ysyx-workbench/nemu/README.md

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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, riscv32 and riscv64.
To build programs run above NEMU, refer to the [AM project](https://github.com/NJU-ProjectN/abstract-machine).
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
* riscv64
* only RV64IM
* memory
* paging
* TLB is optional (but necessary for mips32)
* protection is not supported
* interrupt and exception
* protection is not supported
* 5 devices
* serial, timer, keyboard, VGA, audio
* most of them are simplified and unprogrammable
* 2 types of I/O
* port-mapped I/O and memory-mapped I/O