PPT Slide
An OS creates a virtual computer for each program, with each it’s own:
- Process(es) (TDM)
- Address space(s) (SDM)
- Disk objects/file system (SDM)
The illusion is complete: Figure 1.3
Each virtual component has it’s own rules:
- Figure 1.4: Virtual Processor
- Some native real processor instructions are masked; new “instructions” are added (aka system calls)
- Pvirtual = Pphysical - {Priv. Instr} + {Useful Instr}