History of the FreeBSD/RISC-V Port

This page describes the history of the FreeBSD/RISC-V port, an adaptation of the FreeBSD Operating System to run on the RISC-V Instruction-Set Architecture (ISA). As a result of this work, FreeBSD is able to boot to multi-user mode on the Spike simulator and QEMU emulator. Following a number of commits to the FreeBSD subversion repository in January 2016 (see below), FreeBSD was the first operating system to have bootable in-tree support for RISC-V. This work was described in an EE Times article on the January 2016 RISC-V workshop. This work was supported by the DARPA CTSRD Project at the University of Cambridge Computer Laboratory and was led by RuslanBukin.

The FreeBSD Foundation posted a blog article describing the RISC-V porting effort and merge of architectural support to the FreeBSD base system in January 2016.

Source

This page contains some details about the FreeBSD/riscv64 development process. Now that RISC-V is an in-tree supported architecture this information is largely kept here for historical purposes.

Delivery into head:

Review

Commit

Description

D4445

r292124

kernel-toolchain

D4554

r292407

includes

D4679

r292691

rtld-elf

D4943

r294227

libc/libstand

D4982

r295041

kernel

D5014

r294571

xlint

D5020

r294573

jemalloc

D5021

r294577

compiler-rt

D5035

r294574

libunwind stubs

D5039

r294634

gcc config

D5040

r294662

libproc support

D5046

r294664

elftoolchain

D5048

r294665

usr.bin/ldd

D5064

r294908

libthread_db

D5063

r294912

libthr

D5178

r295253

reuse gp for pcpup

N/A

r295972

SMP support

N/A

r296614

DDB support

N/A

r303660

Privilege v1.9 update

N/A

r303908

Operation in machine mode removed

D8529

r308731

Full softfloat and hardfloat support

D11901

r322168

Compiler built-in macros changes

D11800

r322361

Support for privilege spec v1.10

N/A

335007

PLIC

N/A

338467

Make use of SSTATUS_SUM bit

People

Work on this project was performed by RuslanBukin, ArunThomas, and EdMaste, with RobertWatson, AndrewTurner, DavidChisnall, and others providing advice and moral support.

riscv/history (last edited 2020-02-05T22:35:27+0000 by MitchellHorne)