Loongson-3 CPU family include Loongson-3A R1/R2/R3/R4 and Loongson-3B R1/R2. Loongson-3A R1 is the oldest and its ISA is the smallest, while Loongson-3A R4 is the newest and its ISA is almost the superset of all others. To reduce complexity, in QEMU we just define two CPU types:
1, "Loongson-3A1000" CPU which is corresponding to Loongson-3A R1. It is suitable for TCG because Loongson-3A R1 has fewest ASE. 2, "Loongson-3A4000" CPU which is corresponding to Loongson-3A R4. It is suitable for KVM because Loongson-3A R4 has the VZ ASE. Loongson-3 lacks English documents. I've tried to translated them with translate.google.com, and the machine translated documents (together with their original Chinese versions) are available here. Loongson-3A R1 (Loongson-3A1000) User Manual Part 1: http://ftp.godson.ac.cn/lemote/3A1000_p1.pdf http://ftp.godson.ac.cn/lemote/Loongson3A1000_processor_user_manual_P1.pdf (Chinese Version) User Manual Part 2: http://ftp.godson.ac.cn/lemote/3A1000_p2.pdf http://ftp.godson.ac.cn/lemote/Loongson3A1000_processor_user_manual_P2.pdf (Chinese Version) Loongson-3A R2 (Loongson-3A2000) User Manual Part 1: http://ftp.godson.ac.cn/lemote/3A2000_p1.pdf http://ftp.godson.ac.cn/lemote/Loongson3A2000_user1.pdf (Chinese Version) User Manual Part 2: http://ftp.godson.ac.cn/lemote/3A2000_p2.pdf http://ftp.godson.ac.cn/lemote/Loongson3A2000_user2.pdf (Chinese Version) Loongson-3A R3 (Loongson-3A3000) User Manual Part 1: http://ftp.godson.ac.cn/lemote/3A3000_p1.pdf http://ftp.godson.ac.cn/lemote/Loongson3A3000_3B3000usermanual1.pdf (Chinese Version) User Manual Part 2: http://ftp.godson.ac.cn/lemote/3A3000_p2.pdf http://ftp.godson.ac.cn/lemote/Loongson3A3000_3B3000usermanual2.pdf (Chinese Version) Loongson-3A R4 (Loongson-3A4000) User Manual Part 1: http://ftp.godson.ac.cn/lemote/3A4000_p1.pdf http://ftp.godson.ac.cn/lemote/3A4000user.pdf (Chinese Version) User Manual Part 2: I'm sorry that it is unavailable now. We are preparing to add QEMU's Loongson-3 support. MIPS VZ extension is fully supported in Loongson-3A R4+, so we at first add QEMU/KVM support in this series. And the next series will add QEMU/TCG support (it will emulate Loongson-3A R1). We already have a full functional Linux kernel (based on Linux-5.4.x LTS but not upstream yet) here: https://github.com/chenhuacai/linux How to use QEMU/Loongson-3? 1, Download kernel source from the above URL; 2, Build a kernel with arch/mips/configs/loongson3_{def,hpc}config; 3, Boot a Loongson-3A4000 host with this kernel; 4, Build QEMU-5.0.0 with this patchset; 5, modprobe kvm; 6, Use QEMU with TCG (available in future): qemu-system-mips64el -M loongson3-virt,accel=tcg -cpu Loongson-3A1000 -kernel <path_to_kernel> -append ... Use QEMU with KVM (available at present): qemu-system-mips64el -M loongson3-virt,accel=kvm -cpu Loongson-3A4000 -kernel <path_to_kernel> -append ... The "-cpu" parameter is optional here and QEMU will use the correct type for TCG/KVM automatically. V1 -> V2: 1, Add a cover letter; 2, Improve CPU definitions; 3, Remove LS7A-related things (Use GPEX instead); 4, Add a description of how to run QEMU/Loongson-3. V2 -> V3: 1, Fix all possible checkpatch.pl errors and warnings. V3 -> V4: 1, Sync code with upstream; 2, Remove merged patches; 3, Fix build failure without CONFIG_KVM; 4, Add Reviewed-by: Aleksandar Markovic <aleksandar.qemu.de...@gmail.com>. V4 -> V5: 1, Improve coding style; 2, Remove merged patches; 3, Rename machine name from "loongson3" to "loongson3-virt"; 4, Rework the "loongson3-virt" machine to drop any ISA things; 5, Rework "hw/mips: Implement the kvm_type() hook in MachineClass"; 6, Add Jiaxun Yang as a reviewer of Loongson-3. Huacai Chen(4): hw/mips: Implement the kvm_type() hook in MachineClass hw/intc: Add Loongson liointc support hw/mips: Add Loongson-3 machine support (with KVM) MAINTAINERS: Add Loongson-3 maintainer and reviewer Signed-off-by: Huacai Chen <che...@lemote.com> --- MAINTAINERS | 6 + default-configs/mips64el-softmmu.mak | 1 + hw/intc/Kconfig | 3 + hw/intc/Makefile.objs | 1 + hw/intc/loongson_liointc.c | 246 +++++++++ hw/mips/Kconfig | 11 + hw/mips/Makefile.objs | 1 + hw/mips/loongson3_virt.c | 969 +++++++++++++++++++++++++++++++++++ target/mips/kvm.c | 20 + target/mips/kvm_mips.h | 11 + 10 files changed, 1269 insertions(+) create mode 100644 hw/intc/loongson_liointc.c create mode 100644 hw/mips/loongson3_virt.c -- 2.7.0
