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NEMU

NEMU(NJU Emulator) is a simple but complete full-system emulator designed for teaching purpose. Currently it supports x86, mips32, and riscv32. To build programs run above NEMU, refer to the AM project.

The main features of NEMU include

  • a small monitor with a simple debugger
    • single step
    • register/memory examination
    • expression evaluation without the support of symbols
    • watch point
    • differential testing with reference design (e.g. QEMU)
    • snapshot
  • CPU core with support of most common used instructions
    • x86
      • real mode is not supported
      • x87 floating point instructions are not supported
    • mips32
      • CP1 floating point instructions are not supported
    • riscv32
      • only RV32IM
  • memory
  • paging
    • TLB is optional (but necessary for mips32)
    • protection is not supported
  • interrupt and exception
    • protection is not supported
  • 5 devices
    • Args Rom, serial, timer, keyboard, VGA
    • most of them are simplified and unprogrammable
  • 2 types of I/O
    • port-mapped I/O and memory-mapped I/O