target/loongarch: Add system emulation introduction
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn> Signed-off-by: Song Gao <gaosong@loongson.cn> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220606124333.2060567-19-yangxiaojuan@loongson.cn> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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Xiaojuan Yang
Richard Henderson
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@ -1122,6 +1122,14 @@ F: include/hw/net/lasi_82596.h
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F: include/hw/pci-host/dino.h
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F: pc-bios/hppa-firmware.img
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LoongArch Machines
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------------------
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Virt
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M: Xiaojuan Yang <yangxiaojuan@loongson.cn>
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M: Song Gao <gaosong@loongson.cn>
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S: Maintained
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F: docs/system/loongarch/loongson3.rst
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M68K Machines
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-------------
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an5206
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@ -0,0 +1,41 @@
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:orphan:
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==========================================
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loongson3 virt generic platform (``virt``)
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==========================================
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The ``virt`` machine use gpex host bridge, and there are some
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emulated devices on virt board, such as loongson7a RTC device,
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IOAPIC device, ACPI device and so on.
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Supported devices
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-----------------
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The ``virt`` machine supports:
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- Gpex host bridge
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- Ls7a RTC device
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- Ls7a IOAPIC device
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- Ls7a ACPI device
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- Fw_cfg device
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- PCI/PCIe devices
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- Memory device
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- CPU device. Type: Loongson-3A5000.
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CPU and machine Type
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--------------------
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The ``qemu-system-loongarch64`` provides emulation for virt
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machine. You can specify the machine type ``virt`` and
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cpu type ``Loongson-3A5000``.
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Boot options
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------------
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Now the ``virt`` machine can run test program in ELF format and the
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method of compiling is in target/loongarch/README.
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.. code-block:: bash
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$ qemu-system-loongarch64 -machine virt -m 4G -cpu Loongson-3A5000 \
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-smp 1 -kernel hello -monitor none -display none \
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-chardev file,path=hello.out,id=output -serial chardev:output
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@ -8,3 +8,57 @@
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We can get the latest loongarch documents at https://github.com/loongson/LoongArch-Documentation/tags.
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- System emulation
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Mainly emulate a virt 3A5000 board and ls7a bridge that is not exactly the same as the host.
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3A5000 support multiple interrupt cascading while here we just emulate the extioi interrupt
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cascading. LS7A1000 host bridge support multiple devices, such as sata, gmac, uart, rtc
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and so on. But we just realize the rtc. Others use the qemu common devices. It does not affect
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the general use. We also introduced the emulation of devices at docs/system/loongarch/loongson3.rst.
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This version only supports running binary files in ELF format, and does not depend on BIOS and kernel file.
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You can compile the test program with 'make & make check-tcg' and run the test case with the following command:
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1. Install LoongArch cross-tools on X86 machines.
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Download cross-tools.
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wget https://github.com/loongson/build-tools/releases/latest/download/loongarch64-clfs-20211202-cross-tools.tar.xz
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tar -vxf loongarch64-clfs-20211202-cross-tools.tar.xz -C /opt
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Config cross-tools env.
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. setenv.sh
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setenv.sh:
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#!/bin/sh
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set -x
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CC_PREFIX=/opt/cross-tools
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export PATH=$CC_PREFIX/bin:$PATH
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export LD_LIBRARY_PATH=$CC_PREFIX/lib:$LD_LIBRARY_PATH
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export LD_LIBRARY_PATH=$CC_PREFIX/loongarch64-unknown-linux-gnu/lib/:$LD_LIBRARY_PATH
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set +x
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2. Test tests/tcg/multiarch.
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./configure --disable-rdma --disable-pvrdma --prefix=/usr \
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--target-list="loongarch64-softmmu" \
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--disable-libiscsi --disable-libnfs --disable-libpmem \
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--disable-glusterfs --enable-libusb --enable-usb-redir \
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--disable-opengl --disable-xen --enable-spice --disable-werror \
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--enable-debug --disable-capstone --disable-kvm --enable-profiler
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cd build/
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make && make check-tcg
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or
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./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
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- Note.
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We can get the latest LoongArch documents or LoongArch tools at https://github.com/loongson/
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