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NonTrivialMIPS

NonTrivial-MIPS is a synthesizable superscalar MIPS processor with branch prediction and CP1 (FPU), CP2 (AES accelerator) support, and it is capable of booting fully-functional Linux.

Authors

See AUTHORS for information about the authors of this project.

Directory Structure

  • loongson: files from Loongson, some are adapted
    • cpu_gs232: RTL code of GS232 CPU (not included for copyright reason), packaged as Vivado IP
    • soc_axi_func: Vivado project, RTL code and testbench of functional test (using NonTrivialMIPS CPU)
    • soc_axi_perf: Vivado project, RTL code and testbench of performance test (using NonTrivialMIPS CPU)
    • soc_run_os: Vivado project and RTL code of a whole SoC (using GS232 CPU, upgraded to 2018.3)
    • soft: RAM initialization files used by the projects above
  • src: RTL code of NonTrivialMIPS CPU
  • vivado: Vivado project and block design of NSCSCC SoC
  • testbench: Testbenches of NonTrivialMIPS CPU / NSCSCC Soc
  • report: Design reports (LaTeX srouce code and rendered PDF)

Remark: out-of-order branch contains a toy dual-issue out-of-order processor.

Build Project

Update submodules

We use git submodules to manage external code. Run git submodule update --init after cloning this project to ensure everything is up-to-date.

Compiling options

NonTrivialMIPS CPU has some compiling flags that can control the features that will be enabled and parameters (such as cache size and associativity) that will be used. See src/compile_options.svh for details.

Note that inappropriate changes made to these flags may lead to strange or WRONG behaviors of the CPU.

Generate bitstream

You can generate bitstreams that can be programmed to FPGA by following commands:

# for soc project
/path/to/vivado -mode tcl -source scripts/build_soc.tcl vivado/TrivialMIPS.xpr
# for loongson functional test
/path/to/vivado -mode tcl -source scripts/generate_bitstream.tcl loongson/soc_axi_func/run_vivado/mycpu_prj1/mycpu.xpr
# for loongson performance test
/path/to/vivado -mode tcl -source scripts/generate_bitstream.tcl loongson/soc_axi_perf/run_vivado/mycpu_prj1/mycpu.xpr

Vivado 2018.3 is required.

License

All source code under src/ is released under the MIT License with the following exceptions:

Other directories might contain source code or materials that are proprietary or subject to open source licenses and kept in this repository as-is. Should you use these contents, you are aware that you will bear any corresponding legal responsibility or consequences.