NJU-ProjectN/nemu ics2023 initialized

NJU-ProjectN/nemu eb63cf3568dbf4e0c3c6ef462e6ec685550fabbc Merge pull request #76 from rijuyuezhu/master

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