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Welcome to the RISC-V Port Project!

RISC-V is the a free and open-source RISC instruction set architecture developed by the RISC-V Foundation. (ISA) designed originally at the University of California, Berkeley, and now

developed collaboratively under the sponsorship of RISC-V International. It is already supported by a wide range of language toolchains.

With the increasing availability of RISC-V hardware, a port of the JDK would be valuable. RISC-V ISA is actually a family of related ISAs of which

there are currently four base ISAs [1]. Those base ISAs can be combined with a set of of standard extensions. RV64G and RV32G are defined as

general-purpose ISAs. RISC-V ISA needs a new OpenJDK port. 

We have ported JDK to a new platform: Linux/RISC-V. This port supports the following subsystems:

• The template interpreter
• The C1 (client) JIT compiler
• The C2 (server) JIT compiler
• All current mainline GCs, including Z and Shenandoah

Currently, this port only supports RV64GV, i.e., RV64G ISA plus the "V" standard extension for vector operations. In the future, this port may support other ISA variants like RV32G depending on community interestsupports the RV64G configuration of RISC-V, which is the general-purpose 64-bit RISC-V ISA.

In addition, we have experimental support for RVV, RVC, Zba and Zbb RISC-V ISA-extentions. These features need to be explicitly enabled respectively

through: -XX:+UseRVV, -XX:+UseRVC, -XX:+UseZba and -XX:+UseZbb JVM options. In the future we may consider supporting other RISC-V configurations such as,

for example, a general-purpose 32-bit configuration (RV32G).

We are building nightlies here [2]. Hotspot disassember is also available [3]. And we've provided build instructions for reference [34]. You can try the RISC-V V JDK

with QEMU User/System mode or hardwares like HiFive Unleashed/Unmatched board.

Have fun and happy hacking 

[1] https://github.com/riscv/riscv-isa-manual

[2] https://builds.shipilev.net/openjdk-jdk-riscv

[3] http://cr.openjdk.java.net/~fyang/hsdis/hsdis-riscv64.so

[4] http://cr.openjdk.java.net/~fyang/openjdk-riscv-port/BuildRISCVJDK.md

Project structure

• master branch - synced automatically with the master branch of openjdk/jdk
• riscv-port branch - for normal riscv-port project development purpose

Resources

• RISC-V Port Project
• Repository
• Mailing list: riscv-port-dev (archives)