2.2.3 x86 Memory Management

  • Real Address Mode
    • 1Mb of memory addressed (0x00000 to 0xFFFFF)
    • Only one program can be run at a time
    • Interrupts allow scheduling
    • Programs can access any location
  • Protected Mode
    • 4Gb of memory can be addressed
    • Each program has 4Gb of virtual memory
  • Virutal 8086
    • Runs in protected mode with 1Mb of memory
    • Simulating a virtual 8086 machine

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