1- Introduction 2 3 LoongArch is the general processor architecture of Loongson. 4 5 The following versions of the LoongArch core are supported 6 core: 3A5000 7 https://github.com/loongson/LoongArch-Documentation/releases/download/2021.08.17/LoongArch-Vol1-v1.00-EN.pdf 8 9 We can get the latest loongarch documents at https://github.com/loongson/LoongArch-Documentation/tags. 10 11 12- System emulation 13 14 Mainly emulate a virt 3A5000 board and ls7a bridge that is not exactly the same as the host. 15 3A5000 support multiple interrupt cascading while here we just emulate the extioi interrupt 16 cascading. LS7A1000 host bridge support multiple devices, such as sata, gmac, uart, rtc 17 and so on. But we just realize the rtc. Others use the qemu common devices. It does not affect 18 the general use. We also introduced the emulation of devices at docs/system/loongarch/loongson3.rst. 19 20 This version only supports running binary files in ELF format, and does not depend on BIOS and kernel file. 21 You can compile the test program with 'make & make check-tcg' and run the test case with the following command: 22 23 1. Install LoongArch cross-tools on X86 machines. 24 25 Download cross-tools. 26 27 wget https://github.com/loongson/build-tools/releases/latest/download/loongarch64-clfs-20211202-cross-tools.tar.xz 28 29 tar -vxf loongarch64-clfs-20211202-cross-tools.tar.xz -C /opt 30 31 Config cross-tools env. 32 33 . setenv.sh 34 35 setenv.sh: 36 37 #!/bin/sh 38 set -x 39 CC_PREFIX=/opt/cross-tools 40 41 export PATH=$CC_PREFIX/bin:$PATH 42 export LD_LIBRARY_PATH=$CC_PREFIX/lib:$LD_LIBRARY_PATH 43 export LD_LIBRARY_PATH=$CC_PREFIX/loongarch64-unknown-linux-gnu/lib/:$LD_LIBRARY_PATH 44 set +x 45 46 2. Test tests/tcg/multiarch. 47 48 ./configure --disable-rdma --disable-pvrdma --prefix=/usr \ 49 --target-list="loongarch64-softmmu" \ 50 --disable-libiscsi --disable-libnfs --disable-libpmem \ 51 --disable-glusterfs --enable-libusb --enable-usb-redir \ 52 --disable-opengl --disable-xen --enable-spice --disable-werror \ 53 --enable-debug --disable-capstone --disable-kvm --enable-profiler 54 55 cd build/ 56 57 make && make check-tcg 58 59 or 60 61 ./build/qemu-system-loongarch64 -machine virt -m 4G -cpu Loongson-3A5000 -smp 1 -kernel build/tests/tcg/loongarch64-softmmu/hello -monitor none -display none -chardev file,path=hello.out,id=output -serial chardev:output 62 63- Note. 64 We can get the latest LoongArch documents or LoongArch tools at https://github.com/loongson/ 65