PPT Slide

• Each virtual component has it’s own rules:

  • Figure 1.4: Virtual Processor (continued)
    • Separation of instruction privileges decided (hopefully!) by hardware states: system and user
    • Protected instructions are those which allow indiscriminate access to the hardware (address all of memory, access any I/O device, etc.)
  • Figure 1.5: Virtual Primary Memory
    • Create illusion that each program has it’s own private memory starting at address 0
  • Figure 1.6: Virtual I/O
    • Create illusion that each program has it’s own set of hardware devices

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