fly switching between the functional simulation and performance simulation mode is supported.PKUsim-86 executes 0.86 million simulated instructions per second on average.Compared with real machines

the relative accuracy of PKUsim-86 is acceptable.