RISC-V 从这里开始

Posted 2023-04-02

参考技术A RISC-V：读作risk-five，是一个开源的CPU指令集架构

zephyr：开源操作系统

linux：没什么好说的。

risc-pk：The RISC-V Proxy Kernel。解释如下：is a lightweight application execution environment that can host statically-linked RISC-V ELF binaries.  It is designed to support tethered RISC-V implementations with limited I/O capability and and thus handles I/O-related system calls by proxying them to a host computer.

BBL ：the Berkeley Boot Loader。

linux相关开源基础库对RISC-V的支持

binutils: upstreamed (2.28 is the first release with RISC-V support)

gcc: upstreamed (7.1 is the first release with RISC-V support)

glibc: upstreamed (2.27 is the first release with RISC-V support)

linux kernel: upstreamed (the architecture core code went into

kernel 4.15; kernel 4.19 contains all drivers necessary for booting a

simulated system to userland)

gdb: upstreamed in master (in the release process)

qemu: upstreamed (2.12 is the first release with RISC-V support)

tinyriscv---一个从零开始写的极简易懂的开源RISC-V处理器核

本项目实现的是一个微riscv处理器核(tinyriscv)，用verilog语言编写，只求以最简单、最通俗易懂的方式实现riscv指令的功能，因此没有特意去对代码做任何的优化，因此你会看到里面写的代码有很多冗余的地方。tinyriscv处理器核有以下特点：

1)实现了RV32I指令集，通过riscv的RV32I指令兼容性测试，支持以下指令：add addi and andi auipc beq bge bgeu blt bltu bne fence_i jal jalr lb lbu lh lhu lw lui or ori sb sh sw sll slli slt slti sltiu sltu sra srai srl srli sub xor xori；

2)采用三级流水线，即取指，译码、访存、执行，回写；

3)可以运行简单的c语言程序；

 

详细内容和源码见  码云：https://gitee.com/liangkangnan/tinyriscv